A fault detection approach using both control and output error signals in frequency domain

This paper is to explore further results regarding Total Fault Information-based Residual (ToMFIR) approach to fault detection in dynamic systems. The TomFIR contains the essential fault information and remains unaffected by control actions in a closed-loop system. It is composed of control input residual and output error residual. The TomFIR is formulated in frequency domain. More importantly, the ToMFIR is able to detect faults/failures resulting from control-used computer. Currently, all of existing fault-detection schemes cannot achieve the same task at all. A practical DC motor example, with a PID controller, is used to demonstrate the effectiveness of the ToMFIR-based fault detection. Comparison with standard observer-based technique is also provided.