The present invention corrects the parameters of the selective reduction method of determining the correction logic for the response model of the catalyst, selective reaction model of the reduction catalyst for correcting the parameters of the reaction model through the sensitivity analysis of a reaction model that defines the reaction of selective reduction catalyst how to do this and to take advantage in the exhaust system.
Selective Catalytic Reduction (Selective Catalytic Reduction; SCR) reaction model of the catalyst is defined by the m number of parameters, m has a smaller n input variables. Reaction of the SCR catalyst model is to predict a concentration of NOx in the SCR catalyst, at least the rear end.