JP2945172B2 - Track circuit for remote monitoring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track circuit for remote monitoring, and more particularly to a track circuit for detecting a train remotely and also having a failure monitoring function, for example, based on a train detection output detected from a distance. The present invention relates to a device that can be used as a start controller for starting a level crossing device such as a circuit breaker or an alarm device.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional railroad crossing controller (abbreviated as type 3 or OS3) (JRS standard JRS2).
It is a schematic block diagram of a railroad crossing control apparatus concerning (established in 2507-1). The railroad crossing control device of this railroad crossing controller type is a railroad crossing Y
A predetermined position of the outer rail R, for example,
Starting controller element for starting the crossing equipment Z consisting of alarm Z ₁ and breaker Z ₂ to start detection point X ₁ apart 1.5 km (hereinafter referred Shidoko) provided with a A, railroad crossing Y
End detection point X ₂ of the position of rail R about 20 m on the approach side of
At the end of the railroad crossing device Z is provided.

[0003] The starter A is constituted by a kind of track circuit. In other words, start the sending end i of the rail R of detection points X ₁ while connecting the transmitting A ₁ of the oscillator A _0, the oscillation signal from a predetermined distance (e.g. 15 m) apart receiving end B from the sending end i connect to the receiver a ₂ parts a ₀ to form an oscillation circuit of a predetermined frequency, relay C by its oscillation output
TR is operated. Therefore, when the axle of the train T short-circuits the rail R, the relay CTR that has been held in the ON (lifting) state is turned OFF (falls). Then, the starting relay CTRR is dropped to start the level crossing device Z. The driving circuit of the starting relay CTRR is a signal cable laid between a part of the pair of power supply cables K ₁ and K ₂ for supplying power to the starter A from the level crossing Y side and the starter A and the level crossing Y. It is composed of a K _3.

[0004] In the terminal B, a transmitting section B ₁ for transmitting a signal of a predetermined frequency and a receiving section B ₂ are connected in series via a rail R. Therefore, the axle of the train T is transmitted and received by the transmitting and receiving units B ₁ ,
Upon reaching the connection portion of the B _2, and ON the Tsuido relay OTR receiver B ₂ is to input signals from the transmitting unit B _1. When the end relay OTR is turned on, the railroad crossing device Z that has been started can be stopped.

[0005]

However, the above-mentioned conventional track circuit is designed to monitor whether or not the train detection function is operating normally only by transmitting the train detection signal to a distant place. Could not. For example, in the case of the above-described starter A, since there is no failure monitoring function, even if a failure occurs on the fail-safe side, the railroad crossing device Z is started even when the train T does not arrive, and the failure occurs on road traffic. There was a risk that this would cause obstacles and reduce the reliability of level crossing users. Also, two cables K for supplying power to the starter A
₁ , K ₂ and one cable K ₃ for starting relay CTRR
, The start relay CTRR does not turn off,
There was also a risk of fail-safe operation.

In order to prevent the above-mentioned inconvenience caused by the cross-contact, two cables are separately provided for the starting relay CTRR separately from the power cable, and the power supply is set to an AC high voltage. ON
Although some attempts have been made to prevent the cable from being left as it is, there is a drawback that the number of cables is increased from three to four and the facility construction cost increases. In particular, cable installation costs are higher than control equipment, and it has been desired to reduce the number of cables. Further, the power supply to the starter A at a distance of 1 to 1.5 km from the railroad crossing Y has a large voltage drop, and the stable operation of the starter cannot be performed. Therefore, power is supplied at a high voltage and a low current. High voltage supply caused noise to other lines.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a remote monitoring track capable of stably transmitting a train detection signal to a remote location and having a failure monitoring function. It is to provide a circuit.

[0008]

In order to achieve the above object, a track circuit for distant monitoring according to the present invention comprises: signal transmitting means for transmitting a signal of a predetermined frequency to a power transmitting end of a rail constituting the track circuit; Voltage detecting means for detecting an incoming voltage at a power receiving end of the rail; current detecting means for detecting a transmission current at a power transmitting end of the rail; and synthesizing means for synthesizing an output of the current detecting means and an output of the voltage detecting means. Transmitting means for transmitting a signal synthesized by the synthesizing means; first detecting means for detecting a signal component detected by the voltage detecting means from the synthesized signal transmitted by the transmitting means; and A second detection unit for detecting a signal component detected by the current detection unit from the transmitted combined signal; and a detection output from the first detection unit and the detection output of the second detection unit. Monitoring means, wherein the monitoring means determines that the train detection function of the track circuit is normal when the detection output of the first detection means and the detection output of the second detection means satisfy a logical sum condition. It is characterized by determining.

[0009]

In the above arrangement, when a signal is transmitted from the signal transmitting means to the power transmitting end of the rail of the track circuit, the current detecting means detects the transmission current at the power transmitting end, and the voltage detecting means detects the incoming voltage from the power receiving end of the rail. Is detected. These two detection signals are combined by the combining means, and the combined signal is sent to the distant place via the transmission means. The signal component corresponding to the incoming voltage in the composite signal sent to the distant place is detected by the first detecting means, and the signal component corresponding to the transmission current is detected by the second detecting means. The monitoring means determines that the train detection function of the track circuit is normal when there is a logical sum of the outputs of the two detection means. If there is no failure in the track circuit, one of the first and second detection means always outputs a detection output. In addition,
The output of the first detection means has a CT (closed circuit track circuit) train detection function, and the output of the second detection means has an OT (open circuit track circuit) train detection function.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a track circuit for distant monitoring according to the present invention is applied to a starter of a railroad crossing control device will be described below with reference to the drawings. Note that the same components as those in the conventional device of FIG. FIG. 1A shows a starter A.
Starting a schematic configuration of a detection point X ₁ side, also in FIG. 1 (2)
Shows a schematic configuration of the starter A on the level crossing Y side. The present embodiment is applied to a short track circuit for a railroad crossing, and a signal transmitted from a transmitting end of the track circuit has a frequency sufficiently high to reach only near the transmitting end (for example, 15 m). It is intended to be used.

The starter has a terminal ₁ on the start detection point X1 side, and has a central unit 2 on the level crossing Y side, and transformers provided between the terminal 1 and the central unit 2 are provided respectively. 3,4
And three cables L ₁ , L ₂ , L ₃ laid between the transformers 3, 4.

The cables L ₁ and L ₂ connect the secondary side of the transformer 3 of the terminal 1 and the primary side of the transformer 4 of the central unit 2 to constitute signal transmission means. The cable L ₃ connects one pole of the DC power supply 5 of the central unit 2 to one pole of the power supply circuit A ₄ of the terminal 1. The other pole of the DC power supply 5 is
The neutral point of the primary side of the transformer 4 of the central unit 2 and the cable L ₁
And and L _2, are connected to the other pole of the power source circuit portion A ₄ of the terminal 1 via the secondary-side neutral point of the terminal _1. Accordingly, DC power is supplied to the power supply circuit section A ₄ from the railroad crossing Y side using the cable L ₃ and the communication cables L ₁ and L _{2 of the} terminal 1 and the central unit 2.

The terminal 1 includes a transmitting unit A ₁ and a first receiving unit A
_2, a second receiving unit A _3, has a synthesizer consisting of trans 22,39,3, and a power supply circuit portion A _4.

The transmitting section A ₁ transmits a code signal wave having a ratio of mark (M) to space (S) of 1: 7 to the rail R as an example. That is, the transmitting unit A ₁ converts the continuous wave W ₁ (a in FIG. 2) from the oscillator 10 into the shaping circuit 11.
Then, the code signal wave W ₂ (b in FIG. 2) is shaped and transmitted to the power transmission terminal A of the rail R via the amplifier 12 and the transformer 13. The advantage of the transmission unit A ₁ sends out a code signal wave,
As described in detail in Japanese Patent Application No. 1-58518 previously proposed by the present applicant, it has features of eliminating the influence of the residual voltage caused by the semiconductor film on the rail R and reducing power consumption. ing.

The first receiving section A ₂ detects the incoming voltage at the power receiving end B (voltage detecting means). That is, the incoming voltage is input from between the rails R on the power receiving end B side of the start detection point X ₁ via the series resonance circuit including the coil L and the capacitor C and the transformer 14, and the signal is processed by the attenuation circuit 15 and the filter 16. Then, only the code signal wave W ₂ is precisely extracted, amplified by the amplifier 19, processed by the level determination / waveform shaping circuit 20, amplified again by the amplifier 21, and sent to the primary side of the transformer 22. It is configured to output. The secondary side of the transformer 22 is the transformer 3 described above.
Because of being connected to the primary side, the code signal wave W ₂ detected by the first receiver A ₂ is transmitted to the transformer 4 side described above via the cable L _1, L _2.

By the way, the train T is start detection point X _1, that is, when entering between the receiving end B and the sending end i, because between the rails R are short-circuited by the axle, the first receiving portion A ₂ code signals Since the wave W ₂ is no longer detected, the train start detection point X
Before entering ₁ , the output waveform of the level determination / waveform shaping circuit 20 is as shown in FIG.

The second receiving section A ₃ of the terminal 1 is for detecting the current of the signal transmitted to the power transmitting end A (current detecting means). That is, the second receiving unit A ₃ transmits the transmitting unit A ₁
Is extracted through a transformer 32, and is extracted by an attenuation circuit 33, a filter 33 ', an amplifier 34,
The signal is detected by the waveform shaping circuit 35, and a detection signal as shown by d in FIG. The peak hold circuit 36 converts a pulse output from the level determination / waveform shaping circuit 35 into a DC signal. That is, the train T is positioned in the start detection point X _1, transformer 32
Holds the value when the current extracted by. Accordingly, the detection output of the second receiver A ₃ in place of the DC level as shown in e of FIG. 2 and outputs to the AND circuit 37. Therefore, it longer slightly than the hold time period of at least code signal wave W ₂ of the peak hold circuit 36.

The other input side of the AND circuit 37 receives the oscillation output (W _{1 in} FIG. 2A) of the transmission section A ₁ . Thus, the peak hold circuit 36 outputs a detection signal as shown in FIG.
A continuous wave (W ₁ ) indicated by f in FIG. 2 is output.

The output of the AND circuit 37 is output to a transformer 39 via an amplifier 38. The secondary side of the transformer 39 is connected to the primary side of the transformer 3 described above. Therefore, the continuous wave (W _{1 in} FIG. 2F) output from the second receiving unit A ₃ and the above-mentioned code signal wave (W _{2 in} FIG. 2C)
The signals are combined by the transformer 3 and transmitted to the central unit 2 via the cables L ₁ and L ₂ . Therefore, the waveform of the signal transmitted to the cables L ₁ and L ₂ corresponding to the train position is as shown in FIG.

Central unit 2 connected to the secondary side of transformer 4
It includes a first detecting means for detecting a code signal wave W ₂ (25,26,27,28,29,30,31), second detecting means for detecting the continuous wave W ₁ (25 and 26 ,
27, 40, 41, 42, 43), and a relay MR for outputting the detection state of each detection means to the outside.
₁ , MR ₂ and a monitoring unit 6 for monitoring the operation state of each relay
And

The code signal wave W ₂ received via the cables L ₁ and L ₂ is processed by the central unit 2 to operate the starting relay MR ₁ for starting the level crossing device Z. That is, the code signal wave W ₂ is subjected to signal processing in the attenuation circuit 25, the filter 26, and the amplifier 27, then is amplified again in the amplifier 28, and is subjected to signal processing in the level determination / waveform shaping circuit 29. wave W ₂ was treated with the code wave determination circuit 30 to accurately determine the extraction, so that to operate the starting relay MR ₁ a linear output of the code wave determination circuit 30 is amplified by the amplifier 31.

[0022] Therefore, when the train T reaches the start detection point X _1, since the code signal wave W ₂ will not be received at the receiving end B, start relay MR ₁ is dropped to "0" (OF
F), and the output for starting the crossing equipment Z is sent through the drop contacts the start relay MR _1. That is, as shown in g of 2, start detection point X ₁ is until it is short-circuited by the axle of the train T, the code signal wave W ₂ from the transmission section A ₁ is input to the first receiver A ₂ , which is received in the central unit 2 via the cable L _1, L ₂ as shown in h of FIG. 2, the start relay MR ₁ is "1" (O
While in the state of N), the start detection point X ₁ are short-circuited by the axle, the code signal wave W ₂ from the transmission section A ₁ is not input to the first receiving unit A _2. Therefore, in order central unit 2 can not be obtained inputted from terminal 1, start relay MR ₁ is "0"
(OFF).

On the other hand, the continuous wave W transmitted to the central unit 2
₁ , the output of the amplifier 27 is branched, and the level is adjusted by an amplifier 40 and a level judgment / waveform shaping circuit 41. Then, a continuous wave discriminating circuit 42 of a well-known outside power supply voltage system similar to the above-described code wave discriminating circuit 30 is used. The judgment is extracted. Then, and a signal of the determination and extraction so as to be amplified by the amplifier 43 operates the auxiliary relay MR ₂ (ON). Auxiliary relay MR _2, by the train T is present in the start detection point X _1, the ON at the output of a continuous wave discrimination circuit 42 when the continuous wave at the central unit 2 (W ₁₎ was detected. In this way, if the track circuit is normal, the two relays MR ₁ and MR ₂ operate complementarily according to the traveling position of the train T,
Regardless of the train position, one of the relays is always "1".

In the terminal 1, the two signal components synthesized by the transformer 3 are such that the output level of the transformer 22, which is a code signal wave (W2), is at least 3 dB higher than the output level of the transformer 37, which is a continuous wave (W1). It is set high. In the central unit 2 ,, continuous wave W ₁ code signal wave W
₂ can be determined by the code wave determination circuit 30 and the continuous wave determination circuit 42 with simple circuit configurations. Level adjustment of the continuous wave W ₁ code signal wave W ₂ is trans 2
2 and the number of turns of the transformer 39 are adjusted. In other words, the number of turns on the primary side of both transformers 22 and 39 is the same, and the ratio of the number of turns on the secondary side of transformers 22 and 39 is 2: 1.
The level of continuous wave W ₁ is set to half the level of the code signal wave W _2.

[0025] The contacts of the starting relay MR ₁ auxiliary relay MR
_An OR circuit 61 is formed by a parallel circuit into which _two contacts are inserted, and a monitoring relay CR is connected to the OR circuit to configure a monitoring unit 6. That is, the monitoring relay CR is configured to be turned on by the logical sum output of the _two relays MR ₁ and MR ₂ . Therefore, when the train detection function of the track circuit is operating normally, the monitoring relay CR is always set to O
N. Although both ends of the continuous wave W ₁ is overlapped partially with the code signal wave W ₂ at the output of g in FIG. 2,
This is to prevent the OR circuit 61 from being in the non-output state when the two relays MR ₁ and MR ₂ are inverted and the monitoring relay CR from being temporarily turned off. To achieve this, level determination of the first receiver A ₂ · waveform shaping circuit 20
If the detection level of the threshold value of the second receiver A _3-level judgment and the waveform shaping circuit 35, take a sufficiently low value within a range that does not malfunction, such as in noise.

The track part of the circuit, for example, a failure to the transmitting unit A ₁ is generated, the relay MR _1, MR ₂ both become "0", therefore, the monitoring relays CR also becomes "0" (OFF), The train detection function is determined to be abnormal. This lile C
When R becomes "0", of course, the railroad crossing device Z is forcibly operated, and the attendant is notified that the starter A is out of order.

The terminal 1 and the central unit 2 form a transmission path for transmitting the code signal wave W ₂ and the continuous wave W ₁ by using _two cables L ₁ and L _{2. 1} , L
Since it is configured to direct current power supply path between ₂ and another second cable L _3, it is not given the noise as in the prior art to another line.

In the above embodiment, one starter A is provided on the entry side of the level crossing Y. However, in actuality, another level crossing exists between the starter and the end mover, or a blockage occurs. There may be a case where a plurality of starters are provided because there are division points of the section. In the case where a plurality of starters are provided between the actuator and the final mover, FIG.
As shown in the figure, a plurality of start detection points X ₁₁ ,
X ₁₂ ..., Starters A ₁₁ , A ₁₂ having the same configuration as the starter A described above.
Are provided. The central machines 2 and 2 'are provided on the railroad crossing Y side. As described above, regarding signal transmission and power supply when a plurality of finalizers are provided,
The oscillation frequency of the transmitter A ₁ of the starting element is different, and,
The pass band of the filter 26 of the central unit 2 can be made to correspond to each oscillation frequency, and the cables L ₁ and L ₂ at the start detection points X ₁₁ and X ₁₂ can be shared as in the example of FIG. In this case, the cost is significantly reduced as compared with the case where a signal cable and a power cable are laid for each start detection point.

Further, as shown in FIG. 4, it is also possible to superimpose all the power supplies on the signal cables L ₁ and L ₂ and omit the above-mentioned power cable L ₃ . in this case,
Cable usage is further reduced.

[0030]

As described above, the orbit circuit for remote monitoring according to the present invention detects the transmission current at the transmitting end and the incoming voltage at the receiving end, combines them and sends them to the distant place. The first detection means for detecting the incoming voltage and the second detection means for detecting the transmission current are provided, and the presence or absence of a failure is monitored by detecting whether the detection outputs of the two detection means satisfy a logical sum condition. The outputs of the first detecting means and the second detecting means can be used for train detection, and the failure monitoring of the track circuit can be completed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram in which a track circuit for distant monitoring according to the present invention is applied to a starter of a railroad crossing control device, wherein (1) shows a terminal side and (2) shows a central side.

FIG. 2 is a time chart showing a control operation.

FIG. 3 is a schematic configuration diagram illustrating an example of a transmission unit according to an embodiment when a plurality of starters are provided.

FIG. 4 is a schematic configuration diagram illustrating another example of a transmission unit.

FIG. 5 is a schematic configuration diagram of a conventional railroad crossing control device.

[Explanation of symbols]

R Rail Y crossing Z crossing device X _1, X _11, X ₁₂ start detection point X ₂ end detecting point A Shidoko B Tsuidoko A ₁ transmission unit (signal sending means) A ₂ first receiver (voltage detection means) A ₃ Second receiving unit (current detecting unit) 1 Terminal 2 Central unit 3, 22, 39 Transformer (combining unit) 25-31 First detecting unit 25.26.27, 40-43 Second detecting unit L _1- L ₃ cable (L _1, L ₂ transmission means) MR ₁ starting relay MR ₂ auxiliary relay CR monitoring relays

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shinichi Iino 1-13-8 Kamikizaki, Urawa-shi, Saitama Nihon Signal Co., Ltd. Yono Office (56) References JP-A-3-61166 (JP, A) JP-A-48-81205 (JP, A) JP-A-2-197459 (JP, A) JP-A-2-148869 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B61L 1/00-29/32

Claims (1)

(57) [Claims] 1. A signal transmitting means for transmitting a signal of a predetermined frequency to a power transmitting end of a rail constituting a track circuit, a voltage detecting means for detecting an incoming voltage of a power receiving end of the rail, and a transmission of a power transmitting end of the rail. Current detecting means for detecting a current, synthesizing means for synthesizing an output of the current detecting means and an output of the voltage detecting means, a transmitting means for transmitting a signal synthesized by the synthesizing means, and a signal transmitted by the transmitting means. First detecting means for detecting a signal component detected by the voltage detecting means from the combined signal, and second detecting means for detecting a signal component detected by the current detecting means from the combined signal transmitted by the transmitting means. And a monitoring means for inputting detection outputs of the first detection means and the second detection means and outputting a monitoring output, wherein the monitoring means comprises a detection output of the first detection means and a second detection means. Distant monitoring the track circuit, characterized in that the detection output of the unit train detection function of the track circuit when satisfying the logical sum condition is determined to be normal.