| 摘要 |
<p>PROBLEM TO BE SOLVED: To facilitate setting a control constant, improve fuel injection control accuracy, and suppress a temperature increase in a booster circuit section in the booster circuit section generating quick excitement high voltage of a fuel injection solenoid coil.SOLUTION: In an inductive element 202 intermittently excited by a boosting on-off element 206 and charging a high-voltage capacitor 204 with a high voltage, an inductive element current Ix proportional to a voltage across a current detection resistor 201A and a detected boosted voltage Vx that is a divided voltage of the high-pressure capacitor 204 are input to a boosting control circuit section 210A via a high-speed A/D converter provided in an arithmetic control circuit section 110A. The boosting control circuit section 210A controls the boosting on-off element 206 to be turned on/off so as to obtain a target boosted high pressure Vh variably set by a microprocessor in the arithmetic control circuit section 110A while adjusting the inductive element current Ix in time for a next quick excitation from a current quick excitation.</p> |
