Effect of relay switched signals on CAN, LIN and FlexRay networks

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Dr. Csorba Kristóf
Department of Automation and Applied Informatics

The rapid development of electronics inspires the automobile industry as well. Due to this process the comfort electronic became a part of the car, next to the safety critical devices. Some of the electronic control units stand alone and do not require any communication with other ECUs (Electronic Control Unit). But in order to function properly and secure, the sensors and actuators have to co-operate.

The signals of these ECUs have to be led to the central control unit, called the body-computer. The body-computer manages the signal coming from the sensors and decides what should be done. The result and the desired activities are sent to the actuators via the communication bus of the car.

The communication has high importance in the automotive industry, so high reliability is demanded. Nowadays the test process of the ECU is in progress during the development as well, because mistakes made in development come to the surface and can be fixed.

In case of a lot ECU the point-to-point connection is too expensive and complicated due to the lots of wiring, which inspired the spread of communication networks. In the test process only the device under test is on the bus, which circumstance is not real, so the other ECUs placed on the real bus must be simulated. These can be modelled with RC elements. When these calculated loads are connected to the bus, different disturbances and delays appear.

My thesis deals with different types of connections on the bus line, and discusses the realization of a switch module.


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