Mitsubishi Electric Corporation

Hidetoshi Homma

Masayuki Takeyama

Ryuya Mo

An inter-vehicle network that connects monitoring and control devices communicating with an intra-vehicle network that couples in-vehicle devices with the monitoring and control devices. A train clock station at an uppermost level in a hierarchical structure and a vehicle clock station in a middle level in a hierarchical structure are established from the monitoring and control devices. Other devices are established as a correction information waiting station at a lowermost level in the hierarchical structure. The train clock station performs a time correction of its own station with time information that is arbitrarily obtained as reference time. The vehicle clock station performs a time correction of its own station based on a message transmitted from the train clock station. The correction information waiting station performs a time correction of its own station based on a message transmitted from the vehicle clock station.

Time synchronization system and time synchronization method in train

A pair of transmission linesare provided in the train in such a manner that, at each of the two ends of each of the carriage groups, one of the train end detection switchesis connected to one of the pair of transmission lines. A resistoris inserted in at least one of the pair of transmission lines, and a voltage detector measures a voltage V, Vbetween the pair of transmission lines at each of both ends of the resistor. A controlling unit controls a first and a second switchesin such a manner that there is only one location within the train where a power supplyis inserted between the pair of transmission lines, and the controlling unit recognizes the configuration of the train based on the voltages that have been measured by the voltage detectors.

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Kobe, Japan

Hidetoshi Homma