ISO/PAS 21779-1:2025

Publicly
Available
Specification
ISO/PAS 21779-1
First edition
Road vehicles — Test method
2025-05
to evaluate the performance of
acceleration control pedal error
(ACPE) —
Part 1:
Car-to-car from standstill
Véhicules routiers — Méthode d'essai pour évaluer la
performance du contrôle de l'accélération en cas d'erreur de
pédale (ACPE) —
Partie 1: Véhicule-véhicule à partir de l'arrêt
Reference number
© ISO 2025
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ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic concept of the test . 3
5 Test conditions . 3
5.1 General .3
5.2 General data .3
5.3 Specifications of test vehicle .3
5.4 State of test vehicle .3
5.4.1 General .3
5.4.2 Load condition .4
5.4.3 Tyres .4
5.4.4 Braking system .4
5.4.5 Drive shaft .4
5.4.6 Engine setting, power character .4
5.4.7 Protection device .4
5.4.8 Setting of the ACPE device .4
5.5 Test course .4
5.5.1 Test track .4
5.5.2 Environment .5
5.6 Weather conditions .5
5.6.1 Temperature .5
5.6.2 Wind speed .5
5.6.3 Visibility .5
5.6.4 Conditions for test omission .5
5.7 Measurement items .5
5.8 Measurement equipment.5
6 Test method . 6
6.1 Test preparation .6
6.1.1 Initialization work .6
6.1.2 Break-in driving .6
6.1.3 Selection of test conditions .6
6.2 Testing .7
6.2.1 Rebreaking in .7
6.2.2 Setup of starting position of test driving .7
6.2.3 Brake temperature .7
6.2.4 EVT placement.7
6.2.5 Transmission .7
6.2.6 Moving to the starting position of test driving .7
6.2.7 Preparation at the starting point of test driving .7
6.2.8 Test driving .8
6.2.9 Number of tests .8
6.3 Confirmation of test results and record of test image .8
6.3.1 Measurement section .8
6.3.2 Arrangement of measurement data .8
6.3.3 Record of test image .8
6.3.4 Test validity confirmation .9
7 Records of test results . 9
7.1 Record of environmental conditions and others.9
7.2 Record of measurement values .9

iii
7.3 Test outcomes .9
Annex A (normative) Conditions of ACPE and specifications of the test vehicle .10
Annex B (normative) Performance test results of ACPE.11
Bibliography .13

iv
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
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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 document should be noted. This document was drafted in accordance with the editorial rules of the
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 33, Vehicle
dynamics, chassis components and driving automation systems testing.
A list of all parts in the ISO 21779 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.

v
Introduction
The aim of the acceleration control for pedal error (ACPE) is to prevent a car accident at a low speed due to
driver’s pedal misapplication. The standard of the system definition is developed on ISO/PAS 19486, and
this document is intended to assess the complete performance of ACPE fitted in a road vehicle based on JASO
C307 published in 2023.
vi
Publicly Available Specification ISO/PAS 21779-1:2025(en)
Road vehicles — Test method to evaluate the performance of
acceleration control pedal error (ACPE) —
Part 1:
Car-to-car from standstill
1 Scope
This document specifies test methods to evaluate the behaviour of a vehicle equipped with an acceleration
control pedal error (ACPE) system according to ISO/PAS 19486. Those forward and reverse accidents occur
during a straight-line acceleration when the vehicle under test (VUT) accelerates due to driver misapplication
of accelerator pedal instead of intended brake pedal. This document is limited to ACPE systems of light
vehicles only classified in UN-ECE (TRANS/WP.29/1045) Vehicle: “Category 1-1 vehicle” and does not
apply to such devices installed in vehicles of other categories, such as heavy vehicles or motorcycles. This
document focuses on an important part of the vehicle behaviour during these collision scenarios, which is
the capacity to avoid or mitigate the collision especially to the other vehicle.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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 8855, Road vehicles — Vehicle dynamics and road-holding ability — Vocabulary
ISO 15037-1:2019, Road vehicles — Vehicle dynamics test methods — Part 1: General conditions for passenger cars
ISO 19206-1, Road vehicles — Test devices for target vehicles, vulnerable road users and other objects, for
assessment of active safety functions — Part 1: Requirements for passenger vehicle rear-end targets
ISO 19206-3, Road vehicles — Test devices for target vehicles, vulnerable road users and other objects, for
assessment of active safety functions — Part 3: Requirements for passenger vehicle 3D targets
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8855, ISO 15037-1, ISO 19206-1,
ISO 19206-3 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
reference track
target track for a test vehicle
3.2
vehicle mass at the time of delivery
mass of the test vehicle, which is loaded with full capacity of fuel, lubricating oil, cooling water, etc. in the
motor and fuel systems, including vehicle-mounted tools, spare tyres and other standard equipment

3.3
brake temperature before test driving
highest temperature of the brake linings/pads of each wheel of the test vehicle to be measured while the test
vehicle is stationary immediately before starting each test run
3.4
EVT
equivalent vehicle target
vehicle target designed to be detectable by sensors
Note 1 to entry: Such sensors are, for example, lidar, millimetre wave radar, cameras able to detect a typical segment-C
passenger car.
3.5
VUT
vehicle under test
vehicle tested with the accelerator pedal control error (APCE) system
3.6
virtual collision location
location where a collision is assumed to occur on the reference track (3.1)
Note 1 to entry: See Figure 1.
3.7
distance from the virtual collision location
d
distance between the virtual collision location (3.6) on the reference track (3.1) and the front-centre (for F
off
or F testing in Table 1) or back-centre (for R or R testing in Table 1) of the vehicle under test (VUT) (3.5)
on off on
Note 1 to entry: See Figure 1.
3.8
lateral deviation amount
amount of lateral shift of the front-centre of the vehicle under test (VUT) (3.5) relative to the reference track (3.1)
Note 1 to entry: See Figure 1.
3.9
braking-off
point when the foot of the driver of the vehicle under test (VUT) (3.5) is not pressed and removed from the
brake pedal during the test driving
3.10
accelerator-on
point when the accelerator pedal starts moving during the test driving
3.11
accelerator-full
point when the accelerator pedal is fully pressed during the test driving
3.12
starting position for test driving
target position on the reference track (3.1) to begin test driving, which is set for each test

Key
1 vehicle under test (VUT)
2 lateral deviation amount of test vehicle
3 virtual collision location
4 equivalent vehicle target (EVT)
5 reference track
6 distance from the virtual collision location (d)
7 lateral deviation angle
Figure 1 — Concept diagram for definitions
4 Basic concept of the test
The purpose of this test method is to evaluate performance of the sudden acceleration control function of the
ACPE device which aims at the prevention or mitigation of a collision that may occur as a result of driver’s
error, i.e. depressing the accelerator pedal instead of the brake pedal. Therefore, this document specifies
environmental conditions, vehicle states, test preparation, test methods, and relevant records which are
necessary to objectively measure system performance. To es
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