Transmission ratio optimization of two-speed gearbox in battery electric passenger vehicles

Gui-Bin Sun,Yi-Jui Chiu,Shen Zhou,Jian-Chao Gan,Ying Li,Wen-Yang Zuo

doi:10.1177/16878140211022869

Gui-Bin Sun, Yi-Jui Chiu + Show 4 more

Open Access

https://doi.org/10.1177/16878140211022869

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Abstract

To optimize the power and economic performance of battery electric passenger vehicles, an 8.5-m-long battery electric passenger vehicle was selected as the research subject. The simulated-annealing particle-swarm-optimization (SAPSO) algorithm was applied to optimize the two-speed gearbox and transmission ratio of the vehicle. With the opening of the accelerator pedal and speed as variables, a comprehensive gear shift schedule that considered both the power and economic performance was established. The comprehensive gear shift schedule curve was defined in the model built in the ADVISOR software. The transmission ratio was jointly optimized using the ADVISOR and ISIGHT software, and then the ADVISOR simulation software was used to analyze the economic and dynamic performances corresponding to the optimized transmission ratio. Finally, we compared the power and economic performances of the vehicle before and after transmission ratio optimization, the results of which showed that after the optimization, the maximum speed, climbing gradient, and 0–50 km/h acceleration time of the vehicle were greatly improved, and the driving range was slightly shortened. This enabled performance advantages of the battery electric passenger vehicle by balancing the power and economic performances of the vehicle.

Highlights

With the rapid development of human civilization, the energy crisis and environmental pollution have become increasingly serious
The results showed that the specific energy consumption of the vehicle was reduced after optimization, and the power factor of the vehicle was significantly improved
The results showed that when optimizing the transmission ratio and motor drive parameters, a selected performance indicator of the electric vehicle, such as the power, economy, or comprehensive performance, could be improved by formulating a proper shift schedule

Summary

Introduction

With the rapid development of human civilization, the energy crisis and environmental pollution have become increasingly serious. The results showed that when optimizing the transmission ratio and motor drive parameters, a selected performance indicator of the electric vehicle, such as the power, economy, or comprehensive performance, could be improved by formulating a proper shift schedule.

Results

Conclusion