Design, analysis, and experimental validation of a novel seamless automatic transmission for electric vehicle

The transmission system has an important influence on the dynamic performance, endurance mileage, and energy saving in an all-electric vehicle. This article proposes an innovative two-speed seamless dry-friction automatic transmission system to improve the dynamic performance and endurance mileage o...

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Bibliographic Details
Published in:Advances in mechanical engineering 2018-02, Vol.10 (2)
Main Authors: Yu, Jie, Yao, Ligang, Ren, Chengcheng, Yan, Xiaolei, Lin, Li
Format: Article
Language:English
Subjects:
Authorship
Automatic transmissions
Batteries
Brake linings
Durability
Dynamic models
Efficiency
Electric vehicles
Endurance
Energy conservation
Energy consumption
Friction
Fuel consumption
Genetic algorithms
Optimization
Power consumption
Ring gears
Simulation
Velocity
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Summary:The transmission system has an important influence on the dynamic performance, endurance mileage, and energy saving in an all-electric vehicle. This article proposes an innovative two-speed seamless dry-friction automatic transmission system to improve the dynamic performance and endurance mileage of an all-electric vehicle with the existing battery technology. The proposed system consists of two-stage epicyclical gear sets without outer ring gears, a dry-friction clutch, and a brake band, realizes a seamless shifting between any two speeds in an electric vehicle. Based on the working principle and dynamic modeling of the proposed seamless dry-friction automatic transmission system, the ratio optimization was carried out to improve the dynamic performance and the power consumption at the same time, and the combination of the weight ratio method and the multi-island genetic algorithm method was introduced to solve the optimization problem. It is shown both theoretically and experimentally that the proposed seamless dry-friction automatic transmission method demonstrates a better dynamic performance and shifting comfort when compared to the automated manual transmission with same transmission ratio.
ISSN:1687-8132
1687-8140
DOI:10.1177/1687814018760021