Speed responsive electronic controls for transmissions

Claim 1

A remote control system for controlling the operation of a vehicle transmission including an input shaft operatively connected to a power source and an output shaft operatively connected to the vehicle drive wheels, comprising first sensing means for sensing the rotational speed of said input shaft and producing a first series of pulses in accordance therewith; second sensing means for sensing the rotational speed of said output shaft and producing a second series of pulses in accordance therewith; and control means for producing a control signal when the ratio of the frequencies of said first and second series of pulses is either above or below a selected value, said control means including first and second n-bit binary ring counters which are connected to said first and second sensing means, respectively, and which are fed respectively with the first and second series of pulses, one of the counters directly controlling starting, stopping and return to zero of the other counter such that a signal representative of the actual value of said ratio is obtained in binary form; and a decoder means connected to said other counter for receiving said actual value signal, said control signal being derived from the output of the decoder means.