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Effect of cylinder deactivation on tribological performance of piston compression ring and connecting rod bearing

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posted on 12.01.2018 by Nick Morris, Mahdi Mohammadpour, Ramin Rahmani, P.M. Johns-Rahnejat, Homer Rahnejat, D. Dowson
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.

Funding

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.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Tribology International

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

Publisher

Elsevier (© The authors)

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Acceptance date

28/12/2017

Publication date

2018-01-02

Notes

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/

ISSN

1879-2464

Language

en

Licence

Exports