Modeling of an internal combustion engine using Power-Oriented-Graphs and electrical analogy

In this paper the Power-Oriented Graphs (POG) technique is used for modeling an internal combustion engine through electrical analogy. The aim of the authors, starting from an analogy with electrical systems, is to simplify the approach eliminating the space dynamics, while preserving the time dynamics. In this way, one can obtain an engine description similar to an electric circuit, with all the useful consequences in term of existence and numerical availability of the solution. The advantages are in the specific correspondence found between the engine components and variables with electrical counterparts . The main benefit achievable with this methodology is the simplicity to compose the whole engine model and customize it including the differential equations of the engine in state space form. The POG technique is a graphical modeling technique which uses only two basic blocks for modeling physical systems and the state space mathematical model of a system can be ``directly'' obtained from the corresponding POG representation.