Wabco Westinghouse Fahrzeugbremsen Gmbh

Wabco Fahrzeugbremsen Gmbh

Wabco Vermogensverwaltungs Gmbh

Manfred Saba

Klaus Lindemann

Gerhard Ruhnau

Erwin Petersen

Wolfgang Gudat

Hans Holst

Henrich Riedemann

Ulrich Weihe

Axel Gieseler

Hans-Harald Kaess

Johannes Moller

A process for the verification of an antilock braking system (ABS) in a vehicle to check for correct connection of the component wheel sensors (3, 4, 17, 18, 19, 20), braking pressure modulators (7, 9, 12), and brake cylinders (5, 6, 10, 11, 13, 14) is proposed. The method can be used in a new installation of the ABS or when resuming operation after repair of the system. In a first step, the user causes a single sensed wheel to rotate. This actuates a testing mode in the ABS electronic controller (8). The electronic controller (8) then actuates the modulator belonging to the rotated wheel. From the response of the sensed wheel and/or the actuated modulator, the user recognizes whether the matching between the sensor of the rotated wheel and the actuated modulator is correct. This procedure is then repeated with the other sensed wheels.

Method for the verification of electrical connections for an antilock

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.

Anti-lock brake system for vehicles

A circuit arrangement for influencing the brake pressure venting phase and/or brake pressure retaining phase for an antiskid vehicle braking system when the measured velocity difference deviates from a given velocity difference during controlled braking. The velocity change is determined as a function of the wheel tendency or tendencies by measuring and differentiating the velocity value or values at the interval boundaries of an assigned time .DELTA.t of the control signals or by the assigned times of the control signals. A switching circuit, to which the brake pressure control signals, such as, the acceleration +b, deceleration -b and slip .lambda. control signals, and a signal representing the wheel tendencies, such as, either positive or negative velocity change of the sensed wheel or wheels, can be set upon drop away of a +b or -b signal. The switching circuit controls a shifting circuit which changes the assigned time .DELTA.t or some or all assigned times .DELTA.t or changes the switching times of the control signals as a function of the signal or signals indicating the wheel tendency or tendencies. Thus, the shifting circuit produces a high signal, a medium signal, or a low signal indication representing an appropriate assigned time .DELTA.t.

Circuit for influencing the brake-pressure release and/or brake-pressure

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Ronnenberg, Germany

Manfred Saba