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首先对控制系统的各种故障形式予以分析，给出故障系统的数学模型；然后，提出能控（能观）意义上的功能冗余、系统的能控（能观）冗余度及某个部件对系统的能控（能观）重要度等概念，并对系统的可容错性予以量化分析，从而为控制系统的可靠性设计提供了依据；最后用造纸过程控制系统中的两个实例说明之．
First of all, it analyzes the various failure modes of the control system and gives the mathematical model of the fault system. Then, it proposes the function redundancy, the controllable (observable) redundancy of the system and some Components on the system of energy control (concept) importance and other concepts, and the system can be quantitatively analyzed for fault tolerance, which provides the basis for the reliability of the control system design; the last paper with two examples of process control system It