Control system providing a variable impulse-like brake release and/or reapplication signal for wheel slip control

An anti-wheel skid brake control system for a vehicle comprising:

• a signaling means for evaluating the dynamic behavior of a wheel of said vehicle and providing brake pressure release and reapplication signals when certain chosen conditions of wheel rotation have been detected;
• b valve means for controlling modulation of fluid brake pressure;
• and
• c control circuit means for providing an impulselike control signal to effect intermittent operation of said valve means in response to either one of said release and reapplication signals being provided, said control circuit means comprising:
• i a pulse generator for emitting a predetermined impulse frequency;
• ii a digital counter driven in accordance with the impulse frequency of said pulse generator;
• and
• iii decoding means for interrogating the output of said digital counter and emitting said impulse-like control signal so as to vary the duration of respective pulses of said control signal according to different pulse ranges of said impulse frequency, said control signal being characterized by a waveform displaying a predetermined irregular pulse pattern.