METHODS AND SYSTEMS FOR BRAKING DIFFERENT AXLES OF A VEHICLE USING A DECELERATION VALUE

• US 20110049974A1
• Filed: 08/31/2009
• Published: 03/03/2011
• Est. Priority Date: 08/31/2009
• Status: Abandoned Application

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: KIDSTON, KEVIN S., MUI, DANNY Y., KARABA, MATTHEW M., KRUEGER, ERIC E., MONSERE, PATRICK J., LOGAN, JON K., RICHARDS, MARGARET C.
• Application Number:
  US12/550,739
• Publication Number:
  US 20110049974A1
• Time in Patent Office: Days
• US Class Current: 303/152
• CPC Class Codes: B60T 2270/604 Merging friction therewith; Adjusting their repartition
• CPC Class Codes: B60T 2270/608 Electronic brake distribution (EBV/EBD) features related thereto
• CPC Class Codes: B60T 8/1766 Proportioning of brake forces according to vehicle axle loads, e.g. front to rear of vehicle

Abstract

A method for controlling braking of a vehicle having a first axle and a second axle includes the steps of obtaining a deceleration value pertaining to an input from a driver of the vehicle, braking the first axle with a first pressure, braking the second axle with a second pressure that is substantially equal to the first pressure if the deceleration value has not exceeded a predetermined threshold, and braking the second axle with a third pressure that is greater than the first pressure if the deceleration value has exceeded the predetermined threshold.

Claims

1. A method for controlling braking of a vehicle having a first axle and a second axle, the method comprising the steps of:

obtaining a deceleration value pertaining to an input from a driver of the vehicle;

braking the first axle with a first pressure;

braking the second axle with a second pressure that is substantially equal to the first pressure if the deceleration value has not exceeded a predetermined threshold; and

braking the second axle with a third pressure that is greater than the first pressure if the deceleration value has exceeded the predetermined threshold.

2. The method of claim 1, wherein the step of braking the second axle with the third pressure further comprises the step of:

braking the second axle with the third pressure if the deceleration value has exceeded the predetermined threshold, and provided further that the deceleration value has not subsequently been less than a second predetermined threshold.

3. The method of claim 2, further comprising the step of:

braking the second axle with a fourth pressure that is substantially equal to the first pressure if the deceleration value has exceeded the predetermined threshold and has subsequently been less than the second predetermined threshold.

4. The method of claim 1, further comprising the steps of:

obtaining a request corresponding to a requested braking torque from the driver; and

determining the deceleration value based on the requested braking torque.

5. The method of claim 4, wherein the deceleration value comprises a measure of a requested deceleration of the vehicle.

6. The method of claim 1, wherein

the first axle is a regenerative braking axle;

and

the second axle is a non-regenerative braking axle.

7. A method for controlling braking of a vehicle having a regenerative braking axle and a non-regenerative braking axle, the method comprising the steps of:

obtaining a deceleration value pertaining to an input from a driver of the vehicle;

braking the regenerative braking axle and the non-regenerative braking axle using single channel blending provided that the deceleration value is less than or equal to a predetermined threshold; and

braking the regenerative braking axle and the non-regenerative braking axle using dual channel blending if the deceleration value is greater than the predetermined threshold.

8. The method of claim 7, further comprising the step of:

transitioning from the single channel blending to the dual channel blending, if the deceleration value is greater than the predetermined threshold and single channel blending is being used.

9. The method of claim 7, further comprising the step of:

transitioning from the dual channel blending to the single channel blending, if each of the following conditions is satisfied;

the deceleration value is less than the predetermined threshold;

dual channel blending is being used; and

the deceleration value is less than a second predetermined threshold.

10. The method of claim 7, further comprising the step of:

braking the regenerative braking axle and the non-regenerative braking axles with at least substantially equal pressures provided that the deceleration value is less than or equal to the predetermined threshold.

11. The method of claim 10, further comprising the step of:

braking the non-regenerative braking axle with a first pressure and the regenerative braking axle with a second pressure, less than the first pressure, if the deceleration value is greater than the predetermined threshold.

12. The method of claim 7, further comprising the steps of:

obtaining a request corresponding to a requested braking torque from the driver; and

determining the deceleration value based on the requested braking torque.

13. The method of claim 12, wherein the deceleration value comprises a measure of a requested deceleration of the vehicle.

14. A system for controlling braking of a vehicle having a regenerative braking axle and a non-regenerative braking axle, the system comprising:

a sensor configured to detect a request corresponding to a requested braking torque; and

a processor coupled to the sensor and configured to facilitate;

determining a deceleration pertaining to the vehicle based on the requested braking torque;

braking the regenerative braking axle and the non-regenerative braking axle using single channel blending provided that the deceleration value is less than or equal to a predetermined threshold; and

braking the regenerative braking axle and the non-regenerative braking axle using dual channel blending if the deceleration value is greater than the predetermined threshold.

15. The system of claim 14, wherein the deceleration value comprises a measure of a requested deceleration of the vehicle.

16. The system of claim 14, wherein the processor is further configured to facilitate:

transitioning from the single channel blending to the dual channel blending, if the deceleration value is greater than the predetermined threshold and single channel blending is being used.

17. The system of claim 14, wherein the processor is further configured to at least facilitate transitioning from the dual channel blending to the single channel blending, if each of the following conditions is satisfied:

the deceleration value is less than the predetermined threshold;

dual channel blending is being used; and

the deceleration value is less than a second predetermined threshold.

18. The system of claim 14, wherein the processor is further configured to facilitate:

braking the regenerative braking axle and the non-regenerative braking axles with at least substantially equal pressures provided that the deceleration value is less than or equal to the predetermined threshold.

19. The system of claim 18, wherein the processor is further configured to facilitate:

braking the non-regenerative braking axle with a first pressure and the regenerative braking axles with a second pressure, less than the first pressure, if the deceleration value is greater than the predetermined threshold.

20. The system of claim 14, further comprising:

a memory configured to store the predetermined threshold.