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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.

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.