Patent ID: 6141201
Filing Date: 2000-10-31
Classification: F01L,H01F

Abstract:
A method of regulating an electromagnetic actuator having an electromagnet provided with a pole face and having a magnet coil; an armature movable, in a switching step, by a controlled current supply to said magnet coil, from a first armature position to a second, pole face-engaging armature position against a force of a resetting spring; the method comprising the following steps for regulating the current flow through the magnet coil to set a low velocity of the armature as it arrives at the pole face:(a) during the switching step, detecting the energy amount in the electromagnetic actuator by detecting at least one of a changing armature position and a changing armature velocity;(b) estimating by extrapolation the expected energy amount upon arrival of the armature on the pole face; and(c) forming a coarse correcting value by comparing the estimation to be extrapolated with a predetermined target value selected with an aid of the total energy stored in the system in said second armature position.