Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1988-09-26
1990-01-16
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 842, 303111, 303 92, B60T 834, B60T 832
Patent
active
048938815
ABSTRACT:
An anti-lock braking system incorporates a copy valve adapted to ensure that the behaviour of a brake on one rear wheel of a vehicle is copied by the brake on the other rear wheel when an anti-lock situation arises. For example, a single copy valve may be incorporated in the braking circuit for the rear wheels of a vehicle of which the behaviour of the brakes is controlled by a single modulator. In another construction, two such copy valves are incorporated in a twin assembly of a braking system of the `X` split type. In such a construction both rear wheel brakes respond to operation of one of a pair of modulators, each responsive to signals from a speed sensor on a respective front wheel of the vehicle. The or each copy valve incorporates first and second pistons which are relatively movable in response to differential pressures from the pressure spaces of a master cylinder in order to control operation an isolating valve.
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patent: 4733921 (1988-03-01), Farr
Butler Douglas C.
Lucas Industries Public Limited Company
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