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为实现混合动力汽车的动力性、燃油经济性以及模式切换平顺性,以基于CVT的插电式混合动力汽车为研究对象,针对混合动力汽车的多目标优化问题,提出一种可变逻辑门限控制策略。整车控制过程中根据功率需求进行模式切换,其中行驶需求功率根据车速和节气门开度计算得到,切换门限根据整车参数实时计算。以发动机和电机的输出特性、电池的SOC为主要依据计算工作模式切换的可变逻辑门限值。通过电机助力保证整车具有较好的动力性能,通过不同模式下驱动功率的一致性实现模式切换平顺,通过小功率需求时仅可能多用纯电动来提高燃油经济性。在MATLAB/Simulink平台下建立混合动力汽车前向仿真模型,并在NEDC工况下进行仿真。仿真结果表明:整车动力性能得到了提高,实现了模式切换平顺性,节油40%。
In order to realize the power, fuel economy and smoothness of mode switching of hybrid electric vehicle, the plug-in hybrid electric vehicle based on CVT is taken as the research object. For the multi-objective optimization problem of hybrid electric vehicle, a variable logic threshold control Strategy. Vehicle control process according to the power demand for mode switching, in which driving demand power calculated according to the speed and throttle opening, switching threshold calculated in real time according to vehicle parameters. Based on the output characteristics of the engine and the motor, the SOC of the battery is mainly used to calculate the variable logic threshold for switching the operating mode. Through the help of the motor to ensure that the vehicle has good dynamic performance, the mode switching is smooth through the consistency of the driving power under different modes, and only the pure electric power can be used to improve the fuel economy through the demand of low power. In the MATLAB / Simulink platform to establish a hybrid vehicle forward simulation model, and in the NEDC conditions simulation. The simulation results show that the vehicle dynamic performance has been improved and the mode switching smoothness has been achieved, saving 40%.