Patent Document ID: 20020117132
Application ID: 10007860
Patent Flag: 0

Claim One:
1. A method of estimating the effect of the parasitic currents (i par ) in an electromagnetic actuator ( 1 ) for the control of an engine valve ( 2 ), the actuator body ( 4 ) being made at least partially from ferromagnetic material and being displaced towards at least one electromagnet ( 8 ) under the action of the force of magnetic attraction generated by this electromagnet ( 8 ), the method being characterised in that the parasitic currents (i par ) are modelled by means of an equivalent parasitic current (i p ) which circulates in an equivalent turn (p) which is short-circuited and magnetically coupled to a magnetic circuit ( 18 ) formed by the electromagnet ( 8 ) and the actuator body ( 4 ) and in that the value of the equivalent parasitic current (i p ) is estimated by resolving the differential equation obtained by applying the generalised Ohm's law to the equivalent turn (p).