Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2005-05-24
2005-05-24
Lo, Weilun (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S458000, C123S467000, C123S514000, C123S516000
Reexamination Certificate
active
06895936
ABSTRACT:
In a common rail type fuel injection system, fuel in a fuel tank is sucked by a feed pump and fed to a pressurizing pump. Fuel pressurized in the pressurizing pump is supplied to a common rail. The pressurized fuel accumulated in the common rail is injected into a cylinder of an internal combustion engine from an injector. All of these operations are electronically controlled by an electronic control unit. To gradually suck air in the fuel tank together with fuel and to avoid air accumulation in a fuel filter, a relief valve is connected to the common rail. The relief valve is opened when the engine is idling thereby to increase an amount of fuel sucked by the feed pump and to gradually suck the air together with the fuel. The relief valve is opened only in interval periods in which fuel is not injected from the injector.
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Denso Corporation
Lo Weilun
Nixon & Vanderhye P.C.
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