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. 01, 2002
Filed:
Dec. 02, 1999
Hiroyuki Hattori, Toyota, JP;
Takashi Izuo, Toyota, JP;
Masahiko Asano, Toyota, JP;
Tatsuo Iida, Toyota, JP;
Shoichiro Nitta, Nishikamo-gun, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An electromagnetic actuating system having a valve member is provided. This system can improve a response of movement of the valve member while reducing power consumption of the system. The electromagnetic actuating system includes an armature which moves with the valve member, an electromagnet which attracts the armature in a direction of movement of the valve member by being supplied with a current, and a spring which presses the armature away from the electromagnet. A permanent magnet which can exert a magnetic attracting force between the armature and the electromagnet is provided. A current controller supplies a release current to the electromagnet so that magnetic flux is generated in a direction opposite to a direction of magnetic flux generated by the permanent magnet when the armature is released from the electromagnet. The valve member functions as an intake valve or an exhaust valve of an internal combustion engine, and the current controller controls an amount of the release current in accordance with an operating state of the internal combustion engine.