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. 30, 1998
Filed:
Apr. 15, 1996
Nobuhide Kato, Aichi-ken, JP;
Noriyuki Ina, Okazaki, JP;
NGK Insulators, Ltd., , JP;
Abstract
A system for detecting deterioration of an exhaust gas control catalyst provided in an exhaust gas passage through which a combustion exhaust gas is discharged, including a processing zone communicating with a portion of the passage which is downstream of the catalyst and a pumping cell including an oxygen ion conductive solid electrolyte layer and a pair of electrodes one of which is exposed to the processing zone, wherein the pumping cell pumps oxygen out of the processing zone so as to control oxygen partial pressure in the processing zone which corresponds to a monitor voltage, at a value at which the combustible gas component within the processing zone cannot be burned, and the oxygen concentration in the combustion exhaust gas is obtained based on a pumping current flowing between the pair of electrodes of the pumping cell, whereby the degree of deterioration of the catalyst is determined on the basis of the obtained oxygen concentration.