The Effect of Viscosity and Friction Modifier on Fuel Economy and the Relationship Between Fuel Economy and Friction

Park, Seik; Cho, Yengun; Sung, Kwunsup; Han, Namgyu

doi:10.4271/2009-01-2662

Cited by 22 publications

(11 citation statements)

References 4 publications

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“…After some consideration, we decided to include a friction modifier of the molybdenum type (MoDTC) at a level of 700 ppm based on past studies. It was reported that a Mocontaining friction modifier has some potential in delivering improved fuel economy in low viscosity engine oils [14][15][16]. Following that, a series of SAE 0W-16 oils were formulated alongside the Mo-containing friction modifier and they are oil I, oil J, oil K and oil L. The main difference among these oils are the VII type included into their respective formulation.…”

Section: Study 2: Sae 0w-16mentioning

confidence: 99%

Contribution of Viscosity Index Improver to Fuel Economy

Inoue¹,

Tan

Hutchinson

et al. 2019

Tribology Online

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The demands on the automotive Industry to deliver improved fuel economy are long standing and continuing. A common and cost effective way to improve the fuel economy is to optimize the viscosity-temperature profile of a lubricating oil by employing a Viscosity Index Improver (VII). In this paper, we investigated the impact of the viscosity of engine lubricating oils on fuel economy and the influence of the VII in tuning the viscosity-temperature profile of the oil to maximize the fuel economy effect without compromising the protection under conditions of high temperature and high shear. We introduced novel comb type VIIs which have been specifically developed to provide the optimized viscosity-temperature profile required to give this balance. The way how these novel comb type VIIs were compared to more conventional VIIs in terms of the lubricating oil viscosity-temperature performance and also the resulting benefit in fuel economy are illustrated. We highlighted a recent study on a SAE 0W-16 oil, which is already of low viscosity, and further viscosity modification of what is already a quite efficient lubricating oil are less pronounced in terms of measurable influence on fuel economy.

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Section: Study 2: Sae 0w-16mentioning

confidence: 99%

Contribution of Viscosity Index Improver to Fuel Economy

Inoue¹,

Tan

Hutchinson

et al. 2019

Tribology Online

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“…Studies [3,4,5,6] carried out to evaluate fuel economy with the use of low-viscosity lubricants show that it is important to evaluate the capacity of this lubricant to avoid the momentary loss of viscosity when it is subjected to high temperatures and high shear rate. The result indicates the resistance that the fluid has to pass through regions with very strict tolerances, such as the moving and hot parts of an engine.…”

Section: Hths -High Temperature High Shearmentioning

confidence: 99%

“…However, to qualify and recommend the use of products in these new viscosity grades, the durability of the equipment must not be compromised in detriment of fuel consumption. The lubricant film is physically the component that avoid and protect the metal to metal contact between the piston from the ring as well the piston ring against the cylinder wall, therefore, it is necessary in this component an in-depth research of the physicochemical elements that influence the tribological conditions of metallic friction that occurs in the combustion engines as done in the works [3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Eficiência Energetica e os Óleos de Motor

Conconi¹,

Silva²,

Vercelino³

et al. 2019

Blucher Engineering Proceedings

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The need to reduce greenhouse gases (GHG) such as CO2, as well as other environmental contaminants caused by vehicle tailpipes, become fundamental for humanity. The combinations that driver to a significant fuel economy in the automotive segment are too complex and based on several physical, economical and technological factors, however in this work we tried to isolate the variables aiming to demonstrate only the influence of the viscosity grade from the lubricant used in the internal combustion engine (ICE). We performed tests on a popular vehicle, which is representative in the Brazilian market, powered by an 1,000 cm³ Otto engine, installed in a chassis dynamometer in an independent laboratory certified by INMETRO using the NBR 6601 and 7024 standards as reference, in urban and highway cycles, with engine oil in three different viscosities grades: SAE 5W-40, SAE 5W-30 and SAE 0W-20. To ensure only the viscosity change, these three fluids were blended with the same basic oil type and the same additive package, adjusting only the amount of viscosity modifier and the fractions of the base oils to meet the desired viscosity grade. The result showed that thinner oils reduce friction in the engine among its moving parts, reduce the pump losses and, therefore, an improvement on the fuel efficiency, as well as reduction in exhaust gas emissions. The results obtained in this study show that the fuel economy changing from a SAE 5W-40 oil to a SAE 5W-30 in this vehicle operating in this cycle was 0.91% and using the SAE 0W-20 fluid under the same conditions the reduction was 2.11%. The SAE 0W-20 viscosity grade proved a real benefit on hardware efficiency, helping on new environmental challenges and reducing the vehicle's operating cost to the end customer.

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“…During the cold start, the coolant fluid and lubricant oil are cold, therefore engines suffer higher friction and less efficient combustion resulting in higher fuel consumption and higher harmful emissions [6][7][8]. The viscosity of lubricant oil affects mechanical friction whereby at low temperature, the lubricant has high viscosity leading to increasing friction loss [9,10]. Coolant temperature needs to be high during cold start to increase engine temperature until it achieves normal operating temperature.…”

Section: Introductionmentioning

confidence: 99%

Simulation of bypass electric water pump to reduce the engine warm-up time

Jalal

Yusoff

Hasan

et al. 2021

JMES

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There are several strategies have been developed in the automotive cooling system to improve engine thermal management. Basically, these designs use controllable actuators and mechatronic components such as electric water pump, controllable thermostat, and controllable electric fan to improve engine temperature control on most operating ranges. Most of the strategies are complicated and costly. This paper introduced a different approach to improve coolant temperature warm-up during cold start. The new strategy was by promoting a higher coolant flow rate inside the engine block by just installing an electric water pump in the bypass hose. The new approach’s cold start performance was studied using GT-SUITE on a transient model, complete with finite-element of engine block design, lubrication system, components friction model, engine with combustion model and vehicle system. The proposed strategy clearly showed faster coolant temperature increase (18 seconds faster compared to the conventional cooling system). The strategy not only increase the coolant temperature faster, but also increases the oil temperature faster, lower Friction Mean Effective Pressure (FMEP), and lower fuel consumption at certain condition during the warm-up period.

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The Effect of Viscosity and Friction Modifier on Fuel Economy and the Relationship Between Fuel Economy and Friction

Cited by 22 publications

References 4 publications

Contribution of Viscosity Index Improver to Fuel Economy

Contribution of Viscosity Index Improver to Fuel Economy

Eficiência Energetica e os Óleos de Motor

Simulation of bypass electric water pump to reduce the engine warm-up time

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