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Title: Effect of cylinder deactivation on tribological performance of piston compression ring and connecting rod bearing
Authors: Morris, Nicholas J.
Mohammadpour, Mahdi
Rahmani, Ramin
Johns-Rahnejat, P.M.
Rahnejat, Homer
Dowson, D.
Keywords: Cylinder deactivation
Piston compression ring
Big-end bearing
Friction
Power loss
Issue Date: 2018
Publisher: Elsevier (© The authors)
Citation: MORRIS, N.J. ... et al, 2018. Effect of cylinder deactivation on tribological performance of piston compression ring and connecting rod bearing. Tribology International, 120, pp.243-254
Abstract: Thermo-mixed-hydrodynamics of compression rings and big-end bearings are presented. Frictional losses under normal engine operating conditions for a gasoline engine and those with cylinder deactivation (CDA) are predicted. With CDA, the combustion chamber pressure increases in the active cylinders, whilst some residual pressure remains in the deactivated ones. For the former, the increased in-cylinder temperatures reduce viscous friction, whilst reducing the load carrying capacity, promoting increased boundary interactions. In deactivated cylinders, lower contact temperatures yield increased viscous friction. Overall, a 5% improvement in expended fuel is expected with the application of CDA. However, 10% of these gains are expended due to increased friction. The study demonstrates the need to consider total system effects when introducing new technologies such as CDA.
Description: This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: The authors would like to express their gratitude to the UK Engineering and Physical Sciences Research Council (EPSRC) for the financial support of the Encyclopaedic Program Grant (www.Encyclopaedic.org), under which the majority of this research was carried out.
Version: Accepted for publication
DOI: 10.1016/j.triboint.2017.12.045
URI: https://dspace.lboro.ac.uk/2134/28074
Publisher Link: https://doi.org/10.1016/j.triboint.2017.12.045
ISSN: 1879-2464
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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