Foundation brake hill start aide system

• US 7,934,589 B2
• Filed: 01/24/2008
• Issued: 05/03/2011
• Est. Priority Date: 01/24/2008
• Status: Active Grant

• Current Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Original Assignee: Eaton Corp. (Wisconsin) (Eaton Corporation PLC.)
• Inventors: Devito, Gerard, Amsallen, Marcell, Duo, Leon, Groner, Shane, Karrer, Ben, Walker, James M.
• Primary Examiner(s): Lorence; Richard M.
• Application Number:
  US12/018,876
• Publication Number:
  US 20090192019A1
• Time in Patent Office: 1,195 Days
• Field of Search: 192/219.1, 303/192
• US Class Current: 192/219.1
• CPC Class Codes: B60T 2201/06 Hill holder; Start aid systems on inclined road
• CPC Class Codes: B60T 2260/04 Automatic transmission
• CPC Class Codes: B60T 7/122 for locking of reverse movement

Abstract

An exemplary embodiment of a Hill Start Aide system for a vehicle includes a brake system. The brake system including a brake actuator for manually actuating the brake system. The brake system is selectively configurable in a stopped configuration, where the brake system is manually maintained via the brake actuator such that a vehicle road wheel speed is about zero rpm, a released configuration, where the brake system will not generally inhibit rotation of at least one vehicle road wheel, and a control stop configuration, where the vehicle road wheel speed is about zero rpm. The Hill Start Aide system also includes a controller for at least partially controlling the brake system. The controller will selectively send a signal to maintain the brake system in the control stopped configuration when the brake actuator is manually released. The controller will send a signal to the brake system to release the brakes when a predetermined amount of time has elapsed after a transmission is manually shifted to a neutral configuration while the brake system is in the control stopped configuration.

Claims

1. A Hill Start Aide system for a vehicle comprising:

a brake system including a brake actuator for manually actuating the brake system, wherein the brake system is selectively configurable in a stopped configuration, where the brake system is manually maintained via the brake actuator such that a vehicle road wheel speed is about zero rpm, a released configuration, where the brake system will not generally inhibit rotation of at least one vehicle road wheel, and a control stop configuration, where the vehicle road wheel speed is about zero rpm;

a controller for at least partially controlling the brake system, wherein the controller will selectively send a signal to maintain the brake system in the control stopped configuration when the brake actuator is manually released, and wherein the controller will send a signal to the brake system to release the brakes when a predetermined amount of time has elapsed after a transmission is manually shifted to a neutral configuration while the brake system is in the control stopped configuration;

a sensor for detecting a transmission intended direction of vehicle travel;

a sensor for detecting a vehicle inclination, wherein the vehicle inclination is indicative of a vehicle propensity to move in a first direction when the vehicle brake system is in the released configuration; and

wherein the controller is adapted to prevent the brake system from being reconfigured to the control stop configuration when the detected transmission intended direction of vehicle travel is the first direction of travel.

2. The system of claim 1, wherein the brake system will selectively operate to reduce the speed of the vehicle.

3. The system of claim 1, wherein the vehicle wheel speed will not increase when the brake system is in the control stopped configuration regardless of operator manipulation of the brake actuator.

4. The apparatus of claim 1, further comprising a neutral sensing device for detecting a transmission neutral.

5. The apparatus of claim 4, wherein the controller is adapted to prevent the brake system from being reconfigured to the control stop configuration when the neutral sensing device detects the transmission neutral.

6. A method of controlling a Hill Start Aide system for a vehicle comprising:

detecting a vehicle inclination, wherein the vehicle inclination is indicative of a vehicle propensity to move in a first direction of vehicle travel when a vehicle brake system is not in a stopped configuration;

detecting a transmission intended direction of vehicle travel;

reconfiguring the brake system to a control stopped configuration when the detected transmission intended direction of vehicle travel is not the first direction of vehicle travel; and

preventing the brake system from being reconfigured to the control stopped configuration when the detected transmission intended direction of vehicle travel is the first direction of travel.

7. The method of claim 6, wherein detecting the transmission intended direction of vehicle travel includes detecting a forward engaged gear ratio of the transmission.

8. The method of claim 6, wherein detecting the intended direction of vehicle travel includes detecting a reverse engaged gear ratio of the transmission.

9. The method of claim 6, further comprising detecting a transmission neutral, and preventing the brake system from being reconfigured to the control stopped configuration when the transmission is in one of a plurality of neutral positions.

10. The method of claim 6, wherein the brake system stopped configuration includes where a vehicle wheel speed is restricted to within a predetermined tolerance of a predetermined value.

11. The method of claim 6, wherein reconfiguring the brake system to the control stopped configuration is performed as the brake system is manually released.

12. The method of claim 6, further comprising preventing an increase in vehicle wheel speed regardless of operator manipulation of the brake actuator when the brake system is in the control stopped configuration.

13. The method of claim 6, further comprising:

detecting a shift from a gear engaged position to at least one of a plurality of neutral positions in a transmission system;

maintaining the brake system in the control stopped configuration where a vehicle wheel speed is restricted to within a predetermined tolerance of a predetermined value; and

reconfiguring the brake system from the control stopped configuration to a released configuration, where the brake system will not generally inhibit rotation of at least one vehicle road wheel, when a predetermined amount of time has elapsed after the shift from the gear engaged position to the neutral position.

14. The method of claim 13, further comprising maintaining the brake system in the control stopped configuration as the brake system is manually released when the detected transmission intended direction of vehicle travel is not the first direction of vehicle travel.

15. The method of claim 13, further comprising detecting a transmission neutral, and preventing the brake system from being reconfigured to the control stopped configuration when the transmission is in one of the plurality of neutral positions.

16. The method of claim 13, further comprising preventing rotation of the at least one vehicle road wheel regardless of operator manipulation of the brake actuator when the brake system is in the control stopped configuration.