Bosch GmbH , DaimlerChrysler , Opel , Siemens , and Volkswagen Group ) and the University of Karlsruhe . In 1994, the French cars manufacturers Renault and PSA Peugeot Citroën , which had a similar project called VDX (Vehicle Distributed eXecutive), joined the consortium. Therefore, the official name is OSEK/VDX. OSEK