Electromagnetic injection control valve in unit fuel injector

Details Electromagnetic injection control valve in unit fuel injector Electromagnetic injection control valve in unit fuel injector

1984-05-16

1985-03-19

Lazarus, Ronald H.

Internal-combustion engines

Charge forming device

Fuel injection system

123458, F02M 5702

Patent

active

045052433

ABSTRACT:
A unit fuel injector suited to diesel engines, including an injection pump portion and an injection nozzle portion both constructed in a known manner and an improved electromagnetic injection control valve, which is a normally open valve to permit leak of fuel pressure from the pump portion and closes in response to an electrical pulse signal to thereby allow increase of the fuel pressure transmitted to the nozzle and resultant lifting of a valve normally closing the spray-holes. The injection control valve is provided with a back-pressure chamber to which fuel pressure leaking from the pump portion is transmitted through a pressure-balancing passage to act on the back end of the control valve member to thereby cancel a valve-opening force produced by the action of the same fuel pressure on the tip of the valve member. So, the effective area of the leak orifice defined between the tip portion of the valve member and the valve seat can be enlarged without the need of augmenting the electromagnetic force for seating of the valve, which results in rapid lowering of the injection pressure upon termination of the supply of the pulse signal.

REFERENCES:
patent: 2598528 (1952-05-01), French
patent: 3146769 (1964-09-01), Hall
patent: 4129253 (1978-12-01), Bader, Jr. et al.

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