METHOD FOR PREDICTING REGENERATION OF DeNOx CATALYST AND EXHAUST SYSTEM USING THE SAME

Amount of reducing agent present invention is accurate prediction method of predicting a reproduction of the NOx reduction catalyst, and by using this, when playback of the NOx reduction catalyst and the injection amount of the amount of nitrogen dioxide of the remaining nitrogen oxides after the reproduction of the reducing NOx catalyst the present invention relates to an exhaust apparatus to control. Reproduction predicting method in the NOx reduction catalyst according to an embodiment of the present invention comprises the steps of calculating the total mass flow rate of the reducing agent; The step of using the total reducing agent mass flow rate of the reducing agent calculated mass flow rate, mass flow rate of the reducing agent, and then simply reducing the mass flow rate to be used for oxidation-reduction reaction of nitrogen dioxide used for the nitrate reduction reaction; Calculating a reductant mass flow rate of the mass flow rate of nitrogen dioxide and nitrous oxide are reduced and the mass flow of the desorbed nitrogen dioxide by using a reducing agent mass flow rate used in the reduction reaction used for the nitrate reduction reaction; Calculating a mass flow rate of the nitrogen dioxide in the NOx reduction catalyst is a sleep; And the mass flow of the desorbed nitrogen dioxide, and then reproduced from the mass flow, and the mass flow rate of the slip of nitrogen dioxide of the reduction of nitrogen dioxide calculating a mass and the mass of oxides of nitrogen in the nitrogen dioxide remaining in the NOx reduction catalyst; may include .