Patent ID: 7350539

Claim:
An electromagnetic controlled fuel injection apparatus comprising: a plunger for compressing fuel in a plunger chamber; a fuel passage communicating with the plunger chamber; a passage connecting to said fuel passage and to a spill passage communicating with a fuel return line; a poppet valve arranged to control fuel injection beginning and fuel injection end by opening and closing said passage connecting to said fuel passage and to said spill passage by reciprocation in a reciprocating direction, said poppet valve having a solenoid device and a poppet valve spring arranged to reciprocate said poppet valve in said reciprocating direction; a sealed space inside said poppet valve that extends in said reciprocating direction; a plurality of mass objects received in said sealed space in a single file column of said mass objects extending in said reciprocating direction such that said mass objects can move in said reciprocating direction while contacting with each other along said reciprocating direction, due to inertia force generated by reciprocating motion of said poppet valve.