Method for operating an exhaust gas aftertreatment system of an internal combustion engine, exhaust gas aftertreatment system for an internal combustion engine and internal combustion engine with such an exhaust gas aftertreatment system

摘要

Method for operating an exhaust gas aftertreatment system (3) of an internal combustion engine (1), wherein - during operation of the exhaust gas aftertreatment system (3) at least one operating parameter is recorded which is related to an oxidation state of an SCR catalyst material of the exhaust gas aftertreatment system (3), depending on at least one measure to prevent a progressive reduction of the SCR catalyst material and / or at least one reoxidation measure to reoxidize the SCR catalyst material is / are initiated, characterized in that the oxidation state of the SCR catalyst material is determined by means of a catalyst reaction model the at least one operating parameter is fed as an input variable to the catalyst reaction model, and wherein - the at least one measure to prevent a progressive reduction of the SCR catalyst material and / or the at least one Re oxidation measure is initiated depending on the oxidation state determined by the catalyst reaction model.