Research of vibroacoustic diagnostics of fuel system of engines of combine harvesters

To determine the diagnostic parameters of the fuel system of engines of grain harvesters, technological and structural parameters of the technical condition were considered. The authors investigate the structural schemes of indicator connection of the purpose (performance) of the fuel system of engines and parameters of the technical state of its structural elements. For example, we consider the modal structure diagram, which characterizes the fuel system of grain harvester engines and parameters of the technical state of their structural elements. For example, we consider the modal structure diagram, which describes the fuel system of the engines. At the highest level there are parameters that describe the process of fuel supply and directly determine the characteristics of injection, or the law of fuel supply. On the lower levels there are parameters that characterize the technical state of the most important elements of the fuel equipment. They are used for elemental diagnostics. Experimental studies of vibration characteristics of nozzles of diesel engines have shown that the energy vibration nozzles manifested most actively at the frequency from 5 kHz to 10 kHz. Application of Hilbert’s conversion to vibration analysis has made it possible to use the ability to control the identity of nozzles and identify defects, such as breakage of nozzles and spray gun hangs. When the injection pressure changes from 27.0 MPa to 8.0 MPa, signal duration, which is measured between the front and rear fronts with maximum amplitudes, decreases 2 times. Application of technological cards together with diagnostic means will allow in 1,5 times to cut down the technical equipment due to technical problems at expense of preventing bursts and reducing the fuel consumption by 5-10 %. The range of sensors for diagnostics of diesels, the basic electric circuit of the tool for measuring the angle are developed for fuel supply, the requirements for the computerized system for bench diagnostics of the fuel equipment.