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Comparison of the results of determining the moment of mechanical losses obtained using various methods

Abstract

The work was carried out in order to confirm the equivalence of the value of the moment of mechanical losses obtained in free acceleration modes to the results of bench tests. The study was carried out as part of the development of a technique for indirect indexing – calculating gas forces and their operation based on an analysis of the dynamics of crankshaft rotation. Indirect indexing is important for monitoring the operation of the internal combustion engine in a car during its operation and can be implemented as an additional algorithm of the electronic control unit or an external electronic module operating based on the signal of the crankshaft position sensor and information received from the CAN bus. The proposed empirical method for determining the moment of mechanical losses is based on calculating the work of the resistance forces over a certain angular interval, as the difference between the work of the gas forces and the change in kinetic energy of the moving parts of the engine during its operation at various idle modes – free acceleration and run-off at different positions of the engine control. The angular velocity and position of the crankshaft are determined based on the signal processing of the standard crankshaft position sensor, and the operation of the gas forces is based on the results of direct indexing. The verification of the readings of pressure sensors in the cylinder is described. It was performed by turning off the cylinders of the engine running on the engine stand. The article also discusses a technique for determining the moment of inertia of rotating engine parts at unstable idle. The determination of the moment of inertia is necessary to calculate the kinetic energy of the moving parts of the engine. The analysis of experimental data confirming the equivalence of the moment of mechanical losses in stationary and transient modes is performed.

This article contains a description and results of motor tests conducted as part of the experiment. An analysis of experimental data has been carried out, confirming the equivalence of the moment of mechanical losses in stationary and transient modes.

About the Authors

Timofey V. Morozkin
MADI
Russian Federation

postgraduate



Anton V. Alexandrov
MADI
Russian Federation

Candidate of Sciences (Technical), associate professor



Ivan A. Dolgov
MADI
Russian Federation

Candidate of Sciences (Technical), engineer



Sergey E. Nikolaev
MADI
Russian Federation

engineer,



Dmitry S. Konyushkov
MADI
Russian Federation

head of the laboratory



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Review

Рецензент: А.Ю. Дунин, д-р техн. наук, доц., МАДИ

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ISSN 2409-7217 (Online)