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가솔린엔진에서 액막연료량 추정 및 이를 이용한 공연비 예측에 관한 연구
황승환(S.H.Hwang),이종화(J.H.Lee),박경석(K.S.Park) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
According to the stringent exhaust emission regulation, precise control of air fuel ratio is one of the most important issues on gasoline engine. Although many researches have been carried out to identify the fuel transport phenomena in a port fueled gasoline engine, complexity of fuel film behavior in the intake port makes it difficult. The fuel film behavior was investigated recently by using visualization method and these gave us qualitative understanding. The purpose of this pape is to estimate of wall wetting fuel in take port and The inducted fuel mass was predected using by wall wetting fuel model. The model coefficient(α ,β) and fuel film mass on the port wall was determined from measured in-cylinder HC consentration using FRFID after injection off. The Fuel film mass and a ( ratio of directly inducted fuel mass into cylinder from injected fuel mass) was increased with incresing load at the same engine speed. But 0 ( is nearly constant value(0.8-0.9). When injected fuel mass is varied at 1500rpm. the calculated air fuel ratio using well wetting fuel model was nealy the same as measured by UEGO.<br/>
황승환(S.H.Hwang),이종화(J.H.Lee),유재석(J.S.Yoo) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
With the stringent exhaust emission regulation, precise control of air fuel ratio is one of the most important issues on gasoline engine. Although many a research have been carried out to identify the fuel transport phenomena in a port fueled gasoline engine, complexity of fuel film behavior in the intake port makes it difficult. The fuel film behavior was investigated recently by using visualization method and these gave us qualitative understanding. In this paper, the quantitative measurement method for the port fuel film is studied by using Fast Response Flame Ionization Detector(FRFID). The Fuel film mass on the port wall was measured by using the methods of fuel injection off.injection on and regression.The Fuel film mass was increased with incresing load at the same engine speed.<br/>
황승환(S.H.Hwang),이종화(J.H.Lee),임진수(J.S.Lim),박경석(K.S.Park) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
The knocking is one of major parameters to improve engine performance in a spark ignition engine. Many researches have been carried out to identify them using cylinder pressure, vibration signal and so on.<br/> In the present study, measurement and analysis were conducted to set up the criteria of knock occurrence by using acceleration signal. Cylinder pressure was measured for the reference signal of knocking.<br/> Vibration signal knock detection is dependent of engine operating condition. Therefore, it is necessary to determine knock threshold value by using reference such pressure cylinder. A new algorithm is proposed for knock threshold value determination without pre-test. This algorithm is based on statistical analysis of experimental data. The results show that knock threshold value becomes nearly constant value and is independent of engine operating conditions.<br/>
민경덕(K.D.Min),황승환(S.H.Hwang),이종화(J.H.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
Future exhaust emission regulations require substantial reduction in the exhaust hydrocarbon emissions. During practical driving conditions as for instance represented by the FTP 75 test cycle the engine is operated under more transient conditions which cause the ( ) cxcursion. Deviations from stoichiometric air/fuel ratio produce more hydrocarbon emissions. This is mainly due to the fuel film on the intake port wall and intake valve surface as a fuel sink or source. A model of wall fuel film flow was developed. The model was validated by comparing the calculated results and corresponding engine experiment results. To keep the air/fuel ratio as constant during the rapid throttle opening/closing, the injection control was obtained from the simulation results.<br/>