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Förslaget inkom 2010-05-03

Model based methods for improved maintainability and safety

The electrical system of modern vehicles involves a large number of electronic control units, sensors and actuators connected to a network by communication buses. Within this network SW components are distributed to realize various vehicle functionalities for handling, safety, comfort, etc. This kind of system is very complex, and in order to develop, verify, visualise, and analyse the system, model based methods and tools may help.
The automotive electrical systems are also difficult to fault trace when components fail in aftermarket, and therefore on-board diagnostic functions and off-board fault tracing methods are developed to help the maintenance technicians. Still, the development of the on-board diagnostic system and the fault tracing method is complicated, and to support this model based methods are employed. By modelling both the wanted behaviour of the electrical system as well as failure behaviour of the system components, the fault tracing method (fault trees) may be calculated. Moreover, the calculation may be used to indicate where the on-board diagnostic functions may be improved to simply the fault tracing; an analysis which could be very useful in the system specification phase.

A complementary utilisation of the method is to calculate the system effects of a component failure, i.e. to calculate a FMEA (failure mode and effect analysis); which may used as input to improve the system design. Thus, for complex systems, model based methods may help to improve the maintainability, safety and reliability of the system.

Thesis purpose:
The purpose of the thesis is to investigate the usage of model based methods in early design phases to improve maintainability, safety and reliability. The commercial tool Rodon will be used, which is based on the modelling language Rodelica (similar to Modelica).

The work will focus on the utilisation of the Rodon tool on some real design cases, and evaluate the outcome and benefits of the tool. It will also be investigated how the level of modelling details will affect the results. There will be a special focus on the FMEA approach to help safety and quality analysis. Typically, FMEAs from the tool may be compared to traditionally developed FMEAs in order to judge the benefits with a model based approach. Depending on the time and interest of the thesis student there are several possible directions to extend the work – it would for example be possible to investigate where in the process and the tool chain this activity fits and the relations to the upcoming standard for functional safety, ISO14229.

Qualifications of the student:
The student should preferably have a background en electrical or computer engineering or similar. It is preferable with experience in model based development tools, e.g. in tools like Simulink or Dymola (Modellica).

The thesis objectives may be designed to fit master or bachelor students.

Only one student is expected.

Start date:
As soon as possible.


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