| 摘要 |
PURPOSE: An apparatus and a method are provided to achieve improved cold start ability of engine, while reducing emission of hydro-carbon and smoke and parts count. CONSTITUTION: An apparatus comprises a primary fuel pump(110) for pumping a low pressure fuel; a secondary fuel pump(120) having an input terminal connected to the output terminal of the primary fuel pump, and which presses the fuel being supplied from the primary fuel pump; a fuel rail(130) for supplying the pressurized fuel to an injector, and suppressing fluctuation of the pressure of the pressurized fuel being supplied from the secondary fuel pump; a fuel rail relief valve(140) for maintaining the fuel pressure in the fuel rail by being open/shut in accordance with the fuel pressure in the fuel rail; a fuel pressure sensor(150) for measuring the pressure of the fuel in the fuel rail; a fuel check valve(160) interposed between the output terminal of the secondary fuel pump and the fuel rail, and which controls flow of the fuel being supplied from the secondary fuel pump to the fuel rail; a water temperature sensor(170) for sensing the water temperature of the gasoline direct injection engine; an engine control unit(180) for analyzing the signal input from the sensors, and generating a fuel pressure control signal during the cold start of the engine; and a fuel pump relief valve(190) for maintaining the transmission pressure of the secondary fuel pump at the preset pressure level.
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