JPH1159418A - Critical hindrance annunciator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a critical hindrance annunciator capable of securely receiving data, even in the case where the dispersion of data due to the variation in temperature is caused. SOLUTION: When any of optical fibers 131 to 13n is cut, each of the optical sensor parts 21 to 2n outputs a hindrance detecting signal. The respective optical sensor parts 21 to 2n are arranged on the side of a railway track 5, 6 along its length at intervals. Both ends of each optical fiber 131 to 13n are connected between a pulse light outgoing route 11 and a pulse light return route 12. An optical signal sending part 3 sends a pulse light P1 to the light sending end O of the pulse light outgoing route 11. An optical signal detecting part 4 has a light receivable time window W for receiving the pulse light P21 to P2n being supplied through the pulse light return route 12. The time length T of the light receivable time window W corresponds to the geographical distance of the optical sensor parts 21 to 2n.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a limit trouble notifying device for detecting a trouble on a railway line.

[0002]

2. Description of the Related Art This kind of limit obstruction alarm system detects a derailment of a vehicle running on a conventional line, for example, at a place where a conventional line and a Shinkansen are parallel, and secures the safety of train operation. Installed to do. The idea of the limit trouble notifying device is relatively new, and there are not many methods currently being studied. A typical method is a centralized processing method using an optical fiber, and the limit failure device according to the present invention also falls into this category.

[0003] The limit trouble notification device of the centralized processing method using an optical fiber is provided with a pair of pulse light forward path and pulse light return path along a railway line. Then, on the side of the railway line, a number of optical sensor units are arranged at intervals along the length direction of the railway line, and these optical sensor units are arranged in a ladder shape on a pair of pulse light forward path and pulse light return path. Connecting. The optical sensor section has a large number of optical sensors constituted by optical fibers. The optical fibers constituting the optical sensor are connected in series with each other, and both ends are optically coupled between a pair of pulse light forward path and pulse light return path.

[0004] As described above, since the optical sensor units are arranged at intervals along the length direction of the railway line,
When the pulse light is transmitted in the pulse light transmission outward path, the pulse light returning to the optical signal detection unit has a time difference corresponding to the geographical position of the optical sensor. Therefore, when all of the optical sensor units are normal, the optical signal detection unit obtains a pulse train that repeats at a certain time interval (nsec) according to the geographical position of the optical sensor unit.

If at least one of the optical sensors breaks the optical fiber constituting the optical sensor due to a derailment of the vehicle or the like, a pulse corresponding to the optical sensor is generated at the light receiving end of the optical signal detector. I can't get light. Therefore,
It is possible to detect that a trouble has occurred. The trouble detection is usually performed by an optical signal detection unit.

[0006]

One of the problems that must be solved in the above-described conventional limit trouble notifying device is that the optical fiber constituting the optical sensor unit expands and contracts due to temperature fluctuations. This may cause a temporal variation in the timing of receiving the pulsed light returning from the device, and may make it impossible to receive the pulsed light. The temporal variation of the pulse light receiving timing due to the temperature variation tends to increase as the pulse light of the optical sensor unit located farther from the light transmitting end.

[0007] Another problem is that, when the light receiving timing of the pulse light returning from the optical sensor unit fluctuates with time due to temperature fluctuation, data shift occurs in the optical signal detecting unit. If the data shift is large, it may be difficult to distinguish between the fault data and the data shift due to the temperature fluctuation, so that it is difficult to accurately determine the fault.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a limit trouble notifying device capable of reliably receiving data even when data is shifted due to temperature fluctuation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a marginal trouble notifying device capable of clearly detecting data deviation caused by temperature fluctuation even when the deviation occurs due to temperature fluctuation.

[0010]

In order to solve the above-mentioned problems, a limit failure notification device according to the present invention comprises at least one pair of pulse light forward path and pulse light return path, a plurality of optical sensor units, and an optical signal transmitting unit. And an optical signal detection unit. The pulse light forward path and the pulse light return path are provided along a railway line. Each of the optical sensor units is constituted by an optical fiber, outputs a trouble detection signal when the optical fiber is cut, and sequentially along the length direction of the railway line at intervals along the length of the railway line. Are located.

The optical fiber is optically coupled at both ends between the pulse light forward path and the pulse light return path. The optical signal transmitting unit transmits pulse light to a light transmitting end of the pulse light forward path.

The optical signal detector has a light-receiving time window for receiving the pulse light supplied through the pulse light return path, and a time length of the light-receiving time window is determined with respect to the light transmitting end. Corresponding to the geographical distance of the optical sensor unit.

Each of the optical sensor units is constituted by an optical fiber, and both ends of the optical fiber are optically coupled between the pulse light forward path and the pulse light return path. Sends pulse light to the sending end,
Since the optical signal detection unit receives the pulse light supplied through the pulse light return path, the pulse light transmitted from the optical signal transmission unit is branched from the pulse light forward path to each of the optical sensor units, and each optical sensor unit is The light passes through the return path of the pulse light, and is further received by the optical signal detection unit.

As described above, the plurality of optical sensor units are arranged at intervals along the length of the railway line, so that when the pulse light is transmitted on the pulse light forward path, the pulse light return path is changed. The pulsed light returning to the optical signal detection unit via the optical sensor unit has a time difference corresponding to each geographical position of the optical sensor unit. Therefore, when all of the optical sensor units are normal,
In the optical signal detection unit, according to the geographical position of the optical sensor unit,
A pulse train that repeats at a certain time interval (nsec) is obtained. If the optical fiber constituting the optical sensor is cut off in at least one of the optical sensor units due to derailment of the vehicle or the like, pulse light corresponding to the optical sensor unit is obtained at the light receiving end of the optical signal detection unit. Absent. Therefore, it is possible to detect that a trouble has occurred.

Since the optical signal detector has a light receiving time window for receiving the pulse light supplied through the pulse light return path, it is possible to ignore noise generated at a timing other than the light receiving time window.

As described above, since the optical fiber constituting the optical sensor expands and contracts due to the temperature fluctuation, the light receiving timing of the pulse light returning from the optical sensor changes temporally, and the pulse within the light receiving available time window. Light may not be received. The temporal variation of the pulse light due to the temperature variation tends to increase as the pulse light of the optical sensor unit located farther from the light transmitting end. In the present invention, since the time length of the light reception available time window corresponds to the geographical distance of the optical sensor unit with respect to the light transmitting end, in the optical sensor unit,
Even when the light receiving timing of the pulse light corresponding to the geographical position is shifted due to the temperature fluctuation, the pulse light can be reliably received.

Preferably, the optical signal detection unit generates a data bit within the light receiving available time window on condition that the pulse light is received, and generates a determination bit prepared in advance and a light receiving bit received this time. Then, a bit deviation from the data bit of the pulse is determined. According to this configuration, even when the data is shifted due to the temperature fluctuation, the shift can be clearly distinguished from the trouble detection data and detected.

The determination bit may be generated from a data bit of the pulse light received last time, or may be a data bit previously provided as reference data.

[0019]

FIG. 1 is a diagram schematically showing a configuration of a limit trouble notifying device according to the present invention. The limit trouble notification device according to the present invention includes a pair of pulsed light forward paths and pulsed light return paths 11 and 12, n optical sensor sections 21 to 2n, an optical signal transmitting section 3, and an optical signal detecting section 4. . Pulse light forward path 1
1 and the pulsed light return path 12 are provided along the railway lines 5 and 6. The railway line 5 is a conventional line, the railway line 6 is a bullet train, and both lines 5 and 6 are parallel. Typically, the limit obstruction notification device according to the present invention is provided when a vehicle running on the conventional line 5 is derailed or a falling rock or the like falls on the conventional line 5 at a location where the two lines 5 and 6 are parallel to each other. If a trouble occurs due to the operation, it is installed to detect the trouble and ensure the safety of the train operation of the Shinkansen 6.

Each of the optical sensor sections 21 to 2n is constituted by optical fibers 131 to 13n.
It outputs a trouble detection signal when 31 to 13n is disconnected. Each of the optical sensor units 21 to 2n is connected to a railway track 5, 6
Are sequentially arranged at intervals along the length direction. For example, the distance Ln from the light transmitting end O of the optical signal transmitting unit 3 to the final end of the final optical sensor unit 2n is about 10 km, and n optical sensor units are within the distance of 10 km. 21 to 2n are arranged.
Specifically, based on the light transmitting end O, the optical sensor 21 has a distance L1 to the final end, the optical sensor 22 has a distance L2 to the final end, and the optical sensor 2n has a distance to the final end. Is L
n. Here, L1 <L2. . . <Ln. Although not clear from the illustration, the optical sensor unit 2
Each of 1 to 2n is constituted by a large number of optical sensors constituted by optical fibers.

Both ends of the optical fibers 131 to 13n are optically coupled between the pulse light forward path 11 and the pulse light return path 12. More specifically, the optical fibers 131 to
13n is coupled to the pulse light forward path 11 by optical splitters 111 to 11n, and is coupled to the pulse light return path 12 by optical splitters 121 to 12n. The optical signal transmitting unit 3 transmits the pulse light P1 to the light transmitting end O of the pulse light outward path 11.

The optical signal detector 4 receives the pulse lights P21 to P2n supplied through the pulse light return path 12. The optical signal detection section 4 has a light receiving available time window W.

FIG. 2 is a time chart for explaining the operation of the limit trouble notifying device shown in FIG. Hereinafter, the operation of the limit obstruction notification device shown in FIG. 1 will be described with reference to FIG.
Each of the optical sensor units 21 to 2n includes an optical fiber 131
To 13n, and optical fibers 131 to 13n
Have both ends of a pulse light forward path 11 and a pulse light return path 12
The optical signal transmitting unit 3 transmits the pulse light P1 to the light transmitting end O of the pulse light forward path 11, and the optical signal detecting unit 4 transmits the pulse light supplied through the pulse light return path 12. Light P2 is received.

That is, the pulse light P1 transmitted from the optical signal transmitting section 3 is transmitted from the pulse light forward path 11 to the optical sensor section 21.
Into the pulse light return path 12 through the optical sensor unit 21
And the light signal detector 4 outputs the pulse light P at t1.
The light is received as 21 (see FIG. 2A).

The pulse light P1 is transmitted to the pulse light forward path 12
From the optical sensor unit 22, enters the pulse light return path 12 through the optical sensor unit 22, and
It is received as pulse light P22 at t2 (FIG. 2B)
reference).

Further, the pulse light P1 is a pulse light forward path 1n.
From the optical sensor unit 2n, passes through the optical sensor unit 2n and enters the pulse light return path 12, and the optical signal detection unit 4
At time tn, light is received as pulse light P2n (FIG. 2 (c)).
reference).

As described above, since the optical sensor sections 21 to 2n are arranged at intervals along the length direction of the railway lines 5 and 6, the optical sensor sections 21 to 2n transmit the pulse light P1 to the pulse light forward path 11. In this case, the optical signal detector 4
The pulse light P21 to P2n returning to
n has a time difference corresponding to each geographical position. Therefore, when all of the optical sensor sections 21 to 2n are normal, the optical signal detecting section 4 causes the optical sensor sections 21 to 2n
, A pulse train that repeats at a certain time interval (nsec) is obtained.

If the vehicle is derailed or the like, the optical sensor 2
When at least one of the optical fibers 131 to 13n constituting the optical sensor is cut in at least one of the optical sensors 1 to 2n, the light receiving end of the optical signal detection unit 4 cannot obtain pulse light corresponding to the optical sensor units 21 to 2n. . Therefore, it is possible to detect that a trouble has occurred.

The optical signal detector 4 has light-receiving time windows W1 to Wn (see FIGS. 2D to 2F) for receiving the pulse lights P1 to P2n supplied through the pulse light return path 12. According to this configuration, it is possible to disregard noise generated at a temporal timing outside the light-receiving time windows W1 to Wn.

The time length T of the receivable time windows W1 to Wn
1 to Tn are optical sensor units 21 to 2 based on the light transmitting end O
n geographic distances. For example, in FIG. 1, when the distance from the light transmitting end O to the final end of the optical sensor unit 21 is L1, the temporal length T1 of the receivable time window W1 corresponds to the distance L1, Assuming that the distance to the final end of the sensor unit 22 is L2, the temporal length T2 of the receivable time window W2 corresponds to the distance L2, and furthermore, the optical sensor unit 2n
When the distance to the final end of L
The time length Tn of n corresponds to the distance Ln. Where L
1 <L2. . . <Ln, T1 <T2 <. . .
<Tn.

As described above, the receivable time windows W1 to Wn
Correspond to the geographical distance of the optical sensor units 21 to 2n with respect to the light transmitting end O, the temperature length varies from the geographical position of the optical sensor units 21 to 2n due to temperature fluctuation. Correspondingly, each of the optical sensor units 21 to 2n can be reliably received even when the light receiving timing of the pulse light P21 to P2n is shifted.

If the temporal lengths T1 to Tn of the light-receiving time windows W1 to Wn are fixed to the same value, the optical fibers 131 to 13n expand and contract due to temperature fluctuation, and the optical sensors 21 to 2n If there is a temporal variation in the light receiving timing of the pulse light returning from, the pulse light may not be able to be received within the light receiving available time window.

In the embodiment, the optical signal detector 4 detects the pulsed light P21 to Pd within the receivable time windows W1 to Wn.
Data bits are generated on the condition that 2n is received (see FIGS. 2D to 2F). The illustrated data bits have an 8-bit configuration and are represented as “00111100”. The data bits are stored in the optical signal detection unit 4 or a memory provided outside thereof.

Then, a data bit for determination is generated from the data bit of the pulse light received last time (hereinafter referred to as the previous data bit), and the data bit for determination and the data bit of the pulse light received this time (hereinafter, this data bit) are generated. (Referred to as a bit). According to this configuration, even when the data is shifted due to the temperature fluctuation,
It can be clearly distinguished from the trouble data and detected.

FIG. 3 is a block diagram functionally showing a method of determining a bit shift between the determination data bit and the current data bit. The signal processing unit 41 generates data bits on condition that the pulse lights P21 to P2n are received within the light receiving available time windows W1 to Wn, and stores these data bits in the internal memory.

Then, the previous data bit is supplied from the signal processing unit 41 to the determination data creation unit 42, the determination data bit D1 is generated, and the determination data bit D1 is supplied to the logic determination unit 43.

The logic judgment section 43 is supplied with the current data bit D2 from the signal processing section 41. The logic judgment unit 43
The bit shift between the determination data bit D1 and the current data bit D2 is determined. Next, determination of a bit shift will be described with a specific example. In the following description, it is assumed that the data bits have an 8-bit configuration, and that a bit shift due to a temperature change is up to 1 bit.

FIG. 4 shows a decision output EX. Of a logic decision section 43 composed of a previous data bit, a decision data bit, a present data bit and an exclusive OR circuit. This shows the relationship with OR. In FIG. 4, the previous data bit is “00111100”. It is assumed that the current data bit is “01111000” shifted by one bit to the left from the previous data bit “00111100” due to temperature fluctuation.

On the assumption that the previous data bit "00111100" may be shifted one bit to the right or left due to temperature fluctuation, the determination in the first column indicates that the previous data bit "00111100"
100 ”is shifted to the right by one bit,
11110 ". Since the data bit this time is “01111000”, the logic judgment unit 43 composed of an exclusive OR circuit
Judgment output EX. OR is “01100110”. If the assumed bit shifts (shifts to the right) match,
Judgment output EX. OR should be "00000000" but "011
00110 ”, it is determined that the current data bit has not shifted by one bit to the right with respect to the previous data bit.

Next, in the second column in FIG. 4, a determination data bit “01111000” is created by shifting the previous data bit “00111100” by one bit to the left. Since the data bit this time is “01111000”, the judgment output EX. Of the logic judgment unit 43 constituted by an exclusive OR circuit is determined. OR is “00000000”. Therefore, it can be determined that the current data bit has shifted left by one bit with respect to the previous data bit.

Next, it is assumed that the current data bit is "00011110" shifted by one bit to the right with respect to the previous data bit "00111100" due to temperature fluctuation. FIG.
In the judgment in the third column, the previous data bit “00111100”
Is shifted to the right by one bit,
0 ". Since the data bit this time is “00011110”, the judgment output EX. OR is “00000000”. Therefore, it can be determined that the current data bit has shifted to the right by one bit with respect to the previous data bit.

Next, in FIG. 4, in the fourth column, a determination data bit “01111000” is created by shifting the previous data bit “00111100” by one bit to the left. Since the data bit this time is “00011110”, the judgment output EX. OR is “01100110”. Therefore, it can be determined that the current data bit has not shifted one bit to the left from the previous data bit.

The method of creating the data bits for determination is as follows.
In addition to the method of shifting one bit to the right or left from the previous data bit, one bit is added to the right or left to add “0011111”.
A method of creating a determination data bit of “0” or “0111110”, a technique of reducing the right or left one bit to create a determination data bit of “00111000” or “00011100”, and adding one bit to both sides Then, there is a method of setting “11111111”, and by combining this method, a bit shift due to a temperature change can be detected.

If a trouble occurs, the current data bit is set to "0".
0000000 "can be clearly distinguished from the shift of the data bits due to the temperature fluctuation.

FIG. 5 is a view showing the structure of the optical sensor included in the optical sensor units 21 to 2n. The optical sensor is configured by installing a detection column 7 near the railway lines 5 and 6 and passing an optical fiber 131 therein. A detection unit 8 is provided at the base of the detection column 7. This detection unit 8
A rotatable movable body 82 is provided inside the fixed body 81, and passes through the inside of the movable body 82 and passes through the optical fiber field 131. The movable body 82 is connected to the detection column 7 by the coupling means 83.
Is joined to.

FIG. 6 is a diagram for explaining the operation of the optical sensor shown in FIG. When the detection column 7 is lowered due to derailment of the vehicle or the like, the movable body 82 changes from the state shown in FIG. 6A to the state shown in FIG.
, The optical fiber 131 is cut, and a trouble such as a vehicle derailment is detected.

[0047]

As described above, according to the present invention, the following effects can be obtained. (A) Even if data shifts due to temperature fluctuation,
It is possible to provide a limit trouble notifying device capable of reliably receiving data. (B) Even when data shifts due to temperature fluctuations,
It is possible to provide a limit trouble notification device that can clearly detect the trouble data and detect the trouble data.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a configuration of a limit trouble notifying device according to the present invention.

FIG. 2 is a time chart for explaining the operation of the limit obstruction notifying device shown in FIG. 1;

FIG. 3 is a block diagram functionally showing a bit shift determination method between a determination data bit and a current data bit.

FIG. 4 is a diagram illustrating a relationship between a previous data bit, a data bit for determination, a current data bit, and a determination output of a logic determination unit including an exclusive OR circuit;

FIG. 5 is a diagram illustrating a structure of an optical sensor included in the optical sensor unit.

FIG. 6 is a diagram illustrating the operation of the optical sensor shown in FIG.

[Explanation of symbols]

 Reference Signs List 11 pulse light forward path 12 pulse light return path 21-2n optical sensor section 3 optical signal transmitting section 4 optical signal detecting section

Claims (4)

[Claims] 1. A limit failure notification device including at least a pair of a pulsed light forward path and a pulsed light return path, a plurality of optical sensor units, an optical signal transmitting unit, and an optical signal detecting unit, The pulsed light return path is provided along a railway line, and each of the optical sensor units is configured by an optical fiber, outputs a trouble detection signal when the optical fiber is cut, and In the optical fiber, both ends are optically coupled between the pulsed light forward path and the pulsed light return path, and the optical fiber is arranged in sequence along the length direction and at intervals. Transmits the pulse light to the light transmitting end of the pulse light forward path, the optical signal detection unit has a light reception possible time window for receiving the pulse light supplied through the pulse light return path, and the light reception possible time window Time length, the limit trouble notification apparatus corresponding to the geographical distance of the optical sensor unit relative to the optical end feed. 2. The limit obstruction notifying device according to claim 1, wherein the optical signal detection unit includes:
A limit failure notification device that generates a data bit on condition that the pulse light is received and determines a bit shift between a determination bit prepared in advance and a data bit of the pulse received this time. 3. The limit failure notifying device according to claim 2, wherein the determination bit is generated from a data bit of the pulse light received last time. 4. The limit trouble notifying device according to claim 2, wherein the determination bit is a data bit previously held as reference data.