Scania Cv Ab

Anders Simon

Mikael Lundström

Ola Stenlåås

Mats HÄRDELIN

A method for cleaning an SCR system, wherein reducing agent is supplied to an exhaust flow upstream of an SCR catalyst (), NOcontents of the exhaust flow are determined upstream and downstream of the SCR catalyst () and reducing agent crystals are removed by a high-temperature procedure. The steps are determining (s) a ratio (K1) between NOcontents downstream and upstream of the SCR catalyst (), raising the temperature (s) of the exhaust flow to vaporize reducing agent crystals with a view to cleaning, determining (s) a ratio (Kn) between respective NOcontents determined downstream and upstream of the SCR catalyst () at a temperature (T2) of the SCR catalyst () at which reducing agent crystals vaporize, comparing (s) the ratios (K1, Kn) and using this comparison as a basis for deciding whether reducing agent crystals have been removed to an intended extent. Also a computer program product containing program code (P) for a computer () for implementing the method according to the invention. The invention relates also to a device and a motor vehicle equipped with the device.

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Södertälje, Sweden

Anders Simon