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Advances in Tribology
Volume 2017, Article ID 9240703, 17 pages
Research Article

A Novel Approach to Reduction of Frictional Losses in a Heavy-Duty Diesel Engine by Reducing the Hydrodynamic Frictional Losses

1Vehicle Engineering, Volvo Group Trucks Technology, 405 08 Gothenburg, Sweden
2Advanced Technology & Research, Volvo Group Trucks Technology, 412 88 Gothenburg, Sweden
3Powertrain Engineering, Volvo Group Trucks Technology, 405 08 Gothenburg, Sweden
4SET, Halmstad University, P.O. Box 823, 301 18 Halmstad, Sweden

Correspondence should be addressed to Staffan Johansson; moc.liamtoh@jsup

Received 29 September 2016; Accepted 26 February 2017; Published 9 May 2017

Academic Editor: Yuansheng Jin

Copyright © 2017 Staffan Johansson et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An important parameter in the reduction of fuel consumption of heavy-duty diesel engines is the Power Cylinder Unit (PCU); the PCU is the single largest contributor to engine frictional losses. Much attention, from both academia and industry, has been paid to reducing the frictional losses of the PCU in the boundary and mixed lubrication regime. However, previous studies have shown that a large portion of frictional losses in the PCU occur in the hydrodynamic lubrication regime. A novel texturing design with large types of surface features was experimentally analyzed using a tribometer setup. The experimental result shows a significant reduction of friction loss for the textured surfaces. Additionally, the textured surface did not exhibit wear. On the contrary, it was shown that the textured surfaces exhibited a smaller amount of abrasive scratches on the plateaus (compared to the reference plateau honed surface) due to entrapment of wear particles within the textures. The decrease in hydrodynamic friction for the textured surfaces relates to the relative increase of oil film thickness within the textures. A tentative example is given which describes a method of decreasing hydrodynamic frictional losses in the full-scale application.