Technology for Environmental Harmonization and Future of the Diesel Engine

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. Next, this paper describes the background to the improvement of output and thermal efficiency of heavy duty diesel engine, the history of reduction of the exhaust emissions from heavy duty diesel engine and the compatibility technology for the environmental harmonization. After this paper presents the combustion concept, modernized combustion system and after-treatment system of heavy duty diesel engine. Then the new combustion technology for heavy duty diesel engine is described in this paper. Finally this paper discusses the future of the heavy duty diesel engine as a motive power source for heavy duty commercial vehicles.