ANALYSIS OF THE SHIFTING BEHAVIOR OF A NOVEL CLUTCHLESS GEARED SMART TRANSMISSION

다국어 초록 (Multilingual Abstract)

Conventional geared transmissions use some kinds of clutches to control the power flow from an internalcombustion engine to the driveline while shifting gears. However, the shifting performance is seriously affected by the clutchengagement and an unavoidable drop in the torque may occur when the clutch is disconnected. Moreover, wear of the clutch,the need for hydraulic equipment, and the load limit may together aggravate the limits of the clutch system. For this reason,as a novel transmission without a clutch, the clutchless geared smart transmission (henceforth CGST) is proposed by ourresearch team. The CGST controls the power flow in a multiple-input gear-train by controlling the electric motor attached tothe planetary gear system. However, no CGST has been realized in an actual vehicle thus far, and the performance has beenpredicted only theoretically. In this research, we analyzed the achievable performance based on a developed CGST dynamicmodel with a typical CGST structure. In addition, a CGST gear-shifting algorithm is proposed for use with the dynamic model.
From the simulation results, the CGST does not show an abrupt drop in its torque or oscillation while shifting gears due tothe absence of a discontinuous power flow. The developed dynamic model can serve as a performance reference for the CGST.
Moreover, it can be used as a simulation tool for developing a gear-shifting control logic scheme.

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