Finite-Time Fault-Tolerant Control for Diesel Engine Air Path via Extended State Observer

Abstract

This paper investigates a finite-time observer-based fault-tolerant control scheme for the diesel engine air path, which suffers from loss-of-effectiveness and addictive actuator faults. Initially, an auxiliary system including synchronized perturbation caused by the actuator faults is considered, and a coordinated transformation is introduced to facilitate the observer design. Then, an extended state observer is developed based on the system after transformation. With the proposed observer, the actuator fault effects are reconstructed, and the fast finite-time stability of the observation error dynamics is proved theoretically. Moreover, on the basis of the observation states and a super-twisting algorithm, a fault-tolerant control law is further designed to the guarantee that state tracking errors converge to the equilibrium in finite time. In addition, rigorous analysis of the closed-loop system is addressed by utilizing a Lyapunov stability theory. Finally, the numerical simulation results and comparison are presented to illustrate the effectiveness and reliable performance of the air path control system.

Keywords

• Extended state observer
• fault-tolerant control
• sliding mode control
• finite-time stability
• diesel engine air path