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이종민(Jongmin Lee),이종구(Jonggoo Lee),이광주(Kwangju Lee),이종태(Jongtai Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Backfire for the spark ignition hydrogen engine was possible to control by retard of the intake valve opening timing(IVO). However, for the HCCI(Homogeneous Charge Compression Ignition) H2 engine, backfire occurred due to the excessive pressure rising by high compression ratio even when same method was used. In this study, in-cylinder pressure and intake pressure were analyzed with the intake valve opening timing and the compression ratio, for grasp of transient process and characteristics of backfire occurred in the HCCI H₂ engine. As the results, it was shown that backfire was occurred always after knock and was not significantly affected by retard of the intake valve opening timing under given experimental conditions. In addition, the higher compression ratio or the more retarding of intake valve opening timing, the more advanced backfire occurrence timing.
이광주(Kwangju Lee),이종구(Jonggoo Lee),이종민(Jongmin Lee),이종태(Jongtai Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
The power of a hydrogen-fueled engine higher than gasoline had been disturbed by backfire. Therefore, in order to get the power of higher than gasoline engine level in a hydrogen-fueled SI engine, the change in the valve timing and the effect of the lean boosting are analyzed. As the results, the exhaust valve closing timing is not worked on backfire control, but the intake valve opening timing is worked. In addition, it is confirmed that the power of higher than gasoline engine level and NOx-free are achieved by lean boosting. This value are obtained under 2.1bar and Φ=0.3.
농공용기관의 CNG화를 하기 위한 연소실형상의 적정화 연구
이종구(Jonggoo Lee),이광주(Kwangju Lee),김용락(Yongrak Kim),이종태(Jongtai Lee),허상훈(Sanghun Hur),장양(Yang Jang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In order to suggest suitable combustion chamber of the CNG engine for an agricultural and industrial use, 5 type of combustion chamber was found performance for combustion chamber to respond high-load and fuel efficiency. The combustion chamber of 5 type was found COV-imep less than 5%. In the case of thermal efficiency Open dish type was better than flat type. NOx was low emission at flat type by minimum flow in cylinder and HC was least emission at open dish Ⅰtype. The CNG engine for an agricultural and industrial was suggested the open dish Ⅱ type among the 5 type of combustion chamber in terms of high-load and suggested the open dish Ⅳ type in terms of fuel efficiency.
이광주(Kwangju Lee),허상훈(Sanghun Hur),김용락(Yongrak Kim),이종태(Jongtai Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In order to grasp the possibility of simultaneously achieving ultra low NOx, high power and high efficiency without backfire in a hydrogen-fueled engine using external mixture injection at high load, as early step the effects of low temperature combustion were analyzed in terms of backfire occurrence, knock and performance enhancement. As the results, it was found that the achievement of backfire control by retarding IVO, high power(above a gasoline engine) and high efficiency(around 37.5%) in a hydrogen-fueled engine is possible around a boosting pressure of 1.7 bar at an equivalence ratio of Φ=0.4.