System for controlling or adjusting an electromechanical brake

摘要

There is the problem of adjusting a clearance in electromechanically or electromotively operated brakes because automatic resetting means, which are provided for hydraulic brakes, cannot be used in brakes of the above type.Initially, it is necessary to determine a neutral position of the motor which is defined by the friction elements just abutting the brake disc in this position.This situation is determined by a detection device which exhibits the following operation in one preferred embodiment. The motor is driven from an unknown position by a constant motor torque so that the friction linings are moved towards the brake disc. The motor will speed up because the resistances remain constant in the starting stroke. An abrupt deceleration of the motor will be caused when the friction linings are applied to the brake disc. The zero passage of the angular acceleration can be sensed and interpreted as an application of the friction linings on the brake disc. Subsequently, a so-called contact signal is generated, with the result that the motor is restored in a position-controlled manner by a defined angle which corresponds to the clearance being adjusted.