Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Eiichi Kitazawa0
Date of Patent
January 29, 2013
0Patent Application Number
125254080
Date Filed
January 25, 2008
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A trouble diagnosis device and method for an NOx sensor for determining abnormality of an NOx sensor used in an exhaust gas purification system. The device can perform a trouble diagnosis without forcedly creating a diagnosis mode during operation of an internal combustion engine and without deterioration of drivability or fuel consumption. The device detects the time-lapse variation of the exhaust NOx flow rate suitable for diagnosis in a normal operation mode and determines whether the NOx sensor responds with following this variation.
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