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. 11, 2011
Filed:
Mar. 23, 2007
Kohei Yoshida, Gotenba, JP;
Kotaro Hayashi, Mishima, JP;
Kohei Yoshida, Gotenba, JP;
Kotaro Hayashi, Mishima, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An internal combustion engine wherein an SOtrap catalyst () able to trap SOcontained in exhaust gas is arranged in an engine exhaust passage upstream of an NOstoring catalyst (). When the air-fuel ratio of the exhaust gas flowing into the SOtrap catalyst () is switched from lean to rich to make the NOstoring catalyst () release the NO, if the temperature of the SOtrap catalyst () is the SOrelease lower limit temperature or more, rich processing making the air-fuel ratio of the exhaust gas flowing into the SOtrap catalyst () rich for making the NOstoring catalyst () release NOis prohibited.