Method and device for monitoring speed

Abstract

A method and a corresponding device enable monitoring the speed of rail vehicles. In order to enable a reduction and simplification of the required system components and a speed monitoring that is not only intermittent, it is provided that the rail vehicle emits a signal, the propagation time of which is evaluated on the track side with regard to the speed. The evaluated signal is transmitted back to the rail vehicle.

1 - 4 . (canceled) 
     
     
         5 . A method for monitoring the speed of a rail vehicle, the method which comprises:
 emitting a signal from the rail vehicle;   receiving the signal trackside and evaluating a propagation time of the signal on the trackside with respect to a speed of the rail vehicle; and   transmitting the evaluated signal back to the rail vehicle.   
     
     
         6 . The method according to  claim 5 , wherein the signal is a radio frequency identification RFID signal, and the RFID signal is emitted, evaluated, and transmitted back to the rail vehicle. 
     
     
         7 . The method according to  claim 5 , which comprises, if the signal indicates that a maximum permissible speed is exceeded, transmitting a signal back to the rail vehicle that triggers forced braking of the rail vehicle. 
     
     
         8 . A system for carrying out the method according to  claim 5 , comprising:
 a vehicle device with a transmitter/receiver module;   a trackside device with a receiver/transmitter module, said trackside device having an evaluation unit connected to said receiver/transmitter module for evaluating a signal received from said transmitter/receiver module with regard to a speed of the rail vehicle.