Determination of diagnostic errors in the system of diagnostic parameters of hydraulic drives of construction and road machinery

Abstract

Problem. The article considers the issue of increasing the efficiency of operation of construction machines by improving systems of measures that provide an effective system for diagnosing hydraulic drive elements. The considered existing methods prove that a more effective determination of indicators of diagnostic parameters in a system with the error of the diagnostic devices themselves for diagnosing hydraulic drives of construction and road machines will be the equipment that gives the necessary result with lower overall costs for diagnostics with minimal costs, including the cost of diagnostic equipment, its operation and development, as well as the cost of preparing the hydraulic drive for diagnosis. Goal. The goal is determination of diagnostic errors in the system of diagnostic parameters of hydraulic drives of construction and road machinery. Methodology In technical diagnostics, test and functional diagnostics are used. During functional diagnosis, actions are used that are set by the working processes of the hydraulic drive. During test diagnostics, special test actions are applied to hydraulic units. The technical condition of hydraulic units is evaluated based on the reaction to these actions. Functional and test actions, between which there are no clear boundaries, are carried out only within the technical characteristics of the hydraulic unit. Results. A more effective determination of the indicators of diagnostic parameters in a system with the error of the diagnostic devices themselves for diagnosing hydraulic drives of construction and road machines will be the equipment that gives the required result with lower overall costs for diagnostics. These costs include the cost of diagnostic equipment, its operation and development, as well as the cost of preparing the hydraulic drive for diagnosis. Originality. Accuracy in this case is determined by the analytical dependence that connects the diagnostic parameters and other methods depending on the type of this dependence. Thus, it was established that the use of a lower rotation frequency of the pump compared to its passport data increases the share of leaks in the total flow of the working fluid and allows to reduce the diagnostic error by 40...60% without additional costs for the purchase and operation of measuring devices. Changing the parameters is possible within the technical characteristics of the hydraulic unit. Methods of ensuring accuracy are currently insufficiently used to improve diagnostics, which is an unused reserve for increasing its efficiency. Practical value. Efficiency of operation of construction machines is increased by improving the systems of measures that provide an effective system for diagnosing hydraulic drive elements.