双电机混合动力车辆串并联驱动模式切换控制方法

Control method of switching between series and parallel drive modes of dual-motor hybrid electric vehicle

为实现双电机混联构型混合动力车辆(HEV)的串并联切换控制,通过对双电机混联构型进行串并联驱动模式分析,提出一种通过三动力源协调控制的无动力中断切换方法。将串联到并联切换过程分为发动机工作点转移、离合器结合、动力源切换3个阶段,将并联到串联行驶切换过程划分为动力源切换、离合器打开、发动机工作点转移3个阶段,并通过仿真分析和实车测试对控制方法进行了验证。结果表明:在时速80 km/h进行串联到并联切换时,切换过程历时1.76 s,切换冲击度小于10 m/s^(3),相同时速进行并联到串联切换时,切换过程历时2.57 s,切换冲击度小于5 m/s^(3),整个切换过程,均没有出现动力中断现象。因此,本控制方法,能够顺利地完成串并联切换控制。

A non-power interrupt switching method was proposed based on a coordinated control of three power sources with analyzing of series and parallel driving modes for a dual-motor hybrid electric vehicle(HEV)to realize a series-parallel switching control of the dual-motor HEV.The series-to-parallel switching process includes three stages:engine operating point transferring,clutch coupling,and power source switching.The parallel-to-series switching process includes three stages:power source switching,clutch opening,and engine operating point transferring.The results show that the vehicle tests at a speed of 80 km/h verify the control method,the series-to-parallel switching process lasts 1.76 s,the switching impact is less than 10 m/s3.and the parallel-to-series switching process lasts 2.57 s,the switching impact is less than 5 m/s3,and there is no power interruption during the whole switching process.Therefore,the series-parallel switching control method can be successfully implementedy.