Cruise control system for motorcars

A cruise control system for keeping a car at a substantially constant distance from a preceding motorcar by a position servo unit which controls a fuel supply means of said car, comprising a pacemaker for producing command pulses to said position servo unit, a means for supplying distance pulses which are proportional to mileage of the car, as feedback pulses, to said position servo unit, an initial value setting means for setting an initial pulse rate for said pacemaker at an instance when a driver judges that a stable constant distance to the preceding motorcar is attained, and a control means for modifying remaining pulses of said pacemaker directly or indirectly at another instance when the driver judges that the distance to the preceding motorcar deviates from said stable constant distance set in a previous operation, said control means for modifying remaining pulses including a reversible cruise control dial arranged interiorly of said car within a driver's reach for adding an additional pace value to said remaining pulses directly or indirectly when said reversible cruise control dial is operated, said remaining pulses being modified directly by adding distance pulses which are proportional to a correction value or indirectly by changing a pulse rate in said pacemaker.