Energy Coordination Control Strategy with Layered Constraints for Mild Hybrid Electric Vehicles

doi:10.3901/JME.2025.06.268

Abstract

Abstract: An energy coordination control strategy with layered constraints is proposed for the problem of poor dynamic characteristics of mild hybrid electric vehicles under transient conditions. The dynamic model of the power system is established, the coupling constraints of the power system are obtained by simulating the vehicle acceleration process, the key factor restricting the dynamic characteristics of the vehicle is obtained through the simulation analysis of the turbocharging system. Then, an energy coordination control strategy with Layered constraints is proposed. The bottom layer constrains the generator torque by the theoretical maximum load torque of the engine at the smoke limit oil, and the top layer constrains the motor power by the power supply capacity of the system. The effectiveness of the proposed strategy is verified by simulation. The results show that compared with the traditional strategy, the proposed strategy can effectively coordinate the loading process of the engine-generator set, greatly shorten the response time of the engine-generator set from idle speed to rated power, significantly improve the acceleration performance of the vehicle, and provide a new technical approach for optimizing the dynamic characteristics of series mild hybrid electric vehicles.

Key words: mild hybrid electric vehicle, constraint condition, coordinated control, engine-generator set, dynamic characteristics

CLC Number:

TJ810

Lü Hang, SHANG Xianhe, ZHAO Changlu, HAN Xuefeng, YANG Zhanhua, ZHANG Fujun. Energy Coordination Control Strategy with Layered Constraints for Mild Hybrid Electric Vehicles[J]. Journal of Mechanical Engineering, 2025, 61(6): 268-276.

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