Anordning och förfarande för felsökning vid ett SCR-system

A method for troubleshooting in an SCR system which has a dosing unit (250) for dosing of reducing agent into an engine's exhaust duct (290) upstream of an SCR catalytic converter (270) for reduction of NOx content in an exhaust flow from said engine and a DOC unit (259). The method comprises s...

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Bibliographische Detailangaben
Hauptverfasser:	MAGNUS FRÖBERG, MIKAEL LUNDSTRÖM
Format:	Patent
Sprache:	swe
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 LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	A method for troubleshooting in an SCR system which has a dosing unit (250) for dosing of reducing agent into an engine's exhaust duct (290) upstream of an SCR catalytic converter (270) for reduction of NOx content in an exhaust flow from said engine and a DOC unit (259). The method comprises steps of: determining (s310) NOx content in the exhaust flow downstream of said SCR catalytic converter (270); determining satisfactory operation of said SCR catalytic converter (270); progressively altering the dosage of said reducing agent; determining whether said SCR system can reduce NOx content of the exhaust flow downstream of said SCR catalytic converter to a predetermined extent during altered dosing; using the results of determinations as a basis for deciding whether said DOC unit (259) is faulty or not. Also disclosed is a computer program product having the program code (P) for a computer (200; 210) for implementing the method according to the invention. Also disclosed is a device for troubleshooting in an SCR system and to a motor vehicle equipped with the device.