| 摘要 |
<p>PROBLEM TO BE SOLVED: To decrease the number of components of a solenoid valve controller.SOLUTION: In a fuel injection controller 1, a microcomputer 25 controls a discharge switch 21 for producing electric discharge on a coil 5 of a solenoid valve 3 serving as an injector from a capacitor 19 and a constant-current switch 11 for applying a constant current to the coil 5 from a battery voltage VB to be turned on/off. The microcomputer 25 detects a charging voltage VC of the capacitor 19, and calculates target discharge time that is time for which the discharge switch 21 is turned on so that a maximum value of a discharge current from the capacitor 19 to the coil 5 is equal to a target maximum value on the basis of a detection value of the charging voltage VC. Furthermore, the microcomputer 25 calculates target ON-time that is time for which the constant-current switch 11 is turned on per switching cycle so that the constant current is equal to a target current on the basis of a detection value of the battery voltage VB.</p> |
