PHEV行进间启动发动机的转矩协调控制策略

Torque Coordinated Control Strategy of PHEV Engine Starting in Motion Process

插电式混合动力汽车(PHEV)行进间启动发动机时,因电机和发动机不同的转矩响应特性会引起较大的驱动转矩波动。针对此问题,提出了一种转矩协调控制策略。首先,在LMS.AMESim平台建立了所研究的混合动力汽车动力系统模型;然后,在Matlab/Simulink平台搭建了基于发动机怠速转速点火的“离合器油压模糊控制+电机转矩补偿+发动机调速控制+发动机转矩变化率限制”的转矩协调控制策略模型;最后,利用联合仿真平台进行了行进间启动发动机的模式切换仿真研究,并与不同的控制策略进行对比分析。结果表明:所提出的模式切换控制策略在整车冲击度和离合器滑摩功两方面均有较大改善,提高了模式切换的平顺性。

When the plug-in hybrid electric vehicle(PHEV)starts the engine in motion process,the driving torque fluctuates greatly due to the different torque response characteristics of the motor and the engine.A torque coordinated control strategy was proposed in this paper to solve this problem.First of all,the hybrid electric vehicle power system model was established on the LMS.AMESim platform.Then,a torque coordination control strategy model of“clutch oil pressure fuzzy control+motor torque compensation+engine speed control+engine torque change rate limit”based on engine idling speed ignition was built on the Matlab/Simulink platform.Finally,based on the built co-simulation platform,the mode transition co-simulation was carried out and compared with different control strategies.The results show that the proposed mode switching control strategy can greatly improve the vehicle impact and clutch friction work,and improve the smoothness of mode transitions.