A modern way to control the electric devices in a car's door

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Naszály Gábor
Department of Measurement and Information Systems

The aim of my work was to design and produce a control system for vehicle doors, by which the advantages of the modern bus based control can be demonstrated against former solutions.

My job was to convert the driver side front door control of a first generation Ford Focus according to the actual automotive industrial practice. This door contains an electric window lifter, an electric mirror, the associated switches and a central locking module.

Originally all of the above mentioned elements were controlled by dedicated wires, which meant a massive bunch of cables. Instead, according to newer automotive solutions, I realized a LIN network inside the door that can be connected through a CAN-LIN gateway to the CAN bus operating in the automotive laboratory of the Department of Measurement and Information Systems at the Budapest University of Technology and Economics.

First I mapped the operation of all the electric devices with the help of the Technical Information System of the Ford Motor Company and laboratory measurements. Then the hardware units that are required for the communication and control were designed and manufactured. Finally I wrote the operating software in C programming language for all the units.

Thus, the assembled and tested vehicle control system can be operated according to the modern automotive industrial expectations connected to any CAN bus or also standalone via switches that can be found on the door.


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