METHOD FOR PREDICTING NOx LOADING AT DeNOx CATALYST AND EXHAUST SYSTEM USING THE SAME

The present invention is a reducing agent that is how to actually estimate the amount of NOx stored in the NOx reduction catalyst to accurately estimate the amount of NOx that is stored in and by using this, when playback of the NOx reduction catalyst and injected into the NOx reduction catalyst It relates to the amount of the exhaust device to be controlled. A method of predicting the amount of NOx stored in the NOx reduction catalyst according to an embodiment of the present invention comprises a step of calculating the mass flow rate of the nitrogen oxide stored in the NOx reduction catalyst; Calculating a mass flow of NOx which is thermally desorbed from the NOx reduction catalyst; Calculating a mass flow rate of the nitrogen oxide chemical desorption from the NOx abatement catalyst; And nitrogen by using a mass flow rate of the nitrogen oxide chemical desorption from the mass flow rate of the nitrogen oxide thermal desorption from the mass flow rate, the nitrogen oxide reduction of the NOx catalyst to be stored in the NOx reduction catalyst, and the NOx reduction catalyst oxide It may comprise; calculating the amount of NOx that is actually stored in the reduced catalyst.