Abstract
Aiming at the braking energy feedback control in the optimal energy recovery of the two‐motor dual‐axis drive electric vehicle (EV), the efficiency numerical simulation model based on the permanent magnet synchronous motor loss was established. At the same time, under different speed and braking conditions, based on maximum recovery efficiency and data calculation of motor system, the optimization motor braking torque distribution model was established. Thus, the distribution rule of the power optimization for the front and rear electric mechanism was obtained. This paper takes the Economic Commission of Europe (ECE) braking safety regulation as the constraint condition, and finally, a new regenerative braking torque distribution strategy numerical simulation was developed. The simulation model of Simulink and CarSim was established based on the simulation object. The numerical simulation results show that under the proposed strategy, the average utilization efficiency of the motor system is increased by 3.24% compared with the I based braking force distribution strategy. Moreover, it is 9.95% higher than the maximum braking energy recovery strategy of the front axle. Finally, through the driving behavior of the driver obtained from the big data platform, we analyze how the automobile braking force matches with the driver’s driving behavior. It also analyzes how the automobile braking force matches the energy recovery efficiency. The research results in this paper provide a reference for the future calculation of braking force feedback control system based on big data of new energy vehicles. It also provides a reference for the modeling of brake feedback control system.
Highlights
This paper focuses on the optimization of motor power generation efficiency in the dual axle drive pure electric vehicle during the feedback braking process
On the basis of this method, the safety factors such as Economic Commission of Europe (ECE) regulations and ideal braking force distribution are taken as constraints
We have developed a new energy recovery strategy for dual drive pure electric vehicles
Summary
This text was structured as follows: after mechanism analysis and model establishment of braking energy feedback, Section 3 analyzes regenerative braking strategy of dual axle drive pure electric vehicle. Vehicle controller has the motor loss model to calculate the regenerative braking torque of the front and rear motors under the maximum loss energy recovery efficiency and calculate the compensation braking torque according to the driving behavior characteristics. According to the above, improving the dual motor efficiency can realize the optimal energy recovery of dual axle drive pure electric vehicle for feedback braking.
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