Anordning och förfarande för att avgöra funktion hos en sensor för fastställande av halt av en komponent hos avgaser från en motor

摘要

The invention relates to a method to determine the function of a sensor (235; 245; 255; 265) arranged to determine the level of a component in the exhaust gases from an engine (206), comprising the following steps: - to expose (s420; s450) the said sensor (235; 245; 255; 265) to a reference gas, other than the said exhaust gases, with a known level (Ref 1 NOx; Ref 1 Ox) of the said component; - to determine (s430; s460) a level (HmeasNox; HmeasOx) of the said component in the said reference gas by means of the said sensor (235; 245; 255; 265); - to compare (s440; s470) the level (HmeasNox; HmeasOx) determined in this way with the said known level (Ref 1 NOx; Ref 1 Ox) with respect to the said component; and - to assess the said function on the basis of the result of the said comparison. The invention concerns also a computer program product comprising program code (P) for a computer (200; 210) to implement a method according to the invention. The invention concerns also an arrangement to determine the function of a sensor (235; 245; 255; 265) arranged to determine the level of a component in the exhaust gases from an engine (206) and a motor vehicle (100) that is equipped with the arrangement.