| 摘要 |
PROBLEM TO BE SOLVED: To rationalize the temperature of an exhaust emission control vessel of catalyst or the like by a simple constitution. SOLUTION: In the halfway of an exhaust manifold 18, an NOx catalyst 19 reduction purifying NOx in an exhaust is arranged. In a periphery of an upstream part of the NOx catalyst 19 and its periphery of the exhaust manifold 18, respectively a heat accumulator 24, 25 is provided. In each heat accumulator 24, 25, a fusion latent heat type accumulating material 26 is sealed in a good heat conductive closed case 24a, 25a. In this fusion latent heat type accumulating material 26, use of a fusion latent heat type accumulating material with a phase change generating temperature (fusing temperature) in s purifying temperature range of the NOx catalyst 19 is only required, and more preferably a fusion latent heat type accumulating material with a fusing temperature in almost the center of a purifying temperature range of the NOx catalyst 19 may be used. For instance, in the case that the almost center of the purifying temperature range of the NOx catalyst 19 is about 250 deg.C, as a fusion latent heat type accumulating material 26, NaF-SnF2 of 253 deg.C fusing temperature may be used. |
