Patent ID: 6683775
Filing Date: 2004-01-27
Classification: F01L

Abstract:
A control method for an electromagnetic actuator (1) for the control of an engine valve (2), the method comprising the electrical supply of at least one electromagnet (8) for generating a force (f) of magnetic attraction acting on an actuator body (4), and being characterised in that an objective value (&PHgr;c) of the magnetic flux (&PHgr;) circulatng in the magnetic circuit (18) formed by the electromagnet (8) and the actuator body (4) is determined and in that the electrical supply (i, v) of the electromagnet (8) is controlled as a function of the objective value (&PHgr;c) of the magnetic flux (&PHgr;), and wherein the objective value (&PHgr;c) of the magnetic flux (&PHgr;) is calculated as a function of an objective value (fobj) of the force (f) of magnetic attraction acting on the actuator body (4) and generated by the electromagnet (8), and whereinthe objective value (&PHgr;c) of the magnetic flux (&PHgr;) is calculated by applying the following equation: &varphi;c&it;â€ƒ&it;(t)=-2&CenterDot;fobj&it;â€ƒ&it;(t)(&PartialD;R&it;â€ƒ&it;(x&it;â€ƒ&it;(t))&PartialD;x)&varphi;in which: &PHgr;c(t) is the objective value of the magnetic flux (&PHgr;); fobj(t) is the objective value of the force (f) of magnetic attraction; x(t) is the position of the actuator body (4); R(x, &PHgr;) is the reluctance of the magnetic circuit (18).