Evaluation of Low Viscosity Engine Wear Effects and Oil Performance in Heavy Duty Engines Fleet Test

Macián, Vicente; Tormos, Bernardo; Ruíz, Santiago; Mezquita, Guillermo Miró; Pérez, Tomás A.

doi:10.4271/2014-01-2797

Cited by 11 publications

(5 citation statements)

References 21 publications

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“…A complementary work related with oil analysis published previously has shown divergence in oil viscosity trends among the bus models (Macian et al, 2014); however, the ANOVA results show a significant decrease in fuel consumption as the oil mileage increases, being lower at the end of the ODI. Since this trend has no correlation with the oil properties under study it is not possible to give any robust condition and a deeper study should be done in the future.…”

Section: Additional Considerationsmentioning

confidence: 87%

Potential of low viscosity oils to reduce CO2 emissions and fuel consumption of urban buses fleets

Macián

Tormos

Ruíz

et al. 2015

Transportation Research Part D: Transport and Environment

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a b s t r a c tThis paper shows the results of a comparative fleet test the main objective of which was to measure the influence of Low Viscosity Oils (LVO) over the fuel consumption and CO 2 emissions of urban buses. To perform this test, 39 urban buses, classified into candidate and reference groups depending on the engine oil viscosity, covered a 60,000 km mileage corresponding to two rounds of standard Oil Drain Interval (ODI). In the same way, for 9 buses of the 39 buses, the effect of differential LVO over fuel consumption and their interaction with engine LVO was assessed during the second ODI.Test results confirm that the use of LVO could reduce fuel consumption, hence CO 2 emissions. However, special attention should be taken prior to its implementation in a fleet, particularly if the vehicles are powered by engines with high mechanical and thermal stresses during vehicle operation because this could lead to friction loss increase, loss of the potential fuel consumption reduction of LVO and, in the worst scenario, higher rates of engine wear.Ó 2015 Elsevier Ltd. All rights reserved. IntroductionNowadays research and development departments of road transportation OEMs are focused on CO 2 emission reduction, following the global trend of industry to tackle the Global Warming. This concern has been traduced in CO 2 emission standards in a vast number of industrialized countries. Although these regulations have been set for light duty passenger cars initially, the oncoming trend is to embrace Heavy Duty Vehicles (HDV) as well. It has to be mentioned that research in the HDV segment during the last years has been dedicated to reduce pollutant emissions, especially CO, NO x and particulate matter; this trend is evident when the progression limits of the Euro emission standards are analyzed (European Commission, 2014). For the above stated reasons, to reduce CO 2 emissions has become an important matter for the road transportation segment and, even when the number of HDV is small compared to the number of passenger vehicles, their share in the total amount of CO 2 emissions is remarkable. Getting deeper on this topic, Holmberg et al. (2014) have plotted that from the total energy used in transportation, nearly 73% corresponds to the road segment and of it 36% corresponds to HDV, making this segment a key target where an improvement in efficiency could lead to appreciable energy savings. Among many others, one interesting and specific type of HDV is the urban bus, in which energy shares are about 4% of the transportation sector. Some interesting characteristics of this type of vehicles are pointed out by Holmberg as well; they rely on diesel fuel due to the extended use of ICE, they have a repetitive duty cycle which leads to homogeneous energy http://dx.

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Section: Additional Considerationsmentioning

confidence: 87%

Potential of low viscosity oils to reduce CO2 emissions and fuel consumption of urban buses fleets

Macián

Tormos

Ruíz

et al. 2015

Transportation Research Part D: Transport and Environment

Self Cite

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“…Compared with high viscosity lubricant, low viscosity lubricant is more excellent in oil fluidity and fuel consumption (Macian et al, 2014). However, the lubricant viscosity is too low, which leads to the decrease of the oil film bearing capacity, especially for the heavy-duty diesel engine, which may lead to lubrication risks (Rejowski Edney et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Adaptability of piston skirt coatings on the tribological performance of heavy-duty diesel engine under low viscosity lubricant

Yin

Wang

et al. 2021

ILT

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Purpose The purpose of this paper was to improve the frictional wear resistance properties of piston skirts caused by the low viscosity lubricant by studying the tribological performance of three novel coating materials. Design/methodology/approach Comparative tribological examinations were performed in a tribological tester using the ring-block arrangement under two viscosity lubricants, the loading force was applied as 100 N, the speed was set to 60 r/min and the testing time was 180 min. Findings Under low viscosity lubricant, the friction coefficient and wear of the three coatings all increase, and the friction coefficient and wear of the PTFE coating are the largest, while the MoS2 coating has the lowest friction coefficient and wear. Under low viscosity lubricant, the friction coefficient of the MoS2 coating is 2.1%–5.4% and 20.0%–24.3% lower than that of the SiO2 and PTFE coating, respectively. The friction coefficient and wear fluctuation rate of the MoS2 coating is the smallest when the lubricant viscosity decreases, which indicates that the MoS2 coating has excellent stability and adaptability under low viscosity lubricant. Originality/value To reduce the piston skirt wear caused by low viscosity lubricant in heavy-duty diesel engines, the friction and wear adaptability of three novel composite coating materials for piston skirts were compared under 0 W-20 low viscosity lubricant, which could provide a guidance for the application of wear-resistant materials for heavy-duty diesel engine piston skirt.

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“…[3][4][5] But decreasing the thickness of the oil film significantly enhances engine wear, and this is made worse by the increasing engine operating pressures. 4,6 In order to improve engine lubricant formulations -to meet strict international emission standards, as well as to improve the wear protection -it is crucial to have a thorough understanding of the behaviour of lubricants over the range of conditions typically found in engines.…”

Section: Introductionmentioning

confidence: 99%

“…Even from the experimental point of view, it is useful to focus on pure compounds, so that the composition and properties are well-controlled and repro- ducible. Squalane (2,6,10,15,19,23-hexamethyltetracosane, C 30 H 62 ) 14 is widely used as a model compound to represent the fully-saturated long-chain hydrocarbons in base oils. The molecular structure is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Experimental and simulation study of the high-pressure behavior of squalane and poly-α-olefins

Prentice

Liu

Nerushev

et al. 2020

The Journal of Chemical Physics

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The equation of state, dynamical properties, and molecular-scale structure of squalane and mixtures of poly-α-olefins at room temperature are studied with a combination of state-of-the-art, high-pressure experiments and moleculardynamics simulations. Diamond-anvil cell experiments indicate that both materials are non-hydrostatic media at pressures above ∼ 1 GPa. The equation of state does not exhibit any sign of a first-order phase transition. High-pressure Xray diffraction experiments on squalane show that there are no Bragg peaks, and hence the apparent solidification occurs without crystallization. These observations are complemented by a survey of the equation of state and dynamical properties using simulations. The results show that molecular diffusion is essentially arrested above about 1 GPa, which supports the hypothesis that the samples are kinetically trapped in metastable amorphous-solid states. The shear viscosity becomes extremely large at very high pressures, and the coefficient governing its increase from ambient pressure is in good agreement with the available literature data. Finally, simulated radial distribution functions are used to explore the evolution of the molecular-scale structure with increasing pressure. Subtle changes in the shortrange real-space correlations are related to a collapse of the molecular conformations with increasing pressure, while the evolution of the static structure factor shows excellent correlation with the available X-ray diffraction data. These results are of indirect relevance to oil-based lubricants, as the pressures involved are comparable to those found in engines, and hence the ability of lubricating thin films to act as load-bearing media can be linked to the solidification phenomena studied in this work.

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Evaluation of Low Viscosity Engine Wear Effects and Oil Performance in Heavy Duty Engines Fleet Test

Cited by 11 publications

References 21 publications

Potential of low viscosity oils to reduce CO2 emissions and fuel consumption of urban buses fleets

Potential of low viscosity oils to reduce CO2 emissions and fuel consumption of urban buses fleets

Adaptability of piston skirt coatings on the tribological performance of heavy-duty diesel engine under low viscosity lubricant

Experimental and simulation study of the high-pressure behavior of squalane and poly-α-olefins

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