Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1991-09-26
1993-01-12
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 61, 303110, 3031161, 3031191, B60T 832
Patent
active
051784408
ABSTRACT:
When skidding of a wheel is detected at braking of the wheel, a passage changeover valve is changed over to allow a brake fluid within a brake cylinder to escape to a low-pressure accumulator, thereby reducing the pressure within the brake cylinder. In addition, by driving a pump, the brake fluid, which has accumulated in the low-pressure accumulator, is fed under pressure to circulate this brake fluid to a brake fluid passage between the master cylinder and the passage changeover valve. When wheel velocity recovers a predetermined amount, the passage changeover valve is changed over, thereby supplying the brake fluid from the pump to the brake cylinder so as to increase the pressure of the brake cylinder again. When the wheel velocity of the braked wheel has recovered to a predetermined wheel velocity, brake hydraulic pressure is generated a predetermined number of times in pulsed fashion, after which the brake hydraulic pressure is increased again. As a result, the brake pedal can be caused to move slowly, and the amount of brake-pedal movement can be reduced, even when the vehicle is traveling on a road surface having a low coefficient of friction (a low .mu.).
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Kushiyama Takashi
Sugawara Ryuta
Yagi Isao
Butler Douglas C.
Jidosha Kiki Co. Ltd.
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