Real-time Torque Distribution Strategy for Dual-motor Pure Electric Vehicle with Minimum System Loss

doi:10.3901/JME.2023.22.411

Abstract

Abstract: The torque allocation strategy for dual-motor electric vehicles, based on motor efficiency MAP, overlooks the impact of motor temperature on system losses and the variation in system losses caused by fluctuations in motor input DC voltage due to the dynamic characteristics of the battery. As a result, the overall vehicle powertrain system cannot operate with minimal loss. In response to this issue, a study was conducted on dual-motor electric vehicles with front and rear axles. The temperature characteristics of the motors and the dynamic properties of the batteries were comprehensively considered. A dynamic loss model for the “three-in-one” electric drive system, which includes the inverter, motor, and gearbox, was developed. Based on this model, a real-time torque allocation strategy that minimizes system losses in the drive system was proposed. The simulation and hardware in loop(HIL) testing results demonstrate that by employing a torque allocation strategy based on the real-time minimization of drive system losses, the vehicle's fuel efficiency and adaptability across different driving conditions are effectively enhanced. Additionally, real-time capabilities are exhibited.

Key words: dynamic loss model, torque distribution strategy, real-time minimum system loss, electric drive system

CLC Number:

TG156

CHEN Shuang, HU Minghui, ZHAO Jiawei. Real-time Torque Distribution Strategy for Dual-motor Pure Electric Vehicle with Minimum System Loss[J]. Journal of Mechanical Engineering, 2023, 59(22): 411-423.

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