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:
Jun. 09, 2015
Filed:
Apr. 27, 2012
Tsuyoshi Kato, Kounan, JP;
Kentaro Mori, Nagoya, JP;
Soichi Kawaguchi, Inazawa, JP;
Yoshinori Hibino, Kasugai, JP;
Ryosuke Ichida, Komaki, JP;
Tsuyoshi Kato, Kounan, JP;
Kentaro Mori, Nagoya, JP;
Soichi Kawaguchi, Inazawa, JP;
Yoshinori Hibino, Kasugai, JP;
Ryosuke Ichida, Komaki, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
When a detection signal obtained from the cell of a gas sensor (S) has reached a start determination value (specifically, when the output voltage of the cell is higher than 600 mV (S: YES) or lower than 300 mV (S: YES)), a pulse voltage is applied to the cell (S), and a start-time internal resistance is obtained on the basis of the detection signal having changed as a result of application of the pulse voltage (S). The start-time internal resistance is compared with a deterioration determination value set in advance (S). A target resistance of the cell used in temperature control (energization control) for the heater is corrected in accordance with the result of the comparison (S). Thus, the temperature of the cell can be stably maintained constant irrespective of deterioration of the cell.