Abstract
This paper presents the methodology and results of tests of the start-up wear of the cylinder liner in vehicle diesel engines. The conducted tests were aimed at determining the starting wear of the cylinder liner, as well as the influence of the starting temperature and other factors on the observed wear value.
Highlights
The start-up of a vehicle internal combustion engine is a transitional process accompanied by the occurrence of many negative tribological processes
As the engine oil flows to the engine tribological nodes, the boundary friction turns into mixed friction
The described transition from boundary friction to mixed friction with a low percentage of liquid friction causes that adhesive and abrasive wear can be observed in the tribological nodes of the internal combustion engine during start-up, in addition to corrosive wear in the PRC system [6,8]
Summary
The start-up of a vehicle internal combustion engine is a transitional process accompanied by the occurrence of many negative tribological processes. At the beginning of the startup, due to insufficient amount of engine oil (inertia of the engine lubrication system) and too low relative velocity of the moving surfaces of its tribological pairs, the occurrence of the so-called boundary friction is noted [5,6,10]. When a sufficient relative velocity and amount of lubricating oil are achieved between the moving surfaces of kinematic pairs (usually occurring after the engine start-up), favourable conditions for the occurrence of liquid friction appear [7,10,11]. The described transition from boundary friction (in extreme cases from dry friction) to mixed friction with a low percentage of liquid friction causes that adhesive and abrasive wear can be observed in the tribological nodes of the internal combustion engine during start-up, in addition to corrosive wear in the PRC system [6,8]. The values of the equivalent start-up wear range from a few to several hundred or even several thousand kilometres of vehicle mileage or several (up to 10) hours of operation on an engine test bench [6,11]
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