典型工况与工作模式下混联式混合传动系统振动分析

针对发动机、电动机和行星齿轮系等子系统组成的混联式混合动力驱传动系统,考虑动力控制策略以及典型运行工况,建立了混合动力驱传动系统扭转动力学模型,分析了纯电动、混合动力和停车充电工作模式下系统的固有特性和瞬态响应.研究发现,3个模式下系统的重根频率相同且只与行星齿轮系统的转动惯量和啮合刚度等参数有关,纯电动和停车充电模式下系统的非重根频率和振型均相近;整车加速度瞬态响应与激励源干扰力矩的频率成分相同,在启动电机工作阶段和停机阶段低转速运行时,转矩波动引起的整车纵向振动较大.模式切换造成激励源转矩突变,行星齿轮系统的角加速度波动幅值明显增大.

Vibration Analysis of Series Parallel Hybrid Powertrain System Considering Typical Operating Condition and Modes

Aiming at a series parallel hybrid powertrain system which contains engine, motor and planetary gear subsystems, this paper considered a typical working condition which is based on the power control strategy and established the torsional vibration mechanical model of a hybrid powertrain system. The inherent characteristics and transient vibration response of the electric mode, hybrid mode and parking charging mode were studied. It was discovered that the repetitive frequency of the powertrain system in the three working modes is the same which is only related to the inertia and meshing stiffness of the planetary gear system. The non repetitive frequency and corresponding vibration modes in the electric mode and parking charging mode are almost identical. The transient response of body acceleration has the same frequency component as the interference torque of the excitation sources, the body vibration caused by torque ripple become obvious when the starter drives the engine and stays in the regenerative braking mode at low engine speed. The angular acceleration of the planetary gear system significantly increases due to the torque fluctuations caused by the working mode switches.