Switching circuitry for sequential fuel injection

Abstract

Abstract SWITCHING CIRCUITRY FOR SEQUENTIAL FUEL INJECTION IN WHICH TRANSISTOR DRIVER STAGES FOR INJECTOR VALVE ACTUATORS ARE COUPLED TO AND GATE MEANS HAVING INPUTS TO WHICH TIMING SIGNALS ARE APPLIED FROM FLIP-FLOP MEANS AND HAVING ADDITIONAL INPUTS TO WHICH CONTROL SIGNALS ARE APPLIED FROM A SEQUENCING CIRCUIT, PREFERABLY COMPRISING A DIGITAL COUNTER AND DECODER GATES FOR DEVELOPING THE CONTROL SIGNALS. THE CONTROL SIGNALS HAVE A DURATION SUFFICIENT TO ALLOW THE TIMING SIGNALS TO EFFECT OPENING OF THE INJECTOR VALVES FOR NEARLY 180 DEGREES OF CRANKSHAFT ROTATION, IN TIMED RELATION TO THE INTAKE STROKES. IN ONE EMBODIMENT, DESIGNED FOR A FOUR CYLINDER ENGINE, A SINGLE TIMING FLIPFLOP IS USED WHILE IN OTHER EMBODIMENTS, DESIGNED FOR EIGHT CYLINDER ENGINES, TWO FLIP-FLOPS ARE USED IN A MANNER TO PERMIT OVERLAP OF THE TIMES OF OPENING OF THE FUEL INJECTION VALVES. ADDITIONAL FEATURES RELATE TO THE APPLICATION OF PRE AND POST BIAS SIGNALS IN COMBINATION WITH A SHORT DURATION VALVE OPENING PULSE IN A MANNER TO PERMIT RAPID AND ACCURATE CONTROL OF THE OPENING AND CLOSING OF THE INJECTOR VALVES.

Inventors

• 👤 B Scofield

Bibliographic Details