Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 4, 2011
Patent Application Number
11777902
Date Filed
July 13, 2007
Patent Citations Received
Patent Primary Examiner
Patent abstract
A method of monitoring a performance of an oxygen sensor is disclosed. One embodiment comprises determining a first air/fuel ratio from a signal from an exhaust oxygen sensor; determining a second air/fuel ratio from a temperature upstream of the particulate filter, a pressure differential across the particulate filter and one or more of an airflow into the engine and a fuel flow into the engine; comparing the first air/fuel ratio and the second air/fuel ratio; and diagnosing an error condition of the oxygen sensor if the first air/fuel ratio does not meet a predetermined condition relative to the second air/fuel ratio.
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