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:
Mar. 06, 2001
Filed:
Jul. 19, 1999
Ralf Cosfeld, Munich, DE;
Konrad Reif, Oberschleissheim, DE;
Bayerische Motoren Werke Aktiengesellschaft, Munich, DE;
Abstract
The invention relates to a method for controlling the movement of an armature of an electromagnetic actuator, particularly for operating a charge cycle lifting valve of an internal-combustion engine, the armature being moved in an oscillating manner between two solenoid coils in each case against the force of at least one restoring spring by the alternating energizing of the solenoid coils, and, with an approach of the armature to the first-energized coil, during the so-called capturing operation, the electric voltage being reduced which is applied to the coil capturing the armature. The capturing phase of the capturing operation is followed by a braking phase in which, until the armature impacts on the coil, an electric voltage is applied to the latter in a switched manner, the respective switching points in time and the voltage switching ratio being determined by a controller by means of a desired trajectory describing the desired armature movement. Preferably, a positive or negative voltage value, whose amount is constant, or the “zero” voltage value is applied in a switched manner to the coil capturing the armature.