Design of a dynamic threshold generator for λ-tuned control loops

A dynamic threshold generator is employed for detecting faults in λ-tuned control loops. To this end, an optimization algorithm for dynamic threshold generators is proposed. The a priori information from λ-tuning is used in designing a state estimator with integral action. A dynamic threshold generator for the residual of this state estimator is derived and the optimization algorithm is applied. Simulations with measurement data from an experimental water tank setup show that the method is capable of detecting a small fault without generating false alarms.