Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1990-01-10
1991-07-09
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
123496, 123506, 239 88, 239124, F02M 4512, F02M 5934
Patent
active
050295683
ABSTRACT:
A unit fuel injector for a fuel injection system for an internal combustion engine is described that is reciprocably driven from a camshaft by a drive train, and the unit injector includes a device for controlling the rate of fuel injection into an engine cylinder. The rate control device operates to divert or bleed off a quantity of fuel from the main metering chamber of an open-nozzle type fuel injector during an initial phase of injection, and the diverted fuel is returned to the metering chamber at a later phase in the injector operation. The rate control device includes an auxiliary metering chamber which receives the diverted fuel via an auxiliary passageway. An auxiliary plunger is mounted within the auxiliary metering chamber. A biasing device such as a helical spring or a fluid pressure spring, controls the inward and outward movement of the auxiliary plunger. The biasing device causes the auxiliary plunger to return the diverted fuel to the metering chamber when the pressure of the auxiliary plunger biasing device exceeds the fluid pressure within the metering chamber. In one embodiment, the biasing device is adjustable by controlling a control pressure of a fluid pressure spring.
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Argenbright Tony M.
Cummins Engine Company, Inc.
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