| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control system for an internal combustion engine, an internal combustion engine and an exhaust emission control method for an internal combustion engine in which desulfurization control can be positively carried out while heat deterioration and erosion of a lean NOx trap catalyst device are being restricted, desulfurization of superior robustness can be carried out when desulfurization control of the lean NOx trap catalyst device provided in the exhaust gas system of the internal combustion engine is carried out, thereby a high NOx purification rate can be maintained.SOLUTION: This invention relates to an exhaust emission control system 20 for an internal combustion engine including a lean NOx trap catalyst device 24 at an exhaust passage 15 of an engine 10 in which a control device 40 for controlling this exhaust emission control system 20 sets a desulfurization temperature Tt becoming a target temperature when a desulfurization control of the lean NOx trap catalyst device 24 is carried out in correspondence with an accumulated amount Sa of sulfur accumulated at the lean NOx trap catalyst device 24.SELECTED DRAWING: Figure 2 |
