| abstract |
[PROBLEMS] To appropriately perform catalytic activity and NOx reduction at low temperatures. An after-treatment device 13 having a catalyst 14, 15, 16 disposed in an exhaust passage 12 of an engine 11 and activated by HC in the exhaust gas, and a temperature of exhaust gas supplied to the after-treatment device 13. When the fuel temperature is lower than the predetermined temperature, the fuel supply means 23 for supplying the fuel containing the high-boiling HC and the low-boiling HC to the exhaust passage 12 upstream from the post-treatment device 13, and the post-treatment device 13 and the fuel supply means 23 And an HC trap catalyst 17 that adsorbs high-boiling HC and passes low-boiling HC out of HC contained in the fuel supplied from the fuel supply means 23 into the exhaust passage 12. . [Selection] Figure 1 |