基于虚拟仿真开发平台的PHEV动态协调控制研究

Dynamic Coordinate Control Research for PHEV Based on VirtualSimulation Development Platform

针对一种双轴耦合四轮驱动插电式混合动力汽车,笔者利用虚拟仿真开发平台对其控制策略与整车性能进行研究。介绍了虚拟仿真开发平台的组成和功能,通过仿真数据与实车试验的对比分析与验证,保证了平台建模分析的有效性与准确性。利用能量流与杠杆分析法,进行目标系统的动力学特性分析,获得各驾驶模式下的扭矩、速度传递公式;依据目标系统构型,利用平台完成整车动力学系统的建模。开发各驱动模式下核心部件驱动策略及模式切换控制策略,提出一种基于效率最优的动态协调控制算法。研究结果表明:整车驱动策略具有有效性,通过分析双电机动态协调控制前后特性曲线发现,此算法实现了电机的优化控制,实现了4.26%的效率提升。

A virtual simulation development platform(VSDP)was used to investigate the control strategy and vehicle performance of a dual axle coupling based 4-wheel-drive(4WD)plug-in hybrid electric vehicle(PHEV).Firstly,the composition and function of the VSDP were introduced,and the validity and accuracy of platform modeling analysis were ensured through the comparative analysis and verification of simulation data and real vehicle test.Secondly,using power flow and lever analysis method,the dynamic characteristics of the target system were analyzed,and the torque and speed transfer formulas under each driving mode were obtained.Based on the configuration of the target system,the vehicle dynamic system modeling was finished by using the VSDP.The driving strategy and mode switching control strategy of core components under each driving mode were developed and a dynamic coordinated control algorithm based on efficiency optimization was proposed.The research results verify the validity of the proposed vehicle driving strategy.Based on the analysis on the characteristic curves with/without dynamic coordinate control of dual motors,it is discovered that the proposed algorithm achieves the optimal control of the motor,and improves the efficiency by 4.26%.