Tribodynamic modeling of piston compression ring and cylinder liner conjunction in high-pressure zone of engine cycle

Piston compression ring and cylinder liner contact contributes a significant part of friction loss in an engine. Most of this loss occurs during compression and power stroke transition (i.e., between 300A degrees to 400A degrees crank position). It is because of the combustion gas pressure is higher in this region to enhance ring-liner contact friction. In this paper, we developed a tribodynamic model to study the transient thermoelastohydrodynamics of ring-liner contact. It takes into account the combined solution of Reynolds equation, energy equation, and elastic deformation equation considering ring-liner conformability and rheology change. We estimate the minimum film profile, friction force, and friction power loss within a high-pressure zone of a high-performance engine. Roughness of the liner is characterized using R (k) parameter for better surface representation.