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김득상(D. S. Kim),강봉균(B. G. Kang),김성철(S. C. Kim),이상진(S. J. Lee),양창석(C.S. Yang),조용석(Y. S. Cho) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
UEGI (Unburned Exhaust Gas Ignition) is expected to help faster warm up of a close-coupled catalytic converter (CCC) by igniting the unburned exhaust mixture using two glow plugs installed in the upstream of the catalyst. In this study, a control module and an algorithm for the UEGI technology was developed. It changes I/O signals from the ECU, and controls ignition signals, glow plug on/off signals, and cooling water temperature signals to modify A/F ratios during cold start of the test engine. The control module is also designed to be readily applicable to a conventional vehicle, therefore, its repeatability, stability of UEGI flame, precision of light-off time and performance characteristics were tested and analyzed on an engine test bench. In addition, both the UEGI system and a hydrocarbon adsorber were applied to the exhaust system for more effective reduction of HC emission during the cold start period. Experimental results show that the CCC reaches the light-off temperature faster compared with the Baseline exhaust system, and HC and CO emissions are reduced significantly during the cold start. The UEGI control module proved its effectiveness in precise control of the UEGI system.
Close-Coupled Catalysic Converter 입구의 유동분포 측정 및 수치해석
조용석(Y.S.Cho),김창래(C.R.Kim),김득상(D.S.Kim),이윤석(Y.S.Lee),주영철(J.Y.Joo),한민섭(M.S.Han) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Results from an experimental study of flow distribution in a close-coupled catalytic converter (CCC) are presented. The experiments were carried out with a flow measurement system. Two cases were studied; steady flow condition and transient flow condition. The flow distribution at the exit of the first monolith of the CCC was measured with a pitot tube. Results from numerical analysis are also presented.<br/> Experimental results showed that the uniformity index of exhaust gas velocity decreases as Reynolds number increases. In steady flow conditions, the flow through each exhaust pipe makes the flow concentrate on a small region of the CCC inlet. On the other hand, the transient test results showed that the flow through each exhaust pipe in the engine firing order interacts with each other to make the flow distribution uniform. The results from numerical analysis support the experimental results, and help explain the flow in the entry region of the CCC.<br/>
LDV 와 유동가시화를 이용한 CCC 입구의 유동분포 측정 및 수치해석
조용석(Y.S.Cho),김득상(D.S.Kim),정태용(T.Y.Jung),왕희준(H.J.Wang),김용관(Y.K.Kim),주영철(Y.C.Joo),한민섭(M.s.Han) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
Results from an experimental study of flow distribution in a close-coupled catalytic converter (CCC) are presented. The experiments were carried out with a flow measurement system under steady and transient flow conditions. The flow distribution of the CCC was measured by LDV system and flow visualization. Results from numerical analysis are also presented.<br/> Experimental results showed that in steady flow conditions, the flow through each exhaust pipe made some flow concentrations on a small region of the CCC inlet. The transient test results showed that the flow through each exhaust pipe in the engine firing order interacted with each other to make the flow distribution uniform. The results of numerical analysis supported the experimental results, and helped explain the flow in the entry region of CCC.<br/>
조용석(Y.S.Cho),김득상(D.S.Kim),이윤석(Y.S.Lee),송대근(D.K.Song),주영철(Y.C.Joo),한민섭(M.S.Han) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
Results from an experimental study to measure the conversion efficiency of a close-coupled catalytic converter (CCC) are presented. Exhaust gases upstream and downstream of the catalyst are sampled by a sampling probe, and analyzed by an exhaust gas analyzer. The distribution of the exhaust species and catalyst conversion efficiency over the catalyst face is compared with the velocity distribution in the catalytic converter.<br/> Results showed that the conversion efficiency is not strongly dependent on the velocity distribution, but the species concentration distribution correlates well with the velocity distribution. It was found that the non-uniform velocity distribution results in non -uniform species distribution over the catalyst face and speed up the aging process in a specific region of the catalyst.<br/>