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Models for Distributed electromagnetic Immunity in Vehicles.

Founding Body: MEC

Collaborators: UPC, CIMNE, SEAT

From/To: 2004/2007

There is a clear move to radio based systems for desktop or personal digital networks, thus reducing the need for cabling and increasing the connectivity. Automotive environments are very special cases because there could be a significant number of personal radio sources in the nearby of the vehicle communication systems, which can use cables or radio links. In addition, all those things are placed in an electromagnetically bounded space. The electromagnetic environment produced by this particular situation is far from what is assumed in current standards for electromagnetic immunity for vehicle systems. Because of this situation, it is necessary to study in detail the interaction between these electromagnetic sources inside the vehicle, to know the electromagnetic field produced by them and to assess the effect on the immunity of critical systems. This will be the objective of the project. In first place we will characterize such environment, using both numerical and experimental approaches, including transient EMI sources, like those arising from the 42V PowerNet technology, and taking into account the presence of passengers within the car. To achieve this task we will develop suitable computation tools and characterize in the time domain the near field probes we have already developed. In the second place we will estimate the energy coupled to different vehicle systems, either by direct coupling or through communication cables. Finally the effect of this coupled energy on the immunity of different component will be established, both by circuital simulations linked to the electromagnetic simulations and by direct measurement on sensitive systems placed inside of a dummy car.