Method for estimating the magnetisation curve of an electromagnetic actuator for controlling an engine valve
OwnerEgidio D' Alpaos, Michele Morselli +1inventors
InventorsEgidio D' Alpaos, Michele Morselli, Flavia D' Antonio
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Abstract
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.
Claims10
Method for estimating the magnetisation curve (C) of an electromagnetic actuator (1) for controlling an engine valve (2);
- said method provides for activation of a solenoid (8) with a current (i) determined in order to attract an actuator body (4) and place said actuator body (4) in contact with the solenoid (8), gradual reduction of the current (i) until determining detachment of the actuator body (4) from the solenoid (8) and determination, for at least some values of the current (i), of the corresponding values assumed by the magnetic flow (Φ) crossing a magnetic circuit (18) consisting of the solenoid (8) and the actuator body (4).
Dependencies are inferred from the claim text.