Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1981-11-25
1984-05-22
Lall, Parshotam S.
Internal-combustion engines
Charge forming device
Fuel injection system
123390, 123512, F02D 502, F02M 5100
Patent
active
044495064
ABSTRACT:
In a fuel control system for a fuel injected internal combustion engine, fuel is pumped from a tank by a cheek plate unloading pump to the fuel rail which supplies the fuel injectors. The delivery pressure of the pump is controlled by a microprocessor which receives inputs from a number of sensors of engine operating variables. The microprocessor generates a control signal which controls the pump output pressure by actuating a solenoid-type linear actuator. The solenoid has an actuator rod which positions a spool in a control valve which regulates the pressure in a cavity behind the cheek plate in response to the control signal. If there is no control signal from the microprocessor, a spring moves the actuator rod to a position where it partially obstructs a passage through which the pump output flows. The partial obstruction or constriction creates a pressure drop which is proportional to the speed at which the pump is driven by the engine. The pressure drop is then used to position the spool of the control valve.
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patent: 4176641 (1979-12-01), Perr
Lall Parshotam S.
TRW Inc.
Wolfe W. R.
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