Factors considered when assessing wear of internal combustion engine cylinders

Abstract

Determining cylinder wear using calculation methods and predicting engine durability are of great practical importance. In addition, knowledge of the wear diagram of designed engines is necessary for the development of optimal cylinder manufacturing technologies that ensure maximum engine life during operation. Obtaining an operational wear diagram for new engines requires a significant amount of time and high material costs. To achieve reliable results, it is necessary to conduct research on many engines over a long period. Creating a mathematical model for calculating cylinder wear significantly speeds up the process and reduces costs, allowing you to obtain the necessary data several times faster and cheaper. However, to date, there is no single and reliable method for calculating cylinder wear. This is due to the large number of factors that affect the wear of internal combustion engine cylinders, and their different effects on different engines and in different operating conditions. All factors that affect the intensity of cylinder wear can be conditionally divided into two groups: internal and external. Internal factors include those that cannot be changed during operation, in particular: the design features of the engine and the physical and mechanical properties of the rubbing materials (bushings, rings, piston). External factors include a large number of variable parameters that can vary during operation, such as: used oils, air, fuel and oil purity, operating modes (load, speed, temperature), as well as indicator parameters of engine operation (compression ratio, boost ratio, maximum combustion pressures, gas temperatures, etc.).