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:
Mar. 29, 2016
Filed:
Mar. 13, 2012
Hirotaka Onogi, Kakamigahara, JP;
Kenji Kato, Nagoya, JP;
Satoshi Teramoto, Nisshin, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A sensor control apparatus is disclosed, including a preliminary control for supplying a constant current to a second oxygen pump cell of a gas sensor for a constant period of time so as to control to a constant level the amount of oxygen pumped out from a second measurement chamber (Sto S). At the beginning of drive control (Sto S), oxygen is pumped back into the second measurement chamber. During the pumping back operation, an NOconcentration correspondence value has a large time course change and is not stable. The NOconcentration correspondence value is corrected using correction data common among gas sensors, wherein the timing for applying the correction data is adjusted by making use of an application time determined in accordance with individual differences of each gas sensor.