Abstract
The accuracy of the algorithm for fault diagnosis by use of a signed digraph and a 5-range pattern has been improved, utilizing the fact that the deviation of the state variable from its normal value caused by system failure damps as the distance between the variable and the origin of failure increases. Furthermore, a method of evaluating the accuracy of this algorithm is proposed, utilizing the greatest set of candidates. The algorithm's accuracy is compared with that of other algorithms by fault diagnosis in tank-pipeline systems.
