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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Multibody dynamics analysis for the coupled vibrations of a power split hybrid electric vehicle during the engine start transition
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Multibody dynamics analysis for the coupled vibrations of a power split hybrid electric vehicle during the engine start transition

机译：动力分配混合动力汽车发动机启动过渡过程中耦合振动的多体动力学分析

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摘要

Minimizing working time of the internal combustion engine is an important method for hybrid electric vehicles to save energy and reduce emissions. However, vibrations caused by frequent engine starts and stops deteriorate driveability and ride comfort. Especially in power split hybrid vehicles, there is no kinematically decoupled device between the engine and transmission, so that vibrations transfer from the powertrain to the car body through not only engine mounts but also the driveline system. Hardware test results show that the longitudinal vibration of seat track is the most severe with a maximum peak-to-peak acceleration of 1.8m/s(2). In this study, dynamic models of the driveline system and the powertrain mounting system are respectively established in detail. The natural characteristic analyses of the two dynamic models reveal that engine order vibrations can stimulate a series of low-frequency resonances during the engine starts, which is finally embodied in the car body vibrations. Then, two dynamic models are coupled together to analyze the transient dynamic characteristics associated with engine starts. It is evident by simulations that the longitudinal vibration of car body is mainly transferred by the driveline, whereas the vertical vibration of car body is mainly transferred by the powertrain mounting system. Besides, the initial crankshaft position of the gasoline engine has an obvious effect on the engine order vibration, and further results in different transient responses of the full vehicle system.
机译：最小化内燃机的工作时间是混合动力电动汽车节省能源和减少排放的重要方法。但是，发动机频繁启停引起的振动会降低驾驶性能和乘坐舒适性。尤其是在动力分配混合动力汽车中，发动机和变速箱之间没有运动学上分离的装置，因此，振动不仅通过发动机支架而且通过传动系统从动力总成传递到车身。硬件测试结果表明，座椅轨道的纵向振动最严重，最大峰峰值加速度为1.8m / s（2）。在这项研究中，分别详细建立了动力传动系统和动力总成安装系统的动力学模型。对两个动力学模型的自然特性分析表明，发动机启动期间的发动机振动会激发一系列低频共振，最终体现在车身振动中。然后，将两个动力学模型耦合在一起以分析与发动机启动相关的瞬态动力学特性。通过仿真可以看出，车身的纵向振动主要通过传动系统传递，而车身的垂直振动主要通过动力总成安装系统传递。此外，汽油发动机的初始曲轴位置对发动机的阶跃振动有明显的影响，并进一步导致整个车辆系统的瞬态响应不同。

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