Patent ID: 6081062
Filing Date: 2000-06-27
Classification: F02D,H02N

Abstract:
A method for driving at least one capacitive actuator, including a piezoelectrically operated fuel injection valve of an internal combustion engine, which comprises:charging, at a start of a driving operation, an actuator of a plurality of actuators with a prescribable charging voltage via a coil from a series circuit composed of a charging capacitor and a charge-reversing capacitor, and discharging the actuator into the charge-reversing capacitor at an end of the driving operation;comparing an actuator voltage of the actuator due to the prescribable charging voltage with a prescribed desired-value voltage;determining a new charging voltage for a next driving operation in dependence on a difference between the prescribed desired-value voltage and the actuator voltage; andcharging the charging capacitor for the next driving operation to a voltage corresponding to a difference between the new charging voltage and a voltage present across the charge-reversing capacitor.