Estudo de um sistema de gerenciamento de motor a combustão interna do ciclo Otto baseado em controle de torque

Abstract

The construction and validation of torque-based control algorithms for internal combustion engines require significant time and costs in bench or vehicle testing, where a failure in calibration or the algorithm can cause damage to the engine, vehicle, or the individuals involved in the tests. To minimize these risks, the Volkswagen EA 113 2.0 engine studied in the present work was replaced by a mathematical model, included in the MATLAB/Simulink tool, where there are libraries dedicated to the simulation of internal combustion engines, which Simscape Driveline was selected due to its practicality and mathematical robustness. The development of these control algorithms can be optimized through their implementation in Model-In-the-Loop, but for this, it is essential that the mathematical model used has a considerable similarity to the engine used. To ensure this requirement, the model’s behavior was analyzed by comparing it with the real engine data through Torque-Speed curves and pV diagram. The mathematical model of the engine integrated into the Simscape Driveline library blocks resulted an average relative error of less than 3% for the torque between the model and the real engine, for a speed range of 1500 to 4500 rpm. The optimization obtained in torque control by Model-In-the-Loop resulted in an average relative error below 3% for best representative range of the mathematical model.