Analysis of possibilities of friction losses determination in engine crank mechanism

Friction losses generated in kinematic nodes of IC engine, especially those in piston-cylinder assembly, affect the engine total efficiency to the considerable degree. Analytical determination of those losses using mathematical models of engine selected kinematic nodes requires verification carried out on real objects. These can be material models of these objects or engines appropriately arranged for measurements alike. This paper presents methods of determination of losses generated at some kinematic nodes of engine as well as ways of result verification.