Instability mechanism and control of hybrid electric vehicle in initial hybrid driving mode,International Journal of Energy Research

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Instability mechanism and control of hybrid electric vehicle in initial hybrid driving mode
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-11-11 , DOI: 10.1002/er.6199
Donghai Hu _{1,

2} , Ren He ₁ , Jing Wang ₁ , Leli Hu ₁ , Chengkun He ₂

Affiliation

Mode transition is capable of improving the economy of hybrid electric vehicles but may also cause potential crises. When the hybrid power system (hybrid powertrain—HPT) has just completed the mode conversion, the driving system parameters change more dramatically, and the engine torque is fully transferred to the driving motor. Owing to the electromechanical coupling characteristics, HPT may be severely impacted during the operation, causing the instability of initial hybrid drive mode. To solve this problem, the mathematical model of the initial hybrid drive model for a series‐parallel hybrid electric vehicle (SPHEV) is constructed. The local stability condition and bifurcation condition were derived to analyse the influence of engine throttle opening, and the instability threshold of the HPT was given. Moreover, an instability control methodology was designed to optimise the operating region of HPT for the initial hybrid drive mode, and vehicle tests of mode transition were carried out based on the existing SPHEV platform. Studies indicate that different throttle opening may lead to changes in bifurcation characteristics, causing the system to exhibit nonlinear behaviour and random oscillations. In addition, the control methodology proposed in this study can improve the stable operating region by 37% and restrain the oscillations of HPT.

中文翻译：

混合动力汽车初始混合动力模式下的失稳机理与控制

模式转换能够改善混合动力电动汽车的经济性，但也可能引起潜在危机。当混合动力系统（混合动力系统-HPT）刚刚完成模式转换时，驱动系统参数会发生更大的变化，并且发动机扭矩会完全传递给驱动电动机。由于机电耦合特性，HPT在操作过程中可能会受到严重影响，从而导致初始混合动力驱动模式不稳定。为解决此问题，构建了串并联混合动力电动汽车（SPHEV）的初始混合动力驱动模型的数学模型。推导了局部稳定条件和分叉条件，以分析发动机节气门开度的影响，并给出了HPT的不稳定性阈值。而且，设计了一种不稳定控制方法，以针对初始混合动力驾驶模式优化HPT的操作区域，并基于现有SPHEV平台进行了模式转换的车辆测试。研究表明，不同的节气门开度可能会导致分叉特性发生变化，从而导致系统表现出非线性行为和随机振荡。此外，本研究中提出的控制方法可以将稳定工作区域提高37％，并抑制HPT的振荡。导致系统表现出非线性行为和随机振荡。此外，本研究中提出的控制方法可以将稳定工作区域提高37％，并抑制HPT的振荡。导致系统表现出非线性行为和随机振荡。此外，本研究中提出的控制方法可以将稳定工作区域提高37％，并抑制HPT的振荡。

更新日期：2020-11-11

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