Method of estimating the effect of the parasitic currents in an electromagnetic actuator for the control of an engine valve

摘要

A method of estimating the effect of the parasitic currents (ipar) in an electromagnetic actuator (1) for the control of an engine valve (2), the parasitic currents (ipar) being modelled by means of an equivalent parasitic current (ip) which circulates in an equivalent turn (p) which is short-circuited and magnetically coupled to a magnetic circuit (18) formed by an electromagnet (8) and an actuator body (4) and the value of the equivalent parasitic current (ip) being estimated by resolving the differential equation obtained by applying the generalised Ohm's law to the equivalent turn (p).