Fluid-pressure and analogous brake systems – Pipeless valves
Patent
1987-09-04
1989-04-25
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Pipeless valves
303114, 303119, 303DIG4, 73121, 340452, B60T 888, B60T 1722
Patent
active
048241822
ABSTRACT:
An anti-lock hydraulic brake system which includes a brake pressure generator composed of a master cylinder, a brake power booster inserted upstream thereof and a pressure modulator interposed between the master cylinder and the brake power booster. A resetting unit is formed by supplementing the pressure modulator with a valve assembly which connects a resetting chamber of the pressure modulator to either a pressure-compensating reservoir or an auxiliary-pressure source. The braking pressure in the wheel brakes is controlled, according to a time-multiplex method, by wheel valves inserted into the pressure-fluid conduits and by the pressure modulator. In order to check the operability of the brake and of the anti-lock control system, a pressure switch is connected to the pressure modulator and a test circuit is provided which, at predetermined points of time, initiates a test cycle, actuates the valves and compares the valves' operation with the reaction of the pressure switch.
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Batistic Ivica
Buschmann Gunther
David Anton
Determann Otto
Graeber Johannes
Alfred Teves GmbH
Butler Douglas C.
Raden James B.
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