Comparative analysis of automobile engines low-pressure fuel systems controlling on the basis of material and energy balances

Introduction. The maintainance of energy balance, the ensurance of modern environmental requirements and the guarantee of both uninterrupted operation of the engine and the entire fuel system require efective controlling of the low-pressure fuel system is required. The purpose of the study was to conduct a comparative analysis of the schemes, organization and methods of discrete control of a low-pressure fuel system; to make comparative studies of centrifugal pumps of various manufacturers; to determine their efficiency under various operating conditions. Methodology and research methods. To reach the purpose of the study the material balance of the low pressure fuel system was calculated. The energy balance equations were compiled to determine the overall picture of the energy use in the low-pressure fuel system and to identify the ways of its improvement. Scientific novelty and results. The results of a comparative analysis of ways to control a low fuel pressure system based on material and energy balances were presented. The principles of the low pressure fuel system with complex configuration tanks were described. The results of experimental studies of fuel pumps of different manufacturers were given. It has been established that the efficiency of the fuel pump did not depend on the pressure, being determined only by the fuel supply. When half reduced, the fuel supply led to the quarter -reducing of the efficiency of the pump. A comparative analysis of the schemes, organization and methods of frequency and discrete control of the low-pressure fuel system was carried out. The practical significance is presented by the results of the comparative analysis of the schemes, organization and methods of frequency and discrete control of a low-pressure fuel system, as well as of the systems effective functioning conditions for various speed and engine load modes.

low pressure fuel system, energy balance, hydraulic circuit, fuel pump efficiency, centrifugal pump, throttling, frequency control of fuel pumps, discrete control of fuel pumps

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