Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 5, 2013
Patent Application Number
13008937
Date Filed
January 19, 2011
Patent Citations Received
Patent Primary Examiner
Patent abstract
A method for monitoring performance of a passive selective catalytic reduction system includes operating the internal combustion engine in a preconditioning mode. Subsequent to the preconditioning, an air/fuel excursion is introduced into the exhaust gas feedstream and a signal output from a sensor monitoring the exhaust gas feedstream in the selective catalytic reduction system during the air/fuel excursion is monitored. An operating effectiveness is determined for the selective catalytic reduction system correlated to the signal output from the sensor monitoring the exhaust gas feedstream.
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