Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2005-05-03
2005-05-03
Moulis, Thomas (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S447000
Reexamination Certificate
active
06886535
ABSTRACT:
The fuel injection apparatus has a high-pressure fuel pump and a fuel injection valve for each cylinder of the engine. The pump has at least one piston driven by the engine and delimiting a pump working chamber supplied with fuel from a fuel tank. A control valve at least indirectly controls a connection of the pump working chamber to a relief chamber and a pressure source in order to fill the pump working chamber during the intake stroke. The pump has a first pump piston inside which a second pump piston is guided approximately coaxially, with the two pistons delimiting the working chamber. The first piston is driven in a stroke motion, and the two pistons can optionally be coupled to move together as a unit during the delivery stroke, or the second piston can be fixed in a passive position so that only the first pump piston executes the delivery stroke.
REFERENCES:
patent: 3847510 (1974-11-01), Fenne
patent: 4784101 (1988-11-01), Iwanaga et al.
patent: 5709341 (1998-01-01), Graves
patent: 6021760 (2000-02-01), Boecking
patent: 6267306 (2001-07-01), Phillips et al.
patent: 0 987 431 (2000-03-01), None
Greigg Ronald E.
Moulis Thomas
Robert & Bosch GmbH
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