US Patent 7160435 Gas sensor and method for controlling the same

Patent 7160435 was granted and assigned to NGK Insulators on January, 2007 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

NGK Insulators

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7160435

Date of Patent

January 9, 2007

Patent Application Number

10608084

Date Filed

June 27, 2003

Patent Primary Examiner

‌

Kaj K. Olsen

Patent abstract

Disclosed is a gas sensor for controlling a concentration of oxygen and/or measuring NOx by allowing a current to flow through an ion-conductive member for conducting oxygen ion, by the aid of a current supply circuit, wherein the current, which is outputted from the current supply circuit, has a pulse waveform (current signal) having a constant crest value, and the current supply circuit comprises a rectangular wave-generating circuit for controlling a frequency of the current signal on the basis of an electromotive force generated in the ion-conductive member to which the current signal is supplied. Accordingly, it is possible to highly accurately measure the predetermined gas component while scarcely being affected by the electric noise or the like.