Mean Value Engine Model Using Object Oriented Modeling

Object-oriented or component-based modeling greatly facilitates model development for large and complex multi-domain physical systems. It uses predefined and reusable component models. Connections between component models represent actual physical connections. Non-physical connections are not needed. Therefore, the model is much easier to be understood and used by general model users.

The purpose of this paper is to demonstrate that object-oriented modeling is very suitable for mean-value engine models. Models for throttle, intake manifold, EGR valve and cylinder are developed separately and assemble together through connections. The component models are built from first principles in thermodynamics. Bidirectional flows are allowed at all ports for every component. The intake manifold uses mass, temperature and EGR mass fraction as state variables. Simulation results of a typical engine are included.