Test automation for the electronic unit of an electro-mechaninc steering system

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Szabó Zoltán
Department of Automation and Applied Informatics

Car makers are now making great efforts to reduce fuel consumption and emissions. The changeover from the hydraulic steering systems to the electromechanical steering systems is significantly contribute to reduce fuel consumption. With the application of electromechanical steering systems, either automatic parking, side wind compensation and collision avoidance can be achieved.

The electric motor is one of the main component of the steering system. Its task is to help the driver during the steering by providing additional torque. To achieve this high torque, the motors must achieve the highest possible power density. In these power steering systems permanent magnet synchronous servo motors (using rare earth magnets) are mounted and developed, due to high power requirements and maintenance-free operation. As the motor is mechanically in direct contact with the steering wheel, its properties – such as torque ripple – directly affect the steering feeling and the comfort.

In my thesis I present the most important features of the three phase synchronous motor, its equations and a general form of control. In the second part of the degree I will describe the automated tuning of the parameters of the synchronous motor and its control, which are responsible for ensuring the maximum power density and continuous steering and comfort.


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