Wabco Westinghouse Gmbh

Klaus Lindemann

Erich Reinecke

Lutz Weise

Dieter Luhdorff

Alfred Klatt

An antiskid brake control system in which an electronic evaluation circuit subject to dynamic behavior signals produced by a wheel sensor associated with one wheel of an axle controls modulator valve device in the brake cylinder fluid pressure conduit to adjust the brake cylinder pressure at the sensed wheel as well as at the non-sensed wheel of the axle independently of an operator controlled brake valve device. There is provided in alternate arrangements of the invention an electrical delay element via which either the supply or exhaust valve comprising the modulator valve device associated with the non-sensed wheel is controlled so that the non-sensed wheel brake pressure development is inhibited relative to the sensed wheel brake pressure to provide better stability of the non-sensed wheel. Another arrangement provides an electrical delay element via which the exhaust valve comprising the modulator valve device of the sensed wheel is controlled so as to inhibit the exhaust of brake pressure therefrom while the non-sensed wheel brake pressure is reduced in the usual manner under control of the evaluation device when a wheel skid condition of the sensed wheel is detected. As an alternative to the electrical delay elements in these arrangements, there may be provided a fluid pressure flow restrictor in the appropriate brake cylinder conduit, with the direction of restricted flow being controlled by a one-way check valve.

Vehicle antiskid brake control system having means for adjusting a

A wheel anti-skid brake control system for an automotive type vehicle in which diagonally opposed wheels on different axles of the vehicle are provided with a sensor device whose output signals represent different dynamic wheel behavior conditions. An electro-pneumatic modulator valve is operative in a common line via which fluid pressure is delivered to each brake cylinder device of an axle or in a separate line connected directly to each individual brake cylinder device of the axle to influence the brake pressure delivered to each brake cylinder via an operator's control valve device in accordance with the output signals of the sensor device of one wheel of the axle, as monitored by an evaluation circuit to which the modulator valve or valves of the axle are operatively connected.

Wheel anti-skid brake control system for a road vehicle

An antiskid brake control system for an automotive vehicle of the type having for each wheel signalling apparatus to scan and sense its dynamic behavior characteristics during braking and electronic evaluation circuitry whose output signals operate electro-pneumatic modulator valves to override the operator controlled fluid brake pressure at a respective wheel when the signalling apparatus indicates an impending wheel skid. The invention features a pulse generator for each wheel of a pair of wheels that is cross-connected with the evaluation circuitry of the opposite wheel so as to effect intermittent operation of one wheel modulator valve only when the evaluation circuit of the other wheel indicates an impending wheel skid in the absence of an impending wheel skid condition of the one wheel. The intermittent operation of the one wheel modulator valve effects brake pressure buildup at a slower than normal rate to prevent excessive brake pressure differences from arising sufficient to cause directional instability when the pair of wheels are the vehicle steering wheels. The invention has the advantage of assuring brake pressure buildup at the one wheel, even in the event the indication of an impending wheel skid by the evaluation circuit is due to a malfunction.

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Hanover, Germany

Klaus Lindemann