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고창조(C.J.Koh),권오석(O.S.Kwon),김종필(J.P.Kim),김봉석(B.S.Kim),이영재(Y.J.Lee),권철흥(C.H.Kwon) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
In this study, the differences between the characteristics of CVS-75 mode and the driving charateristics in Seoul urban areas are investigated through the collecting and analyzing the driving pattern. In result An adjustment factor(0.75) of the approved fuel consumption to on-road fuel economy which dependent on domestic traffic environment is provided.<br/>
이영재(Y.J.Lee),김강출(G.C.Kim),권오석(O.S.Kwon),김종필(J.P.Kim),고창조(C.J.Koh),박선(S.Park),방효선(H.S.Bang),한정옥(J.O.Han) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
Natural gas is one of the most promising alternative fuels for automotive vehicles. However, natural gas varies in composition between the originating fields and may be further modified due to processing and additional mixing. These variations are known to affect engine performance and emissions through changes in fuel metering and combustion characteristics.<br/> In the present study, it was examine the effect of gas compositions on vehicle performance such as fuel economy, driveability and exhaust emissions. Analysis are made of using 3 types of NGVs which was made by auto maker and 6 different fuels which are selected in consideration of the variation in fuel composition on the worldwide market. These results may be utilized to develop natural gas engine in auto maker and/or to establish the fuel standard in the refuelling station.<br/>
김강출(G.C.Kim),권오석(O.S.Kwon),김종필(J.P.Kim),고창조(C.J.Koh),박선(S.Park),이영재(Y.J.Lee),방효선(H.S.Bang),한정옥(J.O.Han) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
Natural gas is one of the most promising alternative fuels for automotive vehicles, because it can reduce exhaust emissions than gasoline and diesel fuels, and can be used in conventional engines with a little modification. However, natural gas varies in composition between the originating fields and may be further modified due to processing prior to transmission. These variations are known to affect engine performance and emissions through changes in fuel metering characteristics and knock resistance of the fuel.<br/> The objective of this study is to examine the effect of natural gas composition on vehicle performance such as fuel economy, driveability and exhaust emissions. Analysis are made of using 6 types of natural gas fuels, which are selected in consideration of the variation in fuel composition on the worldwide market. These results may be utilized to develop natural gas engine and/or to establish the fuel standard in refuelling station.<br/>
[디젤엔진] 주행거리 누적에 따른 엔진오일의 열화에 관한 연구
이영재(Y.J. Lee),김강출(G.C. Kim),권오석(O.S. Kwon),고창조(C.J. Koh),심규성(K.S. Shim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Generally. Vehicle owner's manuals recommend engine oil changes every 10,000km under moderate driving condition. although 5,000km is recommended under severe driving condition. However. most vehicle owners replace their engine oils within 5,000km driving. then this results in the waste of resource. In the present study. monitoring test of engine oil condition was performed to examine the degradation of oil property with 21 gasoline vehicles and 6 diesel vehicles. Major domestic engine oils were used in this test. and they were analyzed every 1,000km or 2,000km driving. Moreover. fuel economy tests were performed to clarify the effect of engine oil degradation on vehicle fule consumption.
[전기·전자] 열전변환 적용을 위한 가솔린차량의 전력 및 배열에너지 분석 연구
이영재(Y.J.Lee),표영덕(Y.D.Po),고창조(C.J.Koh),김강출(G.C.Kim),권오석(O.S.Kwon) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
About 70% of energy input to internal combustion engine is rejected to atmosphere by heat. By utilizing this waste heat, a plenty of energy can be conserved in nationwide. One of possible ways is the thermoelectric generation to utilize engine's waste heat to provide auxiliary electric power. Under this concept. KIER has been developing the thermoelectric generation system to replace the alternator by converting the waste heat in the engine's exhaust directly to electricity, This system may reduce the shaft horse power of the engine. then improves the vehicle fuel economy and the exhaust emissions, This paper describes the preliminary study in which characteristics of the electric energy and exhaust heat energy in city and highway mode driving conditions are analysed. These results would be used to determine the optimum design parameters of the thermoelectric generation system.
[論文] 압축비 변경에 따른 CNG기관의 성능특성 연구
김봉석(B.S.Kim),이영재(Y.J.Lee),고창조(C.J.Koh) 한국자동차공학회 1991 오토저널 Vol.13 No.3
Natural gas is one of the most promising alternative fuels for automative vehicles, because it has lower exhaust emissions and better fuel economy characteristics than gasoline and can be used in conventional engines with a little modification. In the present study, a conventional gasoline engine was modified to a CNG dedicated engine, which can be operated with CNG<br/> (compressed natural gas) only, and a engine bench test was performed at various compression ratios. As a result, it was revealed that the prototype CNG engine can be operated with lower exhaust emissions, better fuel economy and better thermal efficiency, but with a slightly reduced brake horse power, compared to the conventional gasoline engine.
김봉석(B.S.Kim),권오석(O.S.Kwon),김종필(J.P.Kim),이영재(Y.J.Lee),고창조(C.J.Koh),권철홍(C.H.Kwon) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
This study investigates the combustion characteristics of methane-hydrogen-air premixture, in a constant volume combustion chamber. Primary factors of the combustion characteristics of methane-hydrogen-air premixture are the equivalence ratio and hydrogen supplement rate. In the case of φ = 1.1, maximum combustion pressure and heat release rate have peaks, and they increase as the initial pressure and hydrogen supplement rate increase. The total burning time is also the shortest at the φ = 1.1, it shorten by lowering the initial pressure and by increasing the hydrogen supplement rate. The maximum flame temperature is shown at the φ = 1.0, and increasing the initial pressure and hydrogen supplement rate, it increases. The concentration of NO reveals the highest value at the φ = 0.9, and it increases by increasing the initial pressure and hydrogen supplement rate. It is also found that the limit of lean inflammability of methane-hydrogen-air premixture is greatly widened by increasing the hydrogen supplement rate.<br/>