1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 6855-1:2012Mopeds Measurement method for gaseous exhaust emissions and fuel consumptionPart 1: General test requirementsBS ISO 6855-1:2012 BRITISH STANDARDNational forewor
2、dThis British Standard is the UK implementation of ISO 6855-1:2012. Together with BS ISO 6855-2:2012 and BS ISO 6855-3:2012, it supersedes BS ISO 7859:2000, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e A U E / 1 4 , M o t o r c y c l
3、 e s a n d m o p e d s .A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012
4、. Published by BSI Standards Limited 2012.ISBN 978 0 580 68463 0 ICS 13.040.50; 43.140 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2012.Amendments
5、 issued since publicationDate T e x t a f f e c t e dBS ISO 6855-1:2012 ISO 2012Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 1: General test requirementsCyclomoteurs Mthode de mesure des missions de gaz polluants et de consommation de combustible Partie 1: Exigen
6、ces gnrales dessaiINTERNATIONAL STANDARDISO6855-1First edition2012-09-15Reference numberISO 6855-1:2012(E)BS ISO 6855-1:2012ISO 6855-1:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be reprod
7、uced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 0
8、1 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 6855-1:2012ISO 6855-1:2012(E) ISO 2012 All rights reserved iiiContents PageForeword vIntroduction vi1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols 25 Standard reference conditions 4
9、6 Tests . 46.1 Measurement of gaseous exhaust emissions 46.2 Measurement of fuel consumption 57 Measurement equipment 57.1 Chassis dynamometer . 57.2 Gas-collection equipment 57.3 Analytical equipment 67.4 Cooling equipment. 67.5 Fuel consumption measurement . 77.6 Accuracy of instruments and measur
10、ements . 78 Preparing the test 88.1 Engine fuel and lubricants 88.2 Description of the test moped 88.3 Conditioning/preparation of the test moped . 88.4 Adjustment of the analytical apparatus . 89 System check procedure . 99.1 Accuracy of the CVS system . 99.2 Metering a constant flow of pure gas (C
11、O or C3H8) using a critical flow orifice 99.3 Metering a limited quantity of pure gas (CO or C3H8) by means of a gravimetric technique . 910 Procedure for sampling, analysing and measuring the volume of gaseous exhaust emissions . 910.1 Operations to be carried out before the moped start up 910.2 Be
12、ginning of sampling and volume measurement 1210.3 End of sampling and volume measurement .1210.4 Analysis. 1210.5 Measuring the driving distance . 1310.6 Open type CVS system . 1311 Determination of the quantity of gaseous exhaust emissions .1311.1 Total diluted exhaust mixture volume corrected to t
13、he standard reference conditions 1311.2 Exhaust gas sampling and the dilution factor . 1411.3 Mass of the gaseous exhaust emissions 1412 Determination of the fuel consumption 1612.1 Carbon balance method . 1612.2 Fuel flow measurement method . 1712.3 Calculation of results in litres per 100 km . 181
14、2.4 Criteria of the statistical accuracy for the fuel consumption measurements 18Annex A (normative) Method and equipment for measuring fuel consumption by the fuel flow measurement method 19Annex B (informative) Example for record form of test fuel specifications .30Annex C (informative) Exhaust ga
15、s leakage check procedure for the open type CVS system.31BS ISO 6855-1:2012ISO 6855-1:2012(E)iv ISO 2012 All rights reservedAnnex D (informative) Determination of the dilution factor .36Annex E (informative) Principle of the carbon balance method 44Annex F (informative) Simplified determination meth
16、od of the atom number ratio of hydrogen and carbon, and that of oxygen and carbon in gasoline .47Annex G (normative) Fuel consumption for two-stroke engines .49Annex H (informative) Criteria of the statistical accuracy for the fuel consumption measurements 50Bibliography .52BS ISO 6855-1:2012ISO 685
17、5-1:2012(E)ForewordISO (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
18、 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 a
19、ll 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 c
20、irculated 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 respo
21、nsible for identifying any or all such patent rights.ISO 6855-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 23, Mopeds.ISO 6855-1 cancels and replaces ISO 6855:1983 and ISO 7859:2000, both of which have been technically revised.ISO 6855 consists of the following par
22、ts, under the general title Mopeds 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 ISO 2012 All rights reserved vBS ISO 6855-1:2012ISO 68
23、55-1:2012(E)IntroductionFor measurement of moped fuel consumption, the carbon balance method, where the fuel consumption is calculated from analysis of the carbon quantity in the exhaust gas, is now widely used in addition to the conventional fuel flow measurement. Therefore, the measurement of exha
24、ust gas and that of fuel consumption are inseparably related to each other.ISO 6855 now covers in one single series of standards the two subjects that were previously covered separately by ISO 6855:1983 and by ISO 7859:2000. This part of ISO 6855 defines fundamental elements such as the measurement
25、accuracy, test vehicle conditions and the details of the carbon balance method. Measurement of gaseous exhaust gas emissions and fuel consumption of test cycles can be conducted with this part of ISO 6855 and ISO 6855-2. Together with ISO 6855-3, they also give details of those measurements at a con
26、stant speed.While the most up-to-date technologies are reflected in the ISO 6855 series, further technical development in the following aspects will be necessary in the future, when measurement of exhaust gas at a lower level is required: cleaning of the background air (i.e the air in the test room
27、which is used for the dilution air); heating of the sampling line; control of the test room humidity; the exhaust gas analysis system for low-level emissions; consideration for the evaporated fuel from the test moped.In addition to the above future issues, the chassis dynamometer with electrically s
28、imulated inertia is at the stage of practical application. Standardization of the verification method and the allowance of simulated inertia would be necessary for this recent development.vi ISO 2012 All rights reservedBS ISO 6855-1:2012Mopeds Measurement method for gaseous exhaust emissions and fue
29、l consumption Part 1: General test requirements1 ScopeThis part of ISO 6855 specifies the general test requirements for measurement for the gaseous exhaust emissions from mopeds, and for determining the fuel consumption of mopeds as defined in ISO 3833. It is applicable to mopeds equipped with a spa
30、rk ignition engine (four-stroke engine, two-stroke engine or rotary piston engine).2 Normative referencesThe 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
31、referenced document (including any amendments) applies.ISO 3833, Road vehicles Types Terms and definitionsISO 6855-2:2012,Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 2: Test cycles and specific test conditionsISO 6855-3:2012, Mopeds Measurement method for gaseou
32、s exhaust emissions and fuel consumption Part 3: Fuel consumption measurement at a constant speedISO 28981, Mopeds Methods for setting the running resistance on a chassis dynamometer3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 3833 and the followin
33、g apply.3.1moped kerb massdry mass of the moped to which is added the mass of the following: fuel: tank filled at least to 90 % of the capacity specified by the manufacturer; auxiliary equipment usually supplied by the manufacturer in addition to that necessary for normal operation tool-kit, carrier
34、(s), windscreen(s), protective equipment, etc.3.2reference mass of the mopedkerb mass of the moped increased by a uniform figure of 75 kg, which represents the mass of a rider3.3equivalent inertiatotal inertia of the rotating masses of the test bench, determined with respect to the reference mass of
35、 the mopedINTERNATIONAL STANDARD ISO 6855-1:2012(E) ISO 2012 All rights reserved 1BS ISO 6855-1:2012ISO 6855-1:2012(E)3.4gaseous exhaust emissionscarbon monoxide, hydrocarbons, nitrogen oxides (gaseous pollutants) and carbon dioxide emitted from mopeds4 SymbolsTable 1 SymbolsSymbols Definition Unit
36、aa mixing ratio of lubrication oil and fuel cCO,dcarbon monoxide concentration in the dilution air ppmcCO,dmcarbon monoxide concentration in the dilution air with the water vapour and carbon dioxide absorbentppmcCO,ecarbon monoxide concentration in the diluted exhaust mixture ppmcCO,ecvolumetric con
37、centration of carbon monoxide in the diluted exhaust mixture, cor-rected to take account of carbon monoxide in the dilution airppmcCO,emcarbon monoxide concentration in the diluted exhaust mixture with the water vapour and carbon dioxide absorbentppmcCO2,dcarbon dioxide concentration in the dilution
38、 air %cCO2,ecarbon dioxide concentration in the diluted exhaust mixture %cCO2,ecvolumetric concentration of carbon dioxide in the diluted exhaust mixture, corrected to take account of carbon dioxide in the dilution air%cNOx,dnitrogen oxides concentration in the dilution air ppmcNOx,enitrogen oxides
39、concentration in the diluted exhaust mixture ppmcNOx,ecvolumetric concentration of nitrogen oxides in the diluted exhaust mixture, cor-rected to take account of nitrogen oxides in the dilution airppmcO2,doxygen concentration in the dilution air %cPi,ecconcentration of the pollutant i in the diluted
40、exhaust mixture, corrected to take account of the amount of the pollutant i contained in the dilution airppmcTHC,dhydrocarbon concentration in the dilution air as measured in parts per million car-bon equivalentppmCcTHC,ehydrocarbon concentration in the diluted exhaust mixture as measured in parts p
41、er million carbon equivalentppmCcTHC,ecvolumetric concentration, expressed in parts per million carbon equivalent, of hydrocarbon in the diluted exhaust mixture, corrected to take account of hydrocar-bon in the dilution airppmCDfdilution factor Fcspecific fuel consumption km/LFcspecific fuel consump
42、tion for lubrication oil mixed fuel km/LFc100fuel consumption per 100 km L/100 kmFolubrication oil consumption for the mixed fuel km/LHaabsolute humidity in grams of water per kilogram of dry air Hdrelative humidity of dilution air %Hrrelative humidity in the test room %H0standard relative humidity
43、%appm = parts per million.2 ISO 2012 All rights reservedBS ISO 6855-1:2012ISO 6855-1:2012(E)Symbols Definition Unit aKHhumidity correction factor used for the calculation of the mass emissions of nitrogen oxidesK1venturi correction factor K2ratio of pressure to temperature at the standard reference
44、conditions L running distance actually travelled kmmCOmass of carbon monoxide in the exhaust gas g/kmmCO2mass of carbon dioxide in the exhaust gas g/kmmffuel consumed gmNOxmass of nitrogen oxides in the exhaust gas g/kmmPimass emission of the pollutant i gmTHCmass of hydrocarbon in the exhaust gas g
45、/kmN number of revolutions of positive displacement pump during the test while samples are being collectedpamean barometric pressure during the test in the test room kPapdsaturated water vapour pressure during the test in the test room kPappdiluted exhaust mixture absolute pressure at the inlet of p
46、ositive displacement pump kPapVabsolute pressure at the venturi inlet kPapV(t) absolute pressure of the diluted exhaust mixture at the venturi inlet kPap0total barometric pressure at the standard reference conditions kPaQameasured flow rate of venturi at ambient conditions L/sQcalmeasured flow rate
47、of venturi using the other gas flowmeter L/sRHC,exatom number ratio of hydrogen and carbon in the exhaust gas RHC,exatom number ratio of hydrogen and carbon in the exhaust gas for lubrication oil mixed fuelRHC,fatom number ratio of hydrogen and carbon in the fuel RHC,oatom number ratio of hydrogen a
48、nd carbon in the lubrication oil ROC,exatom number ratio of oxygen and carbon in the exhaust gas ROC,exatom number ratio of oxygen and carbon in the exhaust gas for lubrication oil mixed fuelROC,fatom number ratio of oxygen and carbon in the fuel ROC,oatom number ratio of oxygen and carbon in the lu
49、brication oil r0relative air density at the standard reference conditions t time sttesttotal test time sTameasured ambient temperature during the test in the test room KTffuel temperature measured at the burette KTptemperature of diluted exhaust mixture at the positive displacement pump inlet dur-ing the test while samples are being collectedKTvtemperature at the venturi inlet KTv(t) temperature of diluted exhaust mixture at the venturi inlet KT0air temperature at the standard reference
