1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 6855-2:2012Mopeds Measurement method for gaseous exhaust emissions and fuel consumptionPart 2: Test cycles and specific test conditionsBS ISO 6855-2:2012 BRITISH STANDARDN
2、ational forewordThis British Standard is the UK implementation of ISO 6855-2:2012. Together with BS ISO 6855-1:2012 and BS ISO 6855-3:2012, it supersedes BS ISO 7859:2000, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e A U E / 1 4 , M
3、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 Standards I
4、nstitution 2012. Published by BSI Standards Limited 2012.ISBN 978 0 580 68464 7 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
5、2012.Amendments issued since publicationDate T e x t a f f e c t e d BS ISO 6855-2:2012 ISO 2012Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 2: Test cycles and specific test conditionsCyclomoteurs Mthode de mesure des missions de gaz polluants et de consommation
6、de combustible Partie 2: Cyclomoteurs dessai et conditions dessai spcifiquesINTERNATIONAL STANDARDISO6855-2First edition2012-09-15Reference numberISO 6855-2:2012(E)BS ISO 6855-2:2012ISO 6855-2:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless othe
7、rwise 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 requester.ISO copyright
8、 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 6855-2:2012ISO 6855-2:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Test cycle
9、. 13.1 Introduction 13.2 Type 1 test . 13.3 Type 2 test . 54 Presentation of results . 6Annex A (normative) Presentation of results for gaseous exhaust emissions 7Annex B (normative) Presentation of results of fuel consumption .11Bibliography .15BS ISO 6855-2:2012ISO 6855-2:2012(E)ForewordISO (the I
10、nternational 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
11、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 electrotechnica
12、l 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 bodie
13、s 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
14、 all such patent rights.ISO 6855-2 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 23, Mopeds.ISO 6855-2 cancels and replaces ISO 6855:1983 and ISO 7859:2000, both of which have been technically revised.ISO 6855 consists of the following parts, under the general title M
15、opeds 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 speediv ISO 2012 All rights reservedBS ISO 6855-2:2012ISO 6855-2:2012(E)IntroductionThis
16、part of ISO 6855 has been prepared to provide details of the typical test cycles for measurement of exhaust gas and fuel consumption. The measurements can be carried out by referring to this part of ISO 6855 and ISO 6855-1. ISO 2012 All rights reserved vBS ISO 6855-2:2012BS ISO 6855-2:2012Mopeds Mea
17、surement method for gaseous exhaust emissions and fuel consumption Part 2: Test cycles and specific test conditions1 ScopeThis part of ISO 6855 defines test cycles for measurement for gaseous exhaust emissions from mopeds, as well as for determining the fuel consumption of mopeds as defined in ISO 3
18、833, equipped with a spark 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, th
19、e latest edition of the referenced document (including any amendments) applies.ISO 4164, Mopeds Engine test code Net powerISO 6855-1:2012, Measurement methods for gaseous exhaust emissions and fuel consumption Part 1: General test requirementsISO 7116, Mopeds Measurement of maximum speed3 Test cycle
20、3.1 IntroductionThe test cycle is equivalent to the test cycle specified in the European Union Commission Directive 97/24/EC 5.The moped shall be placed on a chassis dynamometer equipped with a brake and flywheel. The test shall be conducted over four elementary urban cycles lasting a total of 448 s
21、 without interruption. Immediately before starting the first test cycle, the moped shall undergo four consecutive test cycles, each lasting 112 s, in order to warm up the engine.During the test the exhaust gases shall be diluted with air so that the flow volume of the mixture remains constant. Throu
22、ghout the test, a continuous flow of samples of the mixture shall be passed into one or more bags so that concentrations (average test values) of carbon monoxide, unburnt hydrocarbons, oxides of nitrogen and carbon dioxide can be determined.3.2 Type 1 test3.2.1 Operating cycle on the chassis dynamom
23、eter3.2.1.1 Description of cycleThe operating cycles on the chassis dynamometer are indicated in 3.2.4.INTERNATIONAL STANDARD ISO 6855-2:2012(E) ISO 2012 All rights reserved 1BS ISO 6855-2:2012ISO 6855-2:2012(E)3.2.1.2 General conditions for carrying out the cyclePreliminary test cycles shall be car
24、ried out if necessary to determine how best to actuate the accelerator and brake controls so as to achieve a cycle approximating to the theoretical cycle within the prescribed limits.3.2.1.3 Use of the gearboxThe gearbox shall be used in accordance with the manufacturers instructions. If there are n
25、o manufacturers instructions, the following rules apply.3.2.1.3.1 Manual gearboxAt a steady speed of 20 km/h, the engine speed shall as far as possible remain between 50 % and 90 % of the maximum speed. If this speed can be achieved using more than one gear, the engine is tested using the highest ge
26、ar.During acceleration, the engine shall be tested using the gear which allows maximum acceleration. The next higher gear shall be engaged, at the latest, when the engine speed has reached 110 % of the speed at which the maximum net power output occurs. During deceleration, the next lower gear shall
27、 be engaged before the engine begins to vibrate and, at the latest, when the engine speed has fallen to 30 % of the speed of the maximum net power. The first gear shall not be engaged during deceleration.3.2.1.3.2 Automatic gearbox and torque converterThe drive setting shall be used.3.2.1.4 Toleranc
28、es3.2.1.4.1 The theoretical speed shall be maintained to a tolerance of 1 km/h during all phases. Speed tolerances greater than those prescribed are permitted during phase changes provided that the tolerances are never exceeded for more than 0,5 s on any one occasion, in all cases subject to the pro
29、visions of 3.2.2.5.2 and 3.2.2.6.3.3.2.1.4.2 A tolerance of 0,5 s above or below the theoretical times shall be allowed.3.2.1.4.3 The speed and time tolerances are combined as indicated in 3.2.4.3.2.1.4.4 The distance travelled during the cycle shall be measured within an accuracy of 10 m.3.2.2 Proc
30、edure for chassis dynamometer tests3.2.2.1 Special conditions for carrying out the cycle3.2.2.1.1 The temperature in the premises where the chassis dynamometer bench is situated shall be between 293 K and 303 K throughout the test, and shall be as close as possible to the temperature of the premises
31、 where the mopeds were conditioned.3.2.2.1.2 The moped shall as far as possible be horizontal during the test so as to avoid any abnormal distribution of the fuel.3.2.2.1.3 During the test, the moped speed shall be plotted against time in order to check that the cycles have been performed correctly.
32、3.2.2.1.4 The temperatures of the cooling water and the crankcase oil may be recorded.2 ISO 2012 All rights reservedBS ISO 6855-2:2012ISO 6855-2:2012(E)3.2.2.2 Starting up the engine3.2.2.2.1 Once the preliminary operations on the equipment for collecting, diluting, analysing and measuring the gases
33、 have been carried out, the engine is started up by means of the devices provided for that purpose, such as the choke, the starter valve, etc., according to the manufacturers instructions.3.2.2.2.2 The first cycle begins when the taking of samples and the measuring of the pump rotations commence.3.2
34、.2.3 Use of the manual chokeThe choke shall be cut out as soon as possible and in principle before acceleration from 0 to 50 km/h. If this requirement cannot be met, the moment of actual cut-out shall be indicated. The choke shall be adjusted in accordance with the manufacturers instructions.3.2.2.4
35、 Idling3.2.2.4.1 Manual-shift gearbox3.2.2.4.1.1 During periods of idling the clutch shall be engaged and the gears in neutral.3.2.2.4.1.2 To enable the accelerations to be performed according to the normal cycle, the vehicle shall be put in first gear, with the clutch disengaged, 5 s before commenc
36、ement of the acceleration following the idling period in question.3.2.2.4.1.3 The first idling period at the beginning of the cycle consists of 6 s of idling in neutral with the clutch engaged and 5 s in first gear with the clutch disengaged.3.2.2.4.1.4 For the idling periods during each cycle, the
37、corresponding times are 16 s in neutral and 5 s in first gear with the clutch disengaged.3.2.2.4.1.5 The last idling period in the cycle consists of 7 s in neutral with the clutch engaged.3.2.2.4.2 Semi-automatic gearboxesThe manufacturers instructions for driving in town or, in their absence, instr
38、uctions applicable to manual gearboxes, shall be followed.3.2.2.4.3 Automatic gearboxesThe selector shall not be operated at any time during the test unless the manufacturer specifies otherwise. In the latter case, the procedure for manual gearboxes applies.3.2.2.5 Accelerations3.2.2.5.1 Acceleratio
39、ns shall be effected so as to ensure that the rate of acceleration is as constant as possible throughout the operation.3.2.2.5.2 If the acceleration capacities of the moped are not sufficient to perform the acceleration cycles within the prescribed tolerances, the moped shall be driven with the thro
40、ttle completely open until the speed prescribed for the cycle has been reached. The cycle may then continue normally. ISO 2012 All rights reserved 3BS ISO 6855-2:2012ISO 6855-2:2012(E)3.2.2.6 Decelerations3.2.2.6.1 All decelerations shall be effected by completely closing the throttle, the clutch re
41、maining engaged. The engine shall be disengaged at a speed of 10 km/h3.2.2.6.2 If the period of deceleration is longer than that prescribed for the corresponding phase, the vehicles brakes are used to keep to the cycle.3.2.2.6.3 If the period of deceleration is shorter than that prescribed for the c
42、orresponding phase, the timing of the theoretical cycle is restored by a steady-state or an idling period merging into the following steady-state or idling operation. In this case, 3.2.1.4.3 is not applicable.3.2.2.6.4 At the end of the deceleration period (stopping moped on the rollers), the gear s
43、hall be put into neutral and the clutch engaged.3.2.2.7 Constant speeds3.2.2.7.1 “Pumping” or the closing of the throttle shall be avoided when passing from acceleration to the following steady speed.3.2.2.7.2 Periods of constant speed shall be achieved by keeping the accelerator position fixed.3.2.
44、3 AnalysisThe exhaust gases contained in the bag shall be analysed as soon as possible and in any event not later than 20 min after the end of the test cycle.3.2.4 Operating cycleThe operating cycle on the dynamometer is as indicated in Table 1 and plotted in Figure 1.Table 1 Operating cycle on the
45、dynamometerPhase Operation Acceleration m/s2Speed Km/hDuration secCumulative time sec1 Idling 0 8 82 Acceleration Full throttle 0 to max57 a3 Steady speed Full throttle max 4 Deceleration - 0,56 max to 20 655 Steady speed 20 36 1016 Deceleration - 0,93 20 to 0 6 1077 Idling 0 5 112aTotal duration of
46、 phases 2 to 4.4 ISO 2012 All rights reservedBS ISO 6855-2:2012ISO 6855-2:2012(E)KeyX time, sY speed, km/hA warming upB samplingFigure 1 Operating cycle on chassis dynamometer3.3 Type 2 test3.3.1 Measurement conditionsThe mass of carbon monoxide and the mass of unburnt hydrocarbons emitted with the
47、engine at idling speed shall be measured for one minute.In the case of mopeds with manual transmission gearboxes, the test shall be carried out with the gear lever in the neutral position and with the clutch engaged.In the case of mopeds with automatic transmission gearboxes, the test shall be carri
48、ed out with the clutch engaged and with the driving wheel immobile.The idling speed of the engine during the idling period shall be adjusted in accordance with the manufacturers instructions.3.3.2 Sampling of gasesThe electromagnetic valves shall be set in the position for direct analysis of the dil
49、uted exhaust gases and the dilution air.The analyser shall show a steady value within one minute after being connected up to the probe.The concentrations of HC and CO in the samples of diluted exhaust gases and in the dilution air are determined from the values shown or recorded by the measuring equipment by applying the correct calibration curves. ISO 2012 All rights reserved 5BS ISO 6855-2:2012ISO 6855-2:2012(E)The value adopted as the content of the gaseous pollutants in the gases analysed
