US Patent 7350539 Electromagnetic controlled fuel injection apparatus with poppet valve

An electromagnetic controlled fuel injection apparatus has a poppet valve which controls the beginning and end of fuel injection by reciprocation. Inertia force and friction force arising from the reciprocating motion of the poppet valve are utilized effectively to suppress bounce of the poppet valve. The poppet valve has a sealed inside space, and a plurality of mass objects are received in the inside space so that the mass objects can move axially while contacting with each other in the inside space due to the inertia force generated by the reciprocating motion of the poppet valve.