台架负载模拟控制方法研究

动态载荷负载模拟是室内台架测试的核心技术之一，也是评估试验台架综合性能重要途径。针对某一混动式汽车台架，以型号为C8051F120单片机所能达到的转速脉冲信号的测频精度为基础开展动态加载技术研究。在Matlab/Simulink中建立整车传动系动力学模型和台架系统模型；设计逆向模型控制的负载模拟方案和PI自适应卡尔曼滤波算法，并搭建相应的控制器模型来分析不同采样频率和测频精度对负载模拟的影响。仿真结果表明：低速段在采样频率100 Hz、测频精度0.001%未滤波下，电机最大加载扭矩误差为10%;高速段在采样频率100 Hz、测频精度0.001%滤波下，系统响应时间0.11 s,电机加载扭矩误差15%;加载系统能够平稳运行且可以达到动态加载目的，验证负载模拟算法的正确性。在得到正确的仿真结果后可轻松实现代码生成，从而为台架硬件在环试验提供参考。

Research on load simulation control method of bench

Dynamic load simulation is one of the core technologies of indoor bench testing, and it is also an important way to evaluate the comprehensive performance of the test bench. Aiming at a hybrid vehicle bench, the dynamic loading technology research was carried out based on the frequency measurement accuracy of the speed pulse signal that the model C8051F120 could achieve. The dynamic model of the vehicle drive train and the bench system model was established in Matlab/Simulink, the load simulation algorithm and the PI adaptive Kalman filter algorithm controlled by the inverse model were designed, and the corresponding controllers were built to analyze the different sampling frequency and frequency measurement accuracy impact of load simulation. The simulation showed that the maximum load dynamic torque error of the motor was 10% when the low speed section was at a sampling frequency of 100 Hz, and the frequency measurement accuracy was 0.001% without filtering. The high speed section was filtered at a sampling frequency of 100 Hz, the frequency measurement accuracy was 0.001%, the system response time was 0.11 s, and the motor loading torque error was 15%. The loading system could run smoothly and could achieve the purpose of dynamic loading, which verified the correctness of the load simulation algorithm. After getting the correct simulation results, code generation could be easily achieved, which provided a reference for the hardware in the loop test of the bench.