Regulation of Driving Dynamics, Featuring Advanced Build-Up of Pressure at the Wheel to Be Regulated

• US 20070282510A1
• Filed: 10/22/2004
• Published: 12/06/2007
• Est. Priority Date: 12/03/2003
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Hey, Matthias, Nimmo, Matthew
• Granted Patent: US 7,848,866 B2
• Time in Patent Office: Days
• US Class Current: 701/70
• CPC Class Codes: B60T 2201/122 Pre-actuation in case of ESP control
• CPC Class Codes: B60T 2220/03 Driver counter-steering; Avoidance of conflicts with ESP control
• CPC Class Codes: B60T 2230/03 Overturn, rollover
• CPC Class Codes: B60T 8/243 for roll-over protection
• CPC Class Codes: B60T 8/246 Change of direction

Abstract

A method for improving the efficiency of a driving dynamics regulating system which intervenes in the driving operation in critical driving situations by automatic braking intervention at selected wheels. It is possible for the reaction speed of the brake system 3 to be considerably increased if, before the actual regulating intervention, the imminent critical driving situation is already detected and a slight preparatory brake pressure is already built up at at least one wheel at which a future regulating intervention is expected.

Claims

1-8. -8. (canceled)

9. A method for stabilizing a vehicle in a critical driving situation, comprising:

detecting the critical driving situation by a sensor system;

causing a regulating algorithm to intervene in a driving operation of the vehicle under a predefined condition using a brake system; and

before a stabilization intervention, building up a preparatory brake pressure of a low level at a wheel brake of a wheel at which the stabilization intervention is shortly expected.

10. The method as recited in claim 9, further comprising:

determining and monitoring a lateral acceleration of the vehicle and a steering speed in relation to threshold values;

building up the preparatory brake pressure if the lateral acceleration of the vehicle exceeds a first predefined threshold value and the steering speed falls below a second predefined threshold value.

11. The method as recited in claim 10, wherein the preparatory brake pressure is built up during a lane-changing maneuver, in which a first steering maneuver and a second steering maneuver in the opposite direction take place within a predefined time, if, in the second steering maneuver, the lateral acceleration is greater than a predefined threshold value and the steering speed falls below a threshold value.

12. The method as recited in claim 11, wherein the first steering maneuver has a lateral acceleration and a steering speed that each exceeds a respective one of the first predefined threshold value and the second predefined threshold value.

13. The method as recited in claim 9, further comprising:

deactivating the building up the preparatory brake pressure if a predefined deactivation condition is met.

14. The method as recited in claim 13, wherein the deactivation condition is a signal of the regulating algorithm with which a braking intervention is requested.

15. The method as recited in claim 14, wherein the deactivation condition is that a change in a steering angle over a predefined time is smaller than a predefined threshold value.

16. A driving dynamics regulating system for stabilizing a vehicle in a critical driving situation, comprising:

a control unit in which a driving dynamics regulating algorithm is stored;

a sensor system for registering variables describing a driving condition; and

a brake system for performing a stabilization intervention, wherein, before the stabilization intervention, the control unit already activates a wheel brake of a wheel at which stabilization intervention is shortly expected and builds up a preparatory brake pressure of a low level.