TRACK CLEARING CONTROL METHOD Russian patent published in 2009 - IPC B61L23/16 

FIELD: railway transport.

SUBSTANCE: in compliance with the proposed method, voltages of pickup and current feed ends of every circuit are registered on switching the track generator and receiver, thereto and in turn. Track occupancy is registered with current voltage at the signal frequency receiver input reducing below the occupancy threshold. Track clearing is registered with current voltage at aforesaid receiver exceeding the clearing threshold. Both aforesaid thresholds are calculated with due allowance for reference voltage, and, before origination of train-shunt effects, are continuously corrected. Track circuit clearing threshold voltage is corrected pro averaged insulance of track circuit ends, with no effects of the train-shunt. Aforesaid insulance is determined from the ratio of feed end currents at the generator primary and auxiliary frequencies.

EFFECT: increased validity of track circuit state control at minor insulance.

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