The article presents a new method for assessing the technical condition of a compression-ignition (CI) internal combustion engine. The assessment is based on the analysis of changes in the physicochemical properties of used engine oil, with particular emphasis on kinematic viscosity at 100°C at the time of oil change in the engine.The usefulness of the new method was verified in operational tests of 5 engines of the type. A significant problem in operational practice is the assessment of the technical condition of an engine, and consequently, the wear of the piston-piston ring-cylinder (PRC) system components.
The methods commonly used to date require partial disassembly of engine components in order to perform appropriate measurements (e.g., micrometry, compression pressure measurement). A separate group consists of methods allowing for continuous observation of the wear process of frictionally cooperating elements. The isotopic methods used in this case, for example, are expensive and require specialized preparation and equipment, hence they are not widely used in technical diagnostics.
Analysis of the piston-piston ring-cylinder system as a tribological system indicates that the lubricant contained within it can be a significant source of information.
Among all elements of the tribological system [1], engine oil undergoes the most intense physical and chemical changes during operation. This results from the system’s interaction with the oil. The magnitude of the forces acting on the engine oil is related, among other things, to the technical condition of the PRC system expressed by the size of clearances (…)
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Source: Logistyka Magazine