METHOD OF DESULFURIZING LEAN NOx TRAP OF EXHAUST PURIFICATION SYSTEM PROVIDED WITH LEAN NOx TRAP AND SELECTIVE CATALYTIC REDUCTION CATALYST AND EXHAUST PURIFICATION SYSTEM

Lin Knox trap according to an embodiment of the present invention (Lean NOx Trap; LNT) and selective reduction; desulfurization method of the LNT in an exhaust gas purification device provided with a (Selective Catalytic Reduction SCR) catalyst meets the desulfurization possible conditions of the LNT determining; And determining that it meets the requirements of the desulfurization LNT; And LNT desulfurization if any of the possible conditions and LNT desulfurization requirement, comprising: proceeding to the desulfurization of the LNT; includes the step of proceeding to the desulfurization of the LNT is in accordance with the happy with the H2S generated in the mode switching condition in accordance with the desulfurization temperature in accordance with the happy with the mode change condition it may be carried out while repeating the desulfurization lean mode and the rich mode desulfurization.