JP4127384B2 - Multi-train detection system for railroad crossings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multiple train detection system for a railroad crossing that controls a railroad crossing device such as an alarm or a breaker provided at a railroad crossing, and more particularly, a train detection multiple system at a railroad crossing alarm starting point without laying a new cable. It is about.
[0002]
[Prior art]
[Patent Document 1]
JP 2002-104192 A [Patent Document 2]
JP, 2002-274375, A Railroad crossing warning device of a railroad safety device starts a railroad crossing warning a certain time before a train traveling on a track passes through a railroad crossing, shuts off traffic on the railroad crossing, and operates the train safely. In order to ensure the safety of cars and people passing through the railroad crossing, after the train crosses the railroad crossing, the road block is quickly released to ensure smooth road traffic.
[0003]
As shown in the layout diagram of the railroad crossing safety device in FIG. 6, the railroad crossing warning device provided at the railroad crossing for performing the railroad crossing warning control is an appropriate distance from the railroad crossing road 3, for example, a few hundreds of meters. A railroad crossing controller 4 is provided at the alarm start point of the track 2, and an open circuit railroad crossing controller 8 is provided at the alarm end point behind the railroad crossing 3 to constitute a railroad crossing alarm section. The railroad crossing controller 4 and the railroad crossing control device 9 provided in the vicinity of the railroad crossing 3 are connected via a transmission cable 11 laid between the alarm start point and the railroad crossing road 3. The railroad crossing controller 4 is supplied with a power supply voltage that is protected from power failure, and a train detection signal is transmitted from the crossing controller 4 to the crossing controller 9. When the train 1 enters the control section of the level crossing controller 4, the level crossing alarm 14 is started and the level crossing 3 is closed after a predetermined time, and when the train 1 moves outside the control section of the level crossing controller 8. The alarm of the alarm device 14 is released and the door is opened to ensure the safety of people and vehicles passing through the railroad crossing 3.
[0004]
The transmission cable 11 provided between the level crossing controller 4 and the level crossing control device 9 provided at the alarm start point separated from the level crossing 3 by a few hundreds of meters is a two-core cable 11a for power supply and a detection signal. Each has a two-core cable 11b for transmission.
[0005]
In recent years, the number of automobiles passing through a railroad crossing is increasing with an increase in road traffic. When a car passes through this level crossing, in order to prevent a collision accident between the car and the train, the car is required to stop immediately before the level crossing. It occurs frequently. As one of the alleviation of traffic congestion, a traffic signal is provided at the railroad crossing, and when the traffic signal lights a green light, the duty of stopping is temporarily omitted to smooth the flow of automobiles.
[0006]
Thus, when a traffic signal is provided at a level crossing, a more reliable level crossing warning is required than before. For this reason, as shown in Patent Document 1, a train crossing controller and an ATS signal used for train detection are provided at the alarm start point, and train detection is made redundant with a redundant system, and train detection reliability and equipment We are trying to improve the reliability in case of failure.
[0007]
[Problems to be solved by the invention]
However, in order to make the train detection at the alarm start point redundant structure more than double system, when adding a ground element etc. separately from the level crossing controller, a cable for supplying power voltage to the added ground element, etc. It is necessary to additionally lay a cable for transmitting a detection signal from a child or the like from the alarm start point to the railroad crossing, and there is a disadvantage that it is very expensive.
[0008]
In order to eliminate this disadvantage, as shown in Patent Document 2, the number of cables can be reduced by a frequency division method or a time division method for signals of two sets of train detection devices. It is very difficult to realize at cost. In addition, it is practically impossible to realize the power supply voltage supplied to each train detection device by frequency division or time division.
[0009]
An object of the present invention is to provide a multi-train detection system for railroad crossings that can improve such disadvantages and can realize a redundant configuration of a train detection device at a warning start point with a simple configuration at low cost. It is.
[0010]
[Means for Solving the Problems]
The multi-train vehicle detection device for a railroad crossing according to the present invention has a train detection device that inputs an AC voltage as a power supply voltage and outputs a train detection signal of a DC voltage, and a DC voltage as a power supply voltage. A train detection device that outputs a train detection signal of AC voltage, for supplying power to the train detection device from the railroad crossing side, and for transmitting the train detection signal output from each train detection device to the railroad crossing side In the multi-series vehicle detection device, a transmission block provided on the railroad crossing side, a transmission block provided on the alarm start point side, a transmission block provided on the railroad crossing side, and a transmission block provided on the alarm start point side are connected. a transmission cable, wherein each transmission block has a a superimposing unit separation unit superimposing unit and the separation unit, a transformer and capacitance (Con having three windings L1, L2, L3 Constituted by capacitor), the transformer first winding L1 of independently configure the AC terminals for connecting the input and output of the AC, and the second winding L2 third winding L3 is a capacitor C The terminals of both ends of the capacitor C constitute a DC terminal for connecting DC input / output, and terminals of both ends of the second winding L2 and the third winding L3. Constitutes a cable terminal for connecting a pair of transmission cables, and the transmission block superimposing unit provided on the railroad crossing side superimposes the DC and AC power supply voltages to be supplied to the respective train detection devices. The data is transmitted to a transmission block separation unit provided on the alarm start point side via a pair of cables, and the transmission block separation unit provided on the alarm start point side separates the transmitted power supply voltage into direct current and alternating current, and Supply to each train detection device, alarm start point The transmission block superimposing unit provided on the side superimposes the DC and AC train detection signals output from the respective train detection devices and transmits the transmission block provided on the railroad crossing side via another pair of cables. The transmission unit is transmitted to the separation unit and the separation unit of the transmission block provided on the railroad crossing side separates the transmitted train detection signal into a direct current and an alternating current and outputs the separated train detection signal.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a layout view showing the structure of a railroad crossing safety device according to the present invention. As shown in the figure, a closed-circuit type railroad crossing controller 4 for detecting the train 1 is provided at an alarm start point just before the railroad crossing 3 of the track 2 on which the train 1 travels, for example, several hundred m to several thousand m. A loop coil 5 provided in the gap along the track 2 is provided. In the vicinity of the alarm start point, a detector 6 connected to the loop coil 5 and a crossing controller 4 and a transmission block 7 connected to the detector 6 Have At the alarm end point behind the railroad crossing 3, there is an open-circuit type railroad crossing controller 8 that detects the train 1, and in the vicinity of the railroad crossing 3, a railroad crossing control device 9 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 crossing controller 4 and the detector 6 are supplied with a power supply voltage from the crossing control device 9 via the transmission block 10a, the transmission cable 11 and the transmission block 7, and transmit the detection signal to the transmission block 7, the transmission cable 11 and the transmission block. This is transmitted to the crossing control device 9 via 10a. The crossing controller 4 is supplied with an AC voltage as a power supply voltage, the detector 6 is supplied with a DC voltage as a power supply voltage, the level crossing controller 4 outputs a DC voltage signal as a detection signal, and the detector 6 is detected. An AC voltage signal is output as a signal.
[0014]
The transmission blocks 7 and 10 have a superposition unit 12 and a separation unit 13 as shown in the block diagram of the transmission system in FIG. The superposition unit 12a of the transmission block 10a provided in the vicinity of the railroad crossing 3 and the separation unit 13b of the transmission block 7 provided in the vicinity of the alarm start point are connected by a two-core cable 11a of the transmission cable 11, and the transmission block 7 and the separation unit 13 a of the transmission block 10 a are connected by a two-core cable 11 b of the transmission cable 11. As shown in the circuit diagram of FIG. 3, the superposition unit 12 and the separation 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 serially connected to each other through a capacitor C so as to have an additional polarity. 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 are cable terminals C + and C− for connecting the transmission cable 11. It is composed.
[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 level crossing control device 9 are supplied from the battery 15 charged by the level crossing power source 14 provided in the level crossing control device 9. An AC voltage obtained by converting the DC voltage to be converted into a rectangular wave of 400 Hz at, for example, AC 200 V by the DC / AC converter 16 is applied, and the DC voltage supplied from the battery 15 is supplied to the DC terminals D + and D− at both ends of the capacitor C. A DC voltage converted into, 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 the cable terminals C + and C− at both ends of the windings L2 and L3. The other end of the cable 11a is connected to the 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 superposition 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 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 two-core cable 11b of the transmission cable 11 is connected to the cable terminals C +, C- at both ends of the windings L2, L3. 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 terminal of the receiving unit (RX) 20 provided in the crossing control device 9, and the DC terminals D + and D− at both ends of the capacitor C are crossing control. It is connected to a train detection relay ADCR provided in the device 9.
[0016]
In this level crossing safety device, the AC voltage converted by the DC / AC converter 16 of the level crossing control device 9 is applied to the AC terminals A + and A− of the winding L1 of the transformer T of the superimposing unit 12a, and DC / DC conversion is performed. The DC voltage converted by the device 17 is applied to DC terminals D + and D− at both ends of the capacitor C. The DC voltage applied to the DC terminals D + and D− is removed by the capacitor C, and is output to the cable terminals C + and C− through the winding L2 and the winding L3. A direct current flows through the windings L2 and L3. However, since the direct current is direct current, the winding L1 side is not affected. On the other hand, the AC voltage applied to the AC terminals A + and A− is transmitted from the winding L1 of the transformer T to the 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 are equivalent to being connected in series with respect to the alternating current, and the winding L1 and the winding 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 a DC power supply voltage from the DC terminals D + and D− at both ends of the capacitor C to the DC / DC converter 18 of the detector 6. 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 from the AC terminals A + and A− to the crossing controller 4.
[0018]
Thus, the superposition unit 12a of the transmission block 10a connected to the railroad crossing control device 9 superimposes the AC voltage and the DC voltage, and transmits the superposed voltage 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, even if the railroad crossing controller 4 and the loop coil 5 are provided at the railroad crossing start point and the train detection is a double system, different power sources are used by using the two-core cable 11a. A voltage can be supplied.
[0019]
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 the AC terminal A + of the winding L1 of the transformer T of the superposition unit 12b of the transmission block 7. The train detection signal of the DC signal of the level crossing controller 4 is applied to A− and applied to the DC terminals D + and D− at both ends of the capacitor C. The DC voltage applied to the DC terminals D + and D− is removed 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 AC terminals A + and A− are transmitted by electromagnetic coupling from the winding L1 to the windings L2 and L3, and the secondary voltage is superimposed on the DC voltage and appears between the cable terminals C + and C−. This superimposed voltage is transmitted to the separation unit 13a of the transmission block 10a connected to the railroad crossing control device 9 through the cable 11b.
[0020]
By this power transmission, a train detection signal in which alternating current and direct current are superimposed is sent 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 crossing control device 9. Further, the windings L2 and L3 are excited by an AC train detection signal sent to the cable terminals C + and C−, and a secondary voltage is induced in the winding L1. A train detection signal based on the induced secondary voltage is sent to the processor 21 via the receiving unit (RX) 20 of the crossing control device 9 to control the operation of the train detection relay ADCR1.
[0021]
In this way, since 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 superposed and sent out by the superposition block 12b, the two-core cable 11b is used to generate the direct current. 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. Moreover, the operation | movement of the train detection relay ADCR and the train detection relay ADCR1 can be controlled in parallel by isolate | separating the sent DC and AC train detection signal with the separation unit 13a.
[0022]
In this level crossing safety device, when the train 1 to be detected reaches the alarm start point and the train 1 is detected by the level crossing controller 4, the DC output of the level crossing controller 4 becomes 0V, and this train detection signal becomes the level crossing control device 9. The train detection relay ADCR is restored, the contact is opened, and a train is output. In addition, 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 to restore the train detection relay ADCR1. Outputs yes. When the train presence signal output by the level crossing controller 4 and the loop coil 5 coincides, the level crossing control device 9 starts the alarm of the level crossing alarm device 14 and closes the level crossing road 3 after a predetermined time. When the railroad crossing controller 8 moves outside the control section, the warning of the railroad crossing alarm 14 is released and the door is opened, so that the safety of people and vehicles passing through the railroad crossing 3 is ensured.
[0023]
In the above description, the case where the railroad 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 element 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 in the vicinity of the alarm start point. This backup train detector (closed circuit type) 16 has an AC power source as a power source, and outputs a DC voltage for driving the output relay BUR as a train detection output. Since the AC power supply of this backup train detector (closed circuit type) 16 has low power consumption, a part of the AC voltage supplied from the winding L1 of the separation unit 13b to the railroad crossing controller 4 can be used.
[0024]
Thus, when three types of train detection devices are provided at the alarm start point, when the train 1 reaches the alarm start point and the train 1 is detected by the level crossing controller 4, the DC output of the level crossing controller 4 becomes 0V. This train detection signal is sent to the railroad crossing control device 9, the train detection relay ADCR is restored, the contact is opened, and a train is output. When the ground element 15 detects the train 1, the backup detector (closed circuit type) 16 restores the output relay BUR, opens the contact, and detects the train operated by the train detection signal output from the level 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 transmitter 19 changes, and this change is measured by the processor 21 and the train detection relay ADCR1 is restored to output that there is a train. To do.
[0025]
Thus, by providing the ground element 15 at the alarm start point and backing up the train detection signal output from the level crossing controller 4 by the output signal of the backup train detector (closed circuit type) 16, for example, in the fallen leaves of the rail tread Even if the railroad crossing controller 4 cannot detect the train, when the ground unit 15 receives the ATS signal from the train 1, the backup train detector (closed circuit type) 16 outputs the train detection signal. Can be reliably detected.
[0026]
In the above description, 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 combined arbitrarily and appropriately depending on the capacity of the power supply, the frequency level, and the like. In the above description, only the railroad crossing alarm start point has been described, but the present invention can be similarly applied to a case where a railroad crossing alarm end point is configured as a multiple system.
[0027]
【The invention's effect】
As described above, according to the present invention, a pair of transmission cables is configured by superimposing DC and AC voltages supplied as power supply voltages to a plurality of train detection devices provided at an alarm start point in a transmission block provided on a railroad crossing side. To the transmission block provided on the alarm start point side, 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. Since the transmission is made to the transmission block provided on the railroad crossing side through the pair of cables, the number of transmission cables laid between the railroad crossing and the alarm start point can be reduced.
[0028]
In addition, even if multiple train detection devices are installed at the alarm start point, the existing transmission cable can be used, and when multiple train detection devices are installed at the alarm start point, there is no need to install additional transmission cables. Costs can be greatly reduced.
[0029]
Furthermore, each transmission block has a superimposing unit and a separating unit. The superposing unit and the separating unit are composed of a transformer having three windings L1, L2, and L3 and a capacitance (capacitor), and the winding of the transformer. L1 independently constitutes an AC terminal for connecting AC input and output. The winding L2 and the winding L3 are connected in series through the capacitor C so as to be polar, and terminals at both ends of the capacitor C are connected to each other. A DC terminal for connecting DC input / output, and terminals at both ends of the windings L2, L3 constitute a cable terminal for connecting a pair of cables of the transmission cable, and a transmission block overlapping unit provided on the railroad crossing side The DC and AC voltages supplied as power supply voltages to each train detection device are superimposed on each other, and the superimposed voltage is separated by the transmission block separation unit provided on the alarm start point side, and supplied to each train detection device. Train detection signals that are superimposed on the transmission block superimposing unit provided on the alarm start point side and superimposed on the transmission block separating unit provided on the railroad crossing side. By separating the direct current and the alternating current, the direct current and the alternating current can be transmitted with a simple configuration, and the superimposed direct current and the alternating current can be separated.
[Brief description of the drawings]
FIG. 1 is a layout view showing a configuration of a railroad crossing safety device according to the present invention.
FIG. 2 is a block diagram showing a configuration of a transmission system.
FIG. 3 is a circuit diagram showing a configuration of a superposition unit and a separation unit.
FIG. 4 is a layout view showing the configuration of another level crossing safety device of the present invention.
FIG. 5 is a block diagram showing the configuration of another transmission system.
FIG. 6 is a layout view 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; Railroad crossing controller, 9; Railroad 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 (1)

At the alarm start point, a train detection device that inputs an AC voltage as a power supply voltage and outputs a DC voltage train detection signal, and a train detection device that inputs a DC voltage as a power supply voltage and outputs an AC voltage train detection signal In the multi-series vehicle detection device for railroad crossings that supplies a power supply voltage from the railroad crossing side to each train detection device and transmits a train detection signal output from each train detection device to the railroad crossing side,
It has a transmission cable connecting the transmission block provided on the railroad crossing side, the transmission block provided on the alarm starting point side, the transmission block provided on the railroad crossing side and the transmission block provided on the alarm starting point side,
Each of the transmission blocks includes a superimposing unit and a separating unit, and the superposing unit and the separating unit include a transformer having three windings L1, L2, and L3 and a capacitance ( capacitor ) . Winding L1 independently constitutes an AC terminal for connecting AC input / output, and the second winding L2 and the third winding L3 are connected in series via the capacitor C so as to be of a positive polarity. The terminals at both ends of the capacitor C constitute a DC terminal for connecting DC input / output, and the terminals at both ends of the second winding L2 and the third winding L3 connect a pair of cables of the transmission cable. Configure cable terminals,
The superimposing unit of the transmission block provided on the railroad crossing side superimposes the DC and AC power supply voltages supplied to each train detection device, and transmits the transmission block provided on the alarm starting point side through a pair of transmission cables. Transmit to the separation unit, the separation unit of the transmission block provided on the alarm start point side separates the transmitted power supply voltage into direct current and alternating current and supplies each train detection device,
The transmission block superimposing unit provided on the alarm start point side superimposes the DC and AC train detection signals output from each train detection device and is provided on the railroad crossing side via another pair of cables of the transmission cable. A multi-series vehicle detection device for level crossings, which transmits to a separation unit of a transmission block, and the transmission block separation unit provided on the side of the railroad crossing outputs the train detection signal separated into direct current and alternating current.

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