Systems and Methods for Compensation for a Dynamic Axle Load Transfer

• US 20070225896A1
• Filed: 05/06/2005
• Published: 09/27/2007
• Est. Priority Date: 05/10/2004
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: Steimel, Christoph
• Granted Patent: US 7,725,251 B2
• Time in Patent Office: Days
• US Class Current: 701/124
• CPC Class Codes: B60T 2230/06 Tractor-trailer swaying
• CPC Class Codes: B60T 2270/303 Stability control with active acceleration
• CPC Class Codes: B60T 8/1766 Proportioning of brake forces according to vehicle axle loads, e.g. front to rear of vehicle
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/18 including control of braking systems
• CPC Class Codes: B60W 10/22 including control of suspension systems
• CPC Class Codes: B60W 30/045 Improving turning performance

Abstract

The present invention proposes an improved method for at least partially compensating for the dynamic transfer of an axle load when part of a motor vehicle load dips over at least one front wheel. A demand for a drive moment is applied and thus a time-limited virtually maximum drive moment is produced for the purposes of compensating for the transfer of the axle load. Moreover, for the first time, the present invention proposes a microprocessor and also a control device for carrying out this method in accordance with the invention. Furthermore, a motor vehicle drive is indicated which is equipped with such a control device or such a microprocessor. Finally, software is designated for carrying out the method. A motor vehicle is presented which is equipped with such a control device or such a microprocessor for the execution of the software for carrying out the method in accordance with the invention.

Claims

1. A method for at least partially compensating for the dynamic transfer of an axle load in a motor vehicle, comprising:

increasing or reducing a drive moment of the motor vehicle without substantially altering the speed of the motor vehicle.

2. A method in accordance with claim 1, wherein increasing the drive moment includes applying an accelerator stroke is applied.

3. A method in accordance with claim 1, wherein during a forwardly directed dynamic transfer of the axle load when implementing a full braking action, a demand for drive moment, preferably an accelerator stroke, is applied during the full braking action.

4. A method in accordance with claim 1, wherein, during a diagonally forwardly directed and/or laterally directed dynamic transfer of the axle load when driving in a curve, a demand for drive moment, preferably an accelerator stroke, is applied when driving in the curve.

5. A method in accordance with claim 1, further comprising the following steps:

acquiring of situation-dependent chassis, braking, and/or steering data related to the prevailing stability of the motor vehicle, wherein the data is transmitted by sensors that sense the current situation of the motor vehicle within the framework of an integrated chassis control system (ICC)

determining a critical state of the motor vehicle and/or a state thereof requiring regulation with the aid of the acquired data,

defining a magnitude of a demanded drive moment that is to be demanded for the purposes of compensating for the axle load distribution,

defining a duration of the demanded drive moment;

initiating the demanded drive moment using the pre-determined magnitude and duration thereof by the application of a suitable demand.

6. A method in accordance with claim 1, wherein the full braking action is implemented with ABS support.

7. A method in accordance with claim 3, wherein the presence of the full braking action is determined by means of the detection of an ABS flag symbolizing the point at which the brakes are applied, a gradient of the pedal, or the pressure of a master brake cylinder.

8. A method in accordance with claim 3, wherein the presence of the full braking action is determined by means of a process of detecting the brake pedal angular setting corresponding to a completely depressed brake pedal.

9. A method in accordance with claim 3, wherein the presence of the full braking action or the presence of a critical situation when driving in a curve is determined by evaluating the data from an electronic stability program.

10. A method in accordance with claim 1, wherein, at the point of applying the brakes or in the presence of a critical situation when driving in a curve, an increase of drive moment is initiated by means of a kick-down or by a pulse of full power having a duration of 250 ms to 750 ms.

11. A method in accordance with claim 1, wherein the increase of drive moment, by means of a kick-down or by a pulse of full power, is initiated in a time window of −

0.5 seconds to +1.0 seconds, taken with reference to the point of applying the brakes as being the zero time point.

12. A method in accordance with claim 1, wherein the increase of drive moment, by means of a kick-down or by a pulse of full power, is built up in a pulsed manner from a plurality of increases of drive moment.

13. A method in accordance with claim 12, wherein the plurality of increases of drive moment, each have a time duration of 50 ms to 150 ms.

14. A method in accordance with claim 1, wherein a drive moment of at least 250 Nm is requested by the increase of the drive moment by means of an accelerator stroke or a pulse of full power.

15. A microprocessor for configured to at least partially compensate for the dynamic transfer of an axle load in a motor vehicle by increasing or reducing a drive moment without substantially altering the speed of the motor vehicle.

16. A control device configured to at least partially compensate for the dynamic transfer of an axle load in a motor vehicle by increasing or reducing a drive moment without substantially altering the speed of the motor vehicle.

17. A motor vehicle drive including at least one of a control device and a microprocessor configured to at least partially compensate for the dynamic transfer of an axle load in the motor vehicle by increasing or reducing a drive moment without substantially altering the speed of the motor vehicle.

18. Computer-readable medium having computer-executable instructions stored thereon which, when executed by a computer, will cause the computer to partially compensate for the dynamic transfer of an axle load in a motor vehicle by increasing or reducing a drive moment without substantially altering the speed of the motor vehicle.

19. A motor vehicle including comprising:

a control device;

computer-readable medium having computer-executable instructions stored thereon which, when executed by a the control device, causes the computer to partially compensate for the dynamic transfer of an axle load in the motor vehicle by increasing or reducing a drive moment without substantially altering the speed of the motor vehicle.