Abstract
In this article, a finite-time observer-based speed control strategy for the marine diesel engine is proposed with consideration of system parameter uncertainties, external disturbances and input constraints. Initially, a finite-time disturbance observer is designed, by which the synchronized uncertainties are accurately estimated in the sense of finite-time stability. Based on the observed information, a speed control strategy is proposed, and practical finite-time stability of the closed-loop system is demonstrated by rigorous theoretical analysis. Besides, for solving the input constraints inherent with the speed control system, an auxiliary variable is introduced to compensate the extra part of control output signals. Finally, numerical simulation and comparison are presented. The common operation situations of the marine diesel engines are taken into account, including starting, acceleration and deceleration between speed set points, sudden load changing, varied propulsion system parameters and different slope limits, etc. Comparing with the related existing method, the effectiveness and advantages of the proposed finite-time observer-based control law are illustrated.
Highlights
Diesel engines are extensively used as main engines and electric generators in ship industry by virtue of high thermal efficiency, reliable performance, and economic advantages [1]
When diesel engine is employed as marine main engine, the speed control of the engine is crucial for guaranteeing smooth cruise, since engine speed directly effects on the ship sailing speed [2]
Li et al.: Disturbance Observer-Based Finite-Time Speed Control for Marine Diesel Engine With Input Constraints study finite-time control problem for soft landing on asteroid, numerical simulation results show that the proposed method shows faster convergence rate and better disturbance rejection properties than the asymptotically stable controller
Summary
Diesel engines are extensively used as main engines and electric generators in ship industry by virtue of high thermal efficiency, reliable performance, and economic advantages [1]. X. Li et al.: Disturbance Observer-Based Finite-Time Speed Control for Marine Diesel Engine With Input Constraints study finite-time control problem for soft landing on asteroid, numerical simulation results show that the proposed method shows faster convergence rate and better disturbance rejection properties than the asymptotically stable controller. The application of finite-time control methods and observer techniques would potentially improve engine speed control system performance, which is worthwhile to be studied. Given the challenges stated above, this work develops finite-time disturbance observer and finite-time controller for diesel engine speed control system in the presence of input constraints.
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