Abstract
The paper is devoted to development of a method for control of lubricating properties of motor oil during service interval mileage for detecting optimal time of its change in an automobile. As automobiles have different operational conditions, it isn’t always necessary to follow recommendations of a manufacturing company concerning the period of changing motor oil in internal combustion engines. A most rational and economically justified method is a method of changing oil according to actual condition of operating liquids. The paper presents developed equipment - friction machine aimed at measuring lubricating properties of motor oils by the Timken method. The paper also describes a method of an experimental study. The authors have presented a measurement protocol of a wear scar of rollers in dependence with operating time of an automobile. Data analysis enables to conclude that lubricating properties decrease almost linearly and deteriorate nearly by 2 times with mileage increase. Moreover, for more detailed clarification of reasons of lubrication properties deterioration the authors have carried out a spectral analysis of motor oil and determined a concentration of wear products in crankcase oil. As a result, studies have confirmed a possibility of measuring lubricating properties for control of actual technical condition of motor oils in operation.
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