ISO 26021-5:2009

Road vehicles — End-of-life activation of on-board pyrotechnic devices — Part 5: Additional communication line with pulse width modulated signal

ISO 26021-5:2008 defines the requirements of redundancy hardware or software systems independent from the CAN line which are activated by the ACL hardware line. It also describes the additional sequences of the deployment process, and the technical details for the direct hardware connection between pyrotechnic device tool (PDT) and pyrotechnic control unit (PCU).

Véhicules routiers — Activation de fin de vie des dispositifs pyrotechniques embarqués — Partie 5: Ligne de communication additionnelle avec signal modulé par largeur d'impulsion

General Information

• Status: Withdrawn
• Publication Date: 16-Jul-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 26021-5
First edition
2009-07-15


Road vehicles — End-of-life activation of
on-board pyrotechnic devices —
Part 5:
Additional communication line with pulse
width modulated signal
Véhicules routiers — Activation de fin de vie des dispositifs
pyrotechniques embarqués —
Partie 5: Ligne de communication additionnelle avec signal modulé par
largeur d'impulsion




Reference number
ISO 26021-5:2009(E)
©
ISO 2009

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ISO 26021-5:2009(E)
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ii © ISO 2009 – All rights reserved

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ISO 26021-5:2009(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Abbreviated terms . 2
5 Conventions . 2
6 Pyrotechnic device deployment via on-board diagnostic architecture . 2
6.1 Vehicle system description . 2
6.2 Example of in-vehicle hardware and software provision . 3
6.3 Additional communication line . 3
7 ACL with PWM specification . 4
7.1 Hardware description . 4
7.2 PCU hardware compatibility to the L line. 5
7.3 Allowed supply voltage. 5
7.4 Signal description. 5
8 Deployment process with ACL line and PWM signal. 8
8.1 General information. 8
8.2 Deployment process description . 8
9 Connections to the vehicle . 14
Bibliography . 15

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ISO 26021-5:2009(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 26021-5 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 26021-5:2009(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 controller area network (CAN) communication method. In this part of ISO 26021 ACL is used to mean
an additional communication line with pulse width modulated signal. This direct hardware (HW) connection is
used for systems with a specific safing concept, to bypass it and then enable the deployment of such systems.

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INTERNATIONAL STANDARD ISO 26021-5:2009(E)

Road vehicles — End-of-life activation of on-board pyrotechnic
devices —
Part 5:
Additional communication line with pulse width modulated
signal
1 Scope
This part of ISO 26021 defines the requirements of redundancy hardware or software systems independent
from the CAN line which are activated by the ACL hardware line.
It also describes the additional sequences of the deployment process, and the technical details for the direct
hardware connection between pyrotechnic device deployment tool (PDT) and 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 14229-1, Road vehicles — Unified diagnostic services (UDS) — Part 1: Specification and requirements
SO 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 15031-5, Road vehicles — Communication between vehicle and external equipment for emissions-related
diagnostics — Part 5: Emissions-related diagnostic services
ISO 26021-2, Road vehicles — End-of-life activation of on-board pyrotechnic devices — Part 2:
Communication requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14229-1 and the following apply.
3.1
PWM
pulse width modulation
signal linked by the ACL to the independent hardware path in the PCU
NOTE The PWM signal is active during the deployment session.
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ISO 26021-5:2009(E)
4 Abbreviated terms
ACL additional communication line
GND ground signal
HW hardware
µC microcontroller
OBD on-board diagnostics
PCU pyrotechnic control unit
PDT pyrotechnic device deployment tool
5 Conventions
ISO 26021 is based on the conventions discussed in the OSI service conventions (ISO/IEC 10731) as they
apply for diagnostic services.
6 Pyrotechnic device deployment via on-board diagnostic architecture
6.1 Vehicle system description
ISO 26021 is based on an envisaged diagnostic network architecture in combination with the PCU deployment
architecture, as described in this subclause.
ISO 26021-2 defines the mandatory vehicle-interface of the PCU and PDT. The PCU is connected with the
vehicle diagnostic connector and the communication specifications comply with ISO 15765-3 and
ISO 15765-4. The PDT communicates with the PCU on CAN_H and CAN_L and enables deployment with the
pulse width modulated signal.
Depending upon the vehicle-specific architecture, the mandatory link of the PCU may be connected via a
gateway to the OBD connector, thus a CAN interface in the PCU for the mandatory link may not be required.

Figure 1 — Access to the vehicle via diagnostic connector
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ISO 26021-5:2009(E)
6.2 Example of in-vehicle hardware and software provision
To execute the on-board deployment via the diagnostic link, the PCU software shall have full access to the
output driver stage, which controls the deployment loops. To achieve this, the safing path is controlled via the
ACL line with a PWM signal.

Figure 2 — Overview of hardware and software provision
6.3 Additional communication line
Depending on the hardware architecture of the PCU the additional signal is used. General requirements for
the interface between deployment sequence and ACL sequence are given in Clause 7.

Figure 3 — Integration of ACL communication into deployment process
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