Railway switches and signals – Block-signal systems – Automatic
Patent
1983-11-22
1986-03-11
Reese, Randolph A.
Railway switches and signals
Block-signal systems
Automatic
246 42, 246 43, 246 61, B61L 2100
Patent
active
045750319
ABSTRACT:
A device for detecting the unbalance .DELTA.i between the two fractions of the return traction current flowing in the two rails of a railroad track, in the presence of a signalling current in the respective track circuit, includes a linear combination circuit (3) that receives two signals (i.sub.1 and i.sub.2) which are proportional to the two currents actually present in the two rails and obtains both the difference (i.sub.1 -i.sub.2) and the sum (i.sub.1 +i.sub.2) thereof. A demodulating circuit (4), fed with the difference signal, takes from it the modulating signal of the signalling current and feeds it to a sample generator circuit (5), which generates a sample function M(t). The sample function is supplied to two successive sampling circuits (106 and 206), one of which also receives the difference signal and produces a sampled difference signal M(i.sub.1 -i.sub.2), while the other also receives the sum signal and produces a sampled sum signal M(i.sub.1 +i.sub.2). Four filtering-rectifying parallel circuits (107,207,307,407) receive the sum and difference signals and the sampled sum and difference signals, and supply the mean values Fo [.vertline.i.sub.1 -i.sub.2 .vertline.], Fo[M.vertline.i.sub.1 -i.sub.2 .vertline.], Fo[.vertline.i.sub.1 +i.sub.2 .vertline.] and Fo[M.vertline.i.sub.1 +i.sub.2 .vertline] A function generator circuit (8) furnishes an output signal corresponding to ##EQU1## which is supplied to a switching circuit (11) along with the sum and difference signals. The switching circuit is controlled so as to give, at the output thereof, one of the signals
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Reese Randolph A.
Sasib S.p.A.
Wacyra Edward M.
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