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전자클러치를 적용한 워터펌프가 엔진에 미치는 영향 분석
조대용(Daeyong Cho),오희창(Heechang Oh),박정서(Jeongseo Park),배충식(Choongsik Bae) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Water pump is operated by engine power from crank shaft. Water pump circulate cooling water in engine to maintain temperature of combustion chamber. Typical water pump is always operated depending on engine rpm. In the early stage after engine starting, warm-up process is began increasing cooling water temperature. But in warm-up process, energy loss is generated until thermal equilibrium condition. To reduce energy loss in warm-up process, electromagnetic clutch is applied to typical water pump. Operation strategy is that water pump is not operated until cooling water temperature in cylinder head reach 85℃. Engine was operated in different condition depends on vehicle speeds. Cooling water temperature and pressure was measured to ensure improvement of engine warm-up process. Fuel consumption rate and exhaust emission was measured to compare different water pump operating strategy. With electromagnetic clutch type water pump, warm-up speed was increased and energy loss from warm-up process was decreased in low speed condition.
조대용(Daeyong Cho),송현우(Hyunwoo Song),오희창(Heechang Oh),박정서(Jeongseo Park),배충식(Choongsik Bae) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this study, water pump pulleys with three different sizes were tested to evaluate effect of water pump system on engine performance. Temperatures and pressures of each part in engine were measured to investigate thermal behavior of cooling water with different pump types. Analysis of engine performance and exhaust gas were conducted. Fuel consumption was measured in each engine operating condition. Finally, experimental results with three types of pump are compared each other to find optimal choice for engine performance. The water pump with smaller size pulley showed longer engine heating time at low speed operation. In contrast, water pump with bigger size pulley showed faster engine heating speed. In fuel consumption, the case of smaller pulley demonstrated lower fuel consumption at medium and high speed; also carbon dioxide and NOx emission was reduced in same case.