Railway circuit for sending signalling information along a railway line to a vehicle travelling along the railway line

摘要

RAILWAY CIRCUIT FOR SENDING SIGNALLING INFORMATION ALONG A RAILWAY LINE TO A VEHICLE TRAVELLING ALONG THE RAILWAY LINE Railway circuit suitable for detecting the free or occupied state of the same and for sending signalling information, using two overlapped and independent systems, along a raillway 1ine to a vehicle travelling along said railway line . The invention allows updating of a railway line to new safety requirements to define the free or occupied state of the railway circuit and leave the installations and equipment 0n board the railway vehicle unchanged. A signal generator (13), with protocol in compliance with the requirements for sending the information on board the railway vchicls, generates a signal I ( t ) with varying current modu1.ated (sj.gnallj.ng inforimation) with FSK technique on the basis of a modulation code (CODE). The signal i(t) is supp1ied to a coil (15) magnetically coupled with a first and a second rail (5a,5b) which constitute the sing1e railway circuit , to induce a variable current Iab(t) modulated by the code on the electric circuit formed by the portions of the first and second rail. short-circuited a1ternatively by the e1ectric joint, positio~ned a t the boundary of the rail-way circuit , or by an axle (12) of the travel.1j.ng vehic1.e. The rai-lway vehicle is provided with a curreii scnsor ( 17 ) suitable l or detecting the variable curircnt Lab(t) for extracti.on of the code (CODE) and sending the signal to the vehicle driver . A signal generator 30 (6) generates a signal in compliance with the new safety requirements to determine together with the receiver ( 9 ) the free or occupied state of the railway circuit .