Investigations on the frictional performance of laser surface textured piston rings in an automotive engine test rig under different coolant and lubricant temperature

Research in the field of internal combustion engines is currently focussed on two primary objectives: improving fuel efficiency and reducing emissions. A significant portion of this research is directed towards addressing frictional losses, which account for 40% of the total energy dissipation in a typical engine and holds the potential to substantially enhance fuel economy. Within the scope of this study, we have identified the application of micro-geometric patterns on piston rings as a promising technology for mitigating friction between the piston rings and cylinder liners. Additionally, our findings reveal that the utilization of textured rings in engines led to a remarkable reduction in lubricant oil consumption, approximately 12.35%. The key factors contributing to this reduction include the uniform distribution of surface textures and the viscosity-driven flow of oil within the contact surfaces, particularly under the conditions of boundary lubrication. These factors collectively exert a notable influence on engine performance.