Patent ID: 7261090

Claim:
An electromagnetic controlled fuel injector composed such that fuel injection timing is controlled through shutting-off/allowing communication of a fuel passage, which connects to a plunger room where fuel is introduced and compressed to high pressure, and composed with a spill passage connecting to a spill line by opening/closing a poppet valve reciprocated by means of a solenoid device, wherein a command piston device is provided at an end side of said poppet valve opposite to said solenoid device, said command piston device has a command piston capable of being contacted with the end face of said end side of said poppet valve, and said command piston moves in conjunction with the move of said poppet valve so that the opening area of a valve seat passage formed between the seat parts of said poppet valve and valve seat member increases when said solenoid device is deexcited to allow said poppet valve to be opened for spilling high pressure fuel.