The effect of the power plant engine temperature on the amount of current consumed by the starter when diagnosing a bulldozer

Introduction. This article presents a methodology for conducting experiments as well as their results which show the relationbetween the signal range magnitude of the current consumed and the rate of increase in engine oil pressure, the coolant temperature of a power plant diesel engine operating at low temperatures. The relevance of this study is determined by the need to reduce the complexity and time of technical diagnostics of construction equipment, in particular a bulldozer, which is of special importance in the field conditions of the Far North. Current consumption studies have been focused onpositive temperature ranges (from 40 to 90 degrees Celsius). According to the authors’observations,when the ambient temperature changes, the diagnostic parameter under study (the amount of current consumed) is characterized by instability, reading ambiguity and requires correction. The need to warm up the diesel engine of the power pack increases the waiting time necessary for diagnostics. Starting failures of a power pack internal combustion engine lead to the violation of conditions for leak tightness diagnostics of the space above a piston by measuring the amount of current consumed. Therefore, the aim of the study is to determine relationship between the amount of current consumed by the starter and the rate of increase in engine oil pressure, the coolant temperature of a power pack diesel engine operating at low temperatures.

Materials and methods. This section presents the methodology and the results of the experiments. The experiments were carried out with a 6-cylinderdieselinlineengine of the power pack of the Shantui SD 22 bulldozer in the field conditions at subzero temperatures.

Results. Based on the analysis of experimental data, mathematical dependences were constructed between the magnitude of the signal range of the current consumed by the power pack engine and the rate of increase in engine oil pressure, and the coolant temperature.

Discussion and conclusion. Expanding of the functionality of the relative compression method reduces labor content of diagnostic operations included in maintenance No.3(which is carried out every thousand operating hours) for Komatsu D-355A bulldozer by 8%,and labor content of diagnosing the diesel engine power pack itself is reduced by17%.The research undertaken makes it possible to introduce correction coefficients and thereby to ensure the specified measurement accuracy and the reduced complexity and time,toimprove the controllability of technical diagnostics of power plant diesel enginesin construction machinery.

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