Piezoelectric element i.e. piezo actuator, charging and discharging method for fuel injection valve for internal combustion engine, involves introducing actual energy during determining duration of charging process or discharging process

摘要

The method involves monitoring a charging voltage (UL) for determining duration of a charging process or a discharging process. An actual energy linked in a coil (L1) is introduced during determining the duration of the charging process or the discharging process. The charging voltage is reduced by a voltage divider (R1, R2). The energy linked in the coil is determined by a voltage drop over a shunt resistor (R3), which is connected in a current flow (IL) of the coil. A reference voltage of the voltage divider is changed by the voltage drop over the shunt resistor against a mass potential. An independent claim is also included for a device for charging and discharging a piezoelectric element.