ISO 6460-3:2007

INTERNATIONAL ISO
STANDARD 6460-3
First edition
2007-08-01

Motorcycles — Measurement method for
gaseous exhaust emissions and fuel
consumption —
Part 3:
Fuel consumption measurement at a
constant speed
Motocycles — Méthode de mesure des émissions de gaz
d'échappement et de la consommation de carburant —
Partie 3: Mesurage de la consommation de carburant à vitesse
constante




Reference number
ISO 6460-3:2007(E)
©
ISO 2007

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ISO 6460-3:2007(E)
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ISO 6460-3:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Symbols . 2
5 General requirements. 2
6 Road measurement method . 3
6.1 Rider and riding position . 3
6.2 Test track . 3
6.3 Ambient conditions for the road test. 3
6.4 Measuring instruments on the test motorcycle for the road test . 4
6.5 Test method. 4
7 Chassis dynamometer measurement method. 5
7.1 Test method. 5
8 Presentation of results. 6
Annex A (normative) Determination method of fuel consumption . 7
Annex B (normative) Presentation of results of fuel consumption . 9
Bibliography . 14

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ISO 6460-3:2007(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 6460-3 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 22,
Motorcycles.
ISO 6460-3, together with ISO 6460-1 and ISO 6460-2, cancels and replaces ISO 6460:1981 and
ISO 7860:1995, which have been technically revised.
ISO 6460 consists of the following parts, under the general title Motorcycles — Measurement method for
gaseous exhaust emissions and fuel consumption:
⎯ Part 1: General test requirements
⎯ Part 2: Test cycles and specific test conditions
⎯ Part 3: Fuel consumption measurement at a constant speed
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ISO 6460-3:2007(E)
Introduction
This part of ISO 6460 defines specific requirements for the measurement of fuel consumption at a constant
speed. The measurement can be carried out by referring to this part of ISO 6460 and to ISO 6460-1.

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INTERNATIONAL STANDARD ISO 6460-3:2007(E)

Motorcycles — Measurement method for gaseous exhaust
emissions and fuel consumption —
Part 3:
Fuel consumption measurement at a constant speed
1 Scope
This part of ISO 6460 specifies the methods of measurement for fuel consumption at a constant speed on the
road and on the chassis dynamometer. It is applicable to motorcycles as defined in ISO 3833 equipped with a
spark ignition engine (four-stroke engine, two-stroke engine or rotary piston engine) or a compression ignition
engine.
2 Normative references
The following referenced documents are indispensable for the application 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 6460-1:2007, Motorcycles — Measurement method for gaseous exhaust emissions and fuel
consumption — Part 1: General test requirements
ISO 7117, Motorcycles — Measurement of maximum speed
ISO 11486, Motorcycles — Methods for setting running resistance on a chassis dynamometer
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
target test speed
constant speed at which the motorcycle is tested.
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ISO 6460-3:2007(E)
4 Symbols
Table 1 — Symbols
Symbols Definition Unit
3
d
relative air density during the test kg/m
T
3
d
relative air density at the standard reference conditions kg/m
0
F
specific fuel consumption of the first test km/L
c,ai
F specific fuel consumption of the second test km/L
c,bi
F
average specific fuel consumption of first and second tests km/L
c,i
F mean value of average specific fuel consumptions km/L
c,j
L
test section length to measure the fuel consumption km
road
p
total barometric pressure during the test kPa
T
p total barometric pressure at the standard reference conditions kPa
0
T
air temperature during the test K
T
T
air temperature at the standard reference conditions K
0
t
time during the measurement of fuel consumption of the first test h
c,ai
t
time during the measurement of fuel consumption of the second test h
c,bi
V measured volume of consumed fuel during the first test L
c,ai
V
measured volume of consumed fuel during the second test L
c,bi
v
motorcycle speed during the first test km/h
c,ai
v motorcycle speed during the second test km/h
c,bi
v
average motorcycle speed of first and second tests km/h
c,i
v
mean value of average motorcycle speeds km/h
c,j
v
target test speed km/h
T

5 General requirements
5.1 Measurement of fuel consumption of a motorcycle based on the constant speed method shall be
performed on a road or on a chassis dynamometer.
5.2 Fuel shall be supplied to the engine by a device capable of measuring the quantity of fuel supplied with
an accuracy of ± 1 %, and which does not interfere with the supply of fuel to the engine. Where the measuring
system is volumetric, the temperature of fuel in the device or in the outlet of the device shall be measured.
5.3 Switching from the normal supply system to the measuring supply system shall be effected by a valve
system and shall take no more than 0,2 s.
5.4 ISO 6460-1:2007, Annex A, gives the description and the methods of use of the appropriate devices.
The carbon balance method can also be applied for the measurement of fuel consumption on the chassis
dynamometer.
5.5 Before the test, all parts of the motorcycle shall be stabilized at the normal temperature for the
motorcycle in use.
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ISO 6460-3:2007(E)
5.6 The total test mass, including the masses of the rider and the instruments, shall be measured before
the beginning of the test.
5.7 The test shall be performed at a constant speed in the highest gear. A lower gear may be selected in
case the test motorcycle cannot be run stably: the gear used shall be reported in test results.
6 Road measurement method
6.1 Rider and riding position
6.1.1 The rider shall wear a close-fitting suit (one-piece) or similar clothing, a protective helmet, eye
protection, boots and gloves.
6.1.2 The rider in the conditions given in 6.1.1 shall have a mass of 75 kg ± 5 kg and be 1,75 m ± 0,05 m
tall.
6.1.3 The rider shall be seated on the seat provided, with his/her feet on the footrests and his/her arms
normally extended. This position shall allow the rider at all times to have proper control of the motorcycle
during the test.
The position of the rider should remain unchanged during the whole measurement: the description of the
position shall be indicated in the test report or shall be replaced by photograph(s).
6.2 Test track
6.2.1 The total length of test track shall be the sum of the following sections:
a) the acceleration section to reach the stabilized target test speed;
b) the test section to measure the fuel consumption;
c) the deceleration section to stop the test motorcycle safely.
6.2.2 The test section shall be either long enough to consume the fuel of at least 10 mL or be longer than
300 m. The length of the test section shall be measured within the tolerance of 0,1 %.
6.2.3 The test road shall be flat, level, straight and smoothly paved. The road surface shall be dry and
covered with asphalt, concrete or similar material, and free of obstacles or wind barriers that might impede the
measurement of the fuel consumption. The slope of the surface shall not exceed 0,5 % between any two
points at least 2 m apart.
6.3 Ambient conditions for the road test
During data collecting periods, the wind shall be steady. The wind speed and the direction of the wind shall be
measured continuously or with adequate frequency at a location where the wind force during fuel consumption
masurement is representative.
The ambient conditions shall be within the following limits:
a) maximum wind speed: 3 m/s;
b) maximum wind speed for gust: 5 m/s;
c) average wind speed, parallel: 3 m/s;
d) average wind speed, perpendicular: 2 m/s;
e) maximum relative humidity: 95 %;
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ISO 6460-3:2007(E)
f) air temperature: 278 K to 308 K.
The relative air density during the test, d , shall be calculated by Equation (1):
T
p T
T 0
dd=× × (1)
T0
p T
0T
The standard reference conditions are specified in ISO 6460-1:2007, Clause 5.
The relative air density during the test shall not differ by more than 7,5 % from the standard relative air density
in ISO 6460-1:2007, Clause 5.
6.4 Measuring instruments on the test motorcycle for the road test
When installing the measuring instruments on the test motorcycle, care shall be taken to minimize their effect
on the di
...