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:
Nov. 27, 2001
Filed:
Mar. 23, 2000
Guido Kurth, Meerbusch, DE;
Pierburg AG, Neuss, DE;
Abstract
Apparatus for determining whether an electromagnetic valve is operating properly wherein an armature of the valve carries an annular magnet facing a Hall-effect sensor switch which is exposed to the magnetic field of the magnet when the armature is in a home position. If the armature is not shifted from its home position when the valve is energized, this malfunction of the valve is detected by an evaluation unit connected in series to the output of the Hall-effect sensor switch. Below the Hall-effect sensor switch a short circuit ring is attached, at a well defined stroke position relative to the magnet, in order to ensure that the magnetic field of the magnet does not influence the working capability of the valve during proper operation. The output of the evaluation unit can be connected to a visual display device.