Scania Cv Ab

Magnus Fröberg

Mikael Lundström

Mikael Persson

Mohammed Adlouni

Anna Wingren

A method for troubleshooting in an SCR system which has a dosing unit () for dosing of reducing agent into an engine's exhaust duct () upstream of an SCR catalytic converter () for reduction of NOcontent in an exhaust flow from said engine and a DOC unit (). The method comprises steps of: determining (s) NOcontent in the exhaust flow downstream of said SCR catalytic converter (); determining satisfactory operation of said SCR catalytic converter (); progressively altering the dosage of said reducing agent; determining whether said SCR system can reduce NOcontent 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 () is faulty or not. Also disclosed is a computer program product having the program code (P) for a computer () 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.

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Hägersten, Sweden

Magnus Fröberg