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. 16, 2021
Filed:
Sep. 30, 2020
Ngk Spark Plug Co., Ltd., Nagoya, JP;
Tetsuya Ito, Nagoya, JP;
Yuki Saito, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
An air-fuel ratio control system () including an air-fuel ratio control section () for controlling the air-fuel ratio λ of an air-fuel mixture, an exhaust gas purifier (); an air-fuel ratio sensor () whose output changes sharply when λ in the exhaust gas changes between rich and lean sides about a stoichiometric air-fuel ratio; a heater (); and a temperature control section (). The air-fuel ratio control section () controls λ based on the output of the air-fuel ratio sensor () using, as a target air-fuel ratio, a predetermined air-fuel ratio such that 0.980≤λ<1.000 is satisfied, and when a change amount Δλ λ is 0.008, an output difference ΔV is 150 mV or smaller. The temperature control section () controls the temperature of the air-fuel ratio sensor () to a predetermined target temperature of 650° C. or higher.