ECE/TRANS/WP.29/GRRF/2015/43
United Nations / ECE/TRANS/WP.29/GRRF/2015/43 Amend 1/ Economic and Social Council / Distr.: General
6 July 2015
Original: English
Economic Commission for Europe
Inland Transport Committee
World Forum for Harmonization of Vehicle Regulations
Working Party on Brakes and Running Gear
Eightieth session
Geneva, 15-18 September 2015
Item 9(a) of the provisional agenda
Steering equipment – Regulation No. 79
Proposal for an amendment to Regulation No. 79 (Steering equipment)
Submitted by the experts from the International Association of theBody and Trailer Building Industry[*]
The text reproduced below was prepared by the International Association of the Body and Trailer Building Industry (CLCCR) introducing into UN Regulation No. 79 an amendment removing design restrictions and allowing the vehicle manufacturer to use new technologies that would have previously been prohibited. It supersedes ECE/TRANS/WP.29/GRRF/2013/25, ECE/TRANS/WP.29/GRRF/2014/8, ECE/TRANS/WP.29/GRRF/2015/8 and Informal document GRRF/79/21. The modifications to the existing text of the Regulation are marked in bold for new or strikethrough for deleted characters.
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ECE/TRANS/WP.29/GRRF/2015/43
I.Proposal
Table of Contents,addanewAnnex7, toread:
"7Specialprovisionsforthepoweringoftrailersteeringsystemsfromthetowing vehicle."
Introduction,amendtoread:
"Introduction
TheintentionoftheRegulation…
…havebeendefinedas "Autonomous SteeringSystems".
ThisRegulationalsopreventstheapprovalofpositivesteeringoftrailersby means of usingenergysupplyandelectricalcontrolfromthetowingvehicleas therearecurrently notanynostandardsapplicabletothisapplication energysupplyconnectorsortocontroltransmissiondigitalinformationinterchange.It isexpected thatatsometimein thefuturetheInternational StandardsOrganization(ISO)Standard,ISO11992willbeamendedtotakeaccountofincludemessages associatedwiththetransmissionofsteeringcontroldata."
Paragraph1.2.3.,tobedeleted.
Paragraph1.2.4.,tobedeleted.
Paragraph2.5.2.2.,amendtoread:
"2.5.2.2. "Articulated steering" means equipment in which the steering forces are producedby achangein direction ofthetowingvehicleandinwhich the movementofthesteeredtrailerwheelsisfirmlylinkedtotherelativeangle betweenthelongitudinalaxis ofthetowingvehicleandthatofthetrailer;"
Addanewparagraph2.5.2.5.,toread:
"2.5.2.5."Full-powersteeringequipment"meansequipmentinwhichthesteering forces are providedsolelybyoneor moreenergysupplies;"
Paragraph5.1.3., amendtoread:
"5.1.3.Thedirection ofoperation ofthe steering controlshall correspondto the intendedchangeof directionof thevehicleandthereshallbeacontinuous relationshipbetween thesteeringcontrol deflectionandthesteeringangle. Theserequirementsdonotapplytosystemsthatincorporateanautomatically commandedorcorrectivesteeringfunction,ortoauxiliarysteeringequipment.
Theserequirementsmayalsonotnecessarilyapplyinthecaseoffullpower steeringwhen thevehicleisstationary,duringlowspeedmanoeuvresat speedsuptoamaximumspeed of15km/handwhen thesystemisnot energised."
Addanewparagraph5.1.7., toread:
"5.1.7.Towingvehiclesequippedwithaconnectiontosupplyelectricalenergyto the steeringsystemofthe trailer and trailersthatutilise electricalenergy fromthetowingvehicletopowerthetrailersteeringsystemshallfulfil the relevantrequirements ofAnnex7."
Paragraphs 5.1.7. to5.1.10.(former), renumber as5.1.8.to5.1.11.
Annex 1,
Addanewitem7., toread:
"7.Applicableonlytotowingvehicles
7.1.The towing vehicle is/is not2 equipped with an electrical connector fulfillingtherelevantrequirements ofAnnex7
7.2.Themaximum currentavailableis…………………………………….A3"
Addanewitem8. with a new footnote 3, toread:
"8.Applicableonlytotrailers
8.1.ThesteeringsystemofthetrailerfulfilstherelevantprovisionsofAnnex7 toUNRegulationNo.79...... Yes/No2"
8.2.Themaximumcurrentrequiredforthe trailersteeringsystemis A3
8.3.Thetrailersteeringsystemis/isnot2 abletosupplyauxiliaryequipment onthetrailerwithelectricalenergy.
3As definedbythevehiclemanufacturer–seeparagraphs2.3.and3.1.ofAnnex7 as appropriate."
Items 7.to16. (former), renumber as 9.to18.
Annex 5,
Paragraph2.1.1., amendtoread:
"2.1.1.The hydraulic lines of hydraulictransmission shallbe capableof aburst pressureatleastfourtimesthemaximumnormal servicepressure(T)specified bythevehiclemanufacturer.Hoseassemblies shall complywithISO Standards1402:1994,6605:1986and7751:1991.
In the case of steering systems fulfilling the requirements of Annex 7, the hydraulic lines of hydraulictransmission shallbe capableof aburst pressure[X]timesthemaximumnormal operatingpressure(T)specified bythevehiclemanufacturer.
Paragraph2.3.1., amendtoread:
"2.3.1.Thesteeringtransmissionmustshallbeprotectedfromexcesspressurebya pressurelimitingvalvewhichoperatesatbetween1.51.1Tand2.2T.The operatingpressureof thepressurelimitingvalveshall beof avaluethatis compatiblewiththeoperatingcharacteristicsof thesteeringsystem installedon the vehicle.Thisshall be confirmedby the vehicle manufactureratthetimeoftypeapproval."
AddanewAnnex7, toread:
"Annex7
Special provisionsforthepoweringof trailersteeringsystems fromthetowingvehicle.
1.General
Therequirementsof thisAnnexshall applytotowingvehiclesandtrailers whereelectrical energyissuppliedfrom thetowingvehicletofacilitate operationofthesteeringsysteminstalledonthetrailer.
2.Requirements fortowingvehicles
2.1.EnergySupply
2.1.1.Thevehiclemanufacturershalldefinethecapacityoftheenergysource thatwillenable thecurrentdefinedinparagraph2.3. below tobeavailable forthe trailerduringnormaloperationofthevehicle.
2.1.2.Thedriver’smanualshallincludeinformationtoadvisethedriveronthe electricalenergyavailablefor thetrailersteeringsystemandthatthe electricalinterfaceshallnotbeconnectedwhenthecurrentrequirement marked on the trailer exceeds that which can be supplied by the towing vehicle.
2.1.3.The power supply provided by the connector referenced in paragraph 2.5. below shall be used for the powering of the trailer steering system. However, in all cases the provisions of paragraph 3.3 below shall apply.
2.2.The nominal operating voltage is 24V.
2.3.The maximum current supply available at the connector referenced in paragraph 2.5.2. below shall be defined by the towing vehicle manufacturer.
2.4.Protection of the electrical system
2.4.1.The electrical system of the towing vehicle shall be protected from an overload or short circuit in the supply to the trailer steering system.
2.5.Wiring and Connectors
2.5.1.The cables used to supply the trailer electrical energy shall have a conductor cross-sectional area compatible with the continuous current defined in paragraph 2.3. above.
2.5.2.Until a uniform standard has been defined the connector used to connect to the trailer shall fulfil the following:
(a)The pins shall have a current carrying capacity compatible with the maximum continuous current defined in paragraph 2.3. above;
(b)Until uniform standards have been agreed the environmental protection of the connector shall be appropriate to the application and included in the Annex 6 assessment; and
(c)The connector shall not be interchangeable with an existing electrical connector currently used on the towing vehicle i.e. ISO 7638, ISO 12098, etc.
2.6.Marking
2.6.1.Thetowing vehicleshallbemarked to indicatethemaximumcurrent availableforthetraileras definedinparagraph2.3. above.
Themarkingshall beindelibleandpositionedsothatitisvisiblewhen connectingtheelectricalinterfacereferencedinparagraph2.5.2.above.
3.Requirements fortrailers
3.1.Themaximumcurrentrequirementofthetrailersteeringsystemshallbe definedbythevehiclemanufacturer.
3.2.The nominaloperatingvoltageis 24V.
3.3.Theelectricalenergyavailablefromthetowingvehicleshallonlybeused as follows:
(a) Exclusivelyforuse bythe trailersteeringsystem;
or
(b) Forthe trailersteeringsystemandtopowerauxiliarysystems onthe trailer providedthesteeringsystemhaspriorityandisprotected fromanoverloadexternal tothesteeringsystem.Thisprotection shallbeafunctionofthe trailersteeringsystem.
3.4.WiringandConnectors
3.4.1.Thecablesusedtosupplythetrailersteeringsystemwithelectricalenergy shall haveaconductorcrosssectionalarea compatiblewiththeenergy requirements ofthesteeringsysteminstalledonthetrailer.
3.4.2.Untilauniformstandardhasbeendefinedtheconnectorusedtoconnect tothetrailershallfulfilthefollowing:
(a)Thepinsshallhaveacurrentcarryingcapacitycompatiblewiththe maximumcurrent defined bythe vehicle manufacturerin paragraph3.1.above;
(b)Until uniform standards havebeenagreedtheenvironmental protectionof theconnectorshall beappropriatetotheapplication andincludedintheAnnex6assessment;
(c)Theconnectorshallnot be interchangeable with an existing electricalconnectorcurrentlyusedonthetowingvehicle,i.e.ISO7638,ISO12098,etc.
3.5.Failurewarning:
Failureswithintheelectriccontroltransmissionofthesteeringsystem shallbedirectlyor indirectlydisplayedto thedriverasrequiredby paragraph5.4.1.1.oftheRegulation.The meansofproviding driver warningshall bedefinedbythevehiclemanufacturerasrequiredby paragraph3.4.3. ofAnnex6.
3.6.Demonstrationoftheoperationofthesteeringsystem
3.6.1.Atthe timeoftypeapprovalthetrailermanufacturershalldemonstrate to theTechnical Servicethefunctionalityof thesteeringsystem byfulfilling therelevantperformancerequirementsspecifiedwithintheRegulation andits Annexes.
3.6.2.Failure Conditions:
3.6.2.1.Under steady state conditions:
Intheeventofthetrailerbeingcoupledtoatowingvehiclethatdoesnot haveanelectricalsupplyfor the trailersteeringsystem,or thereis abreakintheelectricalsupplytothetrailer steeringsystem orthereisafailurein theelectriccontrol transmissionof thetrailersteeringcontrol systemit shallbe demonstratedthatthe trailerfulfilsallrelevantrequirements ofparagraph6.3.oftheRegulationfortheintactsystem.
3.6.2.2.Under transient conditions
The vehicle manufacturer shall provide the technical services with their test procedures and results forThe transient behaviour of the vehicle in the case of failurewithin the electric control transmission of the steering systemshall be evaluated to ensure vehicle stability is maintained during the transition following the failure and shall be assessedby fulfilling the following:
a)By applying the test procedure and requirements defined within paragraph 6.3.1. of the Regulation. 1/
b)By applying the test procedure and requirements defined within paragraph 6.3.3. of the Regulation.1/
3.6.3.Ifthetrailersteeringsystemutiliseshydraulictransmissiontooperatethe steering,therequirements ofAnnex5shallapply.
3.7.Marking
3.8.1.Trailersequippedwithaconnectorforthesupplyofelectricalenergyto thetrailersteeringsystem shall bemarkedtoincludethefollowing information:
(a)Themaximumcurrentrequirementforthetrailersteeringsystem as definedinparagraph3.1.above.
(b)Thefunctionalityof thetrailersteeringsystemincludingtheimpact onmanoeuvrabilitywhentheconnector isconnectedand disconnected.
Themarkingshall beinindelibleform andpositionedsothat itisvisible whenconnecting to theelectrical interfacereferencedinparagraph3.3.2. above."
1/The technical service may accepted the test results supplied by the trailer manufacturer to demonstrate compliance with the transient tests.
II.Justification
1.Attheseventy-fourthsessionofGRRF,CLCCRpresentedGRRF-74-37,whichdid notproposeanyamendmentstoUNRegulation No.79butsought tobring to theattention of GRRFthat,currently,adesignrestrictionis appliedwhichprevents trailersfromutilisingany form ofenergyfrom thetowingvehicle.Followingdiscussion,anumberofdelegates indicatedtheirsupportforanamendmenttoUNRegulationNo.79by removingthis restriction.
2.At the seventy-fifth GRRFsession,CLCCR presented ECE/TRANS/WP.29/GRRF/2013/25.Commentswerereceivedfrom the expertsfrom Japan andtheNetherlands.AdditionallytheexpertfromInternationalOrganisationofVehicles Manufacturers (OICA)tabledGRRF-75-11.
3.Thisdocumentcontainsamendmentswhichtakeaccountofthecommentsmadeby severalexperts, including thosefromOICAasfollows:
(a)Removethereferenceto"IP54"butrequiretheconnector tohavean environmentalprotectionappropriatetotheapplicationandthatthespecificationof theconnectorshouldbeincludedintheAnnex6assessment.
(b)Itisconsideredthat,atthisjuncture,whenthetrailerpowersteeringsystems arevery muchin theirinfancy itwould,by specifyingamaximum current,introduce anotherdesign restriction whichshouldbe avoided.Howevertoensuresafeoperation ofthetrailerimprovedfailuremodeshavebeendefinedandmoreinformationhas beenmade availabletoensurethatthedriveris suitablyinformed on anylimitations placedontheoperationoftrailersteering system.
(c)DiscussionshavebeenongoingwiththeexpertsfromOICAonthemajorityof theirconcernsaddressedeitherin ECE/TRANS/WP.29/GRRF/2013/25 orthis document.
4.At the seventy-eighth session of GRRF, document ECE/TRANS/WP.29/GRRF/2014/8waspresented.However,itwaspointed out that there wereanumberofissuesstillneeded tobe clarified on therequirementsin the eventof electricalfailureornon-connectionof thepowersupply.Theseissueshavenowbeen addressedbyrequiringthat,intheeventofsuchafailureornon-connection, the requirements definedinparagraph6.3. oftheRegulation applyingtoatrailerwhennofaultispresent.This isconsideredappropriateforsuch atraileroperatingbehindatowingvehiclethatisnot equippedwith therequisitepowersupplyforthetrailersteeringsystem until uniform provisionshavebeendefinedforaconnector andthatconnectorisingeneraluse.
5. Additionallycomments were receivedfrombothEuropeanAssociationofAutomotive Suppliers(CLEPA)andOICAon theuseoftheelectrical energysuppliedby thetowing vehicle.Theirconcernshavebeenaddressedinparagraphs2.1.3.and3.3.toAnnex 7where thelatterdefinesconditionsfortheuseofelectricalenergy.Thisfollowstheprinciplesused inUNRegulationNo.13ontheelectricalenergyavailablefromthe ISO7638connector.
6.Attheseventyninthsessionof GRRF,documentECE/TRANS/WP.29/GRRF/2015/8 waspresented. Delegates fromDenmark and Germanycommented onthecontent ofa numberofparagraphshowevertheirconcernswere resolvedduringdiscussion.However, the delegatefromJapanraisedtheissueofthetrailermountedwarningsignalconformingwith requirementsprescribedinRegulation No.48.ItwasagreedthattheUNSecretariatwould raisethesubjectattheAprilsessionofGRE(seeInformalDocumentGRE-73-09).
7.Asnoformalagreementwas reachedwithrespecttotheapplicationofUNRegulation48withrespecttoatrailermountedwarningsignaltheaboveproposal removes reference tothe requirement for a trailer mounted warning signal. However theexistingprovisions with respecttofailurewarningstillapply.
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[*]*Inaccordancewith the programmeofworkoftheInland TransportCommittee for2012–2016 (ECE/TRANS/224,para. 94andECE/TRANS/2012/12,programmeactivity 02.4),the WorldForum willdevelop,harmonizeandupdateRegulationsinordertoenhance theperformanceofvehicles. The presentdocumentissubmittedinconformitywiththatmandate