1、BSI Standards PublicationBS ISO 3468:2014Passenger cars Windscreendefrosting and demistingsystems Test methodBS ISO 3468:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 3468:2014. The UK participation in its preparation was entrusted to TechnicalCommittee
2、AUE/12, Safety related to occupants.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 Inst
3、itution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 79486 5ICS 43.040.65Compliance 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 May 2014.Amendments/cor
4、rigenda issued since publicationDate T e x t a f f e c t e dBS ISO 3468:2014 ISO 2014Passenger cars Windscreen defrosting and demisting systems Test methodVoitures particulires Dispositif de dgivrage et de dsembuage du pare-brise Mthode dessaiINTERNATIONAL STANDARDISO3468Third edition2014-06-01Refer
5、ence numberISO 3468:2014(E)BS ISO 3468:2014ISO 3468:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, i
6、ncluding 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 body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41
7、 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 3468:2014ISO 3468:2014(E) ISO 2014 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Test method for defrosting systems . 24.1 Performance requ
8、irements 24.2 Test equipment . 24.3 Test preparation . 24.4 Test condition . 34.5 Test procedure . 35 Test method for demisting systems 45.1 Performance requirements 45.2 Test equipment . 55.3 Test preparation . 55.4 Test conditions 75.5 Test procedure . 7Annex A (informative) Recommended method of
9、recording cleared area . 9Bibliography .10BS ISO 3468:2014ISO 3468:2014(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 ISO tec
10、hnical 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 closel
11、y with the International Electrotechnical Commission (IEC) on all matters of electrotechnical 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 nee
12、ded for the different types of ISO documents should be noted. This document was drafted 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
13、 rights. ISO shall not be held responsible for identifying any or all such patent rights. 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 i
14、n this document is information given for the convenience of users and does not constitute 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 Barrie
15、rs to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 17, Visibility.This third edition cancels and replaces ISO 3468:1989 and ISO 3470:1989, which have been technically revised.iv ISO 201
16、4 All rights reservedBS ISO 3468:2014ISO 3468:2014(E)IntroductionIt is not necessary for the tests specified in Clauses 4 and 5 to be repeated on types of power-driven vehicles which do not differ from one another in respect of the following essential features, which affect defrosting/demisting perf
17、ormance:a) shape, size, and surface characteristics of the windscreen;b) characteristics of each system designated by the vehicle manufacturer as contributing to windscreen defrosting/demisting;c) number of seats as designated by the vehicle manufacturer.It can be possible to carry out tests of a si
18、milar nature on front windscreens and rear-windows simultaneously. ISO 2014 All rights reserved vBS ISO 3468:2014BS ISO 3468:2014Passenger cars Windscreen defrosting and demisting systems Test method1 ScopeThis International Standard specifies the test method for passenger car (ISO 3833:1977, 3.1.1)
19、 windscreen defrosting and demisting systems, when these are fitted.This International Standard does not specify reference areas or levels of performance.The test condition of 18 C 3 C specified for defrosting systems will meet the majority of cold climatic requirements.The tests for demisting syste
20、ms are conducted at a temperature of 3C 1C, since this is the practical minimum temperature at which mist, as defined in 3.7, can normally occur.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application.
21、For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1176:1990, Road vehicles Masses Vocabulary and codesISO 3833:1977, Road vehicles Types Terms and definitionsISO 6549:1980, Road vehicles
22、Procedure for H-point determination1)3 Terms and definitionsFor the purposes of this document, the following definitions apply.3.1defrosted areaarea of the outer glazed surface of the windscreen having a dry surface or covered with melted or partially melted (wet) frost, excluding any area of the wi
23、ndscreen covered with dry frost3.2defrostingelimination of frost and/or ice covering the outer glazed surface of the windscreen by the operation of the windscreen defrosting and/or windscreen wiping and washing systems3.3windscreen defrosting systemdevice, or combination of devices, intended by the
24、vehicle manufacturer to eliminate frost or ice from the glazed surfaces of the windscreen and thus restore visibility, together with the necessary accessories and controls3.4windscreen wiping systemdevice for wiping the windscreen outer glazed surface, together with the necessary accessories and con
25、trols1) From 2021-06-01, ISO 20176 will cancel and replace ISO 6549:1999.INTERNATIONAL STANDARD ISO 3468:2014(E) ISO 2014 All rights reserved 1BS ISO 3468:2014ISO 3468:2014(E)3.5windscreen washing systemdevice for storing washer solution and applying it to the windscreen outer glazed surface togethe
26、r with the necessary controls3.6road loadpower output, as indicated by the vehicle manufacturer, required to move the vehicle on a flat road at a specified speed through still air at 20 C, with a standard barometric pressure of 1 013 mbar; the mass of the vehicle being equal to the complete vehicle
27、kerb mass, in accordance with ISO 1176 (ISO-M06) plus 150 kg, i.e. representing the driver and passenger on the front seatsNote 1 to entry: Road load takes account of transmission friction, rolling friction, and air resistance.3.7mistfilm of condensate on interior glazed surface3.8demistingeliminati
28、on of mist from the windscreen by the operation of the windscreen demisting system3.9windscreen demisting systemdevice, or combination of devices, intended by the vehicle manufacturer to remove mist from the windscreen and thus restore visibility, together with the necessary accessories and controls
29、4 Test method for defrosting systems4.1 Performance requirementsWhen tested in accordance with the following procedure, and at the temperature specified, the defrosting system shall be capable of defrosting specified percentages of specified areas after stated time intervals from the start of the te
30、st.4.2 Test equipment4.2.1 Cold chamber, large enough to contain the complete vehicle and capable of ensuring that temperatures of either 8 C 2 C or 18 C 3 C can be maintained throughout the test.4.2.2 Spray gun, capable of applying liquid to the outer glazed surface of the windscreen and having the
31、 following characteristics: nozzle diameter: 1,7 mm; operating pressure: 350 kPa 20 kPa;2) nominal flow rate: 395 ml/min; projection cone diameter at 200 mm from nozzle: 300 mm.4.3 Test preparation4.3.1 Carry out all necessary vehicle preparation, e.g. cleaning and marking (if required) of the winds
32、creen and installation of necessary instrumentation to ensure a satisfactory test and to record the test conditions, prior to the temperature stabilization in 4.3.4.2) 1 kPa = 10-2 bar2 ISO 2014 All rights reservedBS ISO 3468:2014ISO 3468:2014(E)4.3.2 Thoroughly degrease the outer and inner glazed s
33、urfaces using an appropriate degreasing agent. When dry, apply a 3 % to 10 % solution of ammonia in water, allow to dry, and, finally, wipe with a dry cotton cloth or paper towel that contains no additives.4.3.3 Ensure that the chamber (4.2.1) is at or below the specified test temperature before the
34、 start of the stabilizing period.4.3.4 In the case of an electric vehicle or a plug-in hybrid electric vehicle, the high voltage battery should be fully charged prior to soaking.4.3.5 Place the vehicle in the chamber (4.2.1). Maintain the temperature in the chamber throughout the soak and test perio
35、ds at eithera) 18 C 3 C, full temperature range, orb) 8 C 2 C, restricted temperature range.4.3.6 Keep the vehicle, with the engine stopped, at the specified test temperature for a period of 10 h. This period can be shortened if instruments are available to check that the engine coolant, lubricant,
36、and vehicle internal air have stabilized at the specified test temperature.4.4 Test condition4.4.1 Measure the chamber temperature at the same height as the middle of the windscreen at a location, such that the temperature is not significantly affected by heat from the vehicle under test or by cold
37、air entering the chamber.4.4.2 Measure the horizontal component of the air velocity; cooling the chamber immediately prior to the test, at a point located on the longitudinal centreline of the vehicle, 300 mm ahead of the base of the windscreen, at a level half-way between the windscreen top and bot
38、tom. The velocity of this component shall be as low as possible and in any case less than 8 km/h.4.5 Test procedure4.5.1 Set the vehicle defrosting system controls (see 3.3) for maximum defrost as recommended by the vehicle manufacturer.4.5.2 After the temperature stabilization in 4.3.5, create an e
39、ven coating of frost of 0,044 g/cm2over the entire outer glazing surface of the windscreen by means of the spray gun (4.2.2).4.5.3 The engine bonnet (hood), doors, windows, and vents, except the air intakes and outlets of the defrosting and ventilating system, shall be closed, except that one or two
40、 windows can be open with a total distance of 25 mm depending on the mode of operation as indicated by the vehicle manufacturer.4.5.4 After the frost coating has been formed, an additional period of between 30 min and 40 min shall elapse before the start of the recorded test period.4.5.5 After the p
41、eriod specified in 4.5.4 has elapsed, one or two observers can enter the vehicle; start the engine. An external power source can be used to start it but shall then be disconnected. The test period commences when the engine has been started and is running under its own power. Bring the defrosting sys
42、tem into operation as prescribed by the vehicle manufacturer, with the vehicle in the condition specified by the manufacturer for satisfactory operation at low temperature. The defroster blower can be turned on at any time. ISO 2014 All rights reserved 3BS ISO 3468:2014ISO 3468:2014(E)4.5.6 The tota
43、l duration of the test is 40 min. Depending on the vehicle powertrain type, the powertrain load, and speed through the test, the conditions specified in 4.5.6.1 to 4.5.6.3 shall apply.4.5.6.1 For vehicles equipped with a conventional mechanical powertrain during the first 5 min of the test period, t
44、he engine speed can be adjusted according to manufacturers specification, recommended for warming up when starting in cold weather. For the remaining 35 min of the test, the engine shall be run at eithera) speed as indicated by the vehicle manufacturer, but in no case exceeding 50% of the speed at w
45、hich it develops maximum power, orb) if the vehicle manufacturer desires, on a chassis dynamometer, the engine speed and load shall not exceed the speed and equivalent road load at 40 km/h in the gear and with the tyre inflation pressures recommended by the vehicle manufacturer for the road load.4.5
46、.6.2 For electric vehicles and plug-in hybrid vehicles, or any vehicle equipped with a powertrain with a specified pure electric range, the powertrain load shall not exceed 50 % of the maximum pure electric load at either 8 C or 18 C, according to the manufacturers powertrain calibration specificati
47、on.4.5.6.3 For hybrid electric vehicles, the test shall be run as described in 4.5.6.1, with the powertrain control logic according to the manufacturers specification at either 8 C or 18 C.4.5.7 The windscreen wipers can be used during the test in accordance with the instructions of the vehicle manu
48、facturer if they can commence operation without manual assistance.4.5.8 If the vehicle battery is used, it shall be fully charged; an external power source can supplement or replace the battery to meet the requirement of 4.5.9.4.5.9 The voltage measured between the earth and the point in the common
49、live line that can be identified and contacted nearest to the windscreen defrosting system shall be the systems rated voltage (if it differs from the vehicles rated voltage) or 1,15 the rated voltage specified for the vehicle 5 %.4.5.10 If standard equipment on the vehicle model is under test, the following devices can be activated: rear window defrost device, heated seats, supplemental heat source such as Positive Temperature Coefficient (PTC) heaters or fuel operated heater. Di
