Bachelor and Master Theses

Title: Building a Safety Case in Compliance with ISO 26262 for Fuel Level Estimation and Display System
Subject: Computer Science
Level: Advanced
Description: Description:
Nowadays, road vehicles, including trucks, are characterized by an increased complexity due to a greater variety of software, and a greater number of sensors and actuators. As a consequence, there is an increased risk in terms of software or hardware failures that could lead to unacceptable hazards. Thus safety, more precisely functional safety, is a crucial property that must be ensured to avoid or mitigate these potential unacceptable hazards. In the automotive domain, recently, the ISO-26262 safety standard has been introduced to provide appropriate development processes, requirements and safety integrity levels.
To be released on the market, systems must be certified: proofs that the systems are acceptably safe must be provided in terms of a structured argument, known as safety case, which inter-relates evidence and claims. A safety case is expected to include two types of arguments: process and product-based arguments.
Certification authorities are in charge of evaluating the validity of such structured arguments.
In the automotive domain, certification and compliance with the standard ISO-26262 is becoming mandatory.
Quoting from the standard: “ISO-26262 is intended to be applied to safety-related systems that include one or more electrical and/or electronic (E/E) systems and that are installed in series production passenger cars with a maximum gross vehicle mass up to 3 500 kg.” By now, trucks do not have to be compliant with the standard. However, it is likely that by 2016 they will have to.
Scania is one of the leading manufacturers of heavy trucks, buses, coaches and engines. To be ready by 2016, Scania is interested in investigating ISO-26262 as well as safety case provision. Thus this thesis focuses on the provision of a safety case in the context of ISO-26262 for fuel level display system, which is one of the safety-critical systems in Scania.

Tasks included:
- Reading the system documentation and interviewing Scania experts and engineers to achieve the necessary understanding of the system to be able to define the item, identify the safety goals, the evidence concerning its functional safety, etc.. and thus identifying/providing product-based arguments.
- Study previous work about gap analysis between ISO-26262 and the development process in Scania in order to collect information about the development process followed by Scania and thus identifying process-based arguments.
- Investigation and analysis of the approaches that can be used for building the safety case. Selection of one approach.
- Building a safety case for the intended system by using the selected approach.

Required outcome:
A thesis report that include:
- An analysis about the approaches used for building a safety case, what is good and or bad about these approaches, and what are the challenges that appear when building safety cases.
- A safety case for fuel level display system.

References to start with:
• INTERNATIONAL STANDARD ISO-26262, November, 2011
• N. Leveson. White Paper on The Use of Safety Cases in Certification and Regulation, updated May 6, 2012.
• D. Jackson, M. Thomas, L. I. Millett (eds). Software for Dependable Systems: Sufficient Evidence? National Research Council, Committee on Certifiably Dependable Software Systems, 2007.
• F. Redmill. Grasping at the Shadow of Safety and Missing the Substance. Invited paper at Sixth International Symposium on Programmable Electronic Systems in Safety Related Applications, Cologne, 4-5 May 2004.
• I. Habli, T. P. Kelly. Process and Product Certification Arguments - Getting the Balance Right Workshop on Innovative Techniques for Certification of Embedded Systems. In proceedings of 12th IEEE Real-Time and Embedded Technology and Applications Symposium, San Jose, California, United States,4 -7 April, 2006.
• W.S. Greenwell, J. C. Knight, C.M. Holloway, J.J. Pease. A Taxonomy of Fallacies in System Safety Arguments. Proceedings of the 24th International System Safety Conference, Albuquerque, New Mexico, 31 July - 4 August 2006.
• C.M. Holloway. Safety Case Notations: Alternatives for the Non-Graphically Inclined? In C.W. Johnson and P. Casely (eds.), Proceedings of the IET 3rd International Conference on System Safety, IET Press, Savoy Place, London, 2008.
Company: Scania AB, kontaktperson: Mattias Nyberg
Prel. end date: 2014-01-27
Presentation date: 2013-09-13
Student: Raghad Dardar
IDT supervisor: Barbara Gallina, 021-101631
Examinator: Kristina Lundqvist
Kristina Lundqvist, +46 (0)21 101428

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2014-01-27, 11:59

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