Improvement of diagnostics method of cylinder and piston groups of car engine
Journal Title: Вісник Житомирського державного технологічного університету. Серія: Технічні науки - Year 2018, Vol 82, Issue 2
Abstract
The paper presents the results of improving the process of diagnostics of the tightness of the combustion chamber of gasoline engines relative to modern cars. The statistical hypothesis about the normal distribution of a random variable of compression is proved. The regression equation is obtained for a random variable of compression depending on the engine speed. The regression model also takes into account the number of valves per cylinder. The model of the diagnosis of the technical condition of the engine, namely the tightness of the combustion chamber is formalized. The range of diagnostic parameters for assessing the tightness of the combustion chamber of a gasoline engine of modern models is determined. Experimental studies on cars of different European and Asian brands are performed. Using a strain gauge measurement method with subsequent analog-digital conversion of the signal, measurements of diagnostic parameters were use. Experimental data processing was carried out using mathematical statistics methods. Using the method of regression analysis, a correlation between the amount of compression and the frequency of rotation of the crankshaft was established; the method of tolerant limits set the limit for the allowable amount of compression; using the theoretical methods of analysis, synthesis, modeling and Boolean algebra, the diagnostic process is formalized. A statistical model has been developed on the basis of on the improvement of the diagnostic method, which evaluates the technical condition of the cylinder-piston group and the tightness of the engine valves according to three diagnostic parameters: the difference in compression between the cylinders, the rate of increase in compression, the pressure of crankcase gases. It allows localizing malfunction of the cylinder-piston group and the tightness of the engine valves, as well as formalize the process of automatic installation of technical diagnosis.
Authors and Affiliations
I. Y. Sarayeva, M. V. Milentyev
Keywords
Related Articles
- EP ID EP420442
- DOI -
- Views 107
- Downloads 0
Підвищення стійкості кінцевих фрез з покриттям під час обробки титанових сплавів за рахунок приробітки
Наведено результати дослідження можливості підвищення стійкості кінцевих фрез з покриттям при обробці титанових сплавів за рахунок приробітки. Для цього проаналізовано існуючі методи підвищення стійкості інструментальних...
Investigation of the influence of the metal excipient of the termite charge on the qualitative parameters of the alloy, deposited by the IMS method
For surfacing the coating on the surface of metal products, welding is usually used. This process is time-consuming, takes a lot of time and does not allow you to simultaneously receive connections across the entire prod...
Substantiation of enterprises’ personnel potential characteristics
Globalization and innovation processes, which cover all the spheres of society, change the conditions for human administration in socioeconomic processes, actualizing the researches in the field of substantiation of crit...
On the task of building the routes of passenger buses of two automobile companies
The article formulates a mathematical model search of n bus routes between the two points, which carry out cruises corresponding to the specified schedule, and with specified duration. The duration of each route consists...
Probabilistic-Stochastic Model of Distribution of Physical and Mechanical Properties of Soft Mineral Rocks
The physical and mechanical characteristics of soils and soft rocks obtained as a result of laboratory tests are important initial parameters for assessing the stability of natural and artificial slopes. Such properties...