Method for controlling a solenoid injector

摘要

A solenoid injector (1) has an actuator (11) comprising a ferromagnetic coil (13). The actuator acts on a needle (5), which prevents an injection of a fluid in a closing position of the needle (5) and otherwise enables the injection of the fluid. In a first step the ferromagnetic coil (13) is energized for moving the needle (5) out of the closing position. In a second step the ferromagnetic coil (13) is de-energized until an electrical current through the ferromagnetic coil (13) reaches a zero value for moving the needle (5) back to the closing position. In a third step a negative electrical current is controlled through the ferromagnetic coil (13) with respect to the electrical current of the second step for a given time (DT).