WAYS OF INCREASE IN RELIABILITY OF ESTIMATION OF TECHNICAL CONDITION OF SEPARATE CYLINDERS OF MULTICYLINDER DIESEL AND PETROL ENGINES

Abstract

Studying subject in article is possible ways of increase in reliability of estimation of technical condition of separate cylinders of multicylinder diesel and petrol engines. Degree of reliability of determination of the valid technical condition of military power plant depends on that as fully controlled parameters reflect actual state of a subject to control. Recommendations about increase in reliability of estimation of the general technical condition of diesel and petrol internal combustion engines of electrical units of military power plants when using as diagnostic parameters of efficiency or specific fuel consumption are provided. The main attention is paid to ways of estimation of technical condition of separate cylinders of multicylinder engines. It is offered at estimation of degree of unevenness of operation of cylinders of the engine as diagnostic parameter to use degree of unevenness of angular frequency of rotation of his shaft. Speaks properly to measure this size, it is specified that the reliability of results of measurements is influenced by tortional fluctuations of the elastic system "cranked shaft-tsilindro-piston group". Also for increase in reliability of results of diagnosing it is offered to consider influence of atmospheric conditions, such as atmospheric pressure, ambient temperature and relative humidity of air and also mechanical losses. Options of technical solutions which use will allow to eliminate influence of tortional fluctuations on results of diagnosing are given in article. It is determined that the effective means of taking into account torsional oscillations of the elastic system "crankshaft - cylinder-piston group" in determining the degree of unevenness of the rotational speed of a shaft is the use of a variable pulse generating frequency, by which they determine the rotational time of a shaft at a given angle, or determine the angle between flashes in adjacent cylinders with the help of an indicator of the moment of fuel injection into the engine cylinder and the sensor of the upper dead center.