Internal-combustion engines – Charge forming device – Auxiliary control of carburetor fuel metering
Patent
1994-01-13
1995-08-22
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Auxiliary control of carburetor fuel metering
123497, 123585, F02D 302, F02M 3708
Patent
active
054430461
ABSTRACT:
In a low pressure continuous flow fuel injection system for an internal combustion engine, an electric fuel pump (18) is energized with a variable duty cycle to vary the pumped volume output of the pump according to engine fuel requirements. The duty cycle is varied to energize the pump to pump substantially only the amount of fuel required by the engine, such that at idle or low engine speed, the pump is energized a lower percentage of the time than at high engine speed. Fuel flow through the fuel injector (12) is continuous, but energization of the pump is not, such that the pump is not pumping at full capacity when unneeded. An electric idle air control valve (54) is also energized with a variable duty cycle to vary the amount of bypass idle air supplied to the intake manifold (10).
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Brunswick Corporation
Wolfe Willis R.
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