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이형승(H.S.Yi),김재업(J.U.Kim),김한조(H.J.Kim) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To overcome such problems as lower power and abnormal combustion at the intake port injection type hydrogen supply system. we designed and constructed solenoid driven in-cylinder injection type hydrogen injector. Injection quantity and leakage amount were measured through the rig test. To predict the effects of design factors. the performance of injector was numerically analyzed.<br/>
이형승(H.S.Yi),김종우(J.W.Kim),박종범(J.B.Park),이용규(Y.G.Lee),김응서(E.S.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
Intalke port injecion type and in-cylinder injection type hydrogen fuel suply systems were designed, assembled and adapted to the single cylinder research engine to understand the performance and emission characteristics of hydrogen fueled engine according to the mixture formation.<br/> At the lou load condition, extemal mixing method wiht the intake port injection was superior in thermal efficiency and engine operation stability. At the high load condition, internal mixing method with the in-cylinder injection was superior to the external mixing. At the engine test with the condition of throttle valve control, the engine was operated more stable and more efficiently when the fuel-air equivalence ratio was maintained above some level in spite of pumping loss, due to the stable combustion. This trend was showed in both cases, intake port injection and in-cylinder injection.<br/> The hydrogen fueled engine can be operated more efficiently with the in-cylinder injection at higher load and with the intake port injection at lower load. Throttle control at low load condition makes the hydrogen engine more efficient.<br/>
흡기관 분사 방식 수소 연료 기관의 성능 및 배출물에 관한 연구
이형승(H. S. Yi),이석재(S. J. Lee),이종화(J. H. Lee),유재석(J. S. Yoo),김응석(E. S. Kim) 한국자동차공학회 1993 한국 자동차공학회논문집 Vol.1 No.2
Using the solenoid driven gas injection valve. Hydrogen fuel supply system was made. It was attached to a single cylinder research engine and intake port injection type hydrogen fueled 5.1. engine was construc-ted. Engine performance, emission characteristics, and abnormal combustion were studied through the engine test performed with the variations of fuel-air equivalence ratio and spark timing.<br/> Compared with gasoline, hydrogen burns so fast that cylinder peak pressure and temperature are higher and NO is emitted more at full load condition. In the case of intake port injection type engine, COV_imep becomes lower due to the well-mixing of air and fuel, and engine output is lower owing to the low volumetric efficiency. As fuel-air equivalence ratio goes up, the combustion speed increases, and COV_imep decreases. NO emission peaks slightly lean of stoichiometric. As spark timing advances and fuel-air equivalence ratio goes up, the cylinder peak pressure and temperature become higher. so abnormal combustions take place easily.<br/>
이형승(H. S. Yi),김한조(H. J. Kim),김응서(E. S. Kim) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.6
The solenoid actuated hydrogen injector and the capacitive peak-hold type driving circuit were designed and made, and the hydrogen supply system for in-cylinder injection was constructed with these. The performance of the injector was investigated through measuring the pintle lift profiles and the injection quantities, and the performance of the hydrogen supply system was confirmed through the experiments at the single cylinder engine.<br/> The injection quantity increased linearly as the duration of driving signal increased. At the single cylinder engine, the hydrogen injector was operated stably. The hydrogen flow rate of the injector with the peak-hold type driving circuit could be controlled precisely at high engine speed or low load condition only with the variation of signal duration.
이형승(H. S. Yi),이용규(Y. G. Lee),김한조(H. J. Kim),김응서(E. S. Kim) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.1
The performance of the solenoid actuated hydrogen injector and the capacitive peak-hold type driving circuit was predicted through the modeling of the injector and the driving circuit, the mod-eling was composed of the driving circuit, the solenoid, the moving parts of the injector, and the hydrogen injection system. The performance of the injector through the modeling was compared with the results of the solenoid and injector rig tests, and those were consistent with each other.<br/> Through the prediction of the injector performance, the effects of the components such as electrical resistor, capacitor, and injector spring are easily known to the injector designer and it becomes convenient to choose the appropriate components which satisfy the injector performance required.
기체 연료를 사용한 전기점화기관에서 운전조건이 HC 배출물 성분에 미치는 영향
박종범(J. B. Park),최희명(H. M. Choi),이형승(H. S. Yi),김응서(E. S. Kim) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.1
Using gas chromatography, the light hydrocarbon emissions were analyzed from 51 engine fu. eled with methane and liquified petroleum gas(LPG), and the effects of fuel and engine operating condition were discussed. For this purpose, 14 species of light hydrocarbon including 1,3-butadiene were separated, calibrated with standard gas, and measured from undiluted emissions. The brake specific hydrocarbon emission(B5HC) and ozone forming potemtial(BS03) were calculated and discussed with the changes of fuel, engine speed, load, fuel/air equivalence ratio, coolant tempera. ture, and spark timing.<br/> As a result, exhaust emission was composed of mainly fuel component and other olefin com ponents of similar carbon number. The olefin components such as ethylene and propylene determost of the ozone forming potential. The fraction of fuel component in total hydrocarbon emission was bigger with methane fuel than with LPG fuel. Also fuel fraction increased at high speed or high speed or high temperature of exhaust gas, and to lesser extent with high coolant temperature and retarded spark. However, the effect of equivalence ratio had different tendency according to fuels.<br/>