Engine emmissions control methods and systems

Methods and systems are provided for operating an engine of a vehicle. In one example, a method may include positioning an oxygen sensor in an engine exhaust downstream from a selective catalytic reduction (SCR) catalyst, determining an oxygen storage capacity of the SCR catalyst based on a measurem...

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Bibliographische Detailangaben
Hauptverfasser: Cavataio, Giovanni, Getsoian, Andrew, Uhrich, Michael, Wu, Jason
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:Methods and systems are provided for operating an engine of a vehicle. In one example, a method may include positioning an oxygen sensor in an engine exhaust downstream from a selective catalytic reduction (SCR) catalyst, determining an oxygen storage capacity of the SCR catalyst based on a measurement of the oxygen sensor, and determining an extent of deactivation of the SCR catalyst based on the oxygen storage capacity.