Method and device for estimating the position of an actuator body in an electromagnetic actuator to control a valve of an engine

摘要

Method and device for estimating the position (x) of an actuator body (4) in an electromagnetic actuator (1) to control a valve (2) of an engine, according to which the actuator body (4), which is at least partly made of ferromagnetic material, is displaced towards at least one electromagnet (8), by the effect of the force of electromagnetic attraction generated by the electromagnet (8) itself; the position (x) of the actuator body (4) relative to the electromagnet (8) is determined on the basis of the value assumed by the reluctance (R) of a magnetic circuit (18) constituted by the electromagnet (8) and by the actuator body (4).