Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1997-09-12
1999-07-06
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303900, 303901, B60T 832
Patent
active
059189509
ABSTRACT:
First and second directional control valves are respectively structured by directional control valves which are operable when skids occur in a wheel and are switchable to only a communication position or to an interrupting position, which enhances switching speed and anti-skid control speed. One end of a main fluid passage is coupled to a wheel cylinder by way of a second directional control valve which is switchable to a communication position or to an interrupting position, and is normally positioned at the communication position. One end of a pressure reduction fluid passage is coupled to the wheel cylinder by way of a first directional control valve which is switchable to a communication position or to an interrupting position, and is normally positioned at the interrupting position. The other end of the main fluid passage is coupled to the fluid pressure generating unit and the other end of the pressure reduction fluid passage is coupled to the main fluid passage detouring around the second directional control valve. A first accumulator, a fluid pressure pump and a second accumulator are provided on the pressure reduction fluid passage wherein the first accumulator can be reduced by operating the fluid pressure pump.
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