Pressure Monitoring of Diesel Engine Crankcase Gases for Integrated Diagnostics

Author Name(s): Ilnur R. Akhmetzianov, Alexandr T. Kulakov, Damir I. Nuretdinov
Author Email: nuretddamir@yandex.ru

Abstract

The paper presents an analysis of methods for monitoring the flow and pressure of crankcase gases, a method for measuring the pressure of crankcase gases using the built-in diagnostic system. The authors investigated the prospects, advantages and disadvantages of the method of diagnosing an engine by the flow rate and pressure of crankcase gases, the algorithm for creating an integrated diagnostic system. Based on studies of measurement methods, a number of recommendations are proposed for its further improvement and the selection of modern measuring instruments. Improving the methods for diagnosing aggregates and units is one of the most important areas for ensuring their performance. Therefore, built-in diagnostics should be given special attention in the production and operation of transport-technological machines, which determines the relevance of this area of research. Determination of the technical condition of the units and components of the car by diagnostic parameters every day becomes relevant. Especially this problem concerns the reliability of automotive internal combustion engines, the state of which requires constant monitoring of technical parameters in operation. The article focuses more on technology and means for measuring crankcase pressure. The materials of the article are of practical value and can be used in the educational process of a technical university and at motor transport enterprises, scientific and technical centers, car repair plants. The development of a system for monitoring the technical condition of the engine is being carried out as part of the on-board diagnostics of production equipment of PJSC KAMAZ .

Introduction

One of the nodes that determine the reliability of the engine is a cylinder-piston group (CPG). Engine operation should be stopped immediately in the event of extreme wear on the CPG, especially if the rings break. Therefore, the task of accurately determining the degree of deterioration of the CPG during operation by diagnostic parameters is very relevant and avoids further consequences. In the field of assessing the technical condition of the engine using diagnostic parameters, as well as improving the methodology for their measurement, studies are being conducted by Russian and foreign scientists, which are presented in [2] – [9]. There are many ways to assess the technical condition of an engine. In bench conditions, engine torque, specific fuel consumption, oil consumption for burning, crankcase gas pressure, coolant temperature, oil pressure and temperature in the lubrication system, pressure and charge air temperature can be measured. Some of these parameters accurately assess the condition of the nodes, however, a system for measuring them is not integrated into the power unit.

Conclusion

The use of an integrated crankcase pressure monitoring system prevents engine failures associated with wear of the piston-cylinder group. Modern sensors with high accuracy allow you to monitor pressure changes during the operational period.

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