Apparatus and method for detecting a tire deformation of a vehicle tire

• US 7,121,138 B2
• Filed: 09/02/2004
• Issued: 10/17/2006
• Est. Priority Date: 09/02/2003
• Status: Active Grant

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: Hammerschmidt, Dirk
• Primary Examiner(s): Lefkowitz, Edward
• Assistant Examiner(s): Bonanto, George P.
• Application Number:
  US10/932,526
• Publication Number:
  US 20050044945A1
• Time in Patent Office: 775 Days
• Field of Search: 731/46, 731/463
• US Class Current: 73/146.3
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
• CPC Class Codes: B60C 23/0477 Evaluating waveform of pressure readings

Abstract

An apparatus for detecting a tire deformation of a vehicle tire includes a tire pressure sensor for sensing a tire pressure, a signal processor configured to provide a signal indicating the tire deformation based on a difference between the tire pressure at a first time and the tire pressure at a second time. What is achieved thereby is that a tire deformation may efficiently be sensed.

Claims

1. An apparatus for detecting a tire deformation of a vehicle tire, comprising:

a tire pressure sensor for sensing a tire pressure;

a signal processor configured to provide a signal indicating the tire deformation based on a difference between the tire pressure at a first time and the tire pressure at a second time,

wherein the signal processor comprises

a unit for determining a tire pressure average value and for providing a value based on the tire pressure average value;

a unit for sensing a difference between the value and a further value, wherein the further value is based on the tire pressure at the second time; and

a unit for providing the signal indicating tire deformation on the basis of the difference,

wherein the tire pressure at the second time is larger than the tire pressure average value at the first time due to a tire deformation, and

wherein the unit for providing the signal indicating the tire deformation is configured to provide the signal indicating the tire deformation at the second time, if the difference between the value and the further value exceeds a predetermined value.

2. The apparatus of claim 1, wherein the unit for determining the tire pressure average value is further configured to determine a value based on a tire pressure average value at the second time as the further value.

3. The apparatus of claim 1, further comprising a unit for providing state information, wherein the state information indicates a parking state of the vehicle, wherein the signal processor is configured to provide the signal indicating tire deformation depending on the state information.

4. The apparatus of claim 3, wherein the state information includes information about a first state and information about a second state of the vehicle.

5. The apparatus of claim 3, wherein the state information includes information about a change in state.

6. The apparatus of claim 3, wherein the tire pressure sensor is configured to determine a plurality of tire pressure measuring values within a first time interval in the first state, and to determine a second plurality of tire pressure measuring values within a second time interval in the second state, wherein the first plurality of tire pressure measuring values is larger than the second plurality of tire pressure measuring values.

7. The apparatus of claim 1, wherein the unit for determining further comprises a low-pass filter to determine the tire pressure average value by low-pass filtering, wherein the unit for determining is configured to provide the tire pressure average value as the further value.

8. The apparatus of claim 1, wherein the value based on the tire pressure average value is a square of the tire pressure average value.

9. The apparatus of claim 1, wherein the tire pressure sensor is configured to change a tire pressure measuring rate depending on the time.

10. The apparatus of claim 3, wherein the tire pressure sensor is configured to change a tire pressure measuring rate depending on the state.

11. A method for detecting a tire deformation of a vehicle tire, comprising:

sensing a tire pressure;

providing a signal indicating the tire deformation based on a difference between the tire pressure at a first time and the tire pressure at a second time,

wherein providing the signal indicating the tire deformation comprises

determining a tire pressure average value and providing a value based on the tire pressure average value;

sensing a difference between the value and a further value, wherein the further value is based on the tire pressure at the second time; and

providing the signal indicating tire deformation on the basis of the difference,

wherein the tire pressure at the second time is larger than the tire pressure average value at the first time due to a tire deformation, and

providing the signal indicating the tire deformation comprises providing the signal indicating the tire deformation at the second time, if the difference between the value and the further value exceeds a predetermined value.

12. The method of claim 11, comprising a step of detecting a parking state.

13. The method of claim 11, including a step of detecting a change in state.

14. A computer readable storage medium having a computer readable program code, said program code when executed on a computer carrying out a method for detecting a tire deformation of a vehicle tire, said method comprising the steps of:

sensing a tire pressure;

providing a signal indicating the tire deformation based on a difference between the tire pressure at a first time and the tire pressure at a second time,

wherein providing the signal indicating the tire deformation comprises

determining a tire pressure average value and providing a value based on the tire pressure average value;

sensing a difference between the value and a further value, wherein the further value is based on the tire pressure at the second time; and

providing the signal indicating tire deformation on the basis of the difference,

wherein the tire pressure at the second time is larger than the tire pressure average value at the first time due to a tire deformation, and

providing the signal indicating the tire deformation comprises providing the signal indicating the tire deformation at the second time, if the difference between the value and the further value exceeds a predetermined value.