Aiming at the problems of slow clamping force response and deteriorating control accuracy caused by uncertainty factors such as internal system variable coupling, parameter perturbation, and external time-varying interference in electronic mechanical brake, an improved sliding mode control method for clamping force of electronic mechanical brake based on super-twisting extended state observer is proposed in this paper. Firstly, an improved reaching law is designed, which introduces a variable function gain term and a sliding mode surface power term on the basis of the traditional exponential reaching law. This increases the convergence speed while weakening chattering phenomenon. Based on the improved reaching law and sliding mode surface, an improved clamping force controller is designed. Secondly, design an extended state observer based on the super-twisting algorithm to estimate system disturbances, while feedforward the estimated disturbance values to the controller for compensation. Thirdly, the stability of the system is proven through the Lyapunov theorem. Finally, compare the algorithm proposed in this paper with algorithms such as double power reaching law, fast power reaching law and exponential reaching law in the test bench experiments. The results show that the clamping force control of the electronic mechanical brake under the algorithm proposed in this paper has higher response speed, control accuracy, and anti-interference ability.
在复杂工况下,EMB系统内部变量耦合、参数摄动、外部时变干扰等会导致控制性能恶化,因此控制方法的抗干扰能力是其能否实际应用的关键。文献[18]将电机编码器与电流传感器组合起来以估计夹紧力,同时利用遗传算法优化系统噪声,使滤波效果得到一定的提升。实验结果表明,优化后的卡尔曼滤波器能够更好地抵抗干扰,更有效地实现夹紧力的准确控制,使系统可靠性有所提升。文献[19]设计了基于算法的鲁棒控制器,提高了系统的抗扰性及鲁棒性,但其控制较为保守,难以兼顾良好的动、静态性能。文献[20]设计了基于扰动观测器的快速终端滑模制动力矩控制方法,可观测和补偿系统扰动,同时削弱了系统抖振现象。文献[21]设计了强耦合条件下无压力传感器的EMB夹紧力控制算法,并设计了基于sigmoid函数的改进型扩张状态观测器(Extended state observer, ESO),对系统扰动进行估计与补偿,使系统的鲁棒性有所提高。
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