Two-channel anti-lock brake system for a two-wheel motor vehicle

• US 5,244,257 A
• Filed: 03/27/1992
• Issued: 09/14/1993
• Est. Priority Date: 09/29/1989
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Muller, Werner, Muller, Elmar
• Primary Examiner(s): Butler, Douglas C.
• Application Number:
  US07/844,572
• Time in Patent Office: 536 Days
• Field of Search: 303/92, 303/100, 303/102, 303/103, 303/105, 303/106, 303/97, 303/99, 364/426.01, 364/426.02, 73/121, 340/453, 188/181 A, 188/181 C
• US Class Current: 303/137
• CPC Class Codes: B60T 8/1706 for single-track vehicles, e.g. motorcycles

Abstract

A motorcycle anti-lock brake system reacts to the appearance of a fault in one of the two control channels before or during a braking procedure on both wheels. The motorcycle anti-lock brake system is formed so that a limited anti-lock brake system function is initially maintained and the anti-lock brake system is not completely switched off until later.

Claims

1. A braking device for a two-wheel motor vehicle, comprising separately actuatable brakes for both wheels of a two-wheel motor vehicle;

and a two-channel anti-lock brake system for both wheels, switchable off when faults appear, said system being formed so that when both wheels are being braked simultaneously and a fault occurs in one channel, a limited anti-lock brake system function is retained in form of a normal closed-loop control using an intact channel and a pressure introduction at a brake of a defective channel until a certain vehicle deceleration is reached, and the system is only switched off when the vehicle comes to rest or when the system closed-loop control operation ends.

2. A braking device as defined in claim 1, wherein said system is formed so that when one vehicle wheel is being braked and a fault appears in the other channel, the closed-loop control at the brake of the intact control channel is retained until the vehicle comes to rest or until the closed-loop control operation ends, and the system is then switched off.

3. A braking device as defined in claim 1, wherein said system is formed so that when one vehicle wheel is being braked and a fault appears in an associated channel, a brake pressure is introduced at said channel until a specified vehicle deceleration is achieved, and the system is only switched off when the vehicle comes to rest or the closed-loop control operation ends.

4. A braking device as defined in claim 1, wherein said system is formed so that when the vehicle is moving without the brakes being operated and a fault appears in one channel, the system is switched off after a warning period.

5. A braking device as defined in claim 1;

and further comprising means for generating a pulsed warning signal from a recognition of a fault to a final switching off of the system, and then after that generating a continuous warning signal.

6. A braking device as defined in claim 1;

and further comprising a rotational speed sensor whose failure constitutes the fault.

7. A braking device as defined in claim 1, wherein said system is formed so that in the case of the failure of a brake pressure control valve in the absence of closed-loop control operation the system is switched off after a warning period.

8. A braking device as defined in claim 1, wherein said system is formed so that in the case of the failure of a hydraulic pump in the absence of closed-loop control operation the system is switched off after a warning period.

9. A braking device as defined in claim 1, wherein said system is formed so that in the case of a brake in a conductor of a brake light switch in the absence of closed-loop control operation the system is switched off after a warning period.

10. A braking device as defined in claim 1, wherein said system is formed so that in the case of an appearance of the switch fault at a hydraulic reservoir in the absence of closed-loop control operation the system is switched off after a warning period.

11. A braking device as defined in claim 1, wherein said system is formed so that in the case of a failure of a brake pressure control valve during a closed-loop control procedure a function of the system is maintained on the other wheel until an end of the closed-loop control procedure.

12. A braking device as defined in claim 1, wherein said system is formed so that in the case of a failure of a brake pressure control valve during a closed-loop control procedure a function of the system is maintained on the other wheel until the vehicle comes to rest.

13. A braking device as defined in claim 1, wherein said system is formed so that in the case of a failure of a hydraulic pump during a closed loop control operation the system is only switched off after an end of the closed-loop control operation.

14. A braking device as defined in claim 1, wherein said system is formed so that in the case of a failure of a hydraulic pump during a closed loop control operation the system is only switched off after the vehicle has to rest.

15. A braking device as defined in claim 1, wherein said system is formed so that in the case of an appearance of a low voltage during a closed loop control operation the system is only switched off after an end of the closed-loop control operation.

16. A braking device as defined in claim 1, wherein said system is formed so that in the case of an appearance of a low voltage during a closed loop control operation the system is only switched off after the vehicle has come to rest.

17. A braking device as defined in claim 1, wherein said system is formed so that in the case of a brake in a conductor of a brake light switch during a closed loop control operation the system is only switched off after an end of the closed-loop control operation.

18. A braking device as defined in claim 1, wherein said system is formed so that in the case of a brake in a conductor of a brake light switch during a closed loop control operation the system is only switched off after the vehicle has come to rest.

19. A braking device as defined in claim 1, wherein said system is formed so that in the case of switch fault of a hydraulic reservoir during a closed loop control operation the system is only switched off after an end of the closed-loop control operation.

20. A braking device as defined in claim 1, wherein said system is formed so that in the case of switch fault of a hydraulic reservoir during a closed loop control operation the system is only switched off after the vehicle has come rest.

21. A method of braking wheels of a two-wheel motor vehicle with two separately actuatable brakes and with a two-channel anti-lock brake system for both wheels, comprising the steps of switching the anti-lock brake system off when faults appear so that, when both wheels are being braked simultaneously and a fault occurs in one channel, a limited anti-lock brake system function is retained in form of a normal closed loop control using an intact channel and a pressure introduction at a brake of a defective channel until a certain vehicle deceleration is reached;

and switching off the anti-lock brake system only when the vehicle comes to rest or when the anti-lock brake system closed-loop control operation ends.