On Intelligent PID Control Algorithms For Speed Regulation Of Marine Diesel Engine In Ship's Propulsion

Propulsion and generating-sets of the vast majority of merchant ship utilize marine diesel engine as prime movers. The approaches ensure the engine running at the best tradeoff point of economy, power and emission, which has been the very urgent task related to the current research in electronic control of marine diesel engines. Especially, the even more strict laws of emission exert higher requirements on the high quality of marine diesel engine controller.The emphasis of this thesis is digital intelligent PID controller for speed regulation of marine diesel propulsion engine, to ensure the engine speed following a desired reference speed perfectly despite the presence of disturbances. Traditionally, the control of engine speed is realized by classical gain-fixed PID controller on the variable running conditions of diesel engine. However, this method provides no guarantees for control quality of marine diesel propulsion engine, which is a complex system working in roughly changeable operating regimes at sea. Firstly, the paper compounds fuzzy control, variable universe theory and PID control in order to design fuzzy self-adaptive PID controller and variable universe fuzzy self-adaptive PID controller, which can improve performance related to classical PID controller. Secondly, by compounding fuzzy control, the immune feedback principle and PID control, fuzzy immune nonlinear PID controller is constructed. Moreover, the detailed design steps of above mentioned controllers are presented in this work.This thesis focuses on a simplified linear model of large low-speed two-stroke marine diesel propulsion engine and seeks better methods related to design higher quality intelligent PID controllers. Adopted the designed controllers decode the speed control systems have done a lot of simulation testing in environment of MATLAB/Simulink. The simulation results indicate that, compared with classic gain-fixed PID controller, designed intelligent PID controllers with higher accuracy and robustness,are efficient approaches to development digital governor of marine diesel propulsion engine.