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Welcome to Truck

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Title: Welcome to the Truck Trailer Wireless Connection masters thesis presentation Author: Micke Gunnarsson Last modified by: Micke Gunnarsson – PowerPoint PPT presentation

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Title: Welcome to Truck


1
Welcome to Truck Trailer Wireless
Connection,a masters 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 NetworkCAN
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
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
DECT or 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
DECT BlueTooth
  • 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

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 masters internal clock.
  • Changes channel 1600 times per sec.

16
Networking
  • 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.

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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