| 摘要 |
<p>The apparatus is designed to generate a reference signal (vR) indicating the speed of a railway or tramway vehicle provided with a braking system including a control system (2; S1-S4; 4), in particular an anti-wheelslip control system associated with a group of wheels (R1-R4) on the vehicle, comprising a group of speed sensors (S1-S4) associated with corresponding wheels (R1-R4) of said group and a control unit (2) connected to said speed sensors (S1-S4) and arranged to calculate by means of software according to pre-established procedures a reference speed indicating the speed of the vehicle. <??>The apparatus (1) comprises an analogue processing circuit (3) arranged to generate by means of hardware, on the basis of the signals supplied by the above-mentioned speed sensors (S1-S4), a speed signal (VR) correlated to the speed of the vehicle. This circuit (3) is connected at the output to the above-mentioned control unit (2), which is arranged to supply an enabling signal capable of allowing operational use of the speed signal (VR) supplied by said circuit (3) only when the value of the speed indicated by this speed signal (VR) meets a predetermined comparison criterion in relation to the value of the reference speed calculated by means of software by the control unit (2). <IMAGE></p> |
