ABSTRACT This paper proposes two fault-tolerant sensor reconciliation design methods for over-sensed plants. The aim of the reconciliator is to detect the presence of faults on the existing physical sensors and hide the corrupted measurements in the generation of a virtual output, which one would like to be generated in a reliable way in spite of fault occurrences and hence trustfully usable for control purposes. The sensor faults here considered are limited to variations of both sensor gain and offset values. The proposed approach envisages the use of an unknown input observers coupled with an ‘ad-hoc’ parameters estimator used to estimate online the sensor effectiveness matrix at each time instant. In the paper, two design methodologies are described, based one on the linear parameter varying polytopic formulation and the other on the linear fractional transformation paradigm. All main properties of the considered schemes are investigated and rigorously proved.

中文翻译：

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基于未知输入观察者的容错传感器协调方案

摘要 本文提出了两种针对过度感知植物的容错传感器协调设计方法。协调器的目的是检测现有物理传感器上是否存在故障，并在生成虚拟输出时隐藏损坏的测量值，尽管发生故障，但仍希望以可靠的方式生成该输出，因此可信赖地使用用于控制目的。这里考虑的传感器故障仅限于传感器增益和偏移值的变化。所提出的方法设想使用一个未知的输入观察器和一个“ad-hoc”参数估计器，用于在每个时刻在线估计传感器有效性矩阵。在论文中，描述了两种设计方法，一种基于线性参数变化的多面体公式，另一种基于线性分数变换范式。研究并严格证明了所考虑方案的所有主要属性。