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:
Jan. 03, 2017
Filed:
Aug. 28, 2012
Mikio Inoue, Susono, JP;
Kohei Yoshida, Gotenba, JP;
Yuki Bisaiji, Mishima, JP;
Kenji Sakurai, Gotenba, JP;
Kohki Nakamura, Ebina, JP;
Mikio Inoue, Susono, JP;
Kohei Yoshida, Gotenba, JP;
Yuki Bisaiji, Mishima, JP;
Kenji Sakurai, Gotenba, JP;
Kohki Nakamura, Ebina, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi, JP;
Abstract
A three-way catalyst () having an oxygen storage function and an exhaust purification catalyst () are arranged in the exhaust passage of an internal combustion engine. During medium-load operation of the engine the degree of lean of the air-fuel ratio in the combustion chamber () is increased so as to increase the oxygen storage amount of the three-way catalyst () to the maximum oxygen storage amount, and the air-fuel ratio in the combustion chamber () even after the oxygen storage amount of the three-way catalyst () has reached the maximum oxygen, storage amount is maintained at lean, after which the air-fuel ratio is returned to rich, and at this time, as the amount of poisoning of a noble metal catalyst when the air-fuel ratio in the combustion chamber () is rich increases, the amount of time for which the air-fuel ratio in the combustion chamber () is maintained at lean is increased.