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The TTA-Group is a consortium which promotes cross-industry transfer of know-how and experience in the area of safety-critical communication. In this paper we outline the activities of TTA-Group's Steer-by-Wire Working Group, which focuses on electro-hydraulic and electro-mechanic steering systems without mechanical backup. The major requirements and advantages of Steer-by-Wire systems are pointed out and specific aspects for off-highway vehicles with on-road use are explained. Furthermore the organizational structure of the Steer-by-Wire Working group, as well as a road map towards a reference architecture are laid out and an outlook for the next steps will be given.

Today's Automotive ECU development is a global engineering exercise. It requires efficient planning, design and implementation. Time to market, innovative customer functions and cost effective design are key to success. Not only the technical realization with compressed time schedules and frequent change requests, but also the documentation, and the proof of compliance to ISO-26262 requires efficient solutions to be applied. Key to successful ECU development of complex safety critical systems inside a global team is a systematic approach to identify the ideal realization out of multiple design alternatives. This is why TRW Electronics Engineering for its Braking ECU products decided to design the new product generation with the help of Model Based System Engineering methods (MBSE).

The development of Steer-by-Wire (SbW) systems for on-road use is a challenging task. In a joint industry effort several companies have teamed up in the TTA-Group SbW Working Group to develop an architectural cookbook for SbW. The working group started with the development of a concept document. It adopts IEC 61508 for the development of a reference SbW architecture for on-road use. The main focus of the working group will be achieved in a second step where common parts of the electronic architecture will be developed.