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1ELECTRONICPOWERSTEERINGSYSTEMWHATITISELECTRICALLYPOWEREDSTEERINGUSESANELECTRICMOTORTODRIVEEITHERTHEPOWERSTEERINGHYDRAULICPUMPORTHESTEERINGLINKAGEDIRECTLYTHEPOWERSTEERINGFUNCTIONISTHEREFOREINDEPENDENTOFENGINESPEED,RESULTINGINSIGNIFICANTENERGYSAVINGSHOWITWORKSCONVENTIONALPOWERSTEERINGSYSTEMSUSEANENGINEACCESSORYBELTTODRIVETHEPUMP,PROVIDINGPRESSURIZEDFLUIDTHATOPERATESAPISTONINTHEPOWERSTEERINGGEARORACTUATORTOASSISTTHEDRIVERINELECTROHYDRAULICSTEERING,ONEELECTRICALLYPOWEREDSTEERINGCONCEPTUSESAHIGHEFFICIENCYPUMPDRIVENBYANELECTRICMOTORPUMPSPEEDISREGULATEDBYANELECTRICCONTROLLERTOVARYPUMPPRESSUREANDFLOW,PROVIDINGSTEERINGEFFORTSTAILOREDFORDIFFERENTDRIVINGSITUATIONSTHEPUMPCANBERUNATLOWSPEEDORSHUTOFFTOPROVIDEENERGYSAVINGSDURINGSTRAIGHTAHEADDRIVINGWHICHISMOSTOFTHETIMEINMOSTWORLDMARKETSDIRECTELECTRICSTEERINGUSESANELECTRICMOTORATTACHEDTOTHESTEERINGRACKVIAAGEARMECHANISMNOPUMPORFLUIDAVARIETYOFMOTORTYPESANDGEARDRIVESISPOSSIBLEAMICROPROCESSORCONTROLSSTEERINGDYNAMICSANDDRIVEREFFORTINPUTSINCLUDEVEHICLESPEEDANDSTEERING,WHEELTORQUE,ANGULARPOSITIONANDTURNINGRATEWORKINGINDETAILASTEERINGSENSORISLOCATEDONTHEINPUTSHAFTWHEREITENTERSTHEGEARBOXHOUSINGTHESTEERINGSENSORISACTUALLYTWOSENSORSINONEATORQUESENSORTHATCONVERTSSTEERINGTORQUEINPUTANDITSDIRECTIONINTOVOLTAGESIGNALS,ANDAROTATIONSENSORTHATCONVERTSTHEROTATIONSPEEDANDDIRECTIONINTOVOLTAGESIGNALSANINTERFACECIRCUITTHATSHARESTHESAMEHOUSINGCONVERTSTHESIGNALSFROMTHE2TORQUESENSORANDROTATIONSENSORINTOSIGNALSTHECONTROLELECTRONICSCANPROCESSINPUTSFROMTHESTEERINGSENSORAREDIGESTEDBYAMICROPROCESSORCONTROLUNITTHATALSOMONITORSINPUTFROMTHEVEHICLESSPEEDSENSORTHESENSORINPUTSARETHENCOMPAREDTODETERMINEHOWMUCHPOWERASSISTISREQUIREDACCORDINGTOAPREPROGRAMMEDFORCEMAPINTHECONTROLUNITSMEMORYTHECONTROLUNITTHENSENDSOUTTHEAPPROPRIATECOMMANDTOTHEPOWERUNITWHICHTHENSUPPLIESTHEELECTRICMOTORWITHCURRENTTHEMOTORPUSHESTHERACKTOTHERIGHTORLEFTDEPENDINGONWHICHWAYTHEVOLTAGEFLOWSREVERSINGTHECURRENTREVERSESTHEDIRECTIONTHEMOTORSPINSINCREASINGTHECURRENTTOTHEMOTORINCREASESTHEAMOUNTOFPOWERASSISTTHESYSTEMHASTHREEOPERATINGMODESANORMALCONTROLMODEINWHICHLEFTORRIGHTPOWERASSISTISPROVIDEDINRESPONSETOINPUTFROMTHESTEERINGTORQUEANDROTATIONSENSORSINPUTS;ARETURNCONTROLMODEWHICHISUSEDTOASSISTSTEERINGRETURNAFTERCOMPLETINGATURN;ANDADAMPERCONTROLMODETHATCHANGESWITHVEHICLESPEEDTOIMPROVEROADFEELANDDAMPENKICKBACKIFTHESTEERINGWHEELISTURNEDANDHELDINTHEFULLLOCKPOSITIONANDSTEERINGASSISTREACHESAMAXIMUM,THECONTROLUNITREDUCESCURRENTTOTHEELECTRICMOTORTOPREVENTANOVERLOADSITUATIONTHATMIGHTDAMAGETHEMOTORTHECONTROLUNITISALSODESIGNEDTOPROTECTTHEMOTORAGAINSTVOLTAGESURGESFROMAFAULTYALTERNATORORCHARGINGPROBLEMTHEELECTRONICSTEERINGCONTROLUNITISCAPABLEOFSELFDIAGNOSINGFAULTSBYMONITORINGTHESYSTEMSINPUTSANDOUTPUTS,ANDTHEDRIVINGCURRENTOFTHEELECTRICMOTORIFAPROBLEMOCCURS,THECONTROLUNITTURNSTHESYSTEMOFFBYACTUATINGAFAILSAFERELAYINTHEPOWERUNITTHISELIMINATESALLPOWERASSIST,CAUSINGTHESYSTEMTOREVERTBACKTOMANUALSTEERINGADASHEPSWARNINGLIGHTISALSOILLUMINATEDTOALERTTHEDRIVERTODIAGNOSETHEPROBLEM,ATECHNICIANJUMPSTHETERMINALSONTHESERVICECHECKCONNECTORANDREADSOUTTHETROUBLECODES3CLICKHERETOSEEABIGGERELECTRICPOWERSTEERINGSYSTEMSPROMISEWEIGHTREDUCTION,FUELSAVINGSANDPACKAGEFLEXIBILITY,ATNOCOSTPENALTYEUROPESHIGHFUELPRICESANDSMALLERVEHICLESMAKEAFERTILETESTBEDFORELECTRICSTEERING,ATECHNOLOGYTHATPROMISESAUTOMAKERSWEIGHTSAVINGSANDFUELECONOMYGAINSANDINASHORTTIME,ELECTRICSTEERINGWILLMAKEITTOTHEUS,TOOITSJUSTJUSTAMATTEROFTIME,SAYSALYBADAWY,DIRECTOROFRESEARCHANDDEVELOPMENTFORDELPHISAGINAWSTEERINGSYSTEMSINSAGINAW,MICHTHEISSUEWASCOSTANDTHATSBEHINDUSNOWBY2002HEREINTHEUSTHECOSTOFELECTRICPOWERSTEERINGWILLABSOLUTELYBEAWASHOVERHYDRAULICTODAY,ELECTRICANDHYBRIDPOWEREDVEHICLESEV,INCLUDINGTOYOTASPRIUSANDGMSEV1,ARETHEPERFECTDOMAINFORELECTRICSTEERINGBUTBY2010,ATRWINCINTERNALSTUDYESTIMATESTHATONEOUTOFEVERYTHREECARSPRODUCEDINTHEWORLDWILLBEEQUIPPEDWITHSOMEFORMOFELECTRICALLYASSISTEDSTEERINGTHECLEVELANDBASEDSUPPLIERCLAIMSITSNEWSTEERINGSYSTEMSCOULDIMPROVEFUELECONOMYBYUPTO2MPG,WHILEENHANCINGHANDLINGTHEREARETRUEBOTTOMLINEBENEFITSASWELLFORAUTOMAKERSBYREDUCINGOVERALLCOSTSANDDECREASINGASSEMBLYTIME,SINCETHERESNONEEDFORPUMPS,HOSESANDFLUIDSANOTHERCLAIMEDADVANTAGEISSHORTENEDDEVELOPMENTTIMEFORINSTANCE,ADELPHIGROUPDEVELOPEDETUNE,ARIDEANDHANDLINGSOFTWAREPACKAGETHATCANBERUNOFFALAPTOPCOMPUTERTHEYCANTAKETHATCOMPUTERANDPLUGITIN,ATTACHITTOTHECONTROLLERANDCHANGEALLTHEHANDLINGPARAMETERSEFFORTLEVEL,RETURNABILITY,DAMPINGONTHEFLY,BADAWYSAYSITUSEDTOTAKEMONTHSDELPHIHASONEOEMCUSTOMERTHATSHOULDSTARTLOWVOLUMEPRODUCTIONIN99ELECTRICSTEERINGUNITSARENORMALLYPLACEDINONEOFTHREEPOSITIONSCOLUMNDRIVE,PINIONDRIVEANDRACKDRIVEWHICHSYSTEMWILLBECOMETHENORMISSTILLUNCLEARSHORTTERM,OEMSWILLCHOOSETHESTEERINGSYSTEMTHATISEASIESTTOINTEGRATEINTOANEXISTINGPLATFORMOBVIOUSLY,4GREATERPOTENTIALCOMESFROMDESIGNINGTHESYSTEMINTOANALLNEWPLATFORMWEHAVEALLTHREEDESIGNSUNDERCONSIDERATION,SAYSDRHERMANSTRECKER,GROUPVICEPRESIDENTOFSTEERINGSYSTEMSDIVISIONATZFINSCHWAEBISCHGMUEND,GERMANYITSUPTOTHEMARKETANDOEMSWHICHVERSIONFINALLYWILLBEUSEDANDMANUFACTUREDTHELARGEMANUFACTURERSHAVEALLGRABBEDHOLDOFWH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