Electronic fuel control system including electronic means for providing

Abstract

An electronic fuel control system of the type providing fuel delivery controlling signals during the period of time that at least a portion of a controlled signal maintains a preselected relationship with respect to particular value is provided with circuit means for continuously providing a variable correction factor. The injection controlling signal is produced by generating a time varying voltage which varies in a predetermined fashion following the occurrence of a triggering event. The generated voltage signal has a first or correction portion and a second or injection controlling portion. The magnitude of the first portion is modulated as a function of the time elapsed from the most recently to have occurred triggering event to provide accurate information to controllably affect fuel delivery. The circuitry of the present invention provides a plurality of voltage level establishing means which may be sequentially operable to establish a maximum charge on the timing capacitor and further includes controllable energy discharge means to vary the control charge from a higher to a lower value. In addition, further switching means are illustrated to controllably sequence the application of the circuitry of the present invention between selected ones of a plurality of timing capacitors which are to be sequentially operated.