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자동차 냉각 성능 향상으로 인한 배기 및 연비 저감에 대한 연구
문병헌(Byungheun Moon),이기형(Kihyung Lee),김기범(Kibum Kim),최경욱(Kyungwook Choi) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The automotive cooling inventory is normally designed such that it can endure the excessive heat load situations that occur sporadically. Considering most normal driving modes, the cooling systems are unnecessarily large, which increases harmful emissions and fuel consumption of vehicles. An experimental study was carried out to evaluate a novel automotive cooling strategy using the latent heat of a phase change material (PCM) that made it possible to downsize the automotive engine cooling system. The heat load averaging capability of the PCM led to around 35% decrease in cooling system, and the engine warm-up time reduced around 60% as a result of downsizing the cooling system. In addition, severe coolant temperature shaking was successfully averaged out in the downsized cooling system with a heat accumulator containing PCM. This innovative cooling concept will definitely contribute to a considerable improvement in terms of fuel economy and emissions characteristics of vehicles by achieving stable combustion condition of engines as well as reducing total body weight. The more detailed discussion will be presented in the manuscript.
EGR gas 온도에 따른 디젤 엔진의 연소 특성에 관한 연구
최경욱(Kyungwook Choi),문병헌(Byungheun Moon),김기범(Kibum Kim),이기형(Kihyung Lee) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
To satisfy stringent regulations on CO2 emission causing greenhouse effect automotive manufacturers have recently paid attention on a diesel engine. In this paper, low temperature cooling circuit strategy was proposed to control EGR gas temperature and charged air temperature. The cooling system in a High Speed Direct Injection Diesel Engine was modified for the purpose of this study and the strategy was tested in a stationary test bench. As a result, temperature of the coolant passing through EGR cooler could be decreased leading to increase in charging efficiency of EGR gas. Emission and Fuel consumption were improved by controlling the EGR gas temperature.