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미연 배기가스 점화기술을 적용한 차량의 배기저감 성능에 관한 연구
조용석 국민대학교 생산기술연구소 2003 공학기술논문집 Vol.26 No.-
UEGI(Unburned Exhaust Gas Ignition) is an alternative method for fast light-off of a catalytic converter. It ignites unburned exhaust mixture using two glow plugs installed in the upstream of the close-coupled catalysts(CCC). In addition, a hydrocarbon adsorber was applied to the UEGI system, for more effective reduction of HC emission. Engine bench tests 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. From vehicle tests it was observed that HC emission was reduced effectively, even the catalysts were aged. It is expected to develop a solution kit applicable to a new vehicle or used one, to meet the stringent emission regulation.
조용석,김득상 국민대학교 생산기술연구소 2002 공학기술논문집 Vol.25 No.-
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.
오승묵(Seungmook Oh),Wiil F. Colban,Paul C. Miles 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The cycle-to-cycle variability and potential sources of unburned hydrocarbon (UHC) emissions are examined in a single-cylinder, light-duty diesel test engine operating in low-temperature combustion regimes. A fast flame ionization detector (FID) was employed to examine both cycle-to-cycle emissions behavior. A standard suite of emissions measurements, including CO, CO₂, NOx and soot, was also obtained. Measurements were made spanning a broad range of intake O₂ concentrations-to examine the UHC behavior of dilution-controlled combustion regimes-and spanning a broad range of injection timings-to clarify the behavior of increased UHC emissions in late-injection combustion regimes. Both low- and moderate-loads were investigated. The cycle-resolved UHC data showed that the coefficient of variation of single-cycle UHC did not increase with increases in UHC emissions as either O₂ concentration or injection timing was varied. Additionally, the crank-angle-resolved UHC measurements were coupled with a I-D engine model to examine the variation of exhaust mass flow rate of UHC within each cycle. The results showed that most of the UHC mass exited the cylinder during the latter part of the exhaust process, and that UHCs originating from cylinder wall and piston top quench layers are likely of greater importance than UHCs emitted from quench layers along the head.
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.
SI엔진의 냉간초기 HC 저감을 위한 포집백 및 컨트롤러 개발
김종일,차정연,손정배 조선대학교 환경연구소 2001 環境硏究 Vol.17 No.1
It is well known that unburned hydrocarbons are abundantly emitted into the atmosphere ate cold start in SI engine. Many nations tend to enforce regulations of emission much more strictly. This study was conducted to develop a system which reduces HC emissions at cold start using the device of temporary storage and recombustion after analyzing the emission characteristics of hydrocarbons during the cold start. The exhaust gas measurements are focused upon the first 30 seconds of operation after starting, with the engine and coolant initially at ambient temperature because this period has a major effect on HC emissions, over the FTP cycle. The engine examined is a 4-cylinder, 16-valve SI engine. K type thermocouples attached on the O_2 sensor, the catalytic converter and the coolant, and each sensor for the engine sere connected to the A/D board to find the parameters for storage time and reconbustion mode. The emissions were initially enriched in light fuel alkanes and depleted in heavy aromatic species. It was decided that the maximum storage time was 30 seconds at cold start. The time for storage was decreased with warmed start because the O_2 sensor's conversion at warmed start is much faster than that at cold start. The recombustion mode was selected by using the rate of throttle valve, engine speed, and operation conditions of purge solenoid valve to avoid engine torque fluctuation.