Diagnosis of sensor and actuator faults of a class of hybrid systems based on semi-qualitative method

On the basis of a three tank system, a semi-qualitative approach to diagnosis of sensor and actuator faults of a class of hybrid systems is proposed. Under the framework of hybrid bond graph, some improvements are further carried out. In the qualitative reasoning, an improved temporal causal graph with additional nodes is introduced. This extends the original method to diagnosis of sensor and actuator faults of hybrid systems. Finally, computer simulations are done which demonstrate the effectiveness of the proposed approach.