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Anomaly detection system and anomaly detection method

An anomaly detection and anomaly technology, applied in the direction of test/monitoring control system, general control system, neural learning method, etc., can solve problems such as inability to work effectively, and achieve the effect of high precision and easy threshold

Active Publication Date: 2021-01-26
HITACHI LTD
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Problems solved by technology

On the other hand, when the value of the work data fluctuates during the transition period, etc., the above-mentioned method may not work effectively.

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  • Anomaly detection system and anomaly detection method
  • Anomaly detection system and anomaly detection method
  • Anomaly detection system and anomaly detection method

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no. 1 approach

[0060] Here, first, an overview of the abnormality detection system and the abnormality detection method according to the present embodiment will be described. In addition, the abnormality detection system of the present embodiment prevents the system (industrial systems such as factories, or social infrastructure systems such as railways and electric power systems, etc.) that become the monitoring target from functioning down, and quickly and accurately discovers and predicts the failure of the monitoring target system. , obstacle, or its harbinger.

[0061] The processing in the anomaly detection system in this embodiment is divided into a learning phase in which a predictive model is learned based on the normal operation data in the above-mentioned monitoring target system, and an interval between the operation data in the monitoring state and the prediction result of the prediction model. In the monitoring phase, an abnormality score is calculated based on the deviation si...

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Abstract

The present invention provides an anomaly detection system and an anomaly detection method, which makes it easy to set the threshold for anomaly detection and increases the accuracy. It is assumed that the anomaly detection system (1) includes an arithmetic device (1H101) that performs a process of learning a prediction model for predicting the operation of a predetermined device to be monitored based on operation data of the device; Processing of adjusting an abnormality score, which is a deviation between a prediction result based on the prediction model and the operation data obtained from the device, so that the abnormality score obtained with respect to normal operation data falls within a prescribed range. an abnormality score; a process of detecting an abnormality or a sign of an abnormality based on the adjusted abnormality score; and a process of displaying information on at least any one of the abnormality score or the detection result in an output device.

Description

Technical field [0001] The present invention relates to an anomaly detection system and an anomaly detection method. Background technique [0002] Various systems, such as industrial systems such as factories, and social infrastructure systems such as railways and electric power, are composed of multiple computers, controllers, and machines / devices. [0003] If such a system ceases to function, it may have a huge impact on both the economy and society. Therefore, in order to prevent the function of the system from stopping, it is important to quickly detect and respond to malfunctions and obstacles, or to predict and take protective measures to prevent problems before they occur. [0004] On the other hand, recently, a large amount of work data is obtained from computers, controllers, machines / equipment, etc. Therefore, the following method is used: expressing the normal behavior of the machine / equipment or system as a statistical model, and detecting abnormalities or othe...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B23/02
CPCG05B23/0213G06Q50/10G06N3/08G05B23/024G06N3/047G06N3/044G06N3/045G05B23/0254G01D3/08
Inventor 但马庆行望月义则
Owner HITACHI LTD