Vital track circuit wheel detector

Details Vital track circuit wheel detector Vital track circuit wheel detector

B - Operations, Transporting

61

L

346/61, 340/124.

B61L 1/18 (2006.01)

Patent

CA 1210490

VITAL TRACK CIRCUIT WHEEL DETECTOR Abstract of the Disclosure A vital, or fail-safe, track circuit wheel detector for detecting the presence and position in a given detection zone of wheel-axles on railroad cars; in order to provide the requisite fail-safe indication, the operation of the system relies on a sensing means which produces two distinct output signals. The sensing means includes a biasing arrange- ment for providing, even in the absence of wheel-axles, a steady output signal derived from the path of normal feed current flow. This bias signal is countered or opposed by a wheel sensing signal from the same sensing means responsive to flux level changes resulting from the presence of particular directional components of wheel-axle shunt current, whereby a dip or net reduced signal is effectuated; in the case of open circuit conditions, the output indication goes to zero when there are no wheel-axles in the detection zone.

445065

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