Combined lubricant-surface system approach for potential passenger car CO2 reduction on piston-ring-cylinder bore assembly

Author(s)

Tomanik, Eduardo ^[1] ; Profito, Francisco ^{[1, 2]} ; Sheets, Brett ^[3] ; Souza, Roberto ^{[1, 2]}

Affiliation

^[1] Univ Sao Paulo, Polytech Sch, Surface Phenomena Lab LFS, Ave Prof Mello Moraes 2231, BR-05508030 Sao Paulo, SP - Brazil

^[2] Sheets, Brett, AVL USA, 47519 Halyard Dr, Plymouth, MI 48170 USA.Tomanik, Eduardo, Univ Sao Paulo, Polytech Sch, Surface Phenomena Lab LFS, Ave Prof Mello Moraes 2231, BR-05508030 Sao Paulo, SP - Brazil

^[3] AVL USA, 47519 Halyard Dr, Plymouth, MI 48170 - USA

• Document type: Journal article
• Source: TRIBOLOGY INTERNATIONAL; v. 149, SEP 2020.
• Web of Science Citations: 1

Abstract

The impact of reducing friction losses on the fuel consumption and CO2 emissions was investigated through computational simulation of piston ring dynamics. Experimentally determined cylinder bore surface finishes, low viscosity oil and ring coatings response to oil additives were used as simulation inputs. Oil viscosity grades from SAE10W-40 to SAEOW-4 were considered. 3D roughness measurements of regular and ``mirror-like{''} cylinder bores were used to estimate the flow factors coefficients for the average Reynolds equation and asperity contact stiffness. The combination of smooth cylinder bores, low viscosity oils with appropriate additives promoted ring pack FMEP reductions of up to 66% at part load and WOT with consequent CO(2 )reductions of up to 10% at part load and 1.5% at WOT. (AU)

• FAPESP's process: 09/54891-8 - Tribological challenges in flex-fuel engines
• Grantee: Roberto Martins de Souza
• Support type: Program for Research on Bioenergy (BIOEN) - Research Partnership for Technological Innovation (PITE)