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The performance of various types of control systems for an electric governor of a diesel engine was examined. The amount of fuel injection of a diesel engine is usually controlled by an electric governor system in these decades, and a PID controller is installed for the electric governor. Even when the optimal parameters for PID controller are well tuned, it is difficult to keep constant rotation speed of the engine, because the applied load to generators may vary according to its running conditions. In this study, a neural network was applied to regulate the parameters in the PID controller for the axial-moving DC motor to control the amount of fuel injection. Experimental studies show that the parameter regulation system using neural network presented here showed good performance under various running conditions. Furthermore, it was shown that various types of training algorithms were applied to neural network control systems and their performance was compared.

Three types of control system for an electric governor of a diesel engine developed for generators were examined experimentally. The quantity of fuel injection of a diesel engine for generators is usually controlled by an electric governor system in these decades, and a PID controller has been installed for the electric governor. Even when the optimal parameters for PID controller are well tuned, it is difficult to keep constant rotating speed of the engine, because the applied load to generators may vary according to its running conditions. In this research, a neural network was applied to regulate the parameters in PI controller for the axial-moving DC motor to control the quantity of fuel injection. Experimental studies showed that the parameter regulation system using neural network presented here had good performance under various running conditions.

The horse power and emissions of a heat insulated engine with high heat insulation rate* over 70% was investigated, as a result, a deterioration of power and emissions has become clear to be caused by change of combustion in the tests. Therefore, the observation of the combustion process in high temperature air has been carried out in the engine by using a high speed camera. We have investigated the combustion process included progress of injected fuel spray, ignition, extension of flame, and formation of soot in a vessel charged with air of high temperature and pressure with the gas condition in an engine cylinder. The test result showed that diesel fuel did not penetrate straight forward in the high temperature air, and the tip of the jet stream spread in such a shape like a lump of cloud and the spray is ignited in a short ignition delay. The flame extended widely in the free jet stream, however we observed soot formations here and there in the flame.