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This paper will describe an approach method for the complete modelling of an engine; our approach provide software for very detailed description (Knowledge model) as well as simple models (Representation model) which can be implemented in a governor to improve consistently the system behaviour. The software for very detailed description require performing workstation (SUN: Californian Computer Manufacterer; etc., …) and the simple models can be used in real time on the latest microprocessors. We will describe here essentially the knowledge model part of this research. As they offer a similar approach to all types of systems, Bond graphs are a tool of great interest for knowledge modelling. This tool has a limited expansion in Europe and even more so in the industrial area. We have used this technique to modelise and simulate the behaviour of a turbocharged six cylinder (mid-range) Diesel engine.