ISO 18580:2015

INTERNATIONAL ISO
STANDARD 18580
First edition
2015-11-15
Motorcycles — Verification of total
running resistance force during mode
running on a chassis dynamometer
Motocycles — Vérification de la force totale de résistance à
l’avancement durant les essais sur un banc dynamométrique en mode
roulage
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

Contents  Page
Foreword .iv
Introduction .v
1 Scope . 1
2  Terms and definitions . 1
3  Symbols . 2
4  Verification . 3
4.1 Principle . 3
4.2 Calculation . 3
5  Procedure. 5
5.1 Tools . 5
5.1.1 Data logger . 5
5.1.2 Verification software . 6
5.2 Preparation . 6
5.2.1 Check of chassis dynamometer . 6
5.2.2 Calibration of data logger . 6
5.3 Data collection . 6
5.3.1 Selection of test cycle . 6
5.3.2 Data logging. 6
5.4 Data processing . 6
5.5 Evaluation of chassis dynamometer . 6
5.6 Report . 6
Annex A (informative) Example of verification calculation . 7
Annex B (normative) Motorcycle description .11
Annex C (normative) Chassis dynamometer and instruments description .13
Annex D (normative) Verification test result.15
Bibliography .16
Foreword
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The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 38,
Motorcycles and mopeds.
iv © ISO 2015 – All rights reserved

Introduction
The ordinary chassis dynamometer has the mechanical inertia system where the running resistance is
set on the chassis dynamometer in accordance with ISO 11486 and the verification of force generated by
the inertia mass is not necessary because the equivalent inertia mass is mechanically set by a flywheel.
A chassis dynamometer 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. 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 this International Standard specifies the method to verify the chassis dynamometer operated
normally. The verification method specified in this International Standard can be applicable not only
for the total running resistance check during the exhaust gas and/or fuel consumption mode test but
also the system installation and the periodical performance check. The accurate verification can be
achieved when this method is applied to the ordinary mechanical inertia system chassis dynamometer.
INTERNATIONAL STANDARD ISO 18580:2015(E)
Motorcycles — Verification of total running resistance
force during mode running on a chassis dynamometer
1 Scope
This International Standard specifies the verification method of total running resistance force when
the exhaust gas emissions and/or fuel consumption of motorcycles are measured during mode running
on a chassis dynamometer. The performance of chassis dynamometer is verified by comparing the
measured total running resistance force (measured by a chassis dynamometer absorption force) and
the target total running resistance force (calculated from velocity, acceleration and/or deceleration).
This International Standard is applicable when the running resistance force of a chassis dynamometer
is set in accordance with ISO 11486.
2  Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
equivalent inertia mass of motorcycle
m
i
mass obtained by adding the rotating mass of the front wheel to the total mass of the motorcycle, rider
and instruments
2.2
mechanical equivalent inertia mass of chassis dynamometer
m
b
equivalent inertia mass of mechanical rotating parts of chassis dynamometer, e.g. roller and shaft
and/or fly wheel
2.3
chassis dynamometer absorption force
F
dy
tangential force acted on the roller surface which is calculated from a roller shaft or motor cradling
torque and roller radius
Note 1 to entry: The chassis dynamometer absorption force is the running resistance force for a chassis dynamometer
equipped with a mechanical flywheel equivalent inertia mass system and is sum of running resistance force and
inertia force generated by motorcycles for a chassis dynamometer using the electric inertia function.
2.4
total friction loss of a chassis dynamometer
F
f
friction and aerodynamic loss of rotating parts of chassis dynamometer, e.g. bearings and roller(s)
2.5
running resistance force
rolling resistance and aerodynamic loss of motorcycle on flat surface
2.6
inertia force
force generated by inertia mass of motorcycle or chassis dynamometer during acceleration and/or
deceleration
2.7
total running resistance force
sum of running resistance force and inertia force of motorcycle
2.8
target total running resistance force
F
tg
total running resistance force calculated in accordance with equivalent inertia mass of motorcycle,
velocity, acceleration and/or deceleration
2.9
measured total running resistance force
F
m
sum of the chassis dynamometer absorption force, total friction loss of chassis dynamometer and an
inertia force generated by the mechanical equivalent inertia mass of chassis dynamometer
2.10
target integral work
W
tg
integral work calculated in accordance with measured velocity and F during test mode running,
tg
in kilo joule
2.11
measured integral work
W
m
integral work calculated in accordance with measured velocity and F during test mode running,
m
in kilo joule
3  Symbols
Table 1 — Symbols
Symbols Definition Unit
A slope of the regression line —
a rolling resistance of front wheel N
B intercept of the regression line —
b coefficient proportional to motorcycle speed N/(km/h)
c aerodynamic drag coefficient N/(km/h)
e integral work error %
W
F tangential force acted on the roller surface N
dy
F friction and aerodynamic loss of rotating parts of chassis dynamometer N
f
F target total running resistance force N
tg
F the i-th data of F data sets N
tg,i tg
F measured total running resistance force N
m
F the i-th data of F data sets N
m,i m
m equivalent inertia mass of mechanical rotating parts of chassis dynamometer kg
b
mass obtained by adding the rotating mass of the front wheel to the total mass of
m kg
i
the motorcycle, rider and instruments
T time s
V roller rotational speed km/h
W target integral work J
tg
W measured integral work J
m
2 © ISO 2015 – All rights reserved

Table 1 (continued)
Symbols Definition Unit
γ correlation coefficient —
σ standard deviation —
σ relative standard deviation (cov: coefficient of variation) %
cov
4  Verification
4.1  Principle
The equivalence between the target and measured total running resistance force is verified by the
linear regression statistical analysi
...