ISO/TR 5262:2023

Motorcycles — Guideline for verification of total running resistance force during mode running on a chassis dynamometer

This document shows the results of investigating the guideline for determining the threshold of the evaluation result on an electric inertial chassis dynamometer that electrically controls the amount of inertia using fuel consumption. This document is applicable when the running resistance force of a chassis dynamometer is set in accordance with ISO 18580.

Motocycles — Lignes directrices pour la vérification de la force totale de résistance à l'avancement durant les essais sur un banc dynamométrique en mode roulage

General Information

• Status: Published
• Publication Date: 14-Jun-2023
• ICS: 43.140 - Motorcycles and mopeds
• Technical Committee: ISO/TC 22/SC 38 - Motorcycles and mopeds
• Drafting Committee: ISO/TC 22/SC 38/WG 1 - Pollution and energy
• Current Stage: 6060 - International Standard published
• Start Date: 15-Jun-2023
• Due Date: 06-May-2023
• Completion Date: 15-Jun-2023

Standards Content (Sample)

TECHNICAL ISO/TR
REPORT 5262
First edition
2023-06
Motorcycles — Guideline for
verification of total running resistance
force during mode running on a
chassis dynamometer
Motocycles — Lignes directrices pour la vérification de la force
totale de résistance à l'avancement durant les essais sur un banc
dynamométrique en mode roulage
Reference number
ISO/TR 5262:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO/TR 5262:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/TR 5262:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Evaluation method .3
5.1 Test summary . 3
5.2 Vehicle test . 4
5.2.1 Test cycles . 4
5.2.2 Warm-up condition . 4
5.2.3 Evaluation requirements . 4
5.2.4 Evaluation procedure . . 5
5.3 Simulation test . 5
5.3.1 Test cycles . 5
5.3.2 Evaluation requirements . 5
5.3.3 Evaluation procedure . . 6
6 Test result . . 6
6.1 General . 6
6.2 Vehicle test result . 7
6.2.1 Relationship between fuel consumption and correlation coefficient of
vehicle 1,2,3 and 4 . 7
6.2.2 Relationship between fuel consumption and slope of the regression line of
vehicle 1,2,3 and 4 . 8
6.2.3 Relationship between fuel consumption and intercept of the regression
line of vehicle 1,2,3 and 4 . 9
6.2.4 Relationship between fuel consumption and relative standard deviation of
vehicle 1,2,3 and 4 . 10
6.2.5 Relationship between fuel consumption and integral work error of vehicle
1,2,3 and 4 . 11
6.3 Simulation test result . 12
6.3.1 Relationship between fuel consumption and dead time of vehicle 5 .12
6.3.2 Relationship between fuel consumption and rise time of vehicle 5 .13
7 Guideline . .15
iii
© ISO 2023 – All rights reserved

---------------------- Page: 3 ----------------------
ISO/TR 5262:2023(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.
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 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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 38,
Motorcycles and mopeds.
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 2023 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/TR 5262:2023(E)
Introduction
A mechanical inertia chassis dynamometer (Formula (1)) is a device with a mechanical flywheel,
whereas a chassis dynamometer (Formula (2)) using the electric inertia function is not equipped with
such a mechanical flywheel equivalent to inertia mass system and the inertia force is electrically set
in the same way of the running resistance force control (Figure 1). The inertia force is generated by
the acceleration and/or deceleration, therefore, it is necessary to check the performance of electric
inertia function during the mode running test and ISO 18580 specifies the method to verify the chassis
dynamometer operated normally.
However, ISO 18580 does not provide a threshold for the verification result, and it is difficult to
determine its validity. Therefore, we investigate the effect of factors affecting fuel consumption on
ISO 18580 verification results, and propose a technical report that shows the guideline for determining
the threshold of the verification result.
a) mechanical inertia b) electrical inertia
Key
1 dynamometer
2 tire
3 roller
4 flywheels
5 acceleration resistance
6 rolling resistance
7 aerodynamic drag resistance
NOTE The symbols are defined in Clause 4.
Figure 1 — The principle of mechanical and electrical inertia dynamometer
v
© ISO 2023 – All rights reserved

---------------------- Page: 5 ----------------------
TECHNICAL REPORT ISO/TR 5262:2023(E)
Motorcycles — Guideline for verification of total running
resistance force during mode running on a chassis
dynamometer
1 Scope
This document shows the results of investigating the guideline for determining the threshold of the
evaluation result on an electric inertial chassis dynamometer that electrically controls the amount of
inertia using fuel consumption.
This document is applicable when the running resistance force of a chassis dynamometer is set in
accordance with ISO 18580.
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 18580, Motorcycles — Verification of total running resistance force during mode running on a chassis
dynamometer
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 18580 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
3.1
dead time
time between the input being given and the output
Note 1 to entry: Dead time is shown in Figure 2, key 3.
3.2
rise time
time required to reach 10 %-90 % of the final output value
Note 1 to entry: Rise time is shown in Figure 2, key 4.
1
© ISO 2023 – All rights reserved

---------------------- Page: 6 ----------------------
ISO/TR 5262:2023(E)
Key
X time [s]
Y rate [%]
1 input
2 output
3 dead time
4 rise time
Figure 2 — Image of dead time and rise time
4 Symbols
Symbol Definition Unit
A slope of the regression line —
a rolling resistance force of front wheel N
B intercept of the regression line —
b coefficient proportional to motorcycle speed N/(km/h)
2
c aerodynamic drag coefficient N/(km/h)
CO carbon monoxide g/km
CO carbon dioxide g/km
2
D gasoline density kg/l
e integral work error %
W
R rate of fuel consumption l/100 km
fc
F target total running resistance force N
tg
HC hydrocarbon g/km
mass obtained by adding the rotating mass of the front wheel
m kg
i
to the total mass of the motorcycle, rider and instruments
m equivalent inertia mass of mechanical rotating parts of chassis dynamometer kg
b
t time s
V roller rotational speed km/h
γ correlation coefficient —
σ relative standard deviation (cov: coefficient of variation) %
cov
...

TECHNICAL     ISO/TR
REPORT       DTR 5262

First draft
ISO/TC 22/SC 38
Secretariat: UNI
Date: 20222023-03-0402
Motorcycles — Guideline for verification of total running
resistance force during mode running on a chassis dynamometer
Motocycles — Lignes directrices pour la vérification de la force totale de résistance à l'avancement durant
les essais sur un banc dynamométrique en mode roulage
FDIS stage
© ISO /TR5262 2023 – All rights reserved

---------------------- Page: 1 ----------------------
ISO/TRDTR 5262:2022(:(E)
© ISO 20222023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this
publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can
be requested from either ISO at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: [e-mail]
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO/TR5262 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/TRDTR 5262:2022(:(E)
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Evaluation method . 3
5.1 Test summary . 3
5.2 Vehicle test . 5
5.2.1 Test cycles . 5
5.2.2 Warm-up condition . 5
5.2.3 Evaluation requirements . 5
5.2.4 Evaluation procedure . 6
5.3 Simulation test . 6
5.3.1 Test cycles . 6
5.3.2 Evaluation requirements . 6
5.3.3 Evaluation procedure . 7
6 Test result . 7
6.1 General . 7
6.2 Vehicle test result. 7
6.2.1 Relationship between fuel consumption and correlation coefficient of vehicle 1,2,3 and 4 . 7
6.2.2 Relationship between fuel consumption and slope of the regression line of vehicle 1,2,3 and 4 9
6.2.3 Relationship between fuel consumption and intercept of the regression line of vehicle 1,2,3 and
4 11
6.2.4 Relationship between fuel consumption and relative standard deviation of vehicle 1,2,3 and 4
13
6.2.5 Relationship between fuel consumption and integral work error of vehicle 1,2,3 and 4 . 15
6.3 Simulation test result . 17
6.3.1 Relationship between fuel consumption and dead time of vehicle 5 . 17
6.3.2 Relationship between fuel consumption and rise time of vehicle 5 . 18
7 Guideline . 21

© ISO 2022 2023 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/TRDTR 5262:2022(:(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.
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 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. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 38,
Motorcycles and mopeds.
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/TR5262 2023 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/TRDTR 5262:2022(:(E)
Introduction
A mechanical inertia chassis dynamometer (Formula (1)) is a device with a mechanical flywheel, whereas
a chassis dynamometer (Formula (2)) using the electric inertia function is not equipped with such a
mechanical flywheel equivalent to inertia mass system and the inertia force is electrically set in the same
way of the running resistance force control (Figure 1(Figure 1).). The inertia force is generated by the
acceleration and/or deceleration, therefore, it is necessary to check the performance of electric inertia
function during the mode running test and ISO 18580 specifies the method to verify the chassis
dynamometer operated normally.
However, ISO 18580 does not provide a threshold for the verification result, and it is difficult to determine
its validity. Therefore, we investigate the effect of factors affecting fuel consumption on ISO 18580
verification results, and propose a technical report that shows the guideline for determining the
threshold of the verification result.

2
2
3
1
1

3
4




5+6+7
6+7



5

d𝑉𝑉 d𝑉𝑉 d𝑉𝑉
2 2
𝐹𝐹 =𝑎𝑎+𝑏𝑏𝑏𝑏+𝑐𝑐𝑏𝑏 +𝑚𝑚 (1)             𝐹𝐹 =𝑎𝑎+𝑏𝑏𝑏𝑏+𝑐𝑐𝑏𝑏 +𝑚𝑚 +𝑚𝑚 (2)
tg i tg i−b b
d𝑡𝑡 d𝑡𝑡 d𝑡𝑡

5
5



© ISO 2022 2023 – All rights reserved v

---------------------- Page: 5 ----------------------
ISO/TRDTR 5262:2022(:(E)


a) mechanical inertia b) electrical inertia
Key
1 dynamometer
2 tire
3 roller
4 flywheels
5 acceleration resistance
6 rolling resistance
7 aerodynamic drag resistance
NOTE The variablessymbols are defined in Clause 4Clause 4.
Figure 1 — The principle of mechanical and electrical inertia dynamometer
vi © ISO/TR5262 2023 – All rights reserved

---------------------- Page: 6 ----------------------
ISO/DTR 5262:(E)
Motorcycles — Guideline for verification of total running
resistance force during mode running on a chassis dynamometer
1 Scope
This document shows the results of investigating the guideline for determining the threshold of the
evaluation result on an electric inertial chassis dynamometer that electrically controls the amount of
inertia using fuel consumption.
This document is applicable when the running resistance force of a chassis dynamometer is set in
accordance with ISO 18580.
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 18580, Motorcycles — Verification of total running resistance force during mode running on a chassis
dynamometer
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 18580 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
Field Code Changed
3.1
dead time
time between the input being given and the output appearing
Note 1 to entry: Dead time is shown in Figure 2Figure 2, key 3.
3.2
rise time
time required to reach 10 %-90 % of the final output value
1
Y
Note 1 to entry: Rise time is shown in Figure 2Figure 2, key 4.
100
90


10

0
X
2




3 4
© ISO 2022 2023 – All rights reserved 1

---------------------- Page: 7 ----------------------
ISO/DTR 5262:(E)

Key
X time [s]
Y rate [%]
1 input
2 output
3 dead time
4 rise time
X time [s]
Y rate [%]

Figure 2 — Image of dead time and rise time
4 Symbols
Symbol Definition Unit
A slope of the regression line —
a rolling resistance force of front wheel N
B intercept of the regression line —
b coefficient proportional to motorcycle speed N/(km/h)
2
c aerodynamic drag coefficient N/(km/h)
CO carbon monoxide g/km
CO carbon dioxide g/km
2
D gasoline density kg/l
eW integral work error %
l/100km100
Rfc rate of fuel consumption
km
Ftg target total running resistance force N
HC hydrocarbon g/km
mass obtained by adding the rotating mass of the front wheel
m kg
i
to the total mass of the motorcycle, rider and instruments
m equivalent inertia mass of mechanical rotating parts of chassis dynamometer kg
b
t time s
V roller rotational speed km/h
γ correlation coefficient —
2 © ISO 2022 2023 – All rights reserved

---------------------- Page: 8 ----------------------
ISO/DTR 5262:(E)
Symbol Definition Unit
σ relative standard deviation (cov: coefficient of variation) %
cov
5 Evaluation method
5.1 Test summary
As factors affecting fuel consumption, inertial quantity, front wheel rolling resistance, wind loss
resistance, dead time, and rise time were used.
The test vehicles were investigated by selecting 5 models (1, 2, 3, 4 and 5) from different vehicle class,
gear type, and displacement of Global technical regulation No. 2.
In the test vehicles of 1, 2, 3 and 4 the setting of the mechanical inertia amount, front wheel rolling
resistance, and aerodynamic loss resistance was changed and tested in the vehicle, and the effect of each
setting difference on the relationship between fuel consumption and the target of ISO 18580 and the
evaluation items of measured total running resistance waswere investigated (Figure 3(Figure 3).).
Table 1 shows the ISO 18580 evaluation items and Table 2Table 2 shows the each vehicles specvehicle's
specifications.
In addition, since dead time and rise time, which are the inherent performance of the chassis
dynamometer, are difficult to actually generate and control by actually generating delays with the chassis
dynamometer, using simulation, the fuel consumption effect of running resistance load delay in the test
cycle of the vehicle 5 is calculated, the effect of simulated fuel consumption on the relationship between
ISO 18580 targets and measured total running resistance evaluation items was investigated.
© ISO 2022 2023 – All rights reserved 3

---------------------- Page: 9 ----------------------
ISO/DTR 5262:(E)


Key
1 regression line 𝐴𝐴×𝐹𝐹 +𝐵𝐵
tg
X target running resistance force [N]
Y measured running resistance force [N]
regression line𝐴𝐴×𝐹𝐹 +𝐵𝐵
1
tg
Figure 3 — Image of relationship between target and measured total running resistance force
Table 1 — ISO18580 target and measured total running resistance evaluation items
Correlation Slope of the Intercept of the Relative standard Integral work
coefficient regression line regression line [N] deviation [%] error [%]
γ A B σcov eW
Table 2 — Vehicles list
4 © ISO 2022 2023 – All rights reserved

---------------------- Page: 10 ----------------------
ISO/DTR 5262:(E)
Vehicle Class P/T Type Displacement Tire size Number of Number of
[cc] cylinders gears
(rear)
1 Class 2-2 AT 250 140/70-14 1 -
2 Class 2-1 MT 150 140/60R17 1 5
3 Class 3-2 DCT 1 000 130/70-17 1 6
4 Class 3-2 MT 650 160/60ZR17 2 6
5 Class 1 AT 50 80/100-10 1 -
5.2 Vehicle test
5.2.1 Test cycles
ItThe vehicle test was carried out in the test cycle of WMTC Type I test which matched the category of the
vehicle 1, 2, 3 and 4.
5.2.2 Warm-up
...

FINAL
TECHNICAL ISO/DTR
DRAFT
REPORT 5262
ISO/TC 22/SC 38
Motorcycles — Guideline for
Secretariat: UNI
verification of total running resistance
Voting begins on:
2023-03-17 force during mode running on a
chassis dynamometer
Voting terminates on:
2023-05-12
Motocycles — Lignes directrices pour la vérification de la force
totale de résistance à l'avancement durant les essais sur un banc
dynamométrique en mode roulage
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/DTR 5262:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 1 ----------------------
ISO/DTR 5262:2023(E)
FINAL
TECHNICAL ISO/DTR
DRAFT
REPORT 5262
ISO/TC 22/SC 38
Motorcycles — Guideline for
Secretariat: UNI
verification of total running resistance
Voting begins on:
force during mode running on a
chassis dynamometer
Voting terminates on:
Motocycles — Lignes directrices pour la vérification de la force
totale de résistance à l'avancement durant les essais sur un banc
dynamométrique en mode roulage
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/DTR 5262:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 2 ----------------------
ISO/DTR 5262:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Evaluation method .3
5.1 Test summary . 3
5.2 Vehicle test . 4
5.2.1 Test cycles . 4
5.2.2 Warm­up condition . 4
5.2.3 Evaluation requirements . 4
5.2.4 Evaluation procedure . . 5
5.3 Simulation test . 5
5.3.1 Test cycles . 5
5.3.2 Evaluation requirements . 5
5.3.3 Evaluation procedure . . 6
6 Test result . . 6
6.1 General . 6
6.2 Vehicle test result . 7
6.2.1 Relationship between fuel consumption and correlation coefficient of
vehicle 1,2,3 and 4 . 7
6.2.2 Relationship between fuel consumption and slope of the regression line of
vehicle 1,2,3 and 4 . 8
6.2.3 Relationship between fuel consumption and intercept of the regression
line of vehicle 1,2,3 and 4 . 9
6.2.4 Relationship between fuel consumption and relative standard deviation of
vehicle 1,2,3 and 4 . 10
6.2.5 Relationship between fuel consumption and integral work error of vehicle
1,2,3 and 4 . 11
6.3 Simulation test result . 12
6.3.1 Relationship between fuel consumption and dead time of vehicle 5 .12
6.3.2 Relationship between fuel consumption and rise time of vehicle 5 .13
7 Guideline . .15
iii
© ISO 2023 – All rights reserved

---------------------- Page: 3 ----------------------
ISO/DTR 5262:2023(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 non­governmental, 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 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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 38,
Motorcycles and mopeds.
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 2023 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/DTR 5262:2023(E)
Introduction
A mechanical inertia chassis dynamometer (Formula (1)) is a device with a mechanical flywheel,
whereas a chassis dynamometer (Formula (2)) using the electric inertia function is not equipped with
such a mechanical flywheel equivalent to inertia mass system and the inertia force is electrically set
in the same way of the running resistance force control (Figure 1). The inertia force is generated by
the acceleration and/or deceleration, therefore, it is necessary to check the performance of electric
inertia function during the mode running test and ISO 18580 specifies the method to verify the chassis
dynamometer operated normally.
However, ISO 18580 does not provide a threshold for the verification result, and it is difficult to
determine its validity. Therefore, we investigate the effect of factors affecting fuel consumption on
ISO 18580 verification results, and propose a technical report that shows the guideline for determining
the threshold of the verification result.
a) mechanical inertia b) electrical inertia
Key
1 dynamometer
2 tire
3 roller
4 flywheels
5 acceleration resistance
6 rolling resistance
7 aerodynamic drag resistance
NOTE The symbols are defined in Clause 4.
Figure 1 — The principle of mechanical and electrical inertia dynamometer
v
© ISO 2023 – All rights reserved

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TECHNICAL REPORT ISO/DTR 5262:2023(E)
Motorcycles — Guideline for verification of total running
resistance force during mode running on a chassis
dynamometer
1 Scope
This document shows the results of investigating the guideline for determining the threshold of the
evaluation result on an electric inertial chassis dynamometer that electrically controls the amount of
inertia using fuel consumption.
This document is applicable when the running resistance force of a chassis dynamometer is set in
accordance with ISO 18580.
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 18580, Motorcycles — Verification of total running resistance force during mode running on a chassis
dynamometer
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 18580 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
3.1
dead time
time between the input being given and the output
Note 1 to entry: Dead time is shown in Figure 2, key 3.
3.2
rise time
time required to reach 10 %-90 % of the final output value
Note 1 to entry: Rise time is shown in Figure 2, key 4.
1
© ISO 2023 – All rights reserved

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ISO/DTR 5262:2023(E)
Key
X time [s]
Y rate [%]
1 input
2 output
3 dead time
4 rise time
Figure 2 — Image of dead time and rise time
4 Symbols
Symbol Definition Unit
A slope of
...