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

Paoloni, Francois; Burette, Gautier; Gohl, Marcus; Lensch-Franzen, Christian; Holzmüller, Jan

doi:10.4271/2020-01-2161

Cited by 2 publications

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

The Flow of Lubricant as a Mist in the Piston Assembly and Crankcase of a Fired Gasoline Engine: The Effect of Viscosity Modifier and the Link to Lubricant Degradation

Dyson,

Priest,

Lee

2024

Tribol Lett

View full text Add to dashboard Cite

Droplet flows, termed misting, are significant lubrication flow mechanisms to, in and around the piston assembly. Therefore, these are important in piston assembly tribology and engine performance. Crankcase lubricant degradation rate has been hypothesised to be influenced by lubricant droplet flows through the piston assembly and crankcase, but not previously confirmed. Lubricant was sampled from the sump, top ring zone (TRZ), and mist and aerosol from the crankcase during an extended run. The physical and chemical degradation of these samples was characterised. Droplet flows were intermediate in degradation and fuel dilution between TRZ and sump. Flows with smaller droplet sizes were more degraded that those with larger droplets. The degradation of polymers was dependent on their molecular architecture.

show abstract

The Flow of Lubricant as a Mist in the Piston Assembly and Crankcase of a Fired Gasoline Engine: The Effect of Viscosity Modifier and the Link to Lubricant Degradation

Dyson,

Priest,

Lee

2024

Tribol Lett

View full text Add to dashboard Cite

show abstract

Correlation of Oil Originating Particle Emissions and Knock in a PFI HD SI Engine Fueled with Methanol

Ainouz,

Adlercreutz,

Cronhjort

et al. 2023

SAE Technical Paper Series

View full text Add to dashboard Cite

<div class="section abstract"><div class="htmlview paragraph">A viable option to reduce global warming related to internal combustion engines is to use renewable fuels, for example methanol. However, the risk of knocking combustion limits the achievable efficiency of SI engines. Hence, most high load operation is run at sub-optimal conditions to suppress knock. Normally the fuel is a limiting factor, however when running on high octane fuels such as methanol, other factors also become important. For example, oil droplets entering the combustion chamber have the possibility to locally impact both temperature and chemical composition. This may create spots with reduced octane number, hence making the engine more prone to knock. Previous research has confirmed a connection between oil droplets in the combustion chamber and knock. Furthermore, previous research has confirmed a connection between oil droplets in the combustion chamber and exhaust particle emissions. However, the co-variation between oil originating particle emissions and knock has not been investigated. The current study examines the connection between knock and particle number in the exhaust, when running on fuel with low soot production. A single cylinder spark ignited heavy-duty engine was used. It was equipped with port fuel injection and fueled with methanol, which produces very little soot at lambda 1. Consequently, the measured exhaust particle numbers were assumed to origin essentially from engine oil. Three grades of oil, in combination with three piston ring configurations, were used to vary the amount of oil entering the combustion chamber. Results from knock limited operation at both medium and high engine load showed that an increased number of particles in the exhaust was associated with an increased likelihood of knock. The authors find the hypothesis that an increase in particle number correlates with an increase in auto-ignition tendency to be confirmed.</div></div>

show abstract

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

Cited by 2 publications

References 15 publications

The Flow of Lubricant as a Mist in the Piston Assembly and Crankcase of a Fired Gasoline Engine: The Effect of Viscosity Modifier and the Link to Lubricant Degradation

The Flow of Lubricant as a Mist in the Piston Assembly and Crankcase of a Fired Gasoline Engine: The Effect of Viscosity Modifier and the Link to Lubricant Degradation

Correlation of Oil Originating Particle Emissions and Knock in a PFI HD SI Engine Fueled with Methanol

Contact Info

Product

Resources

About