Piston Ring Tribological Challenges on the Next Generation of Flex-fuel Engines

Ferrarese, Andre; Marques, Gisela Ablas; Tomanik, Eduardo; Bruno, Rafael Antonio; Vatavuk, Jan

doi:10.4271/2010-01-1529

Cited by 33 publications

(17 citation statements)

References 6 publications

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“…A description of orthogonal arrays, the associated linear graphs, criteria behind the selection of the L16 (2 15 ) orthogonal array and criteria for control factor allocation to particular columns is given in De Silva et al [18]. The L16 (2 15 ) test matrix form was used for both the separated oil phase tests and the white sludge tests for consistency, as shown in Table 7 whilst the linear graph, Fig. 6, shows the columns of L16 (2 15 ) test matrix into which the control factors and interactions have been allocated.…”

Section: Taguchi Methodsmentioning

confidence: 99%

“…The L16 (2 15 ) test matrix form was used for both the separated oil phase tests and the white sludge tests for consistency, as shown in Table 7 whilst the linear graph, Fig. 6, shows the columns of L16 (2 15 ) test matrix into which the control factors and interactions have been allocated. It is important to note that the concentrations of A and B given in Table 7 indicate the initial concentrations of ethanol and water mixed with the lubricant to obtain the corresponding oil and sludge phases following phase separation.…”

Section: Taguchi Methodsmentioning

confidence: 99%

“…In fact the piston assembly, comprising the piston rings and the piston skirt, is the major contributor to engine friction at around 40-60% [17]. Furthermore, to obtain performances equivalent to gasoline and to take advantage of the higher octane rating of ethanol, engines are tuned to generate a peak combustion pressure 20-30% higher than that with gasoline [15]. It has also been shown that the peak combustion pressure occurs closer to top dead centre with ethanol [15], which increases the severity of the tribological conditions at the piston ring-cylinder wall interface.…”

Section: Introductionmentioning

confidence: 98%

“…Generally, an automobile operating on ethanol consumes 30% more fuel than with gasoline [15] and thus the requirement to achieve improved fuel economy becomes even more challenging. One way to achieve this objective is to reduce engine friction, which can result in a fuel efficiency loss of around 7.4% for light duty vehicles of which the piston rings contribute around 25% [16].…”

Section: Introductionmentioning

confidence: 99%

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Tribometer Investigation of the Frictional Response of Piston Rings when Lubricated with the Separated Phases of Lubricant Contaminated with the Gasoline Engine Biofuel Ethanol and Water

et al. 2011

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The biofuel ethanol, a viable and cost-effective gasoline substitute, is being blended at increasingly higher concentrations in gasoline, heightening the need to investigate its effects on current automotive engine lubricants in terms of fuel economy and engine durability. The friction at the piston ring/cylinder wall interface with a fully formulated gasoline engine lubricant contaminated with ethanol and water was investigated using a Plint TE77 reciprocating tribometer and reported in a previous paper by the authors. This research takes this one stage further by studying the friction in the same tribometer configuration when lubricated with the separated phases the same contaminated lubricant forms when left undisturbed, as would happen when a vehicle is parked or garaged. The lubricant mixture separated into two distinct phases, an oil phase and a water and ethanol based 'white sludge' phase, both phases characterised by FTIR spectroscopy and viscosity. Significant reductions in friction were obtained when the piston ring-cylinder wall interface was lubricated with the separated phases compared to the formulated reference lubricant. When lubricated with the separated oil phase, temperature was shown to be the dominant contributor to the frictional response. When lubricated with the separated sludge phase, ethanol independently contributed to the frictional response whilst the interactions between ethanol and temperature, water and temperature and water and speed were also important.

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Section: Taguchi Methodsmentioning

confidence: 99%

Section: Taguchi Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tribometer Investigation of the Frictional Response of Piston Rings when Lubricated with the Separated Phases of Lubricant Contaminated with the Gasoline Engine Biofuel Ethanol and Water

et al. 2011

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“…[1] In Brazil, the use of flex-fuel engines allied with market cost sensitiveness, bring specific challenges on R&D efforts to bring solutions to the market. As example, the higher tribological severity when using ethanol on the piston rings [4] brings some unique demands to flex-fuel engines. For the piston, the different combustion pressure and thermal conditions, cause different thermal expansion and also need to be specifically studied before introducing a low friction solution in the market.…”

Section: Introductionmentioning

confidence: 99%

Powercell Solutions for Engine Fuel Consumption Reduction

Neto¹,

Silva²,

Tomanik³

et al. 2014

Anais Do XXII Simpósio Internacional De Engenharia Automotiva

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The Brazilian "Inovar-auto" tax program brings the need to improve engine fuel efficiency. In this paper, the impact on fuel savings by using low friction components was evaluated on representative Brazilian ethanol fueled engines. The vehicle certification cycles, and the typical urban drive, focus on low engine speed-loads where the mechanical losses are around 10% of the fuel energy. To define design changes on the engine components with more fuel saving potential, a proprietary simulation tool was used. After the selection of the design changes with greater potential, the engine was tested in a dedicated dynamometer cell with engine control, accuracy on fuel consumption measurement and fast acceleration transients needed to reproduce the fuel consumption cycles. The comparison between the baseline and the proposed lower friction components was done by 3 methods: a) motoring torque b) fuel consumption mapping, with average weights representative of the homologation cycles c) engine transient cycles, where the vehicle FTP75 and highway cycles were reproduced in the engine dynometer. The proposed lower friction components showed 2 to 6% fuel saving on the tested engines.

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Critical review on recent progress of ethanol fuelled flex‐fuel engine characteristics

Azhaganathan

Ashok

2022

Intl J of Energy Research

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Summary Ethanol‐powered spark ignition (SI) engines have the potential to mitigate the twin crisis of fossil fuel depletion and exhaust emissions. However, the successful promotion of ethanol is hindered due to the restriction of fuel blend diversity and design features in the conventional SI engine. The fuel flexibility can be overcome by the use of flex‐fuel engine (FFE) technology with appropriate changes in engine design features for a wide range of ethanol blends. The understanding of FFE based on various technical aspects has greater potential in the automotive sector. Therefore, this review paper provides a holistic approach to critically analyze the various technical aspects of FFE. In this work, the application of ethanol blends on FFE output characteristics is reviewed critically considering the effects of engine operating conditions and parameters. Further, the impact of ethanol blends on material compatibility, cold starting characteristics, and unregulated emissions are analyzed. The outcome of the study shows that combustion and performance characteristics such as cylinder pressure(CP), heat release rate (HRR), and brake thermal efficiency (BTE) are improved in FFE operation due to the clean‐burning characteristics of ethanol blends. Also, carbon monoxide(CO) and hydrocarbon (HC) emissions decreased without any significant improvement in nitrogen oxides (NOx) emissions with a wide range of ethanol shares in FFE. Finally, this study summarizes the present status of research in FFE and creates a route towards the direction of multidisciplinary research need in the future that supports the application of different types of biofuels in FFE.

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Piston Ring Tribological Challenges on the Next Generation of Flex-fuel Engines

Cited by 33 publications

References 6 publications

Tribometer Investigation of the Frictional Response of Piston Rings when Lubricated with the Separated Phases of Lubricant Contaminated with the Gasoline Engine Biofuel Ethanol and Water

Tribometer Investigation of the Frictional Response of Piston Rings when Lubricated with the Separated Phases of Lubricant Contaminated with the Gasoline Engine Biofuel Ethanol and Water

Powercell Solutions for Engine Fuel Consumption Reduction

Critical review on recent progress of ethanol fuelled flex‐fuel engine characteristics

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