An observer-based fault-tolerant control method is proposed for a linear system with sensor saturation constraint. Considering the linear system with simultaneous actuator faults and sensor faults, the sensor saturation would bring the output measurement error of the system, which would result in the estimation performance degradation. Firstly, the intermediate estimator is modified to estimate the system states and fault signals at the simultaneous time, and the fault-tolerant controller is designed based on the estimation to compensate the effect of actuator faults effectively. Through Lyapunov stability analysis, the sufficient conditions are obtained to ensure the states of closed-loop system to be uniformly ultimately bounded. The effect of sensor saturation error can be suppressed by adjusting some specified parameters directly without introducing any performance index. Finally, the effectiveness and superiority of the proposed method are verified by a simulation example.

中文翻译：

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传感器饱和约束下线性系统的容错控制

针对具有传感器饱和约束的线性系统，提出了一种基于观测器的容错控制方法。考虑到同时存在执行器故障和传感器故障的线性系统，传感器饱和会带来系统的输出测量误差，从而导致估计性能下降。首先修改中间估计器，同时估计系统状态和故障信号，并在此基础上设计容错控制器，有效补偿执行器故障的影响。通过李雅普诺夫稳定性分析，得到了保证闭环系统状态一致最终有界的充分条件。在不引入任何性能指标的情况下，可以通过直接调整一些指定参数来抑制传感器饱和误差的影响。最后通过仿真算例验证了所提方法的有效性和优越性。