Driving dynamics control system having an expanded braking function

• US 20070219699A1
• Filed: 11/13/2006
• Published: 09/20/2007
• Est. Priority Date: 11/11/2005
• Status: Active Grant

• Current Assignee: Gerald Graf
• Original Assignee: Gerald Graf
• Inventors: Graf, Gerald
• Granted Patent: US 7,949,454 B2
• Time in Patent Office: Days
• US Class Current: 701/72
• 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

Abstract

In a method for stabilizing a vehicle in extreme driving situations, in particular when understeering while cornering, multiple wheels are decelerated in order to reduce the driving speed. A maximum cornering force of the wheels and thus a minimal curve radius may be achieved if in particular the rear wheels are decelerated and a higher braking torque is applied on the rear wheels than on the front wheels and in the process in particular the outside front wheel remains highly underdecelerated.

Claims

1-12. -12. (canceled)

13. A method for stabilizing a vehicle in an unstable driving situation, wherein the unstable driving situation includes understeering while cornering, the method comprising:

braking a plurality of wheels of the vehicle in order to reduce a driving speed of the vehicle, wherein a braking torque applied to at least one rear wheel of the vehicle is greater than a braking torque applied to at least one front wheel of the vehicle.

14. The method as recited in claim 13, wherein a braking torque is applied to two rear wheels of the vehicle, and wherein the braking torque applied to the two rear wheels is greater than the braking torque applied to the at least one front wheel.

15. The method as recited in claim 13, wherein a braking torque applied to an inside front wheel is greater than a braking torque applied to an outside front wheel while cornering.

16. The method as recited in claim 13, wherein no braking torque is applied to an outside front wheel while cornering.

17. The method as recited in claim 13, further comprising:

calculating an indicator variable indicating an understeering tendency of the vehicle.

18. The method as recited in claim 17, wherein the indicator variable is calculated as a function of a yaw rate of the vehicle desired by a driver and a measured yaw rate of the vehicle.

19. A device for stabilizing a vehicle in an unstable driving situation, wherein the unstable driving situation includes understeering while cornering, comprising:

a sensor system configured to detect a plurality of driving condition variables; and

a control unit configured to process sensor system signals and determine whether a trigger threshold is exceeded, wherein, if the trigger threshold has been exceeded, the control unit triggers a plurality of braking actuators associated with a corresponding plurality of wheels of the vehicle in order to perform a braking intervention to decelerate the vehicle, wherein the braking intervention includes applying a greater braking torque to at least one rear wheel of the vehicle than to at least one front wheel of the vehicle.

20. The device as recited in claim 19, wherein a braking torque is applied to two rear wheels of the vehicle, and wherein the braking torque applied to the two rear wheels is greater than the braking torque applied to the at least one front wheel.

21. The device as recited in claim 19, wherein a greater braking torque is applied to an inside front wheel of the vehicle than to an outside front wheel of the vehicle while cornering.

22. The device as recited in claim 19, wherein no braking torque is applied to an outside front wheel of the vehicle while cornering.

23. The device as recited in claim 19, wherein the control unit includes a first calculation unit configured to calculate a setpoint deceleration value.

24. device as recited in claim 23, wherein the control unit includes a second calculation unit configured to calculate a plurality of braking torques for the plurality of wheels of the vehicle.