can 协议 毕业论文外文翻译

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1、山东科技大学学士学位论文文献翻译附录二文献翻译CANprotocolM.J.SchofieldTheCANprotocolisaninternationalstandarddefinedintheISO11898.BesidetheCANprotocolitselftheconformancetestfortheCANprotocolisdefinedintheISO16845,whichguaranteestheinterchangeabilityoftheCANchips.1.PrinciplesofdataexchangeCANisbasedonthe“broadcas

2、tcommunicationmechanism”,whichisbasedonamessage-orientedtransmissionprotocol.Itdefinesmessagecontentsratherthanstationsandstationaddresses.Everymessagehasamessageidentifier,whichisuniquewithinthewholenetworksinceitdefinescontentandalsothepriorityofthemessage.Thisisimportantwhenseveralstatio

3、nscompeteforbusaccess(busarbitration).Asaresultofthecontent-orientedaddressingschemeahighdegreeofsystemandconfigurationflexibilityisachieved.ItiseasytoaddstationstoanexistingCANnetworkwithoutmakinganyhardwareorsoftwaremodificationstothepresentstationsaslongasthenewstationsarepurelyreceivers

4、.Thisallowsforamodularconceptandalsopermitsthereceptionofmultipledataandthesynchronizationofdistributedprocesses.Also,datatransmissionisnotbasedontheavailabilityofspecifictypesofstations,whichallowssimpleservicingandupgradingofthe山东科技大学学士学位论文文献翻译network.山东科技大学学士学位论文文献翻译2.Real-timedatatransm

5、issionInreal-timeprocessingtheurgencyofmessagestobeexchangedoverthenetworkcandiffergreatly:arapidlychangingdimension,e.g.engineload,hastobetransmittedmorefrequentlyandthereforewithlessdelaysthanotherdimensions,e.g.enginetemperature.Thepriority,atwhichamessageistransmittedcomparedtoanotherle

6、ssurgentmessage,isspecifiedbytheidentifierofeachmessage.Theprioritiesarelaiddownduringsystemdesignintheformofcorrespondingbinaryvaluesandcannotbechangeddynamically.Theidentifierwiththelowestbinarynumberhasthehighestpriority.Busaccessconflictsareresolvedbybit-wisearbitrationoftheidentifiersi

7、nvolvedbyeachstationobservingthebuslevelbitforbit.Thishappensinaccordancewiththewired-and-mechanism,bywhichthedominantstateoverwritestherecessivestate.Allthosestations(nodes)withrecessivetransmissionanddominantobservationlosethecompetitionforbusaccess.Al