Anti-skid device for a motor vehicle braking system

In a motor vehicle braking system, an anti-skid device of the kind which operates to release brakes of the vehicle when at least one wheel reaches a predetermined slipping threshold, the said device having detectors for detecting the speed of rotation of the wheels on at least one axle,

• wherein the improvement consists in said device including:
• upper value comparator means for detecting the greater of the signals from said detectors and producing output signals representative thereof;
• lower value comparator means for detecting the lesser of the signals from said detectors and producing output signals representative thereof;
• an equality comparator circuit having an input connected to said lower value comparator means;
• integrating memory means having an input connected to said upper value comparator means and an output connected to an input of said equality comparator circuit;
• first signal attenuating means connected between said memory means and said upper value comparator means for attenuating a said output signal of said upper value comparator by a predetermined percentage;
• a decelerometer mounted on said vehicle and second signal attenuating means connected to the output of said decelerometer and to an input of said memory means which receives an output signal from said decelerometer attenuated by said second signal attenuating means said output signal of said decelerometer being attenuated by the same percentage as the signal from said upper value comparator means,
• whereby said equality comparator circuit produces an output signal when a signal from said lower value comparator falls to a value equal to a signal from said memory means indicating that a said wheel has reached said predetermined threshold of slipping.