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정연종(Y. J. Chung),조규상(G. S. Cho),김원배(W. B. Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
According as the gasoline engine of carburetor type is converted to the electric controlled fuel injection system with electric control, the improvement of fuel economy and the decrease of exhaust emissions are realized. In general, the stability of engine operation is improved, but the stability of engine operation at idle is not improved as a whole in the electric controlled fuel injection as compared with the gasoline engine of carburetor type. In addition, the increase of idle time according to the traffic congestion has as an effect on the engine stability and vehicle reliability. Therefore in this research, we will study the influence of stability at the idle condition according to fuel injection time, ignition time, air-fuel ratio in basically.
가솔린 기관의 공회전 안정성 및 공기 연료비 변동의 해석
정연종(Y.J.Chung),조규상(G.S.Cho),김원배(W.B.Kim),권영직(Y.J.Kwon) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The stability of engine operation is improved, but the stability of engine operation at idle is not improved as a whole in the electric controlled fuel injection as compared with the gasoline engine of carburetor type. There are some reports that the stability of engine operation is related to the variations of air-fuel ratio.<br/> It was recognized that the stability of engine at idle is affected by the factors of fuel injection timing, ignition timing and air-fuel ratio. Therefore in this research, we will study the influences of stability and the variations of air-fuel ratio of the electric controlled fuel injection gasoline engine at idle according to fuel injection timing, ignition timing and air-fuel ratio as the basic parameters, and analyze the variations of air-fuel ratio.<br/>
송영식(Y.S.Song),최호경(H.K.Choi),정연종(Y.J.Chung),김문헌(M.H.Kim),이종태(J.T.Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
To present credible fundamental data for the optimum design of combustion chamber and intake port, and for the prediction of engine performance. unsteady intake flow visualization device was made and visualizations of flow in cylinder with 2 intake valves during intake process were made by using PIV. It was found that the aspect of flow motion in cylinder with 2 intake valves were tumble patterns symmetric to valve bridge.<br/>
조규상(G.S.Cho),정연종(Y.J.Chung),김원배(W.B.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
In the sequential MPI system, for better identical mixture formation conditions for ail cylinders, injection timing can be better adjusted to engine requirement. Engine behavior is clearly different depending on the injection time during intake stroke. An injection time relatively late in the intake stroke, i.e. IT 720degree, translates into increased combustion stability, COV(Pmax), A/F excursion, combusted fuel.<br/>
조규상(G. S. Cho),정연종(Y. J. Chung),김원배(W. B. Kim) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.6
In the sequential MPI system with one injection for each cycle, engine performance is influenced by the mixture conditions. It can be said that engine performance is improved by being better iden tical mixture formation conditions for all cylinders. As the fuel injection timing to the intake port effects on the mixture formation conditions and the engine performance, injection timing must be better adjusted to engine requirements.<br/> Engine behavior was clearly different depending on the injection time during intake stroke. Therefore it was studied that injection timing of fuel effects on the engine performance i. e. combustion stability, COV(imep), A/F excursion, CO, HC emission concentration and fuel consumption. It was found that late intake-synchronous injection was deteriorated the combustion characteristics and performance characteristics, while early intake-synchronous injection resulted in favorable engine behavior.<br/>