Abnormality detection apparatus, abnormality detection method, and computer readable medium

An abnormality detection method used for an abnormality detection apparatus that includes a sensor and detects an abnormality of a facility controlled by a control signal, the abnormality detection method comprising:

• obtaining an abnormality degree of a control signal in a specific time range by inputting to a control signal model which is a model that is generated based on training data which is a feature amount of time series data of a past control signal and outputs the abnormality degree for each control signal from the time series data of the control signal, the time series data of the control signal in the specific time range of an abnormality detection result detected in a sensor signal obtained from the sensor, as verification data, and calculating the reliability of the control signal in the specific time range and;
• outputting information in which the reliability of the control signal in the specific time range is added to the abnormality detection result in the specific time range, as an abnormality diagnosis result.

A non-transitory computer readable medium storing an abnormality detection program used for an abnormality detection apparatus that includes a sensor and detects an abnormality of a facility controlled by a control signal, the abnormality detection program for causing a computer to execute:

• a reliability process to obtain an abnormality degree of a control signal in a specific time range by inputting to a control signal model which is a model that is generated based on training data which is a feature amount of time series data of a past control signal and outputs the abnormality degree for each control signal from the time series data of the control signal, the time series data of the control signal in the specific time range of an abnormality detection result detected in a sensor signal obtained from the sensor, as verification data, and to calculate the reliability of the control signal in the specific time range and;
• an abnormality diagnosis process to output information in which the reliability of the control signal in the specific time range is added to the abnormality detection result in the specific time range, as an abnormality diagnosis result.