Patent ID: 9050983
Filing Date: 2015-06-09
Classification: B61L

Abstract:
1. An onboard apparatus incorporated in a train, which updates a train position identified based on position information from a GPS receiver, by adding a running distance to the train position based on information from a speed power-generator that is obtained in a cycle shorter than a position-information acquisition cycle of the GPS receiver, the onboard apparatus comprising: a route database that stores a start distance and an end distance from a start point and a section length of a radiowave-reception difficult area where GPS signal reception is difficult in a running area of the train; an onboard control device configured to check the route database to determine whether the train is in the radiowave-reception difficult area, and when the train is not in the radiowave-reception difficult area, confirm whether position information has been obtained from the GPS receiver, and when the position information has not been obtained from the GPS receiver, execute control to stop the train based on the running distance and a determination threshold for determining whether to stop the train, wherein when position information has not been obtained from the GPS receiver, in a case where a section of the running distance does not include the radiowave-reception difficult area, the onboard control device is configured to compare the running distance with the determination threshold, and execute control to stop the train when the determination threshold is smaller than the running distance, and in a case where the section of the running distance includes the radiowave-reception difficult area, the onboard control device is configured to compare a value obtained by subtracting a section length of the radiowave-reception difficult area, which is stored in the route database, from the running distance with the determination threshold, and execute control to stop the train when the determination threshold is smaller than the value.