ISG型混合动力系统轴系动力学性能分析

为了探讨ISG型混合动力系统轴系的动力学性能,建立了包括机电耦合轴、滑动轴承和发动机缸体在内的混合动力系统轴系数学模型,依此模型对混合动力系统动力学性能进行分析,计算了机电耦合轴扭振频率和曲拐应力分布,同时计算了一个工作周期内不同混合动力工况下滑动轴承的偏心率和油膜压力.通过对计算结果的分析表明:机电耦合轴的混合动力改造不会在发动机工作转速内出现扭振共振;混合动力改造后的机电耦合轴强度不满足要求,需要优化设计和重新校核;混合动力工况不会明显影响混合动力系统轴承的偏心率和油膜压力;根据机电耦合轴电机端轴承的油膜压力和偏心率可以优化电机轴承以及电机的选型和设计.     

System modeling and dynamic analysis of ISG hybrid power shafting

A system model is established to analyze the dynamic performance of an integrated starter and generator (ISG) hybrid power shafting. The model couples the electromechanical coupling shaft dynamics, the bearing hydrodynamic lubrication and the engine block stiffness. The model is compared with the model based on ADAMS or the model neglecting the bearing hydrodynamics. The bearing eccentricity and the oil film pressure have been calculated under different hybrid conditions or at the different motor power levels. It’s found that the bearing hydrodynamics decreases the calculation results of the bearing peak load. Changes of the hybrid conditions or the motor power have no significant effect on the main bearing, but have impact on the motor bearing. A hybrid power system composed of a 1.6L engine and a 45kW ISG motor can operate safely.