双行星排式混合动力汽车的模式切换协调控制

Coordinated Control for the Mode Switching of Hybrid Electric Vehicles with Double Planetary Gears

以一款基于双行星排式动力耦合机构的混合动力汽车为研究对象,针对其模式切换过程中因发动机和电机的动态响应时间悬殊较大而引起的驱动转矩波动太大和整车冲击大等不良现象,提出了"转矩分配+发动机转矩监测+电动机转矩补偿"的动态协调控制策略,并在Matlab/Simulink平台中搭建了控制策略模型,联合LMS. AMESim平台中建立的整车模型进行了联合仿真,以纯电动模式向联合驱动模式切换过程为例进行了模式切换瞬间的舒适性分析。结果表明,动态协调控制策略能有效减小模式切换过程中的驱动转矩波动和整车冲击度,提高了车辆的行驶平顺性,同时冲击度的幅频特性表明,该混合动力汽车模式切换瞬间的整车冲击能量主要集中在1～2 Hz,所提出的满意度评价指标在经过动态协调控制后获得较大提升。

Taking a hybird elecetric vehicle with the double planetary gear power coupling mechanism as the research object,aiming at solving the problems such as driving torque fluctuations and the great shock generated due to the different response time of the engine and the motor during mode switching,a coordinated control algorithm of the“torque distribution,engine torque monitoring and motor torque compensation”was proposed. The control strategy model built in Matlab/Simulink and the vehicle model established in LMS.AMESim were jointly simulated. The comfort analysis was conducted when the pure electric driving mode was switched to the joint driving mode. The results show that the proposed strategy can effectively reduce the driving torque fluctuations and the shock generated during the mode switching process,and therefore improve the ride comfort. The amplitude-frequency characteristics of the shock indicate that the vehicle shock energy at the moment of mode switching is mainly concentrated in 1 - 2 Hz. The proposed satisfaction evaluation index has been greatly improved after the dynamic coordinated control.