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:
Feb. 13, 2018
Filed:
Jun. 19, 2014
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi, JP;
Yuki Bisaiji, Mishima, JP;
Kohei Yoshida, Gotemba, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, Aichi, JP;
Abstract
An internal combustion engine in which a hydrocarbon feed valve, exhaust purification catalyst, and NOselective reduction catalyst are arranged in an engine exhaust passage. A first NOremoval method which injects hydrocarbons from the hydrocarbon feed valve within a predetermined range of period and uses the reducing intermediate which is generated due to this so as to reduce the NOcontained in the exhaust gas and a second NOremoval method which makes the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst rich with a period longer than this predetermined range are used. When the first NOremoval method should be used and the amount of adsorbed ammonia at the NOselective reduction catalyst is large, use of the first NOremoval method is stopped.