余度技术是提高飞行自动控制系统可靠性的有效手段。本文通过对一种三余度控制系统的仿真研究,评述了信号选择器、比较器与主备式余度舵机的性能要求,分析了它们在故障的瞬态、故障监控的覆盖与减少误切除等方面的效果。 Margin technology is an effective way to improve the reliability of flight automatic control system. In this paper, the performance requirements of signal selector, comparator and master / slave redundancy servo are reviewed through the simulation study of a three-redundant control system. The analysis of their coverage in the transient, fault monitoring and reduction Excision and other aspects of the effect.