Method of determining the speed of railway vehicles, in particular those with bogies

摘要

PCT No. PCT/DE94/00054 Sec. 371 Date Dec. 20, 1995 Sec. 102(e) Date Dec. 20, 1995 PCT Filed Jan. 20, 1994 PCT Pub. No. WO94/17422 PCT Pub. Date Aug. 4, 1994In order to exclude disturbing influences in the determination of the axle-related speeds of railway vehicles, the signals generated by the passage of the last axle of a bogie are discerned from spurious signals. This is carried out by specifying a time window within which the last axle of a bogie must have passed the measuring zone. Those signals separated by about the same offset time as the time between the passage of the first axle of the first and second sensors are used for the determination of the speed of this last axle. An additional integrity check further increases the reliability signal identification by comparing the sum of certain measured time values which have been detected by the two sensors of the measuring zone. The assignment of the time values respectively to the pulse centers of the event indication eliminates different response tolerances of the sensors due to the lateral offset of the vehicle wheels with respect to the rails in the region of the sensors. The speed of railway vehicles may thus be reliably and continuously determined upon passing a measuring zone, even when the sensors generate spurious signals due to disturbances such as electromagnetic rail brakes or eddy-current rail brakes on the vehicles./!