1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 6855-3:2012 Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 3: Fuel consumption measurement at a constant speedBS ISO 6855-3:2012 BRIT
2、ISH STANDARD National foreword This 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 Together with BS ISO 6855-1:2012 and BS ISO 6855-2:2012, it supersedes BS ISO 7859:2000, which is withdrawn.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
3、A U E / 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 B
4、ritish Standards 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 Comm
5、ittee on 31 October 2012. Amendments issued since publication Date T e x t a f f e c t e dBS ISO 6855-3:2012 ISO 2012 Mopeds Measurement method for gaseous exhaust emissions and fuel consumption Part 3: Fuel consumption measurement at a constant speed Cyclomoteurs Mthode de mesure des missions de ga
6、z polluants et de consommation de combustible Partie 3: Mesure de consommation de combustible vitesse constante INTERNATIONAL STANDARD ISO 6855-3 First edition 2012-09-15 Reference number ISO 6855-3:2012(E)BS ISO 6855-3:2012ISO 6855-3:2012(E) ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUM
7、ENT ISO 2012 All rights 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
8、in the country of the 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 6855-3:2012ISO 6855-3:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword iv Introdu
9、ction v 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Symbols 2 5 General requirements . 2 6 Road measurement method . 3 6.1 Rider and riding position . 3 6.2 Test track 3 6.3 Ambient conditions for the road test . 3 6.4 Measuring instruments on the test moped for the road test
10、 4 6.5 Test method . 4 7 Chassis dynamometer measurement method . 5 7.1 Test method . 5 8 Presentation of results . 6 Annex A (normative) Determination method of fuel consumption . 7 Annex B (normative) Presentation of results of fuel consumption 9 Bibliography .15BS ISO 6855-3:2012ISO 6855-3:2012(E
11、) 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 interested in a subject for which a
12、 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 all matte
13、rs 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 circula
14、ted 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 responsibl
15、e for identifying any or all such patent rights. ISO 6855-3 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 t
16、he 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 reservedBS ISO 6855-3:2012ISO 6855-3:2012(
17、E) Introduction This part of ISO 6855 defines specific requirements 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 m
18、ethod for gaseous exhaust emissions and fuel consumption Part 3: Fuel consumption measurement at a constant speed 1 Scope This 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 defi
19、ned 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 references, only the edition cited applies. For undated r
20、eferences, the latest edition of the referenced document (including any amendments) applies. ISO 6855-1:2012, Measurement methods for gaseous exhaust emissions and fuel consumption Part 1: General test requirements ISO 7116, Road vehicles Measurement method for the maximum speed of mopeds ISO 28981,
21、 Mopeds Methods for setting the running resistance on a chassis dynamometer 3 T erms a nd definiti ons For the purposes of this document, the following terms and definitions apply. 3.1 target test speed constant speed at which the moped is tested INTERNATIONAL ST ANDARD ISO 6855-3:2012(E) ISO 2012 A
22、ll rights reserved 1BS ISO 6855-3:2012ISO 6855-3:2012(E) 4 Symbols Table 1 Symbols Symbols D e f i n i t ion Unit F c,ai specific fuel consumption of the first test km/L F c,bi specific fuel consumption of the second test km/L F c,i average specific fuel consumption of first and second tests km/L F
23、c,j mean value of average specific fuel consumptions km/L L road test section length to measure the fuel consumption km p T total barometric pressure during the test kPa p 0 total barometric pressure at the standard reference condition kPa T T air temperature during the test K r T relative air densi
24、ty during the test r 0 relative air density at the standard reference conditions T 0 air temperature at the standard reference conditions K t c,ai time during the measurement of fuel consumption of the first test h t c,bi time during the measurement of fuel consumption of the second test h V c,ai me
25、asured volume of consumed fuel during the first test L V c,bi measured volume of consumed fuel during the second test L v c,ai moped speed during the first test km/h v c,bi moped speed during the second test km/h v c,i average moped speed of first and second tests km/h v c,j mean value of average mo
26、ped speeds km/h v T target test speed km/h 5 General requirements 5.1 Measurement of fuel consumption of a moped based on the constant speed method shall 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
27、 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 temperature 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
28、 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 the appropriate devices. The carbon balance method can also be applied for the measurement of fuel consumption on the chassis dynamometer. 5.5 Befo
29、re 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 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 highe
30、st 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 reservedBS ISO 6855-3:2012ISO 6855-3:2012(E) 6 Road measurement method 6.1 Rider and riding position 6.1.1 The rider shall wear a close-fitting su
31、it (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 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
32、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 unchanged during the whole measurement; the description of the position shall be indicated in the test report or shall be replaced by
33、photograph(s). 6.2 Test track 6.2.1 The total length of test track shall be the sum of the following sections: a) the acceleration section to reach at the stabilized target test speed; b) the test section to measure the fuel consumption; c) the deceleration section to stop the test moped safely. 6.2
34、.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 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 cove
35、red 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 shall not exceed 0,5 % between any two points at least 2 m apart. 6.3 Ambient conditions for the road test During data collecting
36、 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 during fuel consumption measurement is representative. The ambient conditions shall be within the following limits: a) maximum
37、 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) air temperature: 278 K to 308 K. ISO 2012 All rights reserved 3BS ISO 6855-3:2012ISO 6855-3:2012(E) The relative air
38、density during the test, r T , shall be calculated by Formula (1): (1) The standard reference conditions are specified in ISO 6855-1:2012, Clause 5. The relative air density 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 M
39、easuring instruments on the test moped for the road test When installing the measuring instruments on the test moped, care shall be taken to minimize their effect on the distribution of the load between the wheels. When installing the speed sensor outside the moped, care shall be taken to minimize t
40、he additional aerodynamic loss. 6.5 Test method 6.5.1 The speed of the test moped shall be maintained within 1 km/h of target test speed during the test. The fuel consumption measurement shall be started when any reference point of the test moped crosses the start line of the test section and be fin
41、ished when the same reference point crosses the finish line of the test section. The time during the measurement of fuel consumption, t c,ai , (the period between start and end of measuring the fuel consumption) shall be measured within the tolerance of 0,5 % and the moped speed during the test, v c
42、,ai , shall be calculated from the time, t c,ai , and test section length L roadas follows: (2) The specific fuel consumption, F c,ai , shall be calculated from the measured volume of consumed fuel, V c,ai , and test section length L roadas follows: (3) 6.5.2 The moped speed during the test, v c,ai
43、, and the specific fuel consumption, F c,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 immediately be repeated in the opposite direction. The moped speed during the test, v c,bi , and the specific fuel consumption, F c,bi ,
44、shall be obtained from the time during the measurement of fuel consumption, t c,bi , and the measured volume of consumed fuel, V c,bi , as follows: (4) (5) The average moped speed, v c,i , and the average specific fuel consumption, F c,i , shall be calculated by Formulae (6) and (7): v vv (6) F FF (
45、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 mean value of average moped speeds, v c,j , and the mean value of average specific fuel consumptions, F c,j , shall be calculated by Formulae (8) and (9): (8) (9) 6.5.5 If the
46、mean value of average moped speeds, v c,j , is within 1,0 km/h of target test speed, v T , the tests are acceptable 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, v c,j , e
47、xceeds 1,0 km/h from the target test speed, v T , the extreme data set of the average moped speed, v c,i , and the average specific fuel consumption, F c,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
48、speeds, v c,j , is within 1,0 km/h of target test speed. If the test moped cannot be stably controlled at the test target 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, F c,j , shall be rounded to one decimal place. 7 Chassis dynamometer measurement method The chassis dynamometer shall be set in accordance with ISO 28981. 7.1 Test method 7.1.1 The fuel consumption measurement by the carbon balance method 7.1.1.1 The speed of the test moped shall not differ by more t
