Reducing agent e.g. urea, production device activating method for internal combustion engine, involves adjusting minimum value of mass flow of transported air during temperature raised phase, where value prevents inflow of exhaust gas

摘要

The method involves delivering a substance in form of a pastille to a reactor (10) by transported air current, where the substance exerts an ammonium separation effect. A reducing agent production device is activated in a temperature raised phase. A minimum value of mass flow of transported air is adjusted during the temperature raised phase, where the presence of the minimum value prevents inflow of exhaust gas in a supply conduit (40). The supply conduit is closed by an isolation unit.