Method and apparatus for testing of brakes on a brake test rig for motor vehicles

摘要

A method is described for testing brakes on brake test stands or rigs for motor vehicles with a plurality of motor-driven axles, wherein the axle of the brake to be tested is not de-couplable. Both wheels of this axle stand on rollers or the like on the rig and, during the test procedure, are driven in opposite directions. During the test the speed of rotation of both wheels is measured and is maintained equal by means of a control operation regulated by the result of the measurement. Apparatus is described which includes devices, such as contact rollers, which measure the speed of rotation but are separate from the devices for driving the wheels. In the event of differences being detected between the measured rotational speed and the rotation speed of the other wheel a controller adjusts the rotational speed of one or both wheels. It is especially favorable if, on the wheels of the axle of the brake to be tested, a mark is secured which co-operates with a path or position recorder. In particular, the mark is advantageously formed as a reflector which directs a light impulse to a sensor.