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. 17, 2020
Filed:
May. 31, 2018
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Kenji Inoshita, Okazaki, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
The exhaust purification system of an internal combustion engine has: exhaust purification catalystsarranged in an exhaust passage and able to store oxygen; and a control devicefor calculating an EGR rate of intake gas supplied to combustion chambersand for controlling an air-fuel ratio of the exhaust gas flowing into the catalysts. The control device alternately switches the air-fuel ratio between a rich air-fuel ratio and a lean air-fuel ratio, and controls the air-fuel ratio so that the air-fuel ratio is switched from the lean air-fuel ratio to the rich air-fuel ratio when the oxygen storage amount of the catalyst is greater, when the calculated EGR rate is relatively high, compared to when it is relatively low.