1D thermo-fluid dynamic modelling of a turbocharged 3-cylinder GDI engine : map calculation and simulation of real drive emission test cycles

The automotive industry, in recent years, has been experiencing a deep and radical transformation mainly due to the limitations imposed by the supervisory agencies on performances and pollutant emissions. This necessary research for new solutions has led to the evolution of new technologies, such as the increasingly prominent ones of cars with hybrid or completely electrified powertrains, or the improvement of traditional ones. In order to reduce research costs, simulation methods have been developed to carry out increasingly precise simulations of internal combustion engines. The present study aims to verify the validity and accuracy of the 1D simulation model developed by the Department of Energy in Politecnico di Milano with the software Gasdyn by comparing it with different engine operating approaches carried out experimentally. The engine analysed is a turbocharged 3-cylinder under development by Renault-Nissan. The validation process is divided into three main phases: analysis of the main engine parameters varying the rotational speed at full load, comparison of the operational maps of performance and emissions varying both load and rotational speed (from 750 to 6250 rpm), and confrontation of the physically acquired real driving emission (RDE) data with those simulated by the Gasdyn software, together with a MATLAB Simulink model, having the same input data and the same operating characteristics verified in the previous steps.