ISO/TR 5262:2023

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 2023
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ii
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
Foreword
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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
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
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.
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)
c aerodynamic drag coefficient N/(km/h)
CO carbon monoxide g/km
CO carbon dioxide g/km
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
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 were investigated (Figure 3).
Table 1 shows the ISO 18580 evaluation items and Table 2 shows each vehicle'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 th
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