Abstract
In this paper, in order to handle the nonlinear system and the sophisticated disturbance in the marine engine, a finite-time convergence control method is proposed for the diesel engine rotating speed control. First, the mean value model is established for the diesel engine, which can represent response of engine fuel injection to engine speed. Then, in order to deal with parameter perturbation and load disturbance of the marine diesel engine, a finite-time convergence active disturbance rejection control (ADRC) is proposed. At the last, simulation experiments are conducted to verify the effectiveness of the proposed controller under the different load disturbances for the 7RT-Flex60C marine diesel engine. The simulation results demonstrate that the proposed control scheme has better control effect and stronger anti-interference ability than the linear ADRC.
Highlights
For the energy efficient and environmental friendly, diesel engines are widely used in ship transportation [1, 2]
With the development of diesel engine technology, electronically controlled diesel engines have replaced mechanically controlled, and many speed control methods have been developed [4]. ese methods fall into two main categories: model-based control method and black box method [5]. e control methods based on the model mainly include adaptive control, system identification, robust control, variable structure control, stochastic system theory, and optimal control [6,7,8]. ese above methods depend on an accurate mathematical model, but it is difficult to achieve in practical engineering applications
In the theory of active disturbance rejection control (ADRC), both inherently unstable and unpredictable external load disturbances are treated as a “total disturbance,” which is expanded to a new state of the system and estimated and compensated by the extended state observer (ESO) [15,16,17]
Summary
For the energy efficient and environmental friendly, diesel engines are widely used in ship transportation [1, 2]. The primary task of the control system of the diesel engine is to keep the speed steady in the inherently unstable and unpredictable external environment [3]. Different from the first method, the black box method does not need precise mathematical model and usually includes the classic PID control [9], fuzzy control [10], and active disturbance rejection control (ADRC) [11] as mentioned previously. E speed control effect of the diesel engine is affected strongly by the inherently unstable and unpredictable external load disturbances; the active disturbance rejection control has attracted much attention due to its excellent disturbance resistance [12,13,14]. Compared with the wide application and theoretical research of LADRC, it is noted that the nonlinear ESO proposed in this manuscript is rarely studied [2, 21]. erefore, it is essential to further study the nonlinear extended observer
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