1 / 23

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

chibale
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 !

More Related