Abstract
When it comes to the European Green Deal and Carbon Neutrality, we cannot ignore a fundamental element: the transport sector in the EU alone is responsible for 27% of greenhouse gas emissions and, between 1990 and today, aviation and maritime navigation have increased emissions by 50%. But the real lion’s share has been played by road transport, which alone contributes to 71.7% of emissions in transport, while railways have an extremely small impact, equal to about 1%. The present work aims to improve the performance of a commercial ICE through a double supercharging with eBooster to improve performance and reduce consumption, trying to reduce consumption, emissions, improve the overall efficiency of the vehicle and to make road transport sustainable. Thanks to this system it is possible to have a larger turbocharger that guarantees a greater power at high engine rotational speed without losing the torque at low rpm that will be guaranteed by the electric compressor. The operational conditions and parameters have been studied through a one-dimensional analysis via software. Through this simulation, different configurations were tested in order to obtain, in a preliminary way, the solution that maximizes the performance of the engine, thus saving in terms of costs and time on experimental tests. All simulations are carried out at full load with the same stoichiometric ratio of the mixture and ignition time, within a speed range between 2500 and 8500 rpm. Initially, a model with turbocharger available on the market has been studied, simulated and proposed, operating with good efficiency at a higher engine rotational speed. The choice to use a commercial compressor has been dictated by the possibility of replicating the operational maps of the device and using them in the simulations. Once this phase was optimized, it has proceeded to study which electrical device to introduce. After the addition of the electric compressor, an optimization of the system has been conducted. This simulation allows to compare different dimensions of the connection (piping, manifolds, valves, etc.) trying to exploit the pressure waves that are inside generated to improve the filling of the engine. Finally, through the analysis of the pressures inside the intake and exhaust ducts and the cylinder internal pressure, an ideal timing for this system has been set. Through the carried-out simulations, it was possible to underline that the larger turbocharger increases the engine efficiency, both from the point of view of power and fuel consumption, and thanks to the electric compressor it is possible to have a favorable torque curve at low rotational speed.
