Patent ID: 8489361
Filing Date: 2013-07-16
Classification: F02D

Abstract:
1. An exhaust gas sensor diagnostic device that diagnoses response of an exhaust gas sensor, which is provided to an exhaust gas flow passage of an internal combustion engine and which senses a gas state in the exhaust gas flow passage, the exhaust gas sensor diagnostic device comprising: a normal output estimating means for estimating a normal output of the exhaust gas sensor having normal response based on an operation state of the internal combustion engine; a lowered output estimating means for estimating a lowered output of the exhaust gas sensor having the response lowered by a predetermined value as compared to the exhaust gas sensor having normal response; an actual output sensing means for sensing an actual output of the exhaust gas sensor provided to the exhaust gas flow passage; an integrating means for calculating S a diagnosing means for diagnosing the response of the exhaust gas sensor based on S