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SI 엔진의 공회전 상태에서의 연소 안정성 개선에 관한 연구
주신혁(S.H.Joo),전광민(K.M.Chun) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The objective of this study is to improve the idle combustion stability of the SI engine. In order to satisfy this objective, an uniquely designed mixture gas injection device is installed to the engine, and the combustion characteristics are analysed by flame visualization and pressure aquisition techniques<br/> This device makes the mixture gas enter the cylinder tangentially with high velocity. Therefore, it can reinforce the swirl flow. This device can also reduce the burned gas backflow as it makes the intake port charged with the mixture gas by 1 atm just before the intake valve opening time. The reduced pressure difference between the intake port and the combustion chamber at the early stage of the intake process make it possible to reduce the burned gas backflow.<br/> As a result of the reinforced swirl flow and the reduced backflow, the early flame rotates to the swirl direction and the COV_imep is improved about 50 % when the mixture injection device is installed.<br/>
[가솔린엔진부문] 화염전파과정 촬영을 통한 SI 엔진 공회전 상태의 화염전파 속도 및 연소과정중 스월 속도 측정에 관한 연구
주신혁(Shin-Hyuk Joo),신영기(Younggy Shin),전광민(Kwang-Min Chun) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
The objective of this study is to obtain the flame propagation speed and swirl speed from the bottom view type flame propagation image. The flame image contains the mixed information. i.e. the flame propagation due to combustion and the flame stretch due to the in-cylinder flow. To obtain each information respectively the image and velocity acquisition experiments was carried out and a new flame propagation model was developed.<br/> As a result. it is noticed that the flame propagation speed steadily increases at early times and converges to a constant value and finally decreases. It is also found out that the maximum swirl flow speed almost keeps constant during the combustion stage
스파크 점화 기관의 공회전 속도 모델링 및 최적 제어에 관한 연구
주신혁(Shin Hyuk Joo),전광민(Kwang Min Chun),양현석(Hyun Seok Yang) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
In this study, an engine idle speed control system is developed. In order to develop an engine idle speed control system, a modeling of engine dynamics is carried out. A MISO (Mullti Input Single Output) linear model which has two inputs and one output is developed. Inputs are the spark timing and the ISCV (Idle Speed Control Valve) position. Output is the angular speed of the engine. The reliability of the developed model is confirmed by comparing the response of the engine to step inputs with the simulation results. In order to reduce the steady state error, an integrator state is inserted to the state equation. And an engine idle speed controller is designed using optimal control theory. On the basis of the simulation and the experimental data, the design parameters are determined. The developed controller reduced the idle speed drop caused by an external load and recovered the desired idle speed in one second<br/>
김대열,한영출,조재명,김양술,주신혁,박병완 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-
An experimental study presents characteristics of combustion in a combustion chamber by port deactivation valve for economy and emissions standards. In order to use combustion properties data, it is necessary to build some data base, which use cylinder pressure sensor, etc. Port deactivation valve has been developed to satisfy requirement of achieving sufficient swirl generation to improve the combustion. A feasibility and necessity of combustion pressure based cylinder spark timing control has been examined. So, this was obtained the Coefficient of Variation(COV) and the mass-burned(MFB). The characteristics of pressure ratio fraction is similar to that of mass-burned fraction. Using the results of the test, the effects of the combustion chamber can be improved combustion stability by port deactivation.