Abstract
Starting from the mathematical model developed has made a complex simulation of the propulsion system behaviour in various constructive-functional situations, called MATCEL-PROP. By customizing this model, can define it completely stabilized operating modes of propulsion systems and their dynamic, economic and pollution parameters. This provides, even the design phase, definition of additional constructive and functional criteria against the current, to ensure stable and economic operation, in an area as extensive.
Key words: automotive powertrain, stable and economic operation.