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가변 흡기시스템에 의한 디젤기관의 체적효율 향상에 관한 연구
강희영(Heuiyeong Kang),고대권(Daekwon Koh),안수길(Sookil Ahn) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
A three-degree of freedom model of intake system was contrived and investigated in various ways for the purpose of improvement of the volumetric efficiency in a low and transient engine speed for a multi-cylinder diesel engine. The basic concept beyond this model started from the theory that each degree of freedom model has volumetric efficiency peak as many as its number of the degree of freedom. The volumetric efficiency affects significantly to the engine performance; torque characteristics, fuel economy and emission level. For commercial vehicles and stationary engines, since the engine is designed so as to produce their best performance near the normal engine speeds, thus the low engine speed area has a tendency of poor volumetric efficiency. The aim of this study was highlighted on the amelioration of volumetric efficiency of low engine speed area in a multi-cylinder diesel engine matched with an additional Helmholtz resonator. Several results were depicted which deal with the behavior of the pulsating wave in the resonator and the depression wave diagram of intake process, which is very useful to estimate and predict volumetric efficiency and the intake system configuration at the stage of pre-designing.
가변 흡기시스템이 과급 디젤엔진의 체적효율 향상에 미치는 영향
강희영(Heuiyeong Kang),고대권(Daekwon Koh),안수길(Sookil Ahn),장재은(Jaeeun Jang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A variable induction system applied to a turbo-charged diesel engine was investigated in various ways for the purpose of improvement of the volumetric efficiency in a low and transient engine speed that can reduce emission level for a diesel engine. The basic concept of this model derived from the theory that the long period component affects to the volumetric efficiency in a low engine speed range. The volumetric efficiency is known to be directly proportioned to engine brake horse power and affects significantly to the engine performance ; torque characteristics, fuel economy and emission level. Since the engine is designed so as to produce their best performance near the normal engine speeds, the volumetric efficiency of the low engine speed range has a tendency of poor value for commercial vehicles and stationary engines. The aim of this study was focused on the improvement of volumetric efficiency of low engine speed range in a turbo-charged multi-cylinder diesel engine by using an additional Helmholtz resonator coupled with variable secondary induction pipe. Several results were depicted which deal with the history of the pulsating wave in the primary induction pipe and the depression wave diagram during intake process, which is very useful to estimate and predict the volumetric efficiency and the intake system configuration at the stage of pre-designing. Cutting and welding methods was applied to this investigation.
[기술논문] IMO 2단계 규제 대응 중속 4행정 디젤엔진의 친환경 기술
정석호(Jung Sukho),고대권(Koh Daekwon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
NOx regulation of Tier II reduced by 20% more than Tier I had been entered into force 1 January 2011 by International Maritime Organization All maker of diesel engine for ship had tried to achieve through pre-treatment chamber, fuel injection and intake and exhaust system. In this paper, technologies that satisfied the NOx regulation of Tier II through the modification to these parts were introduced.