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Title Building a safety case for a small sized product line of Fuel Level Display Systems
URL
Publication Date
Discipline/Department Design and Engineering
University/Publisher Mälardalen University
Abstract ISO 26262 is an international standard valid for the automotive domain. It regulates all the activities to perform for developing safety critical systems in such domain. To be compliant with ISO 26262, all the required activities have to be performed and all the required work products have to be provided. Furthermore, in addition to develop a system in a safe way, following the safety standard guidelines, the achieved safety has also to be demonstrated. This is done through a safety case, a structured argument showing that a system is acceptably safe. ISO 26262 focuses on single systems and does not contain guidelines for product lines. Product line engineering is a valid approach to systematize reuse, aimed at reducing the effort needed to develop similar systems. But, it loses its strength when dealing with safety critical systems, since it is not aligned with safety standards. Hence, when developing a safety critical product line in the automotive domain, the work products required by ISO 26262 have to be provided every time from scratch, including the safety case, for each single system of the product line. This thesis work focuses on providing an approach for building and modeling a safety case for safety critical product lines in the automotive domain. Furthermore, the considered product line engineering approach is aligned with ISO 26262, through the inclusion of safety activities in the product line development process. Giving in this way, the concrete possibility to overtake to the current limitations, reducing the effort needed to develop and certificate each single system of a safety critical product line. To illustrate the validity of the proposed approach a safety critical product line developed by Scania is used as case study.
Subjects/Keywords ISO 26262; Safety-critical product lines; Reusability; Variability management; Families of safety cases; GSN for product lines; Software Engineering; Programvaruteknik
Language en
Country of Publication se
Record ID oai:DiVA.org:mdh-22373
Repository diva
Date Indexed 2020-01-03

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…intended in ISO 26262, the safety case is aimed at showing the safety of one single system, and not of product lines that are families of systems having some common functionalities and other variable ones, which distinguish each single system. Thanks to…

…Finally, the paper VROOM & cC: a Method to Build Safety Cases for ISO 26262-compliant Product Lines [4] stemmed from this thesis work, and it has been accepted at the Next Generation of System Assurance Approaches for Safety-Critical Systems…

…2.3 the concept of safety case is presented; In Section 2.4 safety case modeling is described; In Section 2.5 product lines and the product line engineering approach is described; In Section 2.6 feature diagrams are explained; In Section 2.7 activity…

…effort required during the domain engineering phase will be significant, but in the long run the time needed to create new systems or update existing ones will be significantly decreased. Product lines can also be developed in the context of safety…

…critical systems (Section 2.1). In that case they are called safety critical product lines, and as such there is need to perform all the safety activities necessary for safety critical systems. 2.6 Feature diagrams Feature diagrams is a means…

lines In EAST-ADL [38] the block definition and internal block diagram has been used also to model product lines. In Figure 16 an example of how these diagrams are used to represent variability for product lines is shown. Figure 16: Example of…

…measures are necessary to avoid a system failure or make it more difficult to occur. 2.8.3 Hazard Analysis for product lines The product line hazard analysis [41] is slightly different compared with the hazard analysis for single products. For…

…analysis techniques for product lines can be found in [42]. In the next section an FTA approach for product lines is described. 2.8.3.1 Product line Fault Tree Analysis Product lines are set of similar systems and as such the fault tree…

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