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CAN总线动态调度算法改进研究.docx

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CAN总线动态调度算法改进研究 Abstract Inrecentyears,theapplicationofControllerAreaNetwork(CAN)busindistributedcontrolsystemshasbeenincreasingrapidly.Toensurethereliabilityandefficiencyofthesystem,thedynamicschedulingalgorithmplaysacrucialroleinthereal-timeschedulingoftasks.Inthispaper,animproveddynamicschedulingalgorithmbasedonCANbusisproposed.Thealgorithmfirstlyassignsprioritiestotasksbasedontheirreal-timerequirements,thenadjuststheprioritieswiththecurrentloadofthesystem,andfinallyallocatesbandwidthtoeachtaskaccordingtotheirprioritiesanddatatransmissionfrequency,thusachievingabetterbalancebetweenreal-timeperformanceandbandwidthutilization.Simulationexperimentsareperformedtoverifytheeffectivenessoftheproposedalgorithm. Keywords:ControllerAreaNetwork(CAN),dynamicschedulingalgorithm,real-timescheduling,taskpriority,bandwidthallocation. Introduction ControllerAreaNetwork(CAN)busisapopularcommunicationprotocolwidelyusedindistributedcontrolsystemsinvariousindustries,suchasautomotive,aerospace,andindustrialcontrolsystems.Asamulti-master,message-basedcommunicationprotocol,CANbusprovidesadvantagessuchashighreliability,lowcost,andflexiblestructure.However,inthepracticalapplicationofdistributedcontrolsystems,thereareoftenmultipletaskstobeexecutedinreal-time,suchasdataacquisition,controlcalculation,andfeedbackcontrol,whichrequiresanefficientandreliableschedulingalgorithmtoensurethereal-timeperformanceandoverallsystemefficiency. Dynamicschedulingalgorithmisasignificantapproachtorealizereal-timetaskschedulinginadistributedcontrolsystem.Thedynamicschedulingalgorithmcanadjusttheprioritiesoftasksandallocatebandwidthdynamically,orevenchangethereal-timerequirementsoftasksadaptivelyaccordingtothechangesinthesystemloadtooptimizetheutilizationofsystemresources.TherearevariousdynamicschedulingalgorithmsproposedfortheCANbus,includingTDMA-basedscheduling,priority-basedscheduling,andvariablebandwidthallocationscheduling.However,thesealgorithmshavesomelimitations,suchaslowreal-timeperformance,lowbandwidt