Method for estimating the magnetisation curve of an electromagnetic actuator for controlling an engine valve

摘要

Method for estimating the magnetisation curve of an electromagnetic actuator for controlling an engine valve, according to which a solenoid is activated by a current determined in order to attract an actuator body and place the actuator body in contact with the solenoid; the current is gradually reduced until the actuator body detaches from the solenoid and the corresponding values assumed by the magnetic flow crossing a magnetic circuit consisting of the solenoid and the actuator body are determined for at least some of the current values.