Analysis of the Journal Bearing Friction Losses in a Heavy-Duty Diesel Engine

Analysis of the Journal Bearing Friction Losses in a Heavy-Duty Diesel Engine

Internal combustion engines (ICE) for the use in heavy-duty trucks and buses have to fulfil demanding requirements for both vehicle efficiency as well as for emission of greenhouse gases. Beside the piston assembly the journal bearings are among the largest contributors to friction in the ICE. Throu...

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Bibliographic Details
Published in:Lubricants Vol. 3; no. 2; pp. 142 - 154
Main Authors: Knauder, Christoph, Allmaier, Hannes, Sander, David Emanuel, Salhofer, Stefan, Reich, Franz Markus, Sams, Theodor
Format: Journal Article
Language:English
Published: Basel MDPI AG 01-06-2015
Subjects:
Buses (vehicles)
Computer simulation
Diesel engines
Friction
Friction reduction
journal bearing
Journal bearings
Lubricants
measurement
simulation
test rig
Viscosity
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Summary:Internal combustion engines (ICE) for the use in heavy-duty trucks and buses have to fulfil demanding requirements for both vehicle efficiency as well as for emission of greenhouse gases. Beside the piston assembly the journal bearings are among the largest contributors to friction in the ICE. Through a combination of measurements and validated simulation methods the journal bearing friction losses of a state-of-the-art heavy-duty Diesel engine are investigated for a large range of real world operating conditions. To this task recently developed and extensively validated simulation methods are used together with realistic lubricant models that consider the Non-Newtonian behaviour as well as the piezoviscous effect. In addition, the potential for further friction reduction with the use of ultra-low viscosity lubricants is explored. The results reveal a potential of about 8% friction reduction in the journal bearings using a 0W20 ultra-low viscosity oil with an HTHS-viscosity (The HTHS-viscosity is defined as the dynamic viscosity of the lubricant measured at 150 degree C and at a shear rate of 106 s
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ISSN:2075-4442
2075-4442
DOI:10.3390/lubricants3020142