GB/T 34590.10-2022Road vehicles - Functional safety - Part 10: Guideline (English PDF)

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 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;

1 Scope

This 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 References

The 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 Definitions

For the purposes of this Document, the terms and definitions given in GB/T 34590.1-2022 apply.

4 Key Concepts of GB/T 34590

GB/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 Management

6 Concept Phase and System Development

Consider 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 Structure

The 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 Development

In 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 Context

The 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.

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