Towing systems and methods using magnetic field sensing

Description

BACKGROUND OF THE INVENTION
Field of Invention

The invention is related in general to systems and methods involving the use of magnetic field sensors and magneto-elastic devices for measuring a load and outputting a signal indicative of a load force dynamically applied to an object. The invention is also related to use of the force-sensing apparatus in connection with a vehicle-trailer hitch or tow coupling. The invention is also related to methods for determining a direction and magnitude of the force vector on the hitch or a particular hitch component.

Description of Related Art

Tow coupling devices are popular accessories for owners of passenger automobiles (cars and trucks) who tow trailers. These coupling devices may be purchased and installed in a new automobile, or purchased in the aftermarket and installed by owners after acquiring an automobile. The automotive and tow hitch industries classify trailer hitches according to various criteria. In one aspect, hitches are classified in one of Class 1-5. Each class of hitch includes associated real-world standards such as minimum force load requirements, including at least longitudinal tension, longitudinal compression, transverse thrust, vertical tension, and vertical compression.

In many trailer hitch use cases, strain gauges are used for sensing a force load on a hitch. Strain gauges, however, often require a structural weakening of the load-conducting elements. There is a need for load measurements without compromising the structural stability of the measuring device. This is especially true for tow couplings.

Furthermore, there is a strong demand for smart tow couplings, e.g., for systems providing at least the following: a load weight gauge (measuring the tongue load of a tow coupling), a tow load weight shift alert, an unsafe trailer load distribution alert, a vehicle limit notification, an automated trailer brake control (closed loop), a low/flat trailer tire notification, a check trailer brake notification, a closed loop braking control, a vehicle shift control, an engine control, and a stability control. These and other functions require the measurement of tow loads and/or tongue loads at the tow coupling.

Prior art load measurement devices for tow couplings have significant shortcomings, e.g. the complexity of the measurement and control devices, and the costs of the sensor assembly. Thus, there is a need for a tow coupling apparatus that may be purchased and installed in an automobile that provides the above functions without weakening over time.

BRIEF SUMMARY OF THE INVENTION

In one aspect of the invention, an improved magneto-elastic based sensor assembly is provided to effectively measure stress and strain in systems having a portion, which is subject to a mechanic load. The invention also provides a method of determining a direction of a load vector acting on a magneto-elastic based sensor assembly.

In one aspect of the invention, a tow hitch assembly includes a hitch tube, a first part, a second part, a receiver tube, and first and second load sensor pins 8, 9 connecting the first and second parts. The hitch tube is typically a longitudinally extending, round, oval, square, or other shape member for attaching to a vehicle, typically near the rear bumper of a passenger vehicle. Bolts or other fastening means may be used to attach the hitch tube to the vehicle.

The first part of the tow hitch assembly may be a bracket with two side flange portions having through-holes: first and second through-holes on one flange, and third and fourth through-holes on the other, such that the first and third through-holes are axially aligned with each other and the second and fourth through-holes are also axially aligned with each other.

The second part may include a receiver tube connected to a longitudinally extending middle adapter member that fits between the two flanges of the bracket when the hitch components are in an assembled state. In one aspect, the adapter may be configured to include a front portion that would be positioned in front of the hitch tube, and a back portion that would be positioned in back of the hitch tube, the front and the back portions each having a through-hole axially aligned with the through-holes on the bracket when the first and second parts are in an assembled state. In another aspect, the entirety of the adapter could be in front of the hitch tube, or behind the hitch tube, or in some other configuration.

In another aspect, the first and second load sensor pins 8, 9 are configured to sense forces applied to the receiver tube and other components of the hitch assembly. One of the two load sensor pins 8, 9 extends through the first and third through-holes of the bracket and one of the through-holes of the adapter, and the other pin extends through the second and fourth through-holes of the bracket and a different through-hole of the adapter to secure the first and second parts together.

In another aspect, there is a gap of about 0.5 mm between the top of the middle adapter member and the base portion of the bracket, and the thickness of the base portion of the bracket in the configuration shown is 8 mm. Alternatively, the thickness of the base portion of the bracket is about 10 mm, and the gap is about 5 mm between the top of the middle adapter member and the base portion of the bracket. Press-fit bushings could be used, having a pre-determined radial thickness inserted into the axially-aligned through-holes of the bracket.

In another aspect, during use of the assembled tow hitch, a force is applied to the proximate end of a drawbar and transmitted to the front pin. The output signals from magnetic field sensors associated with the front pin may be received in a suitable software algorithm, for example one that is embedded on a circuit board having a suitable processor located inside the front pin. The receive output signals from the sensors, which may be indicative of the magnetic field/flux exhibited by the front pin magneto-elastic active regions, may be used to determine the forces.

In U.S. Pat. No. 9,347,845, owned by Methode Electronics, which is incorporated herein by reference in its entirety, a magneto-elastic sensor having a longitudinally extending shaft like member with at least one magneto-elastically active region and a magnetic field sensor device is described. The longitudinally extending shaft like member is subject to a load introducing mechanic stress in the member. The at least one magneto-elastically active region is directly or indirectly attached to the shaft like member. However, the at least one magneto-elastically active region may also form a part of the member. The magneto-elastically active region is arranged in such a manner that the mechanic stress is transmitted to the active region. The region includes at least one magnetically polarized region such that the magnetic polarization becomes increasingly helically shaped as the applied stress increases. The magnetic field sensor means or device is arranged proximate the at least one magneto-elastically active region. The magnetic field sensor means/device is further configured for outputting a signal corresponding to a stress-induced magnetic flux, which emanates from the magnetically polarized region. The sensor may be a magnetic sensor device with at least one direction sensitive magnetic field sensor. This direction sensitive magnetic field sensor is configured for determination of a shear stress and/or of a tensile or compressive stress. In particular, the direction sensitive magnetic field sensor is arranged to have a predetermined and fixed spatial coordination with the member.

One object of the invention described herein, which is also described in EP17162429.9, owned by Methode Electronics and incorporated herein by reference in its entirety, is a sensor assembly for force sensing, the force sensor being associated with a vehicle hitch assembly. The improved magneto-elastic based sensor assembly is useful for effectively measuring stress and strain in systems having a portion, which is subject to a mechanic load. The invention provides a method of determining a direction of a load vector acting on a magneto-elastic based sensor assembly.

According to an aspect of the invention, a sensor assembly for force sensing can include a first portion having a first and a second through-hole. The sensor assembly can further include a second portion having a third and a fourth through-hole. The third and the fourth through-hole can be positioned in correspondence to the first and the second through-holes.

The sensor assembly can further include a first pin and a second pin. The first pin can be arranged such that it extends through the first and the third through-hole and the second pin can be arranged such that it extends through the second and the fourth through-hole, so as to couple the first portion to the second portion. At least one out of the first and the second pin can include at least one magneto-elastically active region that may directly or indirectly be attached to or form a part of the pin in such a manner that mechanic stress on the pin is transmitted to the magneto-elastically active region. The magneto-elastically active region can include at least one magnetically polarized region such that a polarization of the magnetically polarized region may become increasingly helically shaped as the applied stress increases.

The sensor assembly can further include a magnetic field sensor means or device which may be arranged proximate the at least one magneto-elastically active region. The magnetic field sensor means/device may be configured to output a signal corresponding to a stress-induced magnetic flux which may emanate from the magnetically polarized region. The magnetic field sensor means/device may comprise at least one direction sensitive magnetic field sensor which may be configured to determine a shear force in at least one direction. The at least one direction sensitive magnetic field sensor may in particular be arranged to have a predetermined and fixed spatial coordination with the pin, wherein this pin may at least be partially hollow. The at least one direction sensitive magnetic field sensor may be arranged inside an interior of this pin.

By means of the sensor assembly, stress which is applied to a pin caused by a mechanic load can effectively be measured. The sensor assembly according to aspects of the invention thus described overcomes the drawback of the prior art solutions. In particular, the sensor assembly does not tend to drift with respect to the measurement values and is less error-prone.

According to another aspect of the invention, at least one out of the first and the second pin of the sensor assembly can comprise at least one X-direction sensitive magnetic field sensor, which can be configured to detect a force component Fx1 in a longitudinal direction X, and/or at least one Z-direction sensitive magnetic field sensor, which can be configured to detect a force component Fz1 in a vertical direction Z. The longitudinal direction X can be defined by a direction of longitudinal extension of the second portion. The vertical direction Z can be substantially perpendicular to the longitudinal direction X and substantially perpendicular to the transversal direction Y of longitudinal extension of the at least one pin.

According to another aspect of the invention, the first through-hole and the third through-hole of the sensor assembly can be configured such that they encompass the first pin in a positive-fitting manner. A positive-fitting manner of the fitting allows the pin to be substantially rigidly fixed to the first portion and the second portion by the first and the third through-hole. This means that the pin has almost no play inside the first and third through-hole and that the accuracy of the force measurement is advantageously increased compared to a configuration in which the first pin has play inside the first and the third through-hole.

According to another aspect of the invention, the first pin may be cryogenically treated, such as by subjecting the entire first pin to liquefied nitrogen, thereby causing a reduction in the cross-section dimension of the pin. After super-cooling the first pin, it may be positioned in the first and third through-holes and allowed to return to ambient temperature. As the material in the pin warms up to ambient temperature, the cross-section dimension will increase until the first pin is substantially rigidly fixed in the first and third through-holes.

According to another aspect, the second pin of the sensor assembly may be encompassed by the second through-hole in a positive-fitting manner and the fourth through-hole may be configured such that the second pin may have one additional degree of freedom of movement within the fourth through-hole. The additional degree of freedom of movement allows the second pin to be insensitive with respect to shear forces acting in the direction of the additional degree of freedom of movement. This means that the determination of the shear force along this direction can advantageously be simplified since the shear effect occurs exclusively on the first pin.

According to another aspect, the second pin, like the first pin, may be cryogenically treated, such as by subjecting the entire first pin to liquefied nitrogen, thereby causing a reduction in the cross-section dimension of the pin. After super-cooling the second pin, it may be positioned in the second and fourth through-holes and allowed to return to ambient temperature. As the material in the second pin warms up to ambient temperature, the cross-section dimension will increase until the second pin is substantially rigidly fixed in the second and fourth through-holes with the additional degree of freedom of movement noted above.

According to another aspect, the additional degree of freedom of movement may extend in the longitudinal direction X. Since the additional degree of freedom of movement corresponds to the longitudinal direction X, the determination of the shear force along this direction can advantageously be simplified.

According to another aspect, the first and/or the second pin of the sensor assembly can include a first magneto-elastically active region and a second magneto-elastically active region. The first and the second magneto-elastically active regions may be directly or indirectly attached to or form parts of the pin in such a manner that mechanic stress may be transmitted to the magneto-elastically active regions. Each magneto-elastically active region can include a magnetically polarized region. Particularly, the magnetic polarization of the first magneto-elastically active region and the magnetic polarization of the second magneto-elastically active region may be substantially opposite to each other. The magnetic field sensor means/device can include at least one first direction sensitive magnetic field sensor which may be arranged approximate the first magneto-elastically active region. The magnetic field sensor means/device may be configured to output a first signal corresponding to a stress-induced magnetic flux which may emanate from the first magneto-elastically active region. The magnetic field sensor means/device may include at least one second direction sensitive magnetic field sensor which may be arranged approximate the second magneto-elastically active region. The magnetic field sensor means/device may be configured to output a second signal corresponding to a stress-induced magnetic flux which may emanate from the second magneto-elastically active region. This way, the shear force can advantageously be determined in two opposing directions thereby improving the quality of the determination of the shear force. This “vice versa” configuration of the magnetic field sensors enables the shear directions to be determined by the magneto-elastically active regions. For example, the directions may be distinguishable, if the measurement data, which is acquired from the first direction sensitive magnetic field sensor and the second direction sensitive magnetic field sensor, is differentially processed.

The differential evaluation of the signals advantageously doubles the signal, which is correlated with the applied stress. Because the polarization of the first and second magneto-elastically active region is opposite to each other, theoretically possible external fields may be compensated. The sensor assembly according to this embodiment may be more sensitive and less susceptible to errors.

According to another aspect of the invention, the first and/or the second pin of the sensor assembly can include at least one first X-direction sensitive magnetic field sensor and/or at least one second X-direction sensitive magnetic field sensor and/or at least one Z-direction sensitive magnetic field sensor and/or at least one second Z-direction sensitive magnetic field sensor. The at least one X-direction sensitive magnetic field sensor may be configured to detect a force component Fx1 in the first magneto-elastically active region in the longitudinal direction X of the second portion. The at least one second X-direction sensitive magnetic field sensor may be configured to detect a force component Fx2 in the second magneto-elastically active region in the longitudinal direction X of the second portion. The at least one Z-direction sensitive magnetic field sensor may be configured to detect a force component Fz1 in the first magneto-elastically active region in the vertical direction Z. The at least one second Z-direction sensitive magnetic field sensor may be configured to detect a force component Fz2 in the second magneto-elastically active region in the vertical direction Z. Advantageously, the shear force can be determined in different directions being perpendicularly aligned with respect to each other.

According to another aspect, the first pin of the sensor assembly can include the at least one Z-direction sensitive magnetic field sensor and the at least one second Z-direction sensitive magnetic field sensor. Advantageously, the first pin can be configured to exclusively react on a shear force acting along the Z-direction.

According to still another aspect of the above invention, the first pin of the sensor assembly can include the at least one first X-direction sensitive magnetic field sensor, the at least one second X-direction sensitive magnetic field sensor, the at least one first Z-direction sensitive magnetic field sensor and the at least one second Z-direction sensitive magnetic field sensor and the second pin of the sensor assembly can comprise the at least one Z-direction sensitive magnetic field sensor and the at least one second Z-direction magnetic field sensor. Advantageously, the first pin can be configured to exclusively react on the shear effect along the X-direction which simplifies the shear force evaluation, wherein the shear force along the vertical Z-direction is acting on both load sensor pins 8, 9.

According to another aspect, the first pin of the sensor assembly can include the at least one first X-direction sensitive magnetic field sensor, the at least one second X-direction sensitive magnetic field sensor, the at least one first Z-direction sensitive magnetic field sensor and the at least one second Z-direction sensitive magnetic field sensor, and the second pin of the sensor assembly can include the at least one first X-direction sensitive magnetic field sensor, the at least one second X-direction sensitive magnetic field sensor, the at least one first Z-direction sensitive magnetic field sensor and the at least one second Z-direction sensitive magnetic field sensor. This way, both load sensor pins 8, 9 are sensitive to all shear forces along the vertical Z-direction as well as along the longitudinal X-direction. The first and the second pin advantageously can detect the different components of the shear force at different positions of the system.

The magnetic field sensor means/device may be configured for determination of a first component and a second component of the load, which is applied to the pin. In particular, the at least one first X-direction sensitive magnetic field sensor and the at least one second X-direction sensitive magnetic field sensor can form a first group of sensors and the at least one first Z-direction sensitive magnetic field sensor and the at least one second Z-direction sensitive magnetic field sensor can form a second group of sensors. The first group of sensors is suitable for determination of a load component, which is directed along the X-axis. The second group of sensors senses a component of the load, which is substantially perpendicular to the first component along the Z-direction. Consequently, the direction and the value of the stress or force, which is applied to the load sensor pins 8, 9, may be determined from said components in this coordinate system.

According to another aspect, the second portion of the sensor assembly can comprise a center wall which may extend in the longitudinal direction X and the vertical direction Z. The third and the fourth through-hole may also extend through the center wall. Advantageously, the center wall allows the first portion to be effectively affected by the shear force at an additional point of action.

According to another aspect, the first and/or the second pin of the sensor assembly may be fixedly attached in a predetermined manner to the first portion. The first and/or the second pin can advantageously be fixedly attached in all six degrees of freedom. This way, the determination of the shear forces is effectively possible since the load sensor pins 8, 9 do not have play inside the through-holes of the first portion.

According to another aspect, the first portion of the sensor assembly can have a yoke-like shape. The yoke legs of the first portion can comprise the first and the second through-holes. The second portion of the sensor assembly can have a tubular shape. The side walls of the second portion can comprise the third and fourth through-holes. The direction sensitive magnetic field sensor(s) may be configured to detect force components of shear forces introduced into the load sensor pins 8, 9 by the first portion and the second portion. Advantageously, a yoke-like shape of the first portion and a tubular shape of the second portion allow the sensor assembly to be implemented in an elongated joint connection of two objects, whereas the load sensor pins 8, 9 are arranged in the through-holes and connect both objects.

According to another aspect, the first portion of the sensor assembly can have a yoke-like shape. The yoke legs of the first portion can comprise the first and the second through-holes. The center wall can comprise the third and fourth through-holes. The direction sensitive magnetic field sensor(s) may be configured to detect force components of shear forces introduced into the load sensor pins 8, 9 by the first portion and the second portion. In particular, the side walls of the second portion can comprise through-holes which may be larger than the third and the fourth through-holes such that the shear forces may be introduced into the load sensor load sensor pins 8, 9 by abutment surfaces of the first and the second through-holes in the yoke legs and abutment surfaces of the third and the fourth through-holes in the center wall. The abutment surfaces allow the transmission of power between the first portion and the second portion to be configured in an advantageous manner.

According to another aspect, a tow coupling can comprise a sensor assembly wherein the first portion is a hitch assembly that may be configured to be attached to a car chassis and wherein the second portion may be a receiving tube which may be configured to receive a drawbar, alternatively a hitch bar or a ball mount of the tow coupling. Advantageously, the sensor assembly is configured to detect the forces of a tow coupling of an automobile, which may be part of a land based on-road or off-road vehicle.

According to another aspect, the first portion of the sensor assembly may be a supporting yoke having two yoke legs. The yoke legs may comprise recesses which are aligned in correspondence to each other and which represent the first and the second through-holes of the first portion.

According to another aspect, the first portion of the sensor assembly may be a supporting yoke having four yoke legs. The yoke legs may comprise recesses which are aligned in correspondence to each other and which represent the first and the second through-holes of the first portion.

According to another aspect, the sensor assembly dispenses with a mechanical linkage or connection between the magnetic field sensor means and the second portion. This eliminates sources of error, which result from mechanic failure of this connection. The sensor assembly reliably operates even under extreme operating conditions. The drift of the measurement values during long term measurement is reduced. The sensor assembly according to aspects of the invention is versatile in that it may be applied to or integrated in nearly every tubular shaped portion, which may be for example a part of a hydraulic unit of a land-, marine-, rail- or air transport vehicle.

According to another aspect, the forces which are detectable by the sensor assembly are not exclusively restricted to shear forces which originate from shear stress but may also originate due to tensile or compressive stress acting on the magneto-elastically active region(s) of the first pin and/or the second pin of the sensor assembly. In other words, shear stress and normal stress may both induce a variation of the polarization of the magnetically polarized region emanating from the magneto-elastically active region(s). This polarization may be detectable by the magnetic field sensor means which may output a signal corresponding to a stress-induced magnetic flux towards the polarization direction sensitive magnetic field sensor that may be configured to determine the acting force. Consequently, the magneto-elastically active region may be sensitive to all stress types. The embodiment may particularly be suitable, if the pin is exposed to only one single type of stress.

According to another aspect, the direction sensitive magnetic field sensors L may be one of a Hall-effect, magneto-resistance, magneto-transistor, magneto-diode, MAGFET field sensors or fluxgate magnetometer. These aspects advantageously apply to all embodiments of the invention.

According to another aspect, any hydraulic piston, crane application, car and other various applications incorporating bolts and load sensor pins 8, 9, where shear forces may be applied, may be equipped with the sensor assembly according to aspects of the invention. Traditionally, shear force sensors using strain-gauges are designed in that they get intentionally weaken to provide enough deformation so as to allow a measurement of the applied loads. The magneto-elastically active region of the sensor assembly, however, provides the possibility to design the bolt without weaken locations and significantly higher overload capability. The load pin having the integrated magneto-elastically active region provides the possibility to detect shear forces in load sensor pins 8, 9, screws, bolts etc.

According to another aspect, a method of determining a direction of a load vector is provided. Within said method, a sensor assembly according to aspects of the invention is provided. In other words, a sensor assembly is provided which can comprise a first portion having a first and a second through-hole. The sensor assembly can further comprise a second portion having a third and a fourth through-hole. The third and the fourth through-hole can be positioned in correspondence to the first and the second through-hole. The sensor assembly can further comprise a first pin and a second pin. The first pin can be arranged such that it extends through the first and the third through-hole and the second pin can be arranged such that it extends through the second and the fourth through-hole, so as to couple the first portion to the second portion. At least one out of the first and the second pin can comprise at least one magneto-elastically active region that may directly or indirectly be attached to or form a part of the pin in such a manner that mechanic stress on the pin is transmitted to the magneto-elastically active region. The magneto-elastically active region can comprise at least one magnetically polarized region such that a polarization of the magnetically polarized region may become increasingly helically shaped as the applied stress increases. The sensor assembly can further comprise a magnetic field sensor means which may be arranged approximate the at least one magneto-elastically active region. The magnetic field sensor means may be configured to output a signal corresponding to a stress-induced magnetic flux which may emanate from the magnetically polarized region. The magnetic field sensor means may comprise at least one direction sensitive magnetic field sensor which may be configured to determine a shear force in at least one direction. The at least one direction sensitive magnetic field sensor may in particular be arranged to have a predetermined and fixed spatial coordination with the pin, wherein this pin may at least be partially hollow. The at least one direction sensitive magnetic field sensor may be arranged inside an interior of this pin.

Furthermore, within the method according to another aspect, the first pin and the second pin may be exposed to a load. Measurement data of the at least one direction sensitive magnetic field sensor may be processed so as to determine a shear stress and/or a tensile or compressive stress that is applied by the second portion and the first portion to the first and/or second load sensor pins 8, 9.

In particular, a direction of a force F may be determined from the measurement data on the one hand and the predetermined and known spatial coordination between the direction sensitive magnetic field sensor(s), the first pin, the second pin and the point of load. The force F is applied to the sensor assembly via the second portion.

Same or similar advantages which have been already mentioned with respect to the sensor assembly having a magneto-elastically active region according to aspects of the invention apply in a same or similar way to the method of determining a direction of the load vector and will be not repeated.

Devices and methods related to magnetizing a cylindrical shaft, pin, or similar shaped object, and using magnetic field sensors positioned proximate to the same for detecting a magnetic flux emanating from the object and other magnetic fields, are disclosed in one or more of the following patents owned by Methode Electronics, the entire contents and disclosures of which are incorporated herein by reference: U.S. Pat. No. 6,490,934 (“Circularly magnetized non-contact torque sensor and method for measuring torque sing the same”); U.S. Pat. No. 6,553,847 (“Collarless circularly magnetized torque transducer and method for measuring torque using the same”); U.S. Pat. No. 6,904,814 (“Magnetic torque sensor system”); U.S. Pat. No. 7,140,258 (“Magnetic-based force/torque sensor”); U.S. Pat. No. 8,087,304 (“Magneto-elastic torque sensor with ambient field rejection”); U.S. Pat. No. 8,578,794; (“Magneto-elastic torque sensor with ambient field rejection”); and U.S. Pat. No. 8,893,562 (“System and method for detecting magnetic noise by applying a switching function”).

In many of the above references, a magneto-elastic torque sensor is described, in which an output signal indicative of a force applied to a member is provided. The sensor includes a first magneto-elastically active region in the member, the region being ferromagnetic, magnetostrictive magnetically polarized in a single circumferential direction and possessing sufficient magnetic anisotropy to return the magnetization in the region to the single circumferential direction when the applied torque is reduced to zero, whereby the ferromagnetic, magnetostrictive region produces a magnetic field varying with the torque. Magnetic field sensors are mounted proximate to the ferromagnetic, magnetostrictive region to sense the magnetic field at the sensors and provide the output signal in response thereto.

Apparatus and methods related to strain-induced magnetic anisotropy to measure the tension or compression present in a plate-like object are described in US20150204737 (“Magneto-elastic sensor”), owned by Methode Electronics, the entire content and disclosure of which are incorporated herein by reference. The device includes an annular region of a plate is magnetized with a circumferential magnetization. Magnetic field sensors are then placed near this magnetized band at locations where the magnetization direction is non-parallel and non-perpendicular to the axis of tension. The strain-induced magnetic anisotropy caused by tension or compression then produces a shift in the magnetization direction in the plate regions near the field sensors, thereby causing magnetic field changes which are detected by the magnetic field sensors. The magnetic field sensors are connected to an electronic circuit which outputs a voltage signal which indicates the tension or compression in the plate.

According to another aspect, an embedded software program is used to receive signals from various sensors and output a signal containing information useful in determining or assessing a load weight gauge (measuring the tongue load of a tow coupling), a tow load weight shift alert, an unsafe trailer load distribution alert, a vehicle limit notification, an automated trailer brake control (closed loop), a low/flat trailer tire notification, a check trailer brake notification, a closed loop braking control, a vehicle shift control, an engine control, and a stability control.

According to another aspect, shielding material or a shielding device or multiple shielding devices may be used to shield the load sensor pins 8, 9 from the effects of external magnetic sources, such as nearby permanent magnets. In one embodiment, a flux directly may be used to direct external magnetic fields to minimize or reduce their effect on the load sensor pins 8, 9 and the output signal from the load sensor pins 8, 9.

According to another aspect, the load sensor pins 8, 9 output one or more signals to one or more microcontroller units. The microcontrollers are adapted to processing the signals and providing processed signals to a vehicle onboard control system via the vehicle's bus network. The processed signal may include information related to a comparison of the load pin forces to one or more threshold forces and instructional data for corrective actions to be taken by one or more vehicle control systems in response thereto.

In another aspect, the load sensor pins 8, 9 and other components of the tow coupling apparatus may be used to measure a sprung weight of a towing or towed vehicle by measuring the sheer forces on the load sensor pins 8, 9 caused by the weight on the vehicle producing a force on the load sensor pins 8, 9.

The present invention provides additional advantageous features related to magneto-elastic sensors for measuring forces, especially loads applied to one or more components of a vehicle hitch assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a simplified, schematic diagram of the outside of a load sensor pin for use with a tow coupling apparatus;

FIG. 2 is a simplified, schematic diagram of the outside of another load sensor pin for use with a vehicle tow coupling apparatus;

FIG. 3 is a simplified, perspective, exploded view diagram of some of the components of a “front” load sensor pin;

FIG. 4 is a simplified perspective view schematic diagram of a multi-pin electrical connector for use with the load sensor pin of FIG. 3;

FIG. 5 is a simplified, cross-sectional, plan view diagram of the load sensor of FIG. 3;

FIG. 6 is a simplified, perspective exploded view diagram of some of the components of a “back” load sensor pin;

FIG. 7 is a simplified, cross-sectional, plan view diagram of the load sensor of FIG. 6;

FIG. 8 is a simplified, partial, cross-sectional, plan view diagram of the load sensor of FIG. 6;

FIG. 9 is a simplified, partial, cross-sectional, plan view diagram of the “front” and “back” load sensor pins of FIGS. 3 and 6 and some of the components of a tow coupling apparatus;

FIG. 10A is a simplified, cross-sectional view drawing of another aspect of a load sensor pin;

FIG. 10B is a simplified, partial, cross-sectional, perspective view diagram of the load sensor pin of FIG. 10A;

FIG. 10C is a simplified, partial, perspective view diagram of another aspect of a load sensor pin of FIG. 10A;

FIG. 10D is a simplified, end view diagram of yet another aspect of the load sensor pin of FIG. 10A;

FIG. 11A is a simplified, schematic diagram of the load sensor pin of FIG. 2 with a shielding device;

FIG. 11B is a simplified, exploded, perspective view diagram of the components of a load sensor pin showing a printed circuit board between two elongated magnetic field shielding members;

FIG. 12A is a simplified, partial, perspective view diagram of some of the components of a load sensor pin having a secondary magnetic field sensor;

FIG. 12B is another simplified, partial, perspective view diagram of some of the components of the load sensor pin of FIG. 12A;

FIG. 13 is a simplified, partial, perspective view diagram of some of the components of a tow coupling apparatus showing front load sensor pin 8 and back load sensor pin 9;

FIG. 14 is another simplified, partial, perspective view diagram of the components of the tow coupling apparatus showing front load sensor pin 8 and back load sensor pin 9;

FIG. 15 is a simplified, partial, cross-sectional, end view diagram of the components of the tow coupling apparatus of FIG. 13;

FIG. 16 is another simplified, partial, cross-sectional, end view diagram of the components of the tow coupling apparatus of FIG. 13;

FIG. 17A is a simplified, partial, perspective view diagram of the tow coupling apparatus of FIG. 14;

FIG. 17B is a close-up simplified, partial, perspective view diagram of the apparatus of FIG. 14;

FIG. 18A is a simplified, partial, perspective view diagram of some of the components of the tow coupling apparatus of FIG. 14 showing a first load case;

FIG. 18B is another simplified, partial, perspective view diagram of some of the components of the tow coupling apparatus of FIG. 14 showing a different load case;

FIG. 19A is a simplified, partial, perspective view diagram of the vehicle tow coupling apparatus of FIG. 14 with a shielding device;

FIG. 19B is a semi-transparent diagram of FIG. 19A;

FIG. 19C is another view of the shielding device of FIG. 19A;

FIG. 20 is a simplified, side view diagram of the tow coupling apparatus of FIG. 14 showing another load case;

FIG. 21 is a simplified, side view diagram of a tow coupling apparatus and vehicle components;

FIG. 22 is a simplified, perspective view diagram of one component of a tow coupling apparatus showing upper and lower load sensor pins 8, 9;

FIG. 23 is a simplified, perspective view diagram of the coupling components of a vehicle tow coupling apparatus;

FIG. 24 is a simplified, perspective, exploded view diagram of some of the components of another tow coupling apparatus;

FIG. 25 is another simplified, perspective, exploded view diagram of the modified components of the tow coupling apparatus of FIG. 24;

FIG. 26 is a simplified, perspective view diagram of the components of the tow coupling apparatus of FIG. 24;

FIG. 27 is a simplified, process flow diagram of a method of cryogenically treating a load sensor pin;

FIG. 28A is a simplified, partial, exploded, perspective view diagram of a tow coupling apparatus including load sensor pins 8, 9;

FIG. 28B is another simplified, partial, exploded, perspective view diagram of the tow coupling apparatus of FIG. 28A;

FIG. 29 is a simplified, exploded, perspective view diagram of some of the components of the vehicle tow coupling apparatus of FIG. 28A;

FIG. 30 is a simplified, partial, cross-sectional view diagram of the tow coupling apparatus of FIG. 28A;

FIG. 31A is another simplified, plan view diagram of a load sensor pin;

FIG. 31B is an end view diagram of the load sensor pin of FIG. 31A;

FIG. 32A is a simplified, partial, axial, cross-sectional view diagram of a load sensor pin for use in the tow coupling apparatus of FIG. 31A;

FIG. 32B is a simplified, partial, cross-section, end view diagram of the load sensor pin of FIG. 32A;

FIG. 33 is simplified, partial, cross-sectional view diagram of a load sensor pin for use in a tow coupling apparatus;

FIG. 34 through FIG. 41 are simplified, schematic, top view diagrams of a portion of a tow coupling apparatus showing various simplified load cases;

FIGS. 42A through 42AA are perspective view diagrams of tow hitch assemblies, towed or towing vehicles, and weight sensing assemblies using one or more load sensor pins at various force transmitting components.

DETAILED DESCRIPTION OF THE INVENTION

Several preferred embodiments of the invention are described for illustrative purposes, it being understood that the invention may be embodied in other forms not specifically described below and/or shown in the drawings.

For reference purposes, a Cartesian coordinate system is used to describe certain features, components, and directions, and unless otherwise stated or shown in the figures otherwise, the x-axis generally refers to a longitudinal direction, the y-axis generally refers to a transverse direction that is perpendicular to the x-axis, and the z-axis generally refers to a vertical direction that is perpendicular to a plane formed by the x- and y-axes.

Turning first to FIG. 1, shown therein is a simplified, schematic diagram of a load sensor pin 8 (and similar load sensor pin 9; as best seen in FIG. 5) for use with a tow coupling apparatus, one that is adapted to being attached to a towing vehicle (e.g., passenger automobile car or truck; not shown) at/near the back/rear bumper of the towing vehicle. The load sensor pin 8 referred to here is a “front” load sensor pin given its relative position with respect the load sensor pin 9; that is, in one embodiment, the load sensor pin 8 is installed in the tow coupling apparatus such that it would be closer to the front of a towing vehicle when the tow coupling apparatus is mounted to the towing vehicle, whereas the load sensor pin 9 is behind the load sensor pin 8 and thus would be closer to the back of the towing vehicle. The relative positions of the load sensor pins 8, 9 may be different than the arrangement shown in the drawings, depending on the particular type of tow coupling application.

The load sensor pins 8, 9 may include a center portion 120 and longitudinally spaced apart end portions 130a, 130b on either side of the center portion 120. Between the center portion 120 and the end portion 130a is a magneto-elastically active portion 21 bordered by joints 142a and 144a (the same features are shown on the other side of the center portion 120). The magneto-elastically active portion 21 is treated in such a way that a longitudinally-extending portion of the surface of the load sensor pins possess a magneto-elastic active region for producing an external magnetic field/flux, as further described below.

Each of the load sensor pins 8, 9 are preferably hollow shafts having a wall thickness ranging from about 0.2 mm at its thinnest to about 3 mm at its thickest along its longitudinal dimension, but the actual wall thickness may be determined based on a particular needs of the application in which the load sensor pins 8, 9 are used. The outer surface of the load sensor pins 8, 9 may have portions that are round or flat.

The dimension 122, which spans a portion of the center portion 120 and the magneto-elastically active portion 21 (as well as a portion of the center portion 120 and the magneto-elastically active portion 22), may vary by application. The dimension 124, which is a diameter of the end face of the end portion 130b of the load sensor pin 8, 9 (as well as a diameter of the end face of the end portion 130a of the load sensor pin 8, 9) may also vary as necessary. The dimension 126, which is the width of the magneto-elastically active portions 22 (as well as the width of the magneto-elastically active portions 21) may be about 8 mm to about 24 mm. The dimension 128, which is a diameter of the inner wall surface of the load sensor pin 8, 9 at the ends of the end portion 130a of the load sensor pin 8, 9 (as well as the a diameter of the inner wall surface of the load sensor pin 8, 9 at the ends of the end portion 130b of the load sensor pin 8, 9) may also vary by application.

All or some of the center portion 120 and the end portions 130a, 130b may be made from non-magnetic materials to keep near field magnetic field generating sources, such as a permanent magnet, magnetized wrench, motor, or solenoid, at a minimum distance from the load sensor pins 8, 9 to reduce or eliminate (below detection) the path of magnetic fields from those types of sources. This would limit or eliminate the effect these near field sources have on the force dependent field measurements produced by the magneto-elastically active portions 21, 22 of the load sensor pins 8, 9.

Another way to reduce the influence of external magnetic fields in/on the load sensor pins 8, 9 is to have only the shear areas of the load sensor pins 8, 9 made of ferromagnetic material. That is, it is not necessary for the rest of the load sensor pins 8, 9 to be made from a ferromagnetic material, and in some instances it is rather undesirable as such materials only act as a flux director for channeling external magnetic fields towards the magnetic field measurement coils (not shown).

The load sensor pins 8, 9 are further described in Applicant's European patent application EP17162429.9, which is incorporated herein by reference.

Turning now to FIG. 2, shown therein is a simplified, schematic diagram of another aspect of the load sensor pin 8, 9 of FIG. 1 in which the center portion 120 is divided into two separate center portions 120a, 120b, separated by a joint. In this embodiment, all or some of the center portions 120a, 120b, along with their adjacent magneto-elastic active portions 21, 22, are made from a material and/or treated as described above in such a way that they produce an external magnetic field/flux.

To construct the load sensor pins 8, 9 as shown in FIG. 1 and FIG. 2, the different materials of the various portions could be welded together (e.g. using friction welding). Another possibility would be to take a load sensor pin 8,9 constructed of austenitic stainless steel (non-magnetic) and transform the shear areas to a martensitic material through the process of cold working thus forming the magneto-elastic active portions 21, 22.

Turning now to FIG. 3 and FIG. 5, shown therein are a simplified, perspective and cross-sectional, and exploded view diagrams of some of the components of the first load sensor pin 8. As shown, the load sensor pin 8 includes a retaining clip 302, a printed circuit board 304, a set of connector pins 306, a support member 308 having a pin connector housing 311 (as also shown in FIG. 4) on a terminating end, and a pair of sealing rings 310. The retaining clip 302 is used to fix the support member 308 in a way that minimizes movement after it is fixed in its final assembled state. The printed circuit board 304 may have one or more (such as four) magnetic field sensors (described below) mounted thereon each with leads for connecting to the set of connector pins 306. The printed circuit board 304 includes a suitable processor, memory, and embedded software (not shown). The set of connector pins 306 include insert molded pins on one end for extending up and through pre-drilled through-holes on the printed circuit board 304 for connecting to the one or more magnetic field sensors and other circuit components on the printed circuit board 304. The other end of the set of connector pins 306 terminate with suitable latch-type or friction fit-type pins that connect with a suitable connector of an electrical harness (as best seen in FIG. 12A). The sealing rings 310 are used to prevent anything from entering the interior of the load sensor pin 8.

Turning now to FIG. 6 and FIG. 7, shown therein are simplified, perspective and cross-sectional, exploded view diagrams of some of the components of the second load sensor pin 9. As shown, the load sensor pin 9 includes a retaining clip 602, a printed circuit board 604, a set of connector pins 606, a support member 608, a pair of sealing rings 610, and a connector housing 611. The retaining clip 602 is used to fix the support member 608 after it is fixed in its final assembled state to prevent movement. The printed circuit board 604 may have one or more (such as eight) magnetic field sensors (not shown) mounted thereon each with leads for connecting to the connector pins 606, which in turn lead to a flat, circular-shaped printed circuit board. The printed circuit board 604 includes a suitable processor, memory, and embedded software (not shown). A micro ribbon or cable (as shown in FIG. 8) connects the printed circuit board 604 and a circular printed circuit board. The flat, circular-shaped printed circuit board connects to a four-pin connector inside the connector housing 611. The sealing rings 610 are used to prevent anything from entering the interior of the load sensor pin 9.

Turning now to FIG. 9, shown therein is a simplified, partial, cross-sectional, plan view diagram of the “front” and “back” load sensor pins of FIGS. 3 and 6 and some of the components of a tow coupling apparatus as they could be employed in connection with a tow coupling apparatus (for ease of reference, the two load sensor pins are shown with load sensor pin 9 on top of load sensor pin 8). As shown, the center portions 120 of the load sensor pins 8, 9 are rigidly fixed inside the through-holes of a bracket 902 that generally surrounds the load pins 8, 9. The end portions 130a, 130b of the load sensor pins 8, 9 are further rigidly fixed inside corresponding through-holes of the yoke-like projections 904a, 904b of a generally U-shaped adapter 904 (supporting yoke) that surrounds the bracket 902. Bushings 906a, 906b, 906c, 906d surround respective portions of the load sensor pin 9, and bushings 908a, 908b, 908c, 908d surround respective portions of the load sensor pin 8. The bushings may be brass or some other material. In some embodiments, no bushings are used between the end portions 130a, 130b of the load sensor pins 8, 9 and the respective through-holes of the side yoke-like projections 904a, 904b of the adapter 904. In that embodiment, the load sensor pins 8, 9 are in direct contact with the walls of the through-holes.

The load sensor pins 8, 9 are made from one or more materials, in addition to ferromagnetic materials, and are constructed in such a way that they are suitable for forming the magneto-elastic active regions 21, 22. The chosen materials and construction of the various portions of the load sensor pins 8, 9 should be such that the nature of the shaft of the load sensor pins 8, 9 is one that is elastically deformable. This provides for the relative movement between the center portions 120 (caused by a force imparted by the bracket 902 on the center portions 120) and the rigidly fixed end portions 130a, 130b (maintained in a stationary position by the adapters 904). The eccentric deformation caused by forces imparted on the load sensor pins 8, 9 causes the magneto-elastic active regions 21, 22 to produce the external magnetic field/flux as previously described.

Turning now to FIGS. 10A through 10D, shown therein are a simplified cross-sectional, perspective view drawings of others aspects of a load sensor pin 8, 9. In FIG. 10A, a load sensor pin 8 has a length along its longitudinal direction such that the slot 312 (and slot 612) for receiving the retaining clip 302 is outside the bushing 908d (906d in the case of the load sensor pin 9). In one embodiment, the slots 312, 316 may be about 1.5 mm wide and have an inner diameter of about 24 mm, and they may be about 4 mm from the end of the load sensor pin 8. In FIG. 10C, the retaining clip 302 includes a raised flange or post 302a that fits inside a pole yoke opening 314 as best seen in FIG. 10B to prevent the retaining clip 302 from slipping out of its slot 312 (similarly, the retaining clip 602 includes a raised flange or post to prevent the retaining clip 602 from slipping out of its slot 612). The pole yoke opening 314 may extend through the wall of the load sensor pin 8, for example to accept a raised flange or post 302a having about a 2 mm length. In FIG. 10D, one possible configuration for the retaining clips 302, 602 is shown.

Turning now to FIG. 11A and FIG. 11B, shown therein is a simplified, schematic diagram of one of the load sensor pins 8, 9 of FIG. 2 inside a shielding device 910, and a simplified, exploded, perspective view diagram of the components of a load sensor pin 8, 9 showing a printed circuit board 304, 604 between two elongated magnetic field shielding members 912a, 912b, respectively. In FIG. 11A, the shielding device 910 may be a box or other shape and is made using materials with high magnetic permeability, which shunts an external magnetic field by offering a path of low resistance to the field and thereby minimizing or eliminating the influence of the field on the force dependent field measurements produced by the load sensor pins 8, 9. In FIG. 11B, the shielding members 912, 912b also help to minimize or eliminate the influence of the field on the force dependent field measurements produced by the load sensor pins 8, 9. Shielding effects are further described in Applicant's U.S. Pat. No. 8,578,794 (Magneto-elastic Torque Sensor with Ambient Field Rejection), which is incorporated herein by reference in its entirety.

Turning now to FIG. 12A, shown therein is a simplified, partial, perspective view diagram of some of the components of a load sensor pin having a secondary magnetic field sensor 916. FIG. 12B shows another simplified, partial, perspective view diagram of some of the components of the load sensor pin of FIG. 12A. The components of one of the load sensor pins 8, 9, is shown in which its respective printed circuit board 304, 604 includes primary magnetic field sensors 914a, 914b and a secondary magnetic field sensor 916. The secondary magnetic field sensor 916 may be a 3-axis compass sensor (either standalone or as part of a 9-axis sensor), which is used to detect the presence of external magnetic fields in the case that the shielding elements described above are not effective in eliminating all external fields. Information outputted by the secondary magnetic field sensor 916 could be used to perform compensation calculations on the force measurements. In addition, each of the load sensor pins 8, 9 could include extra sensing coils arranged in a way to minimize the influence of external magnetic fields on the measurement of the forces by the primary magnetic field sensors 914a, 914b.

The effects of external magnetic fields may also be taken into account by computational means using a suitable algorithm, which may be processed by embedded software on the printed circuit board 304, 604, or in a separate electronics module 980 connected to the printed circuit board 304, 604 via cable connector 982. Due to the mechanical configuration of a sensor system assembly (especially ones with two or more load sensor pins 8, 9 or two sensing planes), there can be certain relationships between the forces detected by the load sensor pins 8, 9 that have to be fulfilled. An external field is likely to cause an implausible relationships/combination of individual forces measured, which an algorithm could detect and compensate for.

Turning now to FIG. 13, shown therein is a simplified, partial, perspective view diagram of some of the components of a tow coupling apparatus showing front load sensor pin 8 and back load sensor pin 9 for coupling a towing vehicle to a towed vehicle. As shown, the tow coupling apparatus includes a bracket 902 attached to a receiver tube 920, and a generally U-shaped adapter 904 attached to a hitch tube 922.

The hitch tube 922 is a longitudinally extending, round, oval, square, or other shape member of the type typically used to attach to a towing vehicle (not shown) near the rear bumper of the towing vehicle. The hitch tube 922 is the component that couples the tow coupling apparatus to the towing vehicle to transmit force (generated by the towing vehicle's engine) to a towed vehicle (not shown), such as a trailer. Bolts or other fastening means may be used to securely attach the hitch tube 912 to the towing vehicle.

The adapter 904 has two side yoke-like projections 904a, 904b extending approximately 90-degrees from a base portion such that they are parallel to each other. Each side wall includes through-holes: first and second through-holes 924-1, 924-2 on the side wall 904b, and third and fourth through-holes 924-3, 924-4 on the side wall 904a, such that the first and third through-holes 924-1, 924-3 are axially aligned with each other, and the second and fourth through-holes 924-2, 024-4 are also axially aligned with each other. The end portions 130a, 130b of the load sensor pins 8, 9 are rigidly fixed inside the through-holes of the side yoke-like projections 904a, 904b of the adapter 904, in some cases using collars or bushings, that surrounds the bracket 902 as shown.

The bracket 902, which may be a single member or two separate members arranged on front and back sides of the hitch tube 922, fits between the two side yoke-like projections 904a, 904b of the adapter 904 when the tow coupling apparatus components are in an assembled state. The bracket 902 includes a front portion and a back portion. The front portion and the back portion each includes a through-hole (not shown) axially aligned with the through-holes on the adapter 904 when the components are in the assembled state. Through-holes on the front and back portions of the adapter 904 may be slightly larger than the through-holes 924-1, 924-2, 924-3, 924-4 such that shear forces transmitted from the receiver tube 920 are introduced into the load sensor pins 8, 9 by abutment surfaces of the through-holes 924-1, 924-2, 924-3, 924-4 in the adapter 904 and abutment surfaces of the through-holes in the bracket 902.

The bracket 902 and the adapter 904 are each made of a material selected from suitable materials that resist deforming over time under a range of expected applied forces.

There may a gap of about 0.5 mm between the top of the bracket 902 and the connecting base portion of the adapter 904 (the portion that connects to the hitch tube 922). The thickness of the base portion of the adapter 904 in the configuration shown may be 8 mm. Alternatively, the thickness of the base portion of the adapter 904 may be 10 mm, which may be achieved, for example, by modifying the placement of the various through-holes and changing other dimensions of the adapter 904.

Turning now to FIG. 14, shown therein is another simplified, partial, perspective view diagram of the components of the tow coupling apparatus showing front load sensor pin 8 and back load sensor pin 9. In this embodiment, an alternative approach to using the adapter 904 is shown. Instead of a one-piece adapter 904 with a base portion, two spaced apart side yoke-like projections 904a, 904b, and through-holes 924-1, 924-2, 924-3, 924-4, the alternative adapter includes four separate adapters 904-1, 904-2, 904-3, 904-4 each separately connected directly to a hitch tube 922 as shown.

Turning now to FIG. 15 and FIG. 16, shown therein are simplified, partial, cross-sectional, end view diagrams of the components of the tow coupling apparatus of FIG. 13. As shown in FIG. 15, the lower edge of the side yoke-like projections 904a, 904b of the adapter 904 include a beveled edge such that there is a gap of about 7 mm between the bevel edge and the closest edge of the receiver tube 920. There is also a gap of about 0.5 mm between the upper edge of the bracket 902 and the base portion of the adapter 904 (the thickness of the base portion here could be about 8 mm or as needed to provide rigidity for the side yoke-like projections 904a, 904b). As shown in FIG. 16, the gap between the upper edge of the bracket 902 and the base portion of the adapter 904 is increased from 0.5 mm to 5 mm (the thickness of the base portion here could be about 10 mm to provide additional rigidity for the side yoke-like projections 904a, 904b). Various other dimensions (thickness) of the base portion of the adapter 904 are also contemplated and may be suitable for different expected forces or loads on the tow coupling apparatus components. Also shown are press-fit bushings having a pre-determined radial thickness inserted into the axially-aligned through-holes of the bracket.

Turning now to FIG. 17A and FIG. 17B, shown therein are simplified, partial, perspective view diagrams of the tow coupling apparatus of FIG. 14. Specifically, a drawbar 930 is shown inserted into the receiver tube 920 and may be fastened in the receiver tube 920 with a connecting pin (not shown). As described below, the drawbar 930 is the connection member between the tow coupling apparatus and the towed vehicle (e.g., trailer), and thus is a force-transmitting member that can be monitored by use of the load sensor pins 8, 9 as previously described.

In particular, FIG. 18A is a simplified, partial, perspective view diagram of some of the components of the tow coupling apparatus of FIG. 14 showing a first load case in which a force is applied to the proximate or free end of the drawbar 930 (i.e., the end closest to the viewer). This applied force will be transmitted to the distal or pinned end of the drawbar 930 inside the receiver tube 920. That is, the force corresponding to the transmitted force at the distal end of the drawbar 930 by the towed vehicle may be transmitted to the receiver tube 920. That force then acts on the bracket 902 attached to the receiver tube 920. As the bracket 902 displaces the load sensor pins 8, 9 (the ends of which are rigidly attached to the adapter 904), the sheer force causes the magneto-elastically active portions 140a, 140b to output a magnetic field that is detectable by magnetic field sensors 914a, 914b.

For example, assume a force is applied to the proximate end of the drawbar 930 in the direction shown. In this embodiment, the force transmitted to the back load sensor pin 9 may be determined with respect to the adapters 904-2, 904-4. The output signals from the magnetic field sensors associated with the load sensor pin 9 may be received in a suitable algorithm, for example one that is embedded on a circuit board having a suitable processor located inside the load sensor pin 9, or in a separate module 980 (FIG. 12A) that could be integrated into the towing vehicle electronics. The received output signals from the load sensor pin 9 (and from the load sensor pin 8) may be indicative of the magnetic field/flux exhibited by the load sensor pins, and thus may be used to determine that a force has vector components of 6653 N in the x-direction and −5138 N in the y-direction (associated with the x-y-z Cartesian coordinate system shown). Moreover, the received output signals may be further used to determine that the other force vector components are −6245 N in the x-direction and 6 N in the y-direction as shown. The algorithm/processor may compute that the force applied to the proximate end of the drawbar 930 has a magnitude of 3514 N and is applied in the direction shown (i.e., toward the right or in the y-direction). The table below indicates the forces that may be determined as a result of forces transmitted to the load sensor pins 8, 9.

TABLE 1

Force Vectors on

Adapters
Front Reaction (N)
Joint Probe (N)
Total (N)

904-1
x
5387.6
0
5387.6

y
6.3344
0
6.3344

z
−2082.9
−1012.4
−3095.3

904-3
x
−5513.2
0
−5513.2

y
1641.7
−29.643
1612.057

z
4731.4
−1772.6
2958.8

904-2
x
6652.6
0
6652.6

y
−5018.3
−119.39
−5137.69

z
399.02
−5634.6
−5235.58

904-4
x
−6245.6
0
−6245.6

y
5.6106
0
5.6106

z
2745.4
2626.7
5372.1

The information about the applied force at the proximate end of the drawbar 930, and related information (such as a result of a comparison of the force computation to a pre-determined force threshold or limit value), may be provided to the towing vehicle for any number of useful purposes, such as displaying the information and/or related information to the vehicle operator or as input to a vehicle system such as a braking system, a stability system, a transmission system, a trailer backing system, or an engine controller system.

Turning now to FIG. 18B, shown therein is another simplified, partial, perspective view diagram of some of the components of the tow coupling apparatus of FIG. 14 showing a different load case as summarized in the following table.

TABLE 2

Force Vectors on

Adapters
Front Reaction (N)
Joint Probe (N)
Total (N)

904-1
x
9285.7
0
9285.7

y
−3343
0
−3343

z
−2947.5
−1493.6
−4441.1

904-3
x
−9282.6
0
−9282.6

y
5.0979
−65.01
−59.9121

z
5260.1
−1087.9
4172.2

904-2
x
11322
0
11322

y
8.541
−128.91
−120.369

z
893.49
−5098.8
−4205.31

904-4
x
−10776
0
−10776

y
9.5836
0
9.5836

z
2265.8
2208.5
4474.3

Turning now to FIG. 19A, FIG. 19B, and FIG. 19C, shown therein are simplified, partial, perspective view diagrams of the vehicle tow coupling apparatus of FIG. 14 in which a shielding device 190 is used to surround the load sensor pins 8, 9 for shielding the magneto-elastically active portions 140a, 140b and the magnetic field sensors 914a, 914b from external magnetic fields. The shielding device 190 is preferably made from or utilizes highly magnetically permeable materials to conduct external magnetic fields away from the load sensor pins 8, 9. The shielding device 190 provides openings for sheathed cables 192, 194, which connect the electronics of the load sensor pins 8, 9 to external circuits, to pass through the shielding device 190. In case of an AC near field source, even a thin metal shielding device 190 is able to provide good shielding. An external AC magnetic field will create eddy currents inside of the shield material, which in turn will create a magnetic field that opposes the incident field, thereby cancelling the incident field. The shielding material may be magnetic or non-magnetic but should have a high electric conductivity.

Turning now to FIG. 20, shown therein is a simplified, side view diagram of the tow coupling apparatus of FIG. 14 showing another load case. In particular, a drawbar 930 with a ball-style hitch (typically welded or bolted to the proximate or free end of the drawbar 930) is shown inserted in the receiver tube 920 and held in place with a fastening pin (other devices for connecting the drawbar and receiver are also contemplated). The large arrows indicate the forces that might act on the assembled tow coupling apparatus in the plane of the diagram (x-z plane, assuming the y-direction is out of the page).

An algorithm (such as in the form of embedded software in/on the load sensor pins 8,9 or in the separate module 980 (FIG. 12A)) may utilize values for the following variables (all linear dimensions are measured along the x- or z-direction as shown):

TABLE 3

Variable/Parameter
Type/Description

Load sensor pin, outer diameter
Length (mm)

Load sensor pin, inner diameter
Length (mm)

Load sensor pin, width overall
Length (L) (mm)

Load sensor pin, height
Length (h_pins) (mm)

Drawbar drop
Length (mm)

Drawbar drop height
Length (h_drop(mm))

Distance to back load sensor pin 9
Length (d_A) (mm)

Distance between load sensor pins
Length (d_pins) (mm)

Drawbar fastening pin hole size, diameter
Length (mm)

Distance between the end of the drawbar and
Length (mm)

the drawbar fastening pin hole

Distance between the coupling point (ball)
Length (mm)

and the drawbar fastening pin hole

Distance of the material between the two
Length (mm)

load sensor pins

Distance from the back load sensor pin to
Length (mm)

the back end of the tow coupling apparatus

Distance between the drawbar fastening pin
Length (mm)

hole and the front load sensor pin

Inputs associated with each of the above variables will be processed by the aforementioned processor which executes software algorithms that are embedded in/on the memory or storage device on the printed circuit boards 304, 604 of the load sensor pins 8, 9, or that are embedded in/on a printed circuit board of the separate module 980 outside the load sensor pins 8, 9. The inputs are used in at least the following equations:

$\begin{matrix} \sum F_{L} = 0 : & (1) \\ F_{L} - A_{L} = 0 & (2) \\ \sum F_{V} = 0 : & (3) \\ F_{V} + A_{V} - B_{V} = 0 & (4) \\ \sum M_{A} = 0 & (5) \\ B_{V} \cdot d_{Pins} + F_{V} \cdot d_{A} + F_{L} \cdot (h_{Pins} + h_{Drop}) = 0 & (6) \\ A_{L} = F_{L} & (7) \\ A_{V} = - F_{V} + B_{V} & (8) \\ B_{V} = \frac{- F_{V} \cdot d_{A} - F_{L} \cdot (h_{Pins} + h_{Drop})}{d_{Pins}} & (9) \end{matrix}$

In one embodiment, the software computes a tongue force (F-tongue), tow force (F-tow), and a sway force (F-sway) according to industry-specific and federal specifications, such as those of Ultimate Load (per SAE J684 for Hitch Test Loads), and Ultimate Loads (per SAE J684 Strength Test Loads for Balls and Trailer couplings). Other methods and standards may also be used, including those for other countries/regions (e.g., European Union).

In another embodiment, the embedded software may be used to receive signals from various other sensors (not shown) and output a signal containing information useful in determining or assessing a load weight gauge (measuring the tongue load of a coupling between the tow and towing vehicles), a tow load weight shift alert, an unsafe towed vehicle load distribution alert, a towing vehicle limit notification, an automated towed vehicle brake control (closed loop) signal, a low/flat towed vehicle tire notification, a check towed vehicle brake notification, a closed loop braking control, a towing vehicle shift control, a towing vehicle engine control, and a towing vehicle stability control.

In still another embodiment, the software may provide a signal corresponding to a value in a pre-determined output range (provided in, e.g., N and lb), an ultimate or maximum load weight carrying output (provided in, e.g., N and lb), and an ultimate or maximum ball load and trailer hitch output (also in, e.g., N and lb).

Additional software inputs may include load sensor pin outer diameter, inner diameter, wall thickness, free length L, and sheer points (all in millimeters). Calculated stress values may include maximum sheer stress and bending stress, among others (all in N/mm²). A static safety factor may also be computed.

Turning now to FIG. 21, shown therein is a simplified, side view diagram of a tow coupling apparatus and vehicle components. In particular, the tow coupling apparatus is mounted such that it does not interfere with a bumper step 940 (which is above the hitch tube 922) and spare tire 944 (which is behind the hitch tube 922, in some cases by only a few inches, such as 3 inches). Spare tires stored below a towing vehicle's body frame or other components are typically lowered to the ground by a cable and winch mechanisms (not shown), and can swing on the cable and potentially strike the tow coupling apparatus. To ensure that the spare tire 944 avoids striking the tow coupling apparatus upon being raised or lowered, an angled guide member 942 is positioned forward of the tow coupling apparatus and between the tow coupling apparatus and the spare tire 944 as shown.

Turning now to FIG. 22 through FIG. 27, shown therein are simplified, schematic, exploded, perspective and plan view diagrams of another tow coupling apparatus for coupling a towing vehicle to a towed vehicle. FIG. 22 is a simplified, perspective view diagram of one component of a tow coupling apparatus showing upper and lower load sensor pins 8, 9 for use with a towed vehicle coupler 220, which mates with a towing vehicle coupler 230. In the embodiments shown, the load sensor pins 8, 9 are arranged generally vertically (along z-axis) with respect to each other (as compared to, for example, the embodiments of FIG. 13 and FIG. 14, in which the load sensor pins 8, 9 are arranged horizontally (along x-axis)). The two load sensor pins 8, 9 are positioned in the towed vehicle coupler 220 in respective upper and lower brackets 222-1, 222-2, with or without bushings. The towing vehicle coupler 230 includes four adapters 232-1, 232-2, 232-3, 232-4 such that the through-holes on the upper bracket 222-1 are axially aligned with the through-holes of the adapters 232-1, 232-2, and the through-holes on the lower bracket 222-2 are axially aligned with the through-holes of the adapters 232-3, 232-4. When aligned, the load sensor pins 8, 9 may be rigidly fixed in the through-holes, such that the couplers 220 and 230 may be coupled together as illustrated in FIG. 24.

In FIG. 25, the towed vehicle coupler 220 is modified such that it includes a hitch part 220a having a bracket 250 and through-holes 252, and a coupler part 220b having through-holes 254. The through-holes 252, 254 permit a user to vertically adjust (z-axis) the relative position of the hitch part 220a and the coupler part 220b with respect to each other (a fastening pin, not shown, is inserted into the through-holes 252, 254, once they are axially aligned). When the hitch part 220a, couplers part 220b, and towing vehicle coupler 230 aligned, the load sensor pins 8, 9 may be rigidly fixed in the through-holes, such that the tow coupling apparatus may be coupled together as illustrated in FIG. 26.

Turning now to FIG. 27, shown therein is a simplified, process flow diagram 270 describing a method for rigidly fixing the load sensor pins 8, 9 inside the brackets and adapters as shown and described above. As an initial step, the load sensor pins 8, 9 are first received along with the various tow coupling apparatus components. With reference to FIG. 13, for example, these would include providing a bracket 902 attached to a receiver tube 920, and a generally U-shaped adapter 904 attached to a hitch tube 922.

In a first treatment step 272, the first magneto-elastically active region 21 and the second magneto-elastically active region 22 of the load sensor pins 8, 9 are each directly or indirectly attached to or form respective parts of the load sensor pins 8, 9, such that the load sensor pins 8, 9 will have the characteristics previously described (the magneto-elastic properties are described in more detail in the aforementioned Applicant's patents incorporated by reference).

In a second treatment step 274, when it is desired for the load sensor pins 8, 9 to have one or more collars (not shown) around all or a portion of the end portions 130a, 130b of the load sensor pins 8, 9, the collars are arranged such that the positions of the one or more collars substantially correspond to one or more of the positions of the through-holes 924-1, 924-2 on the side wall 904b of the bracket 904, and through-holes 924-3, 924-4 on the side wall 904a of the bracket 904. Also, when it is desired for the bracket 902 and adapter 904 to be configured in such a way as to provide a gap therebetween, a gap material may be inserted.

In the next step 276, the load sensor pins 8, 9, and when necessary the collars/bushing 906a, 906b, 906c, 906d, 908a, 908b, 908c, 908d (as best seen in FIG. 9), may be cryogenically treated to reduce their cross-section dimension to permit inserting in the respective through-holes.

In the next step 278, respective printed circuit board 304, 604 with magnetic field sensors are mounted or arranged proximate to the magneto-elastically active portion 140a, 140b either before or after the load sensor pins 8, 9 are treated and positioned in the respective through-holes after being treated.

In a next step, the cryogenically treated load sensor pins 8, 9, and the various tow coupling apparatus components described above are all aligned. The load sensor pins 8, 9 are then inserted and the load sensor pins 8, 9 and other components are allowed to return to ambient temperature. The cryogenic treatment process may be conducted in conjunction with (such as following) a heat treatment process performed on the load sensor pins 8, 9. Both treatment processes are performed in a manner such that crystalline changes following magnetization of the load sensor pins 8, 9 is avoided.

Turning now to FIG. 28A and FIG. 28B, shown therein are simplified, partial, exploded, perspective view diagrams of another type of vehicle tow coupling apparatus 100 incorporating the load sensor pins 8, 9. The tow coupling apparatus 100 includes a sensor assembly 1 for force sensing. The sensor assembly includes a first portion 2 (supporting yoke) having a first through-hole 3 and a second through-hole 4, a second portion 5 (receiving tube) having a third through-hole 6 and fourth through-hole 7. The third and fourth through-holes 6, 7 are positioned in correspondence to the first and second through-holes 3, 4.

The second portion defines a Cartesian coordinate system having a longitudinal x-axis direction, a transversal y-axis direction, and a vertical z-axis direction. The longitudinal direction extends in the direction of longitudinal extension of the second portion. The transversal direction extends in a direction perpendicular to the longitudinal direction and in a horizontal plane. The vertical direction extends in a direction that perpendicular to the longitudinal direction and the transversal direction.

The sensor assembly 1 further includes a first load sensor pin 8 and a second load sensor pin 9. The load sensor pin 8 is arranged such that it extends through the first and third through-holes 3, 6. The load sensor pin 9 is arranged such that it extends through the second and fourth through-holes 4, 7. The first portion 2 is coupled to the second portion 5 via the first and second load sensor pins 8, 9.

At least one out of the first and the second load sensor pin 8, 9 includes at least one magneto-elastically active region 10 (as shown in FIG. 30) that is directly or indirectly attached to or forms a part of the load sensor pin 8, 9 in such a manner that mechanic stress of the load sensor pin 8, 9 is transmitted to the magneto-elastically active region 10. The magneto-elastically active region 10 includes at least one magnetically polarized region such that a polarization of the polarized region becomes increasingly helically shaped as the applied stress increases.

The magnetic field sensor means includes at least one direction sensitive magnetic field sensor L. The at least one direction sensitive magnetic field sensor is configured for determination of a shear force in at least one direction. The at least one direction sensitive magnetic field sensor L is in particular arranged to have a predetermined and fixed spatial coordination with the respective load sensor pin 8, 9.

The load sensor pin 8, 9 includes the at least one direction sensitive magnetic field sensor L is at least partially hollow. The at least one direction sensitive magnetic field sensor L is arranged inside the interior of the pin 8, 9.

The first through-hole 3 and the third through-hole 6 are configured such that they encompass the first load sensor pin 8 in a positive-fitting manner. In other words, the first load sensor pin 8 extends through the first and third through-holes 3, 6, and the first load sensor pin 8 is supported in at least two rotational degrees of freedom and at least two translational degrees of freedom by abutting surfaces of the through-holes.

The second load sensor pin 9 is encompassed by the second through-hole 4 in a positive-fitted manner. In other words, the second load sensor pin 9 extends through the second through-hole 4, and the second load sensor pin 9 is supported in at least two rotational degrees of freedom and at least two translational degrees of freedom by abutting surfaces of the second through-hole 4.

The fourth through-hole 7 is configured such that the second load sensor pin 9 has one additional degree of freedom of movement (compared to the first load sensor pin 8 in the third through-hole 6) within the fourth through-hole 7. Differently stated, the second load sensor pin 9 extends through fourth through-hole 7, and the second load sensor pin 9 is supported in at least two rotational degrees of freedom and at least one translational degree of freedom by abutting surfaces of the through-holes. The number of translational degrees of freedom of the second load sensor pin 9 in the fourth through-hole 7 is one more than the number of translational degrees of freedom of the first load sensor pin 8 the third through-hole 6.

The additional degree of freedom is a translational degree of freedom that extends in the longitudinal x-axis direction.

The first portion 2 has a yoke-like shape, wherein yoke legs 11 of the first portion comprise the first through-hole 3 and second through-hole 4. The second portion 5 has a tubular shape, wherein side walls and/or a center wall of the second portion 5 comprise the third through-hole 6 and the fourth through-hole 7.

The direction sensitive magnetic field sensor is (or the direction sensitive magnetic field sensors are) configured to detect force components of shear forces introduced into the load sensor pins 8, 9 by the first portion 2 and the second portion 5.

The first and/or second load sensor pin 8, 9 is fixedly attached (in all six degrees of freedom in a predetermined manner to the first portion 2. Bolts 12 screw the load sensor pins 8, 9 (via attachment flanges of the pins) to yoke legs 11 of the first portion 2.

The second portion 5 includes a center wall 13 extending in the longitudinal x-axis direction and the vertical z-axis direction, the third through-hole 6 and fourth through-hole 7 extend through the center wall 13 (as best seen in FIG. 29).

The first portion 2 has a yoke-like shape, wherein the yoke legs 11 of the first portion 2 comprise the first and second through-holes 3, 4, and wherein the center wall includes the third and fourth through-holes 6, 7.

Direction sensitive magnetic field sensor(s) L is/are configured to detect force components of shear forces introduced into the load sensor pins 8, 9 by the first portion 2 and the second portion 5.

Side walls 14 of the second portion 5 comprise through-holes in side walls that are larger than the third and fourth through-holes 6, 7, such that the shear forces are introduced into the load sensor pins 8, 9 by abutment surfaces of the first and second through-holes 3, 4 in the yoke legs 11 and abutment surfaces of the third and fourth through-holes 6, 7 in the center wall 13.

The tow coupling apparatus 100 includes the sensor assembly 1. The first portion 2 is a tow coupling apparatus that is attached to a hitch tube 101 of a towing vehicle.

The second portion 5 is a receiving tube that is configured to receive a drawbar 102 (hitch bar, ball mount) of the tow coupling apparatus 100. The drawbar 102 can be partially inserted into the second portion 5. A pin 103 secures the drawbar 102 to the second portion 5.

Turning now to FIG. 30, shown therein is a simplified, cross-sectional view diagram of another tow hitch sensor assembly including first and second load sensor pins 8, 9 extend through the first through-hole 3 and the second through-hole 4 in the first portion 2 and through the third through-hole 6 and the fourth through-hole 7 in the second portion 5. The first and/or second load sensor pins 8, 9 is an at least partially hollow pin that may be sealed by a front cover 15 and a rear cover 16. The rear cover 16 may provide a cable bushing to provide access for supply and/or signal lines 17. The load sensor pins 8, 9 include a plurality of direction sensitive field sensors L. A printed circuit board 18 supports the direction sensitive field sensors L. The load sensor pins 8, 9 can include one or more collars 19 of comparatively low magnetic permeability (compared to the hollow shaft of the load sensor pins 8, 9) arranged such that the positions of the one or more collars 19 substantially correspond to one or more of the positions of the through-holes 3, 4, 6, 7 in the first and/or second portion. Alternatively, one or more of the through-holes 3, 4, 6, 7 can comprise a collar/bushing 19 of comparatively low magnetic permeability (compared to the hollow shaft of the load sensor pins 8, 9). The first portion 2 and the second portion 5 may be configured to provide a gap between the first portion 2 and the second portion 5. The gap may comprise a material of low magnetic permeability (compared to the hollow shaft of the load sensor pins 8, 9).

Turning now to FIG. 31A and FIG. 31B, shown therein are a simplified, partial, cross-sectional plan and end view diagrams of another configuration of the load sensor pins 8, 9 as used in, for example, the tow coupling apparatus of FIG. 30. The first and/or the second load sensor pin 8, 9 includes at least one respective first x-axis direction sensitive magnetic field sensor Lx11, Lx12 configured to detect a force component Fx1 in the first magneto-elastically active region 21 in the longitudinal x-axis direction. The first and/or the second load sensor pins 8, 9 includes at least one respective second x-axis direction sensitive magnetic field sensor Lx21, Lx22 configured to detect a force component Fx2 in the second magneto-elastically active region 22 in the longitudinal x-axis direction. The first and/or the second load sensor pins 8, 9 includes at least one respective first z-axis direction sensitive magnetic field sensor Lz11, Lz12 configured to detect a force component Fz1 in the first magneto-elastically active region 21 in the vertical x-axis direction. The first and/or the second load sensor pins 8, 9 includes at least one second z-axis direction sensitive magnetic field sensor Lz21, Lz22 configured to detect a force component Fz2 in the second magneto-elastically active region in the vertical z-axis direction.

The sensor means includes at least four magnetic field sensors L having a first to fourth sensing direction, wherein the sensing directions and a shaft axis A (FIGS. 32A and 32B) are at least substantially parallel to each other. The first to fourth magnetic field sensors are arranged along the circumference of the load sensor pin 8, 9 having substantially equal distances in circumferential direction between each other.

The at least one magneto-elastically active regions 21, 22 project along a circumference of the respective load sensing pin 8, 9, wherein the regions are magnetized in such a way that the domain magnetizations in the magnetically polarized regions 21, 22 are in a circumferential direction of the member.

Turning now to FIG. 32A and FIG. 32B, shown therein are simplified, partial, axial, cross-sectional view diagrams of a load sensor pin 8, 9 for use in a tow coupling apparatus, in which a sensor assembly 1 has a first portion 2 coupled to a second portion 5 via the load sensor pins 8, 9. The first portion 2, which may correspond to the adapter 904, is subject to a first shear force FS1 pointing to the left. The second portion 5, which may correspond to the bracket 902, is exposed to a second and opposite shear force FS2, pointing to the right. The load sensor pin 8, 9 includes a magneto-elastically active region 21, which is arranged at the transition between the first and the second portion 2, 5. Consequently, the active region 21 is subject to shear forces causing the magnetic flux emanating from the magnetically polarized region of said active region 21 to become increasingly helically shaped, when the shear forces FS1, FS2 increase. The sensor means of the load sensor pins 8, 9 includes four direction sensitive magnetic field sensors Lx1, Lx2, Lz1, Lz2 being arranged along the inner circumference of the load sensor pin 8, 9.

The first direction sensitive sensor Lx1 and the third direction sensitive sensor Lx2 form a first group of magnetic field sensors.

The second group of sensors consists of the second direction sensitive sensor Lz1 and the fourth direction sensitive sensor Lz2.

The sensing direction Sx1 of the first sensor Lx is 180 degrees opposite to the third sensing direction Sx2 of the third sensor Lx2.

The first sensing direction Sx1 points out of the paper plane, the third sensing direction Sx2 points into the paper plane.

Similar to the first group of sensors Lx1, Lx2, the second sensing direction Sz1 and the fourth sensing direction Sz2 are 180 degrees opposite to each other.

The second and fourth sensor Lz1, Lz2 are arranged accordingly.

As it is indicated using the commonly known direction signs, the second sensing direction Sz1 points out of the paper plane while the fourth sensing direction Sz2 is directed into the paper plane.

The second sensor Lz1 (having the second sensing direction Sz1) and the fourth sensor Lz2 (having the fourth sensing direction Sz2) are shown.

The first sensor Lx1 and the first sensing direction Sx1 are shown solely for clarification of the configuration of the sensors. Naturally, the first sensor Lx1 is not arranged in a common plane with the second and fourth sensor Sz1, Sz2.

FIG. 32B shows a simplified cross section of a load sensor pin 10 according to another embodiment, which includes a first or upper member 11, which is coupled to a second or lower member 12 via the shaft like member 4. The upper member 11 is subject to a first shear force FS1 pointing to the left. The lower member 12 is exposed to a second and opposite shear force FS2, pointing to the right. The shaft like member 4 includes an active region 6, which is arranged at the transition between the upper and lower member 11, 12. Consequently, the active region 6 is subject to shear forces causing the magnetic flux emanating from the magnetically polarized region of said active region 6 to become increasingly helically shaped, when the shear forces FS1, FS2 increase. The sensor means of the load sensor pin 10 includes four direction sensitive magnetic field sensors LX1, LX2, LY1, LY2 being arranged along the inner circumference of the shaft like member 4.

Turning now to FIG. 33, shown therein is a simplified, cross-sectional view diagram of some of the components of a tow coupling apparatus in which the first portion 2 surrounds the second portion 5, which is exposed to a force F. The load sensor pin 8, 9 intersects the first and the second portions 2, 5 along the shaft axis A. The load sensor pin 8, 9 includes a first magneto-elastically active region 261 and a second magneto-elastically active region 262. Similar to the other embodiments of the invention, these regions are directly or indirectly attached to or form a part of the load sensor pin 8, 9 in such a manner that the mechanic stress is transmitted to the active regions 261, 262. The active regions 261, 262 are magnetically polarized in opposite circumferential directions, P61, P62, which are substantially 180 degrees opposite to each other. Furthermore, the directions of polarizations are substantially perpendicular to the shaft axis A.

A first pair of magnetic field sensors comprising a first sensor L1 and a second sensor L2 arranged inside the load sensor pin 8, 9 in that this pair of sensors cooperates with the first active region 261. Similar, a second pair of magnetic field sensors comprising a first and a second sensor L1* and L2* arranged inside the load sensor pin 8, 9 so as to interact with the second active region 262. The sensors L1, L2 of the first pair and the sensors L1*, L2* of the second pair are arranged approximate the first and the second magneto-elastically active region 261, 262, respectively. The first sensor pair L1, L2 outputs a first signal S, which is illustrated as a voltage V varying with the applied force F in the lower left of FIG. 33. The signal S corresponds to a stress-induced magnetic flux emanating from the first magnetically polarized region 261.

Similarly, the second pair of magnetic sensors L1*, L2* outputs a second signal S* corresponding to a stress-induced magnetic flux emanating from the second magnetically polarized region 262. This signal S* is also a voltage V* varying with the applied F (see lower right of FIG. 33). However, the slope of the second signal S* is opposite to that of the first signal S. A control unit (not shown) of the magneto-elastic sensor assembly is configured for determination of the force F inducing a stress in the load sensor pin 8, 9. The control unit performs a differential evaluation of the signals S and S* of the first pair of sensors L1, L2 and the second pair of sensors L1*, L2*. This differential evaluation advantageously doubles the sensitivity of the signal, which is correlated with the applied stress. Because the polarization P61 and P62 of the first and second magnetically active region 261, 262 is opposite to each other, theoretically possible external fields are compensated. The magneto-elastic sensor assembly according to this embodiment is more sensitive and less susceptible to errors.

Advantageously, all embodiments of the invention may be equipped with the sensor configuration of FIG. 33 having separate, oppositely polarized active regions 261, 262 and two corresponding sets i.e. pairs of sensors L1, L2 and L1*, L2*.

Furthermore, the embodiment of FIG. 8 may be equipped with the sensor configuration, which is known from the load pin in FIG. 31B. In other words, the sensor pairs L1, L2 and L1*, L2* may be replaced by a sensor configuration having four sensor pairs Lx11/Lx12, Lx21/Lx22, Lz11/Lz12, Lz21/Lz22. According to this particular embodiment of the invention, additional force vectors may be determined.

Turning now to FIG. 34, shown therein is a simplified, side, plan view diagram of a portion of the vehicle tow coupling apparatus of FIGS. 28A and 28B showing a first simplified load case. In particular, shown therein are the forces associated with the simplified load case. A force F has a vertical force component Fz in the vertical z-axis direction. The force F is applied to the sensor assembly via the second portion 5, and more precisely via the ball coupling 104 of the drawbar 102. For determining the force component Fz the following set of equations are solved:

Fz*d1=Fz1*d2 (10)
Fz*d3=Fz2*d2 (11)
Fz=Fz1+Fz2 (12)
d1=Fz1*d2/(Fz1+Fz2) (13)
d3=Fz2*d2/(Fz1+Fz2) (14)

Fz1 is a reaction force on the first load sensor pin 8, Fz2 is a reaction force on the second load sensor pin 9. Distance d2 is the distance between (the axes of) the first and the second load sensor pins 8, 9. Distance d1 is the distance between the point of load (the ball coupling 104) and (the axis of) the second load sensor pin 9. Distance d3 is the distance between the point of load and (the axis of) the first load sensor pin 8. An algorithm for solving the above equations may be embedded in/on the memory of one of the aforementioned printed circuit board 304, 604.

Turning now to FIG. 35, shown therein is a simplified, top view diagram of a portion of a vehicle tow coupling apparatus showing another simplified load case. The force has a transversal force component Fy in the transversal y-axis direction applied to the sensor assembly 1 via the second portion 5, and more precisely via the ball coupling 104 of the drawbar 102. The fourth through-hole 7 provides a degree of freedom in the longitudinal x-axis direction. The transversal force component Fy creates a first reactive force Fx2 acting in the longitudinal x-axis direction on the first magneto-elastically active region 21 of the first load sensor pin 8, and a second reactive force Fx1 acting in the longitudinal x-axis direction on the second magneto-elastically active region 22 of the first load sensor pin 8. For determining the force component Fy, the following set of equations are solved:

Fy*d3=Fx1*d2 (15)
Fy*d3=Fx2*d2 (16)
Fx1=−Fx2 (17)

Turning now to FIG. 36, shown therein is a simplified, top view diagram of a portion of a vehicle tow coupling apparatus showing another simplified load case. In this case, the force has a longitudinal force component Fx in the longitudinal x-axis direction applied to the to the sensor assembly 1 via the second portion 5, and more precisely via the ball coupling 104 of the drawbar 102. The fourth through-hole 7 provides a degree of freedom in the longitudinal x-axis direction. The longitudinal force component Fx creates a first reactive force F2 acting in the longitudinal x-axis direction on the first magneto-elastically active region 21 of the first load sensor pin 8, and a second reactive force F1 acting in the longitudinal x-axis direction on the second magneto-elastically active region 22 of the first load sensor pin 8. For determining the force component Fx, the following equation is solved:

Fx=Fx1+Fx2 (18)

Turning now to FIG. 37, shown therein is a simplified, cross-sectional end view and plan side view diagram of a vehicle tow coupling apparatus subject to a vertical load component, Fz of a load F. The first load sensor pin 8 includes a first magneto-elastically active region 21 and a second magneto-elastically active region 22 (as shown in FIG. 36) that are directly or indirectly attached to or form parts of the first load sensor pin 8 in such a manner that mechanic stress that is applied to the first load sensor pin 8 is transmitted to the magneto-elastically active regions 21, 22. Each magneto-elastically active region 21, 22 includes a magnetically polarized region. The magnetic polarization of the first magneto-elastically active region 21 and the magnetic polarization of the second magneto-elastically active region 22 can be substantially opposite to each other.

A magnetic field sensor means includes at least one first direction sensitive magnetic field sensor Lz11 being arranged approximate the first magneto-elastically active region for outputting a first signal corresponding to a stress-induced magnetic flux emanating from the first magnetically polarized region 21, and at least one second direction sensitive magnetic field sensor Lz21 being arranged approximate the second magneto-elastically active region 22 for outputting a second signal corresponding to a stress-induced magnetic flux emanating from the second magnetically polarized region 22.

The first load sensor pin 8 includes:

a) a first and a third z-axis direction sensitive magnetic field sensor Lz11, Lz12 configured to detect a force component Fz1 in the first magneto-elastically active region 21 in the vertical z-axis direction; and

b) a second and a fourth z-axis direction sensitive magnetic field sensor Lz21, Lz22 configured to detect a force component Fz2 in the second magneto-elastically active region in the vertical z-axis direction.

The second load sensor pin 9 is a naked pin, i.e. the pin has no magneto-elastically active region and no direction sensitive magnetic field sensors. Differently stated, the first load sensor pin 8 includes at least one first z-axis direction sensitive magnetic field sensor Lz11 and at least one second z-axis direction sensitive magnetic field sensor Lz21.

The first and second load sensor pins 8, 9 are rigidly fixed within the first and second through-holes 3, 4 of the first portion 2 (as shown in FIG. 36). The third and the fourth through-holes 6, 7 can provide a minimal gap between the abutment surfaces of the second portion 5 and the first and second load sensor pins 8, 9.

Turning now to FIG. 38, shown therein is a simplified, cross-sectional end view and plan side view diagram of a vehicle tow coupling apparatus subject to a vertical, transversal, and longitudinal load components of a load F. In this view, a first load sensor pin 8 includes a first magneto-elastically active region 21 and a second magneto-elastically active region 22, which are directly or indirectly attached to or form parts of the first load sensor pin 8 in such a manner that mechanic stress that is applied to the first load sensor pin 8 is transmitted to the magneto-elastically active regions 21, 22. Each magneto-elastically active region 21, 22 includes a magnetically polarized region. The magnetic polarization of the first magneto-elastically active region 21 and the magnetic polarization of the second magneto-elastically active region 22 can be substantially opposite to each other.

A magnetic field sensor means includes at least one first and third direction sensitive magnetic field sensor Lx11, Lz11 being arranged approximate the first magneto-elastically active region for outputting a first signal and a third signal corresponding to a stress-induced magnetic flux emanating from the first magnetically polarized region 21. The magnetic sensor means further includes at least one second and fourth direction sensitive magnetic field sensor Lx21, Lz21 being arranged approximate the second magneto-elastically active region 22 for outputting a second signal and a fourth signal corresponding to a stress-induced magnetic flux emanating from the second magnetically polarized region 22.

The first load sensor pin 8 may include:

a) a first and a third z-axis direction sensitive magnetic field sensor Lz11, Lz12 configured to detect a vertical force component Fz11 in the first magneto-elastically active region 21 in the z-axis vertical direction;

b) a second and a fourth z-axis direction sensitive magnetic field sensor Lz21, Lz22 configured to detect a vertical force component Fz12 in the second magneto-elastically active region in the z-axis vertical direction;

c) a first and a third x-axis direction sensitive magnetic field sensor Lx11, Lx12 configured to detect a longitudinal force component Fx2 in the first magneto-elastically active region 21 in the longitudinal x-axis direction; and

d) a second and a fourth x-axis direction sensitive magnetic field sensor Lx21, Lx22 configured to detect a longitudinal force component Fx1 in the second magneto-elastically active region in the longitudinal x-axis direction.

The second load sensor pin 9 may include:

a) a first and a third z-axis direction sensitive magnetic field sensor Lz11, Lz12 configured to detect a vertical force component Fz21 in the first magneto-elastically active region 21 in the vertical z-axis direction; and

b) a second and a fourth z-axis direction sensitive magnetic field sensor Lz21, Lz22 configured to detect a vertical force component Fz22 in the second magneto-elastically active region in the vertical z-axis direction;

Differently stated, the first load sensor pin 8 includes at least one first x-axis direction sensitive magnetic field sensor Lx11, at least one second x-axis direction sensitive magnetic field sensor Lx21, at least one first z-axis direction sensitive magnetic field sensor Lz11, and the at least one second z-axis direction sensitive magnetic field sensor Lz21. The second load sensor pin 9 includes at least one first z-axis direction sensitive magnetic field sensor Lz11 and at least one second z-axis direction sensitive magnetic field sensor Lz21.

As previously described, the first and second load sensor pins 8, 9 are rigidly fixed within the first and second through-holes 3, 4 of the first portion 2. The third and the fourth through-holes 6, 7 can provide a minimal gap between the abutment surfaces of the second portion 5 and the first and second load sensor pins 8, 9.

Turning now to FIG. 39, shown therein is another simplified, cross-sectional end view and plan side view diagram of a vehicle tow coupling apparatus subject to a vertical, transversal, and longitudinal load components of a load F. In this view, a first load sensor pin 8 includes a first magneto-elastically active region 21 and a second magneto-elastically active region 22, which are directly or indirectly attached to or form parts of the first load sensor pin 8 in such a manner that mechanic stress that is applied to the first load sensor pin 8 is transmitted to the magneto-elastically active regions 21, 22. Each magneto-elastically active region 21, 22 includes a magnetically polarized region. The magnetic polarization of the first magneto-elastically active region 21 and the magnetic polarization of the second magneto-elastically active region 22 can be substantially opposite to each other.

The magnetic field sensor means of this embodiment includes at least one first and third direction sensitive magnetic field sensor Lx11, Lz11 being arranged approximate the first magneto-elastically active region for outputting a first signal and a third signal corresponding to a stress-induced magnetic flux emanating from the first magnetically polarized region 21. The magnetic sensor means further includes at least one second and fourth direction sensitive magnetic field sensor Lx21, Lz21 being arranged approximate the second magneto-elastically active region 22 for outputting a second signal and a fourth signal corresponding to a stress-induced magnetic flux emanating from the second magnetically polarized region 22.

The first load sensor pin 8 includes:

c) a first and a third x-axis direction sensitive magnetic field sensor Lx11, L12 configured to detect a longitudinal force component Fx2 in the first magneto-elastically active region 21 in the longitudinal x-axis direction; and

The second load sensor pin 9 includes:

c) a first and a third x-axis direction sensitive magnetic field sensor Lx11, L12 configured to detect a longitudinal force component Fx10 (force exerted by the load sensor pin 9 in contact with a top surface of the through-hole) in the first magneto-elastically active region 21 in the longitudinal x-axis direction; and

d) a second and a fourth x-axis direction sensitive magnetic field sensor Lx21, Lx22 configured to detect a longitudinal force component Fx20 (force exerted by the load sensor pin 9 in contact with a top surface of the through-hole) in the second magneto-elastically active region 22 in the longitudinal x-axis direction.

Therefore, the configuration of the second load sensor pin 9 is substantially similar to the configuration of the first load sensor pin 8. Differently stated, the first load sensor pin 8 includes at least one first x-axis direction sensitive magnetic field sensor Lx11, at least one the second x-axis direction sensitive magnetic field sensor Lx21, at least one first z-axis direction magnetic field sensor Lz11, and at least one second z-axis direction magnetic field sensor Lz21. The second load sensor pin includes at least one first x-axis direction sensitive magnetic field sensor Lx11, at least one second x-axis direction sensitive magnetic field sensor Lx21, at least one first z-axis direction magnetic field sensor Lz11, and at least one second z-axis direction magnetic field sensor Lz21.

The first and the second longitudinal force components Fx10, Fx20 are comparatively small (for example, resulting from friction between the abutment surface of the fourth through-hole 7 and the second load sensor pin 9) or substantially zero. This is a direct result of the additional translational degree of freedom in the longitudinal x-axis direction, which degree of freedom is provided by the fourth through-hole 7 in the second portion 5.

The first and second load sensor pins 8, 9 are rigidly fixed within the first and second through-holes 3, 4 of the first portion 2. The third and the fourth through-holes 6, 7 can provide a minimal gap between the abutment surfaces of the second portion 5 and the first and second load sensor pins 8, 9.

Turning now to FIG. 40, shown therein is a simplified, cross-sectional end view and plan side view diagram of a vehicle tow coupling apparatus subject to a vertical, transversal, and longitudinal load components of a load F. In this view, the first load sensor pin 8 includes a first magneto-elastically active region 21 and a second magneto-elastically active region 22, which are directly or indirectly attached to or form parts of the first load sensor pin 8 in such a manner that mechanic stress that is applied to the first load sensor pin 8 is transmitted to the magneto-elastically active regions 21, 22. Each magneto-elastically active region 21, 22 includes a magnetically polarized region. The magnetic polarization of the first magneto-elastically active region 21 and the magnetic polarization of the second magneto-elastically active region 22 can be substantially opposite to each other.

A magnetic field sensor means includes at least one first- and third-direction sensitive magnetic field sensor Lx11, Lz11 being arranged approximate the first magneto-elastically active region 21 for outputting a first signal and a third signal corresponding to a stress-induced magnetic flux emanating from the first magnetically polarized region 21. The magnetic sensor means further includes at least one second- and fourth-direction sensitive magnetic field sensor Lx21, Lz21 being arranged approximate the second magneto-elastically active region 22 for outputting a second signal and a fourth signal corresponding to a stress-induced magnetic flux emanating from the second magnetically polarized region 22.

The first load sensor pin 8 includes:

The second load sensor pin 9 includes:

c) a first and a third x-axis direction sensitive magnetic field sensor Lx11, L12 configured to detect a longitudinal force component Fx22 in the first magneto-elastically active region 21 in the longitudinal x-axis direction; and

d) a second and a fourth x-axis direction sensitive magnetic field sensor Lx21, Lx22 configured to detect a longitudinal force component Fx21 in the second magneto-elastically active region 22 in the longitudinal x-axis direction.

The general configuration of the second load sensor pin 9 is substantially similar to the configuration of the first load sensor pin 8. The first and second load sensor pins 8, 9 are rigidly fixed within the first and second through-holes 3, 4 of the first portion 2. The third and the fourth through-holes 6, 7 can provide a minimal gap between the abutment surfaces of the second portion 5 and the first and second load sensor pins 8, 9. Optionally, the fourth through-hole 7 can provide no minimal gap, such that the second load sensor pin 9 is rigidly fixed within the third and the fourth through-hole 7.

Turning now to FIG. 41, shown therein is another a simplified, cross-sectional end view and plan side view diagram of a vehicle tow coupling apparatus subject to a vertical, transversal, and longitudinal load components of a load F. In this view, the first load sensor pin 8 comprises a first magneto-elastically active region 21 and a second magneto-elastically active region 22, which are directly or indirectly attached to or form parts of the first load sensor pin 8 in such a manner that mechanic stress that is applied to the first load sensor pin 8 is transmitted to the magneto-elastically active regions 21, 22. Each magneto-elastically active region 21, 22 comprises a magnetically polarized region. The magnetic polarization of the first magneto-elastically active region 21 and the magnetic polarization of the second magneto-elastically active region 22 can be substantially opposite to each other.

A magnetic field sensor means includes at least one first direction sensitive magnetic field sensor Lz11 being arranged approximate the first magneto-elastically active region for outputting a first signal corresponding to a stress-induced magnetic flux emanating from the first magnetically polarized region 21. The magnetic sensor means further includes at least one second direction sensitive magnetic field sensor Lz21 being arranged approximate the second magneto-elastically active region 22 for outputting a second signal and a fourth signal corresponding to a stress-induced magnetic flux emanating from the second magnetically polarized region 22.

The first load sensor pin 8 includes:

The first load sensor pin 8 comprises no x-axis direction sensitive magnetic field sensors.

The second load sensor pin 9 includes:

c) a first and a third x-axis direction sensitive magnetic field sensor Lx11, Lx12 configured to detect a longitudinal force component Fx22 in the first magneto-elastically active region 21 in the longitudinal x-axis direction; and

The first and second load sensor pins 8, 9 are rigidly fixed within the first and second through-holes 3, 4 of the first portion 2. The third and the fourth through-hole 6, 7 can provide a minimal gap between the abutment surfaces of the second portion 5 and the first and second load sensor pins 8, 9. Optionally, the fourth through-hole 7 can provide no minimal gap, such that the second load sensor pin 9 is rigidly fixed within the third and the fourth through-hole 7.

Turning now to FIG. 42A, shown therein is a simplified, perspective, schematic view diagram of tow coupling apparatus 100 using load sensor pins 8, 9 for sensing (components) of a force F. In the configuration shown, the sensor assembly 1 for sensing a force F includes a first portion 2 (attachment assembly, supporting yoke) having a first and a second through-hole 3, 4, and a second portion 5 (trailer hitch, towing hook) having a third and fourth through-hole 6, 7. The third and fourth through-holes 6, 7 are positioned in correspondence to the first and second through-holes 3, 4.

The sensor assembly 1 further includes a first load sensor pin 8 and a second load sensor pin 9. The first load sensor pin 8 is arranged such that it extends through the first and third through-holes 3, 6. The second load sensor pin 9 is arranged such that it extends through the second and fourth through-holes 4, 7.

The first portion 2 is coupled to the second portion 5 via the first and second load sensor pins 8, 9. At least one out of the first and the second load sensor pin 8, 9 includes at least one magneto-elastically active region 10 that is directly or indirectly attached to or forms a part of the load sensor pin 8, 9 in such a manner that mechanic stress on the load sensor pin is transmitted to the magneto-elastically active region. The magneto-elastically active region 10 comprises at least one magnetically polarized region such that a polarization of the polarized region becomes increasingly helically shaped as the applied stress increases.

The at least one load sensor pin 8, 9 further includes a magnetic field sensor means arranged approximate the at least one magneto-elastically active region 10 for outputting a signal corresponding to a stress-induced magnetic flux emanating from the magnetically polarized region. The magnetic field sensor means includes at least one direction sensitive magnetic field sensor L, which is configured for determination of a shear force in at least one direction. The at least one direction sensitive magnetic field sensor L is arranged to have a predetermined and fixed spatial coordination with the load sensor pin 8, 9.

The load sensor pin 8, 9 comprising the at least one direction sensitive magnetic field sensor L is at least partially hollow. The at least one direction sensitive magnetic field sensor L is arranged inside the interior of the load sensor pin 8, 9.

The first and second load sensor pins 8, 9 are substantially arranged along the vertical z-axis direction. The load sensor pins 8, 9 extend in the transversal y-axis direction. The longitudinal direction is perpendicular to the vertical z-axis direction and the transversal y-axis direction to define the Cartesian coordinate system. The system of equations that has to be solved in order to determine the respective load components of F, has to be altered accordingly.

Further features and aspects of the invention (which have been described with respect to the preceding embodiments) may also apply to this embodiment.

The sensor assembly 1 is part of a tow coupling apparatus 100. The first part 2 is configured to be attached to the chassis of a towing vehicle. The second part 5 provides a ball coupling 104 that is configured to couple to a towed vehicle.

Turning now to FIG. 42B and FIG. 42C, shown therein are simplified, perspective, schematic view diagrams of tow coupling apparatus 100 using load sensor pins 8, 9 for sensing (components) of a force F. In these embodiments, the load sensor pins 8, 9, along with the first part 2 and second part 5 (not shown), are integrated into the existing hitch mechanism with the load sensor pins 8, 9 arrange in the transverse y-axis direction (perpendicular to the force F acting in the x-axis direction).

Turning now to FIG. 42D through FIG. 42K, shown therein are simplified, perspective, schematic view diagrams of tow coupling apparatus 100 using load sensor pins 8, 9 for sensing (components) of a force F. In these embodiments, the load sensor pins 8, 9, along with the first part 2 and second part 5 (not shown), are integrated into the existing hitch mechanism with the load sensor pins 8, 9 arrange in the transverse y-axis direction as shown (perpendicular to the force F acting in the x-axis direction). In some cases, an exterior housing further protects the components of the tow coupling apparatus 100 from rain, snow, ice, and other environment conditions.

Turning now to FIG. 42L and FIG. 420, shown therein is a simplified, perspective, schematic view diagram of tow coupling apparatus 100 using load sensor pins 8, 9 for sensing (components) of a force F. In these embodiments, the load sensor pins 8, 9, along with the first part 2 and second part 5 (not shown), are integrated into the existing hitch mechanism with the load sensor pins 8, 9 arrange in the longitudinal x-axis direction as shown (parallel to the force F acting in the x-axis direction). Other load sensing pins 8, 9 could be positioned in the transverse direction to better measure the Fx force in the x-axis direction.

Turning now to FIG. 42P, shown therein is a simplified, perspective, schematic view diagram of coupling devices (“kingpin,” extender, 3-inch ball, high-rise ball, inverted ball, and eyelet for use with a gooseneck-style trailer hitch (not shown), and fifth wheel-style hitch) adapted to using one or more load sensor pins 8, 9 for sensing (components) of a force F acting on the coupling devices. FIG. 42Q through FIG. 42U show one of the coupling devices of FIG. 42P and the locations for positioning the load sensor pins 8, 9 (usually in the transverse direction) for sensing (components) of a force F acting on the coupling devices. As shown, the coupling devices may include a hitch tube (which may be a solid bar) attached to a towing vehicle, a receiver tube attached to the hitch tube/bar, a drawbar (which may be straight, curved) inserted in the receiver tube or attached directly to the hitch tube/bar, and a ball hitch.

Turning now to FIG. 42V, shown therein is a simplified, exploded, schematic view diagram of a weight sensor assembly 410 using load sensor pins 8, 9 for sensing a weight of a towed and a towing vehicle for comparison to a predetermined value, such as a manufacturer's maximum weight limit or a US governmental gross vehicle weight rating (GVWR). A “sprung weight” is the weight of a mass resting on the suspension of a vehicle or a trailer, not the total weight (the total weight would include the wheels, tires, brakes, and certain suspension components). As shown in the figure, the load sensor pins 8, 9 are positioned such that the sheer force exerted downward by the connection device 412 (which could be a chassis or vehicle body part) and transferred to the vehicle wheels causes a force to be applied to the load pins 8, 9. The bracket 902, which may be connected to the spring or other suspension component on the one end, and adapters 904, which may be attached to the connection device 412 and the towing or the towed vehicle chassis, may be used to output a signal (as described above) that approximates the sprung weight by measuring the force of the mass of the vehicle as its weight force is transferred to the load sensor pins 8, 9. For example, the sensor assembly 410 could be positioned between the top of each of the four suspension springs associated with the wheels where the springs attach to the vehicle chassis.

FIGS. 42W through 42AA show various towed vehicles and towing vehicles and related components, including suspension components, equipped with the weight sensor assembly 410 at various measurement points between a vehicle body or vehicle load (e.g., trailer box, boat) and the vehicle's wheels to measure a sprung weight force.

FIG. 42W for example, illustrates use of the weight sensor assembly 410 positioned near a trailer wheel such that the weight sensor assembly 410 is between the trailer box on one end and the wheel axel (or wheel suspension component attached to the wheel), such that the weight of the trailer box may be measured from a force arising from the weight of the trailer box being transferred to the load sensor pins 8, 9. FIG. 42X illustrates a similar use of the weight sensor assembly 410 on a smaller trailer.

FIG. 42Y illustrates use of the weight sensor assembly 410 positioned near a trailer wheel of a boat trailer such that the weight sensor assembly 410 is between the trailer on one end and the wheel axel (or wheel suspension component attached to the wheel), such that the weight of the boat and boat trailer may be measured from a force arising from the weight of the boat and boat trailer being transferred to the load sensor pins 8, 9.

FIG. 42Z illustrates use of the weight sensor assembly 410 positioned near the three connection points of a leaf spring of a vehicle such that a weight sensor assembly 410 is between each of the two ends of the leaf spring and the vehicle body above, and another weight sensor assembly 410 is between the middle of the leaf spring and the wheel axel, such that the weight of the vehicle body may be measured from respective forces arising from the weight of the body being transferred to the load sensor pins 8, 9 associated with the three weight sensor assemblies 410.

FIG. 42AA illustrates use of the weight sensor assembly 410 positioned near two connection points of a vehicle suspension device such that one weight sensor assembly 410 is between the top of a spring and the vehicle body above, and the other weight sensor assembly 410 is between the bottom of the spring and a vehicle wheel, such that the weight of the vehicle body may be measured from respective forces arising from the weight of the body being transferred to the load sensor pins 8, 9 associated with the weight sensor assemblies 410.

A method of using the sensor assembly 410 and the components shown in the various embodiments described above include connecting the electronics of the load sensor pins 8, 9 to an electrical connection point of the towed and/or the towing vehicle such that electrical signals having information useful for calculating the (components) of a force F or having information about a calculated force F may be transferred to the vehicles. The signals may be transferred by wired or wirelessly using a transceiver associated with the towing or towed vehicle. The method further includes continuously comparing the calculated force F (and its components) to one or more ratings or limits and outputting an alert if a calculated values exceeds the ratings or limits. Ratings and limits may be expressed in terms of maximum values, maximum values with a safety margin, or a distribution of values, such as a histogram, that account for inputs from other vehicle sensors and operating conditions that affect the ratings and limits (e.g., external air temperature, vehicle traction setting, engine performance, tire pressure, payload amount (including number of vehicle passengers), and others.

EXAMPLE

A computation for a tow vehicle is shown below:

Gwc (weight-carrying hitch rating)=12,500 lbs

Gvm (Gross Vehicle Mass (GVWR)−Max Payload w/Weight Truck)=7,850 lbs

D=Gwc*(Gvm+5004.5)/(Gvm+Gwc)=1875 lbs

Twc=1875 lbs

Longitudinal (Aft/Fore) Loads

Aft (toward rear):

5922 lbs (0-100 cycles)

4738 lbs (101-500 cycles)

3948 lbs (501-5000 cycles)

Fore (toward front):

−2685 lbs (0-100 cycles)

−2685 lbs (101-500 cycles)

−1579 lbs (501-5000 cycles)

Vertical (Up/Down) Loads

Up (toward sky)

−296 lbs (0-100 cycles)

−454 lbs (101-500 cycles)

−612 lbs (501-5000 cycles)

Down (toward Earth)

−3217 lbs (0-100 cycles)

−3059 lbs (101-500 cycles)

−2901 lbs (501-5000 cycles)

Starting at −1875 lbs (cycling between the loads mentioned above)

Lateral (Side to Side) Loads

Side (+/−)=790 lbs (Cycle at 1 Hz for 60,000 cycles in conjunction w/known histogram distribution)

Although certain presently preferred embodiments of the disclosed invention have been specifically described herein, it will be apparent to those skilled in the art to which the invention pertains that variations and modifications of the various embodiments shown and described herein may be made without departing from the spirit and scope of the invention. Accordingly, it is intended that the invention be limited only to the extent required by the appended claims and the applicable rules of law.

Claims

1. A load sensing pin for outputting a signal containing information for determining an amount and direction of force acting on a tow coupling comprising: an elongated generally cylindrically hollow and elastically deformable shaft-like member having at least two magneto-elastically active regions directly or indirectly attached to or forming a part of the member at longitudinally spaced apart locations between respective ends of the member, wherein each of the active regions possess a remanent magnetic polarization that becomes increasingly helically shaped when a mechanical stress on the member, transmitted to the magneto-elastically active regions, increases; anda printed circuit board processor, the processor being adapted to receiving signals from at least one magnetic field sensor device arranged proximate to each of the magneto-elastically active regions and from at least one secondary magnetic field sensor,wherein the at least one magnetic field sensor device includes at least one direction-sensitive magnetic field sensor configured for determination of a shear force in at least one direction,wherein the secondary magnetic field sensor is configured for, in the case of one or more external magnetic field sources, outputting a secondary signal containing information about the external magnetic fields from the one or more external magnetic field sources that are measured at a detecting region of the at least one direction-sensitive magnetic field sensor, andwherein the printed circuit board processor, the at least one magnetic field sensor device, and the secondary magnetic field sensor are arranged inside the member.
2. The load sensing pin according to claim 1, further comprising a storage or memory device containing software for computing the information for determining the amount and direction of force acting on the tow coupling, wherein the storage or memory device is arranged inside the hollow member or in an external module and is connected to the processor.
3. The load sensing pin according to claim 1, further comprising a shielding device positioned around all or a portion of the load sensing pin, wherein the shielding device is configured for, in the case of one or more external magnetic field sources, reducing the strength of an external magnetic field from the one or more external magnetic field sources at a detecting region of the at least one direction-sensitive magnetic field sensor.
4. A force sensing apparatus for outputting a signal containing information for determining an amount and direction of force acting on a tow coupling comprising: a first device adapted to being connected or interconnected to a towing vehicle;a second device movable relative to the first device and adapted to being connected or interconnected to a towed vehicle; andat least one load sensor pin connected or interconnected between the first and second devices thereby forming a mechanical force transmitting connection between the first and the second devices and the at least one load sensor pin,wherein the load sensor pin comprises: an elongated generally cylindrically hollow and elastically deformable shaft-like member having at least two magneto-elastically active regions directly or indirectly attached to or forming a part of the member at longitudinally spaced apart locations between respective ends of the member, wherein each of the active regions possess a remanent magnetic polarization that becomes increasingly helically shaped when a mechanical stress on the member, transmitted to the magneto-elastically active regions, increases; anda printed circuit board processor, the processor being adapted to receiving signals from at least one magnetic field sensor device arranged proximate to each of the magneto-elastically active regions, wherein the at least one magnetic field sensor device includes at least one direction-sensitive magnetic field sensor configured for determination of a shear force in at least one direction, and wherein the printed circuit board processor and the at least magnetic field sensor device are arranged inside the hollow member,wherein the first device includes first and second axially-aligned and spaced apart through-holes for rigidly fixing opposite ends of the at least one load sensor pin in the through-holes,wherein the second device includes at least one through-hole surrounding a portion of the load sensor pin between the end portions of the at least one load sensor pin, andwherein, in the absence of the shear force acting on the at least one load sensor pin, the third through-hole is axially-aligned with the axially-aligned first and second through-holes.
5. The force sensing apparatus according to claim 4, further comprising a storage or memory device containing software for computing the information for determining the amount and direction of force acting on the tow coupling, wherein the storage or memory device is arranged inside the hollow member or in an external module and is connected to the processor.
6. The force sensing apparatus according to claim 4, wherein the force sensing apparatus is part of a tow coupling device.
7. The force sensing apparatus according to claim 4, wherein the tow coupling device is one of a ball hitch, a fifth wheel hitch, or a gooseneck hitch.
8. The force sensing apparatus according to claim 4, wherein the first device is connected to a member attached to the towing vehicle.
9. The force sensing apparatus according to claim 4, wherein the second device is connected to a receiver member adapted to receiving a removable drawbar having a ball hitch.
10. A tow coupling assembly for attaching to a towing vehicle comprising: a first device adapted to being connected or interconnected to a hitch tube of the towing vehicle;a second device movable relative to the first device and adapted to being connected or interconnected to a hitch device; andat least one load sensor pin interconnecting the first and second devices thereby forming a mechanical force transmitting connection between the first device, the second devices, and the at least one load sensor pin,wherein the load sensor pin comprises: an elongated generally cylindrically hollow and elastically deformable shaft-like member having at least two magneto-elastically active regions directly or indirectly attached to or forming a part of the member at longitudinally spaced apart locations between respective ends of the member, wherein each of the active regions possess a remanent magnetic polarization that becomes increasingly helically shaped when a mechanical stress on the member, transmitted to the magneto-elastically active regions, increases; anda printed circuit board processor, the processor being adapted to receiving signals from at least one magnetic field sensor device arranged proximate to each of the magneto-elastically active regions, wherein the at least one magnetic field sensor device includes at least one direction-sensitive magnetic field sensor configured for determination of a shear force in at least one direction, and wherein the printed circuit board processor and the at least magnetic field sensor device are arranged inside the hollow member,wherein the first device includes first and second axially-aligned and spaced apart through-holes for rigidly fixing opposite ends of the at least one load sensor pin in the through-holes,wherein the second device includes at least one through-hole surrounding a portion of the at least one load sensor pin between the end portions of the at least one load sensor pin, andwherein, in the absence of the shear force acting on the at least one load sensor pin, the third through-hole is axially-aligned with the axially-aligned first and second through-holes.
11. The tow coupling assembly according to claim 10, further comprising a storage or memory device containing software for computing an information useful for determining the amount and direction of force acting on the tow coupling, wherein the storage or memory device is arranged inside the hollow member or in an external module and is connected to the processor.
12. The tow coupling assembly according to claim 10, wherein the hitch device comprises a receiver for receiving a removable drawbar having a ball hitch.
13. A computer-implemented tow load measuring method comprising: providing a tow coupling assembly for attaching to a towing vehicle, the tow coupling assembly comprising a load sensor pin and an electrical connector for wired or wirelessly connecting the load sensor pin to an electronic connection of the towing vehicle, wherein the load sensor pin comprises, an elongated generally cylindrically hollow and elastically deformable shaft-like member having at least two magneto-elastically active regions directly or indirectly attached to or forming a part of the member located between respective ends of the member, wherein each of the at least two active regions possesses a remanent magnetic polarization that becomes increasingly helically shaped when a mechanical stress on the member, transmitted to the at least one magneto-elastically active regions, increases; andat least one magnetic field sensor device arranged proximate to each of the magneto-elastically active regions, wherein the at least one magnetic field sensor device includes at least one direction-sensitive magnetic field sensor configured for determination of a shear force in at least one direction, and wherein the at least one magnetic field sensor device is arranged inside the hollow member; andproviding a software adapted to being stored in a storage device and further adapted to, receiving one or more signals from the at least one magnetic field sensor device having information about a magnetic field when the magnetic field is generated by either of the at least two magneto-elastically active regions, computing a total tongue weight value using the information, and outputting the computed value as a signal to the towing vehicle via the electrical connector.
14. The method according to claim 13, wherein the software is further adapted to computing a longitudinal load, a vertical load, and a transverse load.
15. The method according to claim 13, further comprising providing a maximum payload rating of the towing vehicle and a total weight-carrying rating of the tow coupling assembly for use in computing the total tongue weight value.
16. The method according to claim 13, wherein the step of computing the total tongue weight value comprises receiving information from one or more towing vehicle sensors.
17. The method according to claim 13, further comprising outputting an alert.
18. A sensor system for a vehicle tow coupling comprising: at least one load sensor pin for use in interconnecting a first and a second device thereby forming a mechanical force transmitting connection between the first device, the second device, and the at least one load sensor pin, wherein the load sensor pin comprises an elongated generally cylindrically hollow and elastically deformable shaft-like member having at least two magneto-elastically active regions directly or indirectly attached to or forming a part of the member at longitudinally spaced apart locations between respective ends of the member, and at least one magnetic field sensor device arranged proximate to each of the magneto-elastically active regions, wherein the at least one magnetic field sensor device includes at least one direction-sensitive magnetic field sensor configured to output a signal representing a shear force in at least one direction, and wherein the at least one magnetic field sensor device is arranged inside the hollow member;a module external to the at least one load sensor pin comprising software and a processor adapted for determining, using at least the signal, an amount and a direction of a mechanical force when the mechanical force is acting on the at least one load sensor pin; anda harness comprising one or more cables for transmitting the signal from the at least one magnetic field sensor device to the external module.
19. The sensor system according to claim 18, wherein the first device includes first and second axially-aligned and spaced apart through-holes for rigidly fixing opposite ends of the at least one load sensor pin in the through-holes, wherein the second device includes at least one through-hole surrounding a portion of the at least one load sensor pin between the end portions of the at least one load sensor pin, and wherein, in the absence of the mechanical force acting on the at least one load sensor pin, the third through-hole is axially-aligned with the axially-aligned first and second through-holes.
20. The sensor system according to claim 19, wherein the first device is adapted to being connected or interconnected to a towing vehicle, and wherein the second device is movable relative to the first device and is adapted to being connected or interconnected to a hitch device.
21. The sensor system according to claim 18, wherein the software and the processor are further adapted for determining the amount and the direction of the mechanical force using one or more values selected from the group consisting of an outer diameter of the at least one load sensor pin, an inner diameter of the at least one load sensor pin, a width of the at least one load sensor pin, a height of the at least one load sensor pin, a drop distance of a drawbar relative to a receiver for the drawbar, and a distance between a first one of the at least one load sensor pin and a second one of the at least one load sensor pin.
22. The sensor system according to claim 18, wherein the mechanical force is one of or a sum of more than one of a tongue force in a vertical direction, a tow force in a longitudinal direction, and a sway force in a transverse direction.
23. The sensor system according to claim 19, further comprising: a magnetic field sensor device separate from the at least one magnetic field sensor device, arranged inside the hollow member of the at least one load sensor pin and adapted for detecting the presence of an external magnetic field and for outputting a second signal containing information representative of the external magnetic field,wherein the software and the processor are further adapted for using the second signal to compensate for the effects of the external magnetic field on the signal from the at least one magnetic field sensor device.

CROSS-REFERENCE TO RELATED APPLICATIONS

This nonprovisional patent application is based on and claims the benefit of the respective filing dates and disclosures of U.S. Provisional Application No. 62/635,848, filed on Feb. 27, 2018, entitled “Magneto-elastic Based Sensor Assembly and Method”; U.S. Provisional Application No. 62/635,869, filed on Feb. 27, 2018, entitled “Tow Hitches With Magneto-elastic Sensing Devices and Methods”; U.S. Provisional Application No. 62/635,890, filed on Feb. 27, 2018, entitled “Towing System With Hitch Forces Sensing Method”; and U.S. Provisional Application No. 62/677,378, filed on May 29, 2018, entitled “Towing System Using Magnetic Field Sensing Method,” the contents of each of which are incorporated herein.

US Referenced Citations (1226)

Number	Name	Date	Kind
2317718	Barnes et al.	Apr 1943	A
3514997	Gwathmey et al.	Jun 1970	A
3520184	Tanner et al.	Jul 1970	A
3593263	Olsen	Jul 1971	A
3737233	Blau et al.	Jun 1973	A
3972231	Richardson	Aug 1976	A
4105972	Smith	Aug 1978	A
4384270	Morita et al.	May 1983	A
4814743	Hanaki	Mar 1989	A
4836019	Hagen et al.	Jun 1989	A
5052232	Garshelis	Oct 1991	A
5205169	Hagen	Apr 1993	A
5223072	Brockman	Jun 1993	A
5351564	Watson et al.	Oct 1994	A
5616861	Hagen	Apr 1997	A
5617025	Taylor et al.	Apr 1997	A
5618999	Schweitzer et al.	Apr 1997	A
5684254	Nakazaki et al.	Nov 1997	A
5716071	Stanley et al.	Feb 1998	A
5716302	Andersson	Feb 1998	A
5727637	Kono et al.	Mar 1998	A
5729194	Spears et al.	Mar 1998	A
5731525	Boe	Mar 1998	A
5738176	Gingerich	Apr 1998	A
5739442	Schweitzer et al.	Apr 1998	A
5741048	Eccleston	Apr 1998	A
5741981	Ling et al.	Apr 1998	A
5747683	Gerum et al.	May 1998	A
5773722	Helderman	Jun 1998	A
5777240	Lefebvre et al.	Jul 1998	A
5780782	O'Dea	Jul 1998	A
5780783	Heider et al.	Jul 1998	A
5782542	McGrath et al.	Jul 1998	A
5783751	Maw et al.	Jul 1998	A
5785393	McGrath et al.	Jul 1998	A
5791676	Jones	Aug 1998	A
5800025	McGrath et al.	Sep 1998	A
5806937	Brunson	Sep 1998	A
5811738	Boyovich et al.	Sep 1998	A
5821852	Fairchild	Oct 1998	A
5822876	Haas et al.	Oct 1998	A
5823637	Blue	Oct 1998	A
5824771	Rivier	Oct 1998	A
5831173	Hanano	Nov 1998	A
5844146	Murray et al.	Dec 1998	A
5848826	Muller	Dec 1998	A
5851021	Van Kley	Dec 1998	A
5853186	Gentner et al.	Dec 1998	A
5861802	Hungerink et al.	Jan 1999	A
5861814	Clayton	Jan 1999	A
5863057	Wessels	Jan 1999	A
5865593	Cohn	Feb 1999	A
5876055	Fontaine	Mar 1999	A
5876100	Breckner et al.	Mar 1999	A
5877455	Kyrtsos	Mar 1999	A
5880409	Hartman	Mar 1999	A
5883312	Hayashida	Mar 1999	A
5884238	Noll et al.	Mar 1999	A
5910217	Sargent	Jun 1999	A
5912616	Valentino	Jun 1999	A
5915281	Sparks	Jun 1999	A
5921641	Lupges et al.	Jul 1999	A
5941560	Wolfram	Aug 1999	A
5947225	Kawakami et al.	Sep 1999	A
5947637	Neuling	Sep 1999	A
5951035	Phillips, Jr. et al.	Sep 1999	A
5957476	Simpson	Sep 1999	A
5964476	Maines	Oct 1999	A
5969270	Doemes et al.	Oct 1999	A
5971432	Gagnon et al.	Oct 1999	A
5980048	Rannells, Jr. et al.	Nov 1999	A
5983729	Taylor	Nov 1999	A
5985666	Loiselle et al.	Nov 1999	A
5988000	Adams	Nov 1999	A
5988666	Flater	Nov 1999	A
6000709	Gentner et al.	Dec 1999	A
6003614	Crabb	Dec 1999	A
6012780	Duvernay	Jan 2000	A
6012781	Gerum	Jan 2000	A
6013880	McFarlane et al.	Jan 2000	A
6014901	Boe	Jan 2000	A
6025563	Lesesky et al.	Feb 2000	A
6035943	Gerein et al.	Mar 2000	A
6037550	Bradley	Mar 2000	A
6039139	Breed et al.	Mar 2000	A
6039410	Robertson et al.	Mar 2000	A
6042196	Nakamura et al.	Mar 2000	A
6044915	Schlegel et al.	Apr 2000	A
6044916	Hundeby	Apr 2000	A
6050649	Hensley	Apr 2000	A
6053521	Schertler	Apr 2000	A
6065353	Hirabayashi et al.	May 2000	A
6068352	Kulkarni et al.	May 2000	A
6079791	Stumpe et al.	Jun 2000	A
6082203	Koivisto et al.	Jul 2000	A
6082467	Friesen	Jul 2000	A
6084183	Nakazaki	Jul 2000	A
6095348	Karashima	Aug 2000	A
6100794	Hillier	Aug 2000	A
6100795	Otterbacher et al.	Aug 2000	A
6105230	Balestracci	Aug 2000	A
6112589	Tressler et al.	Sep 2000	A
6116638	Hosoda	Sep 2000	A
6118083	Boyovich et al.	Sep 2000	A
6120052	Capik et al.	Sep 2000	A
6126246	Decker, Sr. et al.	Oct 2000	A
6127939	Lesesky et al.	Oct 2000	A
6139118	Hurst et al.	Oct 2000	A
6142959	Sarvazyan et al.	Nov 2000	A
6144928	Leimbach et al.	Nov 2000	A
6150617	Hart et al.	Nov 2000	A
6152252	Pettersson	Nov 2000	A
6152475	Poole	Nov 2000	A
6157889	Baker	Dec 2000	A
6161962	French et al.	Dec 2000	A
6168181	Gadd	Jan 2001	B1
6176505	Capik et al.	Jan 2001	B1
6178650	Thibodeaux	Jan 2001	B1
6179319	Malisch et al.	Jan 2001	B1
6189644	Taylor	Feb 2001	B1
6196328	McDaniel et al.	Mar 2001	B1
6203045	Kyrtsos et al.	Mar 2001	B1
6203049	Gibson	Mar 2001	B1
6216072	Boe et al.	Apr 2001	B1
6218737	Adamek et al.	Apr 2001	B1
6222443	Beeson et al.	Apr 2001	B1
6222457	Mills et al.	Apr 2001	B1
6230817	Haugen	May 2001	B1
6234508	Tuttle et al.	May 2001	B1
6234511	Gentner et al.	May 2001	B1
6240339	von Mayenburg et al.	May 2001	B1
6240788	Balestracci	Jun 2001	B1
6242701	Breed et al.	Jun 2001	B1
6246316	Andsager	Jun 2001	B1
6250650	Douglas	Jun 2001	B1
6250863	Kamentser et al.	Jun 2001	B1
6252497	Dupay et al.	Jun 2001	B1
6259357	Heider	Jul 2001	B1
6262573	Wojnarowski et al.	Jul 2001	B1
6264337	Rannells, Jr. et al.	Jul 2001	B1
6268800	Howard	Jul 2001	B1
6273522	Feetenby et al.	Aug 2001	B1
6285278	Schutt et al.	Sep 2001	B1
6289749	Sanders	Sep 2001	B1
6299191	Sargent	Oct 2001	B1
6302424	Gisinger et al.	Oct 2001	B1
6308578	DeRose	Oct 2001	B1
6327903	Hecker et al.	Dec 2001	B1
6334746	Nguyen et al.	Jan 2002	B1
6349959	Schlegel et al.	Feb 2002	B2
6351697	Baker	Feb 2002	B1
6352277	Timmings	Mar 2002	B1
6354448	Ramne	Mar 2002	B1
6364432	Mixon	Apr 2002	B1
6371217	Boden	Apr 2002	B1
6375211	MacKarvich	Apr 2002	B1
6378620	Luca et al.	Apr 2002	B1
6378957	Vågstedt	Apr 2002	B1
6384716	Eckelberry	May 2002	B1
6394490	Osmer et al.	May 2002	B2
6401855	Wolfe	Jun 2002	B1
6407353	Fritzinger et al.	Jun 2002	B1
6408685	Shin	Jun 2002	B2
6416138	Barnett	Jul 2002	B1
6419037	Kramer et al.	Jul 2002	B1
6420798	Adamek et al.	Jul 2002	B2
6439545	Hansen	Aug 2002	B1
6445993	Eccleston et al.	Sep 2002	B1
6446998	Koenig et al.	Sep 2002	B1
6450523	Masters et al.	Sep 2002	B1
6452485	Schutt et al.	Sep 2002	B1
6456066	Burd et al.	Sep 2002	B1
6480104	Wall et al.	Nov 2002	B1
6490935	Joki et al.	Dec 2002	B1
6494476	Masters et al.	Dec 2002	B2
6494478	MacKarvich	Dec 2002	B1
6499814	Mixon	Dec 2002	B1
6516925	Napier et al.	Feb 2003	B1
6523911	Rupp et al.	Feb 2003	B1
6524221	Nishimura	Feb 2003	B2
6525276	Vellidus et al.	Feb 2003	B1
6531951	Serban et al.	Mar 2003	B2
6534728	Spikings	Mar 2003	B1
6547271	Kleb et al.	Apr 2003	B2
6581695	Bernhardt et al.	Jun 2003	B2
6587041	Brown, Jr.	Jul 2003	B1
6592230	Dupay	Jul 2003	B2
6595062	Luke et al.	Jul 2003	B1
6598895	Hult et al.	Jul 2003	B1
6606913	Gianchandani	Aug 2003	B1
6609055	Stanley	Aug 2003	B2
6615125	Eccleston et al.	Sep 2003	B2
6619136	Basile et al.	Sep 2003	B2
6619759	Bradsen et al.	Sep 2003	B2
6624363	Orlando et al.	Sep 2003	B2
6626504	Harner et al.	Sep 2003	B2
6629701	Colibert	Oct 2003	B1
6631916	Miller	Oct 2003	B1
6636047	Arlt et al.	Oct 2003	B2
6640646	Davis et al.	Nov 2003	B2
6644761	Schuck	Nov 2003	B2
6647162	Kim et al.	Nov 2003	B2
6652038	Frye	Nov 2003	B1
6652544	Houser et al.	Nov 2003	B2
6655710	Lindell et al.	Dec 2003	B2
6662138	Takafuji et al.	Dec 2003	B1
6663132	Kizy	Dec 2003	B1
6666097	Smith	Dec 2003	B2
6666527	Gill et al.	Dec 2003	B2
6668225	Oh et al.	Dec 2003	B2
6685281	MacGregor et al.	Feb 2004	B2
6688631	Andre	Feb 2004	B1
6691635	Murakami et al.	Feb 2004	B2
6705684	Garvey	Mar 2004	B1
6722684	McAllister	Apr 2004	B1
6739611	Gisinger et al.	May 2004	B2
6753780	Li	Jun 2004	B2
6765607	Mizusawa et al.	Jul 2004	B2
6769315	Stevenson et al.	Aug 2004	B2
6769709	Piper et al.	Aug 2004	B1
6777968	Kobayashi et al.	Aug 2004	B1
6779616	Brown	Aug 2004	B1
6793233	Eckelberry et al.	Sep 2004	B2
6799653	Recknagel	Oct 2004	B2
6799814	Lesesky et al.	Oct 2004	B2
6803530	Carlstrom et al.	Oct 2004	B2
6807869	Farringdon et al.	Oct 2004	B2
6808098	Bickett, III et al.	Oct 2004	B1
6813959	Kim et al.	Nov 2004	B2
6829943	Weyand et al.	Dec 2004	B2
6845851	Donaldson et al.	Jan 2005	B1
6851504	Campbell et al.	Feb 2005	B2
6851697	Kinnard	Feb 2005	B2
6854557	Deng et al.	Feb 2005	B1
6859753	Thakur et al.	Feb 2005	B1
6860030	Graf et al.	Mar 2005	B1
6860161	Yamakawa et al.	Mar 2005	B2
6863286	Eros et al.	Mar 2005	B2
6863295	Reutlinger et al.	Mar 2005	B2
6866283	Alguera et al.	Mar 2005	B2
6871547	Davis et al.	Mar 2005	B2
6873909	Borugian	Mar 2005	B2
6886847	Piper et al.	May 2005	B2
6920940	Casali et al.	Jul 2005	B2
6921100	Mantini et al.	Jul 2005	B2
6921139	Tobler	Jul 2005	B2
6931947	Schulze et al.	Aug 2005	B2
6932374	Timms et al.	Aug 2005	B1
6938910	Liljeberg et al.	Sep 2005	B2
6940186	Weitkamp	Sep 2005	B2
6945348	Henderson et al.	Sep 2005	B2
6948387	Chen et al.	Sep 2005	B2
6966613	Davis	Nov 2005	B2
6969809	Rainey	Nov 2005	B2
6971452	Ocsenknecht et al.	Dec 2005	B2
6983883	Ridling	Jan 2006	B2
6990745	Schoenenberger	Jan 2006	B1
6997060	Morikawa	Feb 2006	B2
6997279	Kolpasky et al.	Feb 2006	B2
7000352	Ishihara et al.	Feb 2006	B2
7005587	Axakov et al.	Feb 2006	B2
7006127	Mizusawa et al.	Feb 2006	B2
7009118	Pottebaum et al.	Mar 2006	B2
7021157	Nastasi, Jr.	Apr 2006	B2
7024940	Davis et al.	Apr 2006	B2
7032918	Saarinen et al.	Apr 2006	B2
7055639	Kiribayashi	Jun 2006	B2
7057498	Cook et al.	Jun 2006	B1
7072763	Saxon et al.	Jul 2006	B2
7073603	Nordhoff	Jul 2006	B2
7077015	Hayward et al.	Jul 2006	B2
7096991	Keutz	Aug 2006	B2
7117755	Yang	Oct 2006	B2
7125033	Forrister	Oct 2006	B2
7131512	Aoki	Nov 2006	B2
7135645	Hiraki et al.	Nov 2006	B2
7137302	Silverbrook et al.	Nov 2006	B2
7137472	Aoki	Nov 2006	B2
7140632	Alguera et al.	Nov 2006	B2
7141746	Scott	Nov 2006	B1
7142968	Alexander et al.	Nov 2006	B2
7151443	Dialinakis	Dec 2006	B2
7156410	Maskaleris	Jan 2007	B1
7158017	Baur et al.	Jan 2007	B2
7159890	Craig et al.	Jan 2007	B2
7168661	Fox	Jan 2007	B1
7171289	Tamez et al.	Jan 2007	B1
7171330	Kruse et al.	Jan 2007	B2
7171769	Schultz et al.	Feb 2007	B2
7178818	Katagiri et al.	Feb 2007	B2
7182362	Yeakel	Feb 2007	B2
7188549	Ohtake et al.	Mar 2007	B2
7190258	Lee	Mar 2007	B2
7195267	Thompson	Mar 2007	B1
7204504	Gehring et al.	Apr 2007	B2
7207588	Bergum et al.	Apr 2007	B2
7210209	Dvoskin et al.	May 2007	B2
7221265	Bjorkgard	May 2007	B2
7224264	Honan, III	May 2007	B2
7225068	Schick et al.	May 2007	B2
7225891	Gehring et al.	Jun 2007	B2
7226068	Ahner et al.	Jun 2007	B2
7226134	Horn et al.	Jun 2007	B2
7236866	Takafuji et al.	Jun 2007	B2
7237790	Gehring et al.	Jul 2007	B2
7261487	Urbach	Aug 2007	B2
7267020	Wilcox et al.	Sep 2007	B2
7270486	Meyer	Sep 2007	B2
7273260	Gray	Sep 2007	B2
7275619	Tokumoto	Oct 2007	B2
7285735	Elliott et al.	Oct 2007	B1
7287947	Smith	Oct 2007	B2
7290783	Dornbos	Nov 2007	B2
7293809	Suzuki et al.	Nov 2007	B2
7294793	Axakov et al.	Nov 2007	B2
7302332	Nenninger	Nov 2007	B2
7305864	Graber et al.	Dec 2007	B2
7309075	Ramsey et al.	Dec 2007	B2
7311364	Robertson	Dec 2007	B2
7331238	Wanami et al.	Feb 2008	B2
7336159	Fackrell et al.	Feb 2008	B2
7338062	Violette et al.	Mar 2008	B1
7341264	Swannie	Mar 2008	B2
7344204	Cayer	Mar 2008	B2
7344311	Lu et al.	Mar 2008	B2
7347464	Tanabe	Mar 2008	B2
7357036	Steprath	Apr 2008	B2
7361303	Kantor et al.	Apr 2008	B2
7380810	Wilkens et al.	Jun 2008	B1
7387183	Breed et al.	Jun 2008	B2
7388370	Cech et al.	Jun 2008	B2
7390008	Hall	Jun 2008	B1
7401527	Flaharty et al.	Jul 2008	B2
7401871	Lu et al.	Jul 2008	B2
7404448	Tuttle et al.	Jul 2008	B2
7404466	Diehl	Jul 2008	B2
7408123	Hawes et al.	Aug 2008	B2
7410183	Stowell et al.	Aug 2008	B2
7415869	Beverly et al.	Aug 2008	B2
7419027	Bihya	Sep 2008	B2
7429051	Bauer et al.	Sep 2008	B2
7429073	Watanabe et al.	Sep 2008	B2
7430491	Gutierrez et al.	Sep 2008	B2
7431319	Staggs	Oct 2008	B2
7438368	Kohler et al.	Oct 2008	B2
7452038	Crawford	Nov 2008	B2
7454304	Johansen et al.	Nov 2008	B2
7455139	Lee	Nov 2008	B2
7458597	MacDougall	Dec 2008	B2
7463137	Wishart et al.	Dec 2008	B2
7463139	Burlak et al.	Dec 2008	B2
7472599	Vik et al.	Jan 2009	B2
7484750	Van Vooren et al.	Feb 2009	B2
7497458	Daniel	Mar 2009	B2
7506885	Colibert et al.	Mar 2009	B2
7507917	Kaltenheuser	Mar 2009	B2
7520183	Kouduki et al.	Apr 2009	B2
7522986	Kitapini et al.	Apr 2009	B2
7530590	Staggs	May 2009	B2
7540524	Viaud	Jun 2009	B2
7546764	Morinaga et al.	Jun 2009	B2
7548155	Schutt et al.	Jun 2009	B2
7549667	Busuttil et al.	Jun 2009	B2
7556278	Roberts et al.	Jul 2009	B2
7559270	Langenfeld et al.	Jul 2009	B2
7559569	Nejsum	Jul 2009	B2
7562893	Donnard	Jul 2009	B2
7568716	Dietz	Aug 2009	B2
7572988	Morton et al.	Aug 2009	B1
7575286	Robertson	Aug 2009	B2
7581503	Martin et al.	Sep 2009	B2
7584982	Fisher	Sep 2009	B2
7588089	Guo et al.	Sep 2009	B2
7598845	Kanafani	Oct 2009	B2
7600574	Chauvel	Oct 2009	B2
7603918	Blackwood et al.	Oct 2009	B2
7607677	Bosak	Oct 2009	B1
7619506	Knoll et al.	Nov 2009	B2
7619508	Lynam et al.	Nov 2009	B2
7621552	Bergum et al.	Nov 2009	B2
7631886	Kapfer et al.	Dec 2009	B2
7633020	Santi et al.	Dec 2009	B2
7648153	Metternich et al.	Jan 2010	B2
7651114	Weber et al.	Jan 2010	B2
7686516	Shibasaki et al.	Mar 2010	B2
7690664	Saieg et al.	Apr 2010	B2
7690670	Lincul	Apr 2010	B1
7693661	Iwasaka	Apr 2010	B2
7703790	Cunefare et al.	Apr 2010	B2
7712760	Ohtomo	May 2010	B2
7715970	Snyder	May 2010	B2
7717451	Alguera	May 2010	B2
7719409	Jones	May 2010	B1
7731215	Alguera	Jun 2010	B2
7731216	Cornish	Jun 2010	B2
7731302	Tandy, Jr. et al.	Jun 2010	B2
7757803	Fiske et al.	Jul 2010	B2
7758059	Alguera Gallego et al.	Jul 2010	B2
7762736	Ersoy et al.	Jul 2010	B2
7770909	Anderson et al.	Aug 2010	B2
7772839	Watson et al.	Aug 2010	B2
7775316	Hosokawa et al.	Aug 2010	B2
7777482	Munz et al.	Aug 2010	B2
7777615	Okuda et al.	Aug 2010	B2
7786849	Buckley	Aug 2010	B2
7789412	Alguera	Sep 2010	B2
7793965	Padula	Sep 2010	B2
7797093	Tsukasaki et al.	Sep 2010	B2
7798263	Tandy, Jr. et al.	Sep 2010	B2
7806423	Vikstrom et al.	Oct 2010	B2
7815212	Groshong et al.	Oct 2010	B2
7818140	Dreier et al.	Oct 2010	B2
7825783	Gallego et al.	Nov 2010	B2
7826953	Traechtler	Nov 2010	B2
7839142	Cech et al.	Nov 2010	B2
7839143	Cech et al.	Nov 2010	B2
7857331	Walters, Jr.	Dec 2010	B2
7862067	Alguera	Jan 2011	B2
7864033	Imura et al.	Jan 2011	B2
7864066	Kriel et al.	Jan 2011	B2
7868748	Kiribayashi	Jan 2011	B2
7891691	Bearey	Feb 2011	B2
7896383	Cockram et al.	Mar 2011	B2
7900736	Breed	Mar 2011	B2
7904222	Lee et al.	Mar 2011	B2
7930131	Ridenour et al.	Apr 2011	B2
7932816	Schmidt et al.	Apr 2011	B2
7949492	Krueger et al.	May 2011	B2
7959177	Fiske et al.	Jun 2011	B2
7960659	Cleary	Jun 2011	B2
7963547	Anderson	Jun 2011	B2
7967319	Alguera	Jun 2011	B2
7971942	Parrott et al.	Jul 2011	B2
7984920	Alguera	Jul 2011	B2
8002065	Glavinic et al.	Aug 2011	B2
8013759	Aid et al.	Sep 2011	B1
8038166	Piesinger	Oct 2011	B1
8039769	Asp et al.	Oct 2011	B2
8051941	Takayasu et al.	Nov 2011	B2
8060288	Choby	Nov 2011	B2
8072318	Lynam et al.	Dec 2011	B2
8073594	Lee et al.	Dec 2011	B2
8087304	Lee	Jan 2012	B2
8098145	Ancuta et al.	Jan 2012	B2
8100426	Kronenberg	Jan 2012	B2
8120475	Iwamoto et al.	Feb 2012	B2
8138899	Ghneim	Mar 2012	B2
8152243	Bensch et al.	Apr 2012	B2
8155879	Takagi et al.	Apr 2012	B2
8160806	Salaka	Apr 2012	B2
8165768	Leschuk et al.	Apr 2012	B2
8167329	Lee	May 2012	B2
8170825	Beaujot et al.	May 2012	B2
8180543	Futamura et al.	May 2012	B2
8180546	Culbert et al.	May 2012	B2
8188385	Wolfgang et al.	May 2012	B2
8191915	Freese, V et al.	Jun 2012	B2
RE43537	Davis	Jul 2012	E
8234993	Naruishi et al.	Aug 2012	B2
8239145	Suzuki et al.	Aug 2012	B2
8240270	Naruishi	Aug 2012	B2
8256526	Schmidt et al.	Sep 2012	B2
8256560	Fiske et al.	Sep 2012	B2
8256851	Pelosse	Sep 2012	B2
8258413	Ito et al.	Sep 2012	B2
8258981	Turnbull	Sep 2012	B2
8260518	Englert	Sep 2012	B2
8262120	Pitts et al.	Sep 2012	B1
8262173	Crawford	Sep 2012	B2
8267485	Barlsen et al.	Sep 2012	B2
8276461	Zwygart	Oct 2012	B2
8282173	Forster et al.	Oct 2012	B2
8286997	Kimener et al.	Oct 2012	B2
8290679	Bensch et al.	Oct 2012	B2
8297384	Wanger et al.	Oct 2012	B2
8297639	Alguera Gallego	Oct 2012	B2
8297713	Soupal	Oct 2012	B2
8308182	Ortmann et al.	Nov 2012	B2
8317216	Treude et al.	Nov 2012	B2
8322482	Sprinkle et al.	Dec 2012	B2
8322743	Klein	Dec 2012	B1
8333116	Boone et al.	Dec 2012	B2
8335607	Gatten et al.	Dec 2012	B2
8342560	Albers et al.	Jan 2013	B2
8348298	Alguera et al.	Jan 2013	B2
8364435	Battenberg	Jan 2013	B2
8365422	Ott	Feb 2013	B1
8365849	Bartel	Feb 2013	B2
8366135	Asbach et al.	Feb 2013	B2
8368523	Takahashi et al.	Feb 2013	B2
8370026	Kondoh et al.	Feb 2013	B2
8374757	Choby	Feb 2013	B2
8380390	Sy et al.	Feb 2013	B2
8389879	Kolb et al.	Mar 2013	B2
8393632	Vortmeyer et al.	Mar 2013	B2
8414010	Smith	Apr 2013	B2
8421611	Coshow et al.	Apr 2013	B1
8424393	Lee	Apr 2013	B1
8424892	Hapyuk et al.	Apr 2013	B2
8430458	Kaminski et al.	Apr 2013	B2
8463486	Park	Jun 2013	B2
8463519	McCann	Jun 2013	B2
8469125	Yu et al.	Jun 2013	B2
8483942	Watanabe	Jul 2013	B2
8485545	Szczepanek	Jul 2013	B2
8505954	Haley	Aug 2013	B1
8509997	Sorimachi	Aug 2013	B2
8511150	Lucas et al.	Aug 2013	B2
8512208	Hilberer	Aug 2013	B2
8515627	Marathe et al.	Aug 2013	B2
8527151	Le et al.	Sep 2013	B2
8528929	Kimener	Sep 2013	B2
8532870	Hoetzer et al.	Sep 2013	B2
8539843	Inns et al.	Sep 2013	B2
8540047	Takayasu et al.	Sep 2013	B2
8548683	Cebon et al.	Oct 2013	B2
8561472	Sauder et al.	Oct 2013	B2
8565983	Alberius et al.	Oct 2013	B2
8567820	Kimener et al.	Oct 2013	B2
8571777	Greene	Oct 2013	B2
8573627	Appel	Nov 2013	B2
8578794	Lee	Nov 2013	B2
8579067	Kaiser et al.	Nov 2013	B2
8587421	Koie	Nov 2013	B2
8590917	Lee	Nov 2013	B2
8615347	Alguera Gallego et al.	Dec 2013	B2
8622158	Leonard	Jan 2014	B2
8630753	Cahill	Jan 2014	B2
8635917	Lee	Jan 2014	B2
8638203	Raines	Jan 2014	B2
8646401	Branch	Feb 2014	B2
8646852	Bitter et al.	Feb 2014	B2
8651510	Fankhauser et al.	Feb 2014	B2
8651585	Kaminski et al.	Feb 2014	B2
8653959	Lynam et al.	Feb 2014	B2
8665080	Nagamine et al.	Mar 2014	B2
8678121	Troy et al.	Mar 2014	B2
8678420	Gallego et al.	Mar 2014	B2
8694211	Alg era	Apr 2014	B2
8698643	Schmitt et al.	Apr 2014	B2
8700270	Foster et al.	Apr 2014	B2
8701503	Shimizu et al.	Apr 2014	B2
8706344	Park	Apr 2014	B2
8716609	Pangrazio et al.	May 2014	B2
8717013	Rohmann	May 2014	B2
8717197	Rathmacher et al.	May 2014	B2
8733242	Viaud	May 2014	B2
8738196	Kronenberg	May 2014	B2
8739916	Furuhi et al.	Jun 2014	B2
8744694	Ystueta	Jun 2014	B2
8746084	Ghannam et al.	Jun 2014	B2
8746812	Albright et al.	Jun 2014	B2
8749628	Wuestefeld et al.	Jun 2014	B2
8753032	Yu et al.	Jun 2014	B2
8768535	Kossira et al.	Jul 2014	B2
8779305	Takayasu et al.	Jul 2014	B2
8781714	Kim et al.	Jul 2014	B2
8788151	Hwang et al.	Jul 2014	B2
8789850	Kimener et al.	Jul 2014	B2
8789896	Albright et al.	Jul 2014	B2
8794656	West	Aug 2014	B2
8798842	Woolf et al.	Aug 2014	B2
8814198	Wolfe	Aug 2014	B2
8818699	Nichols et al.	Aug 2014	B2
8822849	Takayasu et al.	Sep 2014	B2
8827297	Keatley	Sep 2014	B2
8836458	Lee	Sep 2014	B2
8838353	Wu et al.	Sep 2014	B2
8841566	Reichow et al.	Sep 2014	B2
8841994	Li et al.	Sep 2014	B2
8850900	Isono et al.	Oct 2014	B2
8855854	Schmidt et al.	Oct 2014	B2
8857825	Johnson	Oct 2014	B1
8864247	Hilberer	Oct 2014	B2
8864382	Ono et al.	Oct 2014	B2
8868356	Liu	Oct 2014	B2
8886400	Kossira et al.	Nov 2014	B2
8888120	Trevino	Nov 2014	B2
8888121	Trevino et al.	Nov 2014	B2
8890670	Brey	Nov 2014	B2
8892270	Engstrand	Nov 2014	B2
8893562	Barraco et al.	Nov 2014	B2
8905179	Endo et al.	Dec 2014	B2
8905424	Williams, Jr. et al.	Dec 2014	B2
8917170	Padula	Dec 2014	B2
8930114	Reid	Jan 2015	B1
8939462	Adamczyk et al.	Jan 2015	B2
8954240	Scully	Feb 2015	B2
8955865	Fortin et al.	Feb 2015	B2
8965635	Alberius et al.	Feb 2015	B2
8966998	Gentner et al.	Mar 2015	B2
8976246	Rappuhn	Mar 2015	B1
8987615	Khatavkar et al.	Mar 2015	B2
8988220	Markyvech et al.	Mar 2015	B2
8997587	Usowicz et al.	Apr 2015	B2
8998240	Boittin et al.	Apr 2015	B2
9004523	Scharf	Apr 2015	B2
9016142	Takahashi et al.	Apr 2015	B2
9026311	Pieronek et al.	May 2015	B1
9027949	Reimer	May 2015	B2
9031754	Matoy et al.	May 2015	B2
9037312	Rhode et al.	May 2015	B2
9037322	Fortin et al.	May 2015	B2
9037346	Keys, II et al.	May 2015	B2
9043094	Wellhoefer et al.	May 2015	B2
9056535	Materna et al.	Jun 2015	B2
9061629	Miller et al.	Jun 2015	B2
9061686	Yu et al.	Jun 2015	B2
9078391	Pichlmaier	Jul 2015	B2
9080931	Carbo, Jr. et al.	Jul 2015	B2
9085261	Lu et al.	Jul 2015	B2
9102272	Trombley et al.	Aug 2015	B2
9108598	Headley	Aug 2015	B2
9108691	Fanourakis et al.	Aug 2015	B2
9109964	Bao et al.	Aug 2015	B2
9114832	Wang et al.	Aug 2015	B2
9120358	Motts et al.	Sep 2015	B2
9120359	Chiu et al.	Sep 2015	B2
9133780	Asami et al.	Sep 2015	B2
9134149	Endo et al.	Sep 2015	B2
9140587	Endo et al.	Sep 2015	B2
9150061	Riehle et al.	Oct 2015	B2
9150062	Hao	Oct 2015	B2
9150201	Smith et al.	Oct 2015	B2
9156384	Takayasu et al.	Oct 2015	B2
9157785	Brenninger	Oct 2015	B2
9168901	Funder et al.	Oct 2015	B2
9174614	Mercure	Nov 2015	B2
9180814	Mitani et al.	Nov 2015	B2
9180846	Mercure	Nov 2015	B2
9186942	Waggoner et al.	Nov 2015	B1
9193385	Svardby et al.	Nov 2015	B2
9207135	Staufer et al.	Dec 2015	B2
9211772	Brown et al.	Dec 2015	B2
9217683	Branch	Dec 2015	B2
9227474	Liu	Jan 2016	B2
9227607	Ripley et al.	Jan 2016	B1
9228882	Ruby	Jan 2016	B2
9234815	Brathe et al.	Jan 2016	B2
9238483	Hafner et al.	Jan 2016	B2
9254828	Simpson	Feb 2016	B2
9255858	Vallon et al.	Feb 2016	B2
9255909	Kollgaard et al.	Feb 2016	B2
9258869	Tarr	Feb 2016	B2
9260078	Mederer et al.	Feb 2016	B2
9266401	Klank et al.	Feb 2016	B2
9268061	Salmi	Feb 2016	B2
9278673	Squire et al.	Mar 2016	B2
9282690	Tilkes et al.	Mar 2016	B2
9283932	Bleckmann et al.	Mar 2016	B2
9290166	Harrison et al.	Mar 2016	B2
9290203	Lavoie et al.	Mar 2016	B2
9302557	Alldredge et al.	Apr 2016	B2
9303627	Romo et al.	Apr 2016	B2
9315173	Gray et al.	Apr 2016	B1
9315179	Herges et al.	Apr 2016	B2
9321440	Perlick et al.	Apr 2016	B2
9321483	Headley	Apr 2016	B2
9327566	McAllister	May 2016	B2
9329094	Noguchi	May 2016	B2
9335163	Lavoie et al.	May 2016	B2
9338937	Sauder et al.	May 2016	B2
9340150	Kendrick et al.	May 2016	B2
9340197	Miersch-Wiemers et al.	May 2016	B1
9346439	Diehl et al.	May 2016	B2
9347844	Tilkes et al.	May 2016	B2
9347845	Gieβibl	May 2016	B2
9352623	Lynam et al.	May 2016	B2
9352629	Chabanon et al.	May 2016	B2
9366591	Bodenweber et al.	Jun 2016	B2
9370977	Sallis, Sr.	Jun 2016	B2
9372125	Geldman	Jun 2016	B2
9374562	Trombley et al.	Jun 2016	B2
9383270	Galambos et al.	Jul 2016	B1
9389328	Schneider et al.	Jul 2016	B2
9393593	Niemi et al.	Jul 2016	B2
9393846	Kadnikov et al.	Jul 2016	B2
9395233	Dourra et al.	Jul 2016	B2
9400238	Bin	Jul 2016	B2
9403412	Kim et al.	Aug 2016	B2
9403413	Talty et al.	Aug 2016	B2
9415753	Pieronek et al.	Aug 2016	B2
9421884	Boyer et al.	Aug 2016	B2
9432492	Peterson et al.	Aug 2016	B2
9434224	Schulte	Sep 2016	B2
9434414	Lavoie	Sep 2016	B2
9442030	Fujiwara et al.	Sep 2016	B2
9446747	Fosdike	Sep 2016	B2
9456468	Fry	Sep 2016	B2
9457632	Windeler et al.	Oct 2016	B1
9459135	Kirita et al.	Oct 2016	B2
9459161	Galambos et al.	Oct 2016	B1
9464886	Salter et al.	Oct 2016	B2
9464887	Salter et al.	Oct 2016	B2
9464930	Santi	Oct 2016	B2
9464953	Wirthlin	Oct 2016	B2
9481346	Morselli et al.	Nov 2016	B2
9493156	Haeussler et al.	Nov 2016	B2
9499018	Gehrke et al.	Nov 2016	B2
9499109	Armacost et al.	Nov 2016	B2
9499200	Hochrein et al.	Nov 2016	B2
9505281	Borkholder	Nov 2016	B1
9506786	Strnad et al.	Nov 2016	B2
9510498	Tuttle et al.	Dec 2016	B2
9513103	Crossman	Dec 2016	B2
9516275	Okano et al.	Dec 2016	B2
9517668	Lavoie	Dec 2016	B2
9517739	Kollmer et al.	Dec 2016	B2
9518881	Hammerschmidt	Dec 2016	B2
9522582	Cullen et al.	Dec 2016	B2
9533721	Booher et al.	Jan 2017	B2
9545828	Grannemann et al.	Jan 2017	B2
9550399	Jones et al.	Jan 2017	B2
9550479	Kim	Jan 2017	B2
9550481	Tu et al.	Jan 2017	B2
9551788	Epler	Jan 2017	B2
9554499	Muller et al.	Jan 2017	B2
9555813	Strano	Jan 2017	B2
9561784	Casali et al.	Feb 2017	B2
9562801	Santi	Feb 2017	B2
9574955	Iwase et al.	Feb 2017	B2
9581487	Warzecha et al.	Feb 2017	B2
9593992	Wu	Mar 2017	B2
9604613	Cooper et al.	Mar 2017	B2
9610975	Hu et al.	Apr 2017	B1
9616753	Oi et al.	Apr 2017	B2
9616943	Burchett et al.	Apr 2017	B2
9623849	Spath et al.	Apr 2017	B2
9623904	Lavoie et al.	Apr 2017	B2
9630459	Choi	Apr 2017	B2
9631969	Whalen	Apr 2017	B1
9638595	Shigeta	May 2017	B2
9643462	McAllister	May 2017	B2
9645023	Li	May 2017	B2
9649879	Randall et al.	May 2017	B2
9649899	Berry et al.	May 2017	B1
9650030	Nagura	May 2017	B2
9651433	Matsuzawa et al.	May 2017	B2
9651438	Tokito	May 2017	B2
9653865	Ayabakan et al.	May 2017	B2
9656637	Kimener	May 2017	B2
9656699	Polgrean	May 2017	B1
9663079	Yamamoto	May 2017	B2
9671298	Sawada et al.	Jun 2017	B2
9676377	Hafner et al.	Jun 2017	B2
9677592	Bernhardt	Jun 2017	B2
9688111	Ghannam et al.	Jun 2017	B1
9694749	Lynam et al.	Jul 2017	B2
9694790	Kimener	Jul 2017	B2
9694816	Morissette	Jul 2017	B2
9696227	Lavergne	Jul 2017	B2
9696229	Schulz et al.	Jul 2017	B2
9696723	Zeng et al.	Jul 2017	B2
9702797	Yang	Jul 2017	B2
9708165	Oberg	Jul 2017	B2
9718503	Ursich et al.	Aug 2017	B2
9723692	Sibley, Jr. et al.	Aug 2017	B2
9723815	Epema	Aug 2017	B2
9726535	Reichow et al.	Aug 2017	B2
9731568	Wuergler et al.	Aug 2017	B2
9738125	Brickley et al.	Aug 2017	B1
9738216	Kendrick et al.	Aug 2017	B2
9738333	Alldredge et al.	Aug 2017	B2
9744972	Trombley et al.	Aug 2017	B2
9745013	Wood	Aug 2017	B2
9758138	Albright et al.	Sep 2017	B2
9758140	Eberling et al.	Sep 2017	B2
9760748	Iannotti et al.	Sep 2017	B2
9796226	Turner et al.	Oct 2017	B2
9796227	McAllister	Oct 2017	B2
9799132	Okano et al.	Oct 2017	B2
9802587	Morselli	Oct 2017	B2
9802771	Kimener et al.	Oct 2017	B2
9804022	Kyrtsos et al.	Oct 2017	B2
9805459	Nakamura et al.	Oct 2017	B2
9805623	Kwon et al.	Oct 2017	B1
9809206	Hummel et al.	Nov 2017	B2
9809249	Boehm et al.	Nov 2017	B2
9812037	Kwon et al.	Nov 2017	B2
9821779	Grandstaff et al.	Nov 2017	B2
9823142	Lehmann	Nov 2017	B2
9823148	Von Waitz et al.	Nov 2017	B2
9827818	Hu et al.	Nov 2017	B2
9827819	Luker	Nov 2017	B2
9828046	Hellholm	Nov 2017	B2
9834049	Strand	Dec 2017	B2
9834140	Windeler	Dec 2017	B2
9834184	Braunberger	Dec 2017	B2
9834187	Englert et al.	Dec 2017	B2
9835479	Endo et al.	Dec 2017	B2
9840119	Melaragni	Dec 2017	B1
9840240	Trombley et al.	Dec 2017	B2
9840277	Beech	Dec 2017	B1
9841312	Vail et al.	Dec 2017	B2
9844988	Van de Wetering	Dec 2017	B2
9851265	Buttle	Dec 2017	B2
9852346	Min	Dec 2017	B2
9854209	Aich et al.	Dec 2017	B2
9855876	Affleck	Jan 2018	B2
9856698	Pollock et al.	Jan 2018	B2
9857251	Seo et al.	Jan 2018	B2
9857255	Hagan	Jan 2018	B2
9862242	Lurie	Jan 2018	B2
9868327	Borkholder	Jan 2018	B1
9868328	Kortesalmi	Jan 2018	B2
9870653	Fritz et al.	Jan 2018	B1
9873300	Gramlow	Jan 2018	B1
9880560	Han et al.	Jan 2018	B2
9883622	Gschwendtner et al.	Feb 2018	B2
9884528	Hara	Feb 2018	B2
9884529	Davis, Jr. et al.	Feb 2018	B2
9884639	Collins	Feb 2018	B2
9885749	Penjovic et al.	Feb 2018	B2
20010003393	Cooper	Jun 2001	A1
20010007234	Scheetz	Jul 2001	A1
20010037164	Hecker	Nov 2001	A1
20010038239	Ehrlich et al.	Nov 2001	A1
20010040408	Lesesky et al.	Nov 2001	A1
20010051809	Houser et al.	Dec 2001	A1
20020004418	Mesquita et al.	Jan 2002	A1
20020030347	Korneff	Mar 2002	A1
20020030403	Lesesky et al.	Mar 2002	A1
20020032533	Sangiacomo	Mar 2002	A1
20020038193	Grunberg et al.	Mar 2002	A1
20020056579	Cooper	May 2002	A1
20020074139	Ankenman	Jun 2002	A1
20020092360	McDearmon	Jul 2002	A1
20020093245	Claerhout	Jul 2002	A1
20020107627	Funke et al.	Aug 2002	A1
20020125049	Kajiyama	Sep 2002	A1
20020149172	Field et al.	Oct 2002	A1
20020154004	Meyer	Oct 2002	A1
20020157841	Bernhardt et al.	Oct 2002	A1
20020189881	Mathias et al.	Dec 2002	A1
20020195870	Brunson et al.	Dec 2002	A1
20030010554	Grong et al.	Jan 2003	A1
20030037767	Breitegger et al.	Feb 2003	A1
20030037981	Scholer et al.	Feb 2003	A1
20030051477	Franklin	Mar 2003	A1
20030083828	Stylios	May 2003	A1
20030085562	Sparling	May 2003	A1
20030090083	Williams	May 2003	A1
20030117011	Ackley	Jun 2003	A1
20030127255	Hammonds	Jul 2003	A1
20030137126	Reuter et al.	Jul 2003	A1
20030178811	Buckner	Sep 2003	A1
20030184047	Gallego et al.	Oct 2003	A1
20030196495	Saunders et al.	Oct 2003	A1
20030209086	Schurr et al.	Nov 2003	A1
20030217606	Moore et al.	Nov 2003	A1
20030220766	Saunders et al.	Nov 2003	A1
20030226704	Aoki et al.	Dec 2003	A1
20040011579	Heckmann et al.	Jan 2004	A1
20040016304	Kaijala et al.	Jan 2004	A1
20040017285	Zielinski et al.	Jan 2004	A1
20040021291	Haug et al.	Feb 2004	A1
20040032323	Nommensen	Feb 2004	A1
20040035630	Lich et al.	Feb 2004	A1
20040035631	Schlecht et al.	Feb 2004	A1
20040042696	Kajiyama	Mar 2004	A1
20040045361	Davis et al.	Mar 2004	A1
20040045362	Davis et al.	Mar 2004	A1
20040069078	Schwendemann	Apr 2004	A1
20040079576	Knight-Newbury et al.	Apr 2004	A1
20040084876	Losee	May 2004	A1
20040104555	Atley	Jun 2004	A1
20040112246	Gain et al.	Jun 2004	A1
20040124026	Walters et al.	Jul 2004	A1
20040124605	McClure et al.	Jul 2004	A1
20040129479	Ozaki	Jul 2004	A1
20040139793	Bac	Jul 2004	A1
20040162658	Newman	Aug 2004	A1
20040169363	Fukawatase et al.	Sep 2004	A1
20040183372	Heuer et al.	Sep 2004	A1
20040195030	Eberle et al.	Oct 2004	A1
20040195031	Nagasaka	Oct 2004	A1
20040221663	Umemura et al.	Nov 2004	A1
20040251659	Amerson	Dec 2004	A1
20040252019	Paull	Dec 2004	A1
20040255680	Ortega et al.	Dec 2004	A1
20040256184	Liljeberg et al.	Dec 2004	A1
20040262883	Kerins et al.	Dec 2004	A1
20050000303	Moore et al.	Jan 2005	A1
20050006165	Scherl et al.	Jan 2005	A1
20050006946	Traechtler et al.	Jan 2005	A1
20050011694	Rosenthal et al.	Jan 2005	A1
20050012304	Pfleging et al.	Jan 2005	A1
20050017577	Eckert et al.	Jan 2005	A1
20050023050	Chidlow et al.	Feb 2005	A1
20050023064	Lich et al.	Feb 2005	A1
20050045403	Inoue	Mar 2005	A1
20050056477	Saieg et al.	Mar 2005	A1
20050061569	Pascolo et al.	Mar 2005	A1
20050087381	Tobata	Apr 2005	A1
20050087955	Kellogg	Apr 2005	A1
20050098371	Zabtcioglu	May 2005	A1
20050109548	Cooper	May 2005	A1
20050127628	Ramsey	Jun 2005	A1
20050128059	Vause	Jun 2005	A1
20050212256	Cole	Sep 2005	A1
20050248123	Symington	Nov 2005	A1
20050248125	Flynn et al.	Nov 2005	A1
20050269115	Harnetiaux et al.	Dec 2005	A1
20060032679	Wilson et al.	Feb 2006	A1
20060033308	Waldbauer et al.	Feb 2006	A1
20060042406	Ono	Mar 2006	A1
20060043767	Lunson	Mar 2006	A1
20060044121	Jarnagin	Mar 2006	A1
20060071549	Chesnut et al.	Apr 2006	A1
20060108771	Elkins et al.	May 2006	A1
20060125313	Gunne et al.	Jun 2006	A1
20060204347	Waldbauer et al.	Sep 2006	A1
20060207822	Taylor	Sep 2006	A1
20060210382	Mountz et al.	Sep 2006	A1
20060219417	Thompson et al.	Oct 2006	A1
20060220345	Schmidt	Oct 2006	A1
20060234842	Minami et al.	Oct 2006	A1
20060261572	Biondi et al.	Nov 2006	A1
20060273549	Dietz	Dec 2006	A1
20060289580	Faver et al.	Dec 2006	A1
20060290102	VanBuskirk	Dec 2006	A1
20070017715	McCann	Jan 2007	A1
20070034027	Wolfer et al.	Feb 2007	A1
20070040353	Dallaire et al.	Feb 2007	A1
20070040354	Wacker et al.	Feb 2007	A1
20070040355	Spratte et al.	Feb 2007	A1
20070058273	Ito et al.	Mar 2007	A1
20070065060	Koike et al.	Mar 2007	A1
20070068691	Smart et al.	Mar 2007	A1
20070114756	Shagbazyan	May 2007	A1
20070114759	Biondi et al.	May 2007	A1
20070131461	Treadwell et al.	Jun 2007	A1
20070132560	Nystrom et al.	Jun 2007	A1
20070140812	Ohtake et al.	Jun 2007	A1
20070152424	Deng et al.	Jul 2007	A1
20070164574	Tanabe	Jul 2007	A1
20070176394	Gehring et al.	Aug 2007	A1
20070181318	Laudick et al.	Aug 2007	A1
20070181350	Kranz et al.	Aug 2007	A1
20070194557	Caporali et al.	Aug 2007	A1
20070205580	Hamilton et al.	Sep 2007	A1
20070210538	Steprath et al.	Sep 2007	A1
20070216136	Dietz	Sep 2007	A1
20070216220	Beijersbergen Van Henegouwen et al.	Sep 2007	A1
20070222283	Skinner et al.	Sep 2007	A1
20070228814	Miller	Oct 2007	A1
20070245831	Betancor Bethencourt	Oct 2007	A1
20080029997	Wickelmaier et al.	Feb 2008	A1
20080058980	Nakano	Mar 2008	A1
20080073129	Heuer	Mar 2008	A1
20080073872	Scott	Mar 2008	A1
20080079237	Rubin	Apr 2008	A1
20080121401	Posselius et al.	May 2008	A1
20080143080	Burr	Jun 2008	A1
20080143179	Rutherford	Jun 2008	A1
20080157948	Swannie	Jul 2008	A1
20080159674	Varonis	Jul 2008	A1
20080164679	MacDougall	Jul 2008	A1
20080177435	Caporali et al.	Jul 2008	A1
20080191449	Standen	Aug 2008	A1
20080195250	Post et al.	Aug 2008	A1
20080217093	Foxwell	Sep 2008	A1
20080217883	Gustafsson et al.	Sep 2008	A1
20080238638	Phillips	Oct 2008	A1
20080257656	Skinner et al.	Oct 2008	A1
20080303647	Pare	Dec 2008	A1
20080309156	Kissel	Dec 2008	A1
20090001976	Cech et al.	Jan 2009	A1
20090008486	Torres et al.	Jan 2009	A1
20090028677	Williams et al.	Jan 2009	A1
20090069951	Liljeblad et al.	Mar 2009	A1
20090093928	Getman et al.	Apr 2009	A1
20090107734	Lucas et al.	Apr 2009	A1
20090115161	Sato	May 2009	A1
20090119030	Fang et al.	May 2009	A1
20090152831	Verhagen	Jun 2009	A1
20090189369	Thomas	Jul 2009	A1
20090205908	Hammonds	Aug 2009	A1
20090212770	Koyama	Aug 2009	A1
20090236578	Nirenberg et al.	Sep 2009	A1
20090309332	Birkholz et al.	Dec 2009	A1
20100030115	Fujimoto et al.	Feb 2010	A1
20100038213	DeMong et al.	Feb 2010	A1
20100038883	Thedford et al.	Feb 2010	A1
20100039515	Dietz	Feb 2010	A1
20100044998	Franchineau	Feb 2010	A1
20100063702	Sabelstrom et al.	Mar 2010	A1
20100066161	Fry et al.	Mar 2010	A1
20100071453	Isono	Mar 2010	A1
20100071968	Gavarini et al.	Mar 2010	A1
20100082179	Kronenberg	Apr 2010	A1
20100109286	Visser	May 2010	A1
20100161190	McCann et al.	Jun 2010	A1
20100180457	Katoh et al.	Jul 2010	A1
20100187489	Hebert	Jul 2010	A1
20100187794	MacDougall	Jul 2010	A1
20100206091	Ariav et al.	Aug 2010	A1
20100211279	Lingman et al.	Aug 2010	A1
20100230224	Hindman	Sep 2010	A1
20100262341	Alguera	Oct 2010	A1
20100262368	Kaminski	Oct 2010	A1
20100282522	Endo et al.	Nov 2010	A1
20100308291	Krones	Dec 2010	A1
20100308559	Tarasinski et al.	Dec 2010	A1
20100308809	Houldley et al.	Dec 2010	A1
20100324770	Ramsey et al.	Dec 2010	A1
20110018231	Collenberg	Jan 2011	A1
20110025482	Alguera et al.	Feb 2011	A1
20110049836	Weber et al.	Mar 2011	A1
20110050903	Vorobiev	Mar 2011	A1
20110071736	Brown et al.	Mar 2011	A1
20110073381	Endo et al.	Mar 2011	A1
20110087413	McCrickard et al.	Apr 2011	A1
20110094803	Takayasu et al.	Apr 2011	A1
20110101646	Sakita	May 2011	A1
20110155888	Jordahl	Jun 2011	A1
20110167929	Ling et al.	Jul 2011	A1
20110174553	Chaudron et al.	Jul 2011	A1
20110187143	Foster	Aug 2011	A1
20110189640	Hurd	Aug 2011	A1
20110202232	Busch et al.	Aug 2011	A1
20110209924	Endo et al.	Sep 2011	A1
20110210529	Markstaller	Sep 2011	A1
20110234388	Lesesky et al.	Sep 2011	A1
20110250038	Affleck	Oct 2011	A1
20110259651	Cleary	Oct 2011	A1
20110290576	Koestler et al.	Dec 2011	A1
20110303469	Saito et al.	Dec 2011	A1
20110303787	Bennett	Dec 2011	A1
20120000715	Saigh	Jan 2012	A1
20120007615	Todd	Jan 2012	A1
20120024081	Baker	Feb 2012	A1
20120027504	Moisy et al.	Feb 2012	A1
20120043735	Grauer et al.	Feb 2012	A1
20120059797	Prahlad et al.	Mar 2012	A1
20120187659	Nordberg	Jul 2012	A1
20120209425	Beaujot et al.	Aug 2012	A1
20120245711	Park	Sep 2012	A1
20120255646	Hasenay	Oct 2012	A1
20120283909	Dix	Nov 2012	A1
20120283925	Barlsen et al.	Nov 2012	A1
20120298387	Sauermann	Nov 2012	A1
20130056959	Mathes et al.	Mar 2013	A1
20130076007	Goode et al.	Mar 2013	A1
20130079979	Sheidler et al.	Mar 2013	A1
20130079980	Vuk et al.	Mar 2013	A1
20130080078	Wirthlin	Mar 2013	A1
20130081830	Tuttle et al.	Apr 2013	A1
20130154235	Boittin et al.	Jun 2013	A1
20130158826	Cusi	Jun 2013	A1
20130173116	Gustafson et al.	Jul 2013	A1
20130192854	Kosmicki et al.	Aug 2013	A1
20130192904	Sprecher	Aug 2013	A1
20130200248	Polzer	Aug 2013	A1
20130226390	Luo et al.	Aug 2013	A1
20130234411	Hapyuk et al.	Sep 2013	A1
20130238205	Edwards et al.	Sep 2013	A1
20130253814	Wirthlin	Sep 2013	A1
20130297154	Burchett et al.	Nov 2013	A1
20140047928	Bao et al.	Feb 2014	A1
20140054874	Masanek, Jr. et al.	Feb 2014	A1
20140062178	Panse et al.	Mar 2014	A1
20140081544	Fry	Mar 2014	A1
20140097595	Williams, Jr. et al.	Apr 2014	A1
20140110918	McCoy	Apr 2014	A1
20140151979	Puckett et al.	Jun 2014	A1
20140159340	Kimener et al.	Jun 2014	A1
20140174239	Nagata et al.	Jun 2014	A1
20140183841	Jones	Jul 2014	A1
20140190275	McILravey	Jul 2014	A1
20140202776	Kane et al.	Jul 2014	A1
20140216169	Romo et al.	Aug 2014	A1
20140224553	Ozawa	Aug 2014	A1
20140224588	Van Seumeren	Aug 2014	A1
20140237868	Whitchurch et al.	Aug 2014	A1
20140262918	Chu	Sep 2014	A1
20140288769	Trombley et al.	Sep 2014	A1
20140288795	Albright et al.	Sep 2014	A1
20140298916	Duan et al.	Oct 2014	A1
20140309840	Woolf et al.	Oct 2014	A1
20140360282	Gie Ibl	Dec 2014	A1
20150009010	Biemer	Jan 2015	A1
20150012199	Mederer et al.	Jan 2015	A1
20150030423	Reid	Jan 2015	A1
20150043711	Den Heeten et al.	Feb 2015	A1
20150069736	Trevino et al.	Mar 2015	A1
20150069737	McAllister	Mar 2015	A1
20150105963	Blackwell et al.	Apr 2015	A1
20150105975	Dunn	Apr 2015	A1
20150135890	Pertile	May 2015	A1
20150137482	Woolf et al.	May 2015	A1
20150203156	Hafner et al.	Jul 2015	A1
20150210257	Matoy et al.	Jul 2015	A1
20150231938	Gentner	Aug 2015	A1
20150253151	Inberg et al.	Sep 2015	A1
20150275991	De Leon	Oct 2015	A1
20150290988	Masten	Oct 2015	A1
20150306928	McCollum	Oct 2015	A1
20150314818	Gaston	Nov 2015	A1
20150321697	Lu et al.	Nov 2015	A1
20150343865	Hile et al.	Dec 2015	A1
20150344277	Simons	Dec 2015	A1
20150353063	Tuhro et al.	Dec 2015	A1
20150374558	Strong et al.	Dec 2015	A1
20160023525	Lavoie	Jan 2016	A1
20160023642	Smith et al.	Jan 2016	A1
20160029543	Stich et al.	Feb 2016	A1
20160031357	Collins	Feb 2016	A1
20160039480	Pichlmaier	Feb 2016	A1
20160052548	Singh et al.	Feb 2016	A1
20160059888	Bradley et al.	Mar 2016	A1
20160075281	Singh et al.	Mar 2016	A1
20160114844	Harris	Apr 2016	A1
20160121790	Mains, Jr.	May 2016	A1
20160137204	Morselli	May 2016	A1
20160144906	Han et al.	May 2016	A1
20160159176	McCormick et al.	Jun 2016	A1
20160167630	Wolf	Jun 2016	A1
20160185170	McAllister	Jun 2016	A1
20160187185	Smith	Jun 2016	A1
20160229394	Fujii et al.	Aug 2016	A1
20160229453	Yang et al.	Aug 2016	A1
20160231165	Fredrickson	Aug 2016	A1
20160236526	Shepard	Aug 2016	A1
20160236659	Diehl et al.	Aug 2016	A1
20160243908	Lannen et al.	Aug 2016	A1
20160251005	Morselli et al.	Sep 2016	A1
20160255760	Sauder et al.	Sep 2016	A1
20160257176	Tabellini et al.	Sep 2016	A1
20160264046	Bochenek et al.	Sep 2016	A1
20160280023	Olesen et al.	Sep 2016	A1
20160284217	Lee et al.	Sep 2016	A1
20160297361	Drazan et al.	Oct 2016	A1
20160297432	Fletcher et al.	Oct 2016	A1
20160303933	Nowakowski	Oct 2016	A1
20160304054	Mansuri et al.	Oct 2016	A1
20160309807	Stanzione	Oct 2016	A1
20160311280	Gerbrandt et al.	Oct 2016	A1
20160318493	Drako	Nov 2016	A1
20160332606	Buchner et al.	Nov 2016	A1
20160340122	Lindblom	Nov 2016	A1
20160375736	Wilson	Dec 2016	A1
20160375831	Wang et al.	Dec 2016	A1
20170008357	Sallis, Sr.	Jan 2017	A1
20170008559	Shepard	Jan 2017	A1
20170015163	Sielhorst	Jan 2017	A1
20170016757	Strong et al.	Jan 2017	A1
20170043806	Muharemovic et al.	Feb 2017	A1
20170043807	Shepard	Feb 2017	A1
20170049012	Hoshikawa et al.	Feb 2017	A1
20170072753	Kadnikov et al.	Mar 2017	A1
20170074634	Yoon et al.	Mar 2017	A1
20170074700	Strnad et al.	Mar 2017	A1
20170082509	Bushnell et al.	Mar 2017	A1
20170086346	Payne et al.	Mar 2017	A1
20170088104	Risse et al.	Mar 2017	A1
20170089777	Obata et al.	Mar 2017	A1
20170089778	Toyoshima et al.	Mar 2017	A1
20170100974	Smith	Apr 2017	A1
20170101141	Booher et al.	Apr 2017	A1
20170106869	Lavoie et al.	Apr 2017	A1
20170113745	Cook et al.	Apr 2017	A1
20170130768	Matsuda et al.	May 2017	A1
20170137002	Taneyhill et al.	May 2017	A1
20170144497	Guntersweiler	May 2017	A1
20170144714	Dupay et al.	May 2017	A1
20170151845	Allcorn et al.	Jun 2017	A1
20170151935	Prohaszka et al.	Jun 2017	A1
20170158233	Herzog et al.	Jun 2017	A1
20170174179	Schumacher et al.	Jun 2017	A1
20170174275	Mohamad Jembari et al.	Jun 2017	A1
20170184460	Matsuzawa et al.	Jun 2017	A1
20170188505	Potier et al.	Jul 2017	A1
20170197598	Lesher et al.	Jul 2017	A1
20170211969	Waite et al.	Jul 2017	A1
20170211998	Smith et al.	Jul 2017	A1
20170217411	Albright et al.	Aug 2017	A1
20170218999	Brown	Aug 2017	A1
20170219447	Ovaere et al.	Aug 2017	A1
20170225692	Ghannam et al.	Aug 2017	A1
20170228145	Schneider et al.	Aug 2017	A1
20170231146	Romig et al.	Aug 2017	A1
20170232893	Ebner et al.	Aug 2017	A1
20170240152	Strange et al.	Aug 2017	A1
20170240153	Ripley et al.	Aug 2017	A1
20170241828	Reichow et al.	Aug 2017	A1
20170245417	Frascella	Aug 2017	A1
20170246521	deGreef et al.	Aug 2017	A1
20170253442	Kimener et al.	Sep 2017	A1
20170254694	Toigo	Sep 2017	A1
20170259791	Kimener	Sep 2017	A1
20170262717	Drazan et al.	Sep 2017	A1
20170276163	Bernhardt	Sep 2017	A1
20170282658	Shepard	Oct 2017	A1
20170297391	Pilliod	Oct 2017	A1
20170297490	Lynam et al.	Oct 2017	A1
20170305214	Gray	Oct 2017	A1
20170305215	Scheips et al.	Oct 2017	A1
20170305436	Maskell et al.	Oct 2017	A1
20170313141	Casasanta	Nov 2017	A1
20170314986	Dyal	Nov 2017	A1
20170326929	Chmelar et al.	Nov 2017	A1
20170334255	McAllister	Nov 2017	A1
20170334256	Scheips et al.	Nov 2017	A1
20170341917	Adams	Nov 2017	A1
20170349231	Wood	Dec 2017	A1
20170356818	Gouko et al.	Dec 2017	A1
20170359941	Czapka et al.	Dec 2017	A1
20170360279	Gafford et al.	Dec 2017	A1
20170363490	Matsuzawa et al.	Dec 2017	A1
20170368701	Gester et al.	Dec 2017	A1
20170368747	Nolet et al.	Dec 2017	A1
20170368897	Brickley et al.	Dec 2017	A1
20170370764	Xu et al.	Dec 2017	A1
20170370788	Neuschaefer-Rube et al.	Dec 2017	A1
20180000114	Grampassi et al.	Jan 2018	A1
20180001720	McAllister	Jan 2018	A1
20180001721	Huger et al.	Jan 2018	A1
20180001928	Lavoie et al.	Jan 2018	A1
20180003546	Mignon et al.	Jan 2018	A1
20180029155	Garza	Feb 2018	A1
20180029429	Janardhana et al.	Feb 2018	A1
20180037209	Hecker et al.	Feb 2018	A1
20180039266	Dotzler et al.	Feb 2018	A1
20180039278	Huger et al.	Feb 2018	A1
20190039865	Verbeek	Feb 2019	A1

Foreign Referenced Citations (586)

Number	Date	Country
102014217801	Mar 2016	DE
192871	Feb 1990	EP
523880	Nov 1994	EP
610702	May 1995	EP
675820	Oct 1995	EP
694422	Jan 1996	EP
699899	Mar 1996	EP
700822	Mar 1996	EP
737608	Oct 1996	EP
697314	Mar 1997	EP
773075	Oct 1997	EP
798615	Oct 1997	EP
823368	Feb 1998	EP
625696	Mar 1998	EP
695655	Apr 1998	EP
667252	May 1998	EP
760717	May 1998	EP
730140	Aug 1998	EP
765251	Sep 1998	EP
816809	Oct 1998	EP
602054	Dec 1998	EP
595213	Jan 1999	EP
740139	Jan 1999	EP
625697	Mar 1999	EP
919165	Jun 1999	EP
693250	Sep 1999	EP
824386	Sep 1999	EP
728600	Oct 1999	EP
925456	Dec 1999	EP
650139	Jan 2000	EP
832000	Feb 2000	EP
679326	Mar 2000	EP
861179	Mar 2000	EP
983932	Mar 2000	EP
985342	Mar 2000	EP
712769	Apr 2000	EP
739226	Apr 2000	EP
644417	May 2000	EP
688687	May 2000	EP
985563	May 2000	EP
1002671	Jun 2000	EP
1012595	Jun 2000	EP
1002672	Aug 2000	EP
713638	Oct 2000	EP
960039	Oct 2000	EP
1049616	Nov 2000	EP
713637	Dec 2000	EP
941905	Dec 2000	EP
799730	Jan 2001	EP
799732	Jan 2001	EP
1084870	Mar 2001	EP
1084871	Mar 2001	EP
1086360	Mar 2001	EP
1103172	May 2001	EP
799731	Jun 2001	EP
884570	Jun 2001	EP
1106486	Jun 2001	EP
823343	Jul 2001	EP
1120334	Aug 2001	EP
921056	Sep 2001	EP
828622	Oct 2001	EP
1147973	Oct 2001	EP
1150109	Oct 2001	EP
881139	Nov 2001	EP
918655	Nov 2001	EP
950549	Nov 2001	EP
1151261	Nov 2001	EP
928250	Dec 2001	EP
953490	Dec 2001	EP
1160105	Dec 2001	EP
1162090	Dec 2001	EP
843956	Jan 2002	EP
1016572	Jan 2002	EP
1084872	Jan 2002	EP
1165330	Jan 2002	EP
1170155	Jan 2002	EP
1086835	Feb 2002	EP
1177889	Feb 2002	EP
900682	Apr 2002	EP
1160104	Apr 2002	EP
1192068	Apr 2002	EP
1195273	Apr 2002	EP
1195274	Apr 2002	EP
1142732	May 2002	EP
1182062	May 2002	EP
1138985	Jun 2002	EP
1216856	Jun 2002	EP
794110	Jul 2002	EP
1153770	Jul 2002	EP
1155881	Jul 2002	EP
1199547	Jul 2002	EP
1117584	Aug 2002	EP
1189772	Aug 2002	EP
1189772	Aug 2002	EP
1225067	Aug 2002	EP
1225068	Aug 2002	EP
1233895	Aug 2002	EP
876929	Sep 2002	EP
1040020	Sep 2002	EP
1007925	Oct 2002	EP
1251025	Oct 2002	EP
1253027	Oct 2002	EP
1038744	Dec 2002	EP
1225069	Dec 2002	EP
1279527	Jan 2003	EP
1279528	Jan 2003	EP
914264	Mar 2003	EP
1312492	May 2003	EP
848805	Jul 2003	EP
1245439	Jul 2003	EP
968852	Aug 2003	EP
991559	Sep 2003	EP
1295783	Sep 2003	EP
849207	Oct 2003	EP
1022164	Oct 2003	EP
1163529	Oct 2003	EP
1308358	Oct 2003	EP
1359085	Nov 2003	EP
1359321	Nov 2003	EP
1249365	Jan 2004	EP
1099575	Feb 2004	EP
1389541	Feb 2004	EP
1326772	Mar 2004	EP
1405738	Apr 2004	EP
1011994	May 2004	EP
1418843	May 2004	EP
1422366	May 2004	EP
1447246	Aug 2004	EP
1448431	Aug 2004	EP
1448952	Aug 2004	EP
1449115	Aug 2004	EP
1450658	Sep 2004	EP
1451058	Sep 2004	EP
1456043	Sep 2004	EP
1116431	Oct 2004	EP
1289781	Oct 2004	EP
1468899	Oct 2004	EP
1471339	Oct 2004	EP
1350683	Nov 2004	EP
1476736	Nov 2004	EP
1116013	Dec 2004	EP
1129606	Dec 2004	EP
1455207	Dec 2004	EP
1485285	Dec 2004	EP
1486375	Dec 2004	EP
1499517	Jan 2005	EP
1254036	Feb 2005	EP
1400423	Mar 2005	EP
1171717	Apr 2005	EP
1288026	Apr 2005	EP
1486400	Apr 2005	EP
1093419	Jul 2005	EP
1347676	Jul 2005	EP
1375279	Aug 2005	EP
1562809	Aug 2005	EP
1334847	Sep 2005	EP
1580043	Sep 2005	EP
1301362	Dec 2005	EP
1380444	Dec 2005	EP
1499510	Dec 2005	EP
1604179	Dec 2005	EP
961722	Jan 2006	EP
1227945	Jan 2006	EP
1400379	Feb 2006	EP
1403102	Feb 2006	EP
1462280	Feb 2006	EP
1627803	Feb 2006	EP
1320734	Mar 2006	EP
1396417	Mar 2006	EP
1633599	Mar 2006	EP
1351340	Apr 2006	EP
1386761	Apr 2006	EP
1535765	Apr 2006	EP
1650095	Apr 2006	EP
1029440	Jun 2006	EP
1238577	Jun 2006	EP
1673274	Jun 2006	EP
1186510	Jul 2006	EP
1318066	Jul 2006	EP
1683696	Jul 2006	EP
1541385	Aug 2006	EP
1687158	Aug 2006	EP
1688727	Aug 2006	EP
1688728	Aug 2006	EP
1691996	Aug 2006	EP
1111353	Sep 2006	EP
1200276	Sep 2006	EP
1697207	Sep 2006	EP
1107894	Oct 2006	EP
1709419	Oct 2006	EP
1710129	Oct 2006	EP
1713609	Oct 2006	EP
1597098	Nov 2006	EP
1717134	Nov 2006	EP
1735168	Dec 2006	EP
1205097	Jan 2007	EP
1609344	Jan 2007	EP
1749193	Feb 2007	EP
1750108	Feb 2007	EP
1422124	Mar 2007	EP
1593552	Mar 2007	EP
1574399	Apr 2007	EP
1495883	May 2007	EP
1788363	May 2007	EP
1788364	May 2007	EP
1799540	Jun 2007	EP
1813513	Aug 2007	EP
1820708	Aug 2007	EP
1293363	Sep 2007	EP
1836063	Sep 2007	EP
1848599	Oct 2007	EP
1358453	Nov 2007	EP
1734355	Nov 2007	EP
1862050	Dec 2007	EP
1867499	Dec 2007	EP
1336824	Jan 2008	EP
1634729	Jan 2008	EP
1778507	Jan 2008	EP
1877268	Jan 2008	EP
1713649	Feb 2008	EP
1891344	Feb 2008	EP
1557299	Mar 2008	EP
1559592	Mar 2008	EP
1900552	Mar 2008	EP
1900609	Mar 2008	EP
1900610	Mar 2008	EP
1902917	Mar 2008	EP
1475253	Apr 2008	EP
1598249	Apr 2008	EP
1609345	Apr 2008	EP
1740400	Apr 2008	EP
1904351	Apr 2008	EP
1904357	Apr 2008	EP
1607248	May 2008	EP
1921432	May 2008	EP
1924451	May 2008	EP
1847448	Jun 2008	EP
1826033	Jul 2008	EP
1918137	Jul 2008	EP
1942037	Jul 2008	EP
1943138	Jul 2008	EP
1944224	Jul 2008	EP
1949822	Jul 2008	EP
1454808	Sep 2008	EP
1968846	Sep 2008	EP
1998965	Dec 2008	EP
2008892	Dec 2008	EP
2018981	Jan 2009	EP
1425209	Feb 2009	EP
1549124	Feb 2009	EP
1584499	Feb 2009	EP
2022654	Feb 2009	EP
2023111	Feb 2009	EP
2025536	Feb 2009	EP
2032417	Mar 2009	EP
1710100	May 2009	EP
1769949	May 2009	EP
1802516	May 2009	EP
2057444	May 2009	EP
2058151	May 2009	EP
2059400	May 2009	EP
2059400	May 2009	EP
2060892	May 2009	EP
1623913	Jul 2009	EP
2075562	Jul 2009	EP
1910152	Aug 2009	EP
2088062	Aug 2009	EP
2090481	Aug 2009	EP
2090874	Aug 2009	EP
2091807	Aug 2009	EP
1757466	Oct 2009	EP
1834852	Oct 2009	EP
1861306	Oct 2009	EP
2108553	Oct 2009	EP
1812278	Nov 2009	EP
1902870	Nov 2009	EP
2116400	Nov 2009	EP
2119927	Nov 2009	EP
1886847	Dec 2009	EP
1905617	Dec 2009	EP
1948498	Dec 2009	EP
1278656	Jan 2010	EP
2141472	Jan 2010	EP
1107893	Feb 2010	EP
1912852	Feb 2010	EP
1987967	Feb 2010	EP
2079627	Feb 2010	EP
2149476	Feb 2010	EP
2155507	Feb 2010	EP
1702812	Mar 2010	EP
1787872	Mar 2010	EP
2164638	Mar 2010	EP
2164733	Mar 2010	EP
1886845	Apr 2010	EP
1917161	Apr 2010	EP
1917188	Apr 2010	EP
1932411	Apr 2010	EP
2176632	Apr 2010	EP
1927485	May 2010	EP
2181002	May 2010	EP
2184182	May 2010	EP
1561610	Jun 2010	EP
1810561	Jun 2010	EP
1812261	Jun 2010	EP
1933121	Jun 2010	EP
1970224	Jun 2010	EP
2118616	Jun 2010	EP
2199166	Jun 2010	EP
2208034	Jul 2010	EP
2210002	Jul 2010	EP
1210257	Aug 2010	EP
1298026	Aug 2010	EP
1821090	Aug 2010	EP
1995085	Aug 2010	EP
1612081	Sep 2010	EP
1784326	Sep 2010	EP
1916127	Sep 2010	EP
2042352	Sep 2010	EP
2090500	Sep 2010	EP
2129561	Sep 2010	EP
2240796	Oct 2010	EP
2243883	Oct 2010	EP
2253529	Nov 2010	EP
1638792	Dec 2010	EP
2258586	Dec 2010	EP
2260278	Dec 2010	EP
2261066	Dec 2010	EP
1562811	Jan 2011	EP
1913804	Jan 2011	EP
2100757	Jan 2011	EP
2277724	Jan 2011	EP
2280263	Feb 2011	EP
1530521	Mar 2011	EP
2289776	Mar 2011	EP
2301322	Mar 2011	EP
1818245	Apr 2011	EP
2151373	Apr 2011	EP
2311673	Apr 2011	EP
2093134	May 2011	EP
2110272	May 2011	EP
2189307	May 2011	EP
1472122	Jun 2011	EP
1896317	Jun 2011	EP
1676763	Jul 2011	EP
1792791	Jul 2011	EP
1919745	Jul 2011	EP
2021227	Jul 2011	EP
2164734	Jul 2011	EP
2110271	Aug 2011	EP
2222487	Aug 2011	EP
2349777	Aug 2011	EP
2356471	Aug 2011	EP
2103458	Sep 2011	EP
2165901	Sep 2011	EP
2291646	Sep 2011	EP
2363307	Sep 2011	EP
2373532	Oct 2011	EP
1849013	Nov 2011	EP
2138333	Nov 2011	EP
2384941	Nov 2011	EP
2099626	Dec 2011	EP
2223831	Dec 2011	EP
2394890	Dec 2011	EP
2300289	Jan 2012	EP
2401182	Jan 2012	EP
2404800	Jan 2012	EP
2405263	Jan 2012	EP
2141034	Feb 2012	EP
2417007	Feb 2012	EP
2417008	Feb 2012	EP
2432672	Mar 2012	EP
1557300	Apr 2012	EP
1902289	Apr 2012	EP
2436540	Apr 2012	EP
2439504	Apr 2012	EP
2447118	May 2012	EP
2450248	May 2012	EP
2289773	Jun 2012	EP
2274967	Jul 2012	EP
2316714	Aug 2012	EP
2480442	Aug 2012	EP
2492173	Aug 2012	EP
2289717	Sep 2012	EP
2493732	Sep 2012	EP
2503062	Sep 2012	EP
2303649	Oct 2012	EP
2511110	Oct 2012	EP
2092815	Nov 2012	EP
2335952	Nov 2012	EP
2520447	Nov 2012	EP
2368726	Jan 2013	EP
2542463	Jan 2013	EP
2542871	Jan 2013	EP
2543776	Jan 2013	EP
2163446	Feb 2013	EP
2344386	Feb 2013	EP
2556973	Feb 2013	EP
2570312	Mar 2013	EP
1606984	Apr 2013	EP
2576297	Apr 2013	EP
2584331	Apr 2013	EP
2370308	May 2013	EP
2502763	May 2013	EP
2588852	May 2013	EP
2266820	Jun 2013	EP
2607159	Jun 2013	EP
2607873	Jun 2013	EP
2132539	Aug 2013	EP
2268528	Aug 2013	EP
2433482	Aug 2013	EP
2626678	Aug 2013	EP
2340699	Sep 2013	EP
2366564	Sep 2013	EP
2540530	Sep 2013	EP
2540531	Sep 2013	EP
2634073	Sep 2013	EP
2654394	Oct 2013	EP
2683164	Jan 2014	EP
2295268	Mar 2014	EP
2708386	Mar 2014	EP
2708865	Mar 2014	EP
2711207	Mar 2014	EP
2055542	Apr 2014	EP
2722204	Apr 2014	EP
2722215	Apr 2014	EP
2729333	May 2014	EP
2729778	May 2014	EP
2730903	May 2014	EP
2734027	May 2014	EP
1024036	Jun 2014	EP
2343201	Jun 2014	EP
2602132	Jun 2014	EP
2316669	Jul 2014	EP
2417009	Jul 2014	EP
2608186	Jul 2014	EP
2751536	Jul 2014	EP
2752650	Jul 2014	EP
2717239	Aug 2014	EP
2717240	Aug 2014	EP
2761708	Aug 2014	EP
2767417	Aug 2014	EP
2767418	Aug 2014	EP
2589504	Sep 2014	EP
2594534	Sep 2014	EP
2772739	Sep 2014	EP
2776258	Sep 2014	EP
2781378	Sep 2014	EP
2635447	Oct 2014	EP
2788749	Oct 2014	EP
2793009	Oct 2014	EP
2533942	Nov 2014	EP
2801488	Nov 2014	EP
2817180	Dec 2014	EP
2817187	Dec 2014	EP
2817600	Dec 2014	EP
2819858	Jan 2015	EP
2390145	Feb 2015	EP
2838742	Feb 2015	EP
2848480	Mar 2015	EP
2848502	Mar 2015	EP
2415620	Apr 2015	EP
2856099	Apr 2015	EP
2452839	May 2015	EP
2497658	May 2015	EP
2608971	May 2015	EP
2870446	May 2015	EP
2874855	May 2015	EP
2417306	Jun 2015	EP
2548764	Jun 2015	EP
2851667	Jun 2015	EP
2269880	Jul 2015	EP
2606653	Jul 2015	EP
2889592	Jul 2015	EP
2890956	Jul 2015	EP
2891586	Jul 2015	EP
2892738	Jul 2015	EP
2899101	Jul 2015	EP
2651678	Aug 2015	EP
2905155	Aug 2015	EP
2907710	Aug 2015	EP
2521665	Sep 2015	EP
2918469	Sep 2015	EP
2636546	Oct 2015	EP
2865585	Oct 2015	EP
2934962	Oct 2015	EP
2934964	Oct 2015	EP
2362201	Feb 2016	EP
2984914	Feb 2016	EP
2984915	Feb 2016	EP
2511109	Mar 2016	EP
2988958	Mar 2016	EP
2988973	Mar 2016	EP
2988983	Mar 2016	EP
2993373	Mar 2016	EP
2994355	Mar 2016	EP
2997429	Mar 2016	EP
2602134	Apr 2016	EP
3003802	Apr 2016	EP
3007917	Apr 2016	EP
3009923	Apr 2016	EP
2139732	May 2016	EP
2676820	May 2016	EP
2839173	May 2016	EP
2523837	Jun 2016	EP
2558338	Jun 2016	EP
2714436	Jun 2016	EP
2727752	Jun 2016	EP
2758258	Jun 2016	EP
3028882	Jun 2016	EP
3034373	Jun 2016	EP
3036148	Jun 2016	EP
3036986	Jun 2016	EP
3040235	Jul 2016	EP
3046805	Jul 2016	EP
3060894	Aug 2016	EP
2906923	Sep 2016	EP
3000671	Sep 2016	EP
3068640	Sep 2016	EP
3072710	Sep 2016	EP
2714437	Oct 2016	EP
2893793	Oct 2016	EP
3078513	Oct 2016	EP
3078515	Oct 2016	EP
3081405	Oct 2016	EP
3084379	Oct 2016	EP
3085217	Oct 2016	EP
2594455	Nov 2016	EP
2931569	Nov 2016	EP
3098111	Nov 2016	EP
2326540	Dec 2016	EP
2602133	Dec 2016	EP
3099545	Dec 2016	EP
2272692	Jan 2017	EP
3110636	Jan 2017	EP
3122618	Feb 2017	EP
3123697	Feb 2017	EP
3128299	Feb 2017	EP
3128759	Feb 2017	EP
3133381	Feb 2017	EP
3012180	Mar 2017	EP
3134281	Mar 2017	EP
2197718	Apr 2017	EP
2664506	Apr 2017	EP
2946647	Apr 2017	EP
3152090	Apr 2017	EP
3155886	Apr 2017	EP
2928734	May 2017	EP
3162666	May 2017	EP
3163274	May 2017	EP
3164325	May 2017	EP
3164686	May 2017	EP
3165974	May 2017	EP
3166825	May 2017	EP
2589503	Jun 2017	EP
3177515	Jun 2017	EP
3180217	Jun 2017	EP
2987694	Jul 2017	EP
3188480	Jul 2017	EP
2535212	Aug 2017	EP
2893527	Aug 2017	EP
2893792	Aug 2017	EP
2918452	Aug 2017	EP
2981796	Aug 2017	EP
3008985	Aug 2017	EP
3197692	Aug 2017	EP
3201586	Aug 2017	EP
3204275	Aug 2017	EP
3209509	Aug 2017	EP
2729401	Sep 2017	EP
3114440	Sep 2017	EP
3222129	Sep 2017	EP
2546627	Oct 2017	EP
2573041	Oct 2017	EP
2803618	Oct 2017	EP
3227130	Oct 2017	EP
2648950	Nov 2017	EP
3239009	Nov 2017	EP
3246685	Nov 2017	EP
3249368	Nov 2017	EP
3255214	Dec 2017	EP
3260832	Dec 2017	EP
2718094	Jan 2018	EP
3065957	Jan 2018	EP
3261890	Jan 2018	EP
3265330	Jan 2018	EP
WO-2018019859	Feb 2018	WO

Non-Patent Literature Citations (5)

Entry
Office Action, U.S. Appl. No. 15/815,640, dated Jul. 11, 2019, 14 pages.
Office Action, U.S. Appl. No. 16/523,418, dated Sep. 30, 3019, 20 pages.
The European Search Report dated Dec. 7, 2018.
International Search Report for PCT/US2019/019820 dated May 8, 2019 (2 pgs.).
K. Kasten et al., “iBolt Technology—A Weight Sensing System for Advanced Passenger Safety”; Advanced Microsystems for Automotive Applications 2006; pp. 171-186 (2006).

Related Publications (1)

	Number	Date	Country
	20190265112 A1	Aug 2019	US

Provisional Applications (4)

Number	Date	Country
62635848	Feb 2018	US
62635869	Feb 2018	US
62635890	Feb 2018	US
62677378	May 2018	US

Towing systems and methods using magnetic field sensing

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Foreign Referenced Citations (586)

Non-Patent Literature Citations (5)

Related Publications (1)

Provisional Applications (4)