Abstract
Abstract In order to handle the non-linear system and the complex disturbance in marine engines, a finite-time convergence active disturbance rejection control (ADRC) technique is developed for the control of engine speed. First, a model for the relationship between engine speed and fuel injection is established on the basis of the mean value engine model. Then, to deal with the load disturbances and model parameter perturbation of the diesel engine, this paper designs an ADRC approach to achieve finite-time stability. Finally, simulation experiments show that the proposed method has better control effect and stronger disturbance rejection ability in comparison with the standard linear ADRC.
Highlights
Marine diesel engines are widely used in the domain of ship propulsion [1, 2]
In order to verify the effectiveness of the proposed FT-SADRC, the RT-Flex60C low-speed two-stroke marine diesel engine, which is installed on the container ship of Orient Overseas International Limited (OOIL), is chosen for the simulation experiments
The new observer is non-linear, the adjustment parameters are the same as for linear extended state observer (ESO), which reduces the difficulty in the application of the non-linear observer
Summary
Marine diesel engines are widely used in the domain of ship propulsion [1, 2]. The most crucial task is to have a reliable control system to regulate its speed for safe and efficient operation under the inherent instabilities and disturbances, coupled with the unpredictable external environment [3]. For the speed controller of a marine engine, the main task is to deal with the uncertain disturbances and the adjustment of system parameters. In addition to ADRC, the ESO can be combined with other control methods to deal with uncertain disturbances and be simplified into a linear ESO (LESO) [15,16] for easier parameter adjustment [17]. In the section titled ‘ADRC design’, we use an inverse hyperbolic sine function to design a non-linear ESO for the diesel engine speed model. The new non-linear ESO method, which has few adjustment parameters, is proposed to achieve precise control of marine diesel engine speed under uncertain disturbances. In the ‘Conclusion’ section, conclusions and future research directions are presented
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