ISO 13044-2:2021

INTERNATIONAL ISO
STANDARD 13044-2
Second edition
2021-01
Road vehicles — Fully automatic
coupling systems 24 V (FACS)
for heavy commercial vehicle
combinations —
Part 2:
Electrical and pneumatic interface for
50 mm fifth wheel couplings
Véhicules routiers — Dispositifs d'attelage entièrement automatiques
(FACS) à 24 V pour ensembles routiers lourds —
Partie 2: Interface électrique et pneumatique pour sellettes d'attelage
de 50 mm
Reference number
©
ISO 2021
© ISO 2021
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ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Requirements . 2
4.1 General . 2
4.2 Tractor and semi-trailer . 3
4.3 Mechanical interface, Manual operation . 3
4.4 EPI module . 3
4.5 Mating of the two EPI parts. 3
4.6 Guiding and alignment . 4
4.6.1 General. 4
4.6.2 Installation requirements of EPI socket module . 5
4.6.3 Installation requirements of semi-trailer-mounted EPI module . 5
4.6.4 Perpendicular degree of freedom of contacts . 6
4.6.5 Pneumatic valves in EPI socket module . 6
4.7 Encapsulation and protection . 6
4.7.1 General. 6
4.7.2 EPI plug module protection cover actuation . 6
4.7.3 Gasket between plug and socket . 7
4.8 Automation of landing legs . 7
4.9 ISO 11992 cable length . 7
4.10 Mixed mode operation . 7
5 Tests and specific requirements . 7
5.1 General . 7
5.2 Visual examination . 8
5.3 Dimensional check . 8
5.4 Connection and disconnection . 8
5.5 Locking device operation . 9
5.5.1 Application . 9
5.5.2 Requirements . 9
5.6 Current carrying capacity . 9
5.7 Connection resistance (voltage drop), cable capacitance and pneumatics . 9
5.8 Current cycling .11
5.9 Withstand voltage .12
5.10 Influence of water .12
5.11 Protection against dust .12
5.12 Endurance .12
5.13 Vibration .12
5.14 Shock resistance .12
5.15 Drop test .13
5.16 Temperature/humidity cycling .13
5.17 Salt spray .13
5.18 Chemical resistance .13
5.19 Leakage test of pneumatic connections .13
5.20 Functional test of protection covers .13
Annex A (normative) EPI module — Dimensional characteristics .14
Annex B (normative) EPI module — Contact allocation .23
Annex C (informative) Mixed mode operation .25
Bibliography .29
Foreword
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electrotechnical standardization.
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different types of ISO documents should be noted. This document was drafted in accordance with the
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iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 40,
Specific aspects for light and heavy commercial vehicles, busses and trailers.
This second edition cancels and replaces the first edition (ISO 13044-2:2013), which has been
technically revised. The main changes compared to the previous edition are as follows:
— changes to the normative references.
A list of all the parts in the ISO 13044 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved

Introduction
This document specifies the integrated electrical and pneumatic connections of an automated fifth
wheel coupling system for articulated vehicles and related components.
Fully automated coupling systems improve safety for the driver and for the vehicle combinations. They
also improve the work conditions for the driver and reduce cost for the end user.
a) Higher safety standard is achieved for example by:
— a reduction of operational accidents,
— less injured drivers because there is no need for drivers to stay in the dangerous zone between
the towing and the towed vehicle while uncoupling.
b) Higher comfort level is achieved for example by:
— elimination of necessity to access the coupling, landing gears and supply lines,
— reduction of physical demands when operating the coupling and the landing gears or when
climbing on or descending from chassis to manually connect or disconnect the supply lines.
c) Cost reduction for end user is achieved for example by:
— less repair and maintenance of cables and pipes,
— less inactive periods for the vehicle combination due to less damage and repair,
— new components create space for future ex
...