Patent ID: 7053604
Filing Date: 2006-05-30
Classification: F01L

Abstract:
1. A sensor for detecting movement of a control element moved by an actuator, comprising: a fixed coil arrangement having at least one coil connected to a current supply and to a signal detection device, the at least one coil comprising an active coil having outer end regions and first and second short passive coils arranged in each of the outer end regions; a housing circumferentially enclosing the fixed coil arrangement, the housing comprising a magnetically conductive material with poor electrical conductivity; an axially movable rod-shaped sensor element comprised of a magnetizable material connected to the control element, the magnetizable material being electrically poorly conductive; and a short circuit element disposed on the rod-shaped element, delimited in a longitudinal direction of the rod-shaped sensor by two outer edge regions and comprising an electrically conductive material with low ohmic resistance, the short circuit element being dimensioned so that during movement within a stroke region of the control element, only the electrically poorly conductive material of the rod-shaped element will sweep across one of the first and second passive coils, while only the electrically conductive material of the short circuit element will sweep across the other of the first and second passive coils.