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. 23, 2001
Filed:
Jun. 05, 1998
Yoshihiro Tsuzuki, Handa, JP;
Fumiaki Arikawa, Okazaki, JP;
Nippon Soken, Inc., , JP;
Abstract
An electromagnetic apparatus for driving a valve such as an intake valve of an internal combustion engine drives the valve to its closing position without generating vibration and noises which are detrimental to durability and reliability of the valve. The valve speed is controlled either mechanically or electrically so that it is reduced to substantially zero when the valve sits on a valve seat. To mechanically control the valve speed, air or magnetic liquid is used as a cushion against the valve movement, or springs having a non-linear spring modulus such as a double-spring or a barrel spring are used to bias the valve movement. To electrically control the valve speed, an electrical signal representing the valve position is used to determine energization timing of the solenoids which drive the valve to an open or closing position. Such electrical signal is generated by an eddy current, resistance or spring load detector.