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An innovative approach for the simulation of the interaction between the software to be implemented in the Electronic Control Unit (ECU) of the vehicle and the engine is described. The aim was to perform a complete simulation of the engine coupled with the ECU, in order to support multi-disciplinary development and to enable engineers to verify and validate control models in early development stages, reducing costs by performing fewer live engine tests. Also, the simultaneous simulation of the models allows to study their interaction, thus allowing an early exploration of the possible design choices over multiple disciplines. A first prototype of the coupling has been implemented, with an emphasis on realizing a common notion of time and a proper treatment of data exchange between the control model and the engine model.