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조한승(H.S.Cho),송해박(H.B.Song),이종화(J.H.Lee),이귀영(K.Y.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Unburned hydrocarbon is a key contributor to both the fuel economy and emissions of automotive engine. Cyclic variation of HC emission is of importance, especially during throttle transients. The real time measurement of hydrocarbon is particularly important to obtain a better understanding of the mechanisms for combustion and emissions, especially during cold start and throttle transient condition.<br/> This paper reports the cycle resolved measurement technique of unbumed hydrocarbons to quantify rapid changes of in-cylinder concentration in the vicinity of spark plug by using the Fast Response Falme Ionization Detector(FRFID). While this instrument actually measures fuel concentration, its results can be indicative of the AFR behaviour. In order to understand the rapid change of hydrocarbons with cylinder pressure, it is necessary to study the response time delay of the system, including the time associated with gas transportation to FID. And signal from FRFID is correlated with cylinder pressure data to relate changes in mixture preparation to the classic analysis, such as indicated mean effective pressure(IMEP) and ignition delay, etc.<br/>
가솔린 엔진의 밸브타이밍 변화가 부분부하 조건에서 잔류가스량 및 연소특성에 미치는 영향
김철수(C.S.Kim),송해박(H.B.Song),이종화(J.H.Lee),유재석(J.S.Yoo),조한승(H.S.CHo),안동원(D.Y.Ahn) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
In-cylinder flow and mixture formation are key contributor to both idle stability and co mbustion stability at part load of automotive engine. The real time measurements of air-f uel ratio and residual gas fraction in cylinder are particularly important to obtain a better understanding of the mechanisms for combustion and emissions, especially during cold sta rt and throttle transient condition.<br/> This paper reports the cycle resolved measurements of residual gas fraction and equivalence ratio near spark plug with cam phasing and its effects on combustion characteristics at part load. The results showed that the effect of intake valve opening on the residual gas fraction was smaller than that of exhaust valve closing because of bumed gas back :low decreases from exhaust port at the same valve overlap. The standard deviation of equivalence ratio near spark plug increased with valve overlap increases and its effect affected the heat release rate, COVimep, etc.<br/>