Device for monitoring the slip on wheels of motor vehicles

摘要

The device is intended to give the vehicle driver an alarm signal when the slip state of individual wheels of the motor vehicle becomes critical, but is not intended to signal non-critical slip states. For this purpose each wheel is provided with a sensor unit which emits one sensor pulse per wheel revolution. A counter provided for each wheel and counting count pulses between two sensor pulses is controlled by the sensor pulses by means of a start/stop device. By means of a computing circuit for each wheel a wheel speed signal is formed from each count value. A wheel acceleration signal is produced from two successive count values. The computing circuit is set up to compare the acceleration signal from each wheel with a predetermined deceleration threshold. In addition the computing circuit is also set up to compare the acceleration signals of all wheels with one another and also to compare the greatest difference between two acceleration signals thus calculated with a predetermined deceleration difference threshold. In addition the computing circuit is set up to compare the speed signals of all wheels with one another and designed to further compare the greatest difference between two speed signals thus calculated with a speed difference threshold predetermined as a function of the vehicle speed. An alarm device, which emits an alarm if one of the said thresholds is exceeded, is connected to the computing circuit.