为电动汽车再生制动系统设计了一种兼顾能量回收效率与制动安全性的制动力分配策略。首先根据制动力需求初步分配前、后轴间制动力;再根据运行状态、部件性能等限制因素进行再生制动介入状态及程度判定,最后对驱动轴制动力进行再分配。分别使用MATLAB/Simulink与CRUISE搭建相关仿真模型并进行多工况联合仿真。在联合仿真中使用自行构建的太原市综合行驶工况,检验了分配策略在本地化工况下的运行效果。仿真结果表明所设计的分配策略在通用工况和本地化工况下均有较好的应用效果。

A series-parallel hydraulic hybrid system applied to public buses is put forward,and parameters of key components are analyzed and determined.Energy management strategy based on logic threshold is designed which is aimed at efficient operation of the overall system considering the operational characteristic of the components and taking the curves of engine,hydraulic pump/motor and hydraulic pump as the main design basis;regenerative control strategy which makes regenerative brake system and frictional brake system work harmoniously is designed to raise recovery rate of regenerative brake energy.System dynamic modeling and simulation results show that the energy control strategy designed here is able to adapt system to changes of working condition and switch the operating mode reasonably.The regenerative braking control strategy is effective in raising the utilization of energy and improving fuel economy.

由于环境污染和能源短缺问题备受关注,电动汽车已成为全世界汽车工业领域研究的热点。再生制动引入到传统液压制动系统中会改变原有车辆制动性能,需使再生制动与液压制动之间协调一致,确保车辆制动稳定性及驾驶平顺性,并最大化提高能量回收效率,延长电动汽车的续驶里程,值得业内人士的关注。

针对液压混合动力工程车辆工作过程中存在的燃油经济性较差和能量回收率低的问题以装载机为原型提出了一种基于模糊控制理论的车辆驱动与联合制动能量管理策略。根据车速、蓄能器SOC、泵/马达扭矩、制动扭矩等相关参数建立相应的模糊规则制定车辆驱动控制策略和再生制动控制策略。搭建整车前向仿真模型对制定的控制策略进行仿真然后进行硬件在环实验对仿真结果进行验证。结果表明提出的控制策略合理有效车辆的燃油消耗率有所下降。