1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 26262-4:2011Road vehicles FunctionalsafetyPart 4: Product development at the systemlevelBS ISO 26262-4:2011 BRITISH STANDARDNational forewordThis British Standard is the U
2、K implementation of ISO 26262-4:2011.The UK participation in its preparation was entrusted to TechnicalCommittee AUE/16, Electrical and electronic equipment.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include a
3、ll the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 62306 6ICS 43.040.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and St
4、rategy Committee on 30 November 2011.Amendments issued since publicationDate Text affectedBS ISO 26262-4:2011Reference numberISO 26262-4:2011(E)ISO 2011INTERNATIONAL STANDARD ISO26262-4First edition2011-11-15Road vehicles Functional safety Part 4: Product development at the system level Vhicules rou
5、tiers Scurit fonctionnelle Partie 4: Dveloppement du produit au niveau du systme BS ISO 26262-4:2011ISO 26262-4:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electr
6、onic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.or
7、g Web www.iso.org Published in Switzerland ii ISO 2011 All rights reservedBS ISO 26262-4:2011ISO 26262-4:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword . v Introduction vi 1 Scope 1 2 Normative references 2 3 Terms, definitions and abbreviated terms 2 4 Requirements for compliance 2
8、4.1 General requirements . 2 4.2 Interpretations of tables 3 4.3 ASIL-dependent requirements and recommendations . 3 5 Initiation of product development at the system level 3 5.1 Objectives 3 5.2 General . 4 5.3 Inputs to this clause 6 5.4 Requirements and recommendations . 6 5.5 Work products . 6 6
9、 Specification of the technical safety requirements . 7 6.1 Objectives 7 6.2 General . 7 6.3 Inputs to this clause 7 6.4 Requirements and recommendations . 7 6.5 Work products . 10 7 System design . 10 7.1 Objectives 10 7.2 General . 11 7.3 Inputs to this clause 11 7.4 Requirements and recommendatio
10、n . 11 7.5 Work products . 16 8 Item integration and testing . 16 8.1 Objectives 16 8.2 General . 16 8.3 Inputs to this clause 16 8.4 Requirements and recommendation . 17 8.5 Work products . 25 9 Safety validation 25 9.1 Objectives 25 9.2 General . 25 9.3 Inputs to this clause 26 9.4 Requirements an
11、d recommendation . 26 9.5 Work products . 27 10 Functional safety assessment . 28 10.1 Objectives 28 10.2 General . 28 10.3 Inputs to this clause 28 10.4 Requirements and recommendation . 28 10.5 Work products . 28 11 Release for production . 28 BS ISO 26262-4:2011ISO 26262-4:2011(E) iv ISO 2011 All
12、 rights reserved11.1 Objectives .28 11.2 General 29 11.3 Inputs to this clause 29 11.4 Requirements and recommendations .29 11.5 Work products 30 Annex A (informative) Overview and document flow of product development at the system level .31 Annex B (informative) Example contents of hardware-softwar
13、e interface 33 Bibliography 36 BS ISO 26262-4:2011ISO 26262-4:2011(E) ISO 2011 All rights reserved vForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally
14、carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the wo
15、rk. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare Inte
16、rnational Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of t
17、he elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 26262-4 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical and electronic equipment. ISO 26262 consists of t
18、he following parts, under the general title Road vehicles Functional safety: Part 1: Vocabulary Part 2: Management of functional safety Part 3: Concept phase Part 4: Product development at the system level Part 5: Product development at the hardware level Part 6: Product development at the software
19、level Part 7: Production and operation Part 8: Supporting processes Part 9: Automotive Safety Integrity Level (ASIL)-oriented and safety-oriented analyses Part 10: Guideline on ISO 26262 BS ISO 26262-4:2011ISO 26262-4:2011(E) vi ISO 2011 All rights reservedIntroduction ISO 26262 is the adaptation of
20、 IEC 61508 to comply with needs specific to the application sector of electrical and/or electronic (E/E) systems within road vehicles. This adaptation applies to all activities during the safety lifecycle of safety-related systems comprised of electrical, electronic and software components. Safety i
21、s one of the key issues of future automobile development. New functionalities not only in areas such as driver assistance, propulsion, in vehicle dynamics control and active and passive safety systems increasingly touch the domain of system safety engineering. Development and integration of these fu
22、nctionalities will strengthen the need for safe system development processes and the need to provide evidence that all reasonable system safety objectives are satisfied. With the trend of increasing technological complexity, software content and mechatronic implementation, there are increasing risks
23、 from systematic failures and random hardware failures. ISO 26262 includes guidance to avoid these risks by providing appropriate requirements and processes. System safety is achieved through a number of safety measures, which are implemented in a variety of technologies (e.g. mechanical, hydraulic,
24、 pneumatic, electrical, electronic, programmable electronic) and applied at the various levels of the development process. Although ISO 26262 is concerned with functional safety of E/E systems, it provides a framework within which safety-related systems based on other technologies can be considered.
25、 ISO 26262: a) provides an automotive safety lifecycle (management, development, production, operation, service, decommissioning) and supports tailoring the necessary activities during these lifecycle phases; b) provides an automotive-specific risk-based approach to determine integrity levels Automo
26、tive Safety Integrity Levels (ASIL); c) uses ASILs to specify applicable requirements of ISO 26262 so as to avoid unreasonable residual risk; d) provides requirements for validation and confirmation measures to ensure a sufficient and acceptable level of safety being achieved; e) provides requiremen
27、ts for relations with suppliers. Functional safety is influenced by the development process (including such activities as requirements specification, design, implementation, integration, verification, validation and configuration), the production and service processes and by the management processes
28、. Safety issues are intertwined with common function-oriented and quality-oriented development activities and work products. ISO 26262 addresses the safety-related aspects of development activities and work products. Figure 1 shows the overall structure of this edition of ISO 26262. ISO 26262 is bas
29、ed upon a V-model as a reference process model for the different phases of product development. Within the figure: the shaded “V”s represent the interconnection between ISO 26262-3, ISO 26262-4, ISO 26262-5, ISO 26262-6 and ISO 26262-7; the specific clauses are indicated in the following manner: “m-
30、n”, where “m” represents the number of the particular part and “n” indicates the number of the clause within that part. EXAMPLE “2-6” represents Clause 6 of ISO 26262-2. BS ISO 26262-4:2011ISO 26262-4:2011(E) ISO 2011 All rights reserved vii3. Concept phase2. Management of functional safety2-5 Overa
31、ll safetymanagement2-6Safetymanagement during the concept phase and the product development 7. Production and operation6-5Initiation of product development at the software level6-7Software architectural design6-8Software unit design and implementation6-9Software unit testing6-10Software integration
32、and testing 6-11 Verification of software safetyrequirements5-5Initiation of product development at the hardware level5-6Specification of hardware safetyrequirements5-7Hardware design5-8Evaluation of the hardware architecturalmetrics5-10Hardware integration and testing2-7Safetymanagement after the i
33、tems release for production3-6 Initiation of the safetylifecycle1. Vocabulary3-5 Item definition3-7 Hazard analysis andrisk assessment3-8 Functional safetyconcept7-6 Operation, service (maintenance and repair), and decommissioning7-5 Production8. Supporting processes8-5Interfaces within distributed
34、developments8-6Specification and managementof safetyrequirements8-8Change management8-9Verification8-7Configuration management4. Product development at the system level4-5Initiation of product development at the system level4-7System design 4-8Item integration and testing4-9Safetyvalidation4-10Funct
35、ional safetyassessment4-11Release for production6. Product development at thesoftware level5. Product development at thehardware level5-9Evaluation of the safetygoal violations due to random hardware failures4-6Specification of the technical safetyrequirements9. ASIL-oriented and safety-oriented ana
36、lyses9-5Requirements decomposition with respect to ASIL tailoring9-6Criteria for coexistence of elements8-10Documentation8-11Confidence in the use of software tools8-13Qualificationof hardware components8-14Proven in use argument8-12Qualificationof software components9-7Analysis of dependent failure
37、s9-8Safetyanalyses10. Guideline on ISO26262Figure 1 Overview of ISO 26262 BS ISO 26262-4:2011BS ISO 26262-4:2011INTERNATIONAL STANDARD ISO 26262-4:2011(E) ISO 2011 All rights reserved 1Road vehicles Functional safety Part 4: Product development at the system level 1 Scope ISO 26262 is intended to be
38、 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. ISO 26262 does not address unique E/E systems in special purpose vehicles such as vehicl
39、es designed for drivers with disabilities. Systems and their components released for production, or systems and their components already under development prior to the publication date of ISO 26262, are exempted from the scope. For further development or alterations based on systems and their compon
40、ents released for production prior to the publication of ISO 26262, only the modifications will be developed in accordance with ISO 26262. ISO 26262 addresses possible hazards caused by malfunctioning behaviour of E/E safety-related systems, including interaction of these systems. It does not addres
41、s hazards related to electric shock, fire, smoke, heat, radiation, toxicity, flammability, reactivity, corrosion, release of energy and similar hazards, unless directly caused by malfunctioning behaviour of E/E safety-related systems. ISO 26262 does not address the nominal performance of E/E systems
42、, even if dedicated functional performance standards exist for these systems (e.g. active and passive safety systems, brake systems, Adaptive Cruise Control). This part of ISO 26262 specifies the requirements for product development at the system level for automotive applications, including the foll
43、owing: requirements for the initiation of product development at the system level, specification of the technical safety requirements, the technical safety concept, system design, item integration and testing, safety validation, functional safety assessment, and product release. BS ISO 26262-4:2011I
44、SO 26262-4:2011(E) 2 ISO 2011 All rights reserved2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including an
45、y amendments) applies. ISO 26262-1:2011, Road vehicles Functional safety Part 1: Vocabulary ISO 26262-2:2011, Road vehicles Functional safety Part 2: Management of functional safety ISO 26262-3:2011, Road vehicles Functional safety Part 3: Concept phase ISO 26262-5:2011, Road vehicles Functional saf
46、ety Part 5: Product development at the hardware level ISO 26262-6:2011, Road vehicles Functional safety Part 6: Product development at the software level ISO 26262-7:2011, Road vehicles Functional safety Part 7: Production and operation ISO 26262-8:2011, Road vehicles Functional safety Part 8: Suppo
47、rting processes ISO 26262-9:2011, Road vehicles Functional safety Part 9: Automotive Safety Integrity Level (ASIL)-oriented and safety-oriented analyses 3 Terms, definitions and abbreviated terms For the purposes of this document, the terms, definitions and abbreviated terms given in ISO 26262-1:201
48、1 apply. 4 Requirements for compliance 4.1 General requirements When claiming compliance with ISO 26262, each requirement shall be complied with, unless one of the following applies: a) tailoring of the safety activities in accordance with ISO 26262-2 has been planned and shows that the requirement
49、does not apply, or b) a rationale is available that the non-compliance is acceptable and the rationale has been assessed in accordance with ISO 26262-2. Information marked as a “NOTE” or “EXAMPLE” is only for guidance in understanding, or for clarification of the associated requirement, and shall not be interpreted as a requirement itself or as complete or exhaustive. The results of safety activities are given as work products. “Prerequisites” are informati
