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토크 컨버터 영향을 고려한 변속 맵 결정 방법에 관한 연구
이현섭(Hyunsub Lee),신창우(Changwoo Shin),임원식(Wonsik Lim),차석원(Sukwon Cha) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Shift-scheduling has been developed by vehicle speed, throttle valve opening. It was supposed to be revised manually. It takes much time to do for engineers of an automotive industry. In addition, power-train components such as engine, transmission should be considered to create shifting pattern. It is important to consider characteristics of torque converter fluid. In this study, shifting schedules were selected from an engine map and a turbine map. Engine map is able to be converted to turbine map considering capacity factors of torque converter. This study is dealing with some different things between shifting schedules from both maps. Then it will discuss several effects of shift patterns, especially focusing on a turbine map.
김남웅,박성천,임원식 한국기계기술학회 2014 한국기계기술학회지 Vol.16 No.4
The conventional shifting map is developed to enhance the driving performance and fuel economy. According to the driver’s pedaling of accelerator, TCU controls gear ratio in view point of economy or driving performance. In this paper, various reverse engineering is applied to the driving test results of heavy duty AMT vehicle. With the test results, the performance of propulsion source is estimated and basic performance of vehicle is analized. Also the method to derive the shifting schedule according to power or fuel efficient, is developed and compared with the actual shifting map, and various shifting states is estimated. The developed numerical analysis model will be a stepping stone for the shift pattern development and various shift control research
성주연,임원식,박성천,최완묵 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.5
Recently, growing social demand for fuel efficiency improvement has prompted the interest in these highly efficient AMT(Automated Manual Transmission) system and were actively being carried out. In this study, by using a basic engine performance data, the output performance according to the driver’s APS(Accelerator Position Sensor) was segmented. And, power transfer characteristics of 16-step automated manual transmission was analyzed. Also, by combining vehicle load and engines and transmissions, determining of optimum shifting point was studied for the excellent performance report of the vehicle output.
김연호(Yeonho Kim),이희라(Heera Lee),김백유(Beakyou Kim),김현수(Hyunsoo Kim),변성곤(Seonggon Byeon),박정우(Jungwoo Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
the newly developed electric vehicles are equipped with only single speed transmission in order to minimize the drivetrain mass, volume, cost and issue of shift quality. The cost and shift quality are main issues to extend a two or multi-speed transmission to electric vehicle even the two or multi-speed transmission provides advantages of motor size reduction and vehicle Max. speed increase as well as fuel-economy improvement compared to a single speed transmission. This paper introduces the two speed transmission using synchronizer to shift and gives feasibility study on shift quality compared to conventional Automatic transmission in compact-size electric vehicle
김남웅(NamWoong Kim),박영일(Yeong-il Park),임원식(WonSik Lim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Due to the increase of the oil price, the needs for the fuel efficiency improvement of the vehicles are growing and as environmental problems like CO₂ emission be issues, many automotive companies have developed various new technologies to deal with those issues. Automated Manual Transmission(AMT) is one of those technologies. AMT, based on conventional manual transmission, uses various control units and actuators to automate the clutch actuation and gear shift. As manual transmissions main clutch is applied to supply the power from the engine to transmission, compared to the torque converter applied to automatic transmission, AMT improves fuel efficiency and has better responsibility due to the varied shift mode. Also comparing to automatic transmission, it provides the same ease. This paper is to analyze heavy duty track applied AMTs structure, performance characteristics, automated shifting. And compare the data from real vehicle experiments to study the responsibility of shifting control and stability.
전기차용 2단 Synchro. type 변속 구동 시스템 성능 평가
변성곤(Seongon Byeon),박정우(Jungwoo Park),김연호(Yeonho Kim),이희라(Heera Lee),김백유(Beakyou Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this study, a performance simulator for the electric vehicle with two-speed synchro-type transmission was developed. Using the simulator, 2-speed transmission system with selected shifting points and gear ratios were compared with the fixed gear ratio system, and the reduction in the drive motor capacity and the acceleration performance and fuel economy were evaluated. It is found from the simulation results that the maximum velocity, climbing, fuel economy and acceleration performance are improved with 2-speed synchro-type transmission for the same motor specification, and the EV has similar performance with reduced maximum motor torque.
신창우(Chang Woo Shin),최종대(Jongdae Choi),김범수(Beomsoo Kim),임원식(Wonsik Lim),차석원(Sukwon Cha) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Drivers have come to expect better gear shifting since vehicle control systems have been improved. This paper proposes the shifting strategy based on a driver power demand. Dynamic Programming (DP) is used to obtain the optimal gear shift while maximizing fuel economy. The DP problem with fuel economy as the cost function is developed to solve within the power level, which is from 90% to 100% of demanded power. The optimal results at different power levels are combined to generate the shifting map based on the power demand. The driver’s power demand is interpreted as an engine power by the relationship between the accelerator pedal position and the vehicle speed. In order to apply the proposed gear shifting strategy, the vehicle simulation model is implemented on co-simulation. Simulation results show that the proposed shifting strategy improves fuel economy compared with the conventional gear shift map on driving cycles.