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:
Feb. 03, 2015
Filed:
Mar. 31, 2010
Yutaka Yonekawa, Kariya, JP;
Tomoaki Nakano, Toyota, JP;
Yutaka Yonekawa, Kariya, JP;
Tomoaki Nakano, Toyota, JP;
Denso Corporation, Kariya, JP;
Abstract
An exhaust gas purifying apparatus for an internal combustion engine includes a lean control unit and a rich control unit. The lean control unit executes lean spike operation, in which an air-fuel ratio is temporarily changed in a lean direction by a lean change width relative to a reference air-fuel ratio. The rich control unit changes the air-fuel ratio in a rich direction by a rich change width relative to the reference air-fuel ratio after the lean control unit executes the lean spike operation such that the air-fuel ratio stays in a predetermined slightly rich region. The rich change width is smaller than the lean change width.