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Apparatus and system for generating a reference signal indicating the speed of a railway or tramway vehicle

  • US 20050279553A1
  • Filed: 05/24/2005
  • Published: 12/22/2005
  • Est. Priority Date: 05/25/2004
  • Status: Abandoned Application
First Claim
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1. An apparatus for generating a reference signal indicating the speed of travel of a railway or tramway vehicle provided with an air-operated braking system including a control system, in particular an anti-wheelslip control system associated with a group of wheels on the vehicle, comprising a group of speed sensors associated with corresponding wheels of said group and a control unit connected to said speed sensors and arranged to calculate by means of software according to pre-established procedures a reference speed indicating the speed of travel of the vehicle;

  • the apparatus also comprising analogue processing circuit means arranged to generate by means of hardware, on the basis of the signals supplied by the above-mentioned speed sensors, a speed signal correlated to the speed of travel of the vehicle;

    said analogue processing circuit means being connected at the output to said control unit, which is arranged to supply an enabling signal allowing operational use of the speed signal supplied by said analogue processing circuit means, only when the value of the speed indicated by said speed signal meets a predetermined comparison criterion in relation to the value of the reference speed calculated by means of software by said control unit.

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