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:
Jan. 15, 2019
Filed:
Nov. 09, 2015
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Go Hayashita, Chigasaki, JP;
Hidenori Moriya, Nagoya, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, JP;
Abstract
An abnormality diagnosis system of an air-fuel ratio sensororprovided in an exhaust passage of an internal combustion engine and generating a limit current corresponding to an air-fuel ratio, comprises a current detecting partdetecting an output current of the air-fuel ratio sensor and an applied voltage control devicecontrolling a voltage applied to the air-fuel ratio sensor. The abnormality diagnosis system applies a voltage inside a limit current region where a limit current is generated and a voltage outside the limit current region to the air-fuel ratio sensor when the air-fuel ratio of the exhaust gas circulating around the air-fuel ratio sensor is made a predetermined constant air-fuel ratio, and judges a type of abnormality occurring at the air-fuel ratio sensor based on an output current of the air-fuel ratio sensor detected by the current detecting part at this time.