REGLERINGSANORDNING FOR ATT FORHINDRA HJULLASNING VID FORDON

The invention concerns an anti-lock control system for braking vehicle wheels having a pickup element to determine the wheel velocity. An evaluating circuit connected to the output of the pickup element produces control signals for varying the fluid pressure in the braking system if the signals corresponding to the wheel velocities deviate by predetermined threshold values from the signals corresponding to the curve of the vehicle speed. Switching apparatus containing timing elements is provided which respond along the lines of a pressure reduction when the pressure control unit is initiated and then effect, for a short time, a switchover of the control. Furthermore, control signals are produced only in case of deviations by more than the maximum threshold value. Finally, testing apparatus is included which determines, after the threshold value has become effective, when the initiating signal disappears and which then maintains the switchover condition for a predetermined longer period of time.