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:
Sep. 04, 2018
Filed:
Aug. 26, 2016
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Hiroshi Miyamoto, Susono, JP;
Tatsuhiro Hashida, Shizuoka-ken, JP;
Takahiko Fujiwara, Shizuoka-ken, JP;
Yasushi Iwazaki, Ebina, JP;
Toru Kidokoro, Hadano, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
The internal combustion engine comprises an exhaust purification catalyst, a downstream side sensor, an air-fuel ratio control unit, and an oxygen storage amount calculating unit for calculating the oxygen excess/deficiency of the inflowing exhaust gas in an air-fuel ratio maintenance time period and cumulatively adding the calculated oxygen excess/deficiency to calculate a maximum oxygen storage amount of the exhaust purification catalyst. The oxygen storage amount calculating unit uses a point of time that an absolute value of an output slope of the downstream side sensor finally becomes less than a threshold value in the air-fuel ratio maintenance time period as an end point of cumulative addition of the oxygen excess/deficiency. The threshold value is made larger when a maximum value of the absolute value of the output slope in the air-fuel ratio maintenance time period is relatively large compared to when the maximum value is relatively small.