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:
Jun. 13, 2017
Filed:
Oct. 02, 2014
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Masahiro Kubo, Susono, JP;
Yasushi Iwasaki, Ebina, JP;
Kouichi Kitaura, Odawara, JP;
Hiroshi Miyamoto, Sizuoka-ken, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
An internal combustion engine comprises an exhaust purification catalyst which can store oxygen, controller for controlling the air-fuel ratio of exhaust gas to become a target air-fuel ratio, and a downstream side air-fuel ratio sensor. An abnormality diagnosis system performs an active air-fuel ratio control which alternately controls the target air-fuel ratio to rich and lean air-fuel ratios, and diagnoses abnormality of said exhaust purification catalyst based on the output air-fuel ratio of the air-fuel ratio sensor. The abnormality diagnosis system judges that the exhaust purification catalyst is abnormal when the output air-fuel ratio of the air-fuel ratio sensor reaches a rich judgment air-fuel ratio and a lean judgment air-fuel ratio during the active air-fuel ratio control, and judges that said air-fuel ratio control is abnormal when the output air-fuel ratio reaches only one of the rich and lean judgment air-fuel ratios.