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CGST의 구조적 다양성 및 동역학 시뮬레이션을 통한 변속 특성 분석
김선제(Sun Je Kim),송치웅(Chiwoong Song),김경수(Kyung-Soo Kim),윤용산(Yong-San Yoon) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Existing clutched automotive transmissions have problems with wear of disc pad caused by thermal stresses in frictional disc, need of hydraulic equipment, and degradation of longitudinal drivability by instantaneous disconnection of power delivery during shifting gears. Recently, to address the difficulties with the clutches we proposed the novel hybrid capable transmission system so-called clutchless geared smart transmission(CGST), which uses a planetary gear system and an electric motor instead of a clutch. The CGST can be divided into various structures according to the order of arrangement and connections between shafts. In this research, we propose two types of representative structure of CGST(named TP, PT type) and analyze the operational characteristics during shifting gears to suggest the standards for design. First of all, the dynamic models of CGST structures are developed in MATLAB/Simulink environment. Simulation results show that two CGST types have different motor dynamics during shifting gears by arrangement of a planetary gear system and a multiple-input gear-train. In TP type of CGST, as the power from the engine is transferred to the planetary gear system through multiple-input gear-train, the input torque is magnified and the speed is reduced by a gear mesh of gear-train. In this reason, the TP type requires the motor having higher torque capability, and PT type requires faster motor. In terms of load on the planetary gear system, the larger torque load is applied to TP type than PT type. This distinction conditions during shifting gears lead differences in design parameters when the CGST is applied to an automobile. Therefore, the proper structure of CGST should be chosen to match the operational environment and specification of vehicle based on the results of this research.