串并联式机电耦合系统方案设计及寻优分析

Design and Optimization of Series-Parallel Electromechanical Coupling System

针对串并联混合动力系统,构建考虑动力性、经济性与成本的三维度方案评价体系,建立基于动态规划算法的寻优模型,评估不同挡位、速比及电机参数的串并联混合动力方案的经济性,同时针对动态寻优仿真时间长、模式切换次数多、发动机起停频繁、工作点离散的问题,建立模式切换惩罚矩阵,缩短了寻优时间并提高了计算效率。最终,针对某目标车型与发动机万有特性,获得了最优挡位数、速比值及电机参数。

A 3-dimensional plan evaluation system is constructed considering power,economy and cost for seriesparallel hybrid system,an optimization model is established based on dynamic planning algorithm,the economy of seriesparallel hybrid plan with different speeds,speed ratios and motor parameters is evaluated.A mode-switch penalty matrix is established to shorten optimization time,and increase calculation efficiency for the shortcomings of long duration of dynamic optimization&simulation,more mode-switch times,frequent engine stop-start operations and dispersed operating points.Ultimately the optimal speed,speed ratio and motor parameters are obtained for a target model and engine performance map.