Procedure and device to control a reducing agent generation system

摘要

A method of controlling a reducing agent generation system of an internal combustion engine includes generating a reagent substance in a form of pulses and delivered to an exhaust gas duct of the internal combustion engine upstream of an SCR-catalytic converter for the selective catalytic reduction of the nitrogen oxides contained in an exhaust gas. A catalytic converter model is used to model a reagent substance fill level of the SCR-catalytic converter and a closed-loop feedback control system compares the modeled reagent substance fill level with a storage set point. A reagent substance demand signal is generated that at least releases a reagent substance pulse when a difference between the storage set point and the reagent substance fill level exceeds a specified threshold value.