Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2002-02-27
2004-02-10
Gimie, Mahmoud (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
Reexamination Certificate
active
06688289
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to an improved fuel injection apparatus for internal combustion engines.
2. Description of the Prior Art
One fuel injection apparatus of the type with which this invention is concerned is known from European patent Disclosure EP 0 957 261 a1. For each cylinder of the engine, this fuel injection apparatus has one fuel pump, one fuel injection valve, and one line connecting the fuel injection valve to the fuel pump. The fuel pump has a pump piston, driven in a reciprocating motion, that defines a pump work chamber. A first electrically controlled control valve, by which a communication of the pump work chamber, and thus of the line, with a relief chamber is controlled, is disposed on the fuel pump. The fuel injection valve has an injection valve member, by which at least one injection opening is controlled and which is movable in the opening direction counter to a closing force by means of the pressure prevailing in a pressure chamber communicating with the line. A second electrically controlled control valve is provided on the fuel injection valve, by which control valve the pressure prevailing in a control pressure chamber of the fuel injection valve is controlled, by which pressure the injection valve member is urged at least indirectly in the closing direction. Both the fuel pump and the fuel injection valve have a complicated structure, because of the control valve disposed on them, and for triggering the control valves, electric lines are necessary.
SUMMARY OF THE INVENTION
The fuel injection system of the invention has the advantage over the prior art that the control valves with corresponding electric lines are disposed only on the fuel injection valve, while the fuel pump can be simple in construction, and no electric lines to it are needed.
REFERENCES:
patent: 5622152 (1997-04-01), Ishida
patent: 5671715 (1997-09-01), Tsuzuki
patent: 5771865 (1998-06-01), Ishida
patent: 6520152 (2003-02-01), Mahr et al.
patent: 0957261 (1999-11-01), None
Gruen Juergen
Potschin Roger
Projahn Ulrich
Rodriguez-Amaya Nestor
Gimie Mahmoud
Greigg Ronald E.
Robert & Bosch GmbH
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