1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 4164:2012Mopeds Engine test code Net powerBS ISO 4164:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 4164:2012. The UK partici
2、pation in its preparation was entrusted to T e c h n i c a l Committee AUE/14, Motor cycles and mopeds.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
3、responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012.ISBN 978 0 580 71423 8 ICS 43.140 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the S
4、tandards Policy and Strategy Committee on 31 October 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 4164:2012 ISO 2012Mopeds Engine test code Net powerCyclomoteurs Code dessai des moteurs Puissance netteINTERNATIONAL STANDARDISO4164Second edition2012-09-15Reference number
5、ISO 4164:2012(E)BS ISO 4164:2012ISO 4164:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All 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
6、 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 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
7、4164:2012ISO 4164:2012(E) ISO 2012 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols 25 Standard reference conditions 26 Tests . 36.1 General . 36.2 Measuring equipment and instrument accuracy 36.3 Setting and test conditions . 36.
8、4 Test procedure 107 Torque, power and specific fuel consumption 107.1 Calculation of measured torque, measured power and specific fuel consumption 107.2 Net torque and net power 117.3 Corrected net torque and corrected net power .128 Test report 138.1 General 138.2 The description of test report .
9、138.3 Statement of results . 16Bibliography .19BS ISO 4164:2012ISO 4164:2012(E)ForewordISO (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 IS
10、O 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 part in the work. ISO collaborates c
11、losely 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 to prepare International Standards. Dra
12、ft 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 that some of the elements of this docum
13、ent may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 4164 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 23, Mopeds.This second edition cancels and replaces the first edition (ISO 4164:1978), which
14、 has been technically revised.iv ISO 2012 All rights reservedBS ISO 4164:2012INTERNATIONAL STANDARD ISO 4164:2012(E)Mopeds Engine test code Net power1 ScopeThis International Standard specifies methods for evaluating the performance of engines designed for mopeds as defined in ISO 3833, in particula
15、r with a view to the presentation of power curves and specific fuel consumption at full load as a function of engine speed, for net power assessment. It is applicable to reciprocating internal combustion engines (spark-ignition), excluding free-piston engines, and rotary piston engines, either natur
16、ally aspirated or pressure-charged and equipped with either mechanical pressure-charger or turbocharger.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 l
17、atest edition of the referenced document (including any amendments) applies.ISO 2710-1, Reciprocating internal combustion engines Vocabulary Part 1: Terms for engine design and operationISO 3833, Road vehicles Types Terms and definitionsISO 15550, Internal combustion engines Determination and method
18、 for the measurement of engine power General requirements3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 2710-1, ISO 15550 and the following apply.3.1net powerpower obtained on a test bed at the end of the crankshaft or its equivalent at the correspon
19、ding engine speed with the equipment and auxiliaries listed in 6.3.13.2corrected net powernet power corrected under the standard reference conditions3.3net torquetorque transmitted on a test bed at the end of the crankshaft or its equivalent at the corresponding engine speed with the equipment and a
20、uxiliaries listed in 6.3.13.4corrected net torquenet torque corrected under the standard reference conditions3.5specific fuel consumptionamount of fuel consumed by an engine per unit of power and timeNOTE The amount of the lubricants for two-stoke cycle engines is excluded. ISO 2012 All rights reser
21、ved 1BS ISO 4164:2012ISO 4164:2012(E)3.6auxiliariesequipment and devices necessary to make the engine acceptable for service in the intended application.4 SymbolsThe symbols used in this International Standard are given in Table 1.Table 1 SymbolsSymbols Designation UnitbeSpecific fuel consumption g/
22、(kWh)pdAmbient dry air barometric pressure during the test kPaprStandard reference total barometric pressure kPapsrStandard reference saturated water vapour pressure kPapsyAmbient saturated water vapour pressure during the test kPapyAmbient total barometric pressure during the test kPaP Measured pow
23、er kWPoCorrected net power kWPyNet power kWT Measured torque NmToCorrected net torque NmTyNet torque NmtrStandard reference ambient air temperature KtyEngine inlet air temperature during the test KaCorrection factor for ambient test conditions -mCorrection factor for efficiency of the transmission -
24、iEfficiency of each element constituting the transmission -tEfficiency of the transmission which is located between the crankshaft and the measurement point-rStandard reference relative humidity %yAmbient relative humidity during the test %5 Standard reference conditionsFor the purpose of determinin
25、g the power and fuel consumption of an engine, the following standard reference conditions shall be used: Standard reference total barometric pressure: pr = 100 kPa; Standard reference air temperature: tr = 298 K; Standard reference relative humidity: r = 30 %;NOTE A relative humidity of 30 % at a t
26、emperature of 298 K corresponds to a water pressure of 1 kPa. The corresponding dry barometric pressure is 99 kPa.2 ISO 2012 All rights reservedBS ISO 4164:2012ISO 4164:2012(E)6 Tests6.1 GeneralThis test method is used for verifying the net power of an engine type with the declared values. It presen
27、ts engine performance at full power/torque as a function of engine speed by generating curves of corrected net torque, corrected net power and specific fuel consumption.6.2 Measuring equipment and instrument accuracy6.2.1 TorqueThe dynamometer torque-measuring system shall have an accuracy of 1 % in
28、 the range of scale values required for the test. The torque-measuring system shall be calibrated to take into account friction losses. The accuracy may be 2 % for measurements carried out at a power less than 50 % of maximum power.6.2.2 Engine speedThe engine speed measuring system shall have an ac
29、curacy of 0,5 %.6.2.3 Fuel flowThe fuel flow measuring system shall have an accuracy of 2 %.6.2.4 Fuel temperatureThe fuel temperature measuring system shall have an accuracy of 1 K.6.2.5 Engine inlet air temperatureThe air temperature measuring system shall have an accuracy of 1 K.6.2.6 Barometric
30、pressureThe barometric pressure measuring system shall have an accuracy of 70 Pa.6.2.7 Back pressure in exhaust systemThe system used to measure the back pressure (differential pressure) in the exhaust system shall have an accuracy of 25 Pa.6.2.8 Test-room humidityThe test-room-humidity measuring sy
31、stem shall have an accuracy of 5 % in relative humidity.NOTE In the specified test atmospheric conditions in 6.3.3, the worst relative humidity measurement accuracy of 5 % corresponds to a wet and dry bulb thermometer measurement accuracy of 0,5 K. In the worst case, it is estimated that accuracy of
32、 0,5 K in a wet and dry bulb thermometer measurement would give the influence of approximately 0,3 % on the net power measuring result.6.3 Setting and test conditions6.3.1 Equipment and auxiliariesDuring the test, if the equipment and auxiliaries specified in Table 2 are the standard productions, th
33、ey shall be installed on the test bench as far as possible in the same position and as the same condition as in the intended application. ISO 2012 All rights reserved 3BS ISO 4164:2012ISO 4164:2012(E)Table 2 Equipment and auxiliaries to be installed for the test to determine engine powerNo. Equipmen
34、t and auxiliaries1 Inlet system:Inlet manifoldCrankcase emission control systemControl devices for dual inductionElectronic control systemAir flow meterAir inlet ductwork Except in the case where there is a risk of the system having a noticeable influence upon engine power, where the equivalents may
35、 be used. In this case, a check shall be made to ascer-tain that inlet depression does not differ by more than 100 Pa from the limit specified by the manufacturer for a clean air filter.Air filter Except in the case where there is a risk of the system having a noticeable influence upon engine power,
36、 where the equivalents may be used. In this case, a check shall be made to ascer-tain that inlet depression does not differ by more than 100 Pa from the limit specified by the manufacturer for a clean air filter.Inlet silencer Except in the case where there is a risk of the system having a noticeabl
37、e influence upon engine power, where the equivalents may be used. In this case, a check shall be made to ascer-tain that inlet depression does not differ by more than 100 Pa from the limit specified by the manufacturer for a clean air filter.Speed-limiting device Except in the case where there is a
38、risk of the system having a noticeable influence upon engine power, where the equivalents may be used. In this case, a check shall be made to ascer-tain that inlet depression does not differ by more than 100 Pa from the limit specified by the manufacturer for a clean air filter.2 Induction-heating d
39、evice of inlet manifold4 ISO 2012 All rights reservedBS ISO 4164:2012ISO 4164:2012(E)No. Equipment and auxiliaries3 Exhaust system:Exhaust purifierExhaust manifoldPressure-charging deviceConnecting pipes If it is impracticable to fit the standard exhaust system, a system permitting the normal engine
40、 running characteristics in accordance with the manufacturers specification shall be fitted for the test. In particular, in the test laboratory, the exhaust extraction system at the point where the test bench exhaust system is connected shall not create a pressure differing from the atmospheric pres
41、sure by more than 740 Pa at the exhaust extraction duct, with the engine in operation, unless the manufacturer has specifically prescribed the back pressure prior to the test, in which case the lower of the two pressures shall be used.Silencer If it is impracticable to fit the standard exhaust syste
42、m, a system permitting the normal engine running characteristics in accordance with the manufacturers specification shall be fitted for the test. In particular, in the test laboratory, the exhaust extraction system at the point where the test bench exhaust system is connected shall not create a pres
43、sure differing from the atmospheric pressure by more than 740 Pa at the exhaust extraction duct, with the engine in operation, unless the manufacturer has specifically prescribed the back pressure prior to the test, in which case the lower of the two pressures shall be used.Tail pipe If it is imprac
44、ticable to fit the standard exhaust system, a system permitting the normal engine running characteristics in accordance with the manufacturers specification shall be fitted for the test. In particular, in the test laboratory, the exhaust extraction system at the point where the test bench exhaust sy
45、stem is connected shall not create a pressure differing from the atmospheric pressure by more than 740 Pa at the exhaust extraction duct, with the engine in operation, unless the manufacturer has specifically prescribed the back pressure prior to the test, in which case the lower of the two pressure
46、s shall be used.Electronic control system4 Fuel supply systemFuel supply pump If necessary, the fuel feed pressure may be adjusted to reproduce the fuel pressures existing in the particular engine application (particularly when a “fuel return” system, for example to tank or filter, is used).Carburet
47、torElectronic control systemGaseous fuel pressure reducerGaseous fuel evaporatorGaseous fuel mixerTable 2 (continued) ISO 2012 All rights reserved 5BS ISO 4164:2012ISO 4164:2012(E)No. Equipment and auxiliaries5 Fuel injection equipmentPrefilterFilterFuel injection pumpHigh-pressure pipesInjectorAir
48、inlet valveElectronic control system6 Liquid-cooling equipmentRadiatorFanFan cowlWater pumpThermostatThe radiator, fan, fan cowl, water pump, thermostat and cowl shall be located on the test bed in the same relative positions that they are to occupy on the vehicle or machine. The cooling liquid circ
49、ulation shall only be operated by the engine water pump. Cooling of the liquid may be provided either by the engine radiator or by an external circuit, provided that the pressure loss of this circuit and the pressure at the pump inlet remains sub-stantially the same as those of the engine cooling system. The radiator shutter, if incorporated, shall be set in the open position. Where the fan, radiator and cowl system cannot conveniently be fitted to the engine, the power absorbed b
