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연비주행사이클의 냉간조건에서 엔진 냉각수 제어밸브 개폐에 따른 연료소비량 변화에 관한 실험적 연구
이창인(Changin Lee),송춘섭(Chunsub Song),한수지(Sooji Han) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
Fuel Consumption of vehicle is affected and determined by combustion efficiency of engine and friction of driveline. Specially, when vehicle is in a cold condition, the effect is much bigger owing to heat loss from low temperature of combustion chamber and friction from low temperature of engine oil and transmission oil. In this paper, one thing is found which control system would be more advantageous from a fuel consumption perspective, for coolant of cylinder head quickly warmed up in a cold condition between using the coolant to be increased temperature for high fuel efficiency and using the coolant to be reduced friction of engine oil and transmission oil through experimental method from NEDC, WLTC and UDDS. For this control, it’s realized through CCV which is adjusted flow path of coolant, and timing of open and close for CCV as per each test cycle is decided on 120℃ metal temperature of cylinder head. As a result of NEDC and WLTC, fuel consumption is improved on CCV close test right after test cycles begin. This is considered more beneficial that CCV close test in a cold condition increases temperature of combustion chamber, makes higher fuel efficiency, and decreases DFCO start timing from fast coolant temperature rise than CCV open test. At UDDS in a cold condition, fuel consumption according to CCV open and close shows less than the result of NEDC & WLTC. In case of UDDS, there are more of acceleration and high speed at the test cycle than NEDC & WLTC, therefore CCV opens fast, the time for high fuel efficiency period is short, and DFCO activated time is the same regardless of CCV open & close.