Direct injection fuel system utilizing water hammer effect

Details Direct injection fuel system utilizing water hammer effect Direct injection fuel system utilizing water hammer effect

2007-10-23

2008-11-11

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S179170

Reexamination Certificate

active

07448361

ABSTRACT:
A method is described for operating a fuel system during start up, the system utilizing gasoline direct injection for an internal combustion engine including a first pump and second pump, an electromechanical valve, and a check valve fluidly coupled downstream of the first pump. The fuel system further includes a fuel rail downstream of the check valve and direct fuel injectors coupled to the engine. The method includes generating a flow of fuel in the fuel system via the first pump during an engine start before ignition of the engine; actuating the valve during the fuel flow to generate a pressure wave that travels through the fuel system past the check valve; and injecting fuel via the direct fuel injectors at an increased pressure generated by the pressure wave and held in the fuel rail via the check valve.

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