An approach is presented whereby a number of faults, typical of many hydraulic circuits, may be determined using rule-based concepts. The approach uses on-line data and principally integrates both qualitative and quantitative reasoning in a novel way that enables speciJic faults to be detected. It has the advantage of being able to indicate a class of multiple faults and can also provide some indication of sensor integrity. A practical example is presented using an open-loop meter-inlmeter-out flow control system, and a variety of single and multiple faults have been studied with respect to leakages, check valves andflow control valve behaviour.
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