CAN (Controller Area Network)
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This document discusses Controller Area Network (CAN) communication technology used in automobiles. It begins by motivating the need for electronic communication between vehicle components to enhance features. It then introduces CAN, which uses a serial bus to connect electronic control units. The presentation covers CAN framing, bus access, prioritization of messages, and data protection methods like error detection checks, bit stuffing, and error confinement states. The goal is to reliably transmit data between nodes in a CAN network.
CAN (Controller Area Network)
- 1. Mercedes-BenzResearchandDevelopmentIndia Mercedes-Benz Research andDevelopment India Controller Area Network (CAN) SUKRUTHRAMESH BABU,EE, MBRDI EmbassyCrest, Banglaore,14-August-2015
- 2. Mercedes-BenzResearchandDevelopmentIndia Contents 1. Motivation 2. Introduction 3. CAN communication 4. CAN framing 5. CAN busaccess 6. CAN dataprotection 9/10/2015CAN Presentation| Sukruth Ramesh Babu
- 3. Mercedes-BenzResearchandDevelopmentIndia Motivation…. Intensive electronics Creatingcommunicationbetweenelectronic unitswouldenhanceautomobilefeaturescompletely. Engine Chassis Music System Brakes Lighting System Battery Sensors oors Windows Gauges Climate Control eters Engine Body Chassis Music System Brakes Lighting System Battery Sensors Doors Windows Gauges Climate Control Meters 9/10/2015CAN Presentation| Sukruth Ramesh Babu
- 5. Mercedes-BenzResearchandDevelopmentIndia Introduction CAN (Controller Area Network) is a serial communication technology used especially for reliable data exchange between electronic controlunits(ECUs) in theautomobile. OriginallyintroducedbyBoschin 1983. PointtoPointwiringisbeing replaced byoneserial busconnecting all controlsystems. StandardizedbyISOandSAE. 9/10/2015CAN Presentation| Sukruth Ramesh Babu
- 6. Mercedes-BenzResearchandDevelopmentIndia CAN communication Basicconcepts 9/10/2015CAN Presentation| Sukruth Ramesh Babu
- 7. Mercedes-BenzResearchandDevelopmentIndia CAN network 9/10/2015CAN Presentation| Sukruth Ramesh Babu
- 8. Mercedes-BenzResearchandDevelopmentIndia CAN BUS COMMUNICATION PRINCIPLE DatathataretransmittedfromanyNode,containsMESSAGElabelledwithIDENTIFIER,which isuniquethroughoutthenetwork All other nodes receive the message and each performs an acceptance test on the identifier to determine if the message, and thus its content,isrelevant tothatparticularnode. Ifthemessage isrelevant, itwill beprocessed;otherwiseitisignored Allows integrationof additionalCANnodeswithoutrequiringmodificationof the CANnetwork. Themaximumnumberofnodesisnotspecified. Networksarelimited byelectricalloading,upto64 nodesisnormal 9/10/2015CAN Presentation| Sukruth Ramesh Babu
- 10. Mercedes-BenzResearchandDevelopmentIndia CAN bus logic 9/10/2015CAN Presentation| Sukruth Ramesh Babu
- 11. Mercedes-BenzResearchandDevelopmentIndia Vehicle Bus Protocol Protocol Abbreviation Nature CAN ControlledAreaNetwork an inexpensivelow-speedserialbus forinterconnectingautomotive components automotivecomponents D2B DomesticDigitalBus a high-speedmultimedia interface FlexRay - a generalpurposehigh-speedprotocolwithsafety-criticalfeatures features I²C Inter-IntegratedCircuit forattachinglow-speedperipherals KWP2000 KeywordProtocol2000 –a protocolfor automotivediagnosticdevices(runseitheronaseriallineoroverCAN) seriallineoroverCAN) LIN LocalInterconnectNetwork a verylowcostin-vehiclesub-network MOST Media OrientedSystemsTransport a high-speedmultimedia interface SPI SerialPeripheralInterface forcommunicationwithslowperipheraldevices,whichareaccessedinfrequently
- 12. Mercedes-BenzResearchandDevelopmentIndia CAN Bus characteristics Buslength / Bitratetradeoff 1Mbit/sec 40meters(131 feet) 500Kbit/sec 100meters(328 feet) 250K bit/sec 200meters(656 feet) 125K bit/sec 500meters(1640 feet) CAN Presentation| Sukruth Ramesh Babu 9/10/2015
- 13. Mercedes-BenzResearchandDevelopmentIndia CAN FRAMES Data Frame–Fortransmitting userdata Remote Frame–Used forrequesting 'data frame' from any other CAN node Error Frame–To indicate errors detected during communication Overload Frame-To introduce delay in the transmission CANFRAMETYPES 9/10/2015CAN Presentation| Sukruth Ramesh Babu
- 14. Mercedes-BenzResearchandDevelopmentIndia DATA FRAME CAN Presentation| Sukruth Ramesh Babu 9/10/2015
- 15. Mercedes-BenzResearchandDevelopmentIndia DATA FRAME (Standard format and Extended Format) CAN Presentation| Sukruth Ramesh Babu 9/10/2015
- 16. Mercedes-BenzResearchandDevelopmentIndia CAN Presentation| Sukruth Ramesh Babu • TheDLC(DataLengthCode)communicatesthenumberof payloadbytesto thereceivers 9/10/2015
- 17. Mercedes-BenzResearchandDevelopmentIndia REMOTE FRAME CAN Presentation| Sukruth Ramesh Babu 9/10/2015
- 18. Mercedes-BenzResearchandDevelopmentIndia Error Frame Types oferror: Therearefivetypesoferroraretherein CANandarelistedbelow.And in caseanyone oftheseerroris observed theerror frameis transmitted. Bit error Stufferror CRCerror Form error Acknowledgementerror CAN Presentation| Sukruth Ramesh Babu 9/10/2015
- 19. Mercedes-BenzResearchandDevelopmentIndia BUS ACCESS IN CAN NETWORK CAN Presentation| Sukruth Ramesh Babu 9/10/2015
- 20. Mercedes-BenzResearchandDevelopmentIndia CAN Presentation| Sukruth Ramesh Babu 9/10/2015
- 21. Mercedes-BenzResearchandDevelopmentIndia PRIORITIZATION OF CAN MESSAGES CAN Presentation| Sukruth Ramesh Babu 9/10/2015
- 22. Mercedes-BenzResearchandDevelopmentIndia CAN data protection Reliabledatatransmission. BecauseCANis alsousedin verytime andsafetycritical applicationswithinthe motorvehicle, requirementsfordataintegrity are extremelyhigh. CAN Presentation| Sukruth Ramesh Babu 9/10/2015
- 23. Mercedes-BenzResearchandDevelopmentIndia NRZ Coding 9/10/2015CAN Presentation| Sukruth Ramesh Babu
- 24. Mercedes-BenzResearchandDevelopmentIndia BIT STUFFING CAN Presentation| Sukruth Ramesh Babu 9/10/2015
- 25. Mercedes-BenzResearchandDevelopmentIndia Error detection: Bit monitoring : Compares the bit and the bus level ACK Check : Checks for the dominant bit Stuff Check : Detection of sixth consecutive bit Form Check : Compares the bit stream with message format Cyclic Redundancy Check: Compares the bit stream with the generator polynomial 9/10/2015CAN Presentation| Sukruth Ramesh Babu
- 26. Mercedes-BenzResearchandDevelopmentIndia Error Confinement and Error states: Active Passive Bus OFF REC/TEC > 127 REC/TEC < 128 TEC > 255 Reset or Configuration of 128x11 recessive bits REC: Receiver Error Counter TEC: Transmit Error Counter 9/10/2015CAN Presentation| Sukruth Ramesh Babu
- 27. Mercedes-BenzResearchandDevelopmentIndia Thankyou!! CAN Presentation| Sukruth Ramesh Babu 9/10/2015