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Distributed System Control with FlexRay Nodes in Commercial Vehicles

Hoffstedt, Carl (2007) In MSc Theses
Department of Automatic Control
Abstract
Most vehicles today use some kind of hydraulic brake system in order to stop the vehicle. There are other techniques that will not only decrease the stop length, but also create a more stable vehicle; an example of such system is the Electromechanical braking system. The problem with such a system is that the requirements of data transmission and reliability are different from the system that is used today. To be able to implement such a system, a relatively new network protocol called FlexRay can be used. Different design alternatives will be introduced and one important subject is how the local nodes in the wheels can take over calculations, in a distributed way, from more central nodes. The best design was simulated using Matlab and a... (More)
Most vehicles today use some kind of hydraulic brake system in order to stop the vehicle. There are other techniques that will not only decrease the stop length, but also create a more stable vehicle; an example of such system is the Electromechanical braking system. The problem with such a system is that the requirements of data transmission and reliability are different from the system that is used today. To be able to implement such a system, a relatively new network protocol called FlexRay can be used. Different design alternatives will be introduced and one important subject is how the local nodes in the wheels can take over calculations, in a distributed way, from more central nodes. The best design was simulated using Matlab and a library called TrueTime to investigate if it is possible to implement such a system. The results from the simulation shows that it is possible to implement the system and that there is a lot of free space on the network for other tasks. An animation shows how the different nodes exchange redundancy responsibilities. One conclusion was that it is better to choose a simple design of the system instead of an advanced one where the nodes are connected to several networks to add redundancy. Once again the expression 'less is more' is valid! (Less)
Please use this url to cite or link to this publication:
author
Hoffstedt, Carl
supervisor
organization
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
FlexRay, distributed system control, safety and redundancy, real time
publication/series
MSc Theses
report number
TFRT-5805
ISSN
0280-5316
language
English
id
8847765
date added to LUP
2016-03-17 13:05:10
date last changed
2016-03-17 13:05:10
@misc{8847765,
  abstract     = {{Most vehicles today use some kind of hydraulic brake system in order to stop the vehicle. There are other techniques that will not only decrease the stop length, but also create a more stable vehicle; an example of such system is the Electromechanical braking system. The problem with such a system is that the requirements of data transmission and reliability are different from the system that is used today. To be able to implement such a system, a relatively new network protocol called FlexRay can be used. Different design alternatives will be introduced and one important subject is how the local nodes in the wheels can take over calculations, in a distributed way, from more central nodes. The best design was simulated using Matlab and a library called TrueTime to investigate if it is possible to implement such a system. The results from the simulation shows that it is possible to implement the system and that there is a lot of free space on the network for other tasks. An animation shows how the different nodes exchange redundancy responsibilities. One conclusion was that it is better to choose a simple design of the system instead of an advanced one where the nodes are connected to several networks to add redundancy. Once again the expression 'less is more' is valid!}},
  author       = {{Hoffstedt, Carl}},
  issn         = {{0280-5316}},
  language     = {{eng}},
  note         = {{Student Paper}},
  series       = {{MSc Theses}},
  title        = {{Distributed System Control with FlexRay Nodes in Commercial Vehicles}},
  year         = {{2007}},
}