Patent ID: 6518748
Filing Date: 2003-02-11
Classification: F01L,H01F

Abstract:
A method for determining the position of an armature associated with an electromechanical actuating drive, the actuating drive having a first contact surface and at least one electromagnet with a coil and a second contact surface, the armature having an armature plate movably disposed between the first contact surface and the second contact surface, the method which comprises:determining a mean value of a measured voltage drop across a coil in an operating state in which a substantially constant current is flowing through the coil; determining a resistance of the coil as a function of the mean value of the measured voltage drop and the current through the coil; determining an inductive voltage drop across the coil from a difference between the measured voltage drop across the coil minus a voltage drop obtained by multiplication of the resistance of the coil by the current through the coil; determining a magnetic flux by integration of the inductive voltage drop across the coil; and determining a position of an armature as a function of the magnetic flux and the current through the coil.