Anti-spinning device for automobiles

Claim 1

An anti-spin device for a motor vehicle having driven and non-driven wheels and an ignition system including a contact breaker producing an original breaker signal, said device comprising a sensor for at least one driven wheel and a sensor for at least one non-driven wheel, each of said sensors producing electrical pulses proportional in number to the peripheral distance covered by said wheel, the sensor of said driven wheel generating a lower number of pulses than the sensor of the non-driven wheel for a same peripheral distance covered thereby, at least one up/down counter, said driven wheel pulses being received at the up input of said counter and said non-driven wheel pulses being received at the down input of said counter, a shift register receiving said original breaker signal, a clock released by said original signal and controlling said shift register to produce a plurality of sequentially increasing retarded breaker signals at respective outputs, a multiplexer having a plurality of channels connected to said shift register outputs respectively and an output connected to the remainder of said ignition system, and a channel selector circuit controlled by said counter either to select said original breaker signal for said multiplexer output when said up counted pulses do not exceed said down counted pulses by more than a predetermined amount or to select one of said retarded breaker signals when said up counted pulses exceed said down counted pulses by more than said predetermined amount, the retarded breaker signal selected being dependent on the amount of excess whereby the engine torque and therefore said spin is reduced.