N. N. Poltorykhin, M. V. Nikiforov

A METHOD FOR IDENTIFYING THE OPTIMAL OPERATING PARAMETERS OF AN INTERNAL COMBUSTION ENGINE DIAGNOSTIC DEVICE

The paper discusses selecting the optimal operating parameters of a device for diagnosing internal combustion engines. A laboratory experiment procedure is developed, the experiment layout being approved. Mathematical planning is used to compile a planning matrix of a three-factor experiment 33. The objects of the study are pneumatic valves, air pressure in a pneumatic system, and the compressed air supply interval in degrees of the crankshaft rotation. The experiment yields data on the camshaft angle after the termination of air supply to an internal combustion engine cylinder as dependent on the variation of the set device parameters. The data are statistically processed, with the calculation of the necessary values of the mean, variance, and coefficient of variation. The verification of the accuracy of the data testifies to the repeatability of the process. The results obtained from the experiment are statistically analyzed to generate regression equations. The study presents 3D surface plots and 2D plots showing the angle of camshaft rotation after the cessation of airflow to the engine cylinder as dependent on the values of variable factors. The analysis of the laboratory experiment results allows us to determine the most efficient design and process parameters of an internal combustion engine diagnostic device. The following parameters of the
diagnostic device are determined: a pneumatic valve area of 29.5 to 34.5 mm2, a system pressure of 0.48 to 0.62 MPa, and a compressed air supply interval (in crankshaft rotation degrees) of 140 to 180°, which allows for a camshaft rotation angle of 95 to 110 degrees.

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