车辆传动系道路负载模拟系统

摘要

为了考核汽车传动系疲劳耐久性，利用汽车传动系道路模拟试验系统在室内重现车辆在真实道路上的行驶扭矩载荷谱。对载荷谱数据进行频谱分析，确定负载模拟系统载荷谱频带宽度。为了提高负载模拟控制系统对目标载荷曲线的跟随精度，设计了一种滑模变结构技术和迭代学习控制技术相结合的控制器，迭代学习控制通过重复执行同一任务来减少跟随误差，使系统输出尽可能逼近理想值，结合滑模变结构控制响应快，对参数变化及扰动不敏感的优点提高了模拟系统的鲁棒性。滑模迭代学习控制方法在学习10次后其控制精度（4．7％）比使用常规 PID 控制（8．3％）提高了3．6％，迭代后载荷响应误差可控制在5％以内，能够满足室内耐久性试验的要求。%In order to study the fatigue durability of a vehicle drivetrain system,a new vehicle drivetrain road load simulation system was designed to return the load spectrum on an indoor testbench.The band widths of the load simulation system were obtained according to the measured data.Based on the iterative learning control (ILC),a sliding mode variable structure control(SMC)scheme was proposed for the road load simulation system to improve the accuracy of load spectrum tracking.ILC generally improved the system performance in performing repetitive tasks by using the information from previous iterations,SMC with advantages of fast response and being not sensitive to disturbances of parameters was a good solution to the problem of the system's robustness.It was shown that compared with the conventional PID control,the control precision of the simulation system with ILC and SMC can be improved by 3.6%,the iteratived load response error can be controlled within 5%,the requirements of the indoor durability test can be met.