VIRTUAL ACCELEROMETER

• US 20080082245A1
• Filed: 09/13/2006
• Published: 04/03/2008
• Est. Priority Date: 09/13/2006
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Kim, Min K., Fayyad, Haytham A.
• Granted Patent: US 7,885,748 B2
• Time in Patent Office: Days
• US Class Current: 701/84
• CPC Class Codes: B60T 2260/04 Automatic transmission
• CPC Class Codes: B60T 8/1755 Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02
• CPC Class Codes: B60W 2050/0013 Optimal controllers
• CPC Class Codes: B60W 2530/10 Weight
• CPC Class Codes: B60W 2530/20 Tyre data
• CPC Class Codes: B60W 40/107 Longitudinal acceleration
• CPC Class Codes: B60W 40/13 Load or weight
• CPC Class Codes: B60W 50/02 Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
• CPC Class Codes: Y10S 477/904 Control signal is acceleration

Abstract

A vehicle control system for regulatng operation of a vehicle having a transmission includes a first module that processes an output shaft signal which is based on rotation of an output shaft of the transmission through a third order Kalman filter to determine an acceleration of the output shaft A second module calculates the acceleration of the vehicle based on the acceleration of said output shaft. A third module regulates operation of the vehicle based on the acceleration of the vehicle.

Claims

1. A vehicle control system for regulating operation of a vehicle having a transmission, comprising:

a first module that processes an output shaft signal, which is based on rotation of an output shaft of said transmission, through a third order Kalman filter to determine an acceleration of said output shaft;

a second module that calculates said acceleration of said vehicle based on said acceleration of said output shaft, and

a third module that regulates operation of said vehicle based on said acceleration of said vehicle.

2. The vehicle control system of claim 1 wherein said acceleration of said vehicle is a longitudinal acceleration.

3. The vehicle control system of claim 1 wherein said acceleration of said vehicle is further determined based on a wheel radius and a vehicle mass.

4. The vehicle control system of claim 3 wherein said wheel radius and said vehicle mass are both constants pre-programmed into respective memory modules.

5. The vehicle control system of claim 3 further comprising respective modules that determine said wheel radius and said vehicle mass based on vehicle operating parameters.

6. The vehicle control system of claim 1 wherein said first module calculates a derivative of said acceleration of said output shaft, and provides said derivative as a feedback to said Kalman filter, wherein said acceleration of said output shaft is further determined based on said derivative.

7. The vehicle control system of claim 1 wherein said third module regulates by adjusting a shift command of said transmission based on said acceleration of said vehicle.

8. The vehicle control system of claim 7 further comprising a fourth module that calculates a vehicle speed based on said output shaft signal, wherein said adjusting is further based on said vehicle speed,

9. The vehicle control system of claim 1 wherein said third module regulates by operating a vehicle stability control system based on said acceleration of said vehicle.

10. The vehicle control system of claim 9 further comprising a fourth module that calculates a vehicle speed based on said output shaft signal, wherein said vehicle stability control system is further operated based on said vehicle speed.

11. A method of determining an acceleration of a vehicle having a transmission, comprising:

generating an output shaft signal based on rotation of an output shaft of said transmission;

processing said output shaft signal through a third order Kalman filter to determine an acceleration of said output shaft; and

calculating said acceleration of said vehicle based on said acceleration of said output shaft.

12. The method of claim 11 wherein said acceleration of said vehicle is a longitudinal acceleration.

13. The method of claim 11 wherein said acceleration of said vehicle is further determined based on a wheel radius and a vehicle mass.

14. The method of claim 13 wherein said wheel radius and said vehicle mass are both constants pre-programmed into a memory.

15. The method of claim 13 further comprising determining said wheel radius and said vehicle mass based on vehicle operating parameters,

16. The method of claim 11 further comprising;

calculating a derivative of said acceleration of said output shaft; and

providing said derivative as a feedback to said Kalman filter, wherein said acceleration of said output shaft is further determined based on said derivative.

17. A method of regulating operation of a vehicle having a transmission, comprising:

generating an output shaft signal based on rotation of an output shaft of said transmission;

processing said output shaft signal through a third order Kalman filter to determine an acceleration of said output shaft;

calculating said acceleration of said vehicle based on said acceleration of said output shaft; and

regulating operation of said vehicle based on said acceleration of said vehicle.

18. The method of claim 17 wherein said acceleration of said vehicle is a longitudinal acceleration.

19. The method of claim 17 wherein said acceleration of said vehicle is further determined based on a wheel radius and a vehicle mass.

20. The method of claim 19 wherein said wheel radius and said vehicle mass are both constants pre-programmed into a memory.

21. The method of claim 19 further comprising determining said wheel radius and said vehicle mass based on vehicle operating parameters,

22. The method of claim 17 further comprising:

calculating a derivative of said acceleration of said output shaft; and

providing said derivative as a feedback to said Kalman filter wherein said acceleration of said output shaft is further determined based on said derivative.

23. The method of claim 17 wherein said regulating includes adjusting a shift command of said transmission based on said acceleration of said vehicle.

24. The method of claim 23 further comprising calculating a vehicle speed based on said output shaft signal, wherein said adjusting is further based on said vehicle speed.

25. The method of claim 17 wherein said regulating includes operating a vehicle stability control system based on said acceleration of said vehicle.

26. The method of claim 25 further comprising calculating a vehicle speed based on said output shaft signal wherein said vehicle stability control system is further operated based on said vehicle speed.