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:
Feb. 23, 2021
Filed:
Mar. 27, 2018
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Go Hayashita, Chigasaki, JP;
Kimikazu Yoda, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
The abnormality diagnosis system″ of an ammonia detection devicecomprises: an air-fuel ratio detection devicearranged in the exhaust passageat the downstream side of the catalyst; an air-fuel ratio control partconfigured to control an air-fuel ratio of exhaust gas; and an abnormality judgment partconfigured to judge abnormality of the ammonia detection device. The air-fuel ratio control part performs rich control making the air-fuel ratio of the inflowing exhaust gas richer than a stoichiometric air-fuel ratio. The abnormality judgment part judges that the ammonia detection device is abnormal if, after start of the rich control, an output value of the ammonia detection device does not rise to a reference value before the air-fuel ratio detected by the air-fuel ratio detection device falls to a rich judged air-fuel ratio richer than a stoichiometric air-fuel ratio.