Jakovenko A. Improvement of operational control of marine diesel engines working procedures

The thesis is devoted to solving an important theoretical and practical problem – improvement of efficiency of marine diesel engines operation through control performance enhancement. Continuous control of working processes with application of a new technique and its realization by use of the combined measuring converters on the basis of structural fuel injection components is applied. There is determined the most informative parameter of fuel injection process – the pressure in the high pressure fuel pump. A new method for pressure signals registration is suggested – the application of the combined measuring converter on the basis of high pressure fuel pump studding. The converter’s metrology parameters calculation and its design study are performed. Measuring system layout is executed. The development process is realized in the motorless stand environment. There is developed the program complex for the frequency analysis of metrology data of the measuring system with specialized interface for experimental data. The comparative amplitude-frequency assaying of registration of fuel pressure is made. For the analysis of fuel supply parameters it is suggested to use mathematical simulation of fuel injection process. As the basis there is used the method of hydrodynamic calculation of prof. Y.Y. Fomin. Boundary conditions for marine middle speed diesel engine fuel supply system are defined. As a result of the research there is displayed good convergence of pressure record in both modes - experimental researches in comparison with a basic approach registration. The exception was admitted by fractional injection at which affects the combined converter - high pressure fuel pump and its drive gear system’s detention lag. Key words: diesel engine; fuel injection; fuel pressure sensor; characteristics.