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곽지현(J.H.Kwark),김현규(H.G.Kim),전충환(C.H.Jeon),장영준(Y.J.Chang) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
To provide the appropriate direction for development of transient control algorism in SI engine, performance analysis and evaluation under rapid accelerating and decelerating driving conditions are carried out by experimental study. In order to evaluate the characteristics of transient performance quantitatively, the concept of transient response method has to be needed. Several parameters such as engine speed, mass air flow, MAP, fuel inject duration are measured simultaneously during the rapid opening and closing of the throttle valve by the step motor controlled by PC. During the rapid opening, MAP or mass air flow is increased without delay, but engine revolution is delayed as long as the valve opening rate is changed. Dead time and response delay time of engine revolution are to be changed by valve opening rate.<br/>
[디젤엔진부문] 직분식 단기통 디젤엔진 실린더내 스월비 변화에 따른 유동장 계측 및 해석
이준열(J.Y. Lee),최붕기(B.K. Choi),이진욱(J.W. Lee),강건용(K.Y. Kang),장영준(Y.J. Chang) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study involves several measurement techniques to analyze swirl flow in 'a four-valve HSDI 2.0L diesel engine; swirl meter measurements and LDV measurements. Flow characteristics of a four-valve cylinder head were examined in a steady test rig for different SCV angles to quantity swirl ratio. Then the measurement of swirl mean velocity and turbulence intensity have been made for motoring condition(500,800rpm) using a laser Doppler velocimetry system which was applied in backward scattering method from top-view and bottom-view. This study also analysed some parameters of swirl ratio, swirl averaging velocity. Obtained results about the optimal intake port configuration are expected to be a suitable guide line in the analysis of the swirl flow characteristics.
단기통 가솔린 엔진을 이용한 연소가시화(연속화상을 이용한 연소해석)
김주영(J.Y.Kim),최수진(S.J.Choi),전충환(C.H.Joen),장영준(Y.J.Chang),주영철(Y.C.Joo) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
A combustion flame visualization system, for use as an engine diagnostics tool, was developed in order to understand the combustion reaction mechanism in the development stage of mass-produced S.I. engine. The measurement system consists of a still camera, a high speed camera and a computer-aided image processing system. The high speed camera system is capable of high speed photography up to 5000 fps.<br/> By using this system, flame structure estimated from the greylevel on acquired image and direction of flame propagation(shape of flame) in a single cylinder gasoline engine has been measured through the still camera and the high speed camera to understand combustion phemonena.<br/> There is a correlation between the air flow motion(swirl) and flame during combustion cycle. resulting in faster flame development to face exhaust valve.<br/>
김주영(J.Y.Kim),최수진(S.J.Choi),전충환(C.H.Joen),장영준(Y.J.Chang),주영철(Y.C.Joo) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
A combustion flame visualization system, for use as an engine diagnostics tool, was developed in order to evaluate combustion chamber shapes in the development stage of mass-produced S.I. engine. The system consist of an image converter camera and a computer-aided image processing system.<br/> By using this system, flame structure estimated from the brightness level on a image and direction of flame propagation in a single cylinder gasoline engine were measured. The flame propagation in a single cylinder gasoline engine has been measured through a I-CCD camera to understand combustion phenomena.<br/> The results showed that the. flame in the initial stage seemed to be blue flame, luminous flame in the end stage. Most of images, the flame propagation was occurred rapidly in the direction of exhaust port, while it was observed smooth flame propagation in the direction of intake port.<br/>
노정걸(J.G.Roh),차강욱(K.W.Cha),전충환(C.H.Jeon),장영준(Y.J.Chang),오상헌(S.H.Oh) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In this experimental study, the effects of injection timing on the performance in a four stroke cycle spark-ignition engine have been investigated. In order to asses the engine response characteristics, performance parameters such as air-fuel ratio, output torque and emissions were measured under the part-load condition. The influence of fuel injection timing on the operation stability was observed. Results show, as the fuel is injected during intake stroke, deteriorated volumetric efficiency and hence lower engine performance.<br/>