Abstract For plug-in hybrid electric vehicles (PHEVs), mode transition might be the most effective way of energy conservation. However, the transient torsional vibration (TTV) during mode transition process, which is unavoidable, usually affect the drive comfort. This paper presents an innovative planetary hybrid power-split system (PHPS), which comprised of an epicyclic gear system, two compact clutches and a wedge brake device, and will been applied Chery PHEVs. First, powertrain vibration during mode transition process, as influenced by dynamic transfer friction torque of clutch, angle-varying mesh stiffness of epicyclic gear and external loads of multi-power sources, are investigated through a nonlinear TTV model. Then, the dynamic equations of mode transition process are established and numerically solved to get TTV response as well as vehicle jerk, and further new clutch oil-pressure establishing method design of PHEVs during mode transition process for relative torsional oscillation suppression of PHPS is presented. At last, bench tests are carried out, and results indicated that the proposed optimization model effectively suppressed PHPS torsional oscillation, vehicle longitudinal jerk, and improved driving smoothness during mode transition process.

中文翻译：

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行星动力分流系统瞬态扭振抑制模式转换过程中PHEV离合器油压建立新方法设计

摘要 对于插电式混合动力汽车（PHEV），模式转换可能是最有效的节能方式。然而，模式转换过程中不可避免的瞬态扭转振动（TTV）通常会影响驾驶舒适性。本文介绍了一种创新的行星混合动力分流系统（PHPS），它由一个行星齿轮系统、两个紧凑型离合器和一个楔形制动装置组成，并将应用于奇瑞 PHEV。首先，通过非线性TTV模型研究了动力系统在模式转换过程中的振动，其受离合器的动态传递摩擦力矩、行星齿轮的变角啮合刚度和多动力源的外部载荷的影响。然后，建立了模式转换过程的动力学方程并进行了数值求解，得到了TTV响应和车辆加加速度，并进一步提出了PHEVs模式转换过程中离合器油压建立方法设计，以抑制PHPS的相对扭转振荡。最后进行台架试验，结果表明，所提出的优化模型有效抑制了PHPS扭转振荡、车辆纵向冲击，提高了模式转换过程中的行驶平顺性。