| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of rising a temperature of an aftertreatment device of a selective reduction type catalyst and the like at an earlier stage than conventional.SOLUTION: An exhaust pipe 2 upstream of an oxidation catalyst 9 is provided with: a fuel addition device 10 (fuel addition means) for directly injecting fuel 8 in the exhaust pipe 2; and a modified gas addition device 12 (modified gas addition means) for dissolving the fuel 8 into modified gas 11 with high response and introducing it in the exhaust pipe 2. The modified gas 11 is introduced by the modified gas addition device 12 when a temperature of the oxidation catalyst 9 is not less than a first temperature that is an active lower limit temperature at which the modified gas 11 from the modified gas addition device 12 can be oxidized, and lower than a second temperature that is an active lower limit temperature at which the added fuel 8 from the fuel addition device 10 can be oxidized. The fuel 8 can be directly injected by the fuel addition device 10 when the temperature of the oxidation catalyst 9 is not less than the second temperature. |
