Search Results

New drive concepts as well as advanced driver assistance systems and revised basic functions belong to the main innovation areas in today's automotive industry. Since thereby more and more electric / electronic components are integrated in modern passenger cars, the complexity is steadily increasing. Additionally, a crucial part of the innovations focuses on active and passive safety. Together, this creates tough demands on systems reliability and functionality which influence the development. Addressing the development process of electric / electronic components for passenger cars, the ISO 26262 “Road vehicles - Functional safety” came into effect in November 2011 ([1]).

The Integrated Project Speeds has developed a contract based approach to systems engineering and analysis of safety relevant applications. The paper discusses the usage of this approach for ISO CD 26262 compliant construction of safety cases, using so called safety-patterns in formalizing safety contracts. This approach enforces a characterization of allowed environment of developed items, and characterizes the possibly mode-dependent failure-propagation behavior as well as guaranteed nominal and degraded functionality within promises of such safety constructs. The method is supported by various analysis tools. These allow in particular to assess, whether a partitioning of system safety requirements to components requirements, all expressed in terms of safety contracts, are sufficient to establish system level safety requirements.