SYSTEM FOR THE INDUCTIVE TRANSMISSION OF TRACK INFORMATION TO LOCOMOTIVES IN RAILWAY SIGNALLING SYSTEMS

摘要

A system for inductively transmitting track infor-mation to locomotives or trains in railway signalling sys-tems, wherein the locomotives or trains have magnets with active resonant circuits which are fed from equipment mounted on the locomotives or trains with currents of suitable frequency, wherein at particular points of the tracks there are track magnets with passive resonant cir-cuits which are enabled or not dependent on track infor-mation to be indicated, wherein, when a track magnet is passed over, an enabled passive resonant circuit extracts power from an active resonant circuit in the magnet of the locomotive or train which radiates that same fre-quency, whereby an information relay in said active re-sonant circuit is caused to change its state, wherein the active resonant circuits of the locomotive or tiain magnet are fed from a common, bridge-stabilized control gene-rator via frequency dividers and power amplifiers and wherein to supervise the value of the current flowing in an active resonant circuit, there is provided an evalua-ting unit with air adjustable threshold of response and storage behaviour, whose output is connected to the res-pective relay.