Contrôle de vitesse par balises

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KVB control unit (center left) in a class Z 20500 railcar

Contrôle de vitesse par balises (abbreviation KVB) is a train control system in the SNCF Réseau network in France . KVB was also installed in London's St Pancras station , as the HS1 high-speed line that ends there is based entirely on French technology. The system consists of trackside balises with signal coding devices and a computer-controlled vehicle unit. It is a superposition system in which the signal from conventional signal systems is superimposed. The system is derived from the Swedish ATC train control system.

The letter K is used for abbreviation, as the C is already used for Commande in French railways .

implementation

The data is transmitted between passive trackside balises (two to nine pieces per signal) and an antenna mounted under the vehicle, which simultaneously supplies the balise with power as it passes by. KVB can be supplemented by continuous transmission in order to achieve an infill functionality (similar to Euroloop ).

KVB monitors:

  • Line speed, including permanent and temporary speed limits
  • Breakpoint
  • Dynamic braking profile
  • Speed ​​limits

If KVB discovers that monitored values ​​have been exceeded, the driver is warned. If this does not react to the warning, the train will be forced to brake .

KVB also controls the maneuvering, the transitions to other systems ( Transmission Voie-Machine ), takes over the switching of radio channels , the opening of the main switch , the lowering of the pantographs , the side selection for opening the doors, the selection of the height of the steps, the Command for airtightness in tunnels or in areas with chemical risk.

With regard to ETCS , KVB is managed as a national class B system (Class B system).

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