搭载机电控制CVT电动汽车再生制动变速策略

摘要

基于对机电控制无级变速器工作原理的分析，提出电动汽车搭载机电控制无级变速器的结构方案，并相应地建立了电机数值模型、电池充电数学模型和机电控制无级变速器速比控制模型。综合考虑电机效率、机电控制无级变速器效率、电池荷电状态和整车特性，提出了再生制动时机电控制无级变速器的变速策略。在MAT-LAB/Simulink仿真平台上，搭建了系统再生制动性能仿真模型，并对搭载机电控制无级变速器的电动汽车再生制动性能进行了仿真。结果表明，采用所提出的变速策略与传统两挡变速策略相比，能更好地发挥电动汽车性能，提高再生制动过程中的能量回收率。通过台架试验，验证了仿真结果的有效性。%A configuration of electric vehicle equipped with electro-mechanical continuously variable trans-mission ( EMCVT) is put forward based on the analysis on the working principle of EMCVT, and the corresponding motor model, battery charging model and the speed ratio control model for EMCVT are established. With considera-tions of motor efficiency, EMCVT efficiency, battery SOC and vehicle characteristics, the shift strategy for EMCVT in regenerative braking is proposed. A simulation model is then built and a simulation on the regenerative braking performance of electric vehicle equipped with EMCVT is conducted with MATLAB/Simulink platform and its results are verified by bench tests. It is shown that compared with traditional two gear shift strategy, the shift strategy pro-posed can better give full play to the performance of electric vehicle and increase the energy recovery rate in regener-ative braking.