METHOD PERTAINING TO AN SCR-SYSTEM, AND AN SCR-SYSTEM

摘要

The invention relates to a method, in an SCR system in which reducing agent is supplied to an exhaust flow upstream of an SCR catalyst (260), for deciding whether a NOx sensor (245; 255) is situated in the exhaust duct (241; 251 ) of an engine (240) for NOx measurement according to an intended measuring configuration. The method comprises the steps of using said NOx sensor (245; 255) to measure an oxygen content (Oxmeas) at the NOx sensor's measuring position, and deciding on the basis of the measured oxygen content (Oxmeas) whether said measuring position corresponds to the intended measuring configuration. The invention relates also to a computer programme product comprising programme code (P) for a computer (200; 210; 500) for implementing a method according to the invention. The invention relates also to an SCR system and a motor vehicle (100, 110) which is equipped with the SCR system.