Piezoelectric actuator drive device

Details Piezoelectric actuator drive device Piezoelectric actuator drive device

2008-08-19

2010-10-12

Budd, Mark (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S316030

Reexamination Certificate

active

07812503

ABSTRACT:
A fuel injection control apparatus drives piezoelectric actuators for opening and closing injectors of respective cylinders based on energy stored in a capacitor of a DC/DC converter. A current detecting resistor for controlling a boost switch to charge the capacitor is disposed at a position at which current flowing through the capacitor is not detected. Further, current detecting resistors for controlling the piezoelectric actuators are disposed at positions at which charging current from a diode to the capacitor is not detected. Thus, the charging of the capacitor can be performed even during the control for charging/discharging the piezoelectric actuator.

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Japanese Office Action dated Aug. 18, 2009, issued in corresponding Japanese Application No. 2007-216155, with English Translation.

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