Fuel supply apparatus for engine and control method of same...

Internal-combustion engines – Charge forming device – Fuel injection system

Reexamination Certificate

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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.

REFERENCES:
patent: 5937826 (1999-08-01), Olson et al.
patent: 6053147 (2000-04-01), Hemmerlein et al.
patent: 6234148 (2001-05-01), Hartke et al.
patent: 6293251 (2001-09-01), Hemmerlein et al.
patent: 6557530 (2003-05-01), Benson et al.
patent: 7007676 (2006-03-01), Schuricht et al.
patent: 19800760 (1998-08-01), None
patent: 2000-511992 (2000-09-01), None
patent: WO 99/45260 (1999-09-01), None

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