Handling fault in ambient temperature measurements in a cooling system - A fault tolerant control approach

This paper proposes an active fault tolerant control (AFTC) scheme for detecting and correcting faulty measurements from the ambient temperature sensor that is utilized to calculate optimal setpoints a rooftop gas cooler unit operation. The are caused by improper placement of so it exposed heat generated directly or indirectly sun. AFTC designed in plug & play manner with no prior knowledge underlying system. system identified applying online identification algorithm. To ensure validity model several criteria established. resulting observer based controller including bumpless implementation correction when has been detected. proposed investigated using both experimental data as well simulation.