Wheel set geometric measurement method, system and device

The invention discloses a wheel set geometric measurement method, system and device, and relates to the technical field of rail transit wheel set measurement, the measurement method comprises the following steps: S1, when a train wheel set travels to a first trigger sensor, triggering a first laser sensor combination and a second laser sensor combination to continuously collect wheel tread contour data between the first laser sensor combination and the second laser sensor combination; when the train wheel pair moves to the second trigger sensor, data acquisition is stopped; and S2, constructing a wheel motion dynamic coordinate system, obtaining the relationship between the wheel diameter and the collected data, generating the geometric dimension of the wheel set through real-time calculation, and outputting the geometric dimension of the wheel set. According to the method, fuzzy trigger control logic is adopted, vehicle wheel set tread data can be obtained and the optimal contour can be extracted without acc