ISO 20176:2020

INTERNATIONAL ISO
STANDARD 20176
Third edition
2020-09
Road vehicles — H-point machine
(HPM-II) — Specifications and
procedure for H-point determination
Véhicules routiers — Machine point H (HPM-II) — Spécifications et
procédure pour la détermination du point H
Reference number
©
ISO 2020
© ISO 2020
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Published in Switzerland
ii © ISO 2020 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Measurement procedure for the three-dimensional H-point machine .3
4.1 General . 3
4.2 Summary of installation procedure . 4
4.2.1 Summary . 4
4.2.2 Measured versus design values . 4
4.3 Prepare vehicle and seat . 4
4.3.1 Vehicle . 4
4.3.2 Seat . 5
4.4 Determine the H-point travel path (optional). 5
4.5 Adjust seat to design intent . 6
4.5.1 Move seat to design intent position . 6
4.5.2 Torso angle and cushion angle . 6
4.5.3 Seat in front of test seat . 7
4.6 Install HPM cushion and back pan assembly . 8
4.6.1 Install the cushion pan . . 8
4.6.2 Install the back pan . . 8
4.6.3 Level the HPM . . . 9
4.7 Load the HPM . 9
4.7.1 Procedure . 9
4.7.2 Summary table . 9
4.7.3 Load the cushion pan .10
4.7.4 Load the back pan .10
4.8 Soak time .11
4.9 Record measurements — digitize HPM points .11
4.9.1 General.11
4.9.2 H-point .11
4.9.3 Torso angle and cushion angle .12
4.9.4 Lumbar support prominence .12
4.9.5 Summary of driver measurements .12
5 Optional measurements for driver seat .12
5.1 Leg and shoe installations .12
5.1.1 General.12
5.1.2 Mark accelerator pedal centreline .13
5.1.3 Install the shoe fixture .13
5.1.4 Install the shoe tool .13
5.1.5 Install leg segments .14
5.2 Record measurements .15
5.2.1 General.15
5.2.2 Shoe plane angle.16
5.2.3 Ball of foot reference point . .16
5.2.4 Accelerator heel point .16
5.2.5 Accelerator heel point to ball of foot reference point lateral offset .18
5.2.6 Knee angle and ankle angle .18
5.2.7 Thigh angle and hip angle .18
6 Optional measurements for the 2nd or succeeding row passenger seats .18
6.1 Leg and shoe installation .18
6.1.1 General.18
6.1.2 Install the shoe tool .18
6.1.3 Install leg segments .20
6.2 Record measurements for rear passengers .22
6.2.1 Summary of measurements .22
6.2.2 Floor reference point .23
6.2.3 Floor plane angle .23
6.2.4 Knee clearance and legroom .23
7 Additional optional measurements .24
7.1 Effective headroom .24
7.1.1 When to install headroom fixture .24
7.1.2 Install the headroom fixture .24
7.1.3 Measure effective headroom .24
8 Remove the HPM .24
Annex A (normative) Description of the three-dimensional H-point machine (HPM) .26
Annex B (informative) HPM specification and tolerances.39
Annex C (informative) HPM field checking procedures .46
Annex D (informative) H-point design (HPD) tool description .63
Bibliography .67
iv © ISO 2020 – All rights reserved

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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is
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