Integrated Design of Model-Based Passive Fault-Tolerant Control for Nonlinear Systems Based on PID and Fuzzy Control

Abstract

This paper offers an integrated design of passive fault-tolerant control (PFTC) for nonlinear systems using fuzzy and conventional PI controller in the presence of modeling uncertainty along with actuator/sensor in the abrupt and incipient form of faults. The significant advantages of the suggested PFTC approach are that it can guarantee the closed-loop system stability and also has the robustness to the unmodeled dynamics and faults. The proposed strategy uses a fuzzy logic to design a PFTC to detect the faults. The integrated strategy is demonstrated to be effective through a two-tank interacting hybrid system (TTIHS) example of a two-tank benchmark system using integral errors IAE, ISE and ITAE. Simulation results validate that the proposed integrated design of PFTC scheme realized a good dynamic performance of the TTIHS and a smooth setpoint tracking with actuator/sensor faults in two forms of nature.