Implementation of non-intrusive fault detection in embedded control systems

Paper presents fault detection in embedded control systems by the so-called monitoring cells. The basic idea is to monitor input/output variables and internal states of systems, processes or sub-processes by using acquired and built-in knowledge about the normal behavior in order to detect abnormalities. Paper gives the detailed architecture and the operation of the monitoring cells. The concept is applicable even if only a limited knowledge about the control system is available. In such cases the proposed automated learning of the monitoring function can be used. In the second part, two different implementations of the monitoring cell are presented. The first one uses discrete analogue devices and a field programmable gate array. The second is based on the programmable system-on-a-chip devices.