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자동변속기 효율 예측을 위한 마찰요소 손실에 관한 연구
이륙(Ryuk Lee),박상민(SangMin Park),김철진(CheolJin Kim) 한국트라이볼로지학회 2013 한국트라이볼로지학회 학술대회 Vol.2013 No.10
Loss factors of automatic transmission include gear efficiency of oil pump and drag loss of friction factors (Wet type Multidisc Clutch, Brake). Among these factors, this study will observe the potential causes of drag loss, the most influential factor. A simple method is suggested to calculate the drage loss of friction factors in order to predict the power transfer efficiency for a newly designed automatic transmission. The result of a computational fluid analysis program and a free load test are compared in order to verify the suggested method. A calculating of the friction’s drag loss enhances the accuracy by reflecting the inflow air content which is produced due to the relative rotation of friction factors with the existing calculation. The amount of the output of air after applying various grooves to the computational fluid program is then apparent in the calculation. This study aims to improve the prediction of mileage accuracy in order to advance the initial design of an automatic transmission.
이륙(Ryuk Lee),김정민(Jeongmin Kim),김동현(Donghyun Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper investigates the wheel slip control and vehicle stability control for an in-wheel motor independent drive electric vehicle. A control algorithm is proposed to maintain the desired slip ratio of the each wheel by the independent motor torque control. Based on the 15 DOF vehicle model, a performance simulator is developed. It is found from the simulation results that the vehicle performance and stability can be improved by the independent in-wheel motor control.
변속기 효율 예측을 위한 습식 마찰요소 손실 계산법에 관한 연구
이륙(Ryuk Lee),박상민(Sangmin Park),김철진(Cheoljin Kim) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Loss factors of transmission include gear efficiency, loss of oil pump and drag loss of friction factors (Wet type Multidisc Clutch, Brake). Among these factors, this study will observe the potential causes of drag loss, the most influential factor. A simple method is suggested to calculate the drag loss of friction factors in order to predict the power transfer efficiency for a newly designed transmission. The result of a computational fluid analysis program and a free load test are compared in order to verify the suggested method. A calculating of the friction’s drag loss enhances the accuracy by reflecting the inflow air content which is produced due to the relative rotation of friction factors with the existing calculation. The amount of the output of air after applying various grooves to the computational fluid program is then apparent in the calculation. This study aims to improve the prediction of mileage accuracy in order to advance the initial design of an automatic transmission.
홍명철(Myungchul Hong),이흥규(Heungkyu Lee),이륙(Ryuk Lee),황현수(Hyunsoo Hwang),김태준,김홍민(Hongmin Kim) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
Although oil pump is essential part to produces oil flow to the transmission components, over-design of the oil pump causes power loss in automatic transmission. By using optimized oil pump displacement with 2 pump system which has mechanical oil pump and electric oil pump can reduce power loss of automatic transmission. This paper introduces development process of 2 pump system and proposes how to increase the transmission efficiency with 2pump system in automatic transmission.
토크 컨버터 사양에 따른 차량 연비 및 동력성능에 대한 연구
홍명철(Myungchul Hong),이웅철(Woongchul Lee),이륙(Lee Ryuk),이흥규(Heungkyu Lee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Torque converter of automatic transmission transmits the power from engine to vehicle with its fluid parts and lock up clutch. In order to enhance vehicle performance, torque converter has to be multiplied, but in this case power loss by fluid parts necessarily occurs. On the other hand, to improve the fuel efficiency, the vehicle must be operated in a direct state using the lock up clutch of the torque converter. Therefore it is necessary to study the types of torque converter such as torsion spring stiffness, lock up rpm, inertia of engine side and transmission side to improve fuel efficiency and vehicle performance. This study will propose optimized torque converter for fuel efficiency and vehicle performance of passenger car and SUV vehicles with analysis and test of torsional vibration model of driveline.