Method for producing a differential torque acting on the vehicle wheels of a vehicle

• US 8,818,667 B2
• Filed: 05/03/2010
• Issued: 08/26/2014
• Est. Priority Date: 06/08/2009
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: van Vliet, Peter
• Primary Examiner(s): Beaulieu, Yonel
• Application Number:
  US13/265,287
• Publication Number:
  US 20120046842A1
• Time in Patent Office: 1,576 Days
• Field of Search: 701 69- 70, 701 36- 38, 280/248, 280233-234
• US Class Current: 701/69
• CPC Class Codes: B60W 2520/14 Yaw
• CPC Class Codes: B60W 2720/14 Yaw
• CPC Class Codes: B60W 2720/30 Wheel torque
• CPC Class Codes: B60W 30/18072 Coasting

Abstract

In a method for generating a differential torque in a vehicle, in the case in which the vehicle is in a load change state and simultaneously in an extreme driving situation, in which wheel torques of different magnitudes are present at the vehicle wheels, the torque distribution between the vehicle wheels is changed.

Claims

1. A method for generating a differential torque acting on vehicle wheels of a vehicle, comprising:

detecting a load change and an extreme driving situation that are simultaneous with one another;

responsive to the detection of the load change and the extreme driving situation, changing a torque distribution between vehicle wheels in a case in which wheel torques of different magnitudes are present at the vehicle wheels;

wherein the load change is at least one of;

(a) a change from an acceleration state to an overrun state by a sudden release of an accelerator, and (b) a change from an overrun state to an acceleration state by a sudden application of an accelerator.

2. The method as recited in claim 1, wherein the torque distribution between the vehicle wheels is changed in such a way that a vehicle wheel originally having a lower wheel torque is acted upon by a wheel torque exceeding another vehicle wheel.

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

checking whether a differential torque, formed from a difference of the wheel torques, exceeds a boundary value to determine if the vehicle is in an extreme driving situation.

4. The method as recited in claim 3, wherein the differential torque is determined from at least one of an actual yaw rate, a setpoint yaw rate, and other state variables of the vehicle.

5. The method as recited in claim 1, wherein the load change is detected from one of a change in a course of a drive torque, or a variable correlated to the change in the course of the drive torque.

6. The method as recited in claim 5, wherein the load change is detected from a change in a course of a cardan torque that is active in a cardan shaft in the vehicle.

8. The method as recited in claim 1, wherein the differential torque is generated by a braking intervention.

9. The method as recited in claim 1, wherein the differential torque is generated by a distribution of the drive torque.

7. A method for generating a differential torque acting on vehicle wheels of a vehicle, comprising:

detecting a load change and an extreme driving situation that are simultaneous with one another;

responsive to the detection of the load change and the extreme driving situation, changing a torque distribution between vehicle wheels in a case in which wheel torques of different magnitudes are present at the vehicle wheels, wherein the load change is detected from one of a change in a course of a drive torque, or a variable correlated to the change in the course of the drive torque, wherein, to detect the load change, the observed torque is filtered, and a difference of the unfiltered and the filtered torque is formed, the load change being present if the difference exceeds a threshold value.

10. A control device for generating a differential torque acting on vehicle wheels of a vehicle, the control device configured to change a torque distribution between vehicle wheels in a case in which the vehicle is in a load change and simultaneously in an extreme driving situation in which wheel torques of different magnitudes are present at the vehicle wheels wherein the load change is at least one of:

(a) a change from an acceleration state to an overrun state by a sudden release of an accelerator, and (b) a change from an overrun state to an acceleration state by a sudden application of an accelerator.

11. A device in a vehicle having an electronic stability program having a control device, the control device for generating a differential torque acting on vehicle wheels of a vehicle, the control device configured to change a torque distribution between vehicle wheels wherein the load change is at least one of:

(a) a change from an acceleration state to an overrun state by a sudden release of an accelerator, and (b) a change from an overrun state to an acceleration state by a sudden application of an accelerator in a case in which the vehicle is in a load change and simultaneously in an extreme driving situation in which wheel torques of different magnitudes are present at the vehicle wheels.

12. The device as recited in claim 11, further comprising:

an actuating device for generating a differential torque between the vehicle wheels.