1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 6855-1:2012 Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 1: General test requirementsBS ISO 6855-1:2012 BRITISH STANDARD National f
2、oreword This 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 Together with BS ISO 6855-2:2012 and BS ISO 6855-3:2012, it supersedes BS ISO 7859:2000, which is withdrawn.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
3、 c y c l 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 Instit
4、ution 2012. 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 201
5、2. Amendments issued since publication Date T e x t a f f e c t e dBS ISO 6855-1:2012 ISO 2012 Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 1: General test requirements Cyclomoteurs Mthode de mesure des missions de gaz polluants et de consommation de combustible
6、Partie 1: Exigences gnrales dessai INTERNATIONAL STANDARD ISO 6855-1 First edition 2012-09-15 Reference number ISO 6855-1:2012(E)BS ISO 6855-1:2012ISO 6855-1:2012(E) ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 All rights reserved. Unless otherwise specified, no part of this
7、 publication may be reproduced 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 office Case postale 56 CH-1211
8、 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO 6855-1:2012ISO 6855-1:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword v Introduction vi 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 S
9、ymbols 2 5 Standard reference conditions 4 6 Tests . 4 6.1 Measurement of gaseous exhaust emissions 4 6.2 Measurement of fuel consumption 5 7 Measurement equipment 5 7.1 Chassis dynamometer . 5 7.2 Gas-collection equipment 5 7.3 Analytical equipment 6 7.4 Cooling equipment. 6 7.5 Fuel consumption me
10、asurement . 7 7.6 Accuracy of instruments and measurements . 7 8 Preparing the test 8 8.1 Engine fuel and lubricants 8 8.2 Description of the test moped 8 8.3 Conditioning/preparation of the test moped . 8 8.4 Adjustment of the analytical apparatus . 8 9 System check procedure . 9 9.1 Accuracy of th
11、e CVS system . 9 9.2 Metering a constant flow of pure gas (CO or C 3 H 8 ) using a critical flow orifice 9 9.3 Metering a limited quantity of pure gas (CO or C 3 H 8 ) by means of a gravimetric technique . 9 10 Procedure for sampling, analysing and measuring the volume of gaseous exhaust emissions .
12、 9 10.1 Operations to be carried out before the moped start up 9 10.2 Beginning of sampling and volume measurement 12 10.3 End of sampling and volume measurement .12 10.4 Analysis.12 10.5 Measuring the driving distance .13 10.6 Open type CVS system .13 11 Determination of the quantity of gaseous exh
13、aust emissions .13 11.1 Total diluted exhaust mixture volume corrected to the standard reference conditions 13 11.2 Exhaust gas sampling and the dilution factor .14 11.3 Mass of the gaseous exhaust emissions 14 12 Determination of the fuel consumption 16 12.1 Carbon balance method .16 12.2 Fuel flow
14、 measurement method .17 12.3 Calculation of results in litres per 100 km .18 12.4 Criteria of the statistical accuracy for the fuel consumption measurements 18 Annex A (normative) Method and equipment for measuring fuel c onsumption b y the fuel flo w measurement method 19 Annex B (informative) Ex a
15、mple for r ec or d form of t est fuel specifications .30 Annex C (informative) Exhaust gas leakage check procedure for the open type CVS system.31BS ISO 6855-1:2012ISO 6855-1:2012(E) iv ISO 2012 All rights reserved Annex D (informative) Determination of the dilution factor .36 Annex E (informative)
16、Principle of the carbon balance method 44 Annex F (informative) Simplified det ermination method of the at om number r atio of h y dr ogen and carbon, and that of oxygen and carbon in gasoline .47 Annex G (normative) Fuel consumption for two-stroke engines .49 Annex H (informative) Criteria of the s
17、tatistical accuracy for the fuel consumption measurements 50 Bibliography .52BS ISO 6855-1:2012ISO 6855-1:2012(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standard
18、s 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
19、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 t
20、o 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
21、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 6855-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 23, Mopeds. ISO 6855-1 cancels and replaces ISO 68
22、55:1983 and ISO 7859:2000, both of which have been technically revised. ISO 6855 consists of the following parts, 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 P
23、art 3: Fuel consumption measurement at a constant speed ISO 2012 All rights reserved vBS ISO 6855-1:2012ISO 6855-1:2012(E) Introduction For measurement of moped fuel consumption, the carbon balance method, where the fuel consumption is calculated from analysis of the carbon quantity in the exhaust g
24、as, is now widely used in addition to the conventional fuel flow measurement. Therefore, the measurement of exhaust 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 b
25、y ISO 6855:1983 and by ISO 7859:2000. This part of ISO 6855 defines fundamental elements such as the measurement 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
26、 part of ISO 6855 and ISO 6855-2. Together with ISO 6855-3, they also give details of those measurements at a constant 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 meas
27、urement of exhaust gas at a lower level is required: cleaning of the background air (i.e the air in the test room 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 evapo
28、rated fuel from the test moped. In addition to the above future issues, the chassis dynamometer with electrically simulated 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 developme
29、nt. vi ISO 2012 All rights reservedBS ISO 6855-1:2012Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 1: General test requirements 1 Scope This part of ISO 6855 specifies the general test requirements for measurement for the gaseous exhaust emissions from mopeds, and
30、 for determining the fuel consumption of mopeds as defined in ISO 3833. It is applicable to mopeds equipped with a spark ignition engine (four-stroke engine, two-stroke engine or rotary piston engine). 2 Normative references The following referenced documents are indispensable for the application of
31、 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 3833, Road vehicles Types Terms and definitions ISO 6855-2:2012,Mopeds Measurement method for gaseous exhaust emissions
32、and fuel consumption Part 2: Test cycles and specific test conditions ISO 6855-3:2012, Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 3: Fuel consumption measurement at a constant speed ISO 28981, Mopeds Methods for setting the running resistance on a chassis dynam
33、ometer 3 T erms a nd definiti ons For the purposes of this document, the terms and definitions given in ISO 3833 and the following apply. 3.1 moped kerb mass dry 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 manufac
34、turer; auxiliary equipment usually supplied by the manufacturer in addition to that necessary for normal operation tool-kit, carrier(s), windscreen(s), protective equipment, etc. 3.2 reference mass of the moped kerb mass of the moped increased by a uniform figure of 75 kg, which represents the mass
35、of a rider 3.3 equivalent inertia total inertia of the rotating masses of the test bench, determined with respect to the reference mass of the moped INTERNATIONAL ST ANDARD ISO 6855-1:2012(E) ISO 2012 All rights reserved 1BS ISO 6855-1:2012ISO 6855-1:2012(E) 3.4 gaseous exhaust emissions carbon mono
36、xide, hydrocarbons, nitrogen oxides (gaseous pollutants) and carbon dioxide emitted from mopeds 4 Symbols Table 1 Symbols Symbols D e f i n i t ion Unit a a mixing ratio of lubrication oil and fuel c CO,d carbon monoxide concentration in the dilution air ppm c CO,dm carbon monoxide concentration in
37、the dilution air with the water vapour and carbon dioxide absorbent ppm c CO,e carbon monoxide concentration in the diluted exhaust mixture ppm c CO,ec volumetric concentration of carbon monoxide in the diluted exhaust mixture, cor- rected to take account of carbon monoxide in the dilution air ppm c
38、 CO,em carbon monoxide concentration in the diluted exhaust mixture with the water vapour and carbon dioxide absorbent ppm c CO2,d carbon dioxide concentration in the dilution air % c CO2,e carbon dioxide concentration in the diluted exhaust mixture % c CO2,ec volumetric concentration of carbon diox
39、ide in the diluted exhaust mixture, corrected to take account of carbon dioxide in the dilution air % c NOx,d nitrogen oxides concentration in the dilution air ppm c NOx,e nitrogen oxides concentration in the diluted exhaust mixture ppm c NOx,ec volumetric concentration of nitrogen oxides in the dil
40、uted exhaust mixture, cor- rected to take account of nitrogen oxides in the dilution air ppm c O2,d oxygen concentration in the dilution air % c Pi,ec concentration of the pollutant i in the diluted exhaust mixture, corrected to take account of the amount of the pollutant i contained in the dilution
41、 air ppm c THC,d hydrocarbon concentration in the dilution air as measured in parts per million car- bon equivalent ppmC c THC,e hydrocarbon concentration in the diluted exhaust mixture as measured in parts per million carbon equivalent ppmC c THC,ec volumetric concentration, expressed in parts per
42、million carbon equivalent, of hydrocarbon in the diluted exhaust mixture, corrected to take account of hydrocar- bon in the dilution air ppmC D f dilution factor F c specific fuel consumption km/L F c specific fuel consumption for lubrication oil mixed fuel km/L F c100 fuel consumption per 100 km L/
43、100 km F o lubrication oil consumption for the mixed fuel km/L H a absolute humidity in grams of water per kilogram of dry air H d relative humidity of dilution air % H r relative humidity in the test room % H 0 standard relative humidity % appm = parts per million. 2 ISO 2012 All rights reservedBS
44、ISO 6855-1:2012ISO 6855-1:2012(E) Symbols D e f i n i t ion Unit a K H humidity correction factor used for the calculation of the mass emissions of nitrogen oxides K 1 venturi correction factor K 2 ratio of pressure to temperature at the standard reference conditions L running distance actually trav
45、elled km m CO mass of carbon monoxide in the exhaust gas g/km m CO2 mass of carbon dioxide in the exhaust gas g/km m f fuel consumed g m NOx mass of nitrogen oxides in the exhaust gas g/km m Pi mass emission of the pollutant i g m THC mass of hydrocarbon in the exhaust gas g/km N number of revolutio
46、ns of positive displacement pump during the test while samples are being collected p a mean barometric pressure during the test in the test room kPa p d saturated water vapour pressure during the test in the test room kPa p p diluted exhaust mixture absolute pressure at the inlet of positive displac
47、ement pump kPa p V absolute pressure at the venturi inlet kPa p V (t) absolute pressure of the diluted exhaust mixture at the venturi inlet kPa p 0 total barometric pressure at the standard reference conditions kPa Q a measured flow rate of venturi at ambient conditions L/s Q cal measured flow rate
48、of venturi using the other gas flowmeter L/s R HC,ex atom number ratio of hydrogen and carbon in the exhaust gas R HC,ex atom number ratio of hydrogen and carbon in the exhaust gas for lubrication oil mixed fuel R HC,f atom number ratio of hydrogen and carbon in the fuel R HC,o atom number ratio of
49、hydrogen and carbon in the lubrication oil R OC,ex atom number ratio of oxygen and carbon in the exhaust gas R OC,ex atom number ratio of oxygen and carbon in the exhaust gas for lubrication oil mixed fuel R OC,f atom number ratio of oxygen and carbon in the fuel R OC,o atom number ratio of oxygen and carbon in the lubrication oil r 0 relative air density at the standard reference conditions t time s t test total test time s T a measured ambient temperature
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