Vehicle braking mode for competitive driving

Patent metadata

Field	Value
Publication number	US-2018170331-A1
Application number	US-201615384456-A
Country	US
Kind code	A1
Filing date	Dec 20, 2016
Priority date	Dec 20, 2016
Publication date	Jun 21, 2018
Grant date	—

Abstract

A braking system for a vehicle has a first axle with a first road wheel arranged proximate a first vehicle end, and a second axle with a second road wheel arranged proximate a second vehicle end. The braking system includes a first brake assembly configured to apply a braking force to the first road wheel and a second brake assembly configured to apply a braking force to the second road wheel. The braking system additionally includes a controller for regulating the braking force of each of the first and second brake assemblies. Furthermore, the braking system includes a switch for communicating a request to the controller to apply the braking force via the first brake assembly when the vehicle is in motion, but not via the second brake assembly. The request from the switch is intended to stop rotation and generate a slide of the first road wheel.

First claim

1 . A braking system for a vehicle having a first axle that includes a first road wheel arranged proximate a first vehicle end, and a second axle that includes a second road wheel arranged proximate a second vehicle end, the braking system comprising:
a first brake assembly operatively connected to the first road wheel and configured to apply a first braking force to the first road wheel; a second brake assembly operatively connected to the second road wheel and configured to apply a second braking force to the second road wheel; a controller configured to regulate application of the first and second braking forces via the respective first and second brake assemblies; and an electronic parking brake switch configured to be triggered by an operator of the vehicle to engage a parking brake function via the first brake assembly and configured to communicate a request to the controller to apply the first braking force to the first road wheel via the first brake assembly when the vehicle is in motion relative to a road surface, but not to the second braking force via the second brake assembly, and thereby stop rotation and generate a slide of the first road wheel relative to the road surface.

2 . The braking system according to claim 1 , further comprising a fluid source configured to supply a pressurized fluid to each of the first and second brake assemblies and thereby apply the respective first and second braking forces, wherein the controller is in operative communication with the fluid source and configured to regulate a release of the pressurized fluid from the fluid source to the first and second brake assemblies.

3 . The braking system according to claim 2 , wherein the request to the controller to apply the first braking force to the first road wheel via the switch is a request to release the pressurized fluid to the first brake assembly, but not to the second brake assembly.

4 . The braking system according to claim 2 , further comprising a first hydraulic passage fluidly connecting the fluid source to the first brake assembly and a second hydraulic passage fluidly connecting the fluid source to the second brake assembly.

5 . The braking system according to claim 4 , wherein the fluid source includes a fluid pump in fluid communication with the first brake assembly via the first hydraulic passage, and wherein the controller is configured to operate the fluid pump to apply the first braking force via the first brake assembly in response to the request from the switch to stop rotation and generate a slide of the first road wheel relative to the road surface.

6 . The braking system according to claim 5 , further comprising an anti-lock braking system (ABS) module operatively connected to the controller, wherein the fluid pump is configured as an ABS pump incorporated into the ABS module.

7 . The braking system according to claim 6 , wherein:
the ABS module includes a first valve configured to control a flow of the pressurized fluid through the first hydraulic passage to apply the first braking force via the first brake assembly and a second valve configured to control a flow of the pressurized fluid through the second hydraulic passage to apply the second braking force via the second brake assembly; and the controller is configured to open the first valve to apply the first braking force via the first brake assembly, but not open the second valve to apply the second braking force via the second brake assembly, in response to the request from the switch to stop rotation and generate a slide of the first road wheel relative to the road surface.

8 . The braking system according to claim 1 , further comprising a first actuator configured to engage the first brake assembly to apply the first braking force at the first road wheel, and wherein the controller is configured to operate the first actuator to engage the first brake assembly in response to the request from the switch to stop rotation and generate a slide of the first road wheel relative to the road surface.

9 . (canceled)

10 . The braking system according to claim 1 , wherein the first vehicle end is a rear end of the vehicle and the first road wheel is a rear wheel of the vehicle, and wherein the vehicle includes two first road wheels, the braking system comprising two of the first brake assemblies operatively connected to the respective first road wheels, and wherein the controller is configured to apply the braking force to both first road wheels concurrently via the respective first brake assemblies when the vehicle is in motion relative to the road surface in response to the request from the switch.

11 . A vehicle comprising:
a vehicle body including a first vehicle body end and a second vehicle body end opposite of the first vehicle body end; a first axle including a first road wheel arranged proximate the first vehicle body end and a second axle including a second road wheel arranged proximate the second vehicle body end; and a braking system for retarding movement of the vehicle, including:
a first brake assembly operatively connected to the first road wheel and configured to apply a braking force to the first road wheel;
a second brake assembly operatively connected to the second road wheel and configured to apply a braking force to the second road wheel;
a controller configured to regulate application of the braking force via each of the first and second brake assemblies; and
an electronic parking brake switch configured to be triggered by an operator of the vehicle to engage a parking brake function via the first brake assembly, fixed relative to the vehicle body, and configured to communicate a request to the controller to apply the braking force to the first road wheel via the first brake assembly when the vehicle is in motion relative to a road surface, but not to the second road wheel via the second brake assembly, and thereby stop rotation and generate a slide of the first road wheel relative to the road surface.

12 . The vehicle according to claim 11 , wherein the braking system additionally includes a fluid source configured to supply a pressurized fluid to each of the first and second brake assemblies and thereby apply the braking force at the respective first and second road wheels, wherein the controller is in operative communication with the fluid source and configured to regulate a release of the pressurized fluid from the fluid source to the first and second brake assemblies.

13 . The vehicle according to claim 12 , wherein the request to the controller to apply the first braking force to the first road wheel via the switch is a request to release the pressurized fluid to the first brake assembly, but not to the second brake assembly.

14 . The vehicle according to claim 12 , further comprising a first hydraulic passage fluidly connecting the fluid source to the first brake assembly and a second hydraulic passage fluidly connecting the fluid source to the second brake assembly.

15 . The vehicle according to claim 14 , wherein the fluid source includes a fluid pump in fluid communication with the first brake assembly via the first hydraulic passage, and wherein the controller is configured to operate the fluid pump to apply the first braking force via the first brake assembly in response to the request from the switch to stop rotation and generate a slide of the first road wheel relative to the road surface.

16 . The vehicle according to claim 15 , wherein the braking system additionally includes an anti-lock braking system (ABS) module operatively connected to the controller, and wherein the fluid pump i

Assignees

• Gm Global Tech Operations Llc

Inventors

• Barber Christopher J
• Tung Michael F

Classifications

• B60T2270/10

  ABS control systems · CPC title

• B60T8/176

  Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS (B60T8/1755 takes precedence) · CPC title

• B60T2201/06

  Hill holder; Start aid systems on inclined road · CPC title

• B60T8/26 Primary

  characterised by producing differential braking between front and rear wheels {(using electrical circuitry or regulation means B60T8/17)} · CPC title

• B60T8/17616 Primary

  Microprocessor-based systems · CPC title