Brake control method and brake control apparatus for motorcycle

• US 20030015916A1
• Filed: 07/16/2002
• Published: 01/23/2003
• Est. Priority Date: 07/19/2001
• Status: Active Grant

• Current Assignee: Bosch Corporation (Robert Bosch GmbH)
• Original Assignee: Bosch Braking Systems Corporation (Robert Bosch GmbH)
• Inventors: Sakamoto, Tadashige
• Granted Patent: US 6,793,295 B2
• Time in Patent Office: Days
• US Class Current: 303/137
• CPC Class Codes: B60T 8/1706 for single-track vehicles, e.g. motorcycles
• CPC Class Codes: B60T 8/261 specially adapted for use in motorcycles
• CPC Class Codes: B60T 8/3225 Systems specially adapted for single-track vehicles, e.g. motorcycles B60T8/3235 takes precedence
• CPC Class Codes: B60T 8/345 having more than one brake circuit per wheel
• CPC Class Codes: B60T 8/4072 Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
• CPC Class Codes: B60T 8/4872 pump-back systems

Abstract

In a brake control method for a motorcycle which includes a front master cylinder, front wheel cylinders hydraulically connectable to the front master cylinder, a rear master cylinder, a rear wheel cylinder means hydraulically connectable to the rear master cylinder and a hydraulic pressure pump, when only the front master cylinder is operated, brake pressure fluid is supplied to the front wheel cylinders, the fluid pressure pump is driven to supply discharging pressure fluid to the rear wheel cylinder and, when only the rear master cylinder is operated, brake pressure fluid is supplied only to the rear wheel cylinder.

Claims

1. In a brake control method for a motorcycle which includes a front master cylinder, front wheel cylinder means hydraulically connectable to said front master cylinder, a rear master cylinder, rear wheel cylinder means hydraulically connectable to said rear master cylinder and a hydraulic pressure pump, the improvement in which, when only said front master cylinder is operated, brake pressure fluid is supplied to said front wheel cylinder means, said hydraulic pressure pump is driven to supply discharging pressure fluid to said rear wheel cylinder means and, when only said rear master cylinder is operated, brake pressure fluid is supplied only to said rear wheel cylinder means.

4. A brake control method for a motorcycle according to any one of claims 1 to 3, in which said hydraulic pressure pump is driven with the detection of the operation of said front master cylinder.

5. A brake control method for a motorcycle according to any one of claims 1 to 4, in which brake fluid pressure of said front wheel cylinder and/or brake fluid pressure of said rear wheel cylinder is or are adjusted for anti-skid control, with electro-magnetic changeover valve means arranged between said front master cylinder and said rear master cylinder, and said front wheel cylinder and said rear wheel cylinder.

6. A brake control method for a motorcycle according to claim 5, in which, with the drive of said hydraulic pressure pump, the brake fluid pressure of said rear wheel cylinder is adjusted for drive slip control or traction control by said electro-magnetic changeover valve means.

7. A brake control method for a motorcycle according to claims 1 to 6, in which power supply to said electro-magnetic changeover valve means is stopped on the detection of the system trouble.

2. In a brake control method for a motorcycle which includes a front master cylinder, one front wheel cylinder hydraulically connectable to said front master cylinder, a rear master cylinder, a rear wheel cylinder hydraulically connectable to said rear master cylinder and another front wheel cylinder hydraulically connectable to said rear master cylinder and a hydraulic pressure pump, the improvement in which, when only said front master cylinder is operated, brake pressure fluid is supplied to said one front wheel cylinder, said fluid pressure pump is driven to supply discharging pressure fluid to said rear wheel cylinder and, when only said rear master cylinder is operated, break pressure fluid is supplied to said rear wheel cylinder and said other front wheel cylinder.

3. A brake control method for a motorcycle according to claim 2, in which said brake pressure fluid is supplied through a delay valve to said other front wheel cylinder.

8. In a brake control apparatus for a motorcycle which includes a first electro-magnetic changeover valve apparatus arranged in a conduit between a front master cylinder and front wheel cylinder means, a second electro-magnetic changeover valve apparatus arranged in a conduit between a rear master cylinder and a rear wheel cylinder, hydraulic reservoir means for reserving brake fluid discharged from said front wheel cylinder means and said rear wheel cylinder, and a hydraulic pressure pump the inlet port side of which is connected to said hydraulic reservoir means and the outlet port side of which is connected to said front master cylinder side and said rear wheel cylinder side, the improvement in which a first association electro-magnetic changeover valve is arranged between said rear master cylinder and said outlet port side of said hydraulic pressure pump, said first association electro-magnetic changeover valve taking normally the communicating state, a second association electro-magnetic changeover valve is arranged between a conduit portion between said rear master cylinder and said first association electro-magnetic changeover valve, and the sucking port side of said hydraulic pressure pump, said second association electro-magnetic changeover valve taking normally the cutout state, and when said front master cylinder is operated, said first association electro-magnetic changeover valve and second association electro-magnetic changeover valve are charged over from the communicating state to the cutout state, and from the cutout state to the communicating state, respectively, and so said hydraulic pressure pump is driven.

9. In a brake control apparatus for a motorcycle which includes a first electro-magnetic changeover valve apparatus arranged between a front master cylinder and one front wheel cylinder, said first electro-magnetic changeover valve apparatus normally making to communicate said front master cylinder with said one front wheel cylinder, and cutting off said one front wheel cylinder from a front hydraulic reservoir, a second electro-magnetic changeover valve apparatus arranged between a rear master cylinder and a rear wheel cylinder, said second electro-magnetic changeover valve apparatus normally making to communicate said rear wheel cylinder with said rear master cylinder, and cutting off said rear wheel cylinder from a rear hydraulic reservoir, and a hydraulic pressure pump the sucking port side of which is connected to said front and rear hydraulic reservoirs, and the discharging port side of which is connected to said rear master cylinder side and to said front master cylinder.

the improvement in which a third electro-magnetic changeover valve apparatus is arranged between said rear master cylinder and another front wheel cylinder different from said one front wheel cylinder, said third electro-magnetic changeover valve apparatus making normally to communicate said different front wheel cylinder with said rear master cylinder, and cutting off said different front wheel cylinder from said rear hydraulic reservoir, a first association electro-magnetic changeover valve is arranged between said rear master cylinder and the outlet port side of said hydraulic pressure pump, said first association electro-magnetic changeover valve taking normally the communicating state, a second association electro-magnetic changeover valve is arranged in a conduit connecting a conduit portion between said rear master cylinder and said first association electro-magnetic changeover valve, with the sucking port side of said hydraulic pressure pump, said second association electro-magnetic changeover valve taking normally the cutoff state, and when said front master cylinder is operated, said first association electro-magnetic changeover valve and said second association electro-magnetic changeover valve are changed over from the communicating state to the cutoff state and from the cutoff state to the communicating state, respectively and said hydraulic pressure pump is driven.

10. A brake control apparatus for a motorcycle according to claim 9, in which said third electro-magnetic changeover valve apparatus consists of an inlet valve and an outlet valve, said inlet valve and said outlet valve taking normally the communicating state and the cutoff state, respectively, and with the energization of the solenoid portions thereof, said inlet valve and outlet valve being changed over into the cutout state and the communicating state respectively, and said inlet valve is connected through a delay valve to said different wheel cylinder.

11. A brake control apparatus for a motorcycle according to any one of claims 8 to 10, in which said hydraulic pressure pump is driven and said first association electro-magnetic changeover valve and said second association electro-magnetic changeover valve are changed over to supply brake fluid to said rear wheel cylinder, with the detection of the operation of said front master cylinder.

12. A brake control apparatus for a motorcycle according to any one of claims 8 to 11, in which brake fluid pressure of said front wheel cylinder and/or of said rear wheel cylinder is or are adjusted for anti-skid control, with said first electro-magnetic changeover valve apparatus and said second electro-magnetic changeover valve apparatus.

13. A brake control apparatus for a motorcycle according to any one of claims 9 to 12, in which brake fluid pressure of said front wheel cylinder or cylinders and/or said rear wheel cylinder is or are adjusted for anti-skid control with said first, second and third electro-magnetic changeover valve apparatus.

14. A break control apparatus for a motorcycle according to any one of claims 8 to 13, in which brake fluid pressure of said rear wheel cylinder is adjusted for drive slip control or traction control, with control of said second electro-magnetic changeover valve apparatus, said first association electro-magnetic changeover valve, second association electro-magnetic changeover valve and with drive of said hydraulic pressure pump.

16. A brake control apparatus for a motorcycle according to claim 15, in which said third electro-magnetic changeover valve apparatus consists of an inlet valve and an outlet valve, said inlet valve and said outlet valve taking normally the cutoff states, respectively, and with the energization of the solenoid portions thereof, said inlet valve and outlet valve being changed over into the communicating states respectively, and said inlet valve is connected through a delay valve to said different wheel cylinder.

17. A brake control apparatus of a motorcycle according to claim 15 or 16, in which, when said rear master cylinder is operated, said third electro-magnetic changeover valve apparatus is changed over to communicate said rear master cylinder with one port of said front wheel cylinder means.

20. A brake control apparatus for a motorcycle according to claims 8 to 19, in which braking forces are electrically distribution-controlled between said front wheel and said rear wheel.

22. A brake control apparatus for a motorcycle according to any one of claims 8 to 21, in which a first fluid pressure detector is arranged for detecting fluid pressure of said rear mater cylinder, and a second fluid pressure detector is arranged for detecting fluid pressure of said rear wheel cylinder, wherein, when said rear master cylinder is voluntarily actuated during the time when brake fluid is sucked from said rear master cylinder with said hydraulic pressure pump, the output of said first fluid pressure detector is compared with the output of said second fluid pressure detector, and when the former output becomes equal to the latter output or almost equal to the latter output, the solenoid portions of said first and second association changeover valves are deenergized.

15. In a brake control apparatus for a motorcycle which includes a first electro-magnetic changeover valve apparatus arranged between a front master cylinder and front wheel cylinder means, said first electro-magnetic changeover valve apparatus making to communicate said front master cylinder with said front wheel cylinder means, and cutting off said front wheel cylinder means from a front hydraulic reservoir, a second electro-magnetic changeover valve apparatus arranged between said rear master cylinder and said rear wheel cylinder, said second electro-magnetic changeover valve apparatus making to communicate a rear wheel cylinder with said rear master cylinder, and cutting off said rear wheel cylinder from a rear hydraulic reservoir, and a hydraulic pressure pump the sucking port side of which is connected to said front and rear hydraulic reservoirs, and the discharging port side of which is connected to said rear master cylinder side and to said front master cylinder side, the improvement in which a third electro-magnetic changeover valve apparatus is arranged between said rear master cylinder and said front wheel cylinder means, said third electro-magnetic changeover valve apparatus normally cutting off said front wheel cylinder means from said rear master cylinder, and cutting off said front wheel cylinder means from said rear hydraulic reservoir, a first association electro-magnetic changeover valve is arranged between said rear master cylinder and the discharging port side of said hydraulic pressure pump, said first association electro-magnetic changeover valve taking normally the communicating state, a second association electro-magnetic changeover valve is arranged in a conduit connecting the conduit portion between said rear master cylinder and said first association electro-magnetic changeover valve, with the sucking port side of said hydraulic pressure pump, said second association electro-magnetic changeover valve taking normally the cutoff state, and when said front master cylinder is operated, said first association electro-magnetic changeover valve and said association electro-magnetic changeover valve are changed over from the communicating state to the cutoff state and from the cutoff state to the communicating state, respectively and said hydraulic pressure pump means is driven.

18. A brake control apparatus for a motorcycle according to any one of claims 15 to 17, in which said front wheel means and/or said rear wheel are antiskid-controlled with the control of said first, second and third electro-magnetic changeover valve apparatus.

19. A brake control apparatus for a motorcycle according to any one of claims 15 to 18, in which the drive-slip or traction of said rear wheel is controlled with the control of said second electro-magnetic changeover valve apparatus and first association electro-magnetic changeover valve and second association electro-magnetic changeover valve, with the drive of said hydraulic pressure pump.

21. A brake control apparatus for a motorcycle according to any one of claims 15 to 20, in which power supply to said first, second and third electro-magnetic changeover valve apparatus and to said first association electro-magnetic changeover valve and second association electro-magnetic changeover valve is cut off on the trouble of the apparatus system.