The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 09, 2013
Filed:
Sep. 10, 2009
Michael Pantke, Friedrichshafen, DE;
Jorg Kurth, Meckenbeuren, DE;
Michael Pantke, Friedrichshafen, DE;
Jorg Kurth, Meckenbeuren, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A method of detecting the position of the armature () of an electromagnetic actuator arranged and able to move between first and second coils (), in which a voltage jump (U) is applied to the first and the second coils () of the actuator connected in series. The first and the second coils () form a voltage divider in accordance with the impedance coil principle. The voltage (U) of the first coil () and the voltage (U) of the second coil () are measured and, from the measurement data for the voltages at the first and the second coils (), the quotient of the difference (ΔU) between the two voltage values and the voltage jump (U), normalized in relation to the size of the voltage jump (U) is calculated, and a specific armature stroke is correlated one-to-one with each value of the quotient.