Multiplexing NACAT Multiplexing NACAT 2005 2005 Sean Bennett Sean Bennett Centennial College Centennial College Toronto Toronto
Dec 17, 2015
Multiplexing NACAT 2005Multiplexing NACAT 2005
Sean BennettSean Bennett
Centennial CollegeCentennial College
TorontoToronto
Definitions:Definitions:
• Transmitting of digital signals Transmitting of digital signals between electronic componentsbetween electronic components
• In-vehicle networkingIn-vehicle networking
• Sharing of system hardwareSharing of system hardware
• Reduction in system hardwareReduction in system hardware
• Message Identifiers - MIDsMessage Identifiers - MIDs
Historical PerspectiveHistorical Perspective
• Used by U.S. Military since 1970sUsed by U.S. Military since 1970s
• MIL-STD-1553 Class A Serial busMIL-STD-1553 Class A Serial bus
• 1980s: most auto OEMs: at least 1 1980s: most auto OEMs: at least 1 busbus
• 1980s: truck OEMs using proprietary 1980s: truck OEMs using proprietary busbus
• 1990s: truck OEMs using full network 1990s: truck OEMs using full network serial busserial bus
Historical perspective cont.Historical perspective cont.
• Automobile OEMs slower to adopt bus Automobile OEMs slower to adopt bus networks because: networks because: – Not cost effective: eliminates some wires but:Not cost effective: eliminates some wires but:– Replaces them with protocol handling circuitsReplaces them with protocol handling circuits– Increases competition: in U.S. limited number Increases competition: in U.S. limited number
of ECM suppliers compared with EU & Asiaof ECM suppliers compared with EU & Asia– Concerns over non-proprietary access to Concerns over non-proprietary access to
vehicle networkvehicle network
Truck, transit bus, & HE OEMs Truck, transit bus, & HE OEMs
• Reduction of wiring harness massReduction of wiring harness mass
• Networking of parametric hardware: TPSNetworking of parametric hardware: TPS
• Increased flexibility of subsystem optionsIncreased flexibility of subsystem options
• Reduced factory line assembly costsReduced factory line assembly costs
• Telemetric access to data busTelemetric access to data bus
• Ability to synergize MID operation:Ability to synergize MID operation:– example: engine/ trans/ ABS/ATC/ CWSexample: engine/ trans/ ABS/ATC/ CWS
Multiplexing StandardizationMultiplexing Standardization
• Power line carrierPower line carrier
• J1587/1708 J1587/1708
• CAN 2.0 architecture: Intel and BoschCAN 2.0 architecture: Intel and Bosch
• J1850 automotiveJ1850 automotive
• J1939 heavy-equipment on/off J1939 heavy-equipment on/off highwayhighway
• Lockheed Martin aircraft – transit busLockheed Martin aircraft – transit bus
J1939 and J1850 data busJ1939 and J1850 data bus
• CAN 2.0 platform – serial busCAN 2.0 platform – serial bus
• Class C bus (relates to transaction speeds)Class C bus (relates to transaction speeds)
• Speed rated in K/bits per second (b/s)Speed rated in K/bits per second (b/s)
• Speed window: 125 Kb/s up to 1 Mb/sSpeed window: 125 Kb/s up to 1 Mb/s
• Actual example: V-MAC III module to EUP Actual example: V-MAC III module to EUP module = 500 Kb/smodule = 500 Kb/s
• High transfer rates = mean that ‘real High transfer rates = mean that ‘real time’ responses are mettime’ responses are met
MID requirementsMID requirements
• MID is any controller networked to the busMID is any controller networked to the bus
• Clock speed rated in MHzClock speed rated in MHz
• 1 MHz = 1 million bit decisions per second1 MHz = 1 million bit decisions per second
• J1939 MID clock speeds must be min 16 MHzJ1939 MID clock speeds must be min 16 MHz
• Engine controller clock speeds higher:Engine controller clock speeds higher:– FTL-MB 900 module clock speed = 24 MHzFTL-MB 900 module clock speed = 24 MHz– Cat ADEM 2000 clock speed = 32 MHzCat ADEM 2000 clock speed = 32 MHz
Non-serial bus topologyNon-serial bus topology
Fuel Injection ECM
Transmission ECM
ABS/ATCECM
Engine ECM
Chassis Management
ECM
Collision Warning
ECM
Dash DisplayECM
Serial bus topologySerial bus topology
EngineECM
TransmissionECU
Chassis Management
ECM
Instrument Cluster
Unit (ICU)
ABS/ATCModule
Twisted Wire PairTwisted Wire PairYellow: CAN High +Yellow: CAN High +Green: CAN Low -Green: CAN Low -
J1939 network MIDsJ1939 network MIDs
• Engine controller – fuel injection controllerEngine controller – fuel injection controller
• Bulkhead (BHM)/Chassis (CHM)/Dash ICUBulkhead (BHM)/Chassis (CHM)/Dash ICU
• CWS VORAD – Night vision InfraredCWS VORAD – Night vision Infrared
• Transmission Transmission
• ABS/ ATC/ RPE/ Directional stability ABS/ ATC/ RPE/ Directional stability
• Climate controlClimate control
• Telemetry: GPS and Satellite 2-wayTelemetry: GPS and Satellite 2-way
AcknowledgementsAcknowledgements
• Freightliner Service TrainingFreightliner Service Training
• Pat Leitner - Freightliner MB, New JerseyPat Leitner - Freightliner MB, New Jersey
• Joe Bell - Navistar International, Chicago Joe Bell - Navistar International, Chicago
• Chris Lupini – SAE - Delphi DelcoChris Lupini – SAE - Delphi Delco
• Artwork from Heavy Duty Truck Systems, Artwork from Heavy Duty Truck Systems, 44thth Edition Delmar Thomson, pub: 12/05 Edition Delmar Thomson, pub: 12/05
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