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GB/T 34590.10-2022: Road vehicles - Functional safety - Part 10: Guideline Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 34590.10: Historical versions
Similar standardsGB/T 34590.10-2022: Road vehicles - Functional safety - Part 10: Guideline---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT34590.10-2022GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.040 CCS T 35 Replacing GB/T 34590.10-2017 Issued on. DECEMBER 30, 2022 Implemented on. JULY 1, 2023 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 4 Introduction... 7 1 Scope... 11 2 Normative References... 12 3 Terms and Definitions... 12 4 Key Concepts of GB/T 34590... 12 4.1 Functional safety for automotive systems (relationship with GB/T 20438)... 12 4.2 Item, system, element, component, hardware part and software unit... 15 4.3 Relationship between faults, errors and failures... 16 4.4 FTTI and emergency operation tolerant time interval... 17 5 Selected Topics Regarding Safety Management... 21 5.1 Work product... 21 5.2 Confirmation measures... 22 5.3 Understanding of safety cases... 25 6 Concept Phase and System Development... 27 6.1 General... 27 6.2 Example of hazard analysis and risk assessment... 27 6.3 An observation regarding controllability classification... 28 6.4 External measures... 28 6.5 Example of combining safety goals... 30 7 Safety Process Requirement Structure... 31 8 Concerning Hardware Development... 34 8.1 The classification of random hardware faults... 34 8.2 Example of residual failure rate and local single-point fault metric evaluation... 40 8.3 Further explanation concerning hardware... 54 8.4 PMHF units — Average probability per hour... 63 9 Safety Element out of Context... 66 9.1 Safety Element out of Context development... 66 9.2 Use cases... 68 10 An Example of Proven in Use Argument... 77 10.1 General... 77 10.2 Item definition and definition of the proven in use candidate... 77 10.3 Change analysis... 78 10.4 Target values for proven in use... 78 11 Concerning ASIL Decomposition... 79 11.1 Objective of ASIL decomposition... 79 11.2 Description of ASIL decomposition... 79 11.3 An example of ASIL decomposition... 80 12 Guidance for System Development with Safety-Related Availability Requirements... 83 12.1 Introduction... 83 12.2 Notes on concept phase when specifying fault tolerance... 84 12.3 Availability considerations during hardware design phase... 94 12.4 Software development phase... 97 13 Remark on “Confidence in the Use of Software Tools”... 97 14 Guidance on Safety-Related Special Characteristics... 99 14.1 General... 99 14.2 Identification of safety-related special characteristics... 100 14.3 Specification of the control measures of safety-related special characteristics... 101 14.4 Monitoring of the safety-related special characteristics... 101 Annex A (Informative) Fault Tree Construction and Applications... 103 Bibliography... 106ForewordThis document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents. This document is Part 10 of GB/T 34590 Road Vehicles - Functional Safety. GB/T 34590 has issued the following parts. --- 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 Level; --- Part 7.Production, Operation, Service and Decommissioning; --- Part 8.Supporting Processes; --- Part 9.Automotive Safety Integrity Level (ASIL)-oriented and Safety-oriented Analyses; --- Part 10.Guideline; --- Part 11.Guidelines on Applications to Semiconductors; --- Part 12.Adaptation for Motorcycles. This Document replaced GB/T 34590.10-2017 Road vehicles - Functional safety - Part 10. Guideline. Compared with GB/T 34590.10-2017, the major technical changes of this Document are as follows besides the structural adjustment and editorial modifications. --- Change the scope of application of the standard from "mass-produced passenger cars" into "mass-produced road vehicles other than mopeds"; and modify the description of the scope (see Clause 1 of this Edition; Clause 1 of 2017 Edition); --- Add "FTTI and emergency operation fault tolerance time interval" (see 4.4 of this Edition); --- Change the description of the general provisions of the accreditation measures (see 5.2.1 of this Edition; 5.2.1 of 2017 Edition); --- Change the description of functional safety assessment (see 5.2.2 of this Edition; 5.2.2 of 2017 Edition); --- Change the description of the understanding of the safety profile (see 5.3 of this Edition; 5.3 of 2017 Edition); --- Change the description in Figure 8 (see Figure 8 of this Edition; Figure 7 of 2017 Edition); --- Change the description in Figure 9 (see Figure 9 of this Edition; Figure 8 of 2017 Edition); --- Change the description of the consideration of exposure duration in the calculation of the probability measure of random hardware failure (PMHF) (see 8.3.2.2 of this Edition; 8.3.3 of 2017 Edition); --- Add "typical dual-point failure mode (intended function and safety mechanism)" (see 8.3.2.3 of this Edition); --- Add "calculation formula" (see 8.3.2.4 of this Edition); --- Add "PMHF unit --- average probability per hour (see 8.4 of this Edition); --- Add "Guidelines for the development of systems with safety-related availability requirements" (see Clause 12 of this Edition); --- Delete Annex A of 2017 edition. This Document modifies and adopts ISO 26262-10.2018 Road Vehicles – Functional Safety – Part 10.Guidelines on ISO 26262. The technical differences and causes between this Document and ISO 26262-10.2018 are as follows. --- Change the subclause structure of 13.3 (see 13.3) [Translator Note. here it shall be 12.3]; so that the subclause structure is more rational. This Document made the following editorial modifications. --- Change the paragraph sequence of the Scope; --- Delete the title of 4.3.1. Please note some contents of this Document may involve patents. The issuing agency of this Document shall not assume the responsibility to identify these patents. This Document was proposed by the Ministry of Industry and Information Technology of PRC. This Document shall be under the jurisdiction of National Technical Committee on Auto of Standardization Administration of China (SAC/TC 114). The historical editions replaced by this Document are as follows. --- GB/T 34590.10-2017 was first-time published in 2017; --- It is first-time revised hereby.1 ScopeThis Document provides an overview of the GB/T 34590 series of standards, as well as giving additional explanations, and is intended to enhance the understanding of the other parts of this series of standards.2 Normative ReferencesThe provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. GB/T 34590.1-2022 Road Vehicles - Functional Safety - Part 1.Vocabulary (ISO 26262-1.2018, MOD)3 Terms and DefinitionsFor the purposes of this Document, the terms and definitions given in GB/T 34590.1-2022 apply.4 Key Concepts of GB/T 34590GB/T 20438, Functional Safety of electrical/electronic/programmable electronic safety-related systems, is designated by IEC as a generic standard and a basic safety publication. This means that industry sectors will base their own standards for functional safety on the requirements of GB/T 20438. In the automotive industry, there are a number of issues with applying GB/T 20438 directly. Some of these issues and corresponding differences in the GB/T 34590 series of standards are described below. The terms item, system, element, component, hardware part and software unit are defined in GB/T 34590.1-2022.Figure 3 shows the relationship of item, system, component, hardware part and software unit. Systematic faults (see GB/T 34590.1-2022, 3.165) are due to design or specification issues; software faults and a subset of hardware faults are systematic. At the component level, each different type of fault can lead to different failures.5 Selected Topics Regarding Safety Management5.1 Work product The documentation of a work product (see GB/T 34590.8-2022, Clause 10) serves as a record of the executed safety activities, safety requirements or of related information. Such documentation is not restricted to any form or medium. In GB/T 34590, specified work products are evaluated during subsequent activities, either as part of the confirmation measures or as part of the verification activities. The purpose of a safety case is to provide a clear, comprehensive and defensible argument, supported by evidence, that an item is free from unreasonable risk when operated in an intended context.6 Concept Phase and System DevelopmentConsider the example of an item controlling an energy storage device embedded in the vehicle. For the purpose of this example, the stored energy is intended to be released only if the vehicle is running greater than or equal to 15 km/h. As explained in GB/T 34590.3-2022, Clause 6, the controllability represents an estimation of the probability that the driver or other traffic participant is able to avoid the specific harm. Safety goals are top-level safety requirements for the item. They lead to the functional safety requirements needed to avoid an unreasonable risk for a hazardous event.7 Safety Process Requirement StructureThe flow and sequence of the safety requirement development in accordance with the GB/T 34590 series of standards is illustrated in Figure 8 and Figure 9.8 Concerning Hardware DevelopmentIn general, the combinations of faults that are considered are limited to combinations of two independent hardware faults, unless analysis based on the functional or technical safety concept has shown that n point faults with n >2 are relevant.9 Safety Element out of ContextThe automotive industry develops generic elements for different applications and for different customers. These generic elements can be developed independently by different organizations. In such cases assumptions are made about the requirements and the design; including the safety requirements that are allocated to the element by higher design levels and on the design external to the element. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 34590.10-2022 be delivered?Answer: The full copy PDF of English version of GB/T 34590.10-2022 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 34590.10-2022_English with my colleagues?Answer: Yes. 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