A method for diagnosing the train speed of low-floor vehicles

Abstract

The invention discloses a speed diagnosis method of a low-floor train. The method comprises: step 1, determining the effective speeds of the train, wherein a TCMS automatically diagnoses whether all reported train speeds are valid during each set time period T to determine the effective speeds of the train; step 2, diagnosing the actual speed of the train, wherein the TCMS diagnoses the actual speed of the train according to the running status of the train; firstly taking the maximum value Vmax (t+1) of all the effective speeds determined in step 1 when the train is in a braking state; then determining the end speed Vt+1=Vt-a1*T of the set time period T, wherein the actual speed of the train takes the maximum value between Vmax (t+1) and Vt+1. The speed diagnosis method of the low-floor train actively calculates the current speed value of the train through deceleration during braking and coasting, instead of directly taking the speed value reported by the speed sensor. Therefore, the braking force can be applied more accurately, and the train can be stopped at an accurate position without rim abrasion.

Description

technical field [0001] The invention relates to the technical field of urban public transportation, in particular to a method for diagnosing the train speed of low-floor vehicles. Background technique [0002] Low-floor trams run on urban pavement rails. Due to rain and snow, bogies often run idling and slide. Among them, idling means that the wheels rotate on the track without moving forward, and the shaft speed collected is very high, but they do not actually move forward. Sliding means that the wheels slide on the track, that is, the axle does not rotate, and the collected speed is 0, but the car is actually in motion. [0003] However, the low-floor train traction system, braking system, and safety recording equipment are all equipped with their own independent speed sensors, so that 8 or more independent train speeds can be obtained. Moreover, the speed deviations of these reported independent trains are relatively large. If the trains do not have accurate speeds when...

AI Technical Summary

Problems solved by technology

[0010] 1. During traction, the speed calculation is inaccurate, which may easily cause the traction force to be too large or too small, the impact of the train to be too large or the traction force of the vehicle to be insufficient, which will greatly affect the comfort of passengers

[0011] 2. When braking, the calculation of the braking distance is inaccurate due to the inaccurate speed diagnosis, which affects the calculation of the braking force

If the calculation of the braking force is too small, the car cannot stop at the exact position; if the calculation of the braking force is too large, part of the bogie of the vehicle will be locked, and the locked wheels will be scratched

[0012] 3. Inaccurate speed calculation during coasting will cause inaccurate initial speed when the train transitions from coasting to traction or braking, resulting in inaccurate traction or braking force applied by the train, which will easily cause excessive train impact and affect passenger comfort have an impact