Machinery & Energetics

The article analyzes methods of diagnosing cylinder-piston group (CPG) of internal combustion engines. The specified method of diagnostics is offered, combining all the positive sides of the existing methods and solves the problem of increasing the reliability of the estimation of the technical condition of the units and mechanisms of the ICE. A mathematical model has been developed that takes into account the scroll frequency, gaps, and the phase of the pressure change process, which allows to obtain the dependencies of the pressure change in the combustion chamber. A certain pattern of pressure reduction at the end of the compression stroke with the increase of the wear value of cylinders, rings, and piston, which affects the technical condition of the cylinder-piston group, is revealed. The graphs of the dependencies between the considered modeling parameters are presented.

cylinder-piston group, diagnosis, speed, compression, pressure waveform, modes, parameters