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:
Dec. 22, 2009
Filed:
Feb. 19, 2008
Reina Fukagai, Aichi, JP;
Norikazu Ieda, Ichinomiya, JP;
Masahiro Tanaka, Kasugai, JP;
Hiroshi Inagaki, Komaki, JP;
Masaki Hirata, Hamamatsu, JP;
Takahiro Suzuki, Hamamatsu, JP;
Reina Fukagai, Aichi, JP;
Norikazu Ieda, Ichinomiya, JP;
Masahiro Tanaka, Kasugai, JP;
Hiroshi Inagaki, Komaki, JP;
Masaki Hirata, Hamamatsu, JP;
Takahiro Suzuki, Hamamatsu, JP;
NGK Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Suzuki Motor Corporation, Hamamatsu-shi, Shizuoka, JP;
Abstract
A gas sensor diagnostic method (or apparatus) is arranged to periodically obtain sensor output values of a gas sensor such as an oxygen sensor for an internal combustion engine, and to determine local extreme values from the sensor output values obtained during a period of interruption of fuel supply to the engine. Moreover, the local extreme values are compared with a first predetermined threshold level. When the number of the local extreme values reaches a predetermined first number, a diagnosis is performed to determine whether the gas sensor is in an improper condition or not, in accordance with results of the comparison of the local extreme values with the first threshold level.