Operating a multimode ABS

• US 20040254711A1
• Filed: 06/16/2003
• Published: 12/16/2004
• Est. Priority Date: 06/16/2003
• Status: Active Grant

• Current Assignee: BMW AG (Bayerische Motoren Werke AG), BWI Company Limited SA (Shougang Corporation)
• Original Assignee: Delphi Technologies, Inc. (Aptiv PLC)
• Inventors: Smakman, Hendrikus T., Zumberge, Jon T., Buckholtz, Kenneth R.
• Granted Patent: US 7,013,209 B2
• Time in Patent Office: Days
• US Class Current: 701/76
• CPC Class Codes: B60T 2270/416 Wheel speed sensor failure
• CPC Class Codes: B60T 8/885 using electrical circuitry

Abstract

A method of operating a vehicle anti-lock brake system is disclosed. The method includes determining an ABS failure condition has occurred, configuring a failure condition operating mode of the ABS control and, finally, activating the ABS control based on the failure condition operational mode. A computer readable medium storing a computer program for operating a vehicle ABS control is also described. Computer readable code for determining that an ABS failure condition has occurred, configuring a failure condition operating mode of the ABS control, and then activating the ABS based on the failure condition operational mode is described. A vehicle including an anti-lock brake system configured for operation when a failure condition occurs is described. Operating the anti-lock brake system comprises determining an ABS failure condition has occurred, configuring a failure condition operating mode of the ABS, and activating the ABS based on the failure condition operational mode.

Claims

1. A method for operating a vehicle anti-lock brake system comprising:

determining an ABS failure condition has occurred;

configuring a failure condition operating mode of the anti-lock brake system responsive to the failure condition determination; and

activating the anti-lock brake system based on the failure condition operating mode.

2. The method of claim 1, wherein determining a failure condition comprises:

determining a brake actuator failure at a wheel of a vehicle and

wherein configuring the failure condition operating mode comprises configuring an ABS control for operation excluding the wheel having a failed brake actuator.

3. The method of claim 2, wherein the failure condition operating mode for a rear wheel brake actuator failure comprises:

producing a normal-mode ABS command for each front vehicle wheel; and

producing a failure-mode ABS command for each remaining rear wheel based on vehicle data available to the ABS control.

4. The method of claim 2, wherein the failure condition operating mode is configured for a front wheel actuator failure comprising:

producing a normal-mode ABS command for each remaining vehicle wheel.

5. The method of claim 2, further comprising:

determining if wheel speed data is available for the wheel having the brake actuator failure;

receiving the wheel speed data responsive to determining the wheel speed is available; and

utilizing the wheel speed data for calculation of the vehicle speed.

6. The method of claim 1, wherein determining a failure condition comprises determining an invalid wheel speed indicator at a wheel of a vehicle and wherein configuring the failure condition operating mode comprises configuring an ABS control for operation without wheel speed data from the invalid wheel speed indicator.

7. The method of claim 6, wherein the failure condition operating mode for a rear wheel speed indicator failure comprises:

producing a rear wheel speed indicator failure command for the wheel with the invalid wheel speed sensor;

producing a normal-mode ABS command for each front vehicle wheel; and

producing a failure-mode ABS command for each remaining rear wheel based on vehicle data available to the ABS control.

8. The method of claim 6, wherein the failure condition operating mode is configured for a front wheel speed indicator failure comprising:

producing a normal-mode ABS command for each vehicle wheel except the wheel having a speed indicator failure; and

producing a front wheel speed indicator failure command for the wheel having the speed indicator failure based on vehicle data available to the ABS control.

9. The vehicle of claim 8, wherein the front wheel speed indicator failure command comprises a command to apply the minimum of a rear brake command.

10. A computer readable medium storing a computer program comprising:

computer readable code for determining an ABS failure condition has occurred;

computer readable code for configuring a failure condition operating mode of the anti-lock brake system responsive to the failure condition determination; and

computer readable code for activating the anti-lock brake system based on the failure condition operating mode.

11. The computer readable code of claim 10, wherein determining a failure condition comprises determining a brake actuator failure at a wheel of a vehicle and wherein configuring the failure condition operating mode comprises configuring an ABS control for operation excluding the wheel having a failed brake actuator.

12. The computer readable code of claim 11, wherein the failure condition operating mode for a rear wheel brake actuator failure comprises:

computer readable code for producing a normal-mode ABS command for each front vehicle wheel; and

computer readable code for producing a failure-mode ABS command for each remaining rear wheel based on vehicle data available to the ABS control.

14. The computer readable medium of claim 11, further comprising:

computer readable code for determining if wheel speed data is available for the wheel having the brake actuator failure;

computer readable code for receiving the wheel speed data responsive to determining the wheel speed is available; and

computer readable code for utilizing the wheel speed to calculate vehicle speed.

15. The computer readable code of claim 10, wherein determining a failure condition comprises determining an invalid wheel speed indicator at a wheel of a vehicle and wherein configuring the failure condition operating mode comprises configuring the ABS control for operation without wheel speed data from the invalid wheel speed indicator.

16. The computer readable code of claim of claim 15, wherein the failure condition operating mode for a rear wheel speed indicator failure comprises:

computer readable code for producing a rear wheel speed indicator failure command for the wheel with the invalid speed sensor;

computer readable code for producing a normal-mode ABS command for each front vehicle wheel; and

computer readable code for producing a failure-mode ABS command for each remaining rear wheel based on vehicle data available to the ABS control.

17. The computer readable code of claim of claim 15, wherein the failure condition operating mode is configured for a front wheel speed indicator failure comprising:

computer readable code for producing a normal-mode ABS command for each vehicle wheel except the wheel having a speed indicator failure; and

computer readable code for producing a front wheel speed indicator failure command for the wheel having the speed indicator failure based on vehicle data available to the ABS control.

18. The computer readable code of claim 17, wherein the failure condition operating mode is configured for a front wheel actuator failure comprising:

computer readable code for producing a normal-mode ABS command for each remaining vehicle wheel.

13. The computer readable code of claim I 1, for wherein the failure condition operating mode is configured for a front wheel actuator failure comprising:

computer readable code for producing a normal-mode ABS command for each remaining vehicle wheel.

19. A vehicle including:

an anti-lock brake system; and

means for operating the anti-lock brake system when a failure condition occurs in the anti-lock brake system;

wherein operating the anti-lock brake system comprises determining an ABS failure condition has occurred, configuring a failure condition operating mode of the anti-lock brake system responsive to the failure condition determination, and activating the anti-lock brake system based on the failure condition operating mode.