ISO 26021-4:2009

Road vehicles — End-of-life activation of on-board pyrotechnic devices — Part 4: Additional communication line with bidirectional communication

ISO 26021-4:2009 defines the requirements of redundancy hardware or software systems independent from the controller area network (CAN) line, which are activated by the additional communication line (ACL hardware line). It describes the additional sequences of the deployment process, and the technical details for the direct hardware connection between the pyrotechnic device deployment tool (PDT) and the pyrotechnic control unit (PCU).

Véhicules routiers — Activation de fin de vie des dispositifs pyrotechniques embarqués — Partie 4: Ligne de communication additionnelle avec communication bidirectionnelle

General Information

• Status: Withdrawn
• Publication Date: 07-May-2009
• ICS: 43.040.80 - Crash protection and restraint systems
• Technical Committee: ISO/TC 22/SC 31 - Data communication
• Drafting Committee: ISO/TC 22/SC 31/WG 4 - Network applications
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 03-May-2022

Relations

• Revised: ISO 26021-3:2022 - Road vehicles — End-of-life activation of in-vehicle pyrotechnic devices — Part 3: Data definitions
• Effective Date: 26-Nov-2021
• Revised: ISO 26021-1:2022 - Road vehicles — End-of-life activation of in-vehicle pyrotechnic devices — Part 1: Application and communication interface
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 26021-4
First edition
2009-05-15

Road vehicles — End-of-life activation of
on-board pyrotechnic devices —
Part 4:
Additional communication line with
bidirectional communication
Véhicules routiers — Activation de fin de vie des dispositifs
pyrotechniques embarqués —
Partie 4: Ligne de communication additionnelle avec communication
bidirectionnelle




Reference number
ISO 26021-4:2009(E)
©
ISO 2009

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ISO 26021-4:2009(E)
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ii © ISO 2009 – All rights reserved

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ISO 26021-4:2009(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions, abbreviated terms . 1
3.1 Terms and definitions. 1
3.2 Abbreviated terms . 2
4 Conventions . 2
5 Pyrotechnic device deployment via on-board diagnostic architecture . 2
5.1 Vehicle system description . 2
5.2 Example of in-vehicle hardware and software provision . 3
5.3 Additional communication line . 3
6 ACL with bidirectional specification (Hardware description) . 4
6.1 Connection to the vehicle . 4
6.2 Physical layer. 4
7 Deployment process with ACL and bidirectional communication . 5
7.1 Deployment process – overview. 5
7.2 Data link layer. 5
7.3 ACL step 1 – request deployment sequence . 7
7.4 ACL step 2 – deployment confirmation sequence . 9
7.5 ACL step 3 – deployment terminfation sequence . 9
7.6 Summary of data byte format transmitted during ACL steps 1, 2 and 3. 10
Bibliography . 11

© ISO 2009 – All rights reserved iii

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ISO 26021-4:2009(E)
Foreword
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 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 work. 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 International 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 the 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 26021-4 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3,
Electrical and electronic equipment.
ISO 26021 consists of the following parts, under the general title Road vehicles — End-of-life activation of
on-board pyrotechnic devices:
⎯ Part 1: General information and use case definitions
⎯ Part 2: Communication requirements
⎯ Part 3: Tool requirements
⎯ Part 4: Additional communication line with bidirectional communication
⎯ Part 5: Additional communication line with pulse width modulated signal
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ISO 26021-4:2009(E)
Introduction
Worldwide, nearly all new vehicles are equipped with one or more safety systems. This can include advanced
protection systems based on pyrotechnic actuators. All components which contain pyrotechnic substances
can be handled in the same way.
Recycling these vehicles demands a new process to ensure that the deactivation of airbags is safe and
cost-efficient. Due to the harmonization of the on-board diagnostic (OBD) interface, there is a possibility of
using it for on-board deployment, which is based on the same tools and processes.
Representatives of the global automobile industry agreed that automobile manufacturers
⎯ do not support reuse as an appropriate treatment method for pyrotechnic devices,
⎯ believe treatment of pyrotechnic devices is required before shredding, and
⎯ support in-vehicle deployment as the preferred method.
Based on this agreement, the four big associations of automobile manufacturers (ACEA, Alliance, JAMA and
KAMA) started to develop a method for the “in-vehicle deployment of pyrotechnic components in cars with the
pyrotechnic device deployment tool (PDT)”. The objective is that in the future a dismantler will use only one
tool without any accessories to deploy all pyrotechnic devices inside an end-of-life vehicle (ELV) by using an
existing interface to the car.
Because of different requirements and safety concepts an additional communication line (ACL) is added to the
basic CAN communication method. In this part of ISO 26021 ACL is used to mean an additional
communication line with bidirectional communication. This bidirectional communication is used for systems
with a specific concept that the initiation requires ECU acknowledgement.


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INTERNATIONAL STANDARD ISO 26021-4:2009(E)

Road vehicles — End-of-life activation of on-board pyrotechnic
devices —
Part 4:
Additional communication line with bidirectional
communication
1 Scope
This part of ISO 26021 defines the requirements of redundancy hardware or software systems independent
from the controller area network (CAN) line, which are activated by the additional communication line (ACL
hardware line).
It also describes the additional sequences of the deployment process, and the technical details for the direct
hardware connection between the pyrotechnic device deployment tool (PDT) and the pyrotechnic control unit
(PCU).
2 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 any amendments) applies.
ISO 14230-1, Road vehicles — Diagnostic Systems — Keyword Protocol 2000 — Part 1: Physical layer
ISO 15031-3, Road vehicles — Communication between vehicle and external equipment for emissions-related
diagnostics — Part 3: Diagnostic connector and related electrical circuits, specification and use
ISO 15765-3, Road vehicles — Diagnostics on Controller Area Networks (CAN) — Part 3: Implementation of
unified diagnostic services (UDS on CAN)
ISO 15765-4, Road vehicles — Diagnostics on Controller Area Networks (CAN) — Part 4: Requirements for
emissions-related systems
ISO 26021-1, Road Vehicles
...