The power-split hybrid electric vehicle has multiple working modes, which can be switched to different working mode according to different working conditions. The main switching process involved in the vehicle driving is the switch from the pure electric mode to the hybrid driving mode. This paper studies the mode switching process involved in the power-split hybrid electric vehicle driving process, and a nonlinear dynamic equation of the electromechanical coupling of the corresponding transmission system is established. Then the multi-scale method is employed to solve the dynamic equation, and the amplitude-frequency response curve is drawn. According to the curve, the effects of load, mechanical input excitation of the engine and motor electromagnetic excitation on the electromechanical coupling torsional vibration of the transmission system are studied. The engine and motor torque distribution schemes are obtained by analyzing the amplitude-frequency response curve of the torsional vibration characteristics of the system. The analysis results show that the vibration instability phenomenon of the transmission system can be avoided by establishing the nonlinear dynamic equation of the transmission system, analyzing the vibration characteristics of the vibration system, and optimizing the torque distribution of a PS-HEV at different working modes.

中文翻译：

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基于PS-HEV传动系统振动不稳定性的扭矩分配方法

动力分流混合动力汽车具有多种工作模式，可根据不同的工况切换到不同的工作模式。车辆行驶的主要切换过程是从纯电动模式到混合动力模式的切换。本文研究了动力分流混合动力汽车驱动过程中涉及的模式切换过程，建立了相应传动系统机电耦合的非线性动力学方程。然后采用多尺度方法求解动力学方程，绘制幅频响应曲线。根据曲线，载荷的影响，研究了发动机的机械输入激励和电机电磁激励对传动系统机电耦合扭振的影响。通过分析系统扭振特性的幅频响应曲线，得到发动机和电机扭矩分配方案。分析结果表明，通过建立传动系统非线性动力学方程，分析振动系统的振动特性，优化PS-HEV不同工况下的扭矩分配，可以避免传动系统的振动失稳现象。 .