汽车电子控制技术(Bilingual 1114).ppt

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1、TheautomobileelectronicscontroltechniqueSoutheastUniversityMechanicalDepartmentFengChong-Yi8/24/20211Reviewingthecontentforpreviouslessen(12/08/2010):The8thchapter:Thebrakesystem8.1briefintroductionoftheBrakesystem8.2Anti-lockBrakeSystem(ABS)8.3Criteriaofcon

2、trolquality8.4ABSVersions8.5TheABSfunctionsexpandThecontentsfortoday(12/15/2011)8/24/202128.5TheABSfunctionsexpand8.5.1TheASRsystem8.5.2TheESPsystem8/24/202138.5.1TheASRsystem(SeealsoP171)ThebasicprincipleoftheASRTraction-controlsystemsforpassengercars.8/24/

3、20214ThebasicprincipleoftheASRTheAccelerationSlipRegulation(ASR).Duringstanding-startandmovingaccelerationandunderbraking,theefficiencywithwhichforcescanbetransferredtotheroaddependsuponthetractionavailablebetweentiresandroadsurface.Theadhesion/slipcurvesfor

4、accelerationandbrakingdisplaythesamebasicpatternaseachother.8/24/202158/24/20216Adhesion/slipcurves8/24/20217Adhesion/slipcurvesμA,μB—Coefficientofadhesionunderacceleration/braking;λA,λB—Torqueunderacceleration/braking;μS—Lateral-forcecoefficient;Drynessasph

5、alt;Hardpackedsnow;Concrete;Wetasphalt.8/24/20218Traction-controlsystemsforpassengercars.Toprovideoptimalclosed-loopcontroloftorqueatthedrivewheels,themechanicalconnectionbetweenacceleratorpedalandthrottlevalve(orpedalandinjection-pumpcontrolleverondieseleng

6、ines)isreplacedbytheETC(EngineTorqueControl)electronicthrottlecontrol(electronic"drive-by-wire"acceleratororEGAS).8/24/20219Asensorconvertsthepositionoftheacceleratorpedalintoanelectricalsignal,whichtheECUthenusestogenerateacontrolinstruction.Aservomotorresp

7、ondstothissignalbyrepositioningthethrottlevalve(orinjection-pumpcontrolleverondiesels);itthentransmitsapositionreportbacktotheECU.Brief,simultaneousactivationoftheservicebrakesisemployedtosupplementtheASRfunction(improvedtractiveperformancevialimited-slipeff

8、ect).8/24/202110Electronicengine-powercontrolforETC(EngineTorqueControl)ABS/ASRcontrolunit,ETCcontrolunit,Acceleratorpedal,Servomotor,Throttlevalve,orDieselinjectionpump.8/24/202111ThestandardAB