Road vehicles - Functional safety audit and assessment method - Part 4: Hardware level
1 Scope
This document specifies the requirements and methods for conducting functional safety audit and assessment of functional safety related activities and results at hardware level of safety-related electrical/electronic (E/E) systems to check and judge the compliance of the development process and results to functional safety.
This document is applicable to safety-related systems including one or more electrical/electronic systems installed on mass production road vehicles other than mopeds.
This document does not apply to specific electrical/electronic (E/E) systems on special purpose vehicles, for example, vehicle systems designed for drivers with disabilities.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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
For the purpose of this document, the terms and definitions given in GB/T 43253.1-2023 apply.
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 violation of safety objective caused by random hardware failure;
——Hardware integration and verification;
——Hardware element assessment.
Through audit and assessment, it is judged that the functional safety development at the hardware level based on evidence meets the following requirements:
——Hardware safety requirements are appropriate and complete;
——It is ensured that the hardware can meet the safety requirements of hardware functions and meet the software and hardware interface specifications through design and verification;
——Evidence based on hardware architecture metrics is provided to prove the applicability of related hardware architecture design in safety-related random hardware failure detection and control;
——It is ensured that the developed hardware meets the hardware safety requirements;
——It is ensured that the functional performance of hardware elements is sufficient to meet the assigned safety requirements.
Contents
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Requirements for hardware safety
5.1 Objective
5.2 Input of audit and assessment
5.3 Requirements for audit and assessment
6 Hardware design
6.1 Objective
6.2 Input of audit and assessment
6.3 Requirements for audit and assessment
7 Assessment of hardware architecture metrics
7.1 Objective
7.2 Input of audit and assessment
7.3 Requirements for audit and assessment
8 Assessment of violation of safety objective caused by random hardware failure
8.1 Objective
8.2 Input of audit and assessment
8.3 Requirements for audit and assessment
9 Hardware integration and verification
9.1 Objective
9.2 Input of audit and assessment
9.3 Requirements for audit and assessment
10 Hardware element assessment
10.1 Objective
10.2 Input of audit and assessment
10.3 Requirements for audit and assessment
Annex A (Informative) Hardware safety requirements
Annex B (Informative) Hardware design
Annex C (Informative) Assessment of hardware architecture metrics
Annex D (Informative) Assessment of violation of safety objective caused by random hardware failure
Annex E (Informative) Hardware integration and verification
Annex F (Informative) Hardware element assessment
