Throttle angle transducers

Claim 1

A throttle angle transducer which can be used in a fuel injection system for a vehicle having a throttle pedal, and which has a nonlinear output which changes more rapidly at small throttle angles than at large throttle angles, said transducer comprising in combination a linear potentiometer having movable thereon a slider which is driven by the throttle pedal which determines said throttle angle, an oscillator, means coupling said oscillator to said slider, said potentiometer determining the period of said oscillator, whereby said period varies linearly with the position of said slider, and an output stage coupled to said oscillator, said output stage providing an output signal which varies linearly with the frequency of the oscillator, the frequency of said oscillator being determined solely by its period, said output stage effecting digital measurement of said oscillator frequency and including means comprising a digital counting device for counting to a value representing the oscillator frequency at any given instance, the shape of the frequency against the throttle angle curve being determined by the output of means for subtracting a fixed digital number from Each digital count.