Theoretical aspects of assessing the residual engine oil resource

Abstract

The article reflects issues related to changes in the properties of engine oil during operation. Proposals are considered for creating a methodology for assessing the residual resource of engine oil by the example of changing the kinematic viscosity. The operating conditions of cars vary greatly, which affects the change in the engine oil resource. Automotive manufacturers set the engine oil change interval in kilometers. The actual resource of the engine oil may differ significantly from that recommended by the manufacturer of the equipment and declared by the manufacturer of the oil. The article presents the factors that determine the resource of engine oil and theoretical aspects of assessing the residual resource of engine oil. To assess the residual life of the engine oil, it is proposed to select a diagnostic indicator that comprehensively evaluates the state of the operating oil, assign limit values for the diagnostic indicator, fix the values of the diagnostic indicator during daily maintenance of the car, replace the dependence by which the diagnostic indicator changes with an approximating straight line, determine the coefficients for the approximating direct based on the last and previous values of the diagnostic indicator and operating time, calculate the engine oil operating time to the limit state according to a linear relationship The results of testing and forecasting the residual resource of engine oil for a motor transport enterprise are presented. Calculations made it possible to establish that the frequency of engine oil change can be increased relative to that adopted at a motor transport company by 28.3%.