| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection valve capable of more precisely controlling an optimum supply flow amount with the opening/closing of the fuel injection port of an injection nozzle. SOLUTION: During deenergizing a solenoid 10, the force of a spring 17 is applied to a first valve rod 2 via a second valve rod 8 and the valve rod 2 abuts on a valve seat to close an orifice 32. When the solenoid 10 is energized, a magnetostrictive element 9 elongates, the second valve rod 8 is lifted up against the force of the spring 17, and the first valve rod 2 is lifted up to abut on a stopper 6 while following the movement of the second valve rod 8 with the force of the spring 4 and moved apart from the valve seat to open the orifice 32 (open the injection nozzle). The magnetostriction amount of the magnetostrictive element 9 is controlled so that the lift amount of the second valve rod 8 from an initial position during valve opening control of the injection nozzle 1 is greater than the lift amount of the first valve rod 2 to a position restricted by the stopper 6. COPYRIGHT: (C)2007,JPO&INPIT
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