Simulation of valve gear dynamics using generalized dynamic model

Abstract

The paper presents a generalized dynamic model of valve gear of internal combustion engine. This model allows to build calculation schemes of required structure and complexity in an automated procedure, taking into consideration valve gear design features, such as presence of initial forces or clearances in links, variability of pa-rameters, energy dissipation at oscillations, possibility of kinematic chain breaks in one-way links and impact inter-action of details. The simulation of oil hydrodynamics both in the gaps and hydraulic tappets is also provided. Calculation results of valve gear oscillatory proc-esses, confirming the model adequacy at various engine operation regimes, are given. The presented calculations of hydraulic tappet allow to estimate its influence on valve timing and oscillatory processes in the mechanism at vari-ous high-speed power setting.