Physical modeling of a heavy-duty engine for test-cycle simulations in Modelica

Sammanfattning: Engine development for reduced fuel consumption and for the ability to use alternative types of fuels is required as emissions and the limited access of petroleum are issues coupled to diesel engines. Experimental testing is in many cases insufficient and expensive in comparison with simulations for engine development. This thesis is focused on extending a model of a diesel compression-ignition engine for test-cycle simulations with a new cylinder model. The model was developed with Dymola executing code written in the language Modelica and with the external Engine Dynamics Library developed by Modelon AB. There were prior engine models in the Engine Dynamics Library but there was a need for a model extension primarily to get a model able to handle a larger operating range. The result of the thesis is an engine model that can execute simulations with zero speed and fuel injection that the previous models in Engine Dynamics Library could not handle. During model evaluation the model was compared to a calibrated map-based model at a test-cycle where the map-based model could be executed. The model developed during this thesis research was successfully able to capture much of the dynamics of the available map-based model.