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An internal combustion engine fuel injection system having a reciprocating charge pump and a bidirectional flow, solenoid valve for precisely regulating the fuel injection timing by precisely regulating the intake charge quantity of fuel supplied to the charge pump during each intake stroke and for

An internal combustion engine fuel injection system having a reciprocating charge pump and a bidirectional flow, solenoid valve for precisely regulating the fuel injection timing by precisely regulating the intake charge quantity of fuel supplied to the charge pump during each intake stroke and for precisely regulating the fuel injection quantity by precisely regulating the spill termination of the high pressure delivery of fuel during each pumping stroke. An electrical controller having a data processor timely energizes and deenergizes the solenoid valve and adjusts the charge pump stroke timing, if adjustable, for adjusting the fuel injection timing and quantity. A start-of-pumping sensor or charge pump stroke timing sensor is used to provide a closed loop feedback, or in the alternative where the charge pump stroke is not adjustable, a calibrated input is used in lieu of a charge pump stroke timing sensor.

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In an internal combustion engine fuel injection system having a charge pump with reciprocating pumping means and operating cam means providing periodic intake and pumping strokes of the pumping means to periodically receive an intake charge of fuel supplied at relatively low pressure and deliver fue

In an internal combustion engine fuel injection system having a charge pump with reciprocating pumping means and operating cam means providing periodic intake and pumping strokes of the pumping means to periodically receive an intake charge of fuel supplied at relatively low pressure and deliver fuel at relatively high pressure for injection of a charge of fuel, and regulating means for regulating the fuel injection timing and quantity of each injection charge of fuel, the improvement wherein the regulating means comprises electrical valve means connected to the charge pump and having open and closed positions and which, in the open position thereof, is operable to supply fuel to the charge pump during the intake stroke and to spill fuel from the charge pump during the pumping stroke, the electrical valve means being selectively electrically operable for selectively electrically opening and selectively electrically closing the electrical valve means, and control means actively governing the electrical operation of the electrical valve means during each intake stroke and during each pumping stroke, the control means selectively electrically closing the electrical valve means during each intake stroke to regulate the intake charge quantity of fuel supplied to the charge pump during each intake stroke and thereby regulate the fuel injection timing, the control means selectively electrically opening the electrical valve means during each pumping stroke to regulate the injected charge quantity by regulating the termination of said high pressure delivery of fuel.