Abstract
High driving efficiency remains challenging in autonomous electric vehicles, especially in small electric vehicle subtype. Here, we reported investigation of the structure and requirements of the drive system for those vehicles, while the motor‐drive axle combined integrated driving scheme has been chosen. In the study, the power matching of drive motor as well as transmission ratio has been calculated based on the performance of the small electric vehicles, and the total gear ratio of 8.124 was determined. For better comprehensive performance and efficiency, the two‐stage retarder has been designed, in which elements including high‐speed shaft, low‐speed shaft, gears, and differential have been examined to ensure their proof strength when the motor outputs reached the maximum torque. Notably, by utilizing topology optimization, Gear 4, the transmission unit with the heaviest weight percentage has been modified in a lightweight way, achieving a 41% reduction of the mass in emulation analysis and turned up to the target of optimization eventually.
Highlights
Energy conservation and environmental protection remain a great global social concern, with great attention on the development and applications of energy-saving and emission reduction technology in the industry and daily life. It is widely accepted in the reduction of carbon emission, and particular carbon emission management has been established in some countries and regions
Fossil fuels are the common energy resources for traditional vehicles, which has been identified as the pivotal field for carbon emission governance
Energy-saving and emission reduction technology leads the development of vehicles, in which technology for new energy vehicles holds priority by research institutions and auto enterprises
Summary
Energy conservation and environmental protection remain a great global social concern, with great attention on the development and applications of energy-saving and emission reduction technology in the industry and daily life. It is widely accepted in the reduction of carbon emission, and particular carbon emission management has been established in some countries and regions. We designed the transmission system of the electric vehicles and optimized the driving system by reducing the weight of transmission units following the requirements, for further enhancement of dynamic performance of the vehicles [1,2,3]
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