功率分流混合动力系统模式切换连续瞬态冲击机理及其性能客观评价

doi:10.19562/j.chinasae.qcgc.2024.04.013

Abstract

Abstract:

For the problem that the continuous transient impact mechanism in mode transition process for power split hybrid power system is not clear and there is no objective evaluation index and method， the mechanism of continuous transient impact in mode transition and the objective evaluation method of its performance are explored in this paper. Firstly， a transient torsional vibration model of dedicated hybrid transmission （DHT） is established with consideration of torque crossing zero， time-varying stiffness of gear pair meshing， backlash and torque ripple of drive motor based on the high dynamic performance test bench of the power transmission system. Secondly， the mechanism of torque crossing zero change during DHT mode transition is studied， and a time-domain evaluation index of continuous transient impact performance is proposed considering the number of torque crossing zero and mode transition time， and a frequency-domain evaluation index based on time-frequency characteristics of impact degree is established by short-time Fourier transform method. Finally， taking the transition process of pure electric to power split hybrid mode as an example， the coefficient of variation method is used to objectively analyze and evaluate the continuous transient impact performance under the influence of different accelerator pedal opening and backlash. The results show that the frequent torque crossing zero at the power output end of the power split DHT and the coupling between the backlash are the main causes of the continuous transient impact during the mode transition process. Decreasing the backlash can reduce the continuous transient impact in the maximum amplitude frequency range of 100 ~ 200 Hz. Moreover， according to the comparison of comprehensive evaluation scores， the optimization parameters of continuous transient impact performance during mode transition are obtained. The study can provide support for the optimization of coordinated control strategy for mode transition smoothness of power split hybrid power system.

Key words: power split, hybrid power system, mode transition, continuous transient impact, objective evaluation

Haodi Li,Zhiguo Zhao,Peng Tang,Yongping Hou. Continuous Transient Impact Mechanism and Objective Evaluation in Mode Transition for Power Split Hybrid Power System[J].Automotive Engineering, 2024, 46(4): 669-681.

Figures/Tables 17

References 23

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Continuous Transient Impact Mechanism and Objective Evaluation in Mode Transition for Power Split Hybrid Power System

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