Synchronizing means for sequential fuel injection

Claim 1

A fuel injection control system for an engine including a plurality of cylinders and fuel injection valve means associated with each cylinder for injection of fuel for flow into each cylinder during the intake stroke thereof, electrically energizable actuator means for each of said fuel injector valve means, spark plug means for each cylinder, ignition pulse generating means for generating an ignition pulse in predetermined phase relation to each and every power stroke of the engine, and distributor means for applying said ignition pulses to said spark plug means in sequence, said control system comprising: a sequencing circuit for supplying sequencing signals in synchronized relation to intake strokes of the engine, timer means for supplying tiMing signals, means responsive to said sequencing and timing signals for energizing said actuator means, said sequencing circuit having a plurality of stable states respectively corresponding to said actuator means and being arranged to be indexed from one state to another in a predetermined order and to develop in each of said states a sequencing signal for control of the corresponding actuator means in response to a timing signal from said timer means, index pulse means for supplying to said sequencing circuit an index pulse in predetermined phase to each and every power stroke of the engine to index said sequencing circuit from one state to another, and reset pulse means for supplying to said sequencing circuit a reset pulse in predetermined phase relation to the power stroke of a predetermined one of the engine cylinders to reset said sequencing circuit to a predetermined initial state, said index pulse means being arranged for coupling to said ignition pulse generating means to develop and index in response to each ignition pulse, and said reset pulse means being arranged for coupling to said distributor means to develop a reset pulse in response to each ignition pulse applied to the spark plug means for said predetermined one of the engine cylinders, said index pulse means comprising a first monostable multivibrator, said reset pulse means comprising a second monostable multivibrator, said first and second multivibrators being triggered in response to ignition pulses from said ignition pulse generating means and said distributor means.