DEVICE TO CONTROL TRACK UNOCCUPIED STATE Russian patent published in 2012 - IPC B61L23/16 

FIELD: transport.

SUBSTANCE: invention relates to railway equipment, particularly, to railway ACSs and remote control systems. Proposed device comprises signal frequency generator, current limiter, filters, rectifiers, ADC, interfaces, logical element AND, register, track circuit. Additionally, this device incorporates trigger, two smoothing filters, Schmitt trigger, comparator, digital filter, Schmitt trigger, and flip-flop. Note here that signal frequency generator output is connected via current limiter, first filter and first interface with one end of track line. ADC input is connected via second interface, second filter, second rectifier, second smoothing filter to track line second end. ADC output is connected to comparator B-input, register D-input and digital filter input. Digital filter output is connected to flip-flop input. Flip-flop output is connected to register C-input. Register output is connected to comparator A-input. Comparator output is connected to second input of logical element AND. Output of logical element AND is connected to trigger R-input. Current limiter outputs are connected to trigger S-input via first rectifier, first smoothing filter, and Schmidt trigger. Trigger output and signal frequency generator input are connected to device that controls previous track line unoccupied state. First input of logical element AND is connected to device that controls next track line unoccupied state.

EFFECT: higher reliability of control.

1 dwg