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Transient Engine Test Bed를 이용한 가솔린엔진의 F/E 및 Emission개선에 관한 연구
이상수(Sangsu Lee),이창준(Changjun Lee),이근봉(Keunbong Lee),이문식(Moonsig Lee),이정근(Jeongkeun Rhee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The fuel economy and emissions in a developing port injection gasoline engine with manual transmission were studied using a transient engine test bed. Because the fuel economy and emissions in the first few minutes during engine warmup show great importance, the first ECE cycle in NEDC mode was simulated. To match the fuel economy and emission levels with the roller bed test results, driver model on clutch and acceleration pedal actions were thoroughly adjusted to match engine speed and engine load of the vehicle. The faster catalyst light-off was investigated by varying crank-to-run air-fuel ratio and idle spark timing. and results showed that slightly lean air fuel ratio was more effective in heating lip the catalyst than retarding idle spark timing in terms of fuel economy. The additional engine EMS calibrations were performed to improve cruise operation points and idle regions using DOE method with L9 orthogonal test array. The overall results showed that both the fuel economy and emissions were improved during first ECE cycle in the NEDC mode test by the EMS calibration performed in this study.
이상수(Sangsu Lee),박용배(Yong Bae Park) 한국전자파학회 2017 한국전자파학회논문지 Vol.28 No.9
본 논문에서는 SMA 커넥터를 이용한 3축 펄스 탐지기의 동작 특성을 분석한다. 상용 시뮬레이터를 이용하여 3축 펄스탐지기를 모델링하고, 펄스가 인가됐을 때 동작 특성을 확인 및 분석하여 펄스 탐지기로써의 응용이 가능함을 확인한다 In this paper, the performance characteristic of 3 dimensional pulse detector using SMA connector is analyzed. Modeling of 3D pulse detectors is done in a commercial simulator. When a pulse is incident on the detector, we analyze the performance characteristics of the detector and verify the feasibility of the pulse detector.
본존스칼라 방법을 이용한 층류확산화염에 대한 수치해석적 연구
이상수(Sangsu Lee),신동흔(Donghn Shim),성낙원(Nakwon Sung) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
A simple combustion analysis was done in prior to developing a combustion analysis code of full chemistry. To analyze the laminar diffusion name established on the coflow burner, the governing equations were derived on 2-D axisymmetric plane. These equations were transformed into 4 simplified equations about radial velocity, axial velocity, vorticity, and conserved scalar. The discrete equations were solved on a nonuniform grid system by Newton's method. It was difficult to find appropriate initial guess for Newton iteration in calculating the reacting now with high temperature gradient. As a remedy for the problem, the result with fixed temperature field was used for the initial guess. To solve AX=B type matrix problem, a direct sparse matrix solver included in the commercial FORTRAN compiler was used. The distributions of temperature and major species were compared with the experiment by Xu[1]. The algorithm was proved to be feasible for the future study using multi-step reactions on finer grid system.
산소부화를 이용한 디젤기관에서의 수트 및 NOx 저감에 대한 수치해석적 연구
이상수(Sangsu Lee),성낙원(Nakwon Sung) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A numerical study was performed to investigate the effects of oxygen enrichments on the emissions of soot and NOx from a diesel engine. The flow, fuel injection, combustion and emissions inside a diesel engine were calculated using a modified KIVA code. Oxygen content in the intake air was varied from 17% to 25% by volume. <br/> As oxygen content was increased, the fuel was burned fast and more resulting in increased combustion temperature and improved fuel consumption. The increased temperature enhanced the dissociation into OH, N and O radicals and the pyrolysis of fuel. Soot emission was reduced by half with 25% oxygen because of the increased soot oxidation by OH radical, but NOx was increased by three times because of the increase of temperature and concentrations of O and N radicals. Ignition delay was reduced by oxygen enrichment, and injection timing was retarded in order to alleviate the shape increase of NOx. Although oxygen enrichment has the same problem of soot-NOx tradeoff as other technologies, it can be used appropriately with after treatment technology to reduce soot and NOx simultaneously.
Dynamic Engine Test Bench를 이용한 가솔린 차량의 Emission Test에 관한 연구
이상수(Sangsu Lee),이근봉(Keunbong Lee),이문식(Moonsig Lee),김숭기(Soongkee Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The fuel consumption and emissions from gasoline vehicle with MT and AT were tested using a dynamic engine test bench. The engine was dynamically controlled to simulate the dynamic behavior of engine inside the vehicle in motion. The variation of EMS data in vehicle such as engine speed, MAP and gear stage was closely reproduced with engine test bench by using inertia simulation and control software and found to reproduce fuel economy around ±1%, and emissions around ±10%. The forced soaking procedure, signal generator for TCU, realistic coolant temperature profile and idle MAP increased by dyno friction were tried for better correlation with vehicle data.
이상수(Sangsu Lee),조규백(Gyubaek Cho),김진현(Jinhyun Kim),김홍석(Hongsuk Kim),이의성(Euisung Lee),오권오(Kwonoh Oh),한승한(Seunghan Han),김경재(Kyungjae Kim),정용일(Yeongil Jung) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The performance of radial type metal foam DPF was studied. The radial type metal foam DPF was built by rolling INCOfoam® HighTemp into a hollow cylinder and installing it inside the DPF can with a conical flow reflector. Several types of metal foam DPF were tested. They are different in filter thickness, mean pore size, and Platinum coating with 2.5g/l or not. The test mode was determined to simulate the on-road vehicle speeds on the engine bench. In the testing vehicle speeds, the SOF in total PM emissions was so high due to the low engine load that the PM reduction via Platinum coating was dominant. Compared with cordierite filters, the radial type metal foam DPF showed similar PM reduction rate but lower increase in Δp during engine run at steady engine conditions due to their large mean pore sizes. Compared with axial type metal foam DPF studied in previous studies, the radial type metal foam DPF provides 7 times higher filtering area which enables higher PM reduction rate and lower Δp across DPF. The Platinum coated radial type metal foam filter was proven to be suitable for the replacement for cordierite filter in that it provides slow increase in Δp but comparable PM reduction rate.
현상학적 수트모델을 이용한 직접분사식 디젤엔진에서의 수트배출 예측에 관한 연구
이상수(Sangsu Lee),김홍석(Hongsuk Kim),성낙원(Nakwon Sung) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Soot emission in direct injected diesel engine was predicted using KIVA code with Foster soot model. Multi-step reactions in Foster mode1 were rearranged into a set of differential equations, and VODE solver was used to solve these stiff equations simultaneously. Estimated soot production in heavy duty diesel engine was compared with experimental data at air-fuel ratios of 19 and 25. The model overpredicted soot emission at air-fuel ratio of 25, but the solution was consistent with other soot researches. The mode1 was effective at explaining the soot formation mechanism<br/>
이상수(Lee SangSu) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.10
The train transportation has a lot of advantages- energy efficiency is high, it is eco-friendly, safety is better than normal roads and it is possible for people to arrive on time. In these days, the valuation of ride comfort, which is only limited to road transportation, is newly recognized in order to having competitiveness from other transportation. Especially, in the development of the Korean high-speed railroad business, the ride comfort enhancement of tilting train is very important probiem to be solved. Currently, there are international standards of ride comfort such as UIC13, ISO2631. In Korea case, although it has own standard like KS R9216, it mainly depends on the physical parameter such as vibration and noise. So recently, in the valuation of ride comfort, the movements of living parameter technique introduction are increasing on the base of Japan and many developed countries of Europe techniques. Presently, the method of train ride of comfort is mainly based of vibration, that is, mechanical parameter adding selection of variable acceleration and noise. This paper would like to show biological parameter; heart rate and blood pressure variation This method is more direct, based on human body response, than mechanical parameter method. In this experiment, the variability of heart rate and blood pressure of passengers according Lo Lilting angle change of TTX, the Korean tilting train, we are supposed to know that the extent of tilting on the simulation has influence on variability of heart rate and blood pressure, which are living parameter of heart's blood.