ISO 26262-3:2018: Concept phase

Define malfunctions and derive hazardous scenarios for risk assessment in ISO 26262. Assess scenarios using severity, exposure, and controllability to derive safety goals and support a robust product liability position.

Assess hazard scenarios using the ISO 26262 parameters: exposure, controllability, and severity; exposure covers duration and frequency, and these parameters are explained in detail.

Explore the ISO 26262 exposure parameter, distinguishing duration and frequency across categories e0 to e4 with examples for trucks, buses, motorcycles, and road conditions.

Evaluate hazardous scenarios using controllability, categorize as C0 to C3, and assign a QM rating; illustrate with examples like radio volume increases and unintended window closing.

Describe the severity parameter in ISO 26262-3 risk assessment, detailing AIS categories from zero to six and how injuries influence the QRM rating and overall quality management.

Determine the ASIL using the ISO 26262 risk matrix by rating exposure, severity, and controllability; for motorcycles, derive an ACL, noting changes can shift it.

Define top level safety goals for each malfunction by selecting worst case scenarios and ACL ratings, then derive system, hardware, and software requirements to cover all safety relevant aspects.

Conclude the hazard analysis and risk assessment with signatures from all participants. Ensure independence level three from a different department, with more than two participants, as Hara informs ASAL determination.

Refine the safety goals into a functional safety concept by detailing function, characteristics, and attributes, deriving requirements, and defining fault tolerance and the fault time interval.

Define functional safety requirements derived from safety goals and allocate them to components and external measures, using decomposition to distribute asil requirements and ensure independence analyses.

Define the functional safety architecture at the vehicle level by outlining function units, item definitions, and block diagrams, specify interactions between units, and allocate functional safety requirements and safety goals.

End concept phase with a review of functional safety concept, assign independence level from highest ASL based on confirmation measure, and anchor development phase and safety lifecycle.

Develop hazard analysis and risk assessment to shape the functional safety concept. Explore the history and general aspects of functional safety and related ISO 2626 two topics.

Bonus lecture offers extra context on the ISO 26262-3:2018 concept phase, expanding understanding of the course's foundational topics.