Hardware Synthesis of Automated Electrical Fault Testing in Trucks
Sammanfattning: 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.
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