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:
Jan. 13, 1998
Filed:
Aug. 22, 1996
Ekkehard Schrey, Aachen, DE;
FEV Motorentechnik GmbH & Co. KG, Aachen, DE;
Abstract
A method of controlling an electromagnetic actuator having at least one electromagnet and an armature that can be moved by generated magnetic forces in a direction counter to the force of a restoring spring associated with the electromagnet, with the armature acting on a control element. The supply of current to the electromagnet in order to initiate the armature movement is effected by a linear regulator that regulates the coil current to a constant value, via a control member, prior to the anticipated impact of the armature on the pole face of the electromagnet. An identifying signal for armature impact is derived from changes in the control variable of the regulator (control current or control voltage) when the armature impacts during the constant-current phase.