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:
Sep. 30, 2003
Filed:
Dec. 05, 2000
Akihiro Yanai, Toyota, JP;
Mitsugu Makita, Nagoya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An electromagnetic valve drive apparatus of an internal combustion engine has a three-switching element in-series type drive circuit. Through switching operations of switching elements that are shared by eight electromagnetic coils consisting of upper coils and lower coils of four valves. The four valves include a first two valves that perform identical operations and a second two valves whose open period does not overlap the open period of the first two valves. The three-switching element in-series type drive circuit is able to supply current and to rapidly reduce, or discontinue, current through the electromagnetic coils. The electromagnetic valve drive apparatus is able to control the quantity of current through the electromagnetic coils while reducing the number of switching elements employed.