Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1982-05-06
1985-03-19
Myhre, Charles J.
Internal-combustion engines
Charge forming device
Fuel injection system
123575, 123300, 123501, 417387, 417386, F02M 4702, F02M 4506
Patent
active
045052441
ABSTRACT:
A fuel injection system is provided for a multicylinder internal combustion engine. Each cylinder is provided with at least one fuel injector. The system includes a cam-operated pumping plunger which maintains fluid pressure within an accumulator and controls the intermittent application of fluid pressure from the accumulator through a first chamber in which the plunger moves to one end of a metering plunger. The opposite end of the metering plunger coacts with a second chamber in which the metering plunger moves to define a cavity into which fuel is supplied for subsequent feeding to the cylinder injector. Fuel enters the cavity during those periods when the metering plunger is not subjected to the accumulator fluid pressure, the latter being under the control of the pumping plunger. The pumping plunger reciprocates within its chamber and is rotatable about its longitudinal axis. An elongated groove is formed in and encompasses the exterior of the pumping plunger. The effective axial length of the groove may be varied depending upon the relative position of rotation of the pumping plunger within the first chamber, so that the time may be changed as to when the accumulator fluid pressure is intermittently supplied to the metering plunger via the first chamber and during the pumping stroke of the plunger. The rotational adjustment of the pumping plunger is controlled by external means which may be responsive to the operational demands of the engine.
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Cummins Engine Company, Inc.
Miller Carl Stuart
Myhre Charles J.
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