Patent Grant
9592851
The disclosure made herein relates generally to driver assist and active safety technologies in vehicles, and more particularly to a trailer backup assist system that is configured with multiple modes to control guidance of the trailer.
Reversing a vehicle while towing a trailer can be challenging for many drivers, particularly for drivers that drive with a trailer on an infrequent basis or with various types of trailers. One reason for such difficulty may be that backing a vehicle with an attached trailer requires steering inputs that are opposite to steering inputs when backing the vehicle without a trailer attached to the vehicle. Another reason for such difficulty may be that small errors in steering while backing a vehicle with an attached trailer are amplified, which may cause the trailer to quickly depart from a desired path. An additional reason backing a trailer can prove to be difficult is the need to control the vehicle in a manner that limits the potential for a jackknife condition to occur. A jackknife condition may occur when steering of the vehicle cannot control the hitch angle, such that the hitch angle would continue to increase and the vehicle must be pulled forward to relieve the hitch angle. However, in addition to the jackknife condition creating the inconvenient situation where the vehicle must be pulled forward, it can also lead to contact between the vehicle and trailer, thereby damaging the trailer and/or the vehicle.
According to one aspect of the present invention, a method is provided for reversing a trailer with a vehicle that includes determining a kinematic relationship of the trailer and the vehicle. The method also includes sensing a hitch angle between the trailer and the vehicle. In addition, the method includes selecting a static orientation of the trailer or the vehicle to define a reference path in line with the static orientation. Further, the method includes steering the vehicle to guide the trailer on the reference path based on the hitch angle and the kinematic relationship.
According to another aspect of the present invention, a method is provided for reversing a trailer with a vehicle that includes sensing a hitch angle between the trailer and the vehicle. The method also includes selecting a longitudinal direction of the trailer or the vehicle in a static orientation or a curvature based on the hitch angle in the static orientation to define a reference path. Further, the method includes steering the vehicle to guide the trailer on the reference path.
According to a further aspect of the present invention, a trailer backup assist system provides a sensor that senses a hitch angle between a trailer and a vehicle. The trailer backup assist system also provides a selection device for selecting a longitudinal direction of the trailer or the vehicle in a static orientation. Further, the trailer backup assist system provides a controller that generates a steering command to the vehicle when reversing based on the hitch angle to guide the trailer in the selected longitudinal direction.
These and other aspects, objects, and features of the present invention will be understood and appreciated by those skilled in the art upon studying the following specification, claims, and appended drawings.
In the drawings:
For purposes of description herein, it is to be understood that the disclosed trailer backup assist system and the related methods may assume various alternative embodiments and orientations, except where expressly specified to the contrary. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification are simply exemplary embodiments of the inventive concepts defined in the appended claims. While various aspects of the trailer backup assist system and the related methods are described with reference to a particular illustrative embodiment, the disclosed invention is not limited to such embodiments, and additional modifications, applications, and embodiments may be implemented without departing from the disclosed invention. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise.
Referring to
With reference to the embodiment shown in
Still referring to
With reference to the embodiment of the trailer backup assist system 10 shown in
As also shown in
In alternative embodiments, some vehicles have a power assist steering system 62 that allows a steering wheel 68 to be partially decoupled from movement of the steered wheels 64 of such a vehicle. Accordingly, the steering wheel 68 can be rotated independent of the manner in which the power assist steering system 62 of the vehicle controls the steered wheels 64 (e.g., autonomous steering as commanded by the trailer backup assist system 10). As such, in these types of vehicles where the steering wheel 68 can be selectively decoupled from the steered wheels 64 to allow independent operation thereof, the steering wheel 68 may be used as a steering input device 18 for the trailer backup assist system 10, as disclosed in greater detail herein.
Referring again to the embodiment illustrated in
As illustrated in
The powertrain control system 74, as shown in the embodiment illustrated in
With additional reference to
As further illustrated in
Still referring to the embodiment shown in
With reference to
As shown in
δ: steering angle at steered front wheels of the vehicle 14;
α: yaw angle of the vehicle 14;
β: yaw angle of the trailer 12;
γ: hitch angle (γ=β−α);
W: wheel base of the vehicle 14;
L: length between hitch point and rear axle of the vehicle 14;
D: distance between hitch point and axle of the trailer 12 or effective axle for a multiple axle trailer 12 (axle length may be an equivalent); and
r2: curvature radius for the trailer 12.
One embodiment of a kinematic relationship between trailer path radius of curvature r2 at the midpoint of an axle of the trailer 12, steering angle δ of the steered wheels 64 of the vehicle 14, and the hitch angle γ can be expressed in the equation provided below. As such, if the hitch angle γ is provided, the trailer path curvature κ2 can be controlled based on regulating the steering angle δ (where) {dot over (β)} is trailer yaw rate and {dot over (η)} is trailer velocity).
This relationship can be expressed to provide the steering angle δ as a function of trailer path curvature κ2 and hitch angle γ.
Accordingly, for a particular vehicle and trailer combination, certain parameters (e.g., D, W and L) of the kinematic relationship are constant and assumed known. V is the vehicle longitudinal speed and g is the acceleration due to gravity. K is a speed dependent parameter which when set to zero makes the calculation of steering angle independent of vehicle speed. For example, vehicle-specific parameters of the kinematic relationship can be predefined in an electronic control system of the vehicle 14 and trailer-specific parameters of the kinematic relationship can be inputted by a driver of the vehicle 14, determined from sensed trailer behavior in response to vehicle steering commands, or otherwise determined from signals provided by the trailer 12. Trailer path curvature κ2 is determined from the driver input via the steering input device 18. Through the use of the equation for providing steering angle, a corresponding steering command can be generated for controlling the power assist steering system 62 of the vehicle 14.
In an additional embodiment of the curvature controller 28, an assumption may be made that a longitudinal distance L between the pivoting connection and the rear axle of the vehicle 14 is equal to zero for purposes of operating the trailer backup assist system 10 when a gooseneck trailer 12 or other similar trailer 12 is connected with the a hitch ball or a fifth wheel connector located over a rear axle of the vehicle 14. The assumption essentially assumes that the pivoting connection with the trailer 12 is substantially aligned with the rear axle. When such an assumption is made, the curvature controller 28 may generate the steering angle command for the vehicle 14 as a function independent of the distance L between the pivoting connection and the rear axle of the vehicle 14. It is appreciated that the gooseneck trailer 12 mentioned generally refers to the tongue 36 configuration being elevated to attach with the vehicle 14 at an elevated location over the rear axle, such as within a bed of a truck, whereby embodiments of the gooseneck trailer 12 may include flatbed cargo areas, enclosed cargo areas, campers, cattle trailers, horse trailers, lowboy trailers, and other conceivable trailers with such a tongue configuration.
Yet another embodiment of the curvature controller 28 of the trailer backup assist system 10 is illustrated in
As also shown in
Where,
κ2 represents the desired curvature of the trailer 12 or 1/r2 as shown in
δ represents the steering angle;
L represents the distance from the rear axle of the vehicle 14 to the hitch pivot point;
D represents the distance from the hitch pivot point to the axle of the trailer 12; and
W represents the distance from the rear axle to the front axle of the vehicle 14.
With further reference to
As also shown in
It is contemplated that the PI controller may have gain terms based on trailer length D since shorter trailers will generally have faster dynamics. In addition, the hitch angle regulator 90 may be configured to prevent the desired hitch angle γ(d) to reach or exceed a jackknife angle γ(j), as computed by the controller or otherwise determined by the trailer backup assist system 10, as disclosed in greater detail herein.
Referring now to
A kinematic model representation of the vehicle 14 and the trailer 12 can be used to determine a jackknife angle for the vehicle-trailer combination. Accordingly, with reference to
Solving the above equation for hitch angle γ allows jackknife angle γ(j) to be determined. This solution, which is shown in the following equation, can be used in implementing trailer backup assist functionality in accordance with the disclosed subject matter for monitoring hitch angle γ in relation to jackknife angle.
where,
a=L2 tan2 δ(max)+W2;
b=2 LD tan2 δ(max); and
c=D2 tan2δ(max)−W2.
In certain instances of backing the trailer 12, a jackknife enabling condition can arise based on current operating parameters of the vehicle 14 in combination with a corresponding hitch angle γ. This condition can be indicated when one or more specified vehicle operating thresholds are met while a particular hitch angle γ is present. For example, although the particular hitch angle γ is not currently at the jackknife angle for the vehicle 14 and attached trailer 12, certain vehicle operating parameters can lead to a rapid (e.g., uncontrolled) transition of the hitch angle γ to the jackknife angle for a current commanded trailer path curvature and/or can reduce an ability to steer the trailer 12 away from the jackknife angle. One reason for a jackknife enabling condition is that trailer curvature control mechanisms (e.g., those in accordance with the disclosed subject matter) generally calculate steering commands at an instantaneous point in time during backing of a trailer 12. However, these calculations will typically not account for lag in the steering control system of the vehicle 14 (e.g., lag in a steering EPAS controller). Another reason for the jackknife enabling condition is that trailer curvature control mechanisms generally exhibit reduced steering sensitivity and/or effectiveness when the vehicle 14 is at relatively high speeds and/or when undergoing relatively high acceleration.
Jackknife determining information may be received by the curvature controller 28, according to one embodiment, to process and characterize a jackknife enabling condition of the vehicle-trailer combination at a particular point in time (e.g., at the point in time when the jackknife determining information was sampled). Examples of the jackknife determining information include, but are not limited to, information characterizing a hitch angle γ, information characterizing a vehicle accelerator pedal transient state, information characterizing a speed of the vehicle 14, information characterizing longitudinal acceleration of the vehicle 14, information characterizing a brake torque being applied by a brake system of the vehicle 14, information characterizing a powertrain torque being applied to driven wheels of the vehicle 14, and information characterizing the magnitude and rate of driver requested trailer curvature. In this regard, jackknife determining information would be continually monitored such as, for example, by an electronic control unit (ECU) that carries out trailer backup assist (TBA) functionality. After receiving the jackknife determining information, a routine may process the jackknife determining information for determining if the vehicle-trailer combination attained the jackknife enabling condition at the particular point in time. The objective of the operation for assessing the jackknife determining information is determining if a jackknife enabling condition has been attained at the point in time defined by the jackknife determining information. If it is determined that a jackknife enabling condition is present at the particular point in time, a routine may also determine an applicable countermeasure or countermeasures to implement. Accordingly, in some embodiments, an applicable countermeasure will be selected dependent upon a parameter identified as being a key influencer of the jackknife enabling condition. However, in other embodiments, an applicable countermeasure will be selected as being most able to readily alleviate the jackknife enabling condition. In still other embodiment, a predefined countermeasure or predefined set of countermeasures may be the applicable countermeasure(s).
The objective of a countermeasure in the context of the disclosed subject matter (i.e., a jackknife reduction countermeasure) is to alleviate a jackknife enabling condition. To this end, such a countermeasure can be configured to alleviate the jackknife enabling condition using a variety of different strategies. In a vehicle speed sensitive countermeasure strategy, actions taken for alleviating the jackknife enabling condition can include overriding and/or limiting driver requested changes to the radius of curvature of the trailer 12 (e.g., being requested via a steering input apparatus configured in accordance with the disclosed subject matter) as a function of vehicle speed (e.g., via a lookup table correlating radius of curvature limits to vehicle speed). In a countermeasure strategy where trailer curvature requests are limited as a function of speed and driver curvature command transient rates, actions taken for alleviating the jackknife enabling condition can include rate limiting trailer curvature command transients as requested by a driver above a predefined vehicle speed whereas, under the predefined vehicle speed, the as-requested trailer curvature are not rate limited. In a torque limiting countermeasure strategy, actions taken for alleviating the jackknife enabling condition can include application of full available powertrain torque being inhibited when the jackknife enabling condition is present while the vehicle 14 is above a predefined speed and application of full available powertrain torque being allowed when the vehicle speed is reduced below the predefined speed while in the torque inhibiting mode. As opposed to a fixed predefined speed, the torque limiting countermeasure strategy can utilize a speed threshold that is a function of hitch angle γ (i.e., speed threshold inversely proportional to hitch angle acuteness). In a driver accelerator pedal transient detection countermeasure strategy, actions taken for alleviating the jackknife enabling condition can include overriding and/or limiting driver requested trailer radius of curvature as a function of transient accelerator pedal requests (e.g., requested trailer radius of curvature limited when a large accelerator pedal transient is detected). In a hitch angle rate sensitive countermeasure strategy, actions taken for alleviating the jackknife enabling condition can include using hitch angle rate in a predefined or calculated mapping with current hitch angle position to limit driver requested trailer radius of curvature. Accordingly, in view of the disclosures made herein, a skilled person will appreciate that embodiments of the disclosed subject matter are not unnecessarily limited to a countermeasure strategy of any particular configuration.
As previously disclosed with reference to the illustrated embodiments, during operation of the trailer backup assist system 10, a driver of the vehicle 14 may be limited in the manner in which steering inputs may be made with the steering wheel 68 of the vehicle 14 due to the power assist steering system 62 being directly coupled to the steering wheel 68. Accordingly, the steering input device 18 of the trailer backup assist system 10 may be used for commanding a curvature of a reference path 26 of the trailer 12, thereby decoupling such commands from being made at the steering wheel 68 of the vehicle 14. However, additional embodiments of the trailer backup assist system 10 may have the capability to selectively decouple the steering wheel 68 from movement of steerable wheels of the vehicle 14, thereby allowing the steering wheel 68 to be used for commanding changes in curvature of a path of a trailer 12 during such trailer backup assist.
Referring now to
As also shown in the embodiment of the mode selection device 20 illustrated in
With continued reference to the embodiment of the mode selection device 20 illustrated in
A third button 104 of the mode selection device 20, as illustrated in the embodiment shown in
An additional embodiment of the mode selection device 20 is illustrated in
The rotatable knob 30, as illustrated in
With reference to
Referring again to
After activating the trailer backup assist system 10 (e.g., before, after, or during the pull-thru sequence), the driver begins to back the trailer 12 by reversing the vehicle 14 from the first backup position B1. So long as the rotatable knob 30 of the trailer backup steering input device 18 remains in the at-rest position P(AR) and no other steering input devices 18, such as the mode selection device 20, are activated, the trailer backup assist system 10 will steer the vehicle 14 as necessary for causing the trailer 12 to be backed along a substantially straight path of travel, as defined by the longitudinal direction 22 of the trailer 12, specifically the centerline axis L2 of the trailer 12, at the time when backing of the trailer 12 began. When the trailer 12 reaches the second backup position B2, the driver rotates the rotatable knob 30 to command the trailer 12 to be steered to the right (i.e., a knob position R(R) clockwise rotation). Accordingly, the trailer backup assist system 10 will steer the vehicle 14 for causing the trailer 12 to be steered to the right as a function of an amount of rotation of the rotatable knob 30 with respect to the at-rest position P(AR), a rate movement of the knob, and/or a direction of movement of the knob with respect to the at-rest position P(AR). Similarly, the trailer 12 can be commanded to steer to the left by rotating the rotatable knob 30 to the left. When the trailer 12 reaches backup position B3, the driver allows the rotatable knob 30 to return to the at-rest position P(AR) thereby causing the trailer backup assist system 10 to steer the vehicle 14 as necessary for causing the trailer 12 to be backed along a substantially straight path of travel as defined by the longitudinal centerline axis L2 of the trailer 12 at the time when the rotatable knob 30 was returned to the at-rest position P(AR). Thereafter, the trailer backup assist system 10 steers the vehicle 14 as necessary for causing the trailer 12 to be backed along this substantially straight path to the fourth backup position B4. In this regard, arcuate portions of a path of travel POT of the trailer 12 are dictated by rotation of the rotatable knob 30 and straight portions of the path of travel POT are dictated by an orientation of the centerline longitudinal axis L2 of the trailer 12 when the knob is in/returned to the at-rest position P(AR).
In the embodiment illustrated in
Referring now to
With continued reference to
Still referring to
As shown in
Similarly, if the mode selection device 20 is selected at step 150 to perform the vehicle straight routine 98, the vehicle straight routine 98 is initiated at step 152 according to the embodiment illustrated in
With continued reference to
Still referring to
In parallel with performing the operations for receiving the trailer backup assist requests, determining the desired reference path 26 and curvature of the trailer 12, and generating the vehicle steering commands, the trailer backup assist system 10 may perform an operation for monitoring if an unacceptable trailer backup condition exists. Examples of such monitoring include, but are not limited to assessing a hitch angle γ to determine if a hitch angle γ threshold is exceeded, assessing a backup speed to determine if a backup speed threshold is exceeded, assessing vehicle steering angle to determine if a vehicle steering angle threshold is exceeded, assessing other operating parameters (e.g., vehicle longitudinal acceleration, throttle pedal demand rate and hitch angle rate) for determining if a respective threshold value is exceeded, and the like. Backup speed can be determined from the wheel speed information obtained from one or more wheel speed sensors 58 of the vehicle 14. If it is determined that an unacceptable trailer backup condition exists, an operation may be performed for causing the current path of travel of the trailer 12 to be inhibited (e.g., stopping motion of the vehicle 14), followed by the operation being performed for ending the current trailer backup assist instance. It is disclosed herein that prior to and/or in conjunction with causing the current trailer path to be inhibited, one or more actions (e.g., operations) can be implemented for providing the driver with feedback (e.g., a warning) that such an unacceptable hitch angle condition is impending or approaching. In one example, if such feedback results in the unacceptable hitch angle condition being remedied prior to achieving a critical condition, the method can continue with providing trailer backup assist functionality in accordance with operations. Otherwise, the method can proceed to operation for ending the current trailer backup assistance. In conjunction with performing the operation for ending the current trailer backup assistance, an operation can be performed for controlling movement of the vehicle to correct or limit a jackknife condition (e.g., steering the vehicle, decelerating the vehicle, limiting magnitude and/or rate of driver requested trailer curvature input, limiting magnitude and/or rate of the steering command, and/or the like to preclude the hitch angle from being exceeded).
It will be understood by one having ordinary skill in the art that construction of the described invention and other components is not limited to any specific material. Other exemplary embodiments of the invention disclosed herein may be formed from a wide variety of materials, unless described otherwise herein.
For purposes of this disclosure, the term “coupled” (in all of its forms, couple, coupling, coupled, etc.) generally means the joining of two components (electrical or mechanical) directly or indirectly to one another. Such joining may be stationary in nature or movable in nature. Such joining may be achieved with the two components (electrical or mechanical) and any additional intermediate members being integrally formed as a single unitary body with one another or with the two components. Such joining may be permanent in nature or may be removable or releasable in nature unless otherwise stated.
It is also important to note that the construction and arrangement of the elements of the invention as shown in the exemplary embodiments is illustrative only. Although only a few embodiments of the present innovations have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited. For example, elements shown as integrally formed may be constructed of multiple parts or elements shown as multiple parts may be integrally formed, the operation of the interfaces may be reversed or otherwise varied, the length or width of the structures and/or members or connector or other elements of the system may be varied, the nature or number of adjustment positions provided between the elements may be varied. It should be noted that the elements and/or assemblies of the system may be constructed from any of a wide variety of materials that provide sufficient strength or durability, in any of a wide variety of colors, textures, and combinations. Accordingly, all such modifications are intended to be included within the scope of the present innovations. Other substitutions, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the desired and other exemplary embodiments without departing from the spirit of the present innovations.
It will be understood that any described processes or steps within described processes may be combined with other disclosed processes or steps to form structures within the scope of the present invention. The exemplary structures and processes disclosed herein are for illustrative purposes and are not to be construed as limiting.
It is also to be understood that variations and modifications can be made on the aforementioned structures and methods without departing from the concepts of the present invention, and further it is to be understood that such concepts are intended to be covered by the following claims unless these claims by their language expressly state otherwise.
This patent application is a continuation-in-part of U.S. patent application Ser. No. 14/310,039, which was filed on Jun. 20, 2014, now U.S. Pat. No. 9,511,799, entitled “OBJECT AVOIDANCE FOR A TRAILER BACKUP ASSIST SYSTEM,” which is a continuation-in-part of U.S. patent application No. 13/759,022, filed on Feb. 4, 2013, now U.S. Pat. No. 9,164,955, entitled “TRAILER ACTIVE BACK-UP ASSIST WITH OBJECT AVOIDANCE,” hereby incorporated by reference in their entirety.
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| Number | Date | Country | |
|---|---|---|---|
| 20150367886 A1 | Dec 2015 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 14310039 | Jun 2014 | US |
| Child | 14312021 | US |
