Patent Application
20240140152
The invention relates to the field of towing, and more specifically to systems for determining trailer tongue weight.
When hitching a trailer to a vehicle, it is important that the weight of the trailer tongue be within the proper range. If too much weight is pressing down on the vehicle's towing ball, it can cause the rear of the vehicle to drop down and the front of the vehicle to raise up. Naturally, this is an unsafe condition, as the front wheels may lose traction and steering may be affected. On the other hand, if the trailer tongue is too light or even pulling the trailer ball upward, that can cause other safety problems for the towing vehicle. The common rule of thumb is about 10-15% of the total trailer weight.
While systems exist for measuring the tongue weight of a trailer, they are typically complicated and inconvenient. See, for example, U.S. Pat. No. 10,596,869, entitled “Ball Assembly for Measuring Tongue Weight of a Trailer;” and U.S. Pat. No. 7,960,659, entitled “Trailer Tongue Weight Measurement System.” What is needed is a more efficient method of determining optimal trailer tongue weight.
In a first aspect, the disclosure provides a system for measuring the tongue weight of a trailer attached to a hitching component of a vehicle. The system includes a smart device comprising a sensor for determining the angle of the smart device with respect to horizontal and an app running on the smart device. The app is configured to take a signal from the sensor when the smart device is resting on a surface of the vehicle at a point in time when the trailer is not hitched to the vehicle and store a value “Angle Unhitched,” corresponding to the angle of the vehicle without the trailer hitched. The app is also configured to take a signal from the sensor when the smart device is resting on the surface of the vehicle at a point in time when the trailer is hitched to the vehicle and store a value “Angle Hitched,” corresponding to the angle of the vehicle without the trailer hitch attached. The app is further configured to obtain a value “VSC,” corresponding to stiffness of suspension for the vehicle, and reflecting a change in angle per unit of weight applied to the hitching component. The app is configured to then calculate a value “TW,” representing the tongue weight of the trailer when hitched to the vehicle, by using the formula:
TW=[(a sin(Angle Unhitched)−a sin(Angle Hitched)]×VSC
where a sin is the arcsine in degrees
The app is also configured to report the value TW to a user of the smart device.
In a second aspect, the disclosure provides a method for measuring the tongue
weight of a trailer attached to a hitching component of a vehicle.
Further aspects and embodiments are provided in the foregoing drawings, detailed description and claims. In one embodiment of the invention, a system for measuring the tongue weight of a trailer attached to a hitching component of a vehicle comprising a smart device may include a sensor for determining the angle of the smart device with respect to horizontal.
It may also include an app running on the smart device, the app configured to take a signal from the sensor when the smart device is resting on a surface of the vehicle at a point in time when the trailer is not hitched to the vehicle and store a value “Angle Unhitched,” corresponding to the angle of the vehicle without the trailer hitched. It may also take a signal from the sensor when the smart device is resting on the surface of the vehicle at a point in time when the trailer is hitched to the vehicle and store a value “Angle Hitched,” corresponding to the angle of the vehicle without the trailer hitch attached. Additionally, the app may obtain a value “VSC,” corresponding to stiffness of suspension for the vehicle, and reflecting a change in angle per unit of weight applied to the hitching component of the vehicle. The app may calculate a value “TW,” representing the tongue weight of the trailer when hitched to the vehicle, by using the formula: TW=[(a sin(Angle Unhitched)−a sin(Angle Hitched)]×VSC, where a sin is the arcsine; and report the value TW to a user of the smart device.
In another embodiment of the invention, the system may comprise an app configured to receive an input representing GVW of the trailer and calculate whether the calculated value for TW is within an acceptable percentage of the GVW of the trailer and report to the user whether the TW is within or not within of the acceptable percentage of the GVW of the trailer. For example, an acceptable percentage may be between 10 and 15 percent of the GVW of the trailer.
In another embodiment of the invention the system may use the app to provide instructions to the user when the TW is not within the acceptable percentage of the GVW of the trailer. In an additional embodiment the app receiving the input representing GVW of the trailer may be accomplished by scanning a sticker on the trailer and adding weights for items loaded on the trailer. Also, adding weights for items loaded on the trailer may be facilitated by selecting items from a menu of possible items on the app.
The system value VSC may be obtained by inputting the VIN into the app, whereupon the app obtains the VSC from a lookup table based on the VIN. The VSC may also be obtained from a sticker comprising a table of values mounted on the vehicle.
In yet another embodiment, the system may provide an app configured to receive an input representing GVW of the trailer, then calculate whether the calculated value for TW is within an acceptable percentage of the GVW of the trailer. The app may report to the user whether the TW is within or not within the acceptable percentage of the GVW of the trailer; receive an input representing the GVWR of the vehicle; receive an input representing the GVW of the vehicle; add the GVW of the vehicle and the GVW of the trailer to obtain a combined GVW; compare the combined GVW to the GVWR; and report to the user whether the combined GVW is greater or less than the GVWR.
Additionally, the system may provide an app adapted to receive an input representing the GVWR of the vehicle and the app also adapted to receive an input representing the GVW of the vehicle. These values may be stored within the app or may be obtained by scanning a sticker on the vehicle and adding weights for items loaded in or on the vehicle.
The app may be optimized by adding predetermined weights for items loaded in or on the vehicle and by selecting items from a menu of possible items on the app.
In the event that the app determines that there is a TW overload or other mismatch, the app may be further configured to provide instructions to the user when the TW is not within the acceptable percentage and provide instructions to the user when the combined GVW is greater than the GVWR.
The system may be further configured, and the app may be further configured to provide instructions to the user on scanning the sticker on the vehicle and scanning the sticker on the trailer. The instructions may include suggestions to the user on equipment to purchase when the TW is not within the acceptable percentage. The instructions may also include suggestions on which equipment may be removed and the order of removal in order to bring the TW into an acceptable percentage.
The system may include an inventory on the app of the equipment that may be purchased from or otherwise provided by a company. Also, the app may be configured to allow the user to purchase the equipment from the company or another vendor according to the system's preferred availability.
Additional methods incorporating the embodiments of the present invention may include any of the following modifications and optimizations that are further described in the drawings. For example, a method for measuring the tongue weight of a trailer attached to a hitching component of a vehicle may comprise providing a smart device comprising a sensor for determining the angle of the smart device with respect to horizontal. Providing the smart device with an app adapted to run on the device and configured to complete the following steps: taking a signal from the sensor when the smart device is resting on a surface of the vehicle at a point in time when the trailer is not hitched to the vehicle and store a value “Angle Unhitched,” corresponding to the angle of the vehicle without the trailer hitched;
The following drawings are provided to illustrate certain embodiments described herein. The drawings are merely illustrative and are not intended to limit the scope of claimed inventions and are not intended to show every potential feature or embodiment of the claimed inventions. The drawings are not necessarily drawn to scale; in some instances, certain elements of the drawing may be enlarged with respect to other elements of the drawing for purposes of illustration.
The following description recites various aspects and embodiments of the inventions disclosed herein. No particular embodiment is intended to define the scope of the invention. Rather, the embodiments provide non-limiting examples of various compositions, and methods that are included within the scope of the claimed inventions. The description is to be read from the perspective of one of ordinary skill in the art. Therefore, information that is well known to the ordinarily skilled artisan is not necessarily included.
The following terms and phrases have the meanings indicated below, unless otherwise provided herein. This disclosure may employ other terms and phrases not expressly defined herein. Such other terms and phrases shall have the meanings that they would possess within the context of this disclosure to those of ordinary skill in the art. In some instances, a term or phrase may be defined in the singular or plural. In such instances, it is understood that any term in the singular may include its plural counterpart and vice versa, unless expressly indicated to the contrary.
As used herein, the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. For example, reference to “a substituent” encompasses a single substituent as well as two or more substituents, and the like.
As used herein, “for example,” “for instance,” “such as,” or “including” are meant to introduce examples that further clarify more general subject matter. Unless otherwise expressly indicated, such examples are provided only as an aid for understanding embodiments illustrated in the present disclosure and are not meant to be limiting in any fashion. Nor do these phrases indicate any kind of preference for the disclosed embodiment.
As used herein, “smart device” is meant to refer to a cellular phone, tablet or similar device that includes an accelerometer or other means for sensing the angle of the device with respect to the horizontal.
As used herein, “app” refers to an application or piece of software, which is programmed to carry out the functions described.
As used herein, “VIN” refers to the Vehicle Identification Number for the vehicle.
As used herein, “GVW” is the Gross Vehicle Weight, i.e. the weight of the vehicle, either the towing vehicle or the trailer, at a point in time.
As used herein, “GVWR” is the Gross Vehicle Weight Rating, i.e. the maximum weight capacity of a vehicle. When referring to a trailer, the GVWR includes the weight of the trailer, along with any items loaded on it.
As used herein, “Towing Capacity” is the maximum weight of a trailer that a
vehicle can tow.
As used herein, “hitching component” refers to the component attached to the towing vehicle on which the trailer tongue rests when towing. For example, a trailer hitch ball is commonly attached to the back of a truck or car. Also, a pin or king pin is used for towing a “5th wheel” type trailer by a pickup truck.
In its preferred embodiment, the invention utilizes sensors inside the phone to calculate many measurements important to safely towing a trailer. These include tongue weight, pin weight, payload, and Weight Distribution. Accelerometers are used in this embodiment, although magnetometers and gyro's may also be used together with accelerometers or alone to calculate the vehicles pitch angle. The invention also helps the customer determine trailer and vehicle weight to give context to the other measurements, to help the customer make better decisions.
In carrying out the method of the invention, the user is instructed to lay the phone down on the floor mat, oriented longitudinally with the vehicle. The accelerometer that lies along the longitudinal axis of the vehicle is used to sense the tilt, typically the Y accelerometer. It is noted that, in this description, the Y axis is the vertical axis, namely the axis that passes from the bottom to the top of the phone. The X axis passes through the width of the from, from one side to the other. The Z axis passes from the front to the back of the phone.
The pitch angle is calculated:
Alpha=a sin(acceleration), where “a sin” is the arcsine in degrees.
The tongue weight may be calculated by sensing the change in pitch when a load is placed on the rear hitch ball.
Tongue Weight=[(a sin(acccelinit)−a sin(accel)]*TW Coeff.
Where:
In addition to tongue weight sensing, the app guides the user through discovering the trailer weight and vehicle weight. Thus, the user is given more context than just a measurement. The trailer weight in particular is needed to determine the optimum tongue weight. The app first helps the customer find the inputs to discover the trailer weight. From the trailer weight, an optimum tongue weight is calculated (generally between 10 and 15%*Trailer weight, most preferably about 12.5%*Trailer weight). When the tongue weight is measured, the app is able to signal and message the user if they are in the correct range. If tongue weight is light, the app instructs the user to move contents from the back of the trailer to the front.
As seen at 51, the app has calculated the tongue weight, based on the Angle Unhitched, the Angle Hitched and the VSC for the vehicle, as described above. That number is reported at 51. Preferably, if the value is within the acceptable range, the number is reported in green and the circle is green. If, on the other hand, and as depicted, the tongue weight value is outside the range, the number is reported in red and the circle 53 is red. Preferably, if the tongue weight is too high, the app also provides the instruction 55 to shift contents from the front of the trailer to the rear, i.e. behind the axle(s) of the trailer.
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The invention has been described with reference to various specific and preferred embodiments and techniques. Nevertheless, it is understood that many variations and modifications may be made while remaining within the spirit and scope of the invention.
This non-provisional application claims priority to the pending U.S. Provisional Application No. 63/381,646, filed Oct. 31, 2022, entitled System and Method for Determining Tongue Weight, the entire contents of which are incorporated herein by this reference.
| Number | Date | Country | |
|---|---|---|---|
| 63381646 | Oct 2022 | US |
