Model-Based Analysis for Safety Critical Software

• Published in: Computer Safety, Reliability, and Security Vol. 9337; pp. 111 - 120
• Main Authors: Gulan, Stefan, Harnisch, Jens, Johr, Sven, Kretschmer, Roberto, Rieger, Stefan, Zalman, Rafael
• Format: Book Chapter
• Language: English
• Published: Switzerland Springer International Publishing AG 2015; Springer International Publishing
• Series: Lecture Notes in Computer Science
• Subjects: AUTOSAR; Computer programming / software development; Formal methods; Functional safety; ISO 26262; Model checking; Model-based testing; Programming & scripting languages: general; Safety analysis; Software Engineering
• ISBN: 9783319242545; 3319242547
• ISSN: 0302-9743; 1611-3349
• DOI: 10.1007/978-3-319-24255-2_9

Safety-relevant software developed within the automotive domain is subject to the safety standard ISO 26262. In particular, a supplier must show that implemented safety mechanisms sufficiently address relevant failure modes. This involves complex and costly testing procedures. We introduce an early analysis approach for safety mechanisms implemented in safety-relevant software by combining model checking and model-based testing. Model checking is applied to verify the correctness of an abstract amodel of the system under test. The verified model is then used to automatically generate tests for the verification of the implemented Safety Elements. The approach has been evaluated in an industrial case study, addressing Analogue Digital Converters as part of the motor control within a hybrid electric vehicle. The results suggest that our approach allows to create high quality test suites. In addition, the test model helps to reduce misunderstandings due to imprecise specification of safety mechanisms.