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Mechanism of Turbocharger Coking in Gasoline Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 01, 2015 by SAE International in United States
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Turbocharged downsized gasoline engines have been widely used in the market as one of the measures to improve fuel economy. Coking phenomena in the lubricating circuit of the turbocharger unit is a well-known issue that may affect turbocharger efficiency and durability. Laboratory rig test such as ASTM D6335 (TEOST 33C) has been used to predict this phenomenon as a part of engine oil performance requirements. On the other hand, laboratory tests sometimes have difficulty reproducing the actual mechanism of coking caused by engine oil degradation. Accumulation of insoluble material is one of the important gasoline engine oil degradation modes. The influence of temperature and insoluble concentration were investigated based on actual used engine oils collected in the field.
CitationMiyata, I., Hirano, S., Tanada, M., and Fujimoto, K., "Mechanism of Turbocharger Coking in Gasoline Engines," SAE Technical Paper 2015-01-2029, 2015, https://doi.org/10.4271/2015-01-2029.
- Kawai T., Watanabe I., Yonezawa K., Ogawa T., The New Toyota 2.0-Liter Inline 4-Cylinder ESTEC D-4ST Engine - Turbocharged Direct Injection Gasoline Engine -, 4th Aachen Colloquium China Automobile and Engine Technology 2014, (2014)
- Yoshida, S. and Naitoh, Y., “Analysis of Deposit Formation Mechanism on TEOST 33C by Engine Oil Containing MoDTC,” SAE Int. J. Fuels Lubr. 1(1):1534-1539, 2009, doi:10.4271/2008-01-2480.
- Galliard I. R., Lillywhite J. R. F., Field Trial to Investigate the Effect of Fuel Composition and Fuel-Lubricant Interaction on Sludge Formation in Gasoline Engines, SAE Technical Paper, 922218, (1992)
- Vineyard B.D. and Corn A.Y. : ACS Div. Petrol. Chem. Properties, 14, 4, (1969) A-25, A-35
- Ikeda J., Hayakawa N., Konohara H., Development of Ventilation System for ESTEC D-4ST, 162-20145843, 2014 JSAE Annual Congress(Autumn), (2014)