Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1989-01-19
1990-03-20
Miller, Carl Stuart
Internal-combustion engines
Charge forming device
Fuel injection system
123387, F02M 3900
Patent
active
049092197
ABSTRACT:
A hydromechanical fuel pump system of supplying timing fluid and fuel to high pressure fuel injectors utilizing a hydromechanical fuel control circuit to control the flow of fuel that is withdrawn from a fuel reservoir by a pump and delivered to the fuel injectors which includes a speed signal generator that produces a fuel pressure in a speed signal branch line of the fuel control circuit that is a function of engine rpm, and a torque shaping module that is provided in a fuel delivery branch of the fuel control circuit. The torque shaping module controls the supply pressure of the fuel flow to the injectors so that, during an initial engine operating range, the supply pressure is merely that as received from the fuel pump, in a second engine operating range, the torque shaping module causes the supply pressure to be a function of fuel pressure in the speed signal branch line as boosted by an assist means, the effect of which is removed in a third engine operating range, and in a last engine operating range, the supply pressure is determined by partially offsetting the effect of the pressure in the speed signal branch line by a counterpressure factor.
REFERENCES:
patent: 3026565 (1962-05-01), Reiners
patent: 3443554 (1969-05-01), Kleeberger
patent: 3908621 (1975-09-01), Hussey
patent: 3927654 (1975-12-01), Perr
patent: 3968779 (1976-07-01), Davis
patent: 4041920 (1977-08-01), Skinner
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patent: 4328778 (1982-05-01), Huperz
patent: 4721247 (1988-01-01), Perr
The Oil Engine and Gas Turbine, "New Pressure-Time Fuel System: Cummins Layout of the Latest Form", Apr., 1961.
Perr Julius P.
Peters Lester L.
Smith Edward D.
Cummins Engine Company, Inc.
Miller Carl Stuart
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