ISO/TS 19466:2017

TECHNICAL ISO/TS
SPECIFICATION 19466
First edition
2017-07
Electrically propelled mopeds
and motorcycles — Test method
for evaluating performance of
regenerative braking systems
À propulsion électrique cyclomoteurs et des motocycles — Méthode
d’essai pour évaluer l’efficacité du système de freinage régénératif
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles . 2
5 Test procedure for reference range gain and reference energy consumption gain .3
5.1 General . 3
5.2 Reference range gain. 3
5.3 Reference energy consumption gain . 3
6 Test procedure for regenerative braking efficiency of traction motor system .4
6.1 Test setup . 4
6.1.1 General. 4
6.1.2 Load motor system . 4
6.1.3 Torque and speed sensors . 4
6.1.4 DC power supply . 5
6.1.5 Power analyser . 5
6.1.6 Voltage and current measurement . 5
6.1.7 Temperature measurement . 5
6.2 Test procedure . 5
6.2.1 General. 5
6.2.2 Steady-state regenerative braking efficiency . 5
6.2.3 Transient regenerative braking efficiency measurement test . 8
Annex A (informative) Test report .11
Bibliography .13
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
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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
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URL: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 38,
Motorcycles and mopeds.
iv © ISO 2017 – All rights reserved

TECHNICAL SPECIFICATION ISO/TS 19466:2017(E)
Electrically propelled mopeds and motorcycles — Test
method for evaluating performance of regenerative
braking systems
1 Scope
This document specifies test procedures for measuring performance of regenerative braking systems
used for electric motorcycles and mopeds that are propelled by traction motors with electric batteries.
Performance of regenerative braking systems is dealt with two perspectives: first, how much a
regenerative braking system can extend range of a motorcycle or moped or reduce energy consumption,
and second, the efficiency of the driving motor system when working as generator in regenerative
braking mode.
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 13064-1:2012, Battery-electric mopeds and motorcycles — Performance — Part 1: Reference energy
consumption and range
ISO 13064-2:2012, Battery-electric mopeds and motorcycles — Performance — Part 2: Road operating
characteristics
IEC 60034-1, Rotating electrical machines — Part 1: Rating and performance
IEC 60034-2-1, Rotating electrical machines — Part 2-1: Standard methods for determining losses and
efficiency from test (excluding machines for traction vehicles)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13064-2, IEC 60034-1,
IEC 60034-2-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1
load motor
electric motor that can simulate road load, as well as braking torque, when testing a test motor system
(3.11) of electric mopeds and motorcycles
Note 1 to entry: During test, both rotational speed and torque of load motor shall be controllable within a
specified range.
3.2
load motor system
combination of a load motor (3.1) and its inverter
3.3
reference energy consumption
quantity of electric energy from the mains needed to charge the traction battery, divided by the distance
covered after an electric motorcycle or moped has been driven through the specified test sequence
Note 1 to entry: The reference energy consumption is usually expressed in watt-hours per kilometres (Wh/km).
[SOURCE: ISO/TR 8713:2012, 2.62, modified — “the vehicle” has been replaced by “an electric
motorcycle or moped”.]
3.4
reference energy consumption gain
ratio of reference energy consumption (3.3) to change in reference energy consumption due to
regenerative braking system
Note 1 to entry: Gain is positive when reference energy consumption is decreased by regenerative braking system.
3.5
reference range
distance covered by an electrically propelled motorcycle or moped over a designated test sequence on
a fully charged traction battery to the end of the test sequence as defined by the end of test sequence
criteria
Note 1 to entry: The reference range is usually expressed in kilometeres (km).
[SOURCE: ISO/TR 8713:2012, 2.63, modified — “vehicle” has been replaced by “motorcycle or moped”.]
3.6
reference range gain
ratio of reference range (3.5) to change in reference range due to regenerative braking system (3.7)
Note 1 to entry: Gain is positive when reference range is increased by regenerative braking system.
3.7
regenerative braking system
brake system which, during deceleration, provides for the conversion of kinetic energy into
electrical energy
3.8
regenerative braking efficiency of traction motor system
efficiency of a traction motor system when working as a generator in regenerative braking mode, which
is the ratio of mechanical power input to electrical power output
3.9
state of charge
SOC
actual capacity of a battery pack or system, indicated as percentage of the rated capacity
3.10
test motor
motor under test that is used as a main traction motor for electric mopeds and motorcycles, which
generates traction torque as well as regenerative electric energy during braking
3.11
test motor system
combination of test motor (3.10) and its inverter
4 Principles
Performance of a regenerative system is affected by various elements, i.e. motor and inverter, battery
SOC, temperature, brake control strategy, road load, traffic situation, driving behaviour of drivers, etc.
2 © ISO 2017 – All rights reserved

In order to measure performance of regenerative braking system accounting for these wide range of
factors, performance is defined for both vehicle and traction motor system perspectives. Performance
of regenerative braking system in view of vehicle is defined in reference range gain (see 5.2) or reference
energy consumption gain (see 5.3), while performance in view of traction motor system is defined in
terms of efficiency of traction motor system when used as a generator (see Clause 6).
NOTE Reference energy consumption gain or reference range gain represents measure of performance
improvement of the vehicle system by regenerative braking in terms of reference energy consumption and
reference range, respectively.
5 Test procedure for reference range gain and reference energy consumption gain
5.1 General
Measurements of reference range gain and reference energy consumption gain are based on the
reference range and reference energy consumption specified in ISO 13064-1, where test sequence for
mopeds is defined in ISO 13064-1:2012, Annex A and the test sequence for motorcycles is defined in
ISO 13064-1:2012, Annex B.
5.2 Reference range gain
To measure reference range gain, reference range of a motor cycle or moped shall be determined
according to ISO 13064-1 with regenerative braking system ON and OFF. The test procedure to
determine reference range gain consists of the following steps:
a) initial charging of the traction battery (see ISO 13064-1:2012, 7.4.2);
b) application of the appropriate test sequence with regenerative braking system ON until the
tolerance on velocity defined in ISO 13064-1:2012, Clause 5 is met and measurement of the
reference range d (see ISO 13064-1:2012, 7.4.3);
on
c) application of the appropriate test sequence with regenerative braking system OFF until the
tolerance on velocity defined in ISO 13064-1:2012, Clause 5 is met and measurement of the
reference range d (see ISO 13064-1:2012, 7.4.3);
off
d) calculation of reference range gain, G , according to Formula (1):
range
dd−
on off
G = ×100 (1)
range
d
on
5.3 Reference energy consumption gain
To measure reference energy consumption gain, reference energy consumption of a motorcycle or
moped shall
...