Abstract
Abstract. In automotive application new point-to-point (P2P) wideband communication systems e.g. Automotive Ethernet 100BASE-T1 imply an increasing effort in safeguarding its electromagnetic compatibility (EMC). The state-of-the-art EMC safeguarding process proposes a pre-compliant system level test before the vehicle level test, which may have significant variation in test results due to the different electromagnetic environment. This work presents an approach to calculate the emission signal at the vehicle antenna from the ECU output signal given by the power spectral density (PSD) of the Automotive Ethernet ECUs. The determination is performed via a transfer function which describes the coupling between the Ethernet wire harness and the antenna. This approach considers the modelling of the complex vehicle environment by the transfer function which promises the determination of an accurate emission signal before performing the vehicle level test. Further, the transfer function for a specifically EMC critical cable harness routing along the cockpit area is analyzed in more detail with a 3D simulation, which validates the chosen measurement technique of the transfer function.
Highlights
In the automotive industry the demand for high-speed communication links is leading to a trend from classical automotive bus systems to high-speed P2P communication systems (e.g. Automotive Ethernet)
With the presented approach from this contribution, where the emission signal is calculated by the transfer function and the input signal, a maximum deviation of 7 dB has been achieved for a bidirectional, full duplex communication
In this work a way is shown for the determination of a transfer function describing EM emissions from twisted wire pairs to antennas in vehicles
Summary
In the automotive industry the demand for high-speed communication links is leading to a trend from classical automotive bus systems to high-speed P2P communication systems (e.g. Automotive Ethernet). Based on this research situation, the objective of this work is to determine and verify the transfer function from an unshielded twisted wire pair (TWP) cable harness and the vehicle antenna for the FM-frequency range This allows to verify the EMC behaviour of a differential communication system at an early development stage, even before the first hardware is available. The emission signal |Y (f )| of an Automotive Ethernet 100BASE-T1 ECU in a real vehicle is to be determined and compared with the state-of-the-art EMC safeguarding process via a system-level test This should provide initial insight into the EMC performance of the ECU, after it has been developed and even before measuring the emission in the real vehicle. The measured and simulated transfer function is discussed
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