Development of Pump‐Valve Coordinated Systems With Fuzzy Adaptive Fault‐Tolerant Control for Improved Performance

ABSTRACT Generally, valve‐controlled systems excel in tracking precision but suffer from high energy consumption, while pump‐controlled systems exhibit high energy efficiency yet struggle with unsatisfactory response capabilities. This paper develops a pump‐valve coordinated (PVC) system that employs robust adaptive control techniques integrated with fuzzy theory to address nonlinearities and uncertainties, achieving both high precision and high energy efficiency. An innovative dominant input control strategy is introduced to manage the coupling effects in the compound actions of the PVC system. Furthermore, valve operation may experience sticking and increased frictional resistance, whereas pump operation may encounter internal component wear and excessive leakage. Therefore, fault‐tolerant control is incorporated to manage additional terms generated by actuator faults. Multiple fuzzy approximators are designed to handle various potential uncertainties in the system, allowing for more comprehensive control performance and broader applicability. The Lyapunov analysis illustrates that all states of the system are semi‐globally stable, and the tracking error converges to a small neighborhood containing the origin. Finally, the effectiveness of the fuzzy adaptive fault‐tolerant (FAFT) controller is validated through comparative simulations for the PVC system.