Electrically controlled unit injector

Details Electrically controlled unit injector Electrically controlled unit injector

1982-04-02

1983-12-06

Nase, Jeffrey V.

Fluid sprinkling, spraying, and diffusing

Unitary injection nozzle and pump or accumulator plunger

239125, F02M 4702

Patent

active

044188676

ABSTRACT:
An electrically controlled unit injector for a diesel engine wherein both timing of injection and the quantity of fuel premetered into the injector are controlled by a single solenoid. The control of the timing portion of the cycle is accomplished by a timing port of the valve which, when open, permits fuel to flow into the timing chamber and, when closed, operates against high pressure to shut off the flow of fuel from the timing chamber. The metering function is initiated by the upward travel of a metering plunger in response to the upward travel of a pumping plunger while the timing port of the valve is closed. Metering is terminated by a metering port of the valve which shuts off the supply of fuel to the metering chamber. The timing and metering ports of the valve are controlled by the single solenoid. Metering quantity control may be of the pressure-time or volumetric metering type.

REFERENCES:
patent: 3951117 (1976-04-01), Perr
patent: 4235374 (1980-11-01), Walter et al.
patent: 4281792 (1981-08-01), Sisson et al.

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