Abstract
The number of electric vehicles (EVs) has increased sharply with the start of the 21st century. Although the automobile industry believes that drivetrains equipped with two-speed transmission can increase the energy efficiency of EVs by 4–5% and improve other vehicle performance indicators, most EVs still use fixed-speed ratio reducers. Does the two-speed transmission make sense? What is the latest development in the industry? What are the reasons this has not yet been popularized? This article attempts to analyze the current situation in-depth and provide a forecast of technology development trends. First, the authors analyze the advantages of the two-speed transmission from the energy consumption, economy, dynamic performance, and other indicators of EVs. Second, the topology optimization of the non-power-interruption two-speed transmission is introduced, and many efforts have been made to analyze the numerous studies both in academic research and industrial development. Then, a unified index for the necessity of adopting a two-speed transmission in EVs is given, which is verified by numerous data of different passenger cars and commercial vehicles. Finally, the authors predict that two-speed transmissions will be used first in sports cars, luxury cars, and electric logistics vehicles within several years, and then gradually penetrate ordinary family cars.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
