1. Multiplexing NACAT 2005 Sean Bennett Centennial College Toronto

2. Definitions: Transmitting of digital signals between electronic components Transmitting of digital signals between electronic components In-vehicle networking In-vehicle networking Sharing of system hardware Sharing of system hardware Reduction in system hardware Reduction in system hardware Message Identifiers - MIDs Message Identifiers - MIDs

3. Historical Perspective Used by U.S. Military since 1970s MIL-STD-1553 Class A Serial bus 1980s: most auto OEMs: at least 1 bus 1980s: truck OEMs using proprietary bus 1990s: truck OEMs using full network serial bus

4. Historical perspective cont. Automobile OEMs slower to adopt bus networks because: Automobile OEMs slower to adopt bus networks because: –Not cost effective: eliminates some wires but: –Replaces them with protocol handling circuits –Increases competition: in U.S. limited number of ECM suppliers compared with EU & Asia –Concerns over non-proprietary access to vehicle network

5. Truck, transit bus, & HE OEMs Reduction of wiring harness mass Reduction of wiring harness mass Networking of parametric hardware: TPS Networking of parametric hardware: TPS Increased flexibility of subsystem options Increased flexibility of subsystem options Reduced factory line assembly costs Reduced factory line assembly costs Telemetric access to data bus Telemetric access to data bus Ability to synergize MID operation: Ability to synergize MID operation: – example: engine/ trans/ ABS/ATC/ CWS

6. Multiplexing Standardization Power line carrier Power line carrier J1587/1708 J1587/1708 CAN 2.0 architecture: Intel and Bosch CAN 2.0 architecture: Intel and Bosch J1850 automotive J1850 automotive J1939 heavy-equipment on/off highway J1939 heavy-equipment on/off highway Lockheed Martin aircraft – transit bus Lockheed Martin aircraft – transit bus

7. J1939 and J1850 data bus CAN 2.0 platform – serial bus CAN 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/s Speed window: 125 Kb/s up to 1 Mb/s Actual example: V-MAC III module to EUP module = 500 Kb/s Actual example: V-MAC III module to EUP module = 500 Kb/s High transfer rates = mean that ‘real time’ responses are met High transfer rates = mean that ‘real time’ responses are met

8. MID requirements MID is any controller networked to the bus MID is any controller networked to the bus Clock speed rated in MHz Clock speed rated in MHz 1 MHz = 1 million bit decisions per second 1 MHz = 1 million bit decisions per second J1939 MID clock speeds must be min 16 MHz J1939 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 MHz –Cat ADEM 2000 clock speed = 32 MHz

9. Non-serial bus topology Fuel Injection ECM Transmission ECM ABS/ATC ECM Engine ECM Chassis Management ECM Collision Warning ECM Dash Display ECM

10. Serial bus topology Engine ECM Transmission ECU Chassis Management ECM Instrument Cluster Unit (ICU) ABS/ATC Module Twisted Wire Pair Yellow: CAN High + Green: CAN Low -

11. J1939 network MIDs Engine controller – fuel injection controller Engine controller – fuel injection controller Bulkhead (BHM)/Chassis (CHM)/Dash ICU Bulkhead (BHM)/Chassis (CHM)/Dash ICU CWS VORAD – Night vision Infrared CWS VORAD – Night vision Infrared Transmission Transmission ABS/ ATC/ RPE/ Directional stability ABS/ ATC/ RPE/ Directional stability Climate control Climate control Telemetry: GPS and Satellite 2-way Telemetry: GPS and Satellite 2-way

12. Data packet architecture

13. FET used as ‘relay’ in MPlx circuit

14. J1939 data bus connectors

15. FTL-M2 Module location

16. Acknowledgements Freightliner Service Training Freightliner Service Training Pat Leitner - Freightliner MB, New Jersey Pat Leitner - Freightliner MB, New Jersey Joe Bell - Navistar International, Chicago Joe Bell - Navistar International, Chicago Chris Lupini – SAE - Delphi Delco Chris Lupini – SAE - Delphi Delco Artwork from Heavy Duty Truck Systems, 4 th Edition Delmar Thomson, pub: 12/05 Artwork from Heavy Duty Truck Systems, 4 th Edition Delmar Thomson, pub: 12/05

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