Electronically controlled, solenoid operated fuel injection...

Details Electronically controlled, solenoid operated fuel injection... Electronically controlled, solenoid operated fuel injection...

F - Mech Eng,Light,Heat,Weapons

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F02M 51/00 (2006.01) F02M 57/02 (2006.01) F02M 59/10 (2006.01)

Patent

CA 1116962

ABSTRACT A fuel injection system for injecting fuel into the combustion chamber of an internal combustion engine includes a multi-way valve, a solenoid for controlling the operation of the valve, a shuttle valve that is moved within a shuttle chamber in response to the change of state of the solenoid, and an intensifier piston having an upper cylinder movable within actuating chamber and a lower cylinder movable within metering chamber 50. The position of the shuttle valve, in turn, regulates the admission of pressurized fuel from a high pressure pump into the actuating chamber to drive the intensifier piston in a first direction. The lower cylinder 66 of the piston 62 is movable within the metering chamber to amplify the pressure of the fuel to a level several times greater than supply pressure prior to introducing same into a fuel injector for discharge into the combustion chamber. A T-shaped passage in the piston allows the injection phase of the cycle of operation to be terminated sharply by a rapid dissipation of the pressure buildup. Variable restrictions such as a needle valve, are disposed in a return conduit that allows the fuel in the actuating chamber to be returned to the fuel reservoir and to regulate the volume of fuel that can return to the reservoir per unit of time during the metering phase of operation.

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