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DPF에 누적된 PM 저감을 위한 연료 분사식 연소후처리장치 설계에 관한 연구
변영호(Youngho Byun),박경석(Kyoungsuk Park),손성만(Sungman Son) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
PM will be occurred by diesel combustion. Therefore, DPF devices are used to reduce PM in diesel vehicles. In DPF devices PM could be accumulated and combustion gas could not be exhaust. Accumulated PM should be removed. Now, burning the accumulated PM is the most commonly used. In this work, we have studied on design variables to develop combustion after-treatment device where a misfire does not occur at less fuel combustion.
배기관 형상변화가 배압특성 변화 및 엔진성능에 미치는 영향
손성만(Sungman Son),박경석(Kyoungsuk Park),박세종(Sejong Park),변영호(Youngho Byun),최석렬(Seokryeol Choi) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
In recent years, the influence automobile emission control on environment has becom an increasingly serious problem and exist noise problem, Particulary, in this problem influence development sub muffler, dual muffler, etc. These exhaust component constantly increased. In this reason, Back pressure from the automobile is generated by various shape such as the internal combustion engine, the inlet and exhasut components and the flow the exhaust pipe of the exhaust system. The technicians paid attention to the exhaust system, through which the back pressure with driving speed which is considered to be exhaust system form. the exhaust system attached to the engine affects the combustion performance and torque, power output and back pressure, and they are in opposite relation to each other. In this study, research on back pressure characteristics relate of exhaust system.
최석렬(Seokkryeol Choi),박경석(Kyoungsuk Park),박세종(Sejong Park),변영호(Youngho Byun),손성만(Sungman Son) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is necessary to consider the stability, economic environmental-friendly problems by the development of the road, supply of the automobile, environmental problem as designing the exhaust system. To reduce the noise and the vibration of the automobile, it is needed to consider the pulsation noise, air current noise, vibration of air pipe which generate the intake and exhaust noise of the automobile. Moreover, the discharge sounds, intake sound, radiation sound, transmitted sound are occurred. To reduce this influence, the variable valve is needed and to control these factors, path transformation muffler and active type muffler are needed, while engine efficiency could be reduced with this transformation and resistance by the pressure, thermal property.<br/> In this study, in order to establish the optimized conditions design factors which are taking many performance as the variable valve, it shows how the standard performance and the additional element of the exhaust system effects on the engine performance.
최석렬(Seokryeol Choi),박경석(Kyoungsuk Park),박세종(Sejong Park),변영호(Youngho Byun),손성만(Sungman Son) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
It is often occurred that exhaust pipe of an internal combustion engine should be bent due to some geometrical constraints. Especially for automobiles most of exhaust pipes of engines have curvature to avoid rear axles. In this study effects of pipe curvature on the performance of a SI engine have been studied. Experiments were carried out on a 4 cycles, 2000㏄ automotive SI engine. Three types of curvature, straight pipe, circular arc and rectangle, were tested. By inserting bent pipes of different curvature dimensions into the engine exhaust pipe at various engine operating conditions numerous states of engine performance and fuel consumption were measured.<br/> In this study some important engine performance such as rate of heat release, specific fuel consumption and etc., were derived and compared with those of different bent pipes.
손성만(Sungman Son),박경석(Kyoungsuk Park),박세종(Sejong Park),서호철(Hochul Suh),변영호(Youngho Byun),지운기(Woonki Ji) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently automobile exhaust system complex has many components concerning to the environmental restrictions. Also it brings the engine performance down by increasing the backpressure in the exhaust system. In this study, it is to analyze how backpressure influences on the combustion characteristics of engine with semi-active muffler, to reduce the noise and vibration. The performance of semi-active muffler is determined by the parameter of exhaust variable valve. The exhaust variable valve is affected by the air gap, diameter of wire, coil number and free angle. The free angle influences the backpressure performance fully. In this study, using semi-active muffler technology, we make . five types of exhaust variable valve with free angle. The pressure transducers are set up on inlet of the catalytic converter and the main muffler to analyze the back pressure characteristics of the exhaust system. The experiments are carried out differently type of semi-active muffler.
노형철(Hyungchul Noh),박경석(Kyoungsuk Park),최명진(Myungjin Choi),한창평(Changpyoung Han),변영호(Youngho Byun) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
While a great deal of automobile accidents are caused by the carelessness of drivers, a more careful study illustrates that another major cause for these accidents can be found in improper road conditions and poor transportation facilities. Visual distances is one of the important factors in the geometric design of roads. In particular, the visual distance for stopping is very important in the design of vertical and surface alignments. It is also vital in establishing control and operational methods for intersections which tack roads or traffic lights. Deceleration and the friction coefficients of tire and surface play an important role in calculating the visual distance. In other words, when the friction coefficient is smaller, the safety stop visual distance must be longer. In contrast, when the friction coefficient is larger, the design standard for visual distance becomes shorter. The road traffic safety authority has recently studied the stop friction coefficient and the results has highly different from the prices set by American Association of State Highway and Transportation Officials(AASHTO). In this research various various test automobiles are used separately to study speed, roads, and road surfaces. Then the results are analyzed and compared with similar tests and related tests conducted in the past.
노형철(Hyungchul Noh),박경석(Kyoungsuk Park),박세종(Sejong Park),변영호(Youngho Byun),한창평(Changpyung Han),손성만(Sungman Son) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
In design of muffler, Noise reduction is most important point in the past. By reason of this factor, study of muffler mainly used acoustic analysis for predictive modeling. but, recently muffler design factor, back pressure reduction and enhanced engine performance is more important than noise reduction. and developing process uses FEM and fluid analysis. but these process is not clearly defined the value for effective pressure.<br/> In this study, make experiment in muffler and semi-active muffler and analysis back pressure. This has made it possible to optimize muffler design, and defined design variable.