Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2007-04-02
2008-08-05
Gimie, Mahmoud (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S456000
Reexamination Certificate
active
07406946
ABSTRACT:
A method and apparatus for attenuating fuel pump noise in a direct injection internal combustion engine. In one proposal, the direct injection fuel nozzle is suspended from a fuel rail in a fashion that avoids direct metal-to-metal contact between the injector and the engine block. The direct injection nozzle may also be connected to the fuel rail by a pair of spaced-apart seals which equalize the longitudinal pressure on the nozzle during operation. Enlarged diameter fuel reservoirs and/or a restricted orifice may be provided fluidly in series between the fuel pump and the direct injection nozzle in order to attenuate noise resulting from fuel pump pulsation.
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Badarinarayan Harsha
Borg Jonathan
Hohkita Atsushi
McCune Donald J.
Saeki Hiroaki
Gifford, Krass, Sprinkle Anderson & Citkowski, PC
Gimie Mahmoud
Hitachi , Ltd.
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