GB/T 43253.4-2023Road vehicles—Functional safety audit and assessment method—Part 4: Hardware level (English PDF)
道路车辆 功能安全审核及评估方法 第4部分：硬件层面
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 27, 2023
Implementation date
November 27, 2023
Scope
GB/T 43253.4-2023 is the English-translated version of 道路车辆 功能安全审核及评估方法 第4部分：硬件层面.
This document specifies the requirements and the methods for carrying out a functional safety audit and assessment of the functional safety activities and their work products at hardware level for safety-related electrical and electronic systems, so that the development process and the conformity of the work products with functional safety can be checked and judged.
The document applies to the safety-related systems containing one or more electrical or electronic systems fitted to mass-produced road vehicles other than mopeds, and does not apply to the particular systems of special purpose vehicles. It is the fourth part of the standard.
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Document preview — GB/T 43253.4-2023
National Standard of the People's Republic of China
- ICS
- 43.040
- Classification
- T 35
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword4
- Introduction5
- 1 Scope7
- 2 Normative references7
- 3 Terms and definitions7
- 4 General requirements7
- 5 Hardware safety requirements8
- 5.1 Objective8
- 5.2 Inputs to audit and assessment9
- 5.3 Requirements for audit and assessment9
- 6 Hardware design11
- 6.1 Objective11
- 6.2 Inputs to audit and assessment11
- 6.3 Requirements for audit and assessment12
- 7 Assessment of hardware architecture metrics15
- 7.1 Objective15
- 7.2 Inputs to audit and assessment15
- 7.3 Requirements for audit and assessment16
- 8 Assessment of random hardware failures leading to safety goal violation17
- 8.1 Objective17
- 8.2 Inputs to audit and assessment17
- 8.3 Requirements for audit and assessment17
- 9 Hardware integration and verification19
- 9.1 Objective19
- 9.2 Inputs to audit and assessment19
- 9.3 Requirements for audit and assessment19
- 10 Hardware elements assessment21
- 10.1 Objective21
- 10.2 Inputs to audit and assessment21
- 10.3 Requirements for audit and assessment22
- Appendix A (Informative) Hardware safety requirements25
- Appendix B (Informative) Hardware design31
- Appendix C (Informative) Assessment of hardware architecture metrics40
- Appendix D (Informative) Assessment of random hardware failure leading to safety goal violation43
- Appendix E (Informative) Hardware integration and verification47
- Appendix F (Informative) Hardware element assessment51
Foreword
This 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 4 of GB/T 43253 Road vehicles - Functional safety audit and assessment method. The following parts have been issued for GB/T 43253.
-- Part 1: General requirements;
-- Part 2: Concept phase and system level;
-- Part 3: Software level;
-- Part 4: Hardware level.
1 Scope
This document specifies the requirements and methods for carrying out functional safety audit and assessment of functional safety-related activities and work results at the hardware level of safety-related electrical/electronic (E/E) systems, to check and judge the compliance of the development process and work results with functional safety.
This document applies to safety-related systems containing one or more electrical/electronic (E/E) systems installed on production road vehicles other than mopeds.
This document does not apply to specific electrical/electronic (E/E) systems in special purpose vehicles, for example, vehicle systems designed for disabled drivers.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document.
GB/T 34590.1~34590.12-2022, Road vehicles - Functional safety
GB/T 43253.1-2023, Road vehicles - Functional safety audit and assessment method - Part 1: General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 34590.1-2022 apply.
4 General requirements
The audit and assessment requirements defined in GB/T 43253.1-2023 apply to this document.
Functional safety audit and assessment at the hardware level mainly involves the following contents.
-- definition of hardware safety requirements;
-- hardware design;
-- assessment of hardware architecture metrics;
-- assessment of random hardware failures leading to violations of safety goals;
-- hardware integration and verification;
-- hardware element assessment.
Through audit and assessment, the functional safety development at the hardware level is judged based on evidence to meet.
5 Hardware safety requirements
5.1 Objective
The objective of this chapter is to audit and assess the definition document as a safety requirement for functional safety hardware to check whether its definition meets the needs of functional safety development and provide evidence to prove.
5.2 Inputs to audit and assessment
In order to carry out the review and assessment process specified in this chapter, the following inputs shall be available.
5.3 Requirements for audit and assessment
The audit and assessment of hardware safety requirements shall cover the check items in Table 1, Table 2, and Table 3.
6 Hardware design
6.1 Objective
The objective of this chapter is to audit and assess the hardware design to check whether it meets the needs of functional safety hardware design and provide evidence to prove.
a) Created a hardware design. Support safety-oriented analysis, consider the results
6.2 Inputs to audit and assessment
In order to carry out the review and assessment process specified in this chapter, the following inputs shall be available.
6.3 Requirements for audit and assessment
For the audit and assessment of hardware design, the check items in Table 4, Table 5, Table 6, and Table 7 shall be covered.
7 Assessment of hardware architecture metrics
7.1 Objective
The objective of this chapter is to assess the effectiveness of the related item architecture or hardware component architecture in dealing with random hardware failures by assessing whether the hardware architecture metrics (including single-point failure metric SPFM and latent failure metric LFM) reach the target value.
7.2 Inputs to audit and assessment
In order to carry out the review and assessment process specified in this chapter, the following inputs shall be available.
7.3 Requirements for audit and assessment
The audit and assessment of the assessment of hardware architecture metrics shall cover the check items in Table 8.
8 Assessment of random hardware failures leading to safety goal violation
8.1 Objective
The objective of this chapter is to assess whether the residual risk is low enough by assessing random hardware failures that lead to safety goal violation.
8.2 Inputs to audit and assessment
In order to carry out the review and assessment process specified in this chapter, the following inputs shall be available.
8.3 Requirements for audit and assessment
The audit and assessment for the assessment of random hardware failures that result in safety goal violation shall cover the check items in Table 9.
9 Hardware integration and verification
9.1 Objective
The objective of this chapter is to audit and assess the activities and results related to hardware integration and verification to check whether the hardware design meets the hardware functional safety requirements and the corresponding ASIL level.
9.2 Inputs to audit and assessment
In order to carry out the review and assessment process specified in this chapter, the following inputs shall be available.
9.3 Requirements for audit and assessment
The audit and assessment of hardware integration and verification shall cover the check items in Table 10, Table 11, and Table 12.
10 Hardware elements assessment
10.1 Objective
The objective of this chapter is to audit and assess related work results such as the hardware element assessment plan, hardware element test plan, and hardware element assessment report, to provide evidence that the functional performance of the hardware elements is sufficient to meet the assigned safety requirements, thereby ensuring that the risk of safety goal violation or safety requirements resulting from systemic failure of hardware elements is sufficiently low.
10.2 Inputs to audit and assessment
In order to carry out the review and assessment process specified in this chapter, the following inputs shall be available.
10.3 Requirements for audit and assessment
The audit and assessment of hardware element assessment shall cover the check items in Table 13, Table 14, and Table 15. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 51 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 34590.1-2022 — Road vehicles - Functional safety - Part 1: Vocabulary
GB/T 34590.10-2022 — Road vehicles - Functional safety - Part 10: Guideline
GB/T 34590.11-2022 — Road vehicles - Functional safety - Part 11: Guidelines on applications to semiconductors
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