FRICTION MODEL IN IC ENGINE

A model is presented to assess the friction losses in an ignited automobile internal combustion engine. The mathematical model consists of sub-models representing the piston assembly in friction interaction piston ring, crankshaft journal bearings, and piston skirt and valve train system. The engine components are analysed using a computer code (CRAFT) to identify the various engine operation processes. In predicting the engine's transient behaviour and the corresponding fuel consumption, the accuracy of the friction models and sub-models is critical. Developing a robust sub model of friction is considered to determine the separate contribution of the main components of friction. The four-stroke engine or four-cycle is an internal combustion engine (IC) in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the piston's complete movement in either direction along the cylinder. The results of friction of piston skirt assembly-cylinder liner contact, crankshaft journal bearings, connecting rod and valve train journal bearings are presented in this paper.