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RISS 인기검색어
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- 저자 : 양창석(Changsuck Yang) (검색결과 2 건)
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스파크 점화기관의 냉시동시 배기밸브 타이밍 및 점화시기 변화에 따른 배기가스 온도 및 연소안정성의 변화
김득상(Duksang Kim),박영준(Youngjoon Park),양창석(Changsuck Yang),조용석(Yong-Seok Cho) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.4
The improvement of combustion stability is very important because it is closely related to the exhaust emission concentrations as well as the fuel consumption during the cold start of SI engine. In our previous studies, the spark and exhaust valve timings were retarded individually from the baseline case to increase the exhaust gas temperature for fast warmup of a close-coupled catalyst. In the study, it was found that combustion stability during cold start becomes worse when the valve timing is retarded from the baseline conditions. The spark and valve timings were simultaneously changed from the baseline conditions to find out the variation of combustion stability during cold start of an SI engine. Through the study, retarded spark timing by 5° CA helps improvement of COVimep by 2% and 15℃ increase of exhaust temperature. Retarded exhaust valve timing makes the exhaust gas temperature increase by 30℃, but it also deteriorates the COVimep by 1%.
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[가솔린엔진부문] 미연 배기가스 점화 제어기술을 이용한 배기저감
김득상(Duksang Kim),강봉균(Bonggyun Kang),김성철(Sungchul Kim),이상진(Sangjin Lee),양창석(Changsuck Yang),조용석(Yongseok Cho) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
UEGI (Unburned Exhaust Gas Ignition) is expected to help faster warm up of a close-coupled catalytic convener (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 AIF 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 star1. The UEG I control module proved its effectiveness in precise control of the UEGI system.<br/> <br/> <br/> <br/> - 74p<br/> <br/> <br/> <br/> This paper proposes a method to detect the misfired cylinder using Exhaust Pressure Ascent Rate.<br/> If a misfire occurs, the engine will be lost some power and consumes the more fuel and the torque will be unsteady. Most of all, the misfire affects a bad influence of the 3-way catalyst and emits unburned hydrocarbon in the air.<br/> To prevent these unusual phenomena and eliminate the factor of the environmental pollution. It is an important thing to detect the misfired cylindere.<br/> Experimental results showed that the method using the exhaust pressure ascent rate is proven to be effective in the detection of misfired cylinder on gasoline engine regardless loads and revolutions of the engine
ScienceON
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