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:
Jan. 28, 2020
Filed:
Jan. 12, 2018
Ngk Insulators, Ltd., Nagoya-shi, Aichi, JP;
Kosuke Monna, Frankfurt am Main, DE;
Taku Okamoto, Nagoya, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
A method of diagnosing a degree of degradation of a catalyst located along an exhaust path of an internal combustion engine, and oxidizing or adsorbing a target gas included in an exhaust gas and including at least one of HC and CO is disclosed. The method includes: a) determining whether an oxygen concentration of the exhaust gas is in a range of 15% to 20% or whether the oxygen concentration is 10% or more and varies in a range of ±2% or less of a predetermined value in a predetermined period of time; and b) diagnosing whether the catalyst is degraded when criteria in the step a) are satisfied. The step b) is performed by comparing a diagnostic indicator value calculated using an output value from a target gas detection component provided at a location downstream from the catalyst and a threshold corresponding to temperature of the catalyst.