基于滑模迭代学习的发动机怠速扭振模拟技术

为了解决永磁同步电机在室内传动系试验台架上模拟发动机扭振高动态响应特性的问题,首先建立了由平均扭矩、往复惯量引起的激振和燃烧压力引起的激振信号构成的发动机实时扭振模型,具有数学计算量小、动行速度快的特点,能满足高动态控制响应的要求;然后,设计了一种滑模变结构控制(sliding mode control,简称SM)和迭代学习控制(iterative learing control,简称ILC)相结合的控制器,利用变结构控制对系统参数和外部干扰具有不变性及迭代学习不依赖于系统精确数学模型的优势,提高了控制系统的稳定性和动态响应;最后,在室内传动系台架上进行了模拟试验。试验结果验证了发动机模型和控制算法在传动系试验台架上模拟发动机扭振的有效性和可行性。

Engine Torque Pulsation Simulation Under Idling Speed Based on Sliding Mode and Iterative Learning Control

A real-time engine model was presented for engine torque pulsation simulation (ETPS) under idling speed. Traditional engine models in the literature were often computationally intensive and not suited to accurately capture these dynamic characteristics using real-time simulation. Our model can be decomposed into a mean torque, inertia pulse and combustion pulse for real-time simulation. The engine torsional vibration model was established to meet the requirements of the dynamic characteristics of the platform. The sliding mode iterative learning controller was designed to improve system stability and dynamic response. Test results prove the validity and precision of this design approach.