Motor control platform design for EPS(Electronic Power Steering)

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Kovács Viktor
Department of Automation and Applied Informatics

Nowadays users in the automotive industry prefer built in power steering system in their cars because of the added safety and convenience. These systems provide assist for the driver turning the wheels. During driving the appropriate control of the power steering system plays a major role since failing to steer properly puts lives at risk.

I created a power steering control platform as a pilot project at the Automotive Steering department at Robert Bosch Ltd. In my thesis project I give details of the structure and the design of this electronic control unit from the idea to the implementation.

First of all I introduce the different kinds of power steering systems and their working mechanism then I specify the type of the system and the implementation process of my project. In my thesis I provide insight into the principles of the motor control describing the Field Oriented Control and the various control signals. I detail the algorithm of generating the SVPWM (Space Vector Pulse Width Modulation) control signals for the platform. After that I explain the operation of the device then I present the main integrated circuits that are necessary for the operation. I explain every module of the schematic design of the printed circuit boards designed for the platform and I describe their operation. During designing the PCB (Printed Circuit Board) layout several requirements came up that is why I provide detailed insight into the implementation of the design. Next I describe the structure of the software and I present the programing process of the peripherals. Finally I give a summary about the performed work and the further developmental possibilities.


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