Lei ZHANG, Lili HE, Xiaojun MA, Desheng LIU, Dequan KONG, Qingwu SHI

Sensor anomaly detection in the industrial internet of things based on edge computing

In the industrial internet of things (IIoT), because thousands of pieces of hardware, instruments, and variouscontrollers are involved, the core problem is the sensors. Detection using sensors is the bottom line of the IIoT, directlyaffecting the detection accuracy and control indicators of the IIoT system. However, when a large number of realtime data generated by IIoT devices are transferred to cloud computing centers, large-scale data will inevitably bringcomputing load, which will affect the computing speed of cloud computing centers and increase the computing load ofcloud computing data centers. These factors directly lead to instability and delay in sensor data collected in real timein the IIoT. In this paper, a sensor outlier detection algorithm based on edge calculation is proposed. Firstly, focusingon the problem of the large amount of data in terminal equipment of the IIoT, the edge technology method of datacompression is used to optimize the compression of sensor data, and different thresholds are set according to differentindustrial process requirements, so as to ensure the real-time aspect and authenticity of the data. Then, using theK-means clustering algorithm, the compressed test data sets are analyzed and the abnormal sensor detection values andlabels are obtained. Finally, the effectiveness of such an approach is evaluated through a sample case study involving atemperature control system.

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