Stability control system having loading information

• US 20040176889A1
• Filed: 03/04/2003
• Published: 09/09/2004
• Est. Priority Date: 03/04/2003
• Status: Active Grant

• Current Assignee: Continental Automotive Systems, Inc. (Continental AG)
• Original Assignee: Continental Teves Incorporated (Continental AG)
• Inventors: Capito, Russell T.
• Granted Patent: US 6,937,928 B2
• Time in Patent Office: Days
• US Class Current: 701/37
• CPC Class Codes: B60G 17/0162 mainly during a motion involving steering operation, e.g. cornering, overtaking B60G17/0164 takes precedence
• CPC Class Codes: B60G 17/0182 involving parameter estimation, e.g. observer, Kalman filter
• CPC Class Codes: B60G 2400/0511 Roll angle
• CPC Class Codes: B60G 2400/0523 Yaw rate
• CPC Class Codes: B60G 2400/104 lateral or transversal with regard to vehicle
• CPC Class Codes: B60G 2400/106 longitudinal with regard to vehicle, e.g. braking
• CPC Class Codes: B60G 2400/252 vertical
• CPC Class Codes: B60G 2400/61 Load distribution
• CPC Class Codes: B60G 2400/822 Road friction coefficient determination affecting wheel traction
• CPC Class Codes: B60G 2400/823 Obstacle sensing
• CPC Class Codes: B60G 2600/1873 Model Following
• CPC Class Codes: B60G 2600/1877 Adaptive Control
• CPC Class Codes: B60G 2800/016 Yawing condition
• CPC Class Codes: B60G 2800/24 Steering, cornering

Abstract

A stability control system includes a sensor for measuring the position of the suspension system. Alternatively, the sensor may directly detect the load on the suspension system. With this information, the system calculates a vehicle loading condition. A yaw rate model is selected based on the calculated vehicle loading condition. Preferably, a number of loading condition values are stored and a controller selects the best fitting loading condition value to serve as the yaw rate model.

Claims

1. A method for providing stability control in an automotive vehicle having wheels connected to the vehicle via a suspension system, the method comprising the steps of:

sensing the position of the suspension system of the vehicle;

calculating a vehicle loading condition based on the sensed position of the suspension system; and

selecting a stability control model for the vehicle based on the calculated vehicle loading condition.

2. The method of claim 1, further comprising the step of calculating a vehicle roll angle based on the vehicle loading condition.

3. The method of claim 1, further comprising the step of calculating a vehicle roll rate based on the vehicle loading condition.

4. The method of claim 1, further comprising the step of calculating a longitudinal acceleration of the vehicle based on the vehicle loading condition.

5. The method of claim 4, wherein the step of calculating a longitudinal acceleration is based on the change in position of the suspension for the front wheels relative to the suspension for the rear wheels.

6. The method of claim 1, further comprising the step of calculating a lateral acceleration of the vehicle based on the vehicle loading condition.

7. The method of claim 6, wherein the step of calculating a longitudinal acceleration is based on the change in position of the suspension for the left wheels relative to the suspension for the rear wheels.

8. The method of claim 1, further comprising the step of calculating a vehicle bank angle based on the vehicle loading condition.

9. The method of claim 8, further comprising the step of correcting a lateral acceleration based on the vehicle bank angle.

10. The method of claim 1, further comprising the step of detecting a bump in the surface over which the vehicle is traveling based on the vehicle loading condition.

11. The method of claim 10, further comprising the step of preventing engagement of electronic stability control when a bump is detected.

12. The method of claim 1, further comprising the step of calculating a surface friction coefficient based on the vehicle loading condition.

13. The method of claim 12, wherein the step of sensing the position of the suspension system includes determining a vertical acceleration of the wheels.

14. The method of claim 13, wherein the step of calculating the surface friction coefficient is based on lateral and longitudinal acceleration values of the vehicle relative to the vertical acceleration of the wheels.

15. The method of claim 1, wherein the step of selecting a stability control model includes the step of writing the vehicle loading condition to a non-volatile memory storage area.

16. The method of claim 1, wherein the step of selecting a stability control model includes the steps of comparing the calculated vehicle loading condition with stored values of loading conditions and selecting the best fitting stability control model.

17. The method of claim 16, wherein the step of selecting the best fitting stability control model includes interpolating between two stored values of loading conditions to define the best fitting stability control model.

18. The method of claim 1, wherein the step of selecting a stability control model occurs after the vehicle ignition has been turned on but before the vehicle begins travel.

19. A stability control system for an automotive vehicle having wheels connected to the vehicle via a suspension system, the stability control system comprising:

a suspension sensor for monitoring the suspension system of the vehicle and sending a loading condition signal;

a controller for receiving the loading condition signal; and

the controller comparing the loading condition signal to stored loading condition values and selecting the best fitting loading condition values to serve as the stability control model for the vehicle.

20. The stability control system of claim 19, wherein the suspension sensor includes an individual sensor for each wheel.

21. The stability control system of claim 19, wherein the suspension sensor is a position sensor.

22. The stability control system of claim 21, wherein the suspension sensor measures the position of the front wheels relative to the rear wheels.

23. The stability control system of claim 21, wherein the suspension travel sensor measures the position of the right wheels relative to the left wheels.

24. The stability control system of claim 19, wherein the controller selects the best fitting loading condition value by interpolating between stored loading condition values.

25. The stability control system of claim 19, further comprising a non-volatile memory for storing the selected stability control model.

26. The stability control system of claim 19, wherein the suspension sensor is integrally formed with the suspension system as an active suspension system.