Wabco Westinghouse Fahrzeugbremsen Gmbh

Hans-Harald Kaess

Erwin Petersen

Klaus Lindemann

Hans Holst

Manfred Saba

An anti-lock brake system for vehicles with an electronic system which regulates the braking pressure of a monitored wheel as a function of the wheel speed, so that locking is prevented. The system is designed so that each wheel has its own speed sensor, and both wheels of one axle are pressurized with pressure medium by means of a joint control valve controlled by the electronic system. This arrangement corresponds to that of a select-low regulation. To shorten the extended braking distance on roads with different traction on each side, which occurs with a select-low regulation, the control system is designed so that when a retard signal (-b) occurs, the electronic system does not switch as usual to 'remove pressure', but, at least until the occurrence of a slip signal (.lambda.), the control valve is switched to the 'maintain pressure' position.

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Isernhagen, Germany

Hans-Harald Kaess