Design and Evaluation of Transmission Gear Ratio for Electric Buses
Date Issued
2014
Date
2014
Author(s)
Liao, Fang-Yi
Abstract
The purpose of this study is to develop and to evaluate a new design of selection of transmission gear ratio for electric buses by analyzing the interrelations between the parameters of transmission system and performance of pure electric vehicle. Multi-speed transmission provides vehicle with larger range of tractive effort and speed, satisfying the performance requirements and also decreasing the energy consumption. The first step is to match the transmission to the electric machine and the powertrain system to optimize the powertrain output. Then, with the matching features and bus driving behavior, a design method of geared transmission system is constructed, including gear ratio and shift schedule. Improving the efficiency of electric machine and economic performance is the main goal of this approach. Also, a bus driving cycle with road grade is proposed in this study. Finally, a program written in MATLAB is used to simulate two buses with different power systems. State of Charge (SOC) is calculated and the result shows the benefits of this new design method.
Subjects
電動大客車
變速箱
減速比
匹配設計
SDGs
Type
thesis
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