On-line fault detection and isolation techniques have been developed for automated processes during the last few years. These methods include algebrical methods artificial intelligence methods or combinations of the two methodologies. This paper includes a reference to recent research work on algebrical methods, an extensive presentation of artificial intelligence methods used for the fault detection process in technical systems and relevant survey material. Special reference is made to the on-line expert systems development where specific resent research work is illustrated.

Keywords: Fault detection, diagnosis, artificial intelligence techniques, on line systems