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체크밸브 유무에 따른 HEV용 유압제어시스템의 유압변화에 대한 연구
조승범(Seungbeom Cho),나병철(Byungchul Na),김진용(Jinyong Kim),박승욱(Seunguk Park),최현주(Hyunju Choi),정진은(Jin-Eun Chung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
An automatic transmission (AT) shifts gears by controlling hydraulic control valves. Sufficient supply of an oil for running AT, in general, is received from a mechanical oil pump. However, for a hybrid electric vehicle, AT is consists of an parallel oil supply system added an electric oil pump for controlling idle stop-and-go system. In this system a check valve as well as clearance of pump is required for blocking the reverse flow of oil in a fluid power circuit. While operating a hydraulic system without and with a check valve, the current study provides the variation of independently hydraulic property for each oil pump two different oil viscosities at 40℃ and 85℃. As a result, pump response to hydraulic control and the flow rate of oil pressure in this system was improved. It obtained the desired oil pressure at 40℃ because of the higher viscosity of an oil. On the other hand, instead of running equipped with a check valve, running without a check valve at 80℃ had lower hydraulic property and pump response because of the reverse flow of oil at the beginning.
하이브리드 변속기 밸브바디의 압력, 온도 변화에 따른 윤활오일유량 분배 특성 연구
김진용(Jinyong Kim),나병철(Byungchul Na),조승범(Seungbeom Cho),심재경(Jaekyung Shim),최현주(Hyunju Choi),박승욱(Seunguk Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In general, a valve body of the automatic transmission (AT) is controlled by the clutch, the brake and lubricating oil flow in a hydraulic system and lubricant flow for each valve can be adjusted independently. To increase the lifetime of AT, the lubrication flow rate in a valve body for a 6 speed AT based parallel hybrid electric vehicle must be provided with proper oil distribution and control. In this study, we carried out several experiments without the inner parts of AT and with a AT assembly. The variation of the flow rate on oil temperature and pressure between an oil supply port and the outlets of the lubrication port was evaluated and analyzed. In the case of AT without the inner parts, it was evident that as the oil required for an operation of the clutch and brake was discharged from the outlet port, the flow rate from each lubrication port is decreased. However, the flow rate of the AT assembly was slightly increased. In addition, the lubrication flow rate was increased with increasing the oil temperature, and also it was reduced with increasing the oil pressure. Details of the resulting data are discussed.
동력손실 저감을 위한 Tappet 부품의 트라이볼로지 특성에 관한연구
서준호(JoonHo Seo),임대순(DaeSoon Lim),김진용(JinYong Kim),박승욱(SeungUk Park),조승범(SeungBeom Cho),나병철(ByungChul Na) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
The wear of the contact in the tappet accounts for the greatest portion of entire friction loss of an engine, leading to the occurrence of abnormal wear. The coated specimens for cam-tappet wear test were producted by using PVD-Sputtering coating method. It examined the friction characteristics occurring between the cam and the tappet by using the dedicated wear tester and found that the friction torque value was reduced through comparison testing with the existing part when the low friction coating was applied. So application of the low friction coating to actual vehicles will reduce the fuel economy and occurrence of noise-vibration.
실린더 해드커버 일체형 오일분리장치의 성능평가에 관한 연구
서준호(Joonho Seo),나병철(Byungchul Na),김진용(Jinyong Kim),박승욱(Seunguk Park),김현철(Hyunchul Kim),조승범(Seungbeom Cho),임대순(DaeSoon Lim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This research aims to develop parts for Advanced Fuel/Oil Filtering Re-circulation applicable to this kind of regulation proof engines. These parts can play a role of converting traditional air emission type crankcase into recovery type crankcase so that the engine can deal with environmental regulations, which do not allow minimal amount of toxic gas discharge. For the experiment, test method and specially made testing equipment are prepared. The results showed that Oil separation efficiency of the oil separator was about 60% in 4000rpm and 6000rpm condition.