Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1989-07-19
1990-08-28
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 52, 303114, 303116, 303110, 188345, B60T 832
Patent
active
049520032
ABSTRACT:
There is disclosed an apparatus for controlling brake fluid pressure of a vehicle. A supply valve of the normally closed type is opened only at the time of an anti-lock control so as to supply fluid pressure from an accumulator to a pressure fluid chamber of a master cylinder. An intake valve normally shuts off the communication between the accumulator and the fluid pressure chamber. A valve operating member for movement with a main piston of the master cylinder is engageable with a distal end of the intake valve projecting into the fluid pressure chamber to open the intake valve when the stroke of the main piston reaches a predetermined value, thereby communicating the fluid pressure chamber with the accumulator. An auxiliary piston is slidably mounted around the main piston so as to urge the main piston to move at the time of the traction control. A fluid pressure within an auxiliary fluid pressure chamber provided around the auxiliary piston acts on the auxiliary piston. An anti-lock valve of the normally open type is provided in a fluid passage, connecting the auxiliary fluid pressure chamber to that portion of a fluid passage extending between the supply valve and the intake valve, so as to be opened only at the time of the anti-lock control. A traction valve of the normally open type is provided in a fluid passage, connecting the auxiliary fluid pressure chamber to a reservoir, so as to be closed only at the time of the traction control.
REFERENCES:
patent: 4416491 (1983-11-01), Belart et al.
patent: 4641895 (1987-02-01), Belart et al.
patent: 4790608 (1988-12-01), Burgdorf et al.
patent: 4805965 (1989-02-01), Jonner et al.
Akebono Brake Industry Co. Ltd.
Akebono Research and Development Centre Ltd.
Butler Douglas C.
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