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. 25, 2017
Filed:
Nov. 14, 2013
Ngk Spark Plug Co., Ltd., Nagoya, Aichi, JP;
NGK SPARK PLUG CO., LTD., Nagoya, JP;
Abstract
An NOdetection apparatus computes a first NOconcentration NOon the basis of a second pumping current Ip2, and sets correction coefficients a, b (concentration variation correction information) on the basis of the first NOconcentration NO. Therefore, the NOdetection apparatus can set the correction coefficients a, b in accordance with the concentration of NOactually contained in a to-be-measured gas. Since the NOdetection apparatus uses Equation 3, determined by the correction coefficients a, b, for correction of the first NOconcentration NO, the NOdetection apparatus can correct the first NOconcentration NOin accordance with the state of change of the NOconcentration even when the magnitude of an output variation caused by a pressure change changes depending on the NOconcentration.