Search Results

The increasing demand for environmentally friendly and fuel-efficient transportation and power generation requires further optimization and minimization of friction power losses. Calculating friction of internal combustion engines, especially the friction contribution from piston rings and skirt, requires detailed knowledge of the lubrication and relative motion of the components being in contact. This research presents a successful match of simulated and measured piston inter-ring pressures in several ring field locations. Good correlations demand excellent measurement results combined with a meticulous and comprehensive simulation model setup. This includes all data describing piston, piston rings, liner, and oil under real operating conditions within the entire engine performance map. To do so, the authors utilized a Floating-Liner-Engine - based on a heavy-duty diesel truck engine - to measure inter-ring pressures in the entire cascade from crown land down to third ring groove.

The increasing demand for environmentally friendly and fuel-efficient transportation and power generation requires further optimization and minimization of friction power losses. With up to 50% of the overall friction, the piston cylinder unit (PCU) shows most potential within the internal combustion engine (ICE) to increase mechanical efficiency. Calculating friction of internal combustion engines, especially the friction contribution from piston rings and skirt, requires detailed knowledge of the dynamics and lubrication regime of the components being in contact. Part I of this research presents a successful match of simulated and measured piston inter-ring pressures at numerous operation points [1] and constitutes the starting point for the comparison of simulated and measured piston group friction forces as presented in this research.