Determination of diagnostic equipment indicators by the value of pressure discharge at the engine intake stroke

Abstract

The research findings on the dependence of the level of air discharge pressure at the intake stroke of a gasoline engine on the values of the leak area are discussed. To conduct the study, the VAZ-21114 gasoline engine technological stand and specialized diagnostic equipment Scandoc were used. Specialized devices with calibration holes were developed for the research where the holes were selected taking into account the possibility of low-cost production. It was found that the level of deviations was also directly proportional to the increase of the leak area as the level of the analog-to-digital signal of the pressure discharge sensor. The deviation level is 0.04 atmospheres while the deviation level of 0.03 atmospheres with a leak area of 12.5 mm² indicates that an increase of the intake stroke leak area approaching a critical value forces the ignition systems and the cylinder-piston group of the car engine to operate with large interruptions in uniformity due to large deviations in the parameters of the car engine functioning from the basic ones. With further increase of the leak area, there is a sharp increase in deviations from the normal pressure discharge at the intake stroke while the indicator of uneven rotation of the crankshaft increases sharply which indicates a decrease in the number of engine revolutions as a result of unstable operation of the ignition system due to too poor fuel-air mixture supplied to the engine resulting in unstable engine operation and reduced performance. The findings of this research fully confirm the performance of specialized technological equipment developed at the National Research Ogarev Mordovia State University for monitoring the technical condition of the air supply system.