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:
Apr. 16, 2024
Filed:
Dec. 21, 2020
Ngk Insulators, Ltd., Aichi, JP;
Yusuke Watanabe, Nagoya, JP;
Takayuki Sekiya, Nagoya, JP;
NGK INSULATORS, LTD., Nagoya, JP;
Abstract
In a gas sensor, oxygen pumping control is performed to pump oxygen from the surroundings of an outer side pump electrode into the surroundings of a reference electrode. In addition, during execution of the oxygen pumping control, a pump current Ipis measured when oxygen originating from NOx is pumped out from the surroundings of a measurement electrode so that a voltage Vreaches a target voltage V*. Then, the NOx concentration of a measurement-object gas is calculated based on Ip. In the gas sensor, the NOx concentration is corrected based on DVref which is the difference between Vrefand Vref, wherein Vrefis the voltage across the reference electrode and the outer side pump electrode when the oxygen pumping control is not performed, and Vrefis the voltage across the reference electrode and the outer side pump electrode when the oxygen pumping control is performed.