GOOD CHECKING FOR VEHICLE LATERAL ACCELERATION SENSOR

• US 20110071726A1
• Filed: 08/20/2010
• Published: 03/24/2011
• Est. Priority Date: 08/24/2009
• Status: Active Grant

• Current Assignee: Robert Bosch LLC (Robert Bosch GmbH)
• Original Assignee: Robert Bosch GmbH
• Inventors: Bechtler, Henrik, Bhadange, Ravi, Patil, Nachiket, Stapel, Dietmar, Schwab, Michael, Mallmann, Stefan, Klier, Willy, Tokonaga, Takeshi, Eesmann, Joerg
• Granted Patent: US 8,401,730 B2
• Time in Patent Office: Days
• US Class Current: 701/34
• CPC Class Codes: B60T 2270/406 Test-mode; Self-diagnosis
• CPC Class Codes: B60T 8/3685 characterised by the mounting of the modulator unit onto the vehicle
• CPC Class Codes: B60T 8/885 using electrical circuitry

Abstract

A controller for indicating whether a previously-detected, acceleration-sensor malfunction no longer exists. The controller includes an electronic memory and an electronic processing unit connected to the electronic memory. The electronic processing module includes a malfunction monitoring module, a failure handling module, and a signal checking module. The signal checking module performs a signal check after the malfunction monitoring module generates the fault signal. The signal check includes executing a signal check function with a lateral acceleration signal. Also disclosed is a vehicle including the controller, and a method executed by the controller.

Claims

1. A controller for indicating whether a previously-detected, acceleration-sensor malfunction no longer exists, the controller comprising:

an electronic memory; and

an electronic processing unit connected to the electronic memory, the electronic processing module including,

a malfunction monitoring module configured to monitor the operation of an acceleration sensor and generate a fault signal if the acceleration sensor malfunctions, the fault signal containing fault information and causing at least one of a tell-tale indicator to be activated or a vehicle control module to modify its operation from a first operating state to a second operating state,

a failure handling module configured to cause drive cycle information and the fault information to be stored in the electronic memory, and

a signal checking module configured to perform a signal check after the malfunction monitoring module generates the fault signal, the signal check including

retrieving the drive cycle information from the electronic memory,

determining whether to execute a signal check function based on the drive cycle information,

executing the signal check function with a lateral acceleration signal,

determining whether the lateral acceleration signal passes the signal check function, and

generating a reset signal if the lateral acceleration signal passes the signal check function, the reset signal causing at least one of the tell-tale indicator to be deactivated or the vehicle control module to resume operation in the first operating state.

2. A controller as set forth in claim 1, wherein the malfunction monitoring module monitors the operation of the acceleration sensor by detecting a fault with the lateral acceleration signal and generates the fault signal based on the detection of the fault.

3. A controller as set forth in claim 1, wherein executing the signal check function includes comparing the lateral acceleration signal with a predetermined threshold.

4. A controller as set forth in claim 3, wherein comparing the lateral acceleration signal with the predetermined threshold further includes comparing a lateral acceleration value with the predetermined threshold.

5. A controller as set forth in claim 1, wherein executing the signal check function includes determining a maximum yaw rate value from a measured value from a yaw rate sensor and a modeled value calculated from the acceleration sensor, determining a minimum yaw rate value from the measured value and the modeled value, and comparing the difference of the maximum yaw rate value and the minimum yaw rate value with a predetermined threshold, and wherein the determining whether the lateral acceleration signal passes the signal check function is based on the comparison of the difference of the maximum yaw rate value and the minimum yaw rate value with the predetermined threshold.

6. A controller as set forth in claim 1, wherein the lateral acceleration signal includes an offset value.

7. A controller as set forth in claim 6, wherein executing the signal check function includes comparing the offset value with a predetermined threshold, the predetermined threshold being based on a distance value.

8. A controller as set forth in claim 1, wherein executing the signal check function includes performing a plausibility check with the lateral acceleration signal.

9. A controller as set forth in claim 1, wherein executing the signal check function includes performing a stuck signal check with the lateral acceleration signal.

10. A vehicle including the acceleration sensor connected to the controller of claim 1.

11. A vehicle as set forth in claim 10, wherein the acceleration sensor includes a lateral acceleration sensor generating the lateral acceleration signal.

12. A method executed by a controller, including an electronic processing unit and an electronic memory, for determining whether a previously-detected, acceleration-sensor malfunction no longer exists, the method comprising:

monitoring the operation of an acceleration sensor with a malfunction monitoring module executed by the electronic processing unit;

generating a fault signal containing fault information with the malfunction monitoring module when the acceleration sensor malfunctions;

causing at least one of a tell-tale indicator to be activated or a vehicle control module to modify its operation from a first operating state to a second operating state;

storing drive cycle information and the fault information in the electronic memory with a failure handling module executed by the electronic processing unit; and

performing a signal check after the generating the fault signal with a signal checking module executed by the electronic processing unit, including

retrieving the drive cycle information from the electronic memory,

determining whether to execute a signal check function based on the drive cycle information,

executing the signal check function with a lateral acceleration signal,

determining whether the lateral acceleration signal passes the signal check function, and

generating a reset signal when the lateral acceleration signal passes the signal check, the reset signal causing at least one of the tell-tale indicator to be deactivated or the vehicle control module to resume operation in the first operating state.

13. A method as set forth in claim 12, wherein monitoring the operation of the acceleration sensor includes detecting a fault with the lateral acceleration signal and generating the fault signal based on the detection of the fault.

14. A method as set forth in claim 12, wherein executing the signal check function includes comparing the lateral acceleration signal with a predetermined threshold.

15. A method as set forth in claim 14, wherein comparing the lateral acceleration signal with the predetermined threshold further includes comparing a lateral acceleration value with the predetermined threshold.

16. A method as set forth in claim 12, wherein executing the signal check function further includes determining a maximum yaw rate value from a measured value from a yaw rate sensor and a modeled value calculated from the acceleration sensor, determining a minimum yaw rate value from the measured value and the modeled value, and comparing the difference of the maximum yaw rate value and the minimum yaw rate value with a predetermined threshold, and wherein determining whether the lateral acceleration signal passes the signal check function is based on the comparison of the difference of the maximum yaw rate value and the minimum yaw rate value with the predetermined threshold.

17. A method as set forth in claim 12, wherein the lateral acceleration signal includes lateral acceleration information including an offset value.

18. A method as set forth in claim 17, wherein executing the signal check function includes comparing the offset value with a predetermined threshold, the predetermined threshold being based on a distance value.

19. A method as set forth in claim 12, wherein executing the signal check function includes performing a plausibility check with the lateral acceleration signal.

20. A method as set forth in claim 12, wherein executing the signal check function includes performing a stuck signal check with the lateral acceleration signal.