CAN 协议 毕业论文外文翻译

《CAN 协议 毕业论文外文翻译》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

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.Principlesofd

2、ataexchangeCANisbasedonthe“broadcastcommunicationmechanism”,whichisbasedonamessage-orientedtransmissionprotocol.Itdefinesmessagecontentsratherthanstationsandstationaddresses.Everymessagehasamessageidentifier,whichisuniquewithinthewholenetworksinceitdefines

3、contentandalsothepriorityofthemessage.Thisisimportantwhenseveralstationscompeteforbusaccess(busarbitration).Asaresultofthecontent-orientedaddressingschemeahighdegreeofsystemandconfigurationflexibilityisachieved.ItiseasytoaddstationstoanexistingCANnetworkwi

4、thoutmakinganyhardwareorsoftwaremodificationstothepresentstationsaslongasthenewstationsarepurelyreceivers.Thisallowsforamodularconceptandalsopermitsthereceptionofmultipledataandthesynchronizationofdistributedprocesses.Also,datatransmissionisnotbasedontheav

5、ailabilityofspecifictypesofstations,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-timedatatransmissionInreal-timeprocessingtheurgencyofmessagestobeexchangedoverthenetworkcandiffergreatly:arapidlychangingdimension

6、,e.g.engineload,hastobetransmittedmorefrequentlyandthereforewithlessdelaysthanotherdimensions,e.g.enginetemperature.Thepriority,atwhichamessageistransmittedcomparedtoanotherlessurgentmessage,isspecifiedbytheidentifierofeachmessage.Theprioritiesarelaiddownd

7、uringsystemdesignintheformofcorrespondingbinaryvaluesandcannotbechangeddynamically.Theidentifierwiththelowestbinarynumberhasthehighestpriority.Busaccessconflictsareresolvedbybit-wisearbitrationoftheidentifiersinvolvedbyeachstationobservingthebuslevelbitfor

8、bit.Thishappensinaccordancewiththewired-and-mechanism,bywhichthedominantstateoverwritestherecessivestate.Allthosestations(nodes)withrecessivetransmissionanddominantobservationlosethecompetitionforbusaccess.Al