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针对增程式纯电动汽车的结构,为了提高燃油效率保证燃油经济性、限制充放电电流、延长电池使用寿命,提出了一种基于自校正变结构模糊的增程器控制策略。综合考虑电池电量SOC及其变化率、驱动电机功率需求,通过模糊控制调整增程器的输出功率进行能量分配。首先根据SOC值与驱动电机功率需求设计多输入单输出模糊控制器,输出量为增程器的功率;其次根据SOC值将电池状态分为充电模式与放电模式,对不同模式制定不同的模糊控制规则,进行模糊控制器的变结构设计;再次根据SOC值的变化率进行自校正设计,通过限制SOC变化率实现对电池充放电电流的限制,达到对电池的保护功能;最后通过Cruise仿真软件和台架测试对该控制策略进行仿真验证,结果表明燃油经济性以及电池寿命均得到有效提升。
In order to improve the fuel efficiency, ensure the fuel economy, limit the charge and discharge current, and extend the service life of the battery, a control strategy based on self-tuning variable structure fuzzy extender is proposed. Considering the SOC of the battery and its rate of change, the power demand of the driving motor is adjusted, and the energy distribution is adjusted by the fuzzy control to adjust the output power of the extender. First of all, according to the SOC value and the power demand of the drive motor, a multi-input and single-output fuzzy controller is designed. The output is the power of the extender. Secondly, the battery state is divided into charging mode and discharging mode according to SOC value. Different fuzzy control Rules, the fuzzy controller variable structure design; once again according to SOC value of the rate of self-correction design, by limiting SOC rate of change to achieve the battery charge and discharge current limits to achieve the battery protection function; Finally, Cruise simulation software and The bench test verifies this control strategy. The results show that both fuel economy and battery life are effectively improved.