| Nowadays, because of low pollution, low fuel consumption and high power,electronic-controlled diesel engines have become one of the choices for ship’s active force. It is necessary to study the controlling of the propulsion system of electronic-controlled diesel engine. It can not only optimize the operation and management system, but also save energy and reduce emission in the shipping industry.The model of marine electronic-controlled diesel engine is difficult to be determined;measurement and load are disturbed by wind, wave and flow at water. In order to solve those issues, strategies on rotational speed control are put forward based on Active Disturbance Rejection Control (ADRC), as follows:Propulsion control of marine electronic-controlled diesel engine based on ADRC of homogeneous finite time convergent: in order to solve the problem of model perturbation caused by the uncertain dynamic factors, ADRC which does not rely on precise model was applied to control the propulsion system, and then an error feedback control law of homogeneous finite time for ADRC was put forward, and convergence proof and simulation experiments were carried out. The results show that the improved algorithm has good effect on speed control of marine diesel engine.Study and application of finite time convergence ADRC with dead zone and anti-saturation disturbance compensation: due to the unpredictable load disturbance caused by complex marine situations, the control system functions frequently and the saturation of control input appears, a finite time algorithm with dead zone and saturation disturbance compensation for ADRC is designed, and the stability is proved. And then the algorithm is applied to Marine electronic-controlled diesel propulsion system, the simulation experiments show that the precision of the control system and the disturbance rejection are improved, the operating frequency of the controller is reduced,and the function of control input constraint is improved.Finite time convergence ADRC based on signal processing and the application of speed control for marine electronic-controlled diesel engine: in order to deal with the measuring disturbance caused by the complex marine conditions, the active disturbance rejection ability of finite time convergence ADRC is explored,and accordingly a finite time convergence ADRC algorithm is proposed based on inverse hyperbolic sine function filtering. Finally, the improved algorithm is applied to marine electronic-controlled diesel propulsion control system,and the simulation experiments show that the algorithm can restrain disturbance measurement.Discrete finite time convergence ADRC based on filtering: for the ship control is mostly in discrete form and the measurement disturbance is affected by complex marine conditions, a discrete ADRC algorithm is proposed based on discrete inverse hyperbolic sine function filter with finite time convergence. In order to reduce the system parameters, a parameter adaptive control method is designed. Finally, the finite time convergence of the discrete system is analyzed and applied in the marine electronic-controlled diesel engine propulsion system. The experimental results show that the improved algorithm has less control parameters and better control performance. |
