This paper presents the AEE project (Embedded Electronic Architecture), a French cooperative research and development program whose purpose is to specify new solutions for in-vehicle embedded system development. The Architecture Implementation Language (AIL_Transport) has been defined to specify and describe precisely any vehicle electronic architecture. This language supports the AEE design process, and is used by all designers as the backbone of the architecture development. Finally it is used to define reusable architecture objects. || Ce papier présente le projet AEE (Architecture Electronique Embarquée), un programme coopératif de recherche et développement dont le but est la spécification de nouvelles solutions pour le développement de système embarqué dans l'automobile. Le langage