RU2459737C1 - Device to control track unoccupancy - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to railway equipment, namely, to railroad ACS and telemetry hardware and be used for traffic control. Proposed device comprises signal frequency generator, current limiter, filters, rectifiers, ADC, track transformers, logical element AND, memory register and track circuit. Additionally, proposed device incorporates trigger, smoothing filter, Schmidt trigger, comparator, diode, and capacitor. Signal frequency generator output is connected via current limiter, first filter and first track transformer, with one end of track line. Track line second end is connected via second track transformer, second filter, rectifier, smoothing filter, with ADC input while ADC output is connected to comparator A-input and register C-input. Register D-input is connected with trigger output and device controlling unoccupancy of previous track line while its output is connected with comparator B-input. Comparator output is connected with second input of logical element AND. First input of said element is connected with device controlling unoccupancy of next track line and its output is connected with trigger R-input. Current limiter outputs are connected via diode, capacitor and Schmidt trigger with S-input of said device.

EFFECT: higher reliability of track state control.

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Description

The invention relates to railway equipment, namely to railway automation and telemechanics for regulating the movement of trains.

A device for monitoring the freedom of a rail line containing a pulse generator, two pulse counters, five triggers, a multiplexer, an analog-to-digital converter, an adder, a memory unit, two registers, a subtractor, a demultiplexer, a receiver, a filter, a logical element And, an element for fixing the state of a rail line in the form of triggers [RF Patent No. 2025358. A method of controlling the freedom of travel sections and a device for its implementation, the authors Polevoy Yu.I., Streltsov S.K., Mazalova I.A., Kravtsova N.A., publ. 12/30/1994, BI No. 24].

The disadvantage of this device is the low reliability with reduced insulation resistance.

A device for monitoring the freedom of a rail line implemented in a rail circuit containing a power source (generator), four filters, two rectifiers, two ADCs, memory registers, a programmable memory device, a current limiter, a clock generator, I logic elements, a rail line, transformers as a matching device [A.S. 1799787. Rail chain. Field Yu.I. et al., publ. 03/07/1993, BI No. 9].

The disadvantage of this device is the low reliability with reduced insulation resistance.

This technical solution is taken as a prototype. The technical result is to increase the reliability of monitoring the freedom of the rail line.

The technical result is achieved by the fact that in the device for monitoring the freedom of a rail line containing a signal frequency generator, a current limiter, filters, rectifiers, an analog-to-digital converter (ADC), track transformers, an AND logic element, a memory register, a rail line, a trigger is additionally introduced, smoothing filter, Schmidt trigger, comparator, diode, capacitor, and the output of the signal frequency generator through a current limiter, a first filter and a first track transformer connected to one end of the rail line, the second end of which is through a second track transformer, a second filter, a rectifier, a smoothing filter connected to the input of an analog-to-digital converter, the output of which is connected to the A-input of the comparator and C-input of the register, the D-input of which is connected to the trigger output and the control device the freedom of the previous rail line, and the output is with the B-input of the comparator, the output of which is connected to the second input of the logic element AND, the first input of which is connected to the device for controlling the freeness of the subsequent rail line, and the output - with the R-input of the trigger, with the S-input of which through the diode, capacitor and Schmidt trigger are connected to the terminals of the current limiter.

Figure 1 presents a diagram of a device for monitoring the freedom of a rail line, which shows a signal frequency generator 1, a current limiter 2, a first filter 3, a first track transformer 4, a diode 5, a capacitor 6, a Schmidt trigger 7, a trigger 8, a logical element And 9 , rail line RL 10, second track transformer 11, second filter 12, rectifier 13, smoothing filter 14, analog-to-digital converter (ADC) 15, register RG 16, comparator KOM 17.

Elements of the circuit are connected as follows. The output of the signal frequency generator 1 through the current limiter 2, the first filter 3 and the first track transformer 4 is connected to one end of the rail line 10, the second end of which through the second track transformer 11, the filter 12, the rectifier 13, the smoothing filter 14 is connected to the analog-to-digital input a converter 15, the output of which is connected to the A-input of the comparator 17, the C-input of the register 16, the D-input of which is connected to the output of the trigger 8 and the control device of the freedom of the previous radar, and the output is connected to the B-input of the comparator 17, the output of which is connected to W eye input of the AND gate 9, the first input of which is connected to the control device freeness follow the rail line, and output - with R-input of the flip-flop 8 to S-input of which the diode 5, capacitor 6 and the trigger Schmidt 7 connected conclusions current limiter 2.

The device operates as follows.

From the output of the signal current generator 1 through the current limiter 2, the first filter 3 and the first track transformer 4, voltage is supplied to the rail line of the radar 10. When the train approaches, the current of the current limiter 2 increases and the voltage drops across it. The voltage from the current limiter 2 through the diode 5 and with the participation of the capacitor 6 is supplied to the input of the Schmidt trigger 7. This Schmidt trigger switches when the threshold voltage at its input is exceeded and cockes the trigger 8, which is perceived as an occupation of the radar. The threshold value of the installation of the Schmidt trigger 7 is selected 10-15% below the voltage value that occurs when a regulatory shunt is applied to the coordinate of the connection of the signal current generator 1 at the maximum insulation resistance. After switching the Schmidt trigger 7, the trigger 8 is cocked, so that the voltage of the receiving end is recorded in the register 16 and taken as the threshold, and the control signal for the occupancy of the next rail line is sent to the control unit for the freedom of the previous radar. The voltage at the input of the analog-to-digital converter (ADC) 15 is supplied from the receiving end of the RL 10 rail line through the second track transformer 11, the second filter 12, the rectifier 13, the smoothing filter 14. From the output of the ADC 15, the voltage value in the form of a binary code is sent to C- register input 16 and A-input of comparator 17. Comparator 17 compares the current voltage of the receiving end (binary code at input A) with a threshold value (binary code at input B). When the current voltage of the threshold value is exceeded, a logical unit appears at the output of the comparator, which by means of the logic element And 9 resets trigger 8, fixing the release of the RL 10 rail line. The release of the RL 10 rail line is controlled provided that the next rail line is busy.

Underestimation of the threshold voltage at the input of the Schmidt trigger 7 by 10-15% leads to the fact that in the register 16 is recorded an overestimated release voltage (equivalent safety factor).

Computer studies have shown that the proposed device provides reliable control of the freedom of the rail line while lowering the insulation resistance to 0.2 Ohm · km and the length of the radar to 2 km.

Claims (1)

A rail line freedom control device containing a signal frequency generator, a current limiter, filters, rectifiers, an analog-to-digital converter, track transformers, a logic element And, a memory register, a rail line, characterized in that it also includes a trigger, a smoothing filter, a trigger Schmidt, comparator, diode, capacitor, and the output of the signal frequency generator through a current limiter, a first filter and a first track transformer connected to one end of the rail line, the second end to through the second track transformer, the second filter, the rectifier, the smoothing filter is connected to the input of the analog-to-digital converter, the output of which is connected to the A-input of the comparator and the C-input of the register, the D-input of which is connected to the output of the trigger and the control unit for freedom of the previous rail line and the output is with the B-input of the comparator, the output of which is connected to the second input of the logic element AND, the first input of which is connected to the device for controlling the freedom of the subsequent rail line, and the output is with the R-input of the trigger, with S - the input of which through the diode, capacitor and Schmidt trigger are connected to the terminals of the current limiter.