SAE 840069 中间位置操纵性评价4444444

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1、SAE840069ObjectiveEvaluationofOn-CenterHandlingPerformance中间位置操纵性评价目标ABSTRACTAtestwasdevelopedtoquantifyautomobilehandlingcharacteristicsfortheperformanceregionencounteredinfreewaydriving.Steeringwheelangleandtorque,vehiclespeedandyawratearerecordedduringalowfrequencysinusoidalsteermaneuver.Th

2、edataisreducedtosteeringhysteresis,on-centerandoff-centersteeringsensitivitiesandtorquegradients,andasteeringworkparameter.Thispaperdescribesthetestprocedureandparameters.Testresultsarepresentedcomparingthegeneralattributesofforeignversusdomesticcars,manualversuspowersteering,andrearversusfron

3、twheeldrive.Thestudyofdriverautomobileinteractionduringsteeringmaneuvershasbeenwidelyaddressedinthetechnicalliterature.However,itremainsanareaofvehiclehandlingwherethereismuchtobelearned.The“roadfeel”ofautomobilesinthelowlateralaccelerationor“on-center”regionisofparticularinterestinevaluatingh

4、andlingforhighwaydriving.Optimizationofsteeringcharacteristicsforeasiercontrollabilityanddrivingcomfortwasstudiedatleastasearlyas1964whenSegelexaminedtheeffectofvaryingsteeringtorquegradient()ondrivers’perceptionoftheeaseandprecisionofdriving(1)*.Hefounddriverspreferredasteeringtorquegradiento

5、f23N.m/gtosteeringtorquegradientsof6.4or41N.m/ginlanechangeand0.2gsteadystateturningtasks.Inhispaper,Segelexplainedthatdrivingsituationsdemandingprecisepathcontrolrequirethedrivertobemoreattentivetovehicleresponse.Thisattentivenessisthegainoftheresponse-feedbackloopinSegel’sdriver-vehiclecontr

6、olsystemblockdiagram.*NumbersinparenthesesdesignatereferencesatendofpaperThemoreattentionneeded,the"tightertheloop".Whenlessattentionisneeded,thedrivingstrategytendstoward"open-loop"control.Segelpostulatedthatadriverreliesmoreonsteeringwheelforcecuesthansteeringwheelangleasdrivingstrategytends

7、toward"open-loop"control.Thehighwaydrivingtaskisprimarilycarriedoutatlowlevelsoflateralaccelerationandispredominantlylowstress,"open-loop"drivingasdescribedbySegel.Therefore,atesttomeasureon-centerhandlingperformancemustincludethemeasur