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Ethernet in Automotive Networks – Design and evaluation of rate constrained Ethernet stack transporting J1939 messages.
KTH, School of Computer Science and Communication (CSC).
2011 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Ethernet as a backbone in automotive networks would to a great extent reduce the current bus load on the bandwidth limited CAN-bus. In the future more bandwidth is needed and new features require more bandwidth.

In this report, three real-time Ethernet protocols are analyzed (AFDX, TTEthernet and Ethernet AVB). As a result from the investigation a software stack is designed and implemented using the AFDX protocol.

The prototype is tested with sending and receiving simulated J1939 messages in two experiments. The first experiment uses accumulation of message frequencies to parameterize the virtual links. The second experiment encapsulates multiple messages in a single Ethernet packet. The primary results from the experiments were that encapsulation of multiple messages in a single Ethernet packet is more efficient

An advantage with the protocol is that it is possible to use with current smart Ethernet switches. An idea how the solution gradually could be introduced has been identified as future work. However, it is necessary to further investigate the electrical layer, electromagnetic compatibility and cabling. The conclusion for the degree project is that the protocol is suitable to use in future Ethernet applications.

Abstract [sv]

Ethernet som en stomme i fordonsnätverk skulle till stor del minska den nuvarande busslasten på den begränsade CAN-bussen. I framtiden kommer nya tillämpningar att kräva mer bandbredd.

Denna rapport analyserar tre stycken Ethernet-protokoll med realtidskrav (AFDX, TTEthernet och Ethernet AVB). Utifrån analysen har en mjukvarustack baserat på AFDX designats och implementerats.

Protokollstacken testas med att överföra simulerade J1939-meddelanden i två experiment. Det första experimentet använder frekvensackumulering för att parametersätta de virtuella länkarna. Det andra experimentet inkapslar flera J1939-meddelanden i ett Ethernet-paket. Resultatet från experimenten var att inkapsling av flera J1939-meddelanden i ett enskilt Ethernet-paket är den mest effektiva lösningen.

En fördel med detta protokoll är att det kan användas med befintliga smarta Ethernet-switchar. Ett förslag hur lösningen gradvis kan introduceras ges som framtida arbete. Det behövs dock en utredning om det fysiska lagret, elektromagnetisk kompatibilitet, kabeldragning samt kontaktering. Slutsatsen för examensarbetet är att protokollet kan användas i framtida Ethernet-tillämpningar.

Place, publisher, year, edition, pages
2011.
Series
Trita-CSC-E, ISSN 1653-5715 ; 2011:126
National Category
Computer Science
Identifiers
URN: urn:nbn:se:kth:diva-130743OAI: oai:DiVA.org:kth-130743DiVA: diva2:654190
Educational program
Master of Science in Engineering - Computer Science and Technology
Uppsok
Technology
Supervisors
Examiners
Available from: 2013-10-07 Created: 2013-10-07

Open Access in DiVA

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Other links

http://www.nada.kth.se/utbildning/grukth/exjobb/rapportlistor/2011/rapporter11/matzols_erik_11126.pdf
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