Automotive Fuel Savings Through Selected Lubricants

Chamberlin, William B.; Sheahan, Thomas J.

doi:10.4271/750377

Cited by 21 publications

(3 citation statements)

References 9 publications

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“…It has been proven in literature that similar friction data is acquired when comparing motored and fired engine tests [13]. An advantage of motored tests is that engine friction losses can be isolated from other non-tribological related phenomena and resolved into different operating systems, targeting the systems that account for most of the losses for every lubricant formulation [14]. The main drawback of this strategy is neglecting the effect of the combustion gases, the high cylinder pressure, and unburned fuel in the engine oil performance [15,16], which especially affects the sludge production and the durability of the oil [17].…”

Section: Introductionmentioning

confidence: 99%

The role of MoDTC tribochemistry in engine tribology performance. A Raman microscopy investigation

Espejo

Wang

Thiébaut³

et al. 2020

Tribology International

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Section: Introductionmentioning

confidence: 99%

The role of MoDTC tribochemistry in engine tribology performance. A Raman microscopy investigation

Espejo

Wang

Thiébaut³

et al. 2020

Tribology International

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“…Bartz [4,5] reported that ideally up to 6.3 per cent improvement can be realized by the use of lower viscosity multigrade gear lubricants containing friction modifiers. Chamberlain and Sheahan [6] noted significant fuel savings under cold startup conditions using multigrade gear lubricants. Also, axle efficiency tests at 40 to 70 mph suggest a maximum of 1.8 per cent improvement can be attained in torque efficiency using multigrade lubricants.…”

Section: Literature Reviewmentioning

confidence: 99%

Fuel economy of multigrade gear lubricants

Bala¹,

Brandt²,

Walters³

2000

Industrial Lubrication and Tribology

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The paper discusses the setup of a light duty axle efficiency test in evaluating gear lubricants for their fuel economy performance. Data collected with an internal reference oil highlight the repeatability of the test in different axles. Comparisons between single grade SAE 90 to multigrade gear lubricants were made under a variety of pinion torques and speeds to simulate highway and city driving conditions. A discussion of lubricant rheology and its importance to maintaining film strength for adequate bearing and gear lubrication for optimum torque efficiency and axle temperature is provided.

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“…1 The effect of oil rheology on both TE and OT has been extensively studied. [2][3][4][5][6][7][8][9][10][11][12][13][14][15] Bartz and Wienecke have reported that lower viscosity gear oils can increase fuel savings by as much as 7.5%. [3][4][5] They attribute this fuel economy improvement to reductions in oil's effective viscosity in fluid films.…”

Section: Introductionmentioning

confidence: 99%

Reduction in axle oil operating temperatures by fluids with optimized torque transfer efficiencies

Devlin

Senn

Turner

et al. 2005

Lubrication Science

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Effective axle oils must efficiently transfer torque from the drive-train to the wheels, while maintaining low axle oil operating temperatures. Previous studies have shown that fluids, which form thicker elastohydrodynamic (EHD) films and have lower EHD friction, have higher torque transfer efficiencies (TE) and lower axle oil operating temperatures (OT). In general, oils with higher viscosities form thicker films and those with lower viscosities have lower EHD friction. Therefore, optimizing oil's rheological properties to maximize TE and minimize OT is difficult. In this paper, we examine two approaches to maintaining high TE while reducing OT. One approach is to minimize boundary friction since previous studies have shown that the boundary frictional properties of oils influence OT and not TE. A second approach is to more thoroughly examine the effect of rheology on film thickness and EHD friction. Film thickness and EHD friction are related to the high temperature high shear viscosity and pressure-viscosity coefficient of oils. We have found that oils with high pressureviscosity coefficients and low high temperature high shear viscosities will form thick films and have low EHD friction. This optimized combination of physical parameters, along with lowering the boundary friction coefficient of axle oils, results in oils with high TE and low OT.

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Automotive Fuel Savings Through Selected Lubricants

Cited by 21 publications

References 9 publications

The role of MoDTC tribochemistry in engine tribology performance. A Raman microscopy investigation

The role of MoDTC tribochemistry in engine tribology performance. A Raman microscopy investigation

Fuel economy of multigrade gear lubricants

Reduction in axle oil operating temperatures by fluids with optimized torque transfer efficiencies

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