| 摘要 |
PROBLEM TO BE SOLVED: To provide a method by which faults caused by a bounce process of a needle such as an imprecise adjustment amount of fuel into a combustion chamber can be effectively avoided. SOLUTION: By this needle valve stroke position estimation method, a stroke of a needle valve in a solenoid valve 1 which moves between downward and upward stoppers is estimated. When the needle valve moves relatively to a coil 3 of the solenoid valve 1, an induced voltage in the coil 3 is detected and associated with the stroke of the needle valve according to a calculation model. |
