Real Time Fast Running Engine Modelling in GT Power- Development of the Virtual Drivetrain Simulation Environment

Abstract

This thesis work deals with conversion of existing engine model to a Real Time Fast Running Model (FRM) in GT Power for the VolvoTrucks Heavy Duty Diesel Engine. The existing model is a high fidelity engine model which is good to run steady state simulation, but when it comes to transients simulation, it is difficult and slower. The GTPower engine model is a physics based model that provides detailed information such as heat transfers, pressures, temperature etc. These models are not completely accurate models, but it replicates the details of the process that is involved. The Global Simulation Platform (GSP) is a tool developed by Volvo Trucks in Matlab Simulink which can perform vehicle level simulations with transient drive cycles using empirical engine plant model. The potential of GSP can be further enhanced by replacing a empirical engine plant model with realtime detailed engine models. This integrated model is advantageous inevaluatingneweremissionorfuelreductionconceptsandalsominimizingthecost for repetitive physical testing in case of a component change or a concept change, all of this can be done at the early stages of a "New Project" or even during the current project. This report presents FRM technique as a solution to get the model running faster and the accuracy of the FRM is compared and verified with the results from the Volvo Engine Test Cell to put in to effect. The report also involves the study of Miller cycle inlet valve closure profiles with increased Peak Cylinder Pressure and Compression Ratio. A simple hybrid system in the FRM was designed to present the application capability of the FRM in GSP.