Modern passenger cars offer a vast number of driver assistance systems and complex functionalities. These modern driving functionalities do incorporate more and more safety relevant functions (e.g. drive-by-wire, semi-autonomous driving) which have to be implemented with respect to the requirements for functional safety originating from international standards like ISO 26262. With the increasing complexity of driving functionalities the according safety concepts are becoming equally complex. To meet the requirements in the automotive domain for cost efficiency, weight and time to market these safety concepts may not be implemented according to the conventional approaches e.g. known from the domain of airborne systems. There the approach of multiple redundancies is not a valid solution. Instead, an intelligent approach has to be used, a new kind of future safety concepts. As an example this paper takes a closer look at a steer-by-wire system. The steering rod is replaced by a set of sensors connected to the steering wheel and an actuator driving the steering rack. These two components are connected by an E/E-system. The future safety concept for this steer-by-wire system might comprise of a monitoring function that in case of a fault within the E/E system switches over to a simple mechanical fallback system. While the E/E part of this steer-by-wire system can implement all future sophisticated functionalities, the mechanical part can rely on 10 decades of engineering experience and thus can be based on a cost effective design. Over all the steer-by-wire system is an elegant and safe approach to introduce collaborative forward-looking new functionalities needed to implement future driver assistance systems. For further development this might be an intermediate step towards later systems which only consist of E/E components. However for such systems there is the need for more field data and engineering experience, which can be gained in the meantime by hybrid systems.
Intelligent functional safety approaches for future driver assistance systems
2011
7 Seiten, 5 Bilder, 5 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
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