Evaluation of Communication Interfaces for ElectronicControl Units in Heavy-duty Vehicles; Utvärdering av kommunikationsgränssnitt för styrenheter i tunga fordon

by Henrik Johansson

Institution: Linköping University
Year: 2012
Keywords: Embedded systems; automotive; Inbyggda system; fordon; Engineering and Technology; Electrical Engineering, Electronic Engineering, Information Engineering; Embedded Systems; Teknik och teknologier; Elektroteknik och elektronik; Inbäddad systemteknik; Technology; teknik; Vehicular Systems; Examensarbete i Fordonssystem
Record ID: 1352885
Full text PDF: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-78869


The number of electronic control units in heavy-duty vehicles has grown dramatically overthe last few decades. This has led to the use of communication buses to reduce the complexityand weight of the networks. There are reasons to believe that the de facto standardcommunication interface in the automotive industry, the Controller Area Network, is obsoletein some areas. Hence an evaluation of available communication interfaces is needed.This study focuses on lower levels of the Open Systems Interconnect (osi) model. Initially atheoretical study is presented in order to give an overview of automotive embedded systemsin general and different communication interfaces in particular. Ethernet and FlexRay areidentified as two interfaces of interest for future use in Scanias vehicles. The former is new inautomotive applications but is believed to become popular over the years to come. A possibleuse of this interface could be as a backbone to take the load off other interfaces. The use ofFlexRay in Scanias vehicles is limited because of the modular system used and the staticscheduling needed. It could however be used between mandatory ecus where the nodes andthe messages are all known beforehand.The report also contains the result from emission measurements on a number of interfacesperformed using a stripline antenna in a shielded enclosure. Strong conclusions can not bedrawn since it’s hard to tell what the transceivers, circuit boards and interfaces contributedto in the spectra with the method used. The FlexRay hardware is worse than for the otherinterfaces. Similarities can be seen between low-speed and high-speed can but it could becharacteristics of the transceivers used rather than the interface itself.