Sumitomo Electric Industries, Limited

Sumitomo Wiring Systems, Limited

Autonetworks Technologies, Limited

Toshiya Hisada

Shinichi Ishiko

Satoshi Horihata

Masahiro Morikura

Daisuke Umehara

Yasuhiro Yabuuchi

Tetsuo Morita

A power line communication system is provided in which the influence of the impulsive noise unexpectedly generated on a power line which is a communication medium can be reduced according to the characteristics of the impulsive noise by an existing method and power line communication can be realized without a hindrance. A transmitter is constituted by: a modulator for conveying a LIN data signal by a power line; a filter that allows a signal of a predetermined band to pass therethrough; and a sinusoidal wave outputter (sinusoidal wave in the figure). In contrast, the receiver is constituted by the sinusoidal wave outputter, the filter and a demodulator that performs demodulation. To the power line, a limiter that limits the amplitude of the propagating signal to a predetermined amplitude (reception signal amplitude) is connected.

Power line communication system

A trunk line topology network is configured with an electronic control units being communication apparatuses transmitting and receiving data, and gateway apparatuses and a distribution apparatus being a specific gateway apparatus that are connected to a communication line being a trunk line, for relaying, through the gateway apparatuses, data transmitted among the electronic control units. The distribution apparatus includes a storage region utilized for a database. The data transmitted from the electronic control units are relayed by the gateway apparatuses and then aggregated by the distribution apparatus. The relayed data are stored once on the database. When transmitting data to the electronic control units, the distribution apparatus reads out data from the database and transmits the data at the adjusted transmission timing. The gateway apparatuses relay the transmitted data.

Communication system and relay apparatus

For voltage values (observed noise sequence) in an electronic power line (communication medium) which are obtained at a predetermined interval, initial values of noise characteristics based on a statistic of the observed noise sequence itself are decided by a moment method (Sto S), the noise characteristics (state transition probabilities and state noise power) for maximization of the likelihood of the observed noise sequence are obtained from the initial values by MAP (Maximum A Posteriori) estimation using a Baum-Welch algorithm (Sto S), a state sequence is estimated from the obtained noise characteristics, and an impulsive noise at each time point is detected.

Noise detection method, noise detection apparatus, simulation method, simulation apparatus, and communication system

A GW device for relaying data sent and received between a plurality of ECUs mounted in a vehicle stores data sent from the respective ECUs in a database and then timely sends the data. The database is stored in a time series in association with time information, and copies of database at a plurality of time points are sent to a central device at predetermined time intervals, or at the time of detection of occurrence of a problem.

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Osaka, Japan

Toshiya Hisada