research on control strategy of vehicle electric power steering system

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1、Researchoncontrolstrategyofvehicleelectricpowersteeringsystem　　Abstract：Thestructureandworkingprincipleofsteeringcolumn-powertypeelectricpowersteering（EPS）systemwereintroduced.ThecontrolstrategyandassistcharacteristicsofEPSsystemweredesigned.Torquecontrolstrategyofpowersteeringmotorwasdesignedbased

2、ontheresearchofstructureandcontrolmethod.PowersteeringtestswerecompletedintheEPSsystemtestbench.Thetestresultsshowedthatthedesignedcontrolstrategyiseffective.　　Keywords：electricpowersteering（EPS）；controlstrategy；assistcharacteristics；steeringtest.　　Introduction　　Electricpowersteeringsystem（EPS）isan

3、ewtypeofautomobilepowersteeringsystemwhichhasmanyadvantagessuchassavingenergy，environmentprotectionandassistcharacteristic，etc.TheresearchaboutEPSsystemismainlyfocusedontheselectionoftheboostermotor，theoptimizationdesignofcontrollerandcontrolstrategies[1，2].　　Whenthedriveroperatesthesteeringwheel，t

4、hesensorsdetect8avarietyofsignalssuchassteeringtorquesignal，vehiclespeedsignal，enginespeedsignalprocessingandothertypesofsignalsandsendittotheECU.BasedontherespectivesignalssendingtotheECUinwhichtheworkingconditionsofvehiclecanbedetermined，power-assistedwascontrolledthroughthetorquesignals，roadfeel

5、ingwascontrolledbythespeedsignal，thenpower-assistedmotoroutputthetorqueoftheworkingconditions，thereductionmechanismreducespeedandincreasetorque，thenamplifiedthetorqueagainonarackandpinionsteeringgeartoachievethepower-assistedsteeringrole.Whenthetorqueofsteeringwheelamplifies，themotorincreasestorque

6、toensuretheportabilityofsteering.Athigherspeeds，thetorqueisreducedinordertoobtainabetterroadfeel[3，4].　　Systemoverallcontrolstrategy　　TheEPSsystemisbasedonthetraditionalmechanicalsteeringsystemandincreasedoftheelectroniccontrolsystem.ElectroniccontrolunitofEPSsystemisbasedonthepowerofthemotortorque

7、.Therefore，thecontrolstrategyofEPSsystemcanbedividedintotwolayers[5]，theupperlayerisdecision-makingcontrol，thelowerlayerisexecutioncontrol.TheoperationmodeofEPSsystemcanbedividedintotheassistcontrolmode，the