The Design Of Temperature Controller For Cooling Water System Of Ship Diesel Engine

This paper, taking the main diesel engine cooling water system in the training ship("YuKun") of Dalian Maritime University as the control object, aims to design the controller for cooling water temperature. First of all, based on relevant theory of thermodynamics and heat transfer, the mathematical and thermal models of the main diesel engine cooling water system are established by thermal analysis of heat transfer in the diesel engine cylinder and cooler. Secondly, simulation test for the mathematical and thermal models of the main diesel engine cooling water system is conducted in the platform (MATLAB/Simulink) in order to verify the vital data as well as prove the reliability of the mathematical and thermal models of the main diesel engine cooling water system.After that, in terms of the nonlinear, large inertia and long delay characteristics of the main diesel engine cooling water system, the corresponding solutions for cooling water temperature control are worked out. In detail, adaptive PID controller is designed using the offline/online genetic algorithm and simulation test for the adaptive PID controller is conducted again in the platform (MATLAB/Simulink) in result of ideal effect.Finally, visual programming for the diesel engine cooling water temperature control system is done in the Xcode programming environment. In the procedure of visual programming for the main diesel engine cooling water temperature control system, the corresponding subclasses for various modules are created through the object-oriented objective-c language. At the same time, each subclass is packed and data exchange is achieved by principal-agent, protocol and other communication methods.