Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1988-10-25
1991-01-22
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
180197, 303111, 303119, B60T 832
Patent
active
049866125
ABSTRACT:
A brake fluid pressure control apparatus for a vehicle includes a fluid pressure control valve device arranged between a master cylinder and a wheel cylinder, receiving control signals from a control unit measuring the skid condition of the wheel to control the brake fluid pressure to the wheel cylinder. A hydraulic reservoir stores the brake fluid discharged through the fluid pressure control valve device from the wheel cylinder and a pressure fluid supply conduit connects the master cylinder with the fluid pressure control valve device. A fluid pump returns the brake fluid from the hydraulic reservoir into the pressure fluid supply conduit and a valve apparatus is arranged in a conduit connecting the discharge side of the fluid pump with the master cylinder side, in the pressure fluid supply conduit. The valve apparatus takes a first position connecting both sides and a second position that cuts off the fluid flow from the discharging side of the fluid pump toward the master cylinder side. The valve apparatus is normally in the first position. During anti-skid control, it takes the first position continuously for a certain time depending on the control time of the fluid pressure decrease and continuously for another certain time depending on the control time if the fluid pressure is increased after the fluid pressure decrease, and it takes the second position continously for times other than the certain time and/or the other certain time. Alternatively, it cycles between the first and second position for a certain time depending on the control time of the fluid pressure decrease and/or for another certain time depending on the control time of increasing again the fluid pressure after the fluid pressure decrease, and it takes the second position for times other than the certain time and/or the another certain time.
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Graham Matthew C.
Nippon A B S Ltd.
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