Reconfigurable adaptive fuzzy fault-hiding control for greenhouse climate control system

Modern greenhouses are equipped with different components for providing a comfortable climate for plant growth. A component malfunction may result in loss of production. Therefore, it is desirable to design a control system, which is stable, and is able to provide an acceptable degraded performance even in the faulty case. In this paper, an active fault tolerant control scheme to compensate for actuator and/or sensor faults in the greenhouse climate system is designed. The control system consists of a sensitive and reliable Fault Detection and Diagnosis (FDD) mechanism for different types of faults in presence of system disturbances and a robust reconfigurable control design based on fault-hiding principal in which the fault is hidden from the nominal controller and the fault effects are compensated. In this approach, a set of virtual actuators and virtual sensors are used to guarantee the recovery of closed-loop stability and the tracking of constant reference inputs. A configurable self-tuning state-feedback fuzzy-PI controller is used to correct faulty performance. The activeness of the proposed scheme has justified by simulation results on multi-input multi-output nonlinear greenhouse climate control system.