Internal-combustion engines – Charge forming device – With fuel pump
Reexamination Certificate
2005-08-09
2005-08-09
Gimie, Mahmoud (Department: 3747)
Internal-combustion engines
Charge forming device
With fuel pump
C123S357000
Reexamination Certificate
active
06925990
ABSTRACT:
A fuel pressure control system for a fuel injected engine measures the fuel pressure at an outlet of a fuel pump and controls the operating speed of the fuel pump as a function of the difference between a desired pressure and a measured pressure. Signals are provided to the fuel pump which are pulse width modulated signals that have a pulse width determined as a function of the desired pressure at the outlet of the pump and an actual measured pressure at the outlet of the pump. The desired pressure is determined as a function of air flow into the engine, a desired air/fuel ratio which, in turn, is a function of engine speed and the load on the engine, and a desired fuel rate which is determined as a function of the air/fuel ratio and the air flow into the engine. The desired fuel rate is then used to select a pressure at the outlet of the pump which will result in the desired fuel rate.
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Brunswick Corporation
Gimie Mahmoud
Lanyi William D.
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