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In an industrial context, close to the start of production and development of Engine Control Unit (ECU) systems, it is necessary to validate the complete dataset of the application and thus, to run software tests on a real ECU which is connected to a closed loop HIL Test bench, In the field of application for the simulation of dataset and the reduction of real vehicle tests, it is required to simulate an engine behaviour in terms of mixture mass and energy flow rate, temperature and pressure. The aim of this work is to reproduce this engine behaviour with a focus on combustion process and component simulation models, Oxidation Catalyst (OxiCat) and Diesel Particulate Filter (DPF). A model has been developed with the help of experimental data extracted from an Original Equipment Manufacturer (OEM) engine project.