基于三重容错自校验按字表决算法

An Approach of Self-checking Word Voting Based on Triple-Modular-Redundancy

表决逻辑算法决定了容错型控制器是否能准确判断通道的故障信息。针对按位表决算法容错性差的特点,提出了一种按字表决的算法。按字表决算法对系统通道中每一个输出字进行比较,可以解决按位表决算法只能产生异常无法输出结果的问题。在开发三重容错控制器的应用研究中,以按字表决算法为基础,同时在控制器中增加了自动转换环节、自校验监测电路,进一步提高了系统的可靠性。研究结果表明:按字表决算法的可靠性比按位表决算法高,提高了系统的容错性能。

The voting logic algorithm concerns whether the fault-tolerant controller can exactly diagnose the error information of channel. This paper proposes an algorithm of voting logic by word. By comparing the output word of each channel of the system, the algorithm can deal with the problem that the voting algorithm by hit can only output error signals but not output result. In the application example of triple-fault-tolerant controller based on voting logic by word, both the automatic conversion links and self- checking monitoring circuits are added to the controller such that the reliability of system can be improved. The application result shows that the voting logic by word is of higher reliability, which can improve the fault-tolerance performance of the system.