Method for expert evaluation of the technical con-dition of the cylinder-piston group of automotive engines after hydrolock




cold cranking, cold start, compression, hydrolock, modeling


Problem: The study examines the thermogasdynamic process within an internal combustion engine cylinder during cold cranking mode while measuring compression. Analysis of various models and comparison of known data revealed unresolved challenges in constructing mathematical models of the engine operating cycle. The vast majority of practical data and recommendations for compression measurement in a cylinder are based on empirical knowledge, numerous experiments, and tests. Consequently, there arises a need for computational models of the compression measurement process and their theoretical justification, particularly in cases where engine damage occurs during hydrolock in a cylinder. Methodology. To address the identified issues, a mathematical model of the thermogasdynamic process within the cylinder during cold cranking while measuring compression was developed. Originality. Unlike existing models, this model describes the processes in the cylinder step by step, considering the real nature of intake-exhaust processes, air leakage through part interfaces, and heat exchange with the walls. Through modeling, the main patterns of compression changes depending on the modes and the nature of damage to associated parts of the valve mechanism and the cylinder-piston group were identified, including deformation of the connecting rod during hydraulic lock due to liquid entering the cylinder. Practical value. Based on the study results, it was concluded that the model's properties make it effectively applicable in diagnosing and monitoring the technical condition of automotive engines during operation.

Author Biographies

Alexander Khrulev, International Motor Bureau, Shkilna str., 15, Nemishaeve, Kyiv region, 07853, Ukraine

Ph.D., Senior Researcher, forensic expert

Olexii Saraiev, Kharkiv National Automobile and Highway University,25, Yaroslava Mudrogo str., Kharkiv, Ukraine, 61002

Doctor of Technical Sciences, Professor

Department of Cars

Irina Saraieva, Kharkiv National Automobile and Highway University, 25, Yaroslava Mudrogo str., Kharkiv, 61002, Ukraine

Ph.D., Assoc. Professor


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How to Cite

Khrulev, A., Saraiev, O., & Saraieva, I. (2024). Method for expert evaluation of the technical con-dition of the cylinder-piston group of automotive engines after hydrolock. Vehicle and Electronics. Innovative Technologies, (25), 63–70.