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The authors of this article reported in the previous paper[1] that the employment of oxidation catalyst was superior to the fuel modification such as reduction of T90 or poly-aromatic hydrocarbons in the improvement in exhaust emission reduction effect, as a part of approach to reduce diesel exhaust emissions based on fuel modification. In this paper, the exhaust emission reduction effect of a mixed diesel fuel containing 10% di-ethylene glycol di-methyl ether (DGM), which is an oxygenated fuel, in diesel fuel was evaluated, and the reduction effect was also evaluated with oxidation catalyst equiped engine. As the result, the THC, CO and PM reduction effect of DGM was clarified and further great PM reduction effect of the combination of DGM and oxidation catalyst was clarified.

To cope with che possible heat soak phenomenon occuring in turbochargers, an analytical system has been developed making it possible to interpret the soak phenomenon so an effective eqantitative improvement can be quickly determined. This system includes an input generator, which has been obtained by modeling, on the basis of the existing three-dimensional thermal conduction analysis, the physical form of each part of the turbocharger according to degree of its influence on the analysis, an iterative system of analysis and, output from which results can be consecutively estimated. This analytical system has been verified by comparison to bench test results. It can be expected that this system will become an effective means to improvement and development.