Abstract: Timer means for sequential fuel injection including a timer circuit triggered to develop an output signal after a time interval having a duration which varies as a linear function of the magnitude of one or more control voltages varied in accordance with operating parameters, one control voltage being preferably a conditioned speed signal and a second being preferably a conditioned intake manifold pressure signal. The voltage across capacitor means is varied as a linear function of a control voltage, using either a Miller ramp circuit or using a transistorized current sink and is applied to a triggering circuit in the form of a Schmitt trigger circuit or a dual input operation amplifier.

Abstract: Computer means for sequential fuel injection including coupling means for applying manifold pressure and speed signals to control fuel injection time in accordance with the product of the signals, at least one of the coupling means including conditioning means having a predetermined non-linear characteristic. In one embodiment, conditioning means having non-linear characteristics are included in both the pressure and speed signal coupling means and each comprises operational amplifier and diode blocking means operative to provide two break point, three slope characteristics. In another, the conditioning means is included in the pressure signal coupling means and a biasing circuit responds to the speed signal to bias the fuel injection time.