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Reduction of smoke emission from diesel engines is important in order to meet upcoming stringent exhaust gas regulations and also for improving fuel economy. In this paper, the reduction of smoke from DI diesel engines for heavy duty vehicles is discussed. A single cylinder engine test and three dimensional numerical analysis were carried out in order to obtain necessary and useful information for designing a combustion chamber and a fuel injection nozzle that could realize reduced smoke emission. This study is focused particularly on the behavior of the fuel spray which impinges on the piston cavity wall in the case of a reentrant type combustion bowl. As a result, it was found that the spray wall-impingement angle performs an important role in promoting fuel-air mixing. It is thus an important parameter which controls the main combustion region.

Mankind developed and enjoyed the automobile civilization, and has lauded the prosperity that it brought about. Commercial vehicle launched the heavy duty diesel engine have been contributing by main transportation system for development of society in the world. However both the local and global environment issues appear depend on the life of mankind, in the world. Especially, global warming is the most stringent issue for our life on the earth. We human beings must lay our existence on the line, and call upon expertise to create solutions for this situation. Diesel engine has great potential for the global warming compatibility by it's high thermal efficiency and diesel vehicle is expected to conserve the environment and to improve the fuel saving for keeping resources in the world. This paper introduces the surrounding of the automobile, such as exhaust emission regulation for heavy duty diesel vehicle, amount and contribution of CO2 emission and noise.