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:
Dec. 25, 2012
Filed:
Nov. 11, 2008
Koichiro Nakatani, Mishima, JP;
Terutoshi Tomoda, Mishima, JP;
Shinobu Ishiyama, Numazu, JP;
Tomoyuki Ono, Sunto-gun, JP;
Tomoyuki Kogo, Gotenba, JP;
Katsuhiro Ito, Mishima, JP;
Masayoshi Nakagawa, Gotenba, JP;
Yoshihiro Hisataka, Fujinomiya, JP;
Koichiro Nakatani, Mishima, JP;
Terutoshi Tomoda, Mishima, JP;
Shinobu Ishiyama, Numazu, JP;
Tomoyuki Ono, Sunto-gun, JP;
Tomoyuki Kogo, Gotenba, JP;
Katsuhiro Ito, Mishima, JP;
Masayoshi Nakagawa, Gotenba, JP;
Yoshihiro Hisataka, Fujinomiya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An object of the present invention is to provide a technology that enables reduction of NOx stored in an NOx catalyst with improved efficiency in an exhaust gas purification system for an internal combustion engine. According to the present invention, when NOx stored in the NOx catalyst is to be reduced, if the temperature of the NOx catalyst is lower than a specific temperature, the air-fuel ratio of the ambient atmosphere around the NOx catalyst is decreased only by decreasing the air-fuel ratio of the exhaust gas discharged from the internal combustion engine, and if the temperature of the NOx catalyst is not lower than the specific temperature, the air-fuel ratio of the ambient atmosphere around the NOx catalyst is decreased either only by adding reducing agent through reducing agent addition means, or by decreasing the air-fuel ratio of the exhaust gas discharged from the internal combustion engine and adding reducing agent through the reducing agent addition means.