并联混合动力城市客车AMT换挡控制策略

AMT gear shift control strategy for parallel hybrid electric urban buses

摘要:

为了实现混合动力城市客车快速换挡,减少动力中断时间,基于质量-弹簧-阻尼模型对并联混合动力传动系统进行动力学建模．提出利用线性二次高斯和回路传输恢复(LQG/LTR)方法设计摘挡控制器,对摘挡阶段转速振荡进行主动抑制;设计基于模型预测控制(MPC)理论的电机转矩调节器以最小化主动同步时发动机转矩脉动,实现快速同步,并适应混合动力多运行模式带来的离合器状态的不确定性．对上述混合动力AMT换挡过程控制策略分别进行仿真和实车平台验证,试验结果表明:该策略能够将换挡时间控制在1 s内,且冲击度处于合理范围内．应用上述换挡控制策略有助于提高城市客车的舒适性,推进混合动力城市客车AMT系统的产业化．

Abstract:

To reduce the time of torque gap during gear shift and realize the quick gear shift for hybrid electric urban bus, based on the mass-spring-damping model, the kinematics models of parallel hybrid transmission system are established. To damp driveline oscillation when picking gear neutral, a controller is designed by LQG/LTR theory. And to minimize engine torque pulsation and satisfy the uncertainty of clutch states in variety of hybrid operate mode, an electric machine torque regulator is also designed based on MPC realizing quick synchronization. The above hybrid AMT gear shift control strategies are verified by simulation and road test, and the results show that the gear shift time is limited to 1 second and the jerk is also kept within a reasonable range. The comfort of urban bus is enhanced and the industrialization process of hybrid electric urban bus AMT system is promoted by applying the above gear shift control strategy.