基于阿特金森发动机的增程式电动汽车控制策略匹配设计

能量管理控制策略是增程式电动汽车降低油耗和排放的关键,为了使增程式电动汽车获得较好的燃油经济性和控制效果,对采用阿特金森循环发动机的增程式电动汽车的结构特点和工作模式进行了分析.基于阿特金森循环发动机的工作特点,对传统的恒功率控制策略、功率跟随控制策略进行了匹配优化,并提出了发动机三工作点控制策略和基于转速切换的功率跟随控制策略.利用Cruise和Matlab软件建立了联合仿真模型.仿真结果表明:三工作点控制策略与恒功率控制策略相比,有效地防止动力电池大电流充电,有利于缓解电池寿命衰减.基于转速切换的功率跟随控制策略能有效减小发动机转速的频繁波动并且显著提高了燃油经济性,为采用阿特金森循环发动机的增程式电动汽车实用型控制策略的开发提供参考.

Design of control strategy for extended-range electric vehicle based on Atkinson cycle engine

Efficient energy management in hybrid vehicles is the key for reducing fuel consumption and emissions.In order to get better fuel economy and control effect,the structural characteristics and working modes of the extended-range electric vehicle (E-REV) with Atkinson cycle engine are analyzed.Based on the characteristics of Atkinson cycle engine,the conventional thermostat control strategy and power follower control strategy are optimized.The three-point control strategy and the speed switching-power follower control strategy are then proposed.The co-simulation model is developed based on Cruise and Matlab.Compared with the conventional thermostat control strategy,the three-point control strategy can effectively prevent the large current charging of battery and reduce the damage to cycle life of battery.Simulation results show that the proposed speed switching-power follower control strategy can effectively reduce the frequent fluctuation of engine speed and improve the fuel economy.It provides references for the development of practical control strategy for E-REV using the Atkinson cycle engine.