Abstract
The aim of this paper is to introduce the theoretical results obtained using computer codes realized to investigate on the dynamic behaviours and the friction losses in a reciprocating internal combustion engine.
This paper shows the structure of an additional module of CRAFT (Code for Rapid Assessment on
Frictional Torque), a computer program developed by the Applied Mechanics Group of the Department of Mechanical Engineering - University of Salerno [1].
This computer code takes into account the effects lubrication regime about piston assembly (piston skirt and piston ring pack), crankshaft and connecting rod journal bearings and valve train to evaluate the friction losses in a sparked ignited internal combustion engine.
The CRAFT algorithms are based on more sub-models developed to investigate on the specific friction loss.
The following pages show the engine dynamics and friction physical models with the description of engine design data module and the operating conditions user defined.
The realized additional modules allow to analyse the piston secondary motions with extremely contained computational time in comparison to the numerical FEM procedures previously used.