Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Implementation of a Wireless Control System: Network Routing and Unreliable Communication Link Compensation
KTH, School of Electrical Engineering (EES), Automatic Control.
2012 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Wireless communication systems have been a part of everyday life for many decades but implemented in an industrial control system they are yet to make their big breakthrough. This is despite of the fact that wireless control systems show great promise in reducing installation costs and down time. The biggest reason why they have not already revolutionised the industry is reliability, as they are much more susceptible to delays and communication breakdowns compared to their wired counterpart.

The foundation for this thesis is the following scenario. In an industry a control loop uses a wireless link between the control computer and the actuator. A forklift moving heavy equipment happens to park in a position where it is blocking the communications. This thesis suggests a solution to this problem through the implementation of two separate measures. First a Collection Tree routing Protocol (CTP) is responsible for detecting broken links and nding a disturbance free path for the packet through the network. Secondly a Kalman lter based Predictive Outage Compensator (POC) estimates the missing data when the real control signal is delayed or missing.

In the implementation the Moteiv Tmote Sky was used for the network nodes and the double tank process as test bed for the POC. The results show that the CTP network is capable of routing the data through multiple hops without too much delay and that between 1 and 8 packets are lost during route changes. The POC performs on average 8% better than the more common and naive solution to simply hold the most recently received value in case of outage.

Place, publisher, year, edition, pages
2012. , 41 p.
Series
EES Examensarbete / Master Thesis, XR-EE-RT 2012:016
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Control Engineering
Identifiers
URN: urn:nbn:se:kth:diva-102679OAI: oai:DiVA.org:kth-102679DiVA: diva2:555779
Educational program
Master of Science in Engineering - Electrical Engineering
Uppsok
Technology
Examiners
Available from: 2012-09-26 Created: 2012-09-21 Last updated: 2012-09-26Bibliographically approved

Open Access in DiVA

XR-EE-RT 2012-016_Jakob Wallander(6273 kB)3578 downloads
File information
File name FULLTEXT01.pdfFile size 6273 kBChecksum SHA-512
1bdb214346fa13239ba55cfb9fb1be8dd3161f442dc414c0f9f0b1ecd00445d21a62a86d0c083d577df04ba688ddee1c65ab0a0886392deb33fb36296b73d3d1
Type fulltextMimetype application/pdf

By organisation
Automatic Control
Electrical Engineering, Electronic Engineering, Information EngineeringControl Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 3578 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 1241 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf