2303 高圧噴射式6ストロークディーゼルエンジンの燃焼特性に及ぼす噴射条件の影響(S25 エンジンの排気浄化・後処理,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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Six-stroke diesel engine proposed here has six processes in one cycle, i.e. intake, 1st compression, 1st combustion, 2nd compression, 2nd combustion and exhaust. By the direct EGR in the 2nd combustion process, NO emission could be expected to decrease. However, much soot was exhausted by a weak mixing in the 2nd combustion process. A high pressure injection with a common rail was introduced into the engine to improve the mixing in the second combustion process. As the result, more NO was exhausted while soot was decreased due to well mixing. In this study to decrease NO and soot simultaneously, two stage injection was applied to the engine. In the case of conventional combustion with pilot injection, NO and soot were decreased. When the main injection timing in 1st combustion was delayed extremely to control the 1st combustion process, NO and soot were more decreased compared with the case of conventional combustion with pilot injection.
社団法人日本機械学会の論文
2008-08-02