1、BSI Standards PublicationBS ISO 15500-7:2015Road vehicles Compressednatural gas (CNG) fuel systemcomponentsPart 7: Gas injectorBS ISO 15500-7:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 15500-7:2015.The UK participation in its preparation was entrusted
2、 to TechnicalCommittee GSE/40, Gas supply equipment for natural gas vehicles.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correcta
3、pplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 79966 2ICS 43.060.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Com
4、mittee on 31 December 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 15500-7:2015 ISO 2015Road vehicles Compressed natural gas (CNG) fuel system components Part 7: Gas injectorVhicules routiers Composants des systmes de combustible gaz naturel comprim (GNC) Par
5、tie 7: Injecteur de gazINTERNATIONAL STANDARDISO15500-7Second edition2015-12-01Reference numberISO 15500-7:2015(E)BS ISO 15500-7:2015ISO 15500-7:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no pa
6、rt of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member b
7、ody in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 15500-7:2015ISO 15500-7:2015(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 24 M
8、arking 25 Construction and assembly . 26 Tests . 36.1 Applicability 36.2 Pneumatic strength . 36.3 Continued operation 36.3.1 Bench durability . 36.3.2 Temperature 46.4 Insulation resistance 5Bibliography 6 ISO 2015 All rights reserved iiiContents PageBS ISO 15500-7:2015ISO 15500-7:2015(E)ForewordIS
9、O (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 technical co
10、mmittee 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 electro
11、technical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was draf
12、ted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).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 rig
13、hts. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constit
14、ute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe commi
15、ttee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 41, Specific aspects for gaseous fuels.This second edition cancels and replaces the first edition (ISO 15500-7:2002), which has been technically revised.ISO 15500 consists of the following parts, under the general title
16、Road vehicles Compressed natural gas (CNG) fuel system components: Part 1: General requirements and definitions Part 2: Performance and general test methods Part 3: Check valve Part 4: Manual valve Part 5: Manual cylinder valve Part 6: Automatic valve Part 7: Gas injector Part 8: Pressure indicator
17、Part 9: Pressure regulator Part 10: Gas-flow adjuster Part 11: Gas/air mixer Part 12: Pressure relief valve (PRV) Part 13: Pressure relief device (PRD)iv ISO 2015 All rights reservedBS ISO 15500-7:2015ISO 15500-7:2015(E) Part 14: Excess flow valve Part 15: Gas-tight housing and ventilation hose Part
18、 16: Rigid fuel line in stainless steel Part 17: Flexible fuel line Part 18: Filter Part 19: Fittings Part 20: Rigid fuel line in material other than stainless steel ISO 2015 All rights reserved vBS ISO 15500-7:2015BS ISO 15500-7:2015Road vehicles Compressed natural gas (CNG) fuel system components
19、Part 7: Gas injector1 ScopeThis part of ISO 15500 specifies tests and requirements for the gas injector and/or fuel rail, a compressed natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833.This part of ISO 15500 is applicable to vehicles using natural
20、gas in accordance with ISO 15403-1 (mono-fuel, bi-fuel, or dual-fuel applications). It is not applicable to injectors intended for high-pressure injection to the combustion chamber, or to the following:a) liquefied natural gas (LNG) fuel system components located upstream of, and including, the vapo
21、rizer;b) fuel containers;c) stationary gas engines;d) container mounting hardware;e) electronic fuel management;f) refuelling receptacles.NOTE 1 It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this part of ISO 15500 and tested ac
22、cording to the appropriate functional tests.NOTE 2 All references to pressure in this part of ISO 15500 are to be considered gauge pressures unless otherwise specified.NOTE 3 This part of ISO 15500 is based upon a service pressure for natural gas as fuel of 20 MPa 200 bar1) settled at 15 C. Other se
23、rvice pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a 25 MPa (250 bar) service pressure system will require pressures to be multiplied by 1,25.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in t
24、his document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 15500-1, Road vehicles Compressed natural gas (CNG) fuel system components Part 1
25、: General requirements and definitionsISO 15500-2:2), Road vehicles Compressed natural gas (CNG) fuel system components Part 2: Performance and general test methods1) 1 bar = 0,1 MPa = 105Pa 1 MPa = 1 N/mm22) To be published. (Revision of ISO 15500-2:2012).INTERNATIONAL STANDARD ISO 15500-7:2015(E)
26、ISO 2015 All rights reserved 1BS ISO 15500-7:2015ISO 15500-7:2015(E)3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 15500-1 and the following apply.3.1duty cyclepercentage of time that the gas injector is operating in the period3.2periodPtime elapsed
27、between the beginning of one injection pulse and the beginning of the next injection pulseNote 1 to entry: It is expressed in milliseconds.3.3fuel rail assemblycomponent consisting of gas injector(s) and fuel rail integrated into one component4 MarkingMarking of the component shall provide sufficien
28、t information to allow the following to be traced:a) the manufacturers or agents name, trademark or symbol;b) the model designation (part number);c) the working pressure and temperature range.The following additional markings are recommended: the direction of flow (when necessary for correct install
29、ation); the type of fuel; electrical ratings (if applicable); the symbol of the certification agency; the type approval number; the serial number or date code; a reference to this part of ISO 15500.NOTE This information can be provided by a suitable identification code on at least one part of the co
30、mponent when it consists of more than one part.5 Construction and assembly5.1 The gas injector shall be in the closed position when de-energized.5.2 The gas injector shall comply with the applicable provisions of ISO 15500-1 and ISO 15500-2, and with the tests specified in Clause 6. Tolerances shoul
31、d follow the specifications of ISO 15500-2.2 ISO 2015 All rights reservedBS ISO 15500-7:2015ISO 15500-7:2015(E)6 Tests6.1 ApplicabilityThe tests required to be carried out are indicated in Table 1.Table 1 Test applicableTest Applicable to injector and fuel rail assemblyApplicable to fuel railTest pr
32、ocedure as re-quired by ISO 15500-2Specific test requirements of this part of ISO 15500Pneumatic strength X X X (see 6.2)Leakage X X XExcess torque resistance X X XBending moment X X XContinued operation X X (see 6.3)Corrosion resistance X X XOxygen ageing X X XOzone ageing X X XHeat Ageing X X XAut
33、omotive Fluids X X XElectrical overvoltages X XNon-metallic material immersion X X XVibration resistance X XBrass material compatibility X X XInsulation resistance X X (see 6.4)6.2 Pneumatic strengthThis test has two parts, with the procedures to be carried out in the sequence as given below.a) Appl
34、y two times the working pressure to the inlet and outlet of the gas injector and/or fuel rail for a period of at least 3 min. On completion of this procedure, the gas injector and/or fuel rail shall remain gas-tight.b) Increase the gas pressure from two times the working pressure up to a maximum of
35、four times the working pressure, until such time as the gas injector and/or fuel rail leaks or bursts.On completion of this procedure, the gas injector and/or fuel rail shall not have burst before leaking.NOTE If the gas injector fails in the closed position due to its construction, then it is consi
36、dered to have passed both parts of this test.The test samples used for this test shall not be used for any other tests.6.3 Continued operation6.3.1 Bench durabilityPrior to this test, the gas injector or fuel rail assembly shall pass the leakage test in accordance with ISO 15500-2:, Clause 6, and th
37、e insulation resistance test given in 6.4. ISO 2015 All rights reserved 3BS ISO 15500-7:2015ISO 15500-7:2015(E)Subject the gas injector or fuel rail assembly to 600 106pulses at working pressure and room temperature. This procedure may be interrupted at 20 % intervals in order to check test criteria
38、.The minimum frequency for the pulses shall be 50 Hz.Upon completion of this test, the gas injector or fuel rail assembly shall pass the leakage test in accordance with ISO 15500-2:, Clause 6, and the insulation resistance test given in 6.4.6.3.2 Temperature6.3.2.1 Hot staticConnect the injector or
39、fuel rail assembly to an appropriate source of pressurized test gas at its working pressure, then expose the pressurized gas injector or fuel rail assembly to an environment with a stabilized temperature of 140 C 2 C for 16 h. The gas injector or fuel rail assembly shall not be operated during this
40、test.6.3.2.2 Cold staticConnect the injector or fuel rail assembly to an appropriate source of pressurized test gas at its working pressure, then expose the pressurized gas injector or fuel rail assembly to an environment with a stabilized temperature of 40 C 2 C or -20 C 2 C, as applicable for 16 h
41、. The gas injector shall not be operated during this test.6.3.2.3 ThermocycleConnect the injector or fuel rail assembly to an appropriate source of pressurized test gas at its working pressure, then expose the pressurized gas injector or fuel rail assembly to the thermocycle in accordance with Figur
42、e 1 for a total of 140 cycles. The gas injector or fuel rail assembly shall be operated only during segment D to E as shown in Figure 1 with a 50 % duty cycle and a period of 10 ms.aRepeat cycle.NOTE Specified temperatures have a tolerance of 2 C.Figure 1 Thermocycle6.3.2.4 RequirementsUpon completi
43、on of the procedures given in 6.3.2.1, 6.3.2.2 and 6.3.2.3, the test samples shall pass the leakage test in accordance with ISO 15500-2:, Clause 6, and the insulation resistance test given in 6.4.4 ISO 2015 All rights reservedBS ISO 15500-7:2015ISO 15500-7:2015(E)6.4 Insulation resistanceThis test i
44、s designed for checking the insulation resistance between the connector pin and the housing.Apply a test voltage of 500 V d.c. for a duration of 60 s; for injectors with circuitry of 3,8 mm pitch or below, 100 V d.c. shall be used.The minimum allowable resistance shall be 10 M. ISO 2015 All rights r
45、eserved 5BS ISO 15500-7:2015ISO 15500-7:2015(E)Bibliography1 ISO 3833, Road vehicles Types Terms and definitions2 ISO 15403-1, Natural gas Natural gas for use as a compressed fuel for vehicles Part 1: Designation of the quality3 ISO/TR 15403-2, Natural gas - Natural gas for use as a compressed fuel
46、for vehicles Part 2: Specification of the quality6 ISO 2015 All rights reservedBS ISO 15500-7:2015BS ISO 15500-7:2015ISO 15500-7:2015(E) ISO 2015 All rights reservedICS 43.060.40Price based on 6 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standard
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