Electrically controlled unit injector

• Main Author: SISSON; ALBERT E
• Format: Patent
• Language: English
• Published: 06.12.1983
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

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.