METHOD OF CHECKING NON-OCCUPANCY OF TRACK SECTIONS Russian patent published in 2004 - IPC

FIELD: railway transport; railway signaling and communication.

SUBSTANCE: according to proposed method of checking non-occupancy of track section with continuous rails comes to the following: ac signal is supplied to rail line at one end and at other end changing of signal is measured depending on coordinate of train shunt, and non-occupancy of track section is revealed by character of signal change. After occupation of preceding track circuit and expiration of preset time interval, reference voltage is fixed, i.e., voltage across receiving end of said track circuit by which threshold of occupancy and non-occupancy of track section are determined by multiplying reference voltage by coefficient of occupancy and non-occupancy, respectively. Using said thresholds, state of track section is determined by comparing current voltage of receiving end of track circuit with said values. Then, when train has left said track section, value of reference voltage is re-determined and said value becomes equal to fixed percent of said reference voltage. With train moving further on, track section under checking and both adjoining track sections are freed, reference voltage becomes equal to current value, i.e. to reference voltage for track section under checking.

EFFECT: improved reliability of checking of track section occupancy.

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