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Hardware Synthesis of Automated Electrical Fault Testing in Trucks
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.
2015 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Utveckling av hårdvara för automatisk testning av lastbilselektronik (Swedish)
Abstract [en]

In modern trucks there is a number of control units, which tasks are varying;

control of the engine, brakes, gearbox, etc. In order to ensure that these devices

work properly, they must be thoroughly tested under normal conditions but also

when they are exposed to stresses such as electrical faults (short circuit, breaks,

etc.). A breakout box, BOB, is a type of test equipment used to stress test a

controller by inducing electrical fault on its cables. It is done manually and is

time consuming.

The aim of this thesis is to develop an ABOB (Automated BreakOut Box). It

should be placed in the driver's cab. It was designed in three different versions.

Electrical faults are simulated. They along with a test program verify that no

serious events occur for the vehicle. Literature studies of earlier works with

automated electrical faults were made initially as a background for the selection

of the automation method.

The faults that have been implemented for the prototype of the ABOB is

short circuit with di_erent supply voltages (including earth) and breakage. This

report describes the development from a simple functional model to prototype

with a focus on the hardware. The ABOB can run automatically without human

interaction except at boot time. The ignition needs only to be switched on and

the device can work in the evening and at night. The results were that the

implemented ABOB could simulate the given electrical faults with verification.

The automation method proved feasible.

The work has been done in cooperation with Anna Bladh. This report

takes up the hardware of the prototype for the three versions. Anna's report

describes the software in the System design of automated test equipment for

electrical control units into trucks.

Abstract [sv]

I moderna lastbilar sitter ett flertal styrenheter, vars uppgifter varierar; styrning

av motor, bromsar, växellåda osv. För att säkra att dessa enheter fungerar som

de ska måste de testas noggrant - dels under normala förhållanden men också

då de utsätts för påfrestningar såsom elektriska fel (kortslutning, avbrott osv.).

En breakout box, BOB, ar en typ av testutrustning som används för att stress

testa en styrenhet genom att inducera elektriska fel på dess kablage. Det görs

manuellt och ar tidskrävande.

Syftet med det här examensarbetet är att ta fram en ABOB (Automatiserad

BreakOut Box). Den ska placeras i förarhytten. Under arbetets gång designades

ABOB:en i tre olika utföranden. Elektriska fel simuleras. De tillsammans med

ett här framtaget testprogram verifierar att inga händelser inträffar för fordonet.

Litteraturstudier av tidigare arbeten med automatiserade elektriska fel gjordes

inledningsvis som bakgrund för valet av automatiseringsmetod.

Felen som har implementerats för ABOB-prototypen ar kortslutning med

annan matningsspänning (inklusive jord) och avbrott. Denna rapport beskriver

utvecklingen från en enkel funktionsmodell till färdig prototyp med fokus på

hårdvaran. ABOB:n kan köras automatiskt utan att tillsyn erfordras utom vid

uppstarten. Tändningen behöver bara slas på och enheten kan arbeta kvälls- och

nattetid. Resultaten blev att den implementerade ABOB:en kunde simulera de

givna elektriska felen med verifiering. Den framtagna automatiseringsmetoden

visade sig genomförbar.

Arbetet har skett i samarbete med Anna Bladh. Den här rapporten tar upp

prototypens hårdvara för de tre versionerna. Annas rapport beskriver mjukvaran

i System design of automated test equipment for electrical control units in

trucks.     

Place, publisher, year, edition, pages
2015. , 61 p.
Series
EES Examensarbete / Master Thesis, XR-EE-MST 2015:001
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-168246OAI: oai:DiVA.org:kth-168246DiVA: diva2:815180
External cooperation
Scania
Educational program
Master of Science in Engineering - Electrical Engineering
Examiners
Available from: 2015-05-29 Created: 2015-05-29 Last updated: 2015-05-29Bibliographically approved

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