Design and Evaluation of Ultra Multi-Speed Transmission Speed Ratio for Vehicle

• Main Authors: Hong-Sheng Yao, 姚宏昇
• Other Authors: Tyng Liu
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/4hmez7

碩士 === 國立臺灣大學 === 機械工程學研究所 === 106 === The purpose of this study is to develop and to evaluate a new design of selection of transmission gear ratio for passenger cars by analyzing the interrelations between gear ratio, design parameters of ultra multi-speed transmission and performance of engine vehicle. Ultra 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 engine and the powertrain system to optimize the powertrain output. Then, with the matching design parameters of ultra multi-speed transmission, the design principles of ultra multi-speed transmission is analyzed, including gear ratio and shift schedule. Improving the efficiency of engine and performance of vehicle is the main goal of this approach. The main analysis is based on ADVISOR, using NEDC driving cycle of ADVISOR to analysis fuel consumption. Then, a program written in MATLAB is used to simulate performance of vehicle. Finally, the new design of selection of ultra multi-speed transmission is applied and compared with the traditional design of selection for discussing the necessity of ultra multi-speed transmission.