METHOD OF OPEN-LINE STATE CONTROL Russian patent published in 2008 - IPC B61L23/16 

FIELD: transport.

SUBSTANCE: AC current signal is fed into the rail circuit at its one end to control the signal variation at its other end depending upon the train bridge circuit coordinate. The reference voltage, that is, the voltage at the receiver input, is recorded with the following rail circuit cleared, previous rail circuit occupied and after a lapse of tolerable time interval. The threshold voltage of the track occupation and clearing is determined by multiplying the reference voltage by occupation and clearing factors, respectively. A complex character is set up for the rail circuit output end input resistance with a capacitance component. Here note that the train bridge circuit moving off the rail circuit under analysis causes a voltage burst at the receiver input to be used for the first redefining of the reference voltage. A complex character is set up for the rail circuit input end input resistance with an inductance component that rules out the voltage burst at the receiver input with the train bridge circuit approaching the rail circuit input end. The second redefining of the reference voltage is affected with the clearing of the following rail circuit and cleared previous rail circuit.

EFFECT: higher reliability of the rail circuit state control.

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