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정연민(Yeonmin Cheong) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Friction plate temperature of a wet start clutch is calculated and compared with the experiment. Not only the conduction and convection heat transfer around the separation plate but also the evaporation effect of the oil are taken into account to assess the cooling of the separation plate. Temperature model for the off-line simulation is simplified to be applicable to the real time calculation in a transmission control unit. The predicted temperature shows good agreement with the experimental results. This model can be also used to evaluate the heat capacity of the shifting clutch of the automatic transmission.
정연민(Yeonmin Cheong),이주형(Juhyeong Lee),이창욱(Changwook Lee),손우철(Woochurl Son) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Power Loss in a pushing metal V-belt continuously variable transmission is analysed and compared with the experiment. Belt Losses at band-band, band-block and block-pulley interfaces are calculated taking the pulley deflection into account. Other losses at the oil pump, clutches, gears, bearings and seals are included to estimate the total loss of CVT. The predicted loss showed good agreement with the experimental results. Investigation into the influence of the apply pressure of the pulley on the loss showed that the apply pressure should be controlled as low as possible to increase the efficiency of the transmission.
[동력전달계부문] HIVEC 4속 자동변속기 변속특성해석 (Part 2) - 동력전달계 변속과도특성 -
심현수(Hyunsoo Shim),정연민(Yeonmin Cheong) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Dynamic simulation program is developed to predict the effect of control logic and parameter in TCU of HIVEC automatic transmission. Dynamic equations describing the torque phase and inertia phase during the shift are derived and solved for power-on 2-3 upshift. Simulation results are compared with test results to validate the feasibility of simulation model. The effect of control parameters, such as, P,I,D gains of controller, the fill time of applying element, initial engagement duty are evaluated theoretically. Using this program. it is possible to confirm control logic and its parameter
클러치 내부 오일 유동해석 기법을 통한 오일 공급홀 최적화
김학기(Hakki Kim),송경(Kyoung Song),박재인(JaeIn Park),정연민(YeonMin Cheong),황동환(DongHwan Hwang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The flow rate and the behavior of the automatic transmission fluid (ATF) from a input shaft to the clutch plates have been simulated as a three-dimensional and transient-state using the free surface method of commercial CFD code STAR-CD. During disengagement of the wet clutch plates, amount of heat energy dissipated by the lubricating oil that flow the nominalgap between the plates which have relative rotating speed. To supply the oil equally into the nominal clearances among the friction plates, a lay out of the lubrication passage hole configuration is very important. Since a hole configuration can be changed by the hole number, shape and the position at the hub, the optimization of the oil hole configuration is necessary. It is difficult to estimate the flow rate of the lubricating oil exactly at each part of the automatic transmission because of its structural complexity under rotating conditions. This paper suggest the oil hole configurations which can distribute the ATF uniformly around the multi-plates with the optimization method. From this result, we can obtain various information about the lubricating state at every part of the plates and can help our judgment of whether lubrication is sufficient