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

2005-11-01

2005-11-01

Moulis, Thomas (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C417S562000

Reexamination Certificate

active

06959694

ABSTRACT:
The fuel injection system has a high-pressure pump which pumps fuel into a reservoir to be supplied to injectors disposed at the engine cylinders. A feed pump supplies fuel to the high-pressure pump. The high-pressure pump has at least one pump element including a pump piston that defines a work chamber and is driven in a reciprocating motion; the work chamber has a communication with the compression side of the feed pump, in which an intake valve opening toward the work chamber is disposed, and through which valve fuel flows into the work chamber upon the intake stroke of the pump piston. The intake valve has a valve member, which is urged in a closing direction by a closing spring, and the closing spring is braced at least indirectly on the pump piston; with an increasing intake stroke of the pump piston, the closing force exerted on the valve member by the closing spring becomes less. A minimal opening differential pressure of the intake valve is less than 0.9 bar.

REFERENCES:
patent: 6457957 (2002-10-01), Bauer et al.
patent: 6558142 (2003-05-01), De Matthaeis
patent: 6581577 (2003-06-01), Geyer
patent: 6764286 (2004-07-01), Hunnicutt et al.
patent: 198 48 035 (2000-04-01), None
patent: 199 41 850 (2001-03-01), None
patent: 1 022 460 (2000-07-01), None
patent: WO 95/25887 (1995-09-01), None
patent: WO 00/20753 (2000-04-01), None

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