Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2007-04-27
2008-08-19
Gimie, Mahmoud (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S1980DA
Reexamination Certificate
active
07412968
ABSTRACT:
In a fuel supply apparatus for an engine, which is provided with a relief valve for returning fuel in a fuel pipe into a fuel tank when a fuel pressure exceeds a threshold, and also feedback controls a discharge amount of a fuel pump so that the fuel pressure detected by a pressure sensor approaches a target pressure, when the pressure sensor is failed, a duty of a PWM signal for the fuel pump is fixedly maintained at a predetermined value, and fuel injection pulse width is calculated on the assumption that the fuel pressure is held at the threshold.
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Furuya Junichi
Takayanagi Keiichi
Foley & Lardner LLP
Gimie Mahmoud
Hitachi , Ltd.
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