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Welcome to Truck – Trailer Wireless Connection, a master’s thesis presentation

Welcome to Truck – Trailer Wireless Connection, a master’s thesis presentation. People involved. Lecturer : Mikael Gunnarsson Examiner: Prof. Gerald Q. Maguire Jr. Adviser : Mattias Sjögren Opponent: Mats Sandberg. This presentation…. Scania Infotronics AB Control Area Networks

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Welcome to Truck – Trailer Wireless Connection, a master’s thesis presentation

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  1. Welcome to Truck – Trailer Wireless Connection,a master’s thesis presentation

  2. People involved • Lecturer: Mikael Gunnarsson • Examiner: Prof. Gerald Q. Maguire Jr. • Adviser: Mattias Sjögren • Opponent: Mats Sandberg

  3. This presentation… • Scania Infotronics AB • Control Area Networks • Project goal • Technologies (DECT, Bluetooth) • Prototype • Conclusions & future work • Questions & discussion

  4. Scania Infotronics AB • Subsidiary of Scania AB • Provides IT- solutions for heavy vehicles, e.g. the truck industry • Located in Kista & founded in April 1999 • Develops fleet management systems

  5. Control Area Network”CAN”

  6. Control Area Network, CAN • Standard for serial data communication. • Differential transmission on a twistedpair wire. • ISO11992 & J1939 (differs in data transfer rate and voltage levels)

  7. CAN message format • Three major parts: ID, DLC, and data. • CAN messages contains no dest. address. • Source address is encapsulated in the ID. • 8 bytes of data per message (max).

  8. CAN gateways and the ID field • A CAN gateway changes the source ID to one that represents the vehicle from which it originated. • Cyclic message informs about location.

  9. Wireless link nodes Handheld Computer CAN - SAE J1939 CAN - ISO 11992 or SAE J1939 Project goal/ problem statement ? • How to extend the CAN-bus into the trailer's ? • Which wireless technology to use ? • How to combine the chosen wireless technology& the CAN protocol ?

  10. Problem Statement • A wireless gateway that can be placed anywhere in a road train. • Should be “stand alone”. • Possible a serial link in parallel to CAN

  11. DECTor BlueTooth ?

  12. DECT & BlueTooth • They are both wireless technologies supporting data and voice transfer. • European standards • Data transfer rates ~300 – 700 kbps • Built to deal with interference

  13. 1880 –1900 Mhz 2.45Mhz in North America. Data transfer rate: 552kb/s in one direction or 288kb/s bidirectional 2.45Mhz Spain, France, and Japan have narrower bandwidth. Data transfer rate: 723kb/s in one direction or 433kb/s bidirectional DECT BlueTooth

  14. Interference avoidance: DECT • 240 channels (10 carrier frequences * 24 timeslots in a frame) • Continously checking the signal strength and switch channel if a better is found.

  15. Interference avoidance: BlueTooth • 79 carrier frequences (23 in Spain, France, and Japan). • A frecuency hopping sequence is pseudorandomly calculated upon the master’s internal clock. • Changes channel 1600 times per sec.

  16. In DECT the devices are called ”fixed parts”, FP or ”portable parts”, PP. They have seperate rols in a connection. The fixed part contains a list of portable parts that are allowed to connect. In BlueTooth, all devices are identical ie. all devices can become master och slave in a connection. It is possible to ask an anounymous device for its address over the air. Networking

  17. DECTor BlueTooth?

  18. Prototype development

  19. Prototype development • Provides forwarding of Can messages. • The gateway automatically adjusts to the location in a road train. • SourceID is changed according to ISO11992. • Provides a RS232 serial interface in parallel to the CAN bus. • Connections are made and terminated via Can messages. • Software written i ANSI C.

  20. Prototype development Connection establishment:

  21. Forwarding CAN messages From CAN : Through Bt-link:

  22. Future Work • Hardware • Bluetooth Product Qualification • Standards

  23. Discussion !

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