[연료 및 윤활유부문] 연료계통 설계요소가 소형 경유 자동차 저온성능에 미치는 영향

Low temperature operability of the diesel vehicle can not be guaranteed by controlling the low temperature flow characteristics of fuel alone. Proper design of fuel system that matches the fuel properties has to be made to achieve the common purpose. To find the cause of the cold cranking problem recent1y observed mainly with a particular mxIe1light duty diesel vehicles in Korean market, tests have been carried out to determine how the fuel filter design affects the low temperature performance of vehicles in the same category. Representative fuel filter.; have been collected to investigate their char3cteristics in terms of the effective pore size and the filtration area. These characteristics have been assessed against the low temperature test results from both fuel test rig and cold chamber chassis dynamometer operations. The results show that both the effective pore size and the filtration area are critical in determining the low temperature performance of vehicles tested. It has been found that for trouble-free operation of the vehicles at low temperatures down to -20t, it is desirable that the effective pore size is larger than 35 micrometers and the filtration area larger than 3,5OO㎠.