Brake control method and apparatus

Claim 1

An anti-skid system for a vehicle wheel comprising a source of pressure, a wheel brake, valve means for interconnecting said pressure source and said brake to control the application and release of said brake, an electronic device for controlling said means comprising a speed detector for delivering a first signal corresponding to the angular speed of the wheel, a circuit receiving said first signal for delivering a further signal corresponding to the acceleration or deceleration of the wheel, a threshold circuit for producing a pulse when said signal exceeds a predetermined value, a flip-flop circuit energized by said pulse for energizing a power circuit for controlling said valve means, an accelerometer for producing a third signal corresponding to the acceleration or deceleration of the vehicle, a processing circuit having a first input for receiving said first signal and a second input for receiving said third signal, a condenser between said first input and ground, a transistor with a grounded base conNected between said first and second input and a control circuit for controlling the operation of said processing circuit upon receiving said pulse in a comparing circuit connected between said processing circuit and said flipflop circuit for comparing the output of said processing circuit and said first signal for producing a flip-flop de-energizing signal when said two signals applied to the comparing circuit are equal.