Common-rail fuel injection system for an engine

Details Common-rail fuel injection system for an engine Common-rail fuel injection system for an engine

1995-11-22

1997-06-17

Miller, Carl S.

Internal-combustion engines

Charge forming device

Fuel injection system

123458, F02M 3704

Patent

active

056387911

ABSTRACT:
A common-rail fuel injection system for an engine includes a fuel injector having a nozzle hole. A common rail stores high-pressure fuel. The common rail is connected to the fuel injector to feed the high-pressure fuel thereto. A movable nozzle needle disposed in the fuel injector blocks and unblocks the nozzle hole in accordance with movement thereof. A back pressure control chamber defined in the fuel injector is connected to the common rail to receive the high-pressure fuel therefrom. The nozzle needle is urged in a direction of blocking the nozzle hole in response to a pressure in the back pressure control chamber. A fuel chamber defined in the fuel injector is connected to the common rail to receive the high-pressure fuel therefrom. The nozzle needle is urged in a direction of unblocking the nozzle hole in response to a pressure in the fuel chamber. A fuel-pressure-responsive 2-way valve controls the pressure in the back pressure control chamber. An electromagnetic valve changes a state of the fuel-pressure-responsive 2-way valve. The fuel injector and the fuel-pressure-responsive 2-way valve are combined into a single unit. The electromagnetic valve is separate from the fuel injector.

REFERENCES:
patent: 4249497 (1981-02-01), Eheim
patent: 4545352 (1985-10-01), Jourde
patent: 4546749 (1985-10-01), Igashira
patent: 4603671 (1986-08-01), Yoshinaga
patent: 4640252 (1987-02-01), Nakamura
patent: 4909440 (1990-03-01), Mitsuyasu
patent: 5156132 (1992-10-01), Iwanaga

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