Impact of Engine Lubricant Volatility on Oil and  Particle Emissions

Lensch-Franzen, Christian; Gohl, Marcus; Scholl, Peter; Paoloni, Francois

doi:10.1007/s38313-019-0087-z

Cited by 2 publications

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“…The relevance of oil volatility for aerosol production, and hence of the oil temperature within an engine, especially of local extremes in so-called hot-spots, has already been pointed out [8]. However, the impact of key parameters such as HTHS viscosity and Noack volatility on aerosol production has never been investigated exhaustively.…”

Section: Introductionmentioning

confidence: 99%

Impact of engine oil volatility and viscosity on blow-by aerosol formation

Scheiber

Nowak

Lorenz

et al. 2022

Automot. Engine Technol.

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Particulate emissions from diesel engines are a matter of public concern and continued industrial development. For an internal combustion engine, particles may originate either from the after treatment box or from the crankcase ventilation system. This paper quantifies and discusses particle sources within the crankcase ventilation system of a medium-duty 4-cylinder and a heavy-duty 6-cylinder engine and their dependence on the engine oil parameters viscosity (expressed as Noack number) and HTHS volatility. Crankcase aerosol spectra were measured by an optical particle counter in the size range of 0.3–5 µm. For a few cases data of filter samples downstream the separator unit are discussed for the total blow-by aerosol. Engines were found to behave very similarly with regard to changes in either oil parameter, with volatility generally being the far stronger factor of influence. Total particle mass concentration increased by a factor of up to 5 for a rise in Noack volatility of about 13–25%. The mass concentration downstream of the separator also increases with oil volatility. A variation of HTHS viscosity from 3.5 to 2.6 mPas generated a marginal change in aerosol output by a factor of about 1.2. However, and unexpectedly, the most viscose oil generated the relatively highest particle mass concentrations for both engines.

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Section: Introductionmentioning

confidence: 99%

Impact of engine oil volatility and viscosity on blow-by aerosol formation

Scheiber

Nowak

Lorenz

et al. 2022

Automot. Engine Technol.

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Beyond Noack Volatility: New Perspective for Engine Lubricant Oil and Particle Emissions

Paoloni¹,

Burette²,

Gohl³

et al. 2020

SAE Int. J. Adv. & Curr. Prac. in Mobility

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<div class="section abstract"><div class="htmlview paragraph">Reduction of fuel consumption and pollutant emissions are key factors in the current development of powertrains. Engine oil has proven to be an efficient lever for improving fuel economy. The full potential of a low viscosity lubricant could be achieved by a shift towards formulations with low viscosity, high volatility base oils. However, there is a concern that this might increase oil consumption and limit long oil drain intervals.</div><div class="htmlview paragraph">This article deals with the engine lubricant contribution to oil and particle emissions. A series of 0W-12 oil prototypes have been evaluated both within laboratory measurements and on a modern turbocharged direct injection gasoline engine. Correlation between oil emission and engine oil properties will be presented.</div><div class="htmlview paragraph">The impact of engine oil on particle emissions has also been investigated under different engine operating conditions. A focus on particle size distribution demonstrates the relevance of transient driving conditions to the formation of unregulated emissions. Time-resolved measurement of a dynamic driving cycle provides a valuable insight to achieving additional emission reduction under real drive conditions.</div></div>

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Impact of Engine Lubricant Volatility on Oil and Particle Emissions

Cited by 2 publications

References 0 publications

Impact of engine oil volatility and viscosity on blow-by aerosol formation

Impact of engine oil volatility and viscosity on blow-by aerosol formation

Beyond Noack Volatility: New Perspective for Engine Lubricant Oil and Particle Emissions

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