Electric control apparatus for internal combustion engines

Abstract

Electric control apparatus for providing an enabling control signal and a steering control signal to control the electronic fuel injectors of a sequential fuel injection system of an internal combustion engine is disclosed. The apparatus includes a rotatable disc which rotates in synchronism with the engine. The disc has a plurality of spaced sensible elements contained thereon, one of the sensible elements defining a reference element which has a recognizable characteristic distinguishing it from the other sensible elements. The distance between the reference element and an adjacent element defines a predetermined distance different than the distance between any two adjacent nonreference elements. A single sensor senses the spaced sensible elements and provides corresponding electrical pulses. A pulse processing circuit electrically connected to the output of the sensor processes the pulses. A comparing circuit of the pulse processing circuit compares the period of time a particular pulse is present within a variable time period with the variable time period. A comparing circuit of the pulse processing circuit provides an indication signal to indicate the presence of a reference pulse corresponding to the reference element within the selected variable time period. The pulse processing circuit utilizes the indication signal to provide the enabling control signal and the steering control signal.