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Virtual prototyping and concurrent engineering is becoming a common practice due to time and cost constraints in automotive industry. Analysing interaction of mechatronic systems consisting of control and multiple physical domains becomes a major challenge for the product design due to the domain specific representations. In this respect, model exchange between different domains is essential. The design of the Common Rail injection system exposes all these deficiencies. On the example of the virtual prototyping of the Common Rail system, this paper gives a pragmatic approach to overcome the problem of model exchange. Hereby, the standardised simulation language VHDL-AMS is explicitly used as a unified basis.