A method and a system for evaluating an effective component content of a reducing agent

摘要

The invention relates to a method for evaluating an effective component content (C) of a reducing agent for engine exhaust gas processing arranged in a container (205) in which a heat transfer provision arrangement (240) is provided, comprising the steps of: - determining (s410; s420) a prevailing volume (V) and temperature (T1) of said reducing agent in said container (205); - determining (s430) a prevailing temperature (T2) of said heat transfer provision arrangement (240); - determining (s440) a prevailing temperature (T3) of a medium surrounding said container (205); - for a predetermined time period, determining (s450) a mean temperature change rate (Tprim) for said reducing agent; and - determining (s460) said effective component content (C) of said reducing agent on the basis of the above determined parameters.