基于瞬时优化的HEV控制策略

以一种充电保持型并联式混合动力电动汽车（hybrid electrical vehicle，HEV）为具体对象，研究以瞬时等效燃油经济性和排放性能为综合优化目标的控制策略。该策略以传动系统的能量转换效率和排放“效率”作为评价燃油经济性和排放的指标来建立优化目标方程，通过基于HEV整车及动力总成相关数学模型所建立的Matlab／Simulink仿真优化平台，搜寻出全部转速一转矩需求条件下动力总成各元件的理想能量分配及相应档位，并以MAP图的形式存储于车载监控器中。监控器根据HEV荷电保持的设计要求，按瞬时工况调用这些MAP图，以简单查表计算方式对理想值实时地作适当修正和调整。所述监控策略的有效性、实时性通过若干典型行驶工况仿真及实车应用得以证实，展现出良好的实用价值。

HEV Control Strategy Based on Instantaneous Optimization

This paper adopts an instantaneous optimization control strategy for a chargesustaining,parallel hybrid electrical vehicle (HEV) with the instantaneous fuel economy and emission as objective function,and this strategy sets the vehicle overall power conversion efficiency and engine emission "efficiency" as the guideline of fuel consumption and emission.Based on the math models related to the entire vehicle and its powertrain,a Matlab/Simulink simulation platform is built up to search the ideal operating point of the vehicle's engine and motor by the objective function optimization under HEV's possible speed-torque sets and the corresponding gearshifts,which are then stored in the HEV's onboard supervisory controller.Data are looked up from the maps by the controller based on the instantaneous driving condition,and are simply but properly modified according to the preset charge-sustaining requirement.Validity and real-time responsibility of this control strategy are proved by simulations with several typical driving cycles and other kind of vehicle simulation software,revealing good practicability of the strategy.