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Engine Warm-up 기간의 Zero Coolant 적용에 관한 연구
조원준(Wonjoon Cho),최경욱(Kyungwook Choi),김형익(Hyungik Kim),이기형(Kihyung Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, there has been an interest in intelligent cooling system as it has the potential of achieving a better fuel economy and emission reduction. It is possible mainly due to the higher coolant temperature during engine warm-up and low speed/part-load conditions. Thus the purpose of our study was to investigate the relationship between zero coolant strategy and fuel consumption. A coolant flow test system was set for acquisition of coolant flow rate, pressure distribution and coolant temperature. Thease results were used for experimental data to validate the 1-D CFD code, Flowmaster2. From this study, we found that the zero coolant strategy improved fuel economy and emission reduction on the engine warm-up, and this results can be used for engine cooling system simulation model.
조현철 ( Hyunchul Cho ),최성덕 ( Sungduk Choi ),정동재 ( Dongjae Jung ),유재훈 ( Jaehoon Yoo ),류원석 ( Wonseok Ryu ),조원준 ( Wonjoon Cho ),송하주 ( Ha-joo Song ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1
스마트폰에 장착된 센서들을 사용하면 다양한 물리량을 측정할 수 있다. 본 논문에서는 스마트폰을 사용하여 물체의 높이를 추정하는 기법을 제시한다. 제안 기법은 물체를 여러 위치에서 관측하여 그 높이를 추정하는 것이다. 각 각의 관측점에서는 스마트폰의 위치센서와 방향센서를 사용하여 관측점의 위치와 관측 방향을 측정한다. 이러한 관측값을 기반으로 각 관측점에서 물체로 향하는 3차원 시선벡터를 도출하고 그것들 간의 최근접점을 계산하여 물체의 높이를 추정한다. 제안 기법을 모바일엠으로 구현하고 건축물 높이를 측정하는 실험을 통해 성능을 시험하였다.
냉각 시스템 제어에 따른 디젤 엔진의 배기가스 저감에 관한 연구
최경욱(Kyungwook Choi),조원준(Wonjoon Cho),이기형(Kihyung Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
These days the exhaustion of petroleum resources and environmental problems are getting serious. Many researchers are focused on low emission and high performance vehicles. Therefore, we should concern about emission regulation when we design a new car. In this study, we investigated the characteristics of the traditional mechanical engine cooling systems which control the engine temperature using engine speed and wax type thermostat. This experiment used three components which are Radiator fan, water pump and water valve controlled by an electronic system based on the engine status (load, speed). We elucidated how different between traditional mechanical cooling system and electronic cooling system which control coolant temperature and coolant flow rate in a DI diesel engine in this paper. The results revealed a fuel saving and an emission (CO, HC) reduction on NEDC cycle.
김형익(Hyung-ik Kim),조원준(Wonjoon Cho),이기형(Kihyung Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, there has been an interest in intelligent cooling system as it has the potential of achieving a better fuel economy and emission reduction. It is possible mainly due to the higher coolant temperature during engine warm-up and low speed/part-load conditions. Thus the purpose of our study was to investigate the relationship between engine coolant temperature and fuel consumption. A coolant flow test rig was set for acquisition of coolant flow rate and pressure distribution. These results were used for experimental data to validate the 1-D CFD codes, Flowmaster2 & WAVE. The coolant circuit model was well matched by 2% or less error. Therefore, the engine cooling system was able to simulate by using the model. From this study, we found that the coolant flow distribution has close relationship with coolant temperature on the engine warm-up, and this results can be used for engine cooling system simulation model.
김형익(Hyung-ik Kim),조원준(Wonjoon Cho),이기형(Kihyung Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The mechanical friction losses of engine has a great effect on fuel economy. To improve the vehicle fuel economy, various technologies such as improvement of powertrain efficiency, use of light weight material, improvement of aerodynamic design, have been studied. One of the possible way to improve the vehicle fuel economy is to reduce the engine friction loss by the engine oil characteristics. In this study, the friction characteristics of engine components according to the engine oil temperature was investigated by using strip-down method. From the result, we obtained the optimum temperature of engine oil for reducing mechanical friction loss and provided experimental data about the effect of engine components on friction loss.