JP2004224281A - Multiple-system train detection means for crossing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize the redundant configuration of a train detection device at the start point of an alarm by a simple structure at low cost. <P>SOLUTION: DC and AC voltages supplied as power voltages to a train detecting detector 6 and a crossing control element 4 installed at the start point of an alarm are superimposed by a transfer block 10 installed on a crossing road 3 side and transmitted to a transmission block 7 installed on the alarm start point side through a pair of cables 11a of a transmission cable 11. DC and AC train detection signals outputted from the detector 6 and the crossing control element 4 are superimposed by the transfer block 7 installed on the alarm start point side and transmitted to the transfer block 10 installed on the crossing road 3 side through the other pair of cables 11b of the transmission cable 11. The Number of the transfer cables 11 laid down between the crossing road 3 and the alarm start point is reduced. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multiplex train detection system for a railroad crossing that controls a railroad crossing device such as an alarm or a barrier provided at a railroad crossing, and more particularly to a multiplex system of train detection at a railroad crossing alarm starting point without laying a new cable. It is about.
[0002]
[Prior art]
[Patent Document 1] Japanese Unexamined Patent Application Publication No. 2002-104192 [Patent Document 2] Japanese Unexamined Patent Application Publication No. 2002-274375 A railroad crossing warning device of a railway safety device takes a railroad crossing a predetermined time before a train traveling on a track passes a railroad crossing road. A warning is started, the traffic on the level crossing is cut off, and the safe operation of the train and the safety of cars and people passing on the level crossing are ensured. Road traffic is planned.
[0003]
As shown in the layout of the level crossing safety device in FIG. 6, a level crossing alarm device provided at a railroad crossing to perform this level crossing alarm control is located at an appropriate distance from the level crossing 3, for example, a few hundred meters ahead. A closed-circuit-type railroad crossing controller 4 is provided at the warning start point of the track 2, and an open-circuit-type railroad crossing controller 8 is provided at the warning end point behind the railroad crossing 3 to form a railroad crossing warning section. The railroad crossing controller 4 and the railroad crossing controller 9 provided near the railroad crossing 3 are connected via the transmission cable 11 laid between the alarm start point and the railroad crossing 3, and the railroad crossing controller 9 The power supply voltage protected from power failure is supplied to the railroad crossing controller 4, and a train detection signal is transmitted from the railroad crossing controller 4 to the railroad crossing control device 9. When the train 1 enters the control section of the railroad crossing controller 4, an alarm of the railroad crossing alarm 14 is started, the railroad crossing road 3 is closed after a predetermined time, and the train 1 crosses the railroad crossing controller 8 outside the control section. The warning of the alarm 14 is released, the door is opened, and the safety of people and vehicles passing through the crossing 3 is achieved.
[0004]
The transmission cable 11 provided between the railroad crossing controller 4 and the railroad crossing control device 9 provided at the alarm start point which is located at a distance of a hundred and a hundred meters from the railroad crossing road 3 includes a two-core cable 11a for power supply and a detection signal. It has a two-core cable 11b for transmission independently.
[0005]
In recent years, the number of vehicles passing through level crossings has been increasing with an increase in road traffic. When cars cross this railroad crossing, in order to prevent a collision accident between the car and the train, the cars are required to stop once immediately before the railroad crossing. Frequent. As one of the measures to alleviate this traffic congestion, a traffic signal is provided at a railroad crossing, and when the traffic signal is illuminated with a green light, it is necessary to temporarily omit the obligation to stop the vehicle and to make the flow of the vehicle smooth.
[0006]
When a traffic signal is provided at a level crossing in this way, a more reliable level crossing warning is required than before. For this reason, as shown in Patent Literature 1, a level crossing controller and a ground child that uses an ATS signal for train detection are provided at an alarm start point, and the train detection is configured as a redundant redundant system, thereby ensuring the reliability of train detection and the device. Improving reliability at the time of failure.
[0007]
[Problems to be solved by the invention]
However, in order to make the detection of the train at the alarm start point a redundant configuration with two or more systems, when a ground child is added separately from the railroad crossing controller, a cable that supplies the power supply voltage to the additional ground child, It is necessary to additionally lay a cable for transmitting a detection signal from a child or the like from an alarm start point to a railroad crossing, which is disadvantageous in that it costs a lot.
[0008]
To solve this disadvantage, as shown in Patent Document 2, the number of cables can be reduced by a method of frequency-division or time-division of the signals of the two train detection devices. It is very difficult to realize at cost. Moreover, it is practically impossible to divide the power supply voltage supplied to each train detection device by frequency division or time division.
[0009]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a multiplex train detection system for a railroad crossing that can improve such disadvantages and can realize a redundant configuration of a train detection device at an alarm start point with a simple configuration at a low cost. It is.
[0010]
[Means for Solving the Problems]
The multiplex train detection device for level crossing of the present invention is provided with a plurality of train detection devices at an alarm start point, supplies a power supply voltage to each train detection device from the level crossing side, and outputs a train detection signal output from each train detection device. In the multi-sequence car detection device for level crossing transmitting to the level crossing side, the transmission block provided on the level crossing side, the transmission block provided on the alarm starting point side, the transmission block provided on the level crossing side and the alarm starting point side A transmission cable for connecting the transmission block provided to the train detection device, and a DC and AC voltage supplied as a power supply voltage to each of the train detection devices is superimposed on the transmission block provided on the railroad crossing side to form a pair of transmission cables. The signal is transmitted to the transmission block provided on the alarm start point side via a cable, and the DC and AC train detection signals output from each train detection device are superimposed on the transmission block provided on the alarm start point side and the other transmission cable is superimposed. Characterized in that it transmits the transport block provided on the crossing road side via a pair of cables.
[0011]
Each of the transmission blocks has a superposition unit and a separation unit, and the superposition unit and the separation unit are configured by a transformer having three windings L1, L2, and L3 and a capacitance (capacitor), and a winding L1 of the transformer is provided. Independently constitutes an AC terminal for connecting AC input and output, the winding L2 and the winding L3 are connected in series via a capacitor C so as to have additional polarity, and the terminals at both ends of the capacitor C The terminals at both ends of the windings L2 and L3 form cable terminals for connecting a pair of transmission cables, and are superimposed units of transmission blocks provided on the railroad crossing side. DC and AC voltages supplied as power supply voltages to be supplied to each train detection device are superimposed, and the superimposed voltage is separated by a transmission block separation unit provided at the alarm start point side and supplied to each train detection device. The DC and AC train detection signals output from each train detection device are superimposed by the transmission block superimposition unit provided on the alarm start point side, and the superimposed train detection signal is superimposed by the transmission block separation unit provided on the railroad crossing side. To separate.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a layout diagram showing a configuration of a railroad crossing safety device of the present invention. As shown in the figure, a closed circuit type railroad crossing controller 4 that detects the train 1 is provided at an alarm start point that is, for example, several hundreds to several hundreds of meters ahead of the railroad crossing 3 of the track 2 on which the train 1 runs. A detector 6 connected to the loop coil 5 near the alarm start point; and a transmission block 7 connected to the railroad crossing controller 4 and the detector 6. Having. An open-circuit-type railroad crossing controller 8 for detecting the train 1 is provided at a warning end point behind the railroad crossing 3, and a railroad crossing control device 9 near the railroad crossing 3 and 1 connected to the railroad crossing control device 9 It has a pair of transmission blocks 10a and 10b. The transmission block 7 and one transmission block 10a are connected by a transmission cable 11 having a two-core cable 11a and a two-core cable 11b.
[0013]
The railroad crossing controller 4 and the detector 6 are supplied with the power supply voltage from the railroad crossing controller 9 via the transmission block 10a, the transmission cable 11 and the transmission block 7, and also transmit the detection signal to the transmission block 7, the transmission cable 11 and the transmission block. The signal is transmitted to the level crossing control device 9 via 10a. An AC voltage is supplied to the railroad crossing controller 4 as a power supply voltage, a DC voltage is supplied to the detector 6 as a power supply voltage, the railroad crossing controller 4 outputs a DC voltage signal as a detection signal, and the detector 6 An AC voltage signal is output as a signal.
[0014]
Each of the transmission blocks 7 and 10 has a superimposition unit 12 and a separation unit 13 as shown in the block diagram of the transmission system in FIG. The superimposing unit 12a of the transmission block 10a provided near the railroad crossing 3 and the separation unit 13b of the transmission block 7 provided near the alarm start point are connected by a two-core cable 11a of the transmission cable 11, and 7 and the separation unit 13a of the transmission block 10a are connected by a two-core cable 11b of the transmission cable 11. As shown in the circuit diagram of FIG. 3, the superimposing unit 12 and the separating unit 13 include a transformer T having three windings L1, L2, and L3 and a capacitance (capacitor) C. The winding L1 of the transformer T independently constitutes AC terminals A + and A- for connecting AC input and output, and the winding L2 and the winding L3 are connected in series via a capacitor C so as to be polarities. The terminals at both ends of the capacitor C constitute DC terminals D + and D- for connecting DC input / output, and the terminals at both ends of the windings L2 and L3 correspond to cable terminals C + and C- for connecting the transmission cable 11. Make up.
[0015]
The AC terminals A + and A- of the winding L1 of the superposition unit 12a provided in the transmission block 10a connected to the railroad crossing controller 9 are supplied from a battery 15 charged by a railroad crossing power supply 14 provided in the railroad crossing controller 9. The DC voltage supplied from the battery 15 is applied to the DC terminals D + and D− at both ends of the capacitor C. A DC voltage converted from, for example, DC24V to DC28V by the DC converter 17 is applied, and a two-core cable 11a of the transmission cable 11 is connected to cable terminals C + and C− at both ends of the windings L2 and L3. The other end of the cable 11a is connected to cable terminals C + and C- at both ends of the windings L2 and L3 of the separation unit 13b provided in the transmission block 7 on the alarm start point side. The AC terminals A + and A- of the winding L1 of the separation unit 13b are connected to the power supply terminal of the railroad crossing controller 4, and the DC terminals D + and D- at both ends of the capacitor C are connected to the DC / DC converter 18 of the detector 6. ing. The AC terminals A + and A− of the winding L1 of the superimposing unit 12b provided in the transmission block 7 are connected to the signal output terminals of the transmission unit (TX) 19 of the detector 6, and the DC terminals D + and D at both ends of the capacitor C. -Is connected to the signal output terminal of the railroad crossing controller 4, and the cable terminals C + and C- at both ends of the windings L2 and L3 are connected to the two-core cable 11b of the transmission cable 11. The other end of the cable 11b is connected to cable terminals C + and C− at both ends of the windings L2 and L3 of the separation unit 13a provided in the transmission block 10a connected to the railroad crossing control device 9. The AC terminals A + and A- of the winding L1 of the separation unit 13a are connected to the input terminals of a receiving unit (RX) 20 provided in the railroad crossing control device 9, and the DC terminals D + and D- at both ends of the capacitor C are connected to the railroad crossing control. It is connected to a train detection relay ADCR provided in the device 9.
[0016]
In this railroad crossing protection device, the AC voltage converted by the DC / AC converter 16 of the railroad crossing control device 9 is applied to the AC terminals A + and A− of the winding L1 of the transformer T of the superposition unit 12a, and the DC / DC conversion is performed. The DC voltage converted by the unit 17 is applied to DC terminals D + and D− across the capacitor C. The DC voltage applied to the DC terminals D + and D- is subjected to ripple removal by the capacitor C, and is output to the cable terminals C + and C- through the winding L2 and the winding L3. Although a direct current flows through the windings L2 and L3, since the current is direct current, there is no need to affect the winding L1. On the other hand, the AC voltage applied to AC terminals A + and A- is transmitted from winding L1 of transformer T to windings L2 and L3 by electromagnetic coupling. Here, since the capacitor C acts as a small reactance (resistance component) with respect to the alternating current, the winding L2 and the winding L3 with respect to the alternating current are equivalent to being connected in series. A secondary voltage corresponding to the winding ratio of L2 and L3 is superimposed on the DC voltage and appears between the cable terminals C + and C-. The superimposed voltage is transmitted to the separation unit 13b of the transmission block 7 through the cable 11a.
[0017]
By this power transmission, a voltage in which an AC voltage and a DC voltage are superimposed is supplied to the cable terminals C + and C− of the separation unit 13b. The DC voltage supplied to the cable terminals C + and C− is supplied as DC power supply voltage to the DC / DC converter 18 of the detector 6 from the DC terminals D + and D− at both ends of the capacitor C. At this time, the capacitor C connected between the windings L2 and L3 operates as a smoothing capacitor. The AC voltage supplied to the cable terminals C + and C- excites the windings L2 and L3 and induces a secondary voltage in the winding L1. The induced secondary voltage is supplied as a power supply voltage to the railroad crossing controller 4 from the AC terminals A + and A−.
[0018]
As described above, the AC voltage and the DC voltage are superimposed by the superimposing unit 12a of the transmission block 10a connected to the railroad crossing control device 9, and the superimposed voltage is transmitted to the separation unit 13b of the transmission block 7 through the two-core cable 11a. Since the unit 13b separates the AC voltage and the DC voltage, the railroad crossing controller 4 and the loop coil 5 are provided at the railroad crossing start point, and even if the train detection is performed in a double system, different power supply is performed using the two-core cable 11a. Voltage can be supplied.
[0019]
In addition, the train detection signal of the AC signal output from the transmission unit (TX) 19 of the detector 6 connected to the loop coil 5 is connected to the AC terminals A +, A + of the winding L1 of the transformer T of the superposition unit 12b of the transmission block 7. A-, the train detection signal of the DC signal of the railroad crossing controller 4 is applied to DC terminals D +, D- at both ends of the capacitor C. The DC voltage applied to the DC terminals D + and D- is subjected to ripple removal by the capacitor C, and is output to the cable terminals C + and C- through the winding L2 and the winding L3. On the other hand, the power is transmitted from the AC terminals A +, A- to the windings L1, L2, L3 by electromagnetic coupling, and the secondary voltage is superimposed on the DC voltage and appears between the cable terminals C +, C-. The superimposed voltage is transmitted to the separation unit 13a of the transmission block 10a connected to the railroad crossing controller 9 via the cable 11b.
[0020]
By this power transmission, a train detection signal in which AC and DC are superimposed is transmitted to the cable terminals C + and C- of the separation unit 13a. The DC train detection signals sent to the cable terminals C + and C− are sent from the DC terminals D + and D− at both ends of the capacitor C to the train detection relay ADCR of the railroad crossing control device 9. Further, the windings L2 and L3 are excited by the AC train detection signal sent to the cable terminals C + and C-, and a secondary voltage is induced in the winding L1. The train detection signal based on the induced secondary voltage is sent to the processor 21 via the reception unit (RX) 20 of the railroad crossing control device 9 to control the operation of the train detection relay ADCR1.
[0021]
As described above, the DC and AC train detection signals output from the railroad crossing controller 4 and the loop coil 5 provided at the railroad crossing start point are superimposed and sent out by the superimposing block 12b. An AC train detection signal can be sent to the separation unit 13a of the transmission block 10a connected to the railroad crossing control device 9. Further, by separating the sent DC and AC train detection signals by the separation unit 13a, the operations of the train detection relay ADCR and the train detection relay ADCR1 can be controlled in parallel.
[0022]
In this railroad crossing safety device, when the train 1 to be detected reaches the alarm start point and the railroad crossing controller 4 detects the train 1, the DC output of the railroad crossing controller 4 becomes 0 V, and this train detection signal is transmitted to the railroad crossing controller 9. To restore the train detection relay ADCR, open the contacts, and output the presence of a train. Further, when the train 1 is detected by the loop coil 5, the frequency of the AC signal output from the transmission unit (TX) 19 changes, and this change is measured by the processor 21, and the train detection relay ADCR1 is restored to restore the train. Outputs presence. When the signal indicating that there is a train output from the railroad crossing controller 4 and the loop coil 5 matches, the railroad crossing controller 9 starts the warning of the railroad crossing alarm 14 and closes the railroad crossing road 3 after a predetermined time, and the train 1 When the vehicle goes out of the control section of the railroad crossing controller 8, the warning of the railroad crossing alarm 14 is released, the door is opened, and the safety of people and vehicles passing the railroad crossing road 3 is achieved.
[0023]
In the above description, the case where the level crossing controller 4 for detecting the train 1 and the loop coil 5 are provided at the alarm start point has been described. However, as shown in the layout diagram of FIG. A ground train 15 for receiving the coil 5 and the ATS signal may be provided, and a backup train detector (closed circuit type) 16 may be provided near the alarm start point. The backup train detector (closed circuit type) 16 has an AC power supply as a power supply, and outputs a DC voltage for driving the output relay BUR as a train detection output. Since the AC power supply of the backup train detector (closed circuit type) 16 has low power consumption, a part of the AC voltage supplied to the railroad crossing controller 4 from the winding L1 of the separation unit 13b can be used.
[0024]
When three types of train detection devices are provided at the alarm start point in this way, when the train 1 reaches the alarm start point and detects the train 1 with the railroad crossing controller 4, the DC output of the railroad crossing controller 4 becomes 0 V, This train detection signal is sent to the railroad crossing control device 9 to restore the train detection relay ADCR, open the contacts, and output the presence of a train. When the ground 1 detects the train 1, the backup detector (closed circuit type) 16 restores the output relay BUR to open the contact, and operates according to the train detection signal output from the railroad crossing controller 4. The relay ADCR is restored and there is a train. Further, when the train 1 is detected by the loop coil 5, the frequency of the AC signal output from the transmission unit 19 changes. This change is measured by the processor 21 and the train detection relay ADCR1 is restored to output the presence of a train. I do.
[0025]
In this way, the grounding element 15 is provided at the alarm starting point, and the output signal of the backup train detector (closed circuit type) 16 backs up the train detection signal output from the railroad crossing controller 4 so that, for example, when the rail tread leaves fall off, etc. Even when the railroad crossing controller 4 cannot detect a train, the backup train detector (closed circuit type) 16 outputs a train detection signal when the ATS signal from the train 1 is received by the ground child 15, so that the train 1 is an alarm start point. Can be reliably detected.
[0026]
In the above description, a case has been described in which the DC and AC power supply voltages are superimposed and transmitted using the two-core cable 11a, and the DC and AC train detection signals are superimposed and transmitted using the two-core cable 11b. These combinations can be arbitrarily and appropriately combined according to the capacity of the power supply, the level of the frequency, and the like. In the above description, only the level crossing alarm start point has been described, but the present invention can be similarly applied to a case where a level crossing alarm end point is configured in a multiplex system.
[0027]
【The invention's effect】
As described above, the present invention superimposes DC and AC voltages, which are supplied as power supply voltages to a plurality of train detection devices provided at an alarm start point, on a transmission block provided on a railroad crossing side to form a pair of transmission cables. To the transmission block provided on the alarm start point side, and superimpose the DC and AC train detection signals output from each train detection device on the transmission block provided on the alarm start point side. The transmission is performed to the transmission block provided on the railroad crossing side via the pair of cables described above, so that the number of transmission cables laid between the railroad crossing and the alarm start point can be reduced.
[0028]
In addition, the existing transmission cable can be used even if a plurality of train detection devices are provided at the alarm start point, and there is no need to lay additional transmission cables when providing multiple train detection devices at the alarm start point. Costs can be significantly reduced.
[0029]
Further, each transmission block has a superposition unit and a separation unit, and the superposition unit and the separation unit are configured by a transformer having three windings L1, L2, and L3 and a capacitance (capacitor), and the windings of the transformer are formed. L1 independently constitutes an AC terminal for connecting an AC input / output, and the winding L2 and the winding L3 are connected in series via a capacitor C so as to have an additional polarity. DC terminals for connecting DC input and output are configured, terminals at both ends of the windings L2 and L3 are configured as cable terminals for connecting a pair of transmission cables, and a transmission block superimposing unit provided on a railroad crossing side. The DC and AC voltages supplied as the power supply voltage to be supplied to each train detection device are superimposed, and the superimposed voltage is separated by the transmission block separation unit provided on the alarm start point side, and the superimposed voltage is applied to each train detection device. Train detection signals output from each train detection device are superimposed on the DC and AC train detection signals by the transmission block superposition unit provided on the alarm start point side, and superimposed by the transmission block separation unit provided on the railroad crossing side By separating the signals, DC and AC can be superimposed and transmitted with a simple configuration, and the superposed DC and AC can be separated.
[Brief description of the drawings]
FIG. 1 is a layout diagram showing a configuration of a railroad crossing safety device of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a transmission system.
FIG. 3 is a circuit diagram illustrating a configuration of a superposition unit and a separation unit.
FIG. 4 is a layout diagram showing a configuration of another railroad crossing safety device of the present invention.
FIG. 5 is a block diagram showing a configuration of another transmission system.
FIG. 6 is a layout diagram showing a configuration of a conventional railroad crossing safety device.
[Explanation of symbols]
1; train 2; track 3; railroad crossing 4; railroad crossing controller 5; loop coil
6; detector; 7; transmission block; 8; level crossing controller; 9; level crossing control device;
10: transmission block, 11: transmission cable, 12: superposition unit,
13; separation unit, 14; railroad crossing alarm, 15;
16; Backup train detector (closed circuit type), T; Transformer,
L1, L2, L3: winding, C: capacitor.

Claims (2)

Multiple train detectors are installed at the alarm start point, a power supply voltage is supplied to each train detector from the railroad crossing side, and a train detection signal output from each train detector is transmitted to the railroad crossing side. In the device,
A transmission block provided on the railroad crossing side, a transmission block provided on the alarm start point side, and a transmission cable connecting the transmission block provided on the railroad crossing side and the transmission block provided on the alarm start point side,
The DC and AC voltages supplied as power supply voltages to the respective train detection devices are superimposed on the transmission block provided on the railroad crossing side and transmitted to the transmission block provided on the alarm start point side via a pair of transmission cables. The DC and AC train detection signals to be transmitted and output from each train detection device are superimposed on the transmission block provided on the alarm start point side, and the transmission is provided on the railroad crossing side via another pair of transmission cables. A multiplex train detection device for railroad crossings, which is transmitted to a block. Each of the transmission blocks has a superposition unit and a separation unit, and the superposition unit and the separation unit are configured by a transformer having three windings L1, L2, and L3 and a capacitance (capacitor), and the winding L1 of the transformer is formed. Independently constitutes an AC terminal for connecting AC input and output, the winding L2 and the winding L3 are connected in series via a capacitor C so as to have additional polarity, and the terminals at both ends of the capacitor C 2. The multi-series car detecting device for a railroad crossing according to claim 1, wherein a DC terminal for connecting the input and output of the transmission line is formed, and terminals at both ends of the windings L2 and L3 form a cable terminal for connecting a pair of transmission cables.

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