Wheel sensor for detecting a vehicle motion

• US 20060161327A1
• Filed: 01/11/2006
• Published: 07/20/2006
• Est. Priority Date: 01/18/2005
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Emmerich, Harald, Klose, Hans-Peter
• Application Number:
  US11/330,736
• Publication Number:
  US 20060161327A1
• Time in Patent Office: Days
• US Class Current: 701/78
• 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 23/0488 Movement sensor, e.g. for sensing angular speed, acceleration or centripetal force
• CPC Class Codes: G01P 3/22 transferred to the indicator by electric or magnetic means
• CPC Class Codes: G01P 3/44 for measuring angular speed G01P3/56 takes precedence

Abstract

A device for measuring a motion of a vehicle includes an acceleration sensor situated on a wheel and an appertaining evaluation circuit. The sensor system operates especially accurately and reliably if the acceleration sensor is mounted on the wheel in such a way that the main sensing direction lies essentially in the tangential direction of the wheel.

Claims

1. A device for detecting a state of motion of a vehicle, comprising:

an appertaining evaluation circuit; and

an acceleration sensor mounted on a wheel of the vehicle in such a way that a main sensing direction is substantially in a tangential direction.

2. The device according to claim 1, wherein the evaluation circuit calculates a difference between two acceleration values and evaluates the difference, so as to establish a vehicle motion.

3. The device according to claim 2, wherein the evaluation circuit generates an output signal for activating a wheel pressure monitoring system if the difference is greater than a predefined threshold value.

4. The device according to claim 2, wherein the evaluation circuit switches over into a second, more accurate measuring mode if the difference satisfies a predefined condition.

5. The device according to claim 4, wherein the evaluation circuit in the second measuring mode evaluates measured values that lie closer together in time.

6. The device according to claim 4, wherein the evaluation circuit in the second measuring mode carries out a zero crossing detection.

7. The device according to claim 1, wherein the evaluation circuit scans an output signal of the acceleration sensor at an irregular scanning frequency.

8. The device according to claim 1, wherein the acceleration sensor is mounted with the main sensing direction deviating from the tangential direction.

9. The device according to claim 8, wherein the evaluation circuit detects a vehicle motion if an absolute value of a sensor signal exceeds a predefined threshold value.

10. A motor vehicle wheel comprising:

an appertaining evaluation circuit; and

an acceleration sensor mounted on the wheel in such a way that a main sensing direction lies substantially in a tangential direction of the wheel.