Effective Functional Safety Concept Generation in the Context of ISO 26262

Sexton, Darren; Priore, Antonio; Botham, John

doi:10.4271/2014-01-0207

Cited by 11 publications

(4 citation statements)

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“…The seminal work of Rechtin and Meier [26] describe the use of heuristics as a basic tool in architecting and works such as [27] have established the effectiveness of using heuristics and the prevalence of such methods. The authors agree with the view of Sexton [28] in that balance is needed in the speed of concept design and the assurance of functional safety and see the method proposed in this paper as a step forward to have a fast and inexpensive design concept without compromising on functional safety.…”

Section: Related Worksupporting

confidence: 80%

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

Mohan¹,

Törngren²,

Behere³

2017

SAE Technical Paper Series

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With the advent of ISO 26262 there is an increased emphasis on top-down design in the automotive industry. While the standard delivers a best practice framework and a reference safety lifecycle, it lacks detailed requirements for its various constituent phases. The lack of guidance becomes especially evident for the reuse of legacy components and subsystems, the most common scenario in the cost-sensitive automotive domain, leaving vehicle architects and safety engineers to rely on experience without methodological support for their decisions. This poses particular challenges in the industry which is currently undergoing many significant changes due to new features like connectivity, servitization, electrification and automation. In this paper we focus on automated driving where multiple subsystems, both new and legacy, need to coordinate to realize a safety-critical function.This paper introduces a method to support consistent design of a work product required by ISO 26262, the Functional Safety Concept (FSC). The method arises from and addresses a need within the industry for architectural analysis, rationale management and reuse of legacy subsystems. The method makes use of an existing work product, the diagnostic specifications of a subsystem, to assist in performing a systematic assessment of the influence a human driver, in the design of the subsystem. The output of the method is a report with an abstraction level suitable for a vehicle architect, used as a basis for decisions related to the FSC such as generating a Preliminary Architecture (PA) and building up argumentation for verification of the FSC.The proposed method is tested in a safety-critical braking 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 for automated driving functions while designing the PA and FSC, (iii) the parallelization of work across the organization on the basis of expertise, and (iv) the applicability of the method across all types of subsystems. RQ: How can detailed domain specific information about legacy subsystems be best extracted from the platform for the purposes of design of the FSC?The paper addresses this question in two steps, first by defining heuristics to analyse the influence of human vehicle drivers (from here on abbreviated as "driver") on the subsystem, in the form of a structured method. The second step is to collect the information generated by the domain expert's application of the method in a subsystem report. The subsystem report serves as a basis for architects to make their decisions. The paper further applies this method as part of an industrial case study using one of the most critical subsystems in the vehicle, the service brakes, and demonstrates the effectiveness of the method in providing relevant critical information to the system architects.The method thus aims to provide a well-defined baseline of information from the platform, ab...

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Section: Related Worksupporting

confidence: 80%

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

Mohan¹,

Törngren²,

Behere³

2017

SAE Technical Paper Series

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“…The authors develop requirements for the electric power supply and communication system of safety-critical components and propose a technical architectural solution. Sexton et al (2014) apply safety analysis techniques on a shift-by-wire system to derive requirements from potential safety goal violations. Krithivasan et al (2015) systematically develop functional safety requirements from a set of safety goals for an electronic throttle controller using a process-modelling concept.…”

Section: Related Workmentioning

confidence: 99%

Functional Safety Concept Generation within the Process of Preliminary Design of Automated Driving Functions at the Example of an Unmanned Protective Vehicle

Graubohm¹,

Stolte²,

Bagschik³

et al. 2019

Proc. Int. Conf. Eng. Des.

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Structuring the early design phase of automotive systems is an important part of efficient and successful development processes. Today, safety considerations (e.g., the safety life cycle of ISO 26262) significantly affect the course of development. Preliminary designs are expressed in functional system architectures, which are required to form safety concepts. Thus, mapping tasks and work products to a reference process during early design stages is an important part of structuring the system development. This contribution describes the systematic creation and notation of the functional safety concept within the concept phase of development of an unmanned protective vehicle within the research project aFAS. Different stages of preliminary design and dependencies between them are displayed by the work products created and used. The full set of functional safety requirements and an excerpt of the safety argument structure of the SAE level 4 application are presented.

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“…Moreover, [2] also explains in detail the development of a steer-by-wire system including functional requirements and functional architecture on system and sub-system levels. [17] and [12] deal with formulating functional safety requirements from which functional safety architectures are developed. Another paper worth mentioning is [7] which describes the development of an automotive functional safety case in SysML and Goal Structured Notation environments.…”

Section: Related Workmentioning

confidence: 99%

Development and Validation of Functional Model of a Cruise Control System

Varadarajan¹,

Romijn²,

Oosthoek³

et al. 2016

Electron. Proc. Theor. Comput. Sci.

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Modern automobiles can be considered as a collection of many subsystems working with each other to realize safe transportation of the occupants. Innovative technologies that make transportation easier are increasingly incorporated into the automobile in the form of functionalities. These new functionalities in turn increase the complexity of the system framework present and traceability is lost or becomes very tricky in the process. This hugely impacts the development phase of an automobile, in which, the safety and reliability of the automobile design should be ensured. Hence, there is a need to ensure operational safety of the vehicles while adding new functionalities to the vehicle. To address this issue, functional models of such systems are created and analysed. The main purpose of developing a functional model is to improve the traceability and reusability of a system which reduces development time and cost. Operational safety of the system is ensured by analysing the system with respect to random and systematic failures and including safety mechanism to prevent such failures. This paper discusses the development and validation of a functional model of a conventional cruise control system in a passenger vehicle based on the ISO 26262 Road Vehicles -Functional Safety standard. A methodology for creating functional architectures and an architecture of a cruise control system developed using the methodology are presented.

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Effective Functional Safety Concept Generation in the Context of ISO 26262

Cited by 11 publications

References 0 publications

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

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

Functional Safety Concept Generation within the Process of Preliminary Design of Automated Driving Functions at the Example of an Unmanned Protective Vehicle

Development and Validation of Functional Model of a Cruise Control System

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