Prediktering av komponenters mognad/kvalitet utifrån felkodsutfall

This master thesis has been carried out at Scania R&D at the department of Powertrain Control System Development during the winter 2011/2012. The purpose of the thesis was to produce a method that with the result of troubles codes from the field testing would be able to say something about the maturation of a component, in this case the VGT, variable geometry turbocharger. To start with, it was necessary to investigate hich information was available. After the information been summed up in tables and charts, this so that it was possible to understand the huge amount of data, the calculations started.Since the thesis was about maturation of a component the proportions were calculated of components that had a trouble code in contrast of those who passed the test without a trouble code. This Thesis includes background information about basic of statistics and about the company Scania and its testing process. The reader will also be able to read a short section about the component VGT.The proportions from the testing were analyzed together with the proportion from the customer with the help of linear regression. A connection between the two proportions could be shown. About the possibility of predicting when software will be ready for release, unfortunately it was not possible to produce a method for this, since the different tests had different conditions. Therefore instead a chart for displaying the results from the field testing was produced in a way that a comparison between different software versions could be made. To not break the confidentiality agreement all values are made up by the author.


Sophie Höglund

Lärosäte och institution

Uppsala universitet/Matematisk statistik


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