An exhaust gas purification device and method for calculating the NH3 mass generated in a lean NOx trap of the exhaust gas purification device

摘要

A method for calculating the ammonia (NH3) mass produced in a lean NOx trap (LNT) of an exhaust gas purifier includes sequentially calculating the NH3 mass flow downstream of each disc from a first disc to an nth disc and integrating the NH3 mass flow downstream of the nth slice over a predetermined time, wherein the calculation of the NH3 mass flow downstream of the i-th slice calculates the NH3 mass flow flowing into the i-th slice, calculating the in the i-th slice generated NH3 mass flow and adding the generated in the i-th disc NH3 mass flow to a value obtained by subtracting the NH3 mass flow used to reduce the NOx and the O2 in the ith slice of the in the i-th slice is obtained flowing NH3 mass flow having.