Abstract
KEYWORDS - Variable Valve Lift, EF7 engine, BSFC, NEDC, GT-Power
ABSTRACT
Car manufacturers have been looking for innovative and cost-effective methods for improving their products efficiency. Among these amelioration methods, Variable Valve Lift (VVL) is widespread as many producers have utilised this system in their production engines. The engine performance has been predicated widely utilising diverse computer simulation packages. Thus, in current work, modelling of a 4-cylinder PFI gasoline engine, named EF7, had been developed in the GT-Power simulation programme with aim of engine performance optimisation at partial load conditions over NEDC drive cycle.
Indeed, after obtaining a reasonable validation of model against experimental test results, effects of altering intake valve‟s lift and timing on the in-cylinder combustion process and engine performance were analysed using a predictive combustion pattern based on the turbulent flame. The final results show the potential of VVL approach for the overall performance optimisation over whole operating points. It has been concluded that VVL approach could help the mounted VVT (variable valve timing) system to improve the engine performance. Thus, practical utilisation of VVL system is recommended in the mass production.