METHOD AND DEVICE FOR DETERMINING THE CHANGE IN THE FOOTPRINT OF A TIRE

• US 20100324858A1
• Filed: 11/26/2008
• Published: 12/23/2010
• Est. Priority Date: 02/06/2008
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Keck, Marian, Pannek, Thorsten
• Application Number:
  US12/735,531
• Publication Number:
  US 20100324858A1
• Time in Patent Office: Days
• US Class Current: 702/141
• CPC Class Codes: B60C 23/0488 Movement sensor, e.g. for sensing angular speed, acceleration or centripetal force
• CPC Class Codes: B60C 23/064 comprising tyre mounted deformation sensors, e.g. to determine road contact area

Abstract

A method for determining a change in the footprint of a tire, on the basis of a signal, which may be assigned to the rotation of the tire, is output by a sensor, and corresponds to an acceleration, the determination being performed by the following: recording at least one acceleration signal g₁, which is able to be assigned to the rotation of the tire; reading out a stored reference acceleration signal g₀, which is able to be assigned to the rotation of the tire; calculating a difference between the acceleration signal g₁ and the reference acceleration signal g₀; and determining the change in the footprint of the tire on the basis of the calculated difference between the acceleration signals.

Claims

1-12. -12. (canceled)

13. A method for determining a change in the footprint of a tire, on the basis of a signal, which can be assigned to the rotation of the tire, and which is output by a sensor and corresponds to an acceleration, the method comprising:

recording at least one signal, which can be assigned to the rotation of the tire, and which corresponds to an acceleration;

reading out a stored signal, which can be assigned to the rotation of the tire, and which corresponds to a reference acceleration;

calculating a difference between the signal which corresponds to the acceleration and the signal which corresponds to the reference acceleration; and

determining the change in the footprint of the tire based on the calculated difference.

14. The method of claim 13, wherein the signal corresponding to the acceleration is converted into a pulse-width-modulated signal with the aid of filtering.

15. The method of claim 13, wherein at least one frequency component is extracted from the signal corresponding to the acceleration with the aid of filtering.

16. The method of claim 13, wherein the signal corresponding to the acceleration is converted into a spectrum with the aid of transformation.

17. The method of claim 13, wherein the spectrum is scaled with reference to acceleration and frequency.

18. The method of claim 13, wherein multiple signals, which can be assigned to the rotation of the tire, and which correspond to the acceleration, are recorded, and a mean value is calculated from the multiple signals.

19. The method of claim 13, wherein a change in the spectrum of the signal, which corresponds to the acceleration, occurs based on a change in the footprint of the tire.

20. The method of claim 13, wherein the curve of the signal corresponding to the acceleration corresponds to the ratio of the footprint of the tire to the circumference of the tire.

21. The method of claim 13, wherein the signal which corresponds to the acceleration is stored as a signal which corresponds to the reference acceleration.

26. The computer readable medium of claim 13, wherein the signal corresponding to the acceleration is converted into a spectrum with the aid of transformation.

27. The computer readable medium of claim 13, wherein the spectrum is scaled with reference to acceleration and frequency.

28. The computer readable medium of claim 13, wherein multiple signals, which can be assigned to the rotation of the tire, and which correspond to the acceleration, are recorded, and a mean value is calculated from the multiple signals.

29. The computer readable medium of claim 13, wherein a change in the spectrum of the signal, which corresponds to the acceleration, occurs based on a change in the footprint of the tire.

30. The computer readable medium of claim 13, wherein the curve of the signal corresponding to the acceleration corresponds to the ratio of the footprint of the tire to the circumference of the tire.

31. The computer readable medium of claim 13, wherein the signal which corresponds to the acceleration is stored as a signal which corresponds to the reference acceleration.

22. A device for determining a change in the footprint of a tire, set up to determine a change in the footprint of a tire based on a signal, which can be assigned to the rotation of the tire, and which is output by a sensor and corresponds to an acceleration, comprising:

a recording arrangement to record at least one signal, which can be assigned to the rotation of the tire, and which corresponds to an acceleration;

a reading arrangement to read out a stored signal, which can be assigned to the rotation of the tire, and which corresponds to a reference acceleration;

a calculating arrangement to calculate a difference between the signal which corresponds to the acceleration and the signal which corresponds to the reference acceleration; and

a determining arrangement to determine the change in the footprint of the tire based on the calculated difference.

23. A computer readable medium having a computer program which is executable by a processor, comprising:

a program code arrangement having program code for determining a change in the footprint of a tire, on the basis of a signal, which can be assigned to the rotation of the tire, and which is output by a sensor and corresponds to an acceleration, by performing the following;

recording at least one signal, which can be assigned to the rotation of the tire, and which corresponds to an acceleration;

reading out a stored signal, which can be assigned to the rotation of the tire, and which corresponds to a reference acceleration;

calculating a difference between the signal which corresponds to the acceleration and the signal which corresponds to the reference acceleration; and

determining the change in the footprint of the tire based on the calculated difference.

24. The computer readable medium of claim 23, wherein the signal corresponding to the acceleration is converted into a pulse-width-modulated signal with the aid of filtering.

25. The computer readable medium of claim 23, wherein at least one frequency component is extracted from the signal corresponding to the acceleration with the aid of filtering.