1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 16750-2:2012Road vehicles Environmentalconditions and testing forelectrical and electronicequipmentPart 2: Electrical loadsBS ISO 16750-2:2012 BRITISH STANDARDNational for
2、ewordThis British Standard is the UK implementation of ISO 16750-2:2012.It supersedes BS ISO 16750-2:2010 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee AUE/16, Electrical and electronic equipment.A list of organizations represented on this committee c
3、an beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012 ISBN 978 0 580 80181 5 ICS 43.040.10 Comp
4、liance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2012. Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 16750-2:2012 ISO 2012Road vehic
5、les Environmental conditions and testing for electrical and electronic equipment Part 2: Electrical loadsVhicules routiers Spcifications denvironnement et essais de lquipement lectrique et lectronique Partie 2: Contraintes lectriquesINTERNATIONAL STANDARDISO16750-2Fourth edition2012-11-01Reference n
6、umberISO 16750-2:2012(E)BS ISO 16750-2:2012ISO 16750-2:2012(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, includin
7、g photocopying 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 Swit
8、zerlandBS ISO 16750-2:2012ISO 16750-2:2012(E) ISO 2012 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Test and requirements . 14.1 General . 14.2 Direct current supply voltage . 24.3 Overvoltage 24.4 Superimposed alternating voltage . 3
9、4.5 Slow decrease and increase of supply voltage . 64.6 Discontinuities in supply voltage 64.7 Reversed voltage 134.8 Ground reference and supply offset. 144.9 Open circuit tests . 144.10 Short circuit protection 154.11 Withstand voltage . 164.12 Insulation resistance . 174.13 Electromagnetic compat
10、ibility . 175 Documentation 17Annex A (normative) Test load dump pulse generator verification procedure18Annex B (informative) Origin of load dump pulse in road vehicles electrical systems 19Bibliography .20BS ISO 16750-2:2012ISO 16750-2:2012(E)ForewordISO (the International Organization for Standar
11、dization) 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 committee has been established has the right to
12、 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 electrotechnical standardization.International Stand
13、ards 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 circulated to the member bodies for voting. Publication as an Inter
14、national 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 responsible for identifying any or all such patent rights.ISO 16750-2 w
15、as prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electric and electronic equipment.This fourth edition cancels and replaces the third edition (ISO 16750-2:2010), which has been technically revised.ISO 16750 consists of the following parts, under the general title Road
16、vehicles Environmental conditions and testing for electrical and electronic equipment: Part 1: General Part 2: Electrical loads Part 3: Mechanical loads Part 4: Climatic loads Part 5: Chemical loadsiv ISO 2012 All rights reservedBS ISO 16750-2:2012INTERNATIONAL STANDARD ISO 16750-2:2012(E)Road vehic
17、les Environmental conditions and testing for electrical and electronic equipment Part 2: Electrical loads1 ScopeThis part of ISO 16750 applies to electric and electronic systems/components for road vehicles. This part of ISO 16750 describes the potential environmental stresses and specifies tests an
18、d requirements recommended for the specific mounting location on/in the road vehicle.This part of ISO 16750 describes the electrical loads. Electromagnetic compatibility (EMC) is not covered by this part of ISO 16750. Electrical loads are independent from the mounting location, but can vary due to t
19、he electrical resistance in the vehicle wiring harness and connection system.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 latest edition of the refere
20、nced document (including any amendments) applies.ISO 8820 (all parts), Road vehicles Fuse-linksISO 16750-1, Road vehicles Environmental conditions and testing for electrical and electronic equipment Part 1: GeneralISO 16750-4, Road vehicles Environmental conditions and testing for electrical and ele
21、ctronic equipment Part 4: Climatic loads3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 16750-1 apply.4 Test and requirements4.1 GeneralIf not otherwise specified, the following tolerances shall apply: frequency and time: 5 %; voltages: 0,2 V; resista
22、nce: 10 %;All voltage curves are shown without load.If not otherwise specified, measure all voltages at the relevant terminals of the device under test (DUT). ISO 2012 All rights reserved 1BS ISO 16750-2:2012ISO 16750-2:2012(E)4.2 Direct current supply voltage4.2.1 PurposeThe purpose of this test is
23、 to verify equipment functionality at minimum and maximum supply voltage.4.2.2 Test methodSet the supply voltage as specified in Table 1 or Table 2 to all relevant inputs of the DUT. Operating modes are specified in ISO 16750-1.The voltages listed in Table 1 or Table 2 are relevant within the operat
24、ing temperature range as specified in ISO 16750-4, without time limits.Table 1 Supply voltage for system devices with 12 V nominal voltageCodeMinimum supply voltage, USminVMaximum supply voltage, USmaxVA 6 16B 8 16C 9 16D 10,5 16Table 2 Supply voltage for system devices with 24 V nominal voltageCode
25、Minimum supply voltage, USminVMaximum supply voltage, USmaxVE 10 32F 16 32G 22 32H 18 324.2.3 RequirementsAll DUT functions shall remain class A as defined in ISO 16750-1 when tested in the supply voltage ranges given in Table 1 or Table 2, respectively.4.3 Overvoltage4.3.1 Systems with 12 V nominal
26、 voltage4.3.1.1 Test at a temperature of Tmax 20 C4.3.1.1.1 PurposeThis test simulates the condition where the generator regulator fails, so that the output voltage of the generator rises above normal values.4.3.1.1.2 Test methodHeat the DUT in a hot air oven to a temperature that is 20 C below the
27、maximum operating temperature, Tmax. Apply a voltage of 18 V for 60 min to all relevant inputs of the DUT.2 ISO 2012 All rights reservedBS ISO 16750-2:2012ISO 16750-2:2012(E)4.3.1.1.3 RequirementThe functional status for the DUT shall be minimum class C as defined in ISO 16750-1. Functional status s
28、hall be class A where more stringent requirements are necessary.4.3.1.2 Test at room temperature4.3.1.2.1 PurposeThis test simulates a jump start.4.3.1.2.2 Test methodEnsure that the DUT has stabilized at room temperature. Apply a voltage of 24 V for (60 6) s to all relevant inputs of the DUT.4.3.1.
29、2.3 RequirementThe functional status shall be minimum class D as defined in ISO 16750-1. Functional status shall be class B where more stringent requirements are necessary.4.3.2 Systems with 24 V nominal voltage4.3.2.1 PurposeThis test simulates the condition where the generator regulator fails, so
30、that the output voltage of the generator rises above normal values.4.3.2.2 Test at a temperature of Tmax 20 CHeat the DUT in a hot air oven to a temperature that is 20 C below the maximum operating temperature, Tmax. Apply a voltage of 36 V for 60 min to all relevant inputs of the DUT.4.3.2.3 Requir
31、ementThe functional status shall be minimum class C as defined in ISO 16750-1. Functional status shall be class A where more stringent requirements are necessary.4.4 Superimposed alternating voltage4.4.1 PurposeThis test simulates a residual alternating current on the direct current supply.4.4.2 Tes
32、t methodConnect the DUT as shown in Figure 1. Apply the following test simultaneously to all applicable inputs (connections) of the DUT; the severity level (1, 2, 3 or 4) shall be chosen in accordance with the application: maximum supply voltage, USmax(see Figure 2): 16 V for systems with nominal vo
33、ltage, UN, of 12 V; 32 V for systems with nominal voltage, UN, of 24 V; a.c. voltage (sinusoidal): severity 1: peak to peak voltage, UPP, of 1 V, for UN= 12 V and UN= 24 V; ISO 2012 All rights reserved 3BS ISO 16750-2:2012ISO 16750-2:2012(E) severity 2: peak to peak voltage, UPP, of 4 V, for UN= 12
34、V and UN= 24 V; severity 3: peak to peak voltage, UPP, of 10 V, for UN= 24 V only; severity 4: peak to peak voltage, UPP, of 2 V, for UN= 12 V only; internal resistance of the power supply: 50 m to 100 m; frequency range (see Figure 3): 50 Hz to 25 kHz; type of frequency sweep (see Figure 3): triang
35、ular, logarithmic; sweep duration (see Figure 3): 120 s; number of sweeps: 5 (continuously).Key1 sweep generator2 power supply unit capable of being modulated3 DUT4 positive5 ground or returnFigure 1 Test set-up to superimpose a.c. voltage on component power supply lines4 ISO 2012 All rights reserve
36、dBS ISO 16750-2:2012ISO 16750-2:2012(E)Keyt timeU test voltageUPPpeak to peak voltageUSmaxmaximum supply voltageFigure 2 Test voltage with superimposed sinusoidal a.c. voltageKeyt time, in secondsf frequency, logarithmic scale, in hertz1 one cycleFigure 3 Frequency sweep ISO 2012 All rights reserved
37、 5BS ISO 16750-2:2012ISO 16750-2:2012(E)4.4.3 RequirementThe functional status shall be class A as defined in ISO 16750-1.4.5 Slow decrease and increase of supply voltage4.5.1 PurposeThis test simulates a gradual discharge and recharge of the battery.4.5.2 Test methodApply the following test simulta
38、neously to all applicable inputs (connections) of the DUT.Decrease the supply voltage from the minimum supply voltage, USmin, to 0 V, then increase it from 0 V to USmin, applying a change rate of (0,5 0,1) V/min linear, or in equal steps of not more than 25 mV.4.5.3 RequirementThe functional status
39、inside the supply voltage range (see Table 1 or Table 2) shall be as specified in 4.2.3. Outside that range, it shall be minimum class D as defined in ISO 16750-1. The functional status of class C may be specified where more stringent requirements are necessary.4.6 Discontinuities in supply voltage4
40、.6.1 Momentary drop in supply voltage4.6.1.1 PurposeThis test simulates the effect when a conventional fuse element melts in another circuit.4.6.1.2 Test methodApply the test pulse (see Figures 4 and 5) simultaneously to all relevant inputs (connections) of the DUT. The rise time and fall time shall
41、 be not more than 10 ms.Keyt time, in secondsU test voltage, in voltsUSminminimum supply voltageFigure 4 Short voltage drop for systems with 12 V nominal voltage6 ISO 2012 All rights reservedBS ISO 16750-2:2012ISO 16750-2:2012(E)Keyt time, in secondsU test voltage, in voltsUSminminimum supply voltag
42、eFigure 5 Short voltage drop for systems with 24 V nominal voltage4.6.1.3 RequirementThe functional status shall be minimum class B as defined in ISO 16750-1. Reset is permitted upon agreement.4.6.2 Reset behaviour at voltage drop4.6.2.1 PurposeThis test verifies the reset behaviour of the DUT at di
43、fferent voltage drops. This test is applicable to equipment with reset function, e.g. equipment containing microcontroller(s).4.6.2.2 TestApply the test pulse simultaneously in Figure 6 to all relevant inputs (connections) and check the reset behaviour of the DUT.Decrease the supply voltage by 5 % f
44、rom the minimum supply voltage, USmin, to 0,95USmin. Hold this voltage for 5 s. Raise the voltage to USmin. Hold USminfor at least 10 s and perform a functional test. Then decrease the voltage to 0,9USmin. Continue with steps of 5 % of USmin, as shown in Figure 6, until the lower value has reached 0
45、 V. Then raise the voltage to USminagain. ISO 2012 All rights reserved 7BS ISO 16750-2:2012ISO 16750-2:2012(E)Keyt time, in secondsU test voltage measured as a percentage of USminUSminminimum supply voltageFigure 6 Supply voltage profile for the reset test4.6.2.3 RequirementThe functional status sha
46、ll be minimum class C as defined in ISO 16750-1.4.6.3 Starting profile4.6.3.1 PurposeThis test verifies the behaviour of a DUT during and after cranking.4.6.3.2 Test methodApply the starting profile 10 times, as specified in Figure 7 and Table 3 or Table 4, simultaneously to all relevant inputs (con
47、nections) of the DUT. A break of 1 s to 2 s between the starting cycles is recommended. One or more profiles as described in Tables 3 and 4 shall be chosen in accordance with the application.8 ISO 2012 All rights reservedBS ISO 16750-2:2012ISO 16750-2:2012(E)Keyt timeU test voltagetffalling slopetrr
48、ising slopet6, t7, t8duration parameters (in accordance with Table 3 and Table 4)UBsupply voltage for generator not in operation (see ISO 16750-1)USsupply voltageUS6supply voltage at t6af = 2 Hz.Figure 7 Starting profile ISO 2012 All rights reserved 9BS ISO 16750-2:2012ISO 16750-2:2012(E)Table 3 Sta
49、rting profile values for systems with 12 V nominal voltage (UN)ParameterLevelI II III IVVoltage VUS68 (0,2) 4,5 (0,2) 3 (0,2) 6 (0,2)US9,5 (0,2) 6,5 (0,2) 5 (0,2) 6,5 (0,2)Duration mstf5 ( 0,5) 5 ( 0,5) 5 ( 0,5) 5 ( 0,5)t615 (1,5) 15 ( 1,5) 15 ( 1,5) 15 ( 1,5)t750 ( 5) 50 ( 5) 50 ( 5) 50 ( 5)t81 000 ( 100) 10 000 ( 1 000) 1 000 ( 100) 10 000 ( 1 000)tr40 ( 4) 100 ( 10) 100 ( 10) 100 ( 10)Minimum functional statusAaBaBaAaAbBbCbBbBc
