Failure cause diagnosis system and method

摘要

The invention is related to a system and a method to determine whether a target equipment deviates from a normal state. If it is determined that the target equipment to be diagnosed deviates from the normal state, the degree of deviation of each parameter from the normal state as the reference is calculated as an abnormal contribution ratio. A failure cause is estimated from a similarity ratio between the calculated abnormal contribution ratio and the abnormal contribution ratio of each of the failure causes collected in the past and including failure phenomena and failure parts.

主权项

1. A failure cause diagnosis system comprising a cause diagnosis device for diagnosing a failure cause of equipment;
wherein the cause diagnosis device includes: a normal case storage unit storing operational data in effect when equipment is in a normal state or values obtained by transformation thereof; an abnormal case storage unit storing operational data in effect when equipment is in an abnormal state or values obtained by transformation thereof; a diagnosis data input unit configured to receive data from an equipment sensor corresponding to target equipment and to input operational data about the target equipment to be diagnosed as diagnosis data; an anomaly diagnosis unit determining whether there is an anomaly by using the diagnosis data and normal-state data stored in the normal case storage unit; a cause diagnosis unit which, if it is determined by the anomaly diagnosis unit that there is an anomaly, estimates a failure cause based on a similarity ratio between an abnormal contribution ratio output from the anomaly diagnosis unit and an abnormal contribution ratio of each of failure causes stored in the abnormal case storage unit, the each failure cause including failure phenomena and failure parts, wherein the abnormal contribution ratios are each represented as lines in a two-dimensional plane and each similarity ratio is computed based on an angle between the abnormal contribution ratio output from the anomaly diagnosis unit and each abnormal contribution ratio of each failure cause; and a diagnosis result output unit outputting a result of diagnosis by the cause diagnosis unit, wherein equipment maintenance is conducted based on the result of the diagnosis.