As per pieces of literature, 40 to 60 % of friction losses in an Internal combustion engine occur in piston-ring pack-liner assembly and, there is a significant supportive role of simulation in improving this assembly. Literature is also available which tells, how changes in pistons affect oil consumption. Thus, piston dynamics plays an important role in oil consumption. Furthermore, the Piston Movement Module simulation results also serve as a very important input for postprocessing to calculate piston ring dynamics.
This research work is conducted to understand the effect of piston secondary motion, on oil consumption, blow-by, and friction. In this work, the results of ring dynamics and oil consumption simulation modules are studied with consideration and non-consideration of piston secondary motion results. The parameters like minimum oil film thickness, lubricating oil consumption, blow-by, friction, and friction power loss are investigated. Results indicate that oil throw-off and oil scraping from the top ring occurs when piston secondary motion is considered. Moreover, with piston secondary motion consideration, there is a significant rise in blow-by gases during the compression stroke and there is a marginal effect on friction power loss.
Key words : piston secondary motion, ring dynamics, lubricating oil consumption, blow by, and friction