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The art of car mechanics

Today’s cars are full of functions making them more environmentally friendly, safe and comfortable. However, all these improvements have also made it harder to find the fault when something does go wrong. One efficient solution is a system for diagnosis based on probabilities

A modern truck is equipped with 30-35 steering components, computers that each perform many tasks. They receive information from hundreds of sources and send instructions to regulating units managing different functions in the car.

“These are vehicles with a lot of functions. These functions are great as long as they work, but then they don’t then things can go badly wrong”, says Anna Pernestål, PhD student at the Division for Vehicular Systems at Linköping University and Scania CV AB.

In her doctorial thesis Probabilistic Fault Diagnosis with Automotive Applications she describes systems for finding and diagnosing faults devised from methods of probability. In simple terms this means calculating the probability of different faults based on all available information, such as up-to-date measurements from sensors in the vehicle, historical data, models and different types of expert knowledge. The system can work both in the car whilst driving and whilst stationary in a repair shop.

Therese Winder 2009-12-18

Page manager: therese.winder@liu.se
Last updated: 2009-12-18