|Tipo di tesi||Tesi di laurea magistrale|
|Titolo||Engine in the loop: un approccio flessibile al testing e alla calibrazione dei motori a combustione interna|
|Titolo in inglese||Engine in the loop: a flexible approach to engine testing and calibration|
|Struttura||Dipartimento di Ingegneria "Enzo Ferrari"|
|Corso di studi||Advanced Automotive Engineering (D.M.270/04)|
|Data inizio appello||2020-10-22|
|Disponibilità||Accessibile via web (tutti i file della tesi sono accessibili)|
La crescente complessità e variabilità dei powertrain attuali riflette richieste di mercato sempre più stringenti in termini di consumi di carburante, emissioni, prestazioni e soddisfazione del cliente.
The continuously increasing legal and customer requirements regarding emissions and fuel consumptions as well as the ever-challenging requirements for engine and vehicle performance in all global markets are the drivers for a constantly increasing complexity and variability of vehicle powertrains. At the same time, a fierce market competition has driven OEMs to continually shorten the product development time. To simultaneously fulfil the global legislative requirements and the market-specific customer demands, one approach is to deploy powertrains with innovative and sophisticated solutions, to further improve vehicle performance and to reduce polluting emissions. In order to ensure the continuous reduction of time-to-market intervals and taking into account the extensive additional testing efforts required, especially for RDE compliance, it is necessary to test powertrain and vehicle components on the overall vehicle level at the earliest possible stage in the vehicle development process to avoid late hardware or even concept changes shortly before the start of production. Therefore, it emerges that the automotive industry is facing a demanding challenge, where the design and performance requirements of the vehicle as well as strict emission regulations must be respected. In this document the testing platform based on the Engine-in-the-loop (EiL) approach is described, on which I worked during my traineeship period at Alma-Automotive S.r.l. for Maserati S.p.A. Coupling the real engine with a simulated vehicle offers a chance to vary and optimize component and subsystem designs and calibrations based on specific goals and constraints at an early stage. That is the Engine-in-the-loop approach, which is becoming a powerful tool and will be more widely used in the near future. It works with the same principle of Hardware-in-the-loop (HiL) approach, realizing a synergistic combination of the real (the engine) and virtual (every component of the vehicle except for the engine) parts, which facilitates system development and greatly reduces development time and cost. Different activities regarding model development, testing, analysis of ECU logic, data analysis and calibration were involved during this work. First of all, a simulation model of the vehicle with all its subsystems has been developed in MATLAB/Simulink. The model is compiled and subsequently deployed as generated code in a LabVIEW-based platform which is interfaced to the test bench control system. The model runs and exchanges information in real time with the test bench control system: the dynamometer is controlled with a target engine speed which results as output from the model and the measured engine torque is returned as input to the model itself. The EiL approach can be used for several scopes because of the intrinsic advantages that brings. The main aim of the present work is the execution of drive cycles directly at the engine test bench.