The Simulation Research On The Speed Control Of Large-Scale Low-Speed Marine Diesel Engine

With more and more strict requirements for the discharge of engines, how to apply electronic controls to diesel engines is becoming an extremely urgent task in current research. Electronic controlled diesel engines have so many characteristics, such as more adjustable parameters, accuracy of regulation, great flexibility and freedom, etc. All of these can ensure the engine to run at the best compromised point in terms of economy, power and discharge. Consequently, it can make the engine be at the best performance state. Building the so-called 'Virtual Laboratory' in order to model and simulate the engine and its control methods based on the use of numerical simulative technology and advanced software; then to compile the model and finally generate practical control code. It undoubtedly plays an important role in helping us to recognize and master the common methods of designing and controlling the engine, to validate the controlling strategy, to optimize the control parameters, to shorten the developing period and to improve the working efficiency.Based on the MATLAB/SIMULINK software and the Linear Parameter-Varying Modeling of the Large-Scale Low-Speed Marine Diesel Engine made by senior fellow apprentice Wang Haiyan, the writer of this paper investigates the performance of traditional controlling theory such as PID on speed control, who also presents that we can combine fuzzy logic control with PID control, which can apply the manual control experiences to the system by analyzing the problems that the traditional PID algorithm faces. Meanwhile, the writer builds a robust self-poise controller and makes comparison with the results of former simulation by taking the robust-control's advantage of stabilization. The results show that the engine controlling performance improves greatly, the overshoot reduces and the responsive speed increases. Generally speaking, the effect is obvious, especially in overcoming the disturbance (such as the change of load).The research presented in this thesis is only a primary job in developing practical diesel controller; however, the importance lies in rendering an advanced proposal, which supplies a support in theory and software basis and also a direction of methodology for further research. What's more, this thesis has absolutely positive...