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Modeling of Oil Transport between Piston Skirt and Cylinder Liner in Internal Combustion Engines

Journal Article
2019-01-0590
ISSN: 2641-9637, e-ISSN: 2641-9645
Published April 02, 2019 by SAE International in United States
Modeling of Oil Transport between Piston Skirt and Cylinder Liner in Internal Combustion Engines
Sector:
Citation: Meng, Z., Ahling, S., and Tian, T., "Modeling of Oil Transport between Piston Skirt and Cylinder Liner in Internal Combustion Engines," SAE Int. J. Adv. & Curr. Prac. in Mobility 1(3):1158-1168, 2019, https://doi.org/10.4271/2019-01-0590.
Language: English

Abstract:

The distribution of lubricating oil plays a critical role in determining the friction between piston skirt and cylinder liner, which is one of the major contributors to the total friction loss in internal combustion engines. In this work, based upon the experimental observation an existing model for the piston secondary motion and skirt lubrication was improved with a physics-based model describing the oil film separation from full film to partial film. Then the model was applied to a modern turbo-charged SI engine. The piston-skirt FMEP predicted by the model decreased with larger installation clearance, which was also observed from the measurements using IMEP method at the rated. It was found that the main period of the cycle exhibiting friction reduction is in the expansion stroke when the skirt only contacts the thrust side for all tested installation clearances. The main reason for lower skirt friction with larger clearance is greater amount of oil available during the expansion stroke.