Study of Characteristics of Engine Operation in Stress-Testing Mode of Electric Gasoline Pump

摘要

We theoretically determined the estimated model for the fuel supply system, which allows us to investigate the relationship of the maximum engine crankshaft speed with the change in the technical condition of individual elements of the fuel system. The change in the pressure and capacity of the fuel system is associated with the change in the flow characteristics of the electromagnetic injectors, filter resistance, and technical condition of the pump. In connection with various mechanisms of failures of the fuel system elements and changes in their technical condition, we considered a simulation model of the fuel system. We presented the results of studying the output characteristics of electric gasoline pumps of the vehicles' fuel system. We considered two diagnostic methods to determine the technical condition of the pump: dynamic and static. To control the technical condition of the fuel system elements, we developed a testing method based on load and stress testing. For a pump used in a vehicle, the change in its characteristics with the change in the supply voltage typical for these conditions is of a great importance. The paper presents a study of the relationship between the technical conditions of the gasoline electric pump with its quality indicators of the fuel system operation. We determined that it is possible to monitor the technical condition of the pump by measuring the difference of the values of the crankshaft speed when the sparking and fuel supply are off. We presented experimental results by the dynamic method, which has the most informative and information capacity.