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COBEM 2019
25th International Congress of Mechanical Engineering
DATA COMPARISON USING SIMULATION TO NBR6601 U.S. FTP 75
Submission Author:
Bruno Silva de Lima , MG
Co-Authors:
Matheus Ferraz de Oliveira, Gabriel Anunciação Kopte, Bruno Silva de Lima, Jose Baeta
Presenter: Bruno Silva de Lima
doi://10.26678/ABCM.COBEM2019.COB2019-0026
Abstract
The numerical vehicle simulation is very important in engineering for validation of prototype concept checking the results on different drive cycles and dynamic situations as drivability tests, before the construction phase. The main objective of such numerical model is to predict the performance, fuel consumption and to help aiding the creation of base criteria to choose the best powertrain configurations, using computational hours rather than engineer hours, reducing design costs and assembly work, as well as the project time. This time economy is further used to meet other important project targets and to deliver the best technology for each specific project. Furthermore, the literature presents different strategies based on dynamic and bench tests for the engine power and torque maps in order to improve the vehicle performance, because of the powertrain inertia, the engine operation and the calibration maps. The specific map strategies based on fuel economy and optimization are very complex to be established due to large number of factors that can influence the vehicle behavior, the engine state and the driver feeling, required acceleration and vehicle speed in different points of the cycle. In this paper, it was analyzed the importance of different engine/driver maps to optimize the model, with objective to show that utilizing the real data acquired from benchmark projects, it is possible to deliver a really validated model, basic and simple, with results less than 1% error. The control maps were verified using INCA program to get DATA from a real car. The FCA database was used to check the engine fuel consumption to the standard cycle U.S. FTP-75 NBR6601. The simulations were performed using GTsuite software where the model based on a conventional 1.3L vehicle was developed. The simulation results were stored in a database to compare them with the measured results obtained within dynamic tests on dynamometer of a similar vehicle configuration. The objective is to prove, that is possible during the development/calibration phases the creation/utilization of basic vehicle simulations and models, helping to meet and improve the calibration targets, increasing the software complexity.
Keywords
Powertrain, Simulation, Fuel consumption, calibration
