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:
Aug. 01, 2017
Filed:
Jun. 30, 2014
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A gas sensor controller () controls a gas sensor element () which has a first pump cell (), a second pump cell (), and an oxygen concentration detection cell (). The controller includes first chamber control means () to () which pumps oxygen out of or into a first measurement chamber MRsuch that a concentration voltage Vs becomes equal to a target voltage Vr; target voltage changing means S, Swhich changes the target voltage Vr from a first target voltage Vrto a second target voltage Vr; current detection means () which detects the magnitude of a concentration current Ipflowing between first electrode () and second electrode (); and deterioration determination means Swhich determines the deterioration state of the gas sensor element from a change which occurs in the concentration current Ipdue to the change in the target voltage Vr.