Teldix Gmbh

Jurgen Gerstenmeier

Heinz Leiber

Wolfgang Korasiak

Hans C Muller

Hermann Klotz

Thomas Morath

An antilocking control system for the wheel brakes of a vehicle, which system includes two identically designed control units for various wheels of the vehicle and with each control unit comprising at least one wheel speed sensor, an evaluation circuit for evaluating the output signals from the sensors and for producing control signals and a brake pressure control unit responsive to the control signals from the evaluation circuit, as well as a device for testing the operability of the antilocking control system at desired time intervals. The testing device, upon receipt of a start instruction, simultaneously feeds at least one identical test signal to each of the two control units, and then compares the effect of the test signal on the two control units by comparing output signals from the two control units at given corresponding points in the two control units for at least approximate coincidence with respect to the timely occurrence and/or the magnitude of the signals and generates a control signal, e.g., to switch-off the antilock control system and/or actuate a warning device, if there is a deviation between the two signals being compared which is greater than a given value.

Testing arrangement for antilocking control system with two identical

In an antilocking control system in which wheel speed is monitored to control a braking operation in a manner to prevent locking of the braked wheels, a tendency of the wheel velocity to decrease more rapidly than a reference rate acts to reduce the brake pressure, and a subsequent tendency of the wheel velocity to increase acts to either hold constant or to gradually increase the brake pressure.

Antilocking control system

An automatic antilock control system for vehicles comprises a sensor which determines the presence of a tendency of a wheel to lock, a brake pressure open loop control device for varying the brake pressure at the said wheel and controlled by an evaluation circuit responsive to the sensor, the evaluation circuit including switch apparatus for producing open loop control signals which achieve a steep brake presence variation during an antilock control operation and thereafter achieve a further slower pressure variation, and open loop control apparatus for varying the duration of the pressure variation in dependence on the duration of the steep pressure variation of the previous cycle.

Automatic antilock control system

A method for the conversion of a constantly occurring measured value in digital form into a filtered digital value comprises comparing the instantaneous measured value with a digital value determined by previous measurements, evaluating the difference .DELTA. of the values in accordance with a predetermined function K = f (.DELTA.) and adding this evaluated value, correct with respect sign, to the said digital value determined by previous measurements. The invention also includes an arrangement suitable for carrying out this method.

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Waldhilsbach, Germany

Jurgen Gerstenmeier