Patent ID: 6321700
Filing Date: 2001-11-27
Classification: F01L,F02D

Abstract:
A method for operating an electromagnetically actuatable adjustment device, including an adjustment member connected to a connecting rod having at least one armature that is attached crosswise to its longitudinal axis, with the armature being moved between opposing pole surfaces of two electromagnets arranged at a distance to each other in an axial direction, two resetting springs that are effective in the axial direction connected to the connecting rod so that the armature is held in a center position between the electromagnets while the electromagnets are not supplied with current, and a path sensor element for detecting the position of at least one of the adjustment member and the armature, with the path sensor element being a coil disposed in an oscillator circuit and whose inductance is changed through a position change of the adjustment member;said method including: measuring the inductance of the coil by measuring the frequency of the oscillating circuit; and, based on the measured frequency, adjusting the current flow through the electromagnets such that at least one of the armature and the adjustment member move along a predetermined position/speed characteristic curve.