This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Research on Ultra-High Viscosity Index Engine Oil: Part 2 - Influence of Engine Oil Evaporation Characteristics on Oil Consumption of Internal Combustion Engines
Technical Paper
2022-01-0524
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The reduction of CO2 emissions is one of the most important challenges for the automotive industry to contribute to address global warming. Reducing friction of internal combustion engines (ICEs) is one effective countermeasure to realize this objective. The improvement of engine oil can contribute to reduce fuel consumption by reducing friction between engine parts.
Electrification of ICE powertrains increases the overall efficiency of powertrains and reduces the average engine oil temperature during vehicle operation, due to intermittent engine operation. An effective way of reducing engine friction is to lower the viscosity of the engine oil in the low to medium temperature range. This can be accomplished while maintaining viscosity at high temperatures by reducing the base oil viscosity and increasing the viscosity modifier (VM) content to raise the viscosity index (so-called “flat viscosity” concept). However, reducing the base oil viscosity increases volatility loss and may cause an increase in oil consumption as a trade-off effect.
ASTM D5800 (NOACK test) has been utilized as an industry standard test since the 1930s to measure the evaporative loss of engine oils related to evaporative oil consumption. However, some reports indicate that standard NOACK does not correlate well with actual engine oil consumption. A new evaporative index with better correlation is necessary for further engine oil technology development.
This study investigated which physical properties of engine oil can express the evaporation rate related to evaporative engine oil consumption in actual engines. As a result, a modified NOACK test at 150°C, which is in the temperature range of the cylinder bore, showed good correlation with evaporative oil consumption in actual engine operation. This modified NOACK test has potential as a new evaporative index to realize new concept oils with flat viscosity properties.
Authors
Citation
Koyama, T., Suzuki, T., Yamamori, K., Uematsu, Y. et al., "Research on Ultra-High Viscosity Index Engine Oil: Part 2 - Influence of Engine Oil Evaporation Characteristics on Oil Consumption of Internal Combustion Engines," SAE Technical Paper 2022-01-0524, 2022.Also In
References
- IEA 2017
- Uematsu , U. , Yamamori , K. , Hirano , S. , Miyata , I. et al. Examination of Fuel Economy Improvement with Ultra-High Viscosity Index of Engine Oil Proceedings of the 2020 JSAE Annual Congress (Spring) 2020
- Sawaumi , K. and Naoi , Y. Study of Oil Consumption in Small-Displacement 4-Stroke Air-Cooled Engines Honda R&D Technical Review 23 1 2011 62 69 (in Japanese)
- Yilmaz , E. , Tian , T. , Wong , V.W. , and Heywood , J.B. The Contribution of Different Oil Consumption Sources to Total Oil Consumption in a Spark Ignition Engine SAE Technical Paper 2004-01-2909 2004 https://doi.org/10.4271/2004-01-2909
- Harigaya , Y. , Kodaira , S. , and Suzuki , M. Study on Lubricating Oil Evaporation on Cylinder Liner Wall of an Engine: Effect of Heat Transfer Coefficient in Combustion Chamber Bulletin of the Faculty of Education, Utsunomiya University. Section 2 58 2008 31 40 (in Japanese)
- Inagaki , H. and Konomi , T. Effect of Cylinder Wall Oil film Thickness on Oil Consumption in Internal Combustion Engine Transactions of the Japan Society of Mechanical Engineers Series B 70 700 2004 3251 3256 (in Japanese)
- De Petris , C. , Giglio , V. , and Police , G. A Mathematical Model of the Evaporation of the Oil Film Deposed on the Cylinder Surface of IC Engines SAE Technical Paper 972920 1997 https://doi.org/10.4271/972920
- Soejima , M. , Harigaya , Y. , Hamatake , T. , and Wakuri , Y. Study on Lubricating Oil Consumption from Evaporation of Oil-Film on Cylinder Wall for Diesel Engine SAE Int. J. Fuels Lubr. 10 2 2017 487 501 10.4271/2017-01-0883
- Zhang , Q. , Tian , T. , and Koeser , P. A One-Line Correlation for Predicting Oil Vaporization from Liner for IC Engines SAE Technical Paper 2018-01-0162 2018 https://doi.org/10.4271/2018-01-0162
- Suzuki , T. , Koyama , T. , Yamamori , K. , Uematsu , Y. et al. Influence of Engine Oil Evaporation Characteristics on Oil Consumption of Internal Combustion Engines Proceedings of the 2021 JSAE Annual Congress (Spring) 2021
- Yamamoto , M. and Noda , T. Measurements for Tribology in Automobile Engines R&D Review of Toyota CRDL 28 1 1993 3 (in Japanese)
- Toyomasu , T. 2017
- Woschni , G. Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in Internal Combustion Engine SAE Technical Paper 670931 1967 https://doi.org/10.4271/670931