Oil Dilution Model for Combustion Engines - Detection of Fuel Accumulation and Evaporation

Lenk, Jan-Richard; Meyer, Lars Skjelbred; Provase, Ivan Sanches

doi:10.4271/2014-36-0170

Cited by 4 publications

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the fuel is not completely burned off during combustion, it can pass down (to the crankcase) by blow-by, mixing with the engine oil [18]. Another way that can generate fuel dilution [25] is when fuel droplets condensed at the cooler parts of the combustion chamber leak trough the piston rings and they fuse with the bulk engine oil in the crankcase [26]. A major problem of the fuel dilution is that it provokes the lubricant breakdown [27,28].…”

Section: Introductionmentioning

confidence: 99%

Study of the influence of emission control strategies on the soot content and fuel dilution in engine oil

Tormos

Novella

Gómez-Soriano

et al. 2019

Tribology International

View full text Add to dashboard Cite

The engine oil contamination by both particulate matter (PM) and fuel is becoming an important problem since strategies to control pollutant emissions in internal combustion engines (ICE) significantly increase their presence in engine oil. As a consequence, the engine oil loses its tribological properties compromising engine lubrication and leading to potential problems in engine such as wear, corrosion, etc. For that reason, the study of the oil degradation and contamination due to these strategies have a special interest to the engine manufacturers and engine oil formulators. In this paper, the engine oil soot content and fuel dilution is analysed under real engine conditions. The study is addressed from two different but complementary points of views. First, on-line measurements at several engine operating conditions are performed in order to further understand how the soot generation correlates with the oil soot content and other derived problems on oil performance. Then, experimental data available after the experimental campaign is used to calibrate a numerical model, based on Computational Fluid Dynamics (CFD), that estimate the amount of soot particles settled in the engine oil. Results show that soot particles are more present in oil when operating high load-speed conditions and during the Diesel Particulate Filter (DPF) regeneration cycles. Regarding the fuel dilution, delayed post-injections are critical since they significantly increase the amount of fuel in the engine oil. Numerical results also show the relationships between the soot particles generated during combustion and the amount of soot in engine oil, giving an enhanced comprehension of soot-in-oil deposition mechanisms.

show abstract

Section: Introductionmentioning

confidence: 99%

Study of the influence of emission control strategies on the soot content and fuel dilution in engine oil

Tormos

Novella

Gómez-Soriano

et al. 2019

Tribology International

View full text Add to dashboard Cite

show abstract

Study of the Relationship between the Level of Lubricating Oil Contamination with Distillation Fuel and the Risk of Explosion in the Crankcase of a Marine Trunk Type Engine

Chybowski

2023

Energies

View full text Add to dashboard Cite

Fuel contamination of engine lubricating oil has been previously determined to arise from two independent phenomena: the effect on oil flash point, and the effect of changing lubrication conditions on tribological pairs. This paper combines these effects and holistically analyzes the consequences of fuel in the lubricating oil of a trunk piston engine on the risk of crankcase explosion. The author hypothesized that diesel fuel as an oil contaminant increases the risk of an explosion in the crankcase of an engine due to the independent interaction of two factors: (1) changes in the oil’s combustible properties, and (2) deterioration of the lubrication conditions of the engine’s tribological nodes, such as main bearings, piston pins, or crank bearings. An experiment was performed to evaluate the rheological, ignition, and lubrication properties of two oils (SAE 30 and SAE 40) commonly used for the recirculation lubrication of marine trunk piston engines for different levels of diesel contamination. The hypothesis was partially confirmed, and the results show that contamination of the lubricating oil with diesel fuel in an amount of no more than 10% does not significantly affect the risk of explosion in the crankcase. However, diesel concentrations above 10% call for corrective action because the viscosity index, lubricity, coefficient of friction and oil film resistance change significantly. Deterioration of the tribological conditions of the engine bearings, as seen in the change in viscosity, viscosity index, and lubricity of the oil, causes an increase in bearing temperature and the possibility of hot spots leading to crankcase explosion.

show abstract

Turbocharged Flex Fuel Vehicles with Virtual Ethanol Content Identification

Souza

Carvalho

Bertolucci

2017

SAE Technical Paper Series

View full text Add to dashboard Cite

Oil Dilution Model for Combustion Engines - Detection of Fuel Accumulation and Evaporation

Cited by 4 publications

References 3 publications

Study of the influence of emission control strategies on the soot content and fuel dilution in engine oil

Study of the influence of emission control strategies on the soot content and fuel dilution in engine oil

Study of the Relationship between the Level of Lubricating Oil Contamination with Distillation Fuel and the Risk of Explosion in the Crankcase of a Marine Trunk Type Engine

Turbocharged Flex Fuel Vehicles with Virtual Ethanol Content Identification

Contact Info

Product

Resources

About