| 摘要 |
<P>PROBLEM TO BE SOLVED: To open a solenoid valve in constant valve opening timing all the time without being affected by temperature variation or individual variation even if there is such variation in inductance of a coil of the solenoid valve. <P>SOLUTION: A capacitor C10 for discharging is charged by a booster circuit 50 in such a manner that its charging voltage becomes a target DC-DC voltage Vt. The target DC-DC voltage Vt is set by a microcomputer 130. When discharging from the capacitor C10 to a coil 101a of a cylinder #1 is performed, the microcomputer 130 calculates actual discharge energy En that is actually discharged from the capacitor C10 during a discharge period, and compares the calculated energy with reference energy Er. If En is not matched with Er, on the basis of a difference between the both, the target DC-DC voltage Vt is reset in such a manner that En=Er is satisfied in the discharge period, subsequent to next one, to the coil 101a of the cylinder #1. <P>COPYRIGHT: (C)2013,JPO&INPIT |
