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:
Aug. 13, 2019
Filed:
Dec. 20, 2017
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
Abstract
A control for an internal combustion engine makes an air-fuel ratio in at least one of a plurality of cylinders equal to a rich air-fuel ratio smaller than a theoretical air-fuel ratio, makes an air-fuel ratio in each of the other remaining ones of the plurality of the cylinders equal to a lean air-fuel ratio larger than the theoretical air-fuel ratio, executes a temperature raising process for raising a temperature of a catalyst that purifies exhaust gas from the plurality of the cylinders, executes a detection process for detecting a degree of dispersion of the air-fuel ratio among the plurality of the cylinders, and executes a determination process for determining, based on the detected degree of dispersion, whether or not a plurality of fuel injection valves corresponding to the plurality of the cylinders respectively are normal, and executes the detection process while avoiding a period of the temperature raising process.