Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1991-06-28
1992-10-06
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188162, 303DIG6, 303119R, 303 68, 303113SS, B60T 832
Patent
active
051525887
ABSTRACT:
An anti-lock braking system (ABS) for a vehicle is provided which in a preferred embodiment includes a controller for signalling the system to an ABS mode, a master cylinder for supplying fluid, an actuator having a bore with a first port connecting the bore with the master cylinder and a second port spaced from the first port connecting the bore with a brake, a first check valve separating the bore into a first chamber exposed to the first port and a second chamber exposed to the second port, and an orifice restricting flow between the brake and the master cylinder via the first and second chambers. A piston is mounted in the second chamber, the piston in a fully actuated position open the first check valve. A threaded driver translates the piston and is powered by a motor. A parallel path connects the master cylinder with the brake parallel to the first and second chambers of the actuator. A solenoid valve within the parallel path is governed by the controller for isolating the master cylinder from the brake when the system is in an ABS mode of operation. A second check valve allows fluid flow from the brake to the master cylinder when pressure within the master cylinder is lower than pressure within the brake.
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Bright James A.
Stradling David A.
Butler Douglas C.
General Motors Corporation
Helms Ernest E.
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