Fuel injection system for an internal combustion engine

Details Fuel injection system for an internal combustion engine Fuel injection system for an internal combustion engine

2005-12-06

2005-12-06

Miller, Carl S. (Department: 3747)

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

C123S479000

Reexamination Certificate

active

06971368

ABSTRACT:
A fuel injection system for an internal combustion engine includes a fuel supply pump, a fuel pressure detector, and a control unit. The fuel supply pump supplies pressurized fuel to a fuel injection valve in the internal combustion engine. The fuel pressure detector detects the pressure of the fuel supplied. The control unit controls the amount of the fuel supplied based on a deviation between an actual fuel pressure and a target fuel pressure. The control unit includes an integral term calculator and an integral term holder. The integral term calculator adds an integral compensation quantity and a last-time integral term to calculate a this-time integral term based on an integral compensation quantity that is updated according to the deviation. The integral term holder stops the updating of the integral compensation quantity and retains the last-time integral term when a defect in the fuel supply pump is detected.

REFERENCES:
patent: 5493902 (1996-02-01), Glidewell et al.
patent: 5723780 (1998-03-01), Miwa et al.
patent: 6032639 (2000-03-01), Goto et al.
patent: 6205977 (2001-03-01), Hirakata et al.
patent: 6497223 (2002-12-01), Tuken et al.
patent: 6694945 (2004-02-01), Kawaguchi et al.
patent: 6755176 (2004-06-01), Takeuchi et al.
patent: A-2001-82230 (2001-03-01), None

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