1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 6855-2:2012 Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 2: Test cycles and specific test conditionsBS ISO 6855-2:2012 BRITISH STAN
2、DARD National foreword This 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 Together with BS ISO 6855-1:2012 and BS ISO 6855-3:2012, it supersedes BS ISO 7859:2000, which is withdrawn.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 /
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 S
4、tandards Institution 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
5、 31 October 2012. Amendments issued since publication Date T e x t a f f e c t e d BS ISO 6855-2:2012 ISO 2012 Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 2: Test cycles and specific test conditions Cyclomoteurs Mthode de mesure des missions de gaz polluants et
6、de consommation de combustible Partie 2: Cyclomoteurs dessai et conditions dessai spcifiques INTERNATIONAL STANDARD ISO 6855-2 First edition 2012-09-15 Reference number ISO 6855-2:2012(E)BS ISO 6855-2:2012ISO 6855-2:2012(E) ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 All ri
7、ghts reserved. 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 t
8、he requester. ISO copyright office Case postale 56 CH-1211 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 6855-2:2012ISO 6855-2:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1
9、 2 Normative references 1 3 Test cycle . 1 3.1 Introduction 1 3.2 Type 1 test . 1 3.3 Type 2 test . 5 4 Presentation of results . 6 Annex A (normative) Presentation of results for gaseous exhaust emissions 7 Annex B (normative) Presentation of results of fuel consumption .11 Bibliography .15BS ISO 6
10、855-2:2012ISO 6855-2:2012(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interest
11、ed 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 part in the work. ISO collaborates closely with the International Electrotechnical Co
12、mmission (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 to prepare International Standards. Draft International Standards adopted by the techn
13、ical 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 that some of the elements of this document may be the subject of patent rights. ISO s
14、hall not be held responsible for identifying any or 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 cons
15、ists 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 Part 3: Fuel consumption measurement at a constant speed iv ISO 2012 All rights reserv
16、edBS ISO 6855-2:2012ISO 6855-2:2012(E) Introduction This 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
17、 reserved vBS ISO 6855-2:2012BS ISO 6855-2:2012Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 2: Test cycles and specific test conditions 1 Scope This part of ISO 6855 defines test cycles for measurement for gaseous exhaust emissions from mopeds, as well as for det
18、ermining the fuel consumption of mopeds as defined in ISO 3833, 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 this document. For dated reference
19、s, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 4164, Mopeds Engine test code Net power ISO 6855-1:2012, Measurement methods for gaseous exhaust emissions and fuel consumption Part 1: General test requir
20、ements ISO 7116, Mopeds Measurement of maximum speed 3 Test cycle 3.1 Introduction The 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 b
21、e conducted over four elementary urban cycles lasting a total of 448 s 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
22、with air so that the flow volume of the mixture remains constant. Throughout 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
23、 determined. 3.2 Type 1 test 3.2.1 Operating cycle on the chassis dynamometer 3.2.1.1 Description of cycle The operating cycles on the chassis dynamometer are indicated in 3.2.4. INTERNATIONAL ST ANDARD ISO 6855-2:2012(E) ISO 2012 All rights reserved 1BS ISO 6855-2:2012ISO 6855-2:2012(E) 3.2.1.2 Gen
24、eral conditions for carrying out the cycle Preliminary test cycles shall be carried 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 gearbox The gearbo
25、x shall be used in accordance with the manufacturers instructions. If there are no manufacturers instructions, the following rules apply. 3.2.1.3.1 Manual gearbox At 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
26、can be achieved using more than one gear, the engine is tested using the highest gear. 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
27、 the maximum net power output occurs. During deceleration, the next lower gear shall 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 A
28、utomatic gearbox and torque converter The drive setting shall be used. 3.2.1.4 Tolerances 3.2.1.4.1 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
29、 never exceeded for more than 0,5 s on any one occasion, in all cases subject to the provisions 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
30、distance travelled during the cycle shall be measured within an accuracy of 10 m. 3.2.2 Procedure for chassis dynamometer tests 3.2.2.1 Special conditions for carrying out the cycle 3.2.2.1.1 The temperature in the premises where the chassis dynamometer bench is situated shall be between 293 K and 3
31、03 K throughout the test, and shall be as close as possible to the temperature of the premises 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 spee
32、d shall be plotted against time in order to check that the cycles have been performed correctly. 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 engine 3.2.2.2.1 Once the
33、 preliminary operations on the equipment for collecting, diluting, analysing and measuring the gases 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 T
34、he first cycle begins when the taking of samples and the measuring of the pump rotations commence. 3.2.2.3 Use of the manual choke The 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 sh
35、all be indicated. The choke shall be adjusted in accordance with the manufacturers instructions. 3.2.2.4 Idling 3.2.2.4.1 Manual-shift gearbox 3.2.2.4.1.1 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
36、to the normal cycle, the vehicle shall be put in first gear, with the clutch disengaged, 5 s before commencement 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
37、 and 5 s in first gear with the clutch disengaged. 3.2.2.4.1.4 For the idling periods during each cycle, the 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
38、.2.2.4.2 Semi-automatic gearboxes The manufacturers instructions for driving in town or, in their absence, instructions applicable to manual gearboxes, shall be followed. 3.2.2.4.3 Automatic gearboxes The selector shall not be operated at any time during the test unless the manufacturer specifies ot
39、herwise. In the latter case, the procedure for manual gearboxes applies. 3.2.2.5 Accelerations 3.2.2.5.1 Accelerations 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 su
40、fficient to perform the acceleration cycles within the prescribed tolerances, the moped shall be driven with the throttle 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
41、) 3.2.2.6 Decelerations 3.2.2.6.1 All decelerations shall be effected by completely closing the throttle, the clutch remaining engaged. The engine shall be disengaged at a speed of 10 km/h 3.2.2.6.2 If the period of deceleration is longer than that prescribed for the corresponding phase, the vehicle
42、s 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 corresponding 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
43、, 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 shall be put into neutral and the clutch engaged. 3.2.2.7 Constant speeds 3.2.2.7.1 “Pumping” or the closing of the throttle shall be avoided when passing from acceleration to the
44、 following steady speed. 3.2.2.7.2 Periods of constant speed shall be achieved by keeping the accelerator position fixed. 3.2.3 Analysis The 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 Operatin
45、g cycle The operating cycle on the dynamometer is as indicated in Table 1 and plotted in Figure 1. Table 1 Operating cycle on the dynamometer Phase Operation Acceleration m/s 2 Speed Km/h Duration sec Cumulative time sec 1 Idling 0 8 8 2 Acceleration Full throttle 0 to max 57 a 3 Steady speed Full t
46、hrottle max 4 Deceleration - 0,56 max to 20 65 5 Steady speed 20 36 101 6 Deceleration - 0,93 20 to 0 6 107 7 Idling 0 5 112 aTotal duration of phases 2 to 4. 4 ISO 2012 All rights reservedBS ISO 6855-2:2012ISO 6855-2:2012(E) Key X time, s Y speed, km/h A warming up B sampling Figure 1 Operating cyc
47、le on chassis dynamometer 3.3 Type 2 test 3.3.1 Measurement conditions The mass of carbon monoxide and the mass of unburnt hydrocarbons emitted with the 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 wi
48、th 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 carried 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
49、accordance with the manufacturers instructions. 3.3.2 Sampling of gases The electromagnetic valves shall be set in the position for direct analysis of the diluted 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 correc
