1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 6855-3:2012Mopeds Measurement method for gaseous exhaust emissions and fuel consumptionPart 3: Fuel consumption measurement at a constant speedBS ISO 6855-3:2012 BRITISH S
2、TANDARDNational forewordThis British Standard is the UK implementation of ISO 6855-3:2012. Together with BS ISO 6855-1:2012 and BS ISO 6855-2:2012, it supersedes BS ISO 7859:2000, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e A U E /
3、1 4 , M o t o r 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 Sta
4、ndards Institution 2012. Published by BSI Standards Limited 2012.ISBN 978 0 580 68465 4 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
5、October 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 6855-3:2012 ISO 2012Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 3: Fuel consumption measurement at a constant speedCyclomoteurs Mthode de mesure des missions de gaz polluants et d
6、e consommation de combustible Partie 3: Mesure de consommation de combustible vitesse constanteINTERNATIONAL STANDARDISO6855-3First edition2012-09-15Reference numberISO 6855-3:2012(E)BS ISO 6855-3:2012ISO 6855-3:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights re
7、served. Unless otherwise specified, no part of this 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 requ
8、ester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 6855-3:2012ISO 6855-3:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative refere
9、nces 13 Terms and definitions . 14 Symbols 25 General requirements . 26 Road measurement method . 36.1 Rider and riding position . 36.2 Test track 36.3 Ambient conditions for the road test . 36.4 Measuring instruments on the test moped for the road test 46.5 Test method . 47 Chassis dynamometer meas
10、urement method . 57.1 Test method . 58 Presentation of results . 6Annex A (normative) Determination method of fuel consumption . 7Annex B (normative) Presentation of results of fuel consumption 9Bibliography .15BS ISO 6855-3:2012ISO 6855-3:2012(E)ForewordISO (the International Organization for Stand
11、ardization) 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
12、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 Sta
13、ndards 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 Int
14、ernational 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 6855-3
15、was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 23, Mopeds.ISO 6855-3 cancels and replaces ISO 6855:1983and ISO 7859:2000, which have been technically revised.ISO 6855 consists of the following parts, under the general title Mopeds Measurement method for gaseous exhaust
16、 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 speediv ISO 2012 All rights reservedBS ISO 6855-3:2012ISO 6855-3:2012(E)IntroductionThis part of ISO 6855 defines specific requiremen
17、ts for measurement of fuel consumption at a constant speed. The measurement can be carried out by referring to this part of ISO 6855 and ISO 6855-1. ISO 2012 All rights reserved vBS ISO 6855-3:2012BS ISO 6855-3:2012Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 3:
18、Fuel consumption measurement at a constant speed1 ScopeThis part of ISO 6855 specifies the methods of measurement for fuel consumption at a constant speed on the road and on the chassis dynamometer. It is applicable to mopeds as defined in ISO 3833 equipped with a spark ignition engine (four-stroke
19、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 referenced document (including a
20、ny amendments) applies.ISO 6855-1:2012, Measurement methods for gaseous exhaust emissions and fuel consumption Part 1: General test requirementsISO 7116, Road vehicles Measurement method for the maximum speed of mopedsISO 28981, Mopeds Methods for setting the running resistance on a chassis dynamome
21、ter3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1target test speedconstant speed at which the moped is testedINTERNATIONAL STANDARD ISO 6855-3:2012(E) ISO 2012 All rights reserved 1BS ISO 6855-3:2012ISO 6855-3:2012(E)4 SymbolsTable 1 SymbolsSy
22、mbols Definition UnitFc,aispecific fuel consumption of the first test km/LFc,bispecific fuel consumption of the second test km/LFc,iaverage specific fuel consumption of first and second tests km/LFc,jmean value of average specific fuel consumptions km/LLroadtest section length to measure the fuel co
23、nsumption kmpTtotal barometric pressure during the test kPap0total barometric pressure at the standard reference condition kPaTTair temperature during the test KrTrelative air density during the test r0relative air density at the standard reference conditions T0air temperature at the standard refere
24、nce conditions Ktc,aitime during the measurement of fuel consumption of the first test htc,bitime during the measurement of fuel consumption of the second test hVc,aimeasured volume of consumed fuel during the first test LVc,bimeasured volume of consumed fuel during the second test Lvc,aimoped speed
25、 during the first test km/hvc,bimoped speed during the second test km/hvc,iaverage moped speed of first and second tests km/hvc,jmean value of average moped speeds km/hvTtarget test speed km/h5 General requirements5.1 Measurement of fuel consumption of a moped based on the constant speed method shal
26、l 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 2 %, and which does not interfere with the supply of fuel to the engine. Where the measuring system is volumetric, the temp
27、erature 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.ISO 6855-1:2012, Annex A, gives the description and the methods of use of th
28、e 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 moped shall be stabilized at the normal temperature for the moped in use.5.6 The total test mass, including the masses of the
29、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 moped cannot be run stably; the gear used shall be reported in test results.2 ISO 2012 All rights reser
30、vedBS ISO 6855-3:2012ISO 6855-3:2012(E)6 Road measurement method6.1 Rider and riding position6.1.1 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
31、 kg 2 kg and be 1,75 m 0,02 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 moped during the test.The position of the rider should remain
32、 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 track6.2.1 The total length of test track shall be the sum of the following sections:a) the acceleration section to reach at the stabilized ta
33、rget test speed;b) the test section to measure the fuel consumption;c) the deceleration section to stop the test moped 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
34、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 s
35、hall not exceed 0,5 % between any two points at least 2 m apart.6.3 Ambient conditions for the road testDuring 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
36、during fuel consumption measurement 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 %;f
37、) air temperature: 278 K to 308 K. ISO 2012 All rights reserved 3BS ISO 6855-3:2012ISO 6855-3:2012(E)The relative air density during the test, rT, shall be calculated by Formula (1):rTT00T= rppTT0(1)The standard reference conditions are specified in ISO 6855-1:2012, Clause 5.The relative air density
38、 during the test shall not differ by more than 7,5 % from the standard relative air density in ISO 6855-1:2012, Clause 5.6.4 Measuring instruments on the test moped for the road testWhen installing the measuring instruments on the test moped, care shall be taken to minimize their effect on the distr
39、ibution of the load between the wheels. When installing the speed sensor outside the moped, care shall be taken to minimize the additional aerodynamic loss.6.5 Test method6.5.1 The speed of the test moped shall be maintained within 1 km/h of target test speed during the test. The fuel consumption me
40、asurement shall be started when any reference point of the test moped crosses the start line of the test section and be finished when the same reference point crosses the finish line of the test section.The time during the measurement of fuel consumption, tc,ai, (the period between start and end of
41、measuring the fuel consumption) shall be measured within the tolerance of 0,5 % and the moped speed during the test, vc,ai, shall be calculated from the time, tc,ai, and test section length Lroadas follows:vLtc,airoadc,ai= (2)The specific fuel consumption, Fc,ai, shall be calculated from the measure
42、d volume of consumed fuel, Vc,ai, and test section length Lroadas follows:FLVc,airoadc,ai= (3)6.5.2 The moped speed during the test, vc,ai, and the specific fuel consumption, Fc,ai, shall be recorded in the recording sheet specified in Annex B.6.5.3 The procedure described in 6.5.1 to 6.5.2 shall im
43、mediately be repeated in the opposite direction. The moped speed during the test, vc,bi, and the specific fuel consumption, Fc,bi, shall be obtained from the time during the measurement of fuel consumption, tc,bi, and the measured volume of consumed fuel, Vc,bi, as follows:vLtc,biroadc,bi= (4)FLVc,b
44、iroadc,bi= (5)The average moped speed, vc,i, and the average specific fuel consumption, Fc,i, shall be calculated by Formulae (6) and (7):vvvc,ic,ai c,bi2=+(6)FFFc,ic,ai c,bi2=+(7)4 ISO 2012 All rights reservedBS ISO 6855-3:2012ISO 6855-3:2012(E)6.5.4 At least three tests shall be performed and the
45、mean value of average moped speeds, vc,j, and the mean value of average specific fuel consumptions, Fc,j, shall be calculated by Formulae (8) and (9):vnvinc,jc,i=11(8)FnFinc,jc,i=11(9)6.5.5 If the mean value of average moped speeds, vc,j, is within 1,0 km/h of target test speed, vT, the tests are ac
46、ceptable and the mean value of average specific fuel consumptions shall be adopted as the results of the fuel consumption measurement.6.5.6 If the mean value of average moped speeds, vc,j, exceeds 1,0 km/h from the target test speed, vT, the extreme data set of the average moped speed, vc,i, and the
47、 average specific fuel consumption, Fc,i, shall be neglected and an additional test shall be carried out.The additional tests shall be performed until the mean value of average moped speeds, vc,j, is within 1,0 km/h of target test speed.If the test moped cannot be stably controlled at the test targe
48、t speed, the specific fuel consumption may be obtained by the determination method specified in Annex A.6.5.7 The mean value of average specific fuel consumptions, Fc,j, shall be rounded to one decimal place.7 Chassis dynamometer measurement methodThe chassis dynamometer shall be set in accordance w
49、ith ISO 28981.7.1 Test method7.1.1 The fuel consumption measurement by the carbon balance method7.1.1.1 The speed of the test moped shall not differ by more than 1,0 km/h from the target test speed during the test. The sampling, analysing and measuring the gaseous exhaust emissions shall be performed in accordance with ISO 6855-1.7.1.1.2 The specific fuel consumption shall be calculated in accordance with ISO 6855-1:2012, Clause 12.7.1.1.3 At least three tests shall be performed and the mean valu
