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:
Nov. 13, 2012
Filed:
Jan. 29, 2008
Hiromasa Nishioka, Susono, JP;
Shinya Hirota, Susono, JP;
Kotaro Hayashi, Mishima, JP;
Takamitsu Asanuma, Mishima, JP;
Kohei Yoshida, Gotenba, JP;
Hiroshi Otsuki, Susono, JP;
Hiromasa Nishioka, Susono, JP;
Shinya Hirota, Susono, JP;
Kotaro Hayashi, Mishima, JP;
Takamitsu Asanuma, Mishima, JP;
Kohei Yoshida, Gotenba, JP;
Hiroshi Otsuki, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An SOtrap catalyst able to trap SOcontained in the exhaust gas is arranged in an engine exhaust passage upstream of an NOstoring catalyst in an internal combustion engine. When the SOtrap rate of the SOtrap catalyst falls, fuel is added in the exhaust gas flowing into the SOtrap catalyst to form in the SOtrap catalyst a region in which an air-fuel ratio becomes locally rich. SOreleased from the SOtrap catalyst in this region can be trapped in the SOtrap catalyst at the downstream side once again without flowing out from the downstream end of the SOtrap catalyst.