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LPG 직분 연료 공급 시스템에서 연료 리턴에 의한 연료 냉각효과 연구
이정호(Jeongho Lee),이종혁(Jonghyeok Lee),이충근(Chunggeun Lee),이진학(Jinhak Lee),이대엽(Daeyup Lee) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
In order to meet the emissions standards for PM and PN, a development of technology for LPG SIDI(Spark Ignition Direct Injection) fuel supply system and for its application are necessary. Prevention of a vapor lock with use of LPG fuel leads to begin this work. The purpose of this work is to provide optimum design methods for preventing the locking of the fuel vapor from the LPG fuel supply system, and contributes to construction of the designed data. An effect of fuel cooling by returning some fuel from the high pressure pump to the fuel tank is identified using a rig system with Butane/propane= 70%/30% fuel, which enables to estimate the increase of temperature to slow down up to max. 1.4 times. As returning amount of fuel increases, an effect of cooling fuel pump varies and thus an excessive use of low pressure pump leads to the durability and fuel economy problems. Therefore, this work suggests the variable control of returning amount of fuel needs to be reviewed and applied. Measured results of temperature change of high pressure pump show that, after heating to high temperature, it is confirmed that a start of return(opening of return valve) lowers(cools) the temperature of high pressure pump. This concludes that low pressure pump(in-tank motor) enables to cool down the high pressure pump and thus reduce the start time at high temperature re-startability.
굴삭기에서 공회전 제한에 의한 연료 소비량 개선 효과 분석 연구
이진학(Jin Hak Lee),이종혁(Jong Hyuk Lee),이정호(Jeong Ho Lee),이대엽(Daeyup Lee),강명철(Myeong Cheol Kang),정진범(Jinbeom Jeong) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In order to cope with the regulated fuel economy in near future for construction machines including excavators, idle stop technology has a potential to be implemented as one of measures to save fuel consumption. Since it has been reported that, in real work sites, excavators idle for significant amount of time between each motion, idle stop technology, which has been widely used for vehicles, is capable of reducing fuel consumption during idling. This study aims to measure fuel consumption of engine idling in an excavator and analyze the amount fuel saving by stopping engine during idle. This work shows that fuel consumption could be reduced up to 13.7% owing to engine stop during idle of a typical excavator used in domestic work site.