传感器或执行机构的失效会造成控制系统的严重恶化,本文针对造纸工业过程网前箱控制系统传感器失效问题,提出了一种基于模型的故障诊断和容错控制方法,该方法利用状态观测器阵列实现了对任一传感器故障的及时诊断和隔离,并重新构造状态估计器和控制器,从而保证闭环系统在故障发生后仍能稳定且有很好的控制性能,仿真结果证实了此种方法的有效性. The failure of sensor or actuator will cause serious deterioration of control system. In this paper, a failure diagnosis and fault-tolerant control method based on model is proposed for sensor failure of front control system in paper industry process. This method uses state observer array The timely diagnosis and isolation of any sensor failure and reconfiguration of the state estimator and controller to ensure that the closed-loop system is stable and has good control performance after the fault occurs, the simulation results confirm the effectiveness of this method Sex.