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The electro-magnetic noise generated in an HV inverter can be a significant side-effect when it interferes with automotive LAN communications. This paper provides a calculation method to estimate the spectrum of the noise propagating through the wire harnesses by modeling LAN wire harnesses as uniform multi-conductor transmission lines and ECUs as S-parameter elements. Applying this model to a test bench with actual automotive ECUs, the consistency of the calculation and actual measurement is evaluated. The calculated noise spectrum peaks agree with the measured noise spectrum peaks with a tolerance of 6dB within the frequency range below 20MHz.

As the number of ECUs in an automobile steadily increases, the demand for ever more ECUs connected to the Controller Area Network (CAN) also rises significantly. However, the number of connectable ECUs in a linear passive star CAN is restricted because of the ringing phenomenon in communication signals. In this paper, we propose a ringing suppression circuit activated on high level ringing voltages. As a result, we can expand the number of connectable ECUs in a linear passive star, which enables construction of low-cost communication networks by reducing the number of gateways required

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