Patent ID: 7690193
Filing Date: 2010-04-06
Classification: B01D,F01N,Y02A,Y02T

Abstract:
1. A method of controlling a reducing agent generation system of an internal combustion engine, wherein a reagent substance is generated 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 with a catalytic converter model, the method comprising: modeling a reagent substance fill level of the SCR-catalytic converter; comparing the modeled reagent substance fill level with a storage set point with a closed-loop feedback control system; generating a reagent substance demand signal that at least releases a reagent substance pulse to temporarily increase the reagent substance fill level to a value greater than the storage set point when a difference between the storage set point and the reagent substance fill level exceeds a specified threshold value.