Optical systems and methods for determining tire characteristics

• US 8,087,301 B2
• Filed: 09/24/2007
• Issued: 01/03/2012
• Est. Priority Date: 09/24/2007
• Status: Expired due to Fees

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: Hammerschmidt, Dirk, Loehndorf, Markus, Kvisteroey, Terje
• Primary Examiner(s): Connolly, Patrick J
• Application Number:
  US11/859,816
• Publication Number:
  US 20090080703A1
• Time in Patent Office: 1,562 Days
• Field of Search: 356/601, 356/611, 382/141, 382/152, 382/153, 738/00
• US Class Current: 73/800
• CPC Class Codes: B60C 23/066 by monitoring wheel-centre to ground distance
• CPC Class Codes: G06T 2207/30108 Industrial image inspection
• CPC Class Codes: G06T 7/0004 Industrial image inspection

Abstract

The invention is related to systems and methods for optically measuring conditions and characteristics related to vehicle tires. In one embodiment, a tire monitoring system comprises a grid, a camera, and a processor. The grid can be configured to deform in conjunction with a deformation of the tire. The camera can be mounted optically proximate the grid and configured to acquire an image of the grid. The processor can be in communication with the camera and configured detect the deformation of the tire from the image.

Claims

1. A tire monitoring system comprising:

a grid mounted to a sidewall surface of a tire and configured to deform in conjunction with a deformation of the tire;

a camera mounted optically proximate the grid and configured to acquire an image of the grid; and

a processor in communication with the camera and configured to detect the deformation of the tire from the image.

2. The system of claim 1, wherein the grid comprises a two-dimensional pattern and is coupled to an interior surface of the tire, and wherein the camera is mounted opposite the grid on a rim of the tire.

3. The system of claim 2, wherein the processor is integrated with the camera.

4. The system of claim 1, wherein the image is at least one still image.

5. The system of claim 1, wherein the image is a video image.

6. The system of claim 1, wherein the deformation of the tire comprises a footprint of the tire meeting a driving surface.

7. The system of claim 1, wherein the grid is coupled to an exterior sidewall surface of the tire and the camera is mounted in a wheel housing.

8. The system of claim 7, wherein the grid extends around a sidewall circumference of the tire.

9. The system of claim 7, wherein the grid comprises a solid non-patterned surface.

10. The system of claim 1, wherein the grid further comprises an optically readable tire identifier including information related to the tire.

11. The system of claim 10, wherein the tire identifier comprises a bar code.

12. The system of claim 1, further comprising a light source directed toward the grid.

13. The system of claim 1, further comprising a projector adapted to project the grid onto the sidewall surface of the tire.

14. An optical system comprising:

a patch affixed to a tire;

a optical module adapted to obtain an image of the patch;

a central processing unit communicatively coupled to the camera and at least one vehicle control system, the central processing unit being adapted to determine a status of the tire from the image and information from the at least one vehicle control system; and

a warning system adapted to convey information related to the status of the tire.

15. The system of claim 14, wherein the at least one vehicle control system comprises a vehicle sensor, a wheel sensor, a tire sensor, an accelerometer, a gyroscope, a steering angle sensor, a pressure sensor, a temperature sensor, or a wheel speed sensor.

16. The system of claim 14, wherein the at least one vehicle control system comprises a braking system or a traction system.

17. The system of claim 14, wherein the patch comprises a two-dimensional grid.

18. The system of claim 17, wherein the patch is affixed to an interior tread surface of the tire and the camera is mounted to a rim.

19. The system of claim 17, wherein the patch is affixed to an exterior sidewall surface of the tire and the camera is mounted exterior to the tire.

20. The system of claim 14, wherein the patch extends about a circumference of a sidewall area of a tire.

21. A method of monitoring a tire comprising the steps of:

affixing an image target to an external surface of a tire of a vehicle;

obtaining an image of the image target by a camera mobile with the vehicle;

analyzing the image to determine a characteristic of the tire; and

communicating information related to the characteristic of the tire.

22. The method of claim 21, wherein the step of obtaining an image further comprises obtaining a video image of the image target during motion of the vehicle.

23. The method of claim 21, wherein the step of analyzing the image further comprises comparing the image with known characteristics of the tire.

24. The method of claim 21, wherein the step of communicating further comprises providing at least one of an audible alert and a visual alert.

25. The method of claim 21, further comprising mounting the camera to the vehicle external to the tire.