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:
Apr. 15, 2003
Filed:
Dec. 04, 2000
Ikuhiro Taniguchi, Kanagawa, JP;
Taketoshi Kawabe, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A control system for an electromagnetic actuator actuates an intake or exhaust valve. The actuator includes first and second electromagnets which develop an electromagnetic attraction force the strengths of which depend on the amount of current supplied thereto. A spring biases an armature between the electromagnets to a neutral position therebetween. The control system comprises a control circuit which (a) controls the amount of current supplied to the first electromagnet thereby restricting a moving velocity of the armature, at a first stage in a course of changing the armature from a first position to a second position; and (b) supplies current to the second electromagnet at a timing at which the armature approaches the second electromagnet upon the biasing force of the spring thereby attracting the armature to the second position, at a second stage in the course of changing the armature from the first position to the second position.