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With the advent of ISO 26262 there is an increased emphasis on top-downdesign in the automotive industry. ISO 26262 lacks detailed requirements forits various constituent phases. The lack of guidance becomes evident for thereuse of legacy components and subsystems, leaving vehicle architects andsafety engineers to rely on experience without methodological support for theirdecisions. This poses challenges in the industry which is undergoing manysignificant changes due to new features like connectivity, electrification andautomation. Here we focus on automated driving where multiple subsystems, bothnew and legacy, need to coordinate to realize a safety-critical function. Thispaper introduces a method to support consistent design of an ISO 26262 workproduct, the Functional Safety Concept (FSC). The method addresses a needwithin the industry for architectural analysis, rationale management and reuseof legacy subsystems. The method makes use of an existing work product, thediagnostic specifications of a subsystem, to assist in performing a systematicassessment of the influence a human driver, in the design of the subsystem. Theoutput of the method is a report with an abstraction level suitable for avehicle architect, used as a basis for decisions related to the FSC such asgenerating a Preliminary Architecture (PA) and building up argumentation forverification of the FSC. The proposed method is tested in a safety-criticalbraking subsystem at one of the largest heavy vehicle manufacturers in Sweden,Scania C.V. AB. The results demonstrate the benefits of the method including(i) reuse of pre-existing work products, (ii) gathering requirements forautomated driving functions while designing the PA and FSC, (iii) theparallelization of work across the organization on the basis of expertise, and(iv) the applicability of the method across all types of subsystems.

A Method towards the Systematic Architecting of Functionally Safe Automated Driving -- Leveraging Diagnostic Specifications for FSC design