Design of an automotive event data recorder

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Dr. Tóth Csaba
Department of Measurement and Information Systems

In my thesis, I examine some aspects of the concept of a motor vehicle on-board data recorder, especially the feasibility of some of its essential functions and the sizing of a few of its cost sensitive electronic components, but I do not aim to design a

fully-completed, finished product.

The data recorder unit of this automotive black box has two main parts. They are the motion tracker and the data bus communication monitor.

The content of the data bus messages of motor vehicles is usually not public, therefore the function of the communication monitor is limited to data saving. Accordingly, my thesis focusses on the other main components of the black box, the inertial measurement unit in particular.

The main task of the measurement unit is to track the motion of a car for a few seconds in order to ascertain (from the recorded data) whether the driver intended to intervene to prevent the accident (for example if there was any steering input or emergency brake) as well as to get information about the vehicle’s maneuverability in the few seconds preceding the accident (for example whether the vehicle was in motion or upside down).

While writing my thesis, I undertook to ascertain whether it is possible to design a

cost-effective automotive on-board data recorder containing an inertial measurement unit without GPS which meets the conditions mentioned above.

On the one hand, my thesis provides a comprehensive analysis of the physical and mathematical methods and applied algorithms related to the theory of inertial measurement units. On the other hand it contains all the experience I gained while implementing these methods. Moreover, I present some of my reflections connected to the sizing of the inertial measurement unit’s hardware components.


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