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:
Jun. 21, 2011
Filed:
Oct. 31, 2007
Norio Suzuki, Saitama, JP;
Nobuhiro Komatsu, Saitama, JP;
Tomoko Morita, Saitama, JP;
Hisao Haga, Wako, JP;
Norio Suzuki, Saitama, JP;
Nobuhiro Komatsu, Saitama, JP;
Tomoko Morita, Saitama, JP;
Hisao Haga, Wako, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
An exhaust gas purifying device for an internal combustion engine, comprises: a first catalyst (TWC, example) having a reducing capability; a second catalyst (LNC, example) provided downstream of the first catalyst, the second catalyst is adapted to trap NOx in a lean condition of air fuel ratio of an exhaust gas and reduce the trapped NOx in a rich condition of air fuel ratio of the exhaust gas; and an exhaust air fuel ratio control means for controlling an exhaust air fuel ratio to decrease the NOx in the first and second catalysts, wherein the exhaust air fuel ratio control means conducts NOx decreasing control suitable for the first catalyst when the second catalyst is in an inactive state and the first catalyst is in an active state, and wherein the exhaust air fuel ratio control means conducts NOx decreasing control suitable for the second catalyst after the second catalyst is activated.