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. 15, 2016
Filed:
Aug. 28, 2012
Kenji Sakurai, Gotenba, JP;
Kohki Nakamura, Ebina, JP;
Shigeki Nakayama, Gotenba, JP;
Kohei Yoshida, Gotenba, JP;
Yuki Bisaiji, Susono, JP;
Kenji Sakurai, Gotenba, JP;
Kohki Nakamura, Ebina, JP;
Shigeki Nakayama, Gotenba, JP;
Kohei Yoshida, Gotenba, JP;
Yuki Bisaiji, Susono, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
Abstract
The NOstorage catalyst and the NOselective reduction catalyst are arranged in the engine exhaust passage. In the engine low load operating region, a combustion is performed in the combustion chamber under a lean base air-fuel ratio and the air-fuel ratio in the combustion chamber is made rich when NOshould be released from the NOstorage catalyst. In the engine medium load operating region, the base air-fuel ratio is made smaller, a degree of richness of the air-fuel ratio is made smaller, and a period in which the air-fuel ratio is made rich is made shorter so that an amount of ammonia which is produced per unit time when the air-fuel ratio is made rich falls compared with the time of engine low load operation.