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Interface Design Vehicle Busses

Interface Design Vehicle Busses

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Interface Design Vehicle Busses

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  1. Interface DesignVehicle Busses Omid Fatemi

  2. Outline

  3. Busses • Computer buses • Peripheral buses • Instrumentation buses • Vehicle buses

  4. Vehicle Buses? • Why buses in vehicles? • Number of electronic equipments is increasing heavily in vehicles (expensive wiring) • Modern vehicles control system needs a lot of information from sensors • Easier fault diagnostic (tester can be connected to a single plug)

  5. Wire Length

  6. WhyMultiplex Wiring?

  7. Classification

  8. General Characteristics • Typically short buses (no hierarchy) • Open topology to provide easy addition of new modules and removing of old modules • Broadcast type of transmission is typically used • (messages are sent to bus to be available for everybody) • Immune for high noise • (temperature area -40 C to +125 C) • Cheap price

  9. Protocol For Vehicle Buses • CAN (Controller Area Network) • most European vehicle • both classB & classC • LIN (Local Area Network) • all vehicles in future • classA • VAN (Vehicle Area Network) • French vehicles (Renault, …) • both classB & classC

  10. Protocol For Vehicle Buses (Con) • ABUS • VW • D2B () • Mercedes • classD • TTP(Time Trigger Protocol)

  11. CAN Protocol

  12. Basic properties • Fast (up to 1Mbps) • Prioritization • Configuration flexibility • Multi master • Multicast • Powerful error detection

  13. CAN in passenger car

  14. CAN Implementation

  15. CAN node

  16. CANPhysical layer

  17. Network setup

  18. Twisted pair

  19. EMI interference

  20. CAN Connector 1. nc 2. CAN L 3. CAN GND 4. nc 5. CAN-shield 6. GND 7. CAN H 8. nc 9. CAN V+

  21. CANData link layer

  22. Broadcast communication

  23. Wired-and Mechanism

  24. Collision resolution • bitwise arbitration • CSMA/CD (carrier sense multiple access / collision detection)

  25. Arbitration

  26. Data rate • 1 Mbps for bus length of up to 40m. • 500 Kbps for bus length of up to 100m. • 250 Kbps for bus length of up to 200m. • 125 Kbps for bus length of up to 500m