| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device for controlling the injection quantity of a piezo-type injector with high accuracy regardless of a temperature change. SOLUTION: A current detecting resistance 21 is a resistance for converting charging current flowing through a piezo-element to voltage. A comparator 22 generates a pulse with a longer pulse duration as the charging time is longer according to the amount of time when the voltage converted by the current detecting resistance 21 is above a designated voltage, that is the charging time of the piezo-element. A target voltage generating circuit 23 drops the reference voltage as the pulse duration becomes longer according to the length of pulse duration of a pulse transmitted from the comparator 22. As the target voltage which is an indicating signal generated in the target voltage generating circuit 23 becomes higher, a DC/DC converter 20 boosts up the driving voltage applied to the piezo-element.
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