| CPC B61K 9/12 (2013.01) [G01M 17/10 (2013.01)] | 18 Claims |
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1. A method for automatic wheel diameter measurement and calibration, the method comprising:
measuring rotation of a wheel of a train when the train is travelling along a path,
determining positions of the train when the train is travelling along the path, wherein the positions are determined by a positioning system located on the train,
receiving, by a controller on the train, rotation data of the wheel and positioning data of the train, wherein the rotation data include number of wheel revolutions, and wherein the positioning data include a start point and an end point along the path travelled by the train,
extracting, by the controller, a distance between the start point and the end point from a database, and
automatically calculating, by the controller, a wheel diameter and a wheel diameter inaccuracy, wherein the wheel diameter is calculated on the number of wheel revolutions and distance traversed by the train,
adjusting, by the controller, a wheel diameter value in an onboard unit (OBU) of the train using a calculated wheel diameter, and
logging an event, by the controller or the OBU, each time the wheel diameter value is adjusted, recording the calculated wheel diameter and the wheel diameter inaccuracy along with a time stamp, and reporting the event which results in an update to set wheel diameter values to an event recorder (ER) onboard the train,
wherein the OBU of the train is configured to allow a user to access wheel diameter data via a diagnostic screen, and
wherein extracting the distance between the start point and the end point from the database comprises
matching the start point and the end point to points in the database, and
calculating the distance by summing lengths between the points in the database.
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