METHOD FOR PREDICTING SOx STORED AT DeNOx CATALYST AND EXHAUST SYSTEM USING THE SAME

摘要

PURPOSE: A method for estimating the amount of sulfur oxides stored in a denox(Denitrification) catalyst and an exhaust device using the same are provided to improve the fuel efficiency by controlling the spraying amount of reducing agents and a regeneration time according to the amount of the sulfur oxides. CONSTITUTION: A method for estimating the amount of sulfur oxides stored in a denox catalyst(40) is as follows. A mass flow of the sulfur oxides poisoning the DeNOx catalyst in a present operation state of a vehicle is calculated. The mass flow of the sulfur oxides desorbed from the DeNOx catalyst in the present operation of the vehicle is calculated. An output value by subtracting the mass flow of the sulfur oxides poisoning the DeNOx catalyst from the mass flow of the sulfur oxides desorbed from the DeNOx catalyst is integrated. The mass flow of the sulfur oxides poisoning the DeNOx catalyst is calculated.