Abstract
In this paper a well known Residual Gas estimation model is evaluated on real data and extended to an engine configuration that involves an external Exhaust Gas Recirculation (EGR) circuit and a Variable Valve Timing (VVT) system. The model proposed by M.Mladek and C.H.Onder (Swiss Federal Institute of Technology) has been modified to take into account the presence of these two systems, and has been validated comparing the results to data obtained form a 6 cyliders engine. The main goal of this work is to validate and extend to external EGR input the given model, with the aim of designing VVT model based control strategies for combustion and pollution emission optimal performances.
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