JPH0714100Y2 - Railroad crossing control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a railroad crossing control device.

(Prior Art) Conventionally, control of a railroad crossing in the case of a single line using a railroad crossing controller is performed by a method described below with reference to FIGS. 6 (a) and 6 (b).

Railroad crossing controller B is located at a predetermined position on both sides of railroad crossing 60.
Place C and D.

BDC ', CDC' and DDC 'are level crossing controllers B, C and D
Are the contacts of each relay BDC, CDC and DDC of
When the train steps on the crossing controller B, the BDC falls,
By stepping on the crossing controller C, the CDC operates.
Further, when the crossing controller D is stepped on, the DDC is set to drop.

Therefore, when the train steps on the level crossing controller B, the BDC falls, and by opening its operating contact BDC ', the repeat relay BPR is released.
Will fall, and the slow relay SLR and holding relay SR will fall by opening the operation contact BPR of the repeat relay BPR. When the slow motion relay SLR falls, its operating contact SLR falls and the CDC
Keeps falling, CSR keeps falling by opening the operation contact CDC '. The CDC is dropped until the train steps on the crossing controller C, and the drop contact CDC 'is closed, but as described above, the crossing control relay R drops due to the operation contact SR and CSR opening, and through that contact. The alarm device (not shown) is operated to start the alarm and the railroad crossing gate is lowered.

When the rear end of the train passes the level crossing controller B, BDC operates and BPR operates, but the slow motion relay SLR drops at a certain time, and the slow motion relay SLR operation contact SLR open and operation contact CD
Since C is open, CSR remains falling. Therefore, since the operating contacts SR and CSR are open, R is dropped and the level crossing alarm is continued. After the rear end of the train passes the crossing controller B, the slow relay SLR operates at a predetermined time, but the CDC is falling until the train steps on the crossing controller C of the crossing road 60. Operation contact CDC open, CSR falling, SR falling, operation contact SR, CSR opening, level crossing control relay R falling, alarm continues. When the train steps on crossing controller C, CDC
Becomes an operation, and the operation contact CDC 'is closed. Since the slow motion relay SLR is in operation at this point, its operation contact S
When LR is closed, CSR becomes active and self-held by operating contact CSR. CD when the rear end of the train passes level crossing controller C
C is dropped, its drop contact CDC 'is closed, operation is held
CSR operation contact When the CSR is closed, R is activated, the railroad crossing alarm is stopped, and the circuit breaker rises. When the train steps on the crossing controller D, the DDC drops, the operation contact DDC ′ is opened to drop the DPR, and the operation contact DPR is opened to drop the slow motion relay SLR. When the rear end of the train passes the level crossing controller D, the DDC operates and the DPR operates. Operating contact BPR and DPR closed, CSR operating contact CSR and slow relay SLR drop contact S
Since the LR is closed, the holding relay SR operates, the operation contact SR holds the operation, and the slow-moving relay SLR operates with a time delay. The CSR also drops because the drop contact SR is open, the drop contact SLR is open, and the operation contact CDC is open. That is, the device is reset when the rear end of the train passes the level crossing controller D.

As described above, the conventional railroad crossing control method starts the alarm by receiving the information that the train has passed the railroad crossing controller B located in front of the railroad crossing and makes the railroad crossing barrier descend to allow the train to cross the railroad crossing. It is configured to stop the alarm when it reaches, and the position of the level crossing controller B is set to a position that can secure the minimum alarm time on the assumption that the train runs at the maximum operating speed of the line section. Has been done. Therefore, depending on the operating speed of the train running in the section, there will be a large difference in the warning time,
The alarm may occur unnecessarily long.

In order to avoid this, it is possible to control the alarm time according to the type of train, but in rush hours in the morning and evening, it is difficult to run at a speed according to the type of train, so it is an effective solution. It cannot be a solution.

(Problems to be solved by the invention) In view of such a current situation, the present invention has two points near the starting point.
Each receiver coil is provided, the traveling speed of the train is calculated from the transit time of the train between the two points, the time at which the train arrives from the starting point to the railroad crossing is calculated, and the alarm is started accordingly. By delaying the time point, an attempt is made to be able to issue an alarm at a substantially constant alarm time, regardless of the difference in running speed of each train.

(Means for Solving Problems) In the present invention, a railroad crossing controller is installed at a position which is a predetermined front of the railroad crossing at an alarm start point and at a position which is an alarm stop point of the railroad crossing so that the train crosses at the alarm start point. When the train crosses the controller, the relay of the railroad crossing controller is dropped, and the alarm and railroad crossing gates start to fall.When the train crosses the railroad crossing controller, the alarm is terminated and the railroad crossing gate is opened. It is premised on a level crossing control device to be raised.

In the railroad crossing control device, two reception coils 3a and 3b are arranged at a predetermined interval along the rail longitudinal direction in front of the railroad crossing controller at the starting point. The receiver coils 3a and 3b are provided with a receiver that receives a variable-range ATS signal from the vehicle top of the vehicle, divides the frequency-divided ATS signal, and synthesizes both received waves. An alarm delay control device is provided to which the synthetic received wave output from the receiver is input. The alarm delay control device includes a separating unit that separates a combined reception wave input from a receiver into the respective reception waves, and an arithmetic circuit having the same configuration connected in parallel and receiving the separated reception waves. And a comparison circuit to which the output side of the arithmetic circuit is connected and a failure detection relay. The arithmetic circuit calculates the speed of the vehicle according to the reception time difference of the separated reception waves, and compares the speed with the maximum operating speed predetermined in the crossing section to detect the actual speed of the vehicle at the minimum warning in the crossing section. It is configured to calculate an alarm start delay time for obtaining minutes. When the alarm start delay information input from the arithmetic circuits connected in parallel is the same, the comparison circuit outputs the alarm start delay information to operate the failure detection relay. On the other hand, one of the two arithmetic circuits is connected so as to send the drop information of the level crossing controller to the alarm control circuit via the contact of the failure detection relay. Also, although the reception information from the receiving coils 3a and 3b is input to the arithmetic circuit, but if the drop information of the crossing controller relay at the starting point is not input, the reception time difference between the receiving coils 3a and 3b causes the actual vehicle When the actual traveling speed information of the vehicle output from the arithmetic circuit for determining the traveling speed is received, the estimated arrival time at the starting point is calculated, and after the estimated time has passed, the alarm control circuit is sent to the crossing controller relay at the starting point. A correction unit for sending the drop command is provided.

(Embodiment) The present invention will be described with reference to an embodiment shown in FIGS.

In FIG. 1, R is a rail, 60 is a railroad crossing, and B is a railroad crossing.
A first level crossing controller disposed at a first alarm starting point provided at a position separated from the 60 in the upstream one direction by a predetermined distance,
D is a second level crossing controller provided at a second alarm starting point provided at a position away from the level crossing 60 in the reverse direction on the downstream side, and C is an alarm provided near the level crossing 60. A third level crossing controller 6 disposed at the stop point is an alarm control circuit which has already been described in detail with reference to FIG. 6 (a), and the known level crossing control device controls the level crossing by the above-described elements. It is carried out.

A feature of the present invention is that a train traveling in the section is provided by providing a first control device 100, a second control device 200, and a third control device 300, which are surrounded by a broken line in FIG. By delaying the alarm start time according to the speed of the alarm, the alarm time is controlled to be almost constant irrespective of the difference in running speed of the train, and secondarily, the constituent elements of the alarm delay control unit are incorrect. Even when the operation is performed, this can be corrected and the switching can be performed so that the known crossing control can be realized. The components of the present invention are roughly divided into the first control device 100 as shown in FIG.
3 of the second control device 200 and the third control device 300
It consists of two. The first control device 100 is provided at a predetermined distance in the left direction from the railroad crossing 60 in the figure,
The control device 200 of the third control device 300 is provided at a predetermined distance from the railroad crossing 60 in the right direction in the figure.
Is provided near the railroad crossing 60. First control device
The main function of 100 is to detect that a vehicle passing from the left to the right in the figure is approaching the level crossing 60 and perform a control to start an alarm.
The main function of 200 is to detect that a vehicle passing from the right side to the left side in the figure is approaching the level crossing 60 and perform a control to start an alarm.
The main function of 300 is to detect that the vehicle has finished passing the railroad crossing 600 and stop the alarm, and to control the start and stop of the actual alarm and circuit breaker.

Reference numeral 11 denotes an ATS on-board device mounted on the vehicle 1, and the oscillating wave of f ₀ is always sent from the on-board member 2 to the ground.

Receiving coils 3a and 3b are arranged at a predetermined interval along the rail longitudinal direction on the upstream side of the first alarm starting point provided on the upstream side of the level crossing 60. Respectively input the oscillating wave f ₀ received from the car top 2 to the alarm delay control circuit 5 via the receiver 4a. 3c and 3d are the second installed on the downstream side of the level crossing 60.
In the receiving coil disposed at a predetermined interval along the rail longitudinal direction further downstream than the alarm starting point of, the receiving coil receives the oscillating wave f ₀ from the car top 2 in the same manner. It is transmitted to the delay control circuit 5 via 4b. On the other hand, the output sides of the level crossing control relays BDC, CDC and DDC are also connected to predetermined elements of the alarm delay control circuit 5, and the output side of the delay control circuit 5 is connected to the alarm control circuit 6.

As shown in FIG. 2, the receivers 4a and 4b include a series circuit of a bandpass filter f ₀ , an amplifier circuit 41 and a frequency divider 42, a bandpass filter f ₀ , an amplifier 41 and a frequency divider 42 '. It consists of parallel connection to the hybrid transformer 43.

The alarm delay control circuit 5 is constructed as shown in FIG.

And a series circuit connected in parallel bandpass filters f ₀ / n with a series circuit of the amplifier circuit 51 and the diode 53, band-pass filter f ₀ / n 'and the amplifier circuit 52 and the diode 54, and the bandpass filter f ₀ / A series circuit of n, an amplifier circuit 51 'and a diode 53', a bandpass filter f ₀ / n ', a series circuit of an amplifier circuit 52' and a diode 54 'are connected in parallel to form a separation section 50.

The two parallel circuits are connected to the input side of the input circuit 55, and the arithmetic circuits 56 and 57 are connected in parallel to the output side of the input circuit 55. The output side of the arithmetic circuits 56 and 57 is connected to the comparison circuit 58, the failure detection relay CHK is connected to the output side of the comparison circuit 58, and the arithmetic circuit 5
The output side of 7 is connected to the output circuit 59.

In such a configuration, the train 1 travels in the direction of the arrow from the left side in FIG.

When the car top 2 of the train 1 passes over the receiving coil 3a in front of the level crossing controller B, the receiving coil 3a receives the oscillating wave f ₀ from the car top 2. The oscillating wave f ₀ passes through the band pass filter f ₀ , is amplified by the amplifier circuit 41, and is f ₀ / n by the frequency divider 42.
And is input to the hybrid transformer 43.

Next, when the car top 2 passes through the receiving coil 3b, the receiving coil
Similarly, 3b receives the f ₀ oscillating wave from the car top 2, is amplified by the amplifying circuit 41 via the band pass filter f _0, and then is divided by the receiving coil 3a to distinguish it from the oscillating wave received. With vessel 42 '
The frequency is divided into f ₀ / n ′ and input to the hybrid transformer 43. Both inputs are synthesized by hybrid transformer 43,
Input to terminal 4A of alarm delay control section 5. Both inputs are separated by bandpass filters f ₀ / n and f ₀ / n ', respectively, and amplified by amplifier circuits 51 and 52, respectively, and then a diode 53,
It is input to the dual type arithmetic circuits 56 and 57 via the input circuit 55 and the input circuit 55. In the arithmetic circuits 56 and 57, the input signal f ₀ / n
By f ₀ / n ′, it is determined whether the signal is received by the receiving coil 3a or the receiving coil 3b, thereby detecting the traveling direction of the train and Detect the time difference of signal reception. Receiver coil
The interval between 3a and 3b is as set in advance, and the interval is stored in the first storage section of each of the arithmetic circuits 56 and 57. In the arithmetic circuits 56 and 57, the distance between the receiving coils 3a and 3b stored in the first storage unit is divided by the reception time difference between the receiving coils 3a and 3b in the first dividing unit, and the train concerned. To detect the speed of. After that, the second
The train 1 arrives at the railroad crossing 60 from the starting point B by dividing the distance from the railroad crossing controller B to the railroad crossing 60 stored in the second storage unit by the detected train speed in the division unit. Calculate the time until. Thereafter, the subtraction unit subtracts the calculated time and the predetermined minimum warning time for the railroad crossing section stored in the third storage unit, and the warning is given for a time corresponding to the difference. In the delay control section
It delays the fall of BDC and outputs it to the output circuit 59. More specifically, as described with reference to FIG. 6 (a),
When the train car 2 of the train 1 steps on the crossing controller B, the relay BDC
However, the drop information is input to the arithmetic circuits 56 and 57 via the terminal BDC of the alarm delay control circuit 5 and the input circuit 55. The arithmetic circuit 57 outputs the output circuit 59,
As shown in FIG. 6 (a), a command for delaying the fall of BDC in FIG. 6 (a) by the terminal BDC 'is output, whereby it is clear from the detailed description of FIG. 6 (a). The fall of the railroad crossing control relay R is delayed by that amount. As a result, it becomes possible to control the alarm time proportional to the train speed, and the alarm time can be kept almost constant regardless of the difference in train speed.

In the alarm delay control circuit 5, the arithmetic unit is configured by a dual system of arithmetic circuits 56 and 57 having the same configuration, and the arithmetic circuit 5
Input the same information to 6 and 57 to perform the same calculation,
The delay time of the alarm, which is the calculation result from the two calculation circuits 56 and 57, is output to the comparison circuit 58. In the comparison circuit 58, when the two input operation results are the same, the failure detection relay CHK is activated to judge that the device is normal, and the alarm delay control is performed, but if both outputs do not match, the failure detection relay
CHK is determined to be a drop, and a device failure is determined and a failure detection relay CHK
The crossing control device according to the present invention is separated from the publicly known crossing control device by switching the contact CHK 'of the present invention, and the terminals BDC, CDC, DDC in FIGS. 1 and 3 are directly connected to the alarm control circuit 6 to control the crossing. Information from the child relays BDC, CDC, and DDC is directly input to the alarm control circuit 6, and the known level crossing control described with reference to FIG. 6A is switched to ensure fail-safety of the device.

When the train 1 passes the railroad crossing 60 and then the railroad crossing controller D at the alarm device reset point, the CDC operates, then the DDC falls, and the signal concerned is the terminals CDC and DDC of the alarm delay control circuit 5. , Input circuit 55, arithmetic circuit 57, output circuit
The signals are output from the terminals CDC 'and DDC' via 59, but the signals only pass through the delay control circuit 5 and no calculation is performed, and the signals from the terminals CDC 'and DDC' are output as shown in FIG. As described in a) and (b), the alarm is stopped and the railroad crossing device is reset.

Next, the railroad crossing control device according to the present invention is configured to correct the illegal operation of the receiving coil, the railroad crossing controller relay, etc. as follows.

FIG. 4 illustrates a correction measure when the receiving coils 3a and 3b at the starting point B and the railroad crossing controller relay BDC operate improperly. As described above, the arithmetic circuits 56 and 57 are connected to the receiving coil 3a.
When the received information from 3 and 3b and the drop information of the railroad crossing controller relay BDC are not input, the arithmetic circuits 56 and 57 do not perform the operation and the alarm delay signal is not issued. The case shown as (1) is an example in which the reception information of the reception coils 3a and 3b is input but the drop information of the BDC is not input.
In this case, the running speed of the train is known, and
Since the interval between the receiving coil 3b and the point B is stored in the arithmetic circuit, the estimated time when the train arrives at the point B after passing through the receiving coil 3b can be detected. Therefore, the arithmetic circuits 56, 57
In this case, when the above calculation arrival time has elapsed after calculating this and passing through the receiving coil 3b, the calculation circuits 56, 57
Output from and drop the repeat relay BPR and drop R. Further, as shown in (2) to (4) of FIG. 4, the received information of one or both of the receiving coils 3a and 3b is not input to the arithmetic circuits 56 and 57, and the BDC drop information at the starting point B is not received. When only the data is input to the arithmetic circuits 56 and 57, the drop information is input to drop the BPR shown in FIG. 6 (a) to drop R and start the alarm. In the above cases (1) to (4), since the conditions for performing the calculation by the calculation circuits 56 and 57 are not provided, the detection signal at the expected arrival time at the starting point B and the BDC drop signal at the starting point B causes The conventional crossing control is performed.

FIG. 5 illustrates a correction measure when the railroad crossing controller C of the railroad crossing road 60 performs an improper operation. If the operation information of the level crossing controller C arranged at the level crossing 60 is not input, when the reception information of the receiving coils 3c and 3d is input, a signal for operating the level crossing control relay CDC is generated by the reception input.
Output from.

(Effects of the Invention) The main effects of the present invention are as follows.

(1) Conventionally, the point B, which is the alarm start point, is set to a place where the minimum alarm time can be secured on the assumption that the train runs at the maximum operating speed of the line section, and the train steps on the point B. As soon as the alarm and the railroad crossing breaker are started to fall, in the present invention, the receiving coil 3a is arranged in front of the starting point B at a predetermined interval along the rail longitudinal direction. , 3b is used to detect the actual traveling speed of the train at the point, and the alarm start time set as described above is delayed according to the traveling speed. Regardless of the difference, it is possible to issue an alarm with a substantially constant alarm time, and the alarm time will not unnecessarily increase depending on the running speed of the train.

(2) In the receiving device 4, the received waves of the receiving coils 3a and 3b are divided into f ₀ / n and f ₀ / n 'by frequency dividers so that they can be sufficiently discriminated from each other and then combined. do it,
It outputs to the alarm delay control circuit 5, and in the alarm delay control circuit, the operation circuits 56 and 57 are made into a dual system, and the operation results of the respective operation circuits are constantly compared by the comparison circuit 58. Since the device is configured to perform the leveling control according to the present invention only when it is in the normal state, it is possible to realize the timed control extremely safely.

(3) When the calculation results by the above-described calculation circuit do not match, it can be determined that there is a failure and the conventional level crossing control device can be automatically switched to, so that sufficient fail-safety can be secured.

(4) The reception information of the receiving coils 3a and 3b is input in preparation for the case where the railroad crossing controller operates improperly due to the track circuit condition, the weather, or the like. Performs such an emergency operation function. That is, the receiving coil 3a,
The arrival time at the starting point B is estimated by the traveling speed of the train detected by the reception information of the train 3b, and the railroad crossing controller B is detected when the above estimated time has elapsed after the train car train passed through the receiving coil 3b. Create a state of falling and start an alarm,
In addition, either the receiving information of only one of the receiving coils 3a or 3b can be obtained, or even if the receiving information of both is not obtained, B
If the drop information of the railroad crossing controller relay BDC at the point is obtained,
Based on the drop information, the conventional level crossing control device is configured to perform level crossing control.
If the operation information of No. is not input, the state similar to that of the CDC operated by the reception information of both the receiving coils 3c and 3d arranged in the rear near the point D is brought out, and the R is operated. It is configured to stop the alarm.

Therefore, even if there is a failure in the above-described components, fail-safe level crossing control can be performed by selectively using the level crossing control device according to the present invention and the conventional level crossing control device.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing the entire configuration of the present invention, FIG. 2 is a circuit diagram showing details of the receiver in FIG. 1, and FIG. 3 is a circuit diagram showing details of the alarm delay control circuit in FIG. FIG. 4 is a block diagram for explaining the operation of the present invention when the level crossing controller relay arranged at the starting point and the receiving coil arranged in front of and close to the starting point are broken in the present invention; FIG. 6 is a block diagram for explaining the operation of the present invention when a railroad crossing controller relay arranged on a railroad crossing fails, and FIG. 6A is a circuit diagram showing an alarm control circuit of a conventional railroad crossing control device. FIG. 6 (b) is a diagram showing the operation and non-operation of each component in the alarm control circuit of FIG. 6 (a). 1 ... vehicle, 2 ... car upper, 3a ... first receiving coil,
3b ... second receiving coil, 3c ... third receiving coil, 3d
...... Fourth receiving coil, 4a …… Receiver, 4b …… Receiver,
4A ... first synthesized signal wave / its input terminal, 4B ... second synthesized signal wave / its input terminal, 5 ... alarm delay control circuit,
6 ... Alarm control circuit, 11 ... ATS on-board device, 41 ... Amplifier, 42,42 '... Divider, 43 ... Hybrid transformer, 50 ... Separation part, 51,51', 52,52 ′ …… Amplifying circuit, 53,
53 ', 54,54' …… Diode, 55 …… Input circuit, 56 ……
1st arithmetic circuit, 57 ... 2nd arithmetic circuit, 58 ... comparison circuit, 59 ... output circuit, 60 ... railroad crossing, 100 ... first control device, 200 ... second control device , 300 ...... third control device, B ... first level crossing controller, C ... third level crossing controller, D ... second level crossing controller, R ... rail, BDC ...
Level crossing control relay / first detection signal, CDC ... Level crossing control relay / third detection signal, DDC ... Level crossing control relay / second
Detection signal, BDC '... Relay contact / alarm start signal, C
DC '... relay contact / alarm stop signal, DDC' ... relay contact / alarm start signal, SR, CSR ... relay operation contact, BPR ... repeat relay, SLR ... slow motion relay, CHK
...... Failure detection relay, CHK '... Fault detection relay contact, f0 ... Frequency of signal wave transmitted from vehicle, n, n'
...... Division ratio, 100 ...... First control device, 200 ...... Second control device, 300 ...... Third control device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Mita 1-29-2, Heian-cho, Tsurumi-ku, Yokohama City, Kanagawa Prefecture Kyosan Manufacturing Co., Ltd. (56) Reference JP-A-62-218263 (JP, A) JP-B 37-18252 (JP, B1) JP-B 41-7521 (JP, B1) JP-B 49-29842 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A railroad crossing control device comprising a first control device (100), a second control device (200), and a third control device, the railroad crossing along a rail (R). An alarm stop point near (60), a first alarm start point at a position a predetermined distance upstream from the railroad crossing, and a first alarm start point at a position a predetermined distance downstream from the railroad crossing. 2 alarm starting points are provided, and the first control device (100) is provided with the first level crossing controller (B).
A first receiving coil (3a) and a second receiving coil (3a)
b) and a receiver (4a), the first level crossing controller (B) detects that the vehicle has passed the first alarm start point and outputs a first detection signal (BDC). Output, the first receiving coil (3a) and the second receiving coil (3b)
Is arranged at a predetermined distance along the longitudinal direction of the rail (R) at a position further distant from the level crossing (60) to the upstream side of the first alarm start point, and is transmitted from a passing vehicle. The signal wave having a predetermined frequency (f0) is received, and the receiver (4a) divides the signal wave received by the first receiving coil (3a) by the first frequency division ratio (n) to obtain the first frequency. 1 frequency-divided signal is generated, the signal wave received by the second receiving coil (3b) is frequency-divided by the second frequency division ratio (n ′) to generate a second frequency-divided signal, 1 divided signal and 2nd
The second control device (200) generates the first combined reception wave (4A) by combining the frequency-divided signal of the second crossing controller (D).
And a third receiving coil (3c) and a fourth receiving coil (3c
d) and a receiver (4b), the second crossing controller (D) detects that the vehicle has passed the second alarm starting point and outputs a second detection signal (DDC). Output, the third receiving coil (3c) and the fourth receiving coil (3d)
Are arranged at a predetermined distance along the longitudinal direction of the rail (R) at a position further distant from the level crossing (60) to the downstream side of the second alarm starting point, and are transmitted from a passing vehicle. The signal wave having a predetermined frequency (f0) is received, and the receiver (4b) divides the signal wave received by the third receiving coil (3c) by the third frequency division ratio (n) to obtain the first signal. The third divided signal is generated, the signal wave received by the fourth receiving coil (3d) is divided by the fourth dividing ratio (n ′), and the fourth divided signal is generated. 3 division signal and 4th
A second combined reception wave (4B) is generated by combining the frequency division signal of the third control signal (3B), and the third control device (300) controls the third level crossing controller (C).
And a warning delay control circuit (5) and a warning control circuit (6), and the third level crossing control circuit (C) detects that the vehicle has finished passing the warning stop point, The detection signal (CDC) is output, and the alarm delay control circuit (5) outputs the first detection signal (BDC), the second detection signal (DDC), the third detection signal (CDC), and the first detection signal (BDC).
An alarm start signal (BDC ', DDC') and an alarm stop signal (CDC ') based on the combined reception wave (4A) and the second combined reception wave (4B) of (50)
And a first arithmetic circuit (56) and a second arithmetic circuit (57)
And a comparison circuit (58) and an output circuit (59, CHK, CHK '), and a separation unit (50) converts the first combined received wave (4A) into a first divided signal and a first divided signal. Separated into 2 divided signals,
The second combined reception wave (4B) is separated into a third frequency-divided signal and a fourth frequency-divided signal, and the first arithmetic circuit (56) is divided by the demultiplexing section (50) into the first frequency-divided signal. Based on the frequency-divided signal and the second frequency-divided signal, a first delay signal obtained by delaying the first detection signal (BDC) or a first pseudo-delay signal corresponding to the first delay signal is output, and the separation unit ( 50) A second delay signal obtained by delaying the second detection signal (DDC) based on the third frequency-divided signal and the fourth frequency-divided signal, or a second pseudo-delay corresponding thereto. The second arithmetic circuit (57) outputs a signal, the second arithmetic circuit (57) has the same function as the first arithmetic circuit (56), and the comparison circuit (58) outputs a signal output from the first arithmetic circuit (56). , The output circuit (59, CHK, CHK ′) by detecting whether or not the signal output from the second arithmetic circuit (57) matches.
Gives the third detection signal (CDC) to the alarm control circuit (6) as an alarm stop signal (CDC '), and when the comparison circuit (58) detects a coincidence, the coincident signal is activated as an alarm. Signals (BDC ', DDC') are given to the alarm control circuit (6), and if no match is detected, the first detection signal (BDC) or the second detection signal (DDC) is used as it is as the alarm start signal. (BDC ', DDC') is given to the alarm control circuit (6), and the first arithmetic circuit (56) and the second arithmetic circuit (57)
Has a first normal operation function, a second normal operation function, a first emergency operation function, and a second emergency operation function, and the first normal operation function is the first detection signal ( BDC) is obtained, the second normal operation function is performed when the second detection signal (DDC) is obtained, and the first emergency operation function is performed by the first detection signal (BDC). Is not performed, the second emergency operation function is performed when the second detection signal (DDC) is not obtained, and the first normal operation function is performed by the first
Based on the time difference between the frequency-divided signal and the second frequency-divided signal, the speed of the vehicle passing near the first warning start point toward the railroad crossing is obtained, and a predetermined delay is obtained based on this speed. The time is calculated, and the signal obtained by delaying the first detection signal (BDC) by the delay time calculated is output as the first delay signal, and the second normal operation function is the third frequency division signal. The speed of the vehicle passing near the second warning start point toward the railroad crossing is obtained based on the time difference between the fourth frequency-divided signal and the predetermined delay time is calculated based on this speed. Second
The signal obtained by delaying the detection signal (DDC) of step 1 by the delay time calculated is output as the second delay signal, and the first emergency operation function is to generate the first frequency division signal and the second frequency division signal. The speed of the vehicle passing near the first alarm start point toward the railroad crossing is obtained based on the time difference generated between the two, and the time at which the vehicle passes the first alarm start point is predicted based on this speed. ,
Assuming that the first detection signal (BDC) is obtained at this predicted time, the first pseudo delay signal corresponding to the first delay signal is output, and the second emergency operation function is the third frequency division signal. And the fourth
The speed of the vehicle passing near the second warning start point toward the railroad crossing is calculated based on the time difference between the second warning start point and the second warning start point, and the vehicle passes the second warning start point based on this speed. The alarm control circuit (6) outputs the second pseudo delay signal corresponding to the second delay signal assuming that the second detection signal (BDC) is obtained at this predicted time. ) Is the alarm start signal (BDC ′, DDC ′)
Based on the control, the alarm for the crossing is started to sound and the circuit breaker is lowered. Based on the alarm stop signal (CDC '), the alarm for the crossing is stopped and the circuit breaker is raised. There is a railroad crossing control device.