汽车工程 ›› 2024, Vol. 46 ›› Issue (4): 669-681.doi: 10.19562/j.chinasae.qcgc.2024.04.013

• • 上一篇    

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

李豪迪,赵治国(),唐鹏,侯永平   

  1. 同济大学汽车学院,上海 201804
  • 收稿日期:2023-09-30 修回日期:2023-11-13 出版日期:2024-04-25 发布日期:2024-04-24
  • 通讯作者: 赵治国 E-mail:zhiguozhao@tongji.edu.cn
  • 基金资助:
    上海市科委科技创新项目(21DZ1209700);国家自然科学基金(51675381)

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

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

  1. School of Automotive Studies,Tongji University,Shanghai  201804
  • Received:2023-09-30 Revised:2023-11-13 Online:2024-04-25 Published:2024-04-24
  • Contact: Zhiguo Zhao E-mail:zhiguozhao@tongji.edu.cn

摘要:

针对功率分流混合动力系统模式切换过程连续瞬态冲击机理尚不明确且缺乏客观评价指标和方法的问题,本文探究了模式切换连续瞬态冲击机理及其性能客观评价方法。首先,结合动力传动系统高动态性能测试台架,建立了考虑转矩过零、齿轮副啮合时变刚度、齿隙及驱动电机转矩脉动的功率分流混合动力专用变速器(DHT)瞬态扭振模型;其次,研究了DHT模式切换过程转矩过零变化机理,提出了考虑转矩过零次数和模式切换时间的连续瞬态冲击性能时域评价指标,并采用短时傅里叶变换方法建立了基于冲击度时频特性的频域评价指标;最后,以纯电动向功率分流混动模式切换过程为例,采用变异系数法对不同加速踏板开度和齿隙影响下的连续瞬态冲击性能进行了客观分析评价。结果表明,功率分流DHT动力输出端转矩频繁过零和齿隙间的耦合作用是引发模式切换过程连续瞬态冲击的主要原因,减小齿隙可降低最大振幅频率100~200 Hz范围内的连续瞬态冲击;同时,根据综合评价得分对比,得到了模式切换过程连续瞬态冲击性能优化参数,本研究可为功率分流混合动力系统模式切换平顺性协调控制策略优化提供支撑。

关键词: 功率分流, 混合动力系统, 模式切换, 连续瞬态冲击, 客观评价

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