Administrator by China Associction for Science and Technology
Sponsored by China Society of Automotive Engineers
Published by AUTO FAN Magazine Co. Ltd.

Automotive Engineering ›› 2023, Vol. 45 ›› Issue (10): 1908-1922.doi: 10.19562/j.chinasae.qcgc.2023.10.012

Special Issue: 新能源汽车技术-电驱动&能量管理2023年

Previous Articles     Next Articles

Power Split Hybrid System Mode Transition Performance Test Method Based on Load Compensation

Haodi Li,Zhiguo Zhao(),Peng Tang,Yongping Hou   

  1. School of Automotive Studies,Tongji University,Shanghai 201804
  • Received:2023-03-07 Revised:2023-04-18 Online:2023-10-25 Published:2023-10-23
  • Contact: Zhiguo Zhao E-mail:zhiguozhao@tongji.edu.cn

Abstract:

Due to the difference between the dynamic characteristics of the power split hybrid system performance test bench and the actual vehicle, it is difficult for the test bench to accurately emulate the driving load characteristics of the actual vehicle, so the accuracy of the mode transition performance test of the power split hybrid system is poor. Therefore, a test method based on load dynamic compensation is proposed for mode transition performance of power split hybrid system in this paper. Firstly, a bench system dynamics model is established, considering the actual vehicle road load, emulation engine, power split dedicated hybrid transmission, and bench driveline system. Secondly, the dynamic response of power source and the loading characteristics of bench system model are compared and analyzed for the mode transition process from pure electric to power split hybrid. Then, a speed feedforward correction compensator based on speed closed-loop tracking is designed to improve the anti-interference ability of the load emulation speed control, and combined with the torque feedforward correction compensator to reduce the dynamic error of the load torque. Finally, the off-line simulation and hardware-in-the-loop tests are carried out. The results show that the load dynamic compensation algorithm based on the bench system model can improve the load accuracy by more than 32.67%, which ensures the precision of the power split hybrid system mode transition performance test.

Key words: test bench model, power split hybrid system, mode transition, load compensation