Driving dynamics control system having an expanded braking function

• US 7,949,454 B2
• Filed: 11/13/2006
• Issued: 05/24/2011
• Est. Priority Date: 11/11/2005
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Graf, Gerald
• Primary Examiner(s): Nguyen; Cuong H
• Application Number:
  US11/598,937
• Publication Number:
  US 20070219699A1
• Time in Patent Office: 1,653 Days
• Field of Search: 701 70- 72, 701/42, 701/83, 303/187, 303/112, 303/312, 303/189, 180/197, 180/411, 180/282, 477183-188
• US Class Current: 701/70
• 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. A computer-implemented method for stabilizing a vehicle in an unstable driving situation, wherein the unstable driving situation includes understeering while cornering, the method comprising:

triggering, by a computer processor, at least one actuator for braking a plurality of wheels of the vehicle in order to reduce a driving speed of the vehicle, such that 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;

wherein the computer processor initially calculates a braking torque for application to the at least one rear wheel, and, when a wheel slip of the at least one rear wheel exceeds a threshold slip value, a portion of the braking torque calculated for application to the at least one rear wheel that exceeds the threshold slip value is applied to the at least one front wheel.

2. The method as recited in claim 1, 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.

3. The method as recited in claim 1, wherein a braking torque applied to an inside front wheel is greater than a braking torque applied to an outside front wheel while cornering.

4. The method as recited in claim 1, wherein no braking torque is applied to an outside front wheel while cornering.

5. The method as recited in claim 4, wherein a braking torque greater than zero is applied to an inside front wheel while cornering.

6. The method as recited in claim 1, further comprising:

calculating, by a control unit, an indicator variable indicating an understeering tendency of the vehicle.

7. The method as recited in claim 6, 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.

8. The method as recited in claim 1, wherein the portion of the braking torque calculated for application to the at least one rear wheel that exceeds the threshold slip value is applied to an inside front wheel.