Aftertreatment diagnostic system

A controller 140 to diagnose a selective catalytic reduction (SCR) system 123 of an aftertreatment system 120 executes computer-readable instructions to determine a first NOx value at an outlet of the SCR system (e.g. using a NOx sensor 128), determine an ammonia (NH3) slip value based at least in p...

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Bibliographische Detailangaben
Hauptverfasser:	Ajita Gupta, Arun Shori Sundaravel Damotharan, Rakesh Mohanty, Jinqian Gong, Michael Haas
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LIGHTING MACHINES OR ENGINES IN GENERAL MEASURING MECHANICAL ENGINEERING PHYSICS STEAM ENGINES TESTING WEAPONS
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Beschreibung
Zusammenfassung:	A controller 140 to diagnose a selective catalytic reduction (SCR) system 123 of an aftertreatment system 120 executes computer-readable instructions to determine a first NOx value at an outlet of the SCR system (e.g. using a NOx sensor 128), determine an ammonia (NH3) slip value based at least in part on the first NOx value, determine a second NOx value of a healthy SCR model, determine a third NOx value of a degraded SCR model, compute at least one degradation factor based on the ammonia slip, and the first, second and third NOx values, and diagnose a normal operation or an abnormal operation of the SCR system based on the at least one degradation factor. The calculated degradation factor(s) may be sorted into a plurality of weight factor bins after a sampling period, a total count determined in each bin and the operation of the system determined based on the total count.