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:
Oct. 30, 2012
Filed:
Mar. 19, 2008
Kenichi Tsujimoto, Susono, JP;
Shinya Hirota, Susono, JP;
Kenichi Tsujimoto, Susono, JP;
Shinya Hirota, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In an internal combustion engine, a pair of NOstoring catalysts are arranged in series in an engine exhaust passage. When causing the upstream NOstoring catalyst to release NOand store the released NOin the downstream NOstoring catalyst, the oxygen concentration in the exhaust gas is temporarily reduced in a state where the exhaust gas is maintained at a lean air-fuel ratio. As opposed to this, when releasing NOfrom the upstream NOstoring catalyst and the downstream NOstoring catalyst and reducing the NO, the air-fuel ratio of the exhaust gas is temporarily switched from lean to rich.