Design of Optimized Energy Management Strategy for All-Wheel-Drive Electric Vehicles

Haishi Dou,Youtong Zhang,Likang Fan

doi:10.3390/app11178218

Haishi Dou, Youtong Zhang + Show 1 more

Open Access

https://doi.org/10.3390/app11178218

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Journal: Applied Sciences	Publication Date: Sep 4, 2021
Citations: 6	License type: CC BY 4.0

Affiliation: Beijing Institute of Technology

Abstract

The performance of the all-wheel-drive electric vehicle is inseparable from the energy management strategy (EMS). An outstanding EMS could extend the cycling mileage, coordinating the power output of the battery and exerts the advantage of the motor comprehensively. However, the current EMS has poor performance in real-time, and this paper proposes the dynamic programming coordination strategy (DPCS) to solve the problem. Firstly, the EMS based on a rule-based control strategy (RBCS) is applied in a different driving cycle. Secondly, the dynamic programming algorithm (DP) is proposed in the process. The DPCS cooperated the advantage of RBCS and DP, extracting the boundary parameters along with the demand power and vehicle speed. Finally, the number of motors joined in the driving condition is elucidated and the method obtains the optimal torque split ratio through a partly-known driving cycle. By incorporating the thought of a basis of rules, the DPCS determines the torque of each motor that confirm the motor working in an efficient range that incorporates the mind of dynamic programming. The method is validated through the simulation. The results show that the strategy can significantly improve the mileage of the driving cycle, with comprehensive performance in energy distribution and utilization.

Highlights

To display the different power demands at various speeds, the three typical driving conditions are used in parameter extraction with the help of a rule-based control strategy (RBCS)
In practical application, the rapid prototyping controller will be incorporated in the vehicle control unit (VCU) which in rule-based control strategy (RBCS) or dynamic programming coordination strategy (DPCS), the threshold of speed (25 km/h) and accelerator pedal opening indicate that the power demand will be incorporated in the control strategy
This paper proposed energy management for all-wheel-drive electric vehicles based paper proposed all-wheel-drive electric vehicles on theThis partly-known driving energy cycle

Summary

Introduction

With the development of battery technology, pure electric vehicles occupy an increasingly large proportion of the way people travel nowadays. The electric configuration can briefly be divided into driving by front motor, rear motor, and driving by four in-wheel motor. The difference in each vehicle configuration is that the power and the control strategy used in each model are different. Electric vehicles (EVs), with the benefit of low cost and zero-emission [1,2], are widely used. The EV has the advantage of high torque reserve at low speed in the driving system, which can realize the shift frequently switch in the start–stop mode and with the recovery of braking energy [3,4,5]

Methods

Results

Conclusion