FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. TITLE OF THE INVENTION
"ONBOARD WHEEL ALIGNMENT SYSTEM AND METHOD OF CONSTRUCTION
THEREOF"
2. APPLICANT
VE COMMERCIAL VEHICLES LTD., An Indian National having its place of business at 102, INDUSTRIAL AREA NO.1, PITHAMPUR-454775, DIST. DHAR, MADHYA PRADESH, INDIA
3. PREAMBLE OF THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed

TECHNICAL FIELD
[001] The present subject matter relates to an onboard automatic wheel alignment monitoring and displaying system and method of construction thereof.
BACKGROUND
[002] In the automobile industry, proper alignment of wheel(s) is necessary to maintain the balance of the vehicle and also enhance the life of the tire. As you may aware that the tire/tyre is crucial component to decide the price of the vehicle. Therefore, if the life of the tyre is short or minimal, due to misalignment of the tyre may exponentially increase the financial burden on owner.
[003] It is appear to be a major drawback in the automobile industries, as the misalignment of tire is one of the major reason for tire wear. Even a small amount of misalignment can lead to damage of tire. When wheels are misaligned, tires wear out unevenly relative to each other and within each tire's own tread. The tires may also show a rough and wavering appearance. Therefore user must need to pay regular and proper attention to the tyre or wheel alignment and if user is not a trained and skilled person, he or she would not able to understand the alignment condition of the wheel resultant tire wear increases day by day. User may able to know about misalignment, when user go to workshop for maintenance service and most of the time customer would not prefer to check misalignment; as user has to pay extra cost for checking the wheel alignment condition. At last, when customer identify misalignment issue of the wheel resultant decrease the life of tire.
[004] Hence the proper and regular checking of alignment condition of the wheel is important and also there is a need of onboard wheel alignment system to check the alignment condition of the wheel during the running condition of the vehicle.
[005] Therefore, there is an unmet need of onboard wheel alignment system on real-time basis to measure the toe-in and toe-out value in the vehicle static and running condition of the vehicle but also provide online information and update to

the driver. It measure(s) wheel alignment and alert customer; so that alignment of the wheel or tires can be done before tire wear takes place.
SUMMARY OF THE SUBJECT MATTER
[006] The existing wheel alignment system is an image based system considered to be a complex system, wherein a camera takes an image of the wheel and the assembly. Then image processed in a system that will further, measure wheel alignment values. In this kind of system, a complex control system and setup is required that will further, require a skilled operator to operate/to know the status of the alignment of the wheel.
[007] The present subject solve the aforementioned and other problems by providing an onboard wheel alignment sensing system and method of construction thereof. The system monitor alignment of the wheel of the vehicle and display the alignment value of the wheel to the driver, so that timely and regularly alignment of the wheel can be done. Hence it not only increase the life of tire or wheel but also reduce cost and time for repetitive wheel alignment process offline.
[008] The present subject matter discloses an on-board wheel alignment monitoring and displaying system. The on-board wheel alignment monitoring and displaying system comprises at least one rotary sensor; atleast one electronic controller unit; atleast one mounting plate; atleast one dowel; atleast one bush; atleast one display unit and a combination thereof. The on-board wheel alignment monitoring and displaying system of present subject matter measure the toe-in and toe-out value of vehicle in stationary or running condition on a real-time basis. Further,, the rotary sensor is characterized by mounting and positioning of the rotary sensor in such a way that to measure the angle deviation (> 2 mm) between king-pin and stub angle. The rotary sensor configured to engage with the dowel through the bush to measure the angle between king-pin and stub angle and mounted on the mounting plate. The electronic controller unit receive and transmit signals between rotary sensor and display unit to reproduce in readable format. The mounting plate mounting rotary sensor on it. Further,, the dowel is mounted on the king-pin and configured to engage with rotary sensor through the bush. The bush is mounted

between dowel and rotary sensor to allow rotation between dowel and mounting plate to assist in measuring the sensor value of rotary sensor. The display unit comprising a computer programming to convert the angle value of rotary sensor into lineardistance value and display on'the screen of display unit.
[009] In one embodiment, the present subject matter discloses an onboard wheel condition monitoring system, that monitor alignment of wheel of the vehicle and display the alignment value of the wheel to the driver, so that timely and regularly alignment of the wheel can be done. Hence it not only increase the life of tire or wheel but also reduce cost and time for repetitive wheel alignment process offline.
[0010] In another embodiment, the present subject matter relates to on-
board wheel alignment measuring system to measure the toe-in and toe-out that helps to determine misalignment of wheel thus reduces tire wear. The system of present subject matter comprising a sensor, a mounting plate, a bush, dowel and a display etc.
[0011] In one embodiment, the present subject matter discloses an on-
board wheel alignment sensing system. The sensor of the system is a compact rotary sensor that is mounted on mechanical parts attached to king-pin. The sensor measures a small amount of angle and mathematical model to convert this angle into linear distance.
[0012] . In another embodiment, the present subject matter relates to a
wheel alignment sensing system to measure toe-in and toe-out value; still while vehicle is in running/stationary mode. Thereby decrease tire wear and increase life of tire, by using display for wheel alignment. It also reduces the cost and time of the wheel alignment.
[0013] The location of sensor mounting and positioning to measure the
toe-in and toe-out makes the present system different from conventional/existing system. The king-pin of present subject matter is covered by a plate for safety against dust and other things. In wheel alignment system this safety plate is replaced by the wheel alignment system that not only measures the alignment with the help of angle measurement but also provides safety as conventional plate

[0014] The wheel alignment system having a base plate comprising
several holes for easy mounting of this system with stub axle of the front axle assembly of the vehicle.
[0015] In another embodiment, the present subject matter discloses the
working principle of the present system by following steps:
[0016] The present subject matter discloses an operation of the present
system; wherein the system is configured to be engaged with stub ax\e and king-pin with help of dowel and mounting plate. A rotary sensor is mounted on plate to measure angle between dowel and plate. Dowel and plate are connected by a bush that helps in rotation of dowel and plate when stub axle and king-pin rotated.
[0017] In one embodiment, the present subject matter eliminates the
need of skills of a technician in identifying the alignment of the wheel. In onboard sensor based diagnostics of wheel alignment in tyre of the vehicles. In the process, the technician uses a rotary sensor that measures angle between stub axle and king-pin. The output of the angle sensor is shown in display unit with the help of control unit that shows toe in/out values of the vehicle.
[0018] It is to be understood that other embodiments of the present
disclosure will become readily apparent to those skilled in the art from the following detailed description, wherein it is shown and described only various embodiments of the disclosure by way of illustration. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
BRIEF DESCRIPTION OF DRAWINGS
[0019] Aspects of the present disclosure are illustrated by way of
example(s), and not by way of limitation, in the accompanying drawings, wherein:
[0020] FIG. 1 is an illustration of components of an onboard wheel
alignment sensing system.
[0021] FIG. 2 is an illustration of working principle of the onboard onboard
wheel alignment sensing system in accordance with one embodiment of the present disclosure.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
[0022] The present disclosure relates generally to an on-board wheel
alignment sensing system and method for diagnostics and monitoring the alignment of wheel during movement of the vehicle.
[0023] Referring to FIG. 1 illustrated an on-board automated wheel
alignment system 100 in accordance with one embodiment of the present disclosure. The system comprising a rotary sensor; a mounting plate; a dowel, a bush and a display unit and a combination thereof.
[0024] In one embodiment, the present subject matter discloses an
on-board wheel alignment monitoring and displaying system. The on-board wheel alignment monitoring and displaying system comprises at least one rotary sensor; atleast one electronic controller unit; atleast one mounting plate; atleast one dowel; atleast one bush; atleast one display unit and a combination thereof. The on-board wheel alignment monitoring and displaying system of present subject matter measure the toe-in and toe-out value of vehicle in stationary or running condition on a real-time basis. Further, the rotary sensor is characterized by mounting and positioning of the rotary sensor in such a way that to measure the angle deviation (> 2 mm) between king-pin and stub angle. The rotary sensor configured to engage with the dowel through the bush to measure the angle between king-pin and stub angle and mounted on the mounting plate. The electronic controller unit receives and transmits signals between rotary sensor and display unit to reproduce in the readable format. The rotary sensor mounted on mounting plate. Further, the dowel is mounted on the king-pin and configured to engage with rotary sensor through the bush. The bush is mounted between dowel and rotary sensor to allow rotation between dowel and mounting plate to assist in measuring the sensor value of rotary sensor. The display unit comprising a computer programming to convert the angle value of rotary sensor into linear distance value and display on the screen of display unit.
[0025] In another embodiment, the rotary sensor is configure to engage
with dowel through the bush to measure angle between king-pin and stub angle.

Further, the mounting plate is mounted on the place of king-pin on stub axle. The dowel is mounted on the king-pin and configured to be engaged rotatory sensor through the bush. The dowel is a stationary position due to the stationary nature of the king-pin. Further,, the rotatory sensor is mounted on the stub axle through the plater and due to rotary nature of the stub axle, the rotatory sensor is also rotatory in nature. Further, the bush is mounted between dowel and sensor shaft, It allows rotation between dowel and mounting plate that will help to measure sensor.
[0026] In one illustrations, in heavy duty vehicle, normal wheel alignment
system about 2 millimeter deviation of the wheel during the toe-in and toe-out process is permissible. Above the 2 mm deviation would be considered as the misalignment of the wheels. The rotary sensor is to measure angle between king-pin and stub angle. The mounting plate is mounted in the place of king-pin plate on stub axle and the sensor is mounted over it. The dowel is mounted in king-pin and it is stationary during all the working of system. The bush is mounted between dowel and sensor shaft, It allows rotation between dowel and mounting plate that will help to measure sensor.
[0027] The wheel alignment sensing system of the present subject matter
is a system to measure toe in and toe out value, while vehicle is running/stationary. It will decrease tire wear and increase life of tire, by using display for wheel alignment. This may reduce cost and time of wheel alignment system.
[0028] FIG. 2 illustrated the working principle of the on-board diagnostic
system as illustrated in FIG. 1. The working principle discloses by following steps: the system start working, the moment, the driver put ignition on. Initially, the driver/user has to put steering in zero condition to measure toe. Further, inventor(s) has put a proximity sensor that senses motion of pitman arm and confirms its zero position and gives signal to controller. Now rotary sensor that is located on king-pin will measure angle and give signal to electronic control unit. The angle value is sent to controller inform of voltage. The computer programming is utilize to convert this angle value to liner distance and it shows toe value on display screen. The system provides an alert message; if wheel toe values are misaligned.

[0029] In another embodiment, the operation of the system is illustrated,
wherein the system start working, as we put ignition on. First of all, we have to put steering in zero condition since to measure toe, steering should be at zero. We have put a proximity sensor that senses motion of pitman arm and conforms its zero position and gives signal to controller. Now rotary sensor that is located on king-pin will measure angle and give signal to electronic control unit.
[0030] The angle value is sent to controller in form of voltage. Computer
programming is done to convert this angle value to liner distance and it shows Toe value in display screen. It will show alert message if wheel toe values are misaligned.
[0031] The system of present subject matter comprises an angle sensor
accuracy system to measure very small angle. It should measure angle value up to 0.05deg. The system is mounted on the front axle of the wheel of the vehicle.
[0032] There are three major mechanical part - in which one is stationary
one is rotating and another is a bush that joins rotary and stationary part. All these parts must be align in such a way that a small movement can be sensed and measurement can be done. Also we have to make sure so constraint should be there for rotation of sensor mounting plate. If the axis of all the parts will not align than the plate will lock and rotation will not happen thus no measurement can be done by the sensor.
[0033] In another embodiment, above illustration clearly indicate the
arrangement of system on the vehicle and function of the system. The system is assembled on vehicle (on which toe-in was disturbed knowingly for testing purpose) and wheel alignment values were taken and it is observed that system has accuracy more than 95%.The sensor is showing value of toe after conversion of angular measurement into the linear distance. In general for a unload truck 2mm is the limit for toe exceeding this limit creates tire wear. The sensor of present system measures the linear value for both the tire and shows the result on the display screen.
[0034] In another embodiment, the present subject matter demonstrated
the advantage of the present subject matter is to measure the minor misalignment of the wheel and its adverse effect on the vehicle. A1 mm misalignment leads to 7%

loss of tyre life. Further, on-board measurement of the wheel alignment assist driver to know misalignment of wheels in vehicle.
[0035] In another embodiment, a non-contact sensor may integrated in
the present system for better measurement and also make the system automatic, thereby the system can align the wheels automatically.
[0036] It would become abundantly clear to a person in the art, after
reading this specification that the present subject matter also provides an onboard wheel alignment sensing system and method thereof. More specifically, the present subject matter identify and display the misalignment of wheel of the vehicle during running condition automatically, without the assistance or intervention of a tool or a technician and without departing from the spirit of the present subject matter. While the subject matter may be susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and have been described herein. Alternate embodiments or modifications may be practiced without departing from the spirit of the present subject matter. The drawings shown are schematic drawings and may not be to the scale. While the drawings show some features of the subject matter, some features may be omitted. Alternatively, in some other cases some features may be emphasized while others are not. Further,, the methods disclosed herein may be performed in manner and/or order in which the methods are explained. Alternatively, the methods may be performed in manner or order different than what is explained without departing from the spirit of the present subject matter. It should be understood that the subject matter is not intended to be limited to the particular forms disclosed. Rather, the subject matter is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the subject matter.

We claim:
1. An on-board wheel alignment monitoring and displaying system comprising at least one rotary sensor; atleast one electronic controller unit; atleast one mounting plate; atleast one dowel; atleast one bush; atleast one display unit and a combination thereof.
2. The on-board wheel alignment monitoring and displaying system as claimed in claim 1, wherein said on-board wheel alignment monitoring and displaying system measure the toe-in and toe-outvalue of vehicle in stationary or running condition.
3. The rotary sensor as claimed in claim 1, wherein said rotary sensor is characterized by mounting and positioning of said rotary sensor in such a way, to measure the angle deviation (> 2 mm) between king-pin and stub angle.
4. The rotary sensor as claimed in claim 1, wherein said rotary sensor configure to engage with the dowel through the bush to measure the angle between king-pin and stub angle and mounted on the mounting plate.
5. The electronic controller unit as claimed in claim 1, wherein said electronic controller unit receives and transmits signals between rotary sensor and display unit.
6. The dowel as claimed in claim 1, wherein said dowel is mounted on the king-pin and configure to engage with rotary sensor through the bush.
7. The bush as claimed in claim 1, wherein said bush is mounted between dowel and rotary sensor to allow rotation between dowel and mounting plate to assist in measuring the sensor value of rotary sensor.
8. The display unit as claimed in claim 1, wherein said display unit comprising a computer programming to convert the angle value of rotary sensor into linear distance value and displayed on the screen of display unit.