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. 16, 2021
Filed:
Sep. 25, 2018
Ngk Spark Plug Co., Ltd., Nagoya, JP;
Yoshihiro Nakano, Komaki, JP;
NGK Spark Plug Co., LTD., Nagoya, JP;
Abstract
A sensor control apparatus supplies a constant current to an oxygen concentration detection cell when it judges that oxygen concentration is greater than 15% (the concentration of oxygen contained in a measurement chamber is high). The sensor control apparatus detects a first difference voltage generated in the oxygen concentration detection cell as a result of the flow of the constant current to the oxygen concentration detection cell after a predetermined first detection time following the supply of the constant current. The sensor control apparatus detects a second difference voltage generated in the oxygen concentration detection cell as a result of the flow of the constant current to the oxygen concentration detection cell after a second detection time, which is previously set to be longer than the first detection time, following the supply of the constant current.