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[디젤엔진부문] 이종연료 층상분사를 이용한 디젤엔진의 NOx와 soot 동시 저감에 관한 연구
강병무(B.M. Kang),김종률(J.Y. Kim),이태원(T.W. Lee),정성식(S.S Chung),하종률(J.Y. Ha) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
<br/> ~~.A\-%7}t'--c:j-~ 2000\15:. ~;>jI~t:1J~<br/> 2000-03-2041<br/> 01<br/> 3S. 91 ~ ~A~~<br/> A<br/> L.s:.<br/> OI<br/> Ho~<br/> c:"~.n. C::>C>c r2. C:::>L ;<br/> C/~2!!~~ NOx$ soot ~AI AI~OU ~~ eF?<br/> 7J'!!-';'-, 7,J'6-it(%ottJI-o:}jj! tJI~~), 01I11~(~~ ~~tJI-O:}), '\J'\J-6j, "6J-'6-iH%ottJI-o:}jj!)<br/> A Study on the Simultaneous Reduction of :>iOx and Soot<br/> with Dual Fuel Stratified Injection System in a Diesel Engine<br/> B. 1\1. Kang, ]. Y. Kim(Graduated School of Dong- A L'niv'>, T. W. Lee(Changwon CQUage), S. S. Chung, ]. Y. Ha(Dong-A Univ,)<br/> ABSTRACT<br/> To investigate the method of the simultaneous reduction of Soot and NOx, we developed a new conception for dual fuel stratified injection system in a Diesel Engine.<br/> Some parts of the injection system, ie. nozzle holder, delivery vale. were remodeled to inject diesel and methanol in order from one injector. The Quantity of diesel and methanol was controled precisely by micrometers that were mounted at control lack of injection pump.<br/> The real injection Quantity ratio of dual fuel was certificated by volumetric ratio at injection Quantity experiment. We could confirm the capability that soot and NOx simultaneously were reduced by diesel-methanol stratified injection from the results of combustion and exhaust characteristic.<br/>
[가솔린엔진부문] PC-ECU를 이용한 SI 기관의 비정상상태 정밀공연비 제어
정용윤(Y.Y.Chung),이종승(J.S.Lee),이종순(J.S.Lee),하종률(J.Y.Ha) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
In a SI engine, three- way catalyst converter has the best efficiency when A/F ratio is near the stoichiometry. The feedback control using oxygen sensors in the commercial engine has limits caused by the system delays. So it is necessary to control fuel Quantity in accordance with intake air amount in order to reduce exhaust emission and improve the specific fuel consumption. Precise A/F ratio control requires measurement of air amount with respect to the cylinder and injection fuel accounting to the air amount In this paper, we applied nonlinear fuel injection model, and developed the algorithm of A/F ratio control. This algorithm includes the methods of measurement of transient air mass flowing into each cylinder, of calculation of injection pulse width for measured air mass, and the method of feedback and estimation control by using lambda sensor. Also we developed control program for IBM-PC by using C++ Builder, and tested it in the commercial engine. The results we have got from the work better than those of the commercial ECU.
김영석(Y.S.Kim),이중순(J.S.Lee),윤수한(S.H.Yoon),하종률(J.Y.Ha) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In the gasoline engines of fuel injection type, atomization of fuel droplet and its distribution has influence directly on the decision of engine performance and harmful emission. In this paper, atomization characteristics of fuel spray is investigated with microscopic visualization system. Particle motion analysis system is used to measure the SMD of fuel spray of air-assist injector by initial factors such as temperature of ambient air and air-assist pressure. As air-assist pressure and temperature increase, the SMD is decreased, and its variation is more stable.<br/>
김진영(J.Y.KIm),이중순(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha),배충식(C.S.Bae) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Lean burn combustion became an important concept for improving fuel economy and reducing exhaust emissions. However, lean burning is associated with increased cycle-to-cycle combustion variations due to the ignition instabilities and reduced propagation rates. Engine stability under lean mixture conditions could be improved by increasing burning rates through enhanced flow characteristics and by securing ignitability with better ignition systems.<br/> The effects of flow and ignition characteristics on the combustion performances are investigated in a 4-yalve SI engine. Flow characteristics of tumble-swirl were varied with swirl control valve attached at the inlet ports, while ignition energy and its distribution were controlled in a high-frequency ignition system by changing spark duration and spark frequency. The improvement of lean burn performance by the optimum flow and ignition characteristics was discussed.<br/>
김진영(J.Y.Kim),이중순(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
Initial flame development and propagation were visualized under newly developed ignition system to estimate the effects of ignition characteristics on the engine performance in a port injection SI engine. Effects of intake flow was also investigated by three different swirl control valves.<br/> Experiments were performed in an optical single cylinder engine modified from production engine. Flame images were captured through the quartz window mounted in the piston by high speed video camera and its image were analyzed to compare the intial flame area<br/> Results show that IMEP tends to rise slightly as the ignition duration gets longer. The direction of flame propagation is decisively governed by the in-cylinder flow motion. Every flame grows toward the exhaust valve, forming a kind of turbulent flame. The observed flame through the result of visualization is very similar to the result of analyzed from pressure data.<br/>
혼합기 유동 특성과 점화에너지 해석을 통한 신점화시스템 설계
김진영(J.Y.Kim),이종숭(J.S.Lee),이중순(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
The combustion process of spark-ignition engine takes places in a turbulent flow field has been influenced by the flow characteristics of mixture and discharge energy. Experiments were carried out with parameters such as the shape of swirl control valves. discharge pattern and distribution of ignition energy.<br/> This study aims to development of ignition system by analysis of flow characteristics of mixture flow in an engine and ignition energy for enhancement of the ignitability of lean mixture.<br/>
혼합기의 유동 및 점화에너지 방전특성이 초기화염의 전파에 미치는 영향
김진영(J.Y.Kim),이중순(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
Ignition instabilities and reduced flame propagation rates result in the increased cycle-to-cycle combustion variations associated in lean burn.<br/> Combustion stability under lean mixture conditions could be improved by increasing burning rates through enhanced flow characteristics and by securing ignitability with newly developed ignition systems.<br/> Inclined tumble(swirl) flows were induced by three different swirl control valves. The initial flame propagation was visualized by an ICCD camera and its image were analyzed to compare the enflamed area and displacement of intial flames<br/> It was found that there is a correlation between the stronger tumble during induction and comparison and turbulence levels at the time of ignition resulting in faster flame development. Inclined tumble was proved to be more beneficial than the pure tumble for shorter combustion duration and stable combustion under lean mixture conditions, which was confirmed by faster propagation flame image.<br/>