Back to results
US 4,757,795 AGranted
Method and apparatus for regulating fuel injection timing and quantity
AssigneeStanadyne, Inc.
InventorWilliam W. Kelly
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeStanadyne, Inc.
InventorWilliam W. Kelly
Estimating the term…
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 reglating 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.
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 and deliver fuel above a certain high pressure for injection of a charge of fuel, and regulating means for regulating the injection timing and quantity of each injected charge of fuel, the improvement wherein the regulating means comprises a bidirectional flow, electromagnetic valve having open and closed positions and which, in its open position, 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 valve having an electromagnet adapted to be energized and deenergized to open and close the valve, and control means actively governing the energization and deenergization of the valve electomagnet to regulate the intake charge quantity of fuel supplied to the charge pump and thereby regulate the fuel injection timing solely by selectively closing the valve during each intake stroke and to regulate the injected charge quantity solely by selectively opening the valve during each pumping stroke to spill fuel from the charge pump and thereby terminate said delivery of fuel.
A method of regulating the fuel injection timing and quantity of an internal combustion engine fuel injection system having a charge pump with reciprocating pumping means with periodic intake and pumping strokes to periodically receive an intake charge of fuel supplied at a first relatively low pressure and deliver fuel above a second relatively high pressure substantially higher than said first pressure for injectin of a charge of fuel, the method comprising the step of providing a bidirectional flow, electromagnetic valve having open and closed positions and which, in its open position, 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 and which has an electromagnet adapted to be energized and deenergized to open and close the valve, and the step of actively governing the energization and deenergization of the valve electromagnet to regulate the intake charge quantity of fuel supplied to the charge pump and thereby regulate the fuel injection timing solely by selectively closing the valve during each intake stroke and to regulate the injected charge quantity solely by selectively opening the valve during each pumping stroke to spill fuel from the charge pump and thereby terminate said delivery of fuel.
A method of regulating the fuel injection timing and quantity of an internal combustion engine fuel injection system having a charge pump with reciprocating pumping means and operating cam means for reciprocating the pumping means, the operating cam means having intake and pumping ramp 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, the charge pump having a fixed charge pump stroke timing of reciprocation of said pumping means, the method comprising the step of providing a bidirectional flow, electromagnetic valve having open and closed positions and which, in its open position, 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 and which has an electromagnet adapted to be energized and deenergized to open and close the valve, and the step of actively governing the energization and deenergization of the valve electromagnet to regulate the intake charge quantity supplied to the charge pump during each intake stroke and thereby regulate the fuel injection timing, solely by precisely closing the valve during the intake stroke, and to regulate the injected charge quantity solely by regulating the termination of said high pressure delivery of fuel during each pumping stroke by precisely opening the valve during the pumping stroke.
A method of regulating the fuel injection timing and quantity of an internal combustion engine fuel injection system having a charge pump with reciprocating pumping means and operating cam means for reciprocating the pumping means, the operating cam means having intake and pumping ramp 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, the charge pump having an adjustable charge pump stroke timing of reciprocation of said pumping means, the method comprising the step of providing a bidirectional flow, electromagnetic valve having open and closed positions and which, in its open position, 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 and which has an electromagnet adapted to be energized and deenergized to open and close the valve, the step of adjusting the charge pump stroke timing, and the step of actively governing the energization and deenergization of the valve electromagnet to regulate the intake charge quantity supplied to the charge pump during each intake stroke and thereby regulate the fuel injection timing, solely by precisely closing the valve during the intake stroke in accordance with the charge pump stroke timing and to regulate the injected charge quantity solely by regulating the termination of said high pressure delivery of fuel during each pumping stroke by precisely opening the valve during the pumping stroke in accordance with the fuel injection timing resulting from the charge pump stroke timing and the intake charge quantity supplied to the charge pump during the preceding intake stroke.
Dependencies are inferred from the claim text.