ISO 6460-1:2022

INTERNATIONAL ISO
STANDARD 6460-1
Second edition
2022-02
Motorcycles — Measurement method
for gaseous exhaust emissions and
fuel consumption —
Part 1:
General test requirements
Motocycles — Méthode de mesure des émissions de gaz
d'échappement et de la consommation de carburant —
Partie 1: Exigences générales d'essai
Reference number
© ISO 2022
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Published in Switzerland
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Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Standard reference conditions . 5
6 Tests . 5
6.1 Measurement of gaseous exhaust emissions . 5
6.1.1 Average gaseous exhaust emissions during conventional test cycles . 5
6.1.2 Measurement of gaseous exhaust emissions at an idling speed . 5
6.2 Measurement of fuel consumption . 5
6.2.1 Average fuel consumption during conventional test cycles . 5
6.2.2 Fuel consumption at a constant speed . 5
7 Measurement equipment . 5
7.1 General . 5
7.2 Chassis dynamometer . 5
7.3 Gas-collection equipment . 5
7.4 Analytical equipment . 7
7.5 Cooling equipment . 8
7.6 Fuel consumption measurement . 8
7.7 Accuracy of instruments and measurements . 9
8 Preparing the test . 9
8.1 Engine fuel and lubricants . 9
8.2 Description of the test motorcycle . 9
8.3 Conditioning/preparation of the test motorcycle . 9
8.4 Calibration and adjustment of analysers . 10
8.4.1 Calibration of the analysers . 10
8.4.2 Adjustment of the analysers . 11
8.4.3 Reference gases and accuracy of the mixing device .13
9 CVS system check procedure .13
10 Procedure for sampling, analysing and measuring the volume of gaseous exhaust
emissions .14
10.1 Operations to be carried out before the test motorcycle start up . 14
10.2 Beginning of sampling and volume measurement. 17
10.3 End of sampling and volume measurement . 17
10.4 Analysis . 17
10.5 Measuring the driving distance . 18
10.6 Open type CVS system . 18
11 Determination of the quantity of gaseous exhaust emissions .18
11.1 Total diluted exhaust mixture volume corrected to the standard reference
conditions . 18
11.1.1 Total diluted exhaust mixture volume for the CVS system with CFV . 18
11.1.2 Total diluted exhaust mixture volume for the CVS system with PDP . 19
11.1.3 Total diluted exhaust mixture volume for the CVS system with SSV . 19
11.2 Exhaust emissions sampling and the dilution factor . 20
11.2.1 Exhaust emissions sampling . 20
11.2.2 Dilution factor . 20
11.3 Mass of the gaseous exhaust emissions . 21
11.3.1 Mass of carbon monoxide . 21
iii
11.3.2 Mass of total hydrocarbons . 22
11.3.3 Mass of non-methane hydrocarbons . 22
11.3.4 Mass of nitrogen oxides . 24
11.3.5 Mass of carbon dioxide .25
12 Determination of the fuel consumption .25
12.1 Carbon balance method .25
12.1.1 Fuel consumption for four-stroke engines . 25
12.1.2 Calculation of results in litres per 100 km . 26
12.2 Fuel flow measurement method . 26
12.2.1 Fuel consumption for four-stroke engines . 27
12.2.2 Calculation of results in litres per 100 km . 27
Annex A (normative) Method and equipment for measuring fuel consumption by the fuel
flow measurement method .28
Annex B (informative) Example for record form of test fuel specifications.39
Annex C (informative) Exhaust emissions leakage check procedure for the open type CVS
system.40
Annex D (informative) Determination of the dilution factor .46
Annex E (informative) Principle of the carbon balance method for four-stroke engines .55
Annex F (informative) Simplified determination method of the atom number ratio of
hydrogen and carbon, and that of oxygen and carbon in gasoline .56
Annex G (informative) CVS system check procedure .57
Bibliography .58
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Foreword
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