Wabco Westinghouse Gmbh

Dieter Luhdorff

Lutz Weise

Erich Reinecke

Klaus Lindemann

Alfred Klatt

Hugo Jaworsky

Bernd Oehlerking

Klaus-P Simon

Lindemann

Gerhard Koth

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.

Individual wheel antiskid brake control system arranged to prevent

A vehicle antiskid brake control system in which a low threshold acceleration signal is formed in addition to the normal acceleration signal to withhold the reapplication of brake pressure an extended duration following a wheel skid correction to allow sufficient time for an accelerating wheel to reach substantial synchronous speed before braking is resumed when running on a roadway affording such a poor adhesion characteristic as to preclude attainment of a normal rate of wheel acceleration. On a roadway affording a good adhesion characteristic the low threshold acceleration signal is automatically prevented from influencing the antiskid system and the reapplication of brake pressure is instead influenced according to the normal acceleration signal.

Antiskid brake control system affording acceleration control of a

An anti-wheel skid brake control system including a control circuit for providing an impulse-like control current in accordance with which electro-magnetic control valves are operated to either release or reapply brake pressure in an intermittent fashion. The impulse-like control current displays a predetermined pulse form that may vary in duration and interval with different stages of a digital counter whose output is continuously monitored by a decoding logic network. The variable, impulse-like control current provides for a gradual change in the brake pressure during the final stage of brake release or reapplication during a wheel skid to accordingly avoid overshooting of the brake release or reapplication pressure.

Control system providing a variable impulse-like brake release and/or

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Hannover, Germany

Dieter Luhdorff