Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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An Experimental Study on Characteristics of Engine Oil Diluted by a Bio-Alcohol Mixture Fuel

바이오알코올 혼합연료의 엔진오일 희석특성에 대한 실험적 연구

  • Kim, HyunJun (Gas Engine System R&D Center, Korea Automotive Technology Institute (KATECH)) ;
  • Lee, HoKil (Gas Engine System R&D Center, Korea Automotive Technology Institute (KATECH)) ;
  • Oh, SeDoo (Gas Engine System R&D Center, Korea Automotive Technology Institute (KATECH)) ;
  • Kim, Shin (Research Institute of Petroleum Technology, Korea Institute of Petroleum Management (K-Petro))
  • 김현준 (자동차부품연구원 가스엔진기술연구센터) ;
  • 이호길 (자동차부품연구원 가스엔진기술연구센터) ;
  • 오세두 (자동차부품연구원 가스엔진기술연구센터) ;
  • 김신 (한국석유관리원 석유기술연구소)
  • Received : 2016.09.14
  • Accepted : 2016.11.07
  • Published : 2016.12.31
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Abstract

Engine oil plays an important role in the mechanical lubrication and cooling of a vehicle engine. Recently, engine development has focused on the adoption of gasoline direct injection (GDI) and turbocharging methodology to achieve high-power and high-speed performance. However, oil dilution is a problem for GDI engines. Oil dilution occurs owing to high-pressure fuel injection into the combustion chamber when the engine is cold. The chemical components of engine oil are currently developed to accommodate gasoline fuel; however, bio-alcohol mixtures have become a recent trend in fuel development. Bio-alcohol fuels are alternatives to fossil fuels that can reduce vehicle emissions levels and greenhouse gas pollution. Therefore, the chemical components of engine oil should be improved to accommodate bio-alcohol fuels. This study employs a 2.0 L turbo-gas direct injection (T-GDI) engine in an experiment that dilutes oil with fuel. The experiment utilizes a variety of fuels, including sub-octane gasoline fuel (E0) and a bio-alcohol fuel mixture (Ethanol E3~E7). The results show that the lowest amount of oil dilution occurs when using E3 fuel. Analyzing the diluted engine oil by measuring density and moisture with respect to kinematic viscosity shows that the lowest values of these parameters occur when testing E3 fuel. The reason is confirmed to influence the vapor pressure of the low concentration bio-alcohol-fuel mixture.

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References

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