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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.
가솔린기관 흡기관에서의 전자과잉 상태가 기관성능에 미치는 영향
서문진(Mun-Jin Seo),손상근(Sang-Geun Son),박광희(Kwang-Hee Park),윤건식(Keon-Sik Yoon) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, the influence of the presence of ions in the intake system on the performances of a MPI gasoline engine was investigated. The tourmaline powder has been coated inside the intake pipe located at the inlet of the throttle body to generate negative ions. Experiment has been carried out for various throttle settings and engine speed to examine the effect of the abundant ions in the intake system. Although a little discrepancy due to the difference in operating conditions was observed at low throttle setting, the remarkable differences in the engine performances have not been observed by applying the negative ions in the intake system.
다실린더기관 흡기관내의 압력변동과 체적효율에 관한 연구
서정일,조진호,김형섭,김병주 대한기계학회 1990 대한기계학회논문집 Vol.14 No.1
The characteristic of volumetric efficiency considering gas exchange process in a reciprocating engine is presented in this paper. The characteristic method is used for solving gas exchange problems of engine system in theoretical studies. The validity of the simulation is investigated by a comparison with the results obtained by the experiment which have been performed on the practical 4-cycle, 4-cylinder gasoline engine. The relationship between the volumetric efficiency and the intake pressure variation according to configuration of intake pipe, position of branch point, valve timing, compression ratio is clarified through simulation and experiment. The results predicted by the simulation are found to be in approximate agreement with those obtained by the experiment. 본 연구에서는 4사이클, 4실린더기관을 대상으로 하고 흡배기계의 유동특성에 관계되는 인자들을 고려하여 가스교환 과정 시뮬레이션과 실험을 수행하였다. 관내 의 유동현상의 해석에는 압력, 속도의 변화에 대하여 추종성이 좋은 특성곡선법을 이 용하였으며 실험에 있어서 흡기관내의 압력은 직접 제작한 데이터처리장치를, 실린더 내의 압력은 연소압력계측장치를 이용하여 측정하였다. 연구의 목적은 시뮬레이션에 의하여 흡기관내의 압력변동 및 체적효율을 계산한 결과와 실험결과를 비교검토함으로 서 특성곡선법에 의한 본 해석결과의 타당성과 실제기관에의 적용성을 확인하고 흡배 기계의 형상과 치수, 흡배기밸브의 개폐시기, 압축비 등과 체적효율 및 관내의 압력변 동과의 관계를 구명하여 흡기관의 동적효과를 이용할 수 있는 흡기계의 최적설계 및 개선을 위한 자료를 얻고자 한다.
흡기밸브 열림 시기에 의한 흡기관분사식 수소기관의 역화억제
이광주(Kwangju Lee),Huynh Thanh Cong,강준경(Joonkyoung Kang),이종태(Jongtai Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to certify the control of back-fire in the hydrogen-fueled engine with external mixture by intake valve timing, the characteristics of combustion are experimentally studied with change of intake valve opening timing at the fixed exhaust valve closing timing. As the results, when the intake valve opening timing is retarded, back-fire limit equivalence ratio is increased, and as expected, back-fire does not occurred from TDC. In addition, the timing of the best performance without back-fire is shown when the exhaust valve closing timing is 10° ATDC and the intake valve opening timing is TDC.
포트분사식 이륜차용 엔진의 가변밸브타이밍 및 리프트에 따른 성능특성에 관한 연구
김기봉(Kibong Kim),이기형(Kihyung Lee),백승국(Seungkook Baik),정동수(Dongsoo Jeong) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, the international regulations about the exhaust emission of the motorcycle have been strengthened. Therefore, motorcycle engineers has interests in a technology that applied to automotive. The typical examples are electronic injection control system and VVT system. Among them, electronic injection control system has been studied a lot, but VVT system has not as much as others. The reasons are not only cost problem but also spacially limited space to install these systems. However VVT system has good enough value to be studied for improving engine power and decreasing emissions. That is why, in this study VVT system was applied to a electronically controlled prototype motorcycle engine using numerical analysis program "Ricardo WAVE" and also engine performance test was done experimentally to verify the numerically analyzed result. In addition steady state flow experiment was conducted to achieve intake air flux that is closely related to engine performance and efficiency.
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.
남대우(Daewoo Nam),Tran dang quoc,이종태(Jongtai Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
EGR is applied to improve combustion stability in the heavy-duty direct injection CNG engine and port injection is used to compare EGR effect at the same condition, when EGR, two different ways are used. First, the throttle is fixed regardless of various EGR rate. So, when EGR rate increase, air mass flow is decreased by high temperature of exhaust gas. As a result, the engine performance is lowered because supply heat is reduced. Also, brake thermal efficiency is decreased for bsfc increased by high temperature of exhaust gas. Second, by using throttle, constantly air mass enters into the cylinder with various EGR rate. So, supply heat can be keep constantly and the mass of mixture gas with exhaust gas is increased. Therefore, pressure is more higher than that of non EGR in compression stroke and the engine performance is improved.