JP3119313B2 - Distributed train detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed train detection apparatus, and more particularly, to a change in a received voltage level due to a short-circuit of a train track and a change in a received voltage level due to a leak current change due to weather for each track circuit. In which the automatic adjustment of the reception voltage level is stopped when the reception voltage level changes due to a track short.

[0002]

2. Description of the Related Art Conventionally, as a train detecting device using a non-insulated track circuit, a centralized train detecting device and a distributed train detecting device are known. The centralized train detection device concentrates the received signal of each track circuit on the central device to detect the train, so that the transmission distance of the received signal becomes longer. For this reason, the reception voltage level decreases and the S / N ratio deteriorates. Moreover,
As the speed of the train increases, the track circuit section becomes longer and the reception voltage level tends to become smaller, so that the above-mentioned drawbacks become more remarkable. The decentralized train detector does not have the above-mentioned problems found in the centralized train detector. Japanese Patent Application Laid-Open No. 62-239801 is known as a prior art of a distributed train detection device. This type of train detection device detects trains based on the relative relationship between the received voltage level of the frequency signal transmitted via the track circuit and the reference level for determining the presence or absence of a train, so that the track circuit leak due to climate Fluctuations in the reception voltage level due to the current pose a problem. As a countermeasure against such a fluctuation, Japanese Patent Application Laid-Open No. Sho 62-239801 discloses a technique for preventing a fluctuation of a reception voltage level by changing a conventional one-point power receiving system to a two-point power receiving system.

[0003]

However, the conventional distributed train detector has the following problems. (A) Since train detection is performed independently for each track circuit, there is no train tracking function such as a centralized train detection device, and it is not possible to predict a track short circuit caused by a train and stop automatic adjustment of the reception voltage level. For this reason, when the train enters the track circuit, a so-called suicide occurs in which the received voltage level is automatically adjusted to follow a change in the received voltage level due to a track short circuit. (B) In today's high-speed trains, the track circuit section tends to be long and the received voltage level is low, so it is not enough to reduce the effect of the fluctuation.
Active automatic adjustment of the reception voltage level is required.

[0004] Therefore, an object of the present invention is to solve the above-mentioned problems, to prevent automatic adjustment by suicide caused by short-circuiting of the track, and to perform automatic adjustment by following only the fluctuation of the reception voltage level due to the leakage current in each track circuit section. It is an object of the present invention to provide a distributed train detection device which can be made possible.

[0005]

According to the present invention, there is provided a distributed train detecting apparatus including a track, a transmitting device, a receiving device, and a control device, wherein the track is an insulated train. Not include a plurality of track circuits, each of the track circuits has a transmission point on one end side, has a reception point on the other end side, the transmission device includes a plurality of transmitters,
Each of the transmitters is provided for each of the track circuits,
It has two output terminals, one of the output terminals is connected to the transmission point, transmits frequency signals having different frequencies to the track circuit, and the other of the output terminals outputs a transmission voltage level or a transmission current level. The receiving device includes a plurality of receivers, each of which is provided for each of the track circuits, connected to the receiving point, receives the frequency signal, and receives a reception voltage level. The control device includes a plurality of control circuits, each of the control circuits is provided for each of the track circuits, the received voltage level of the track circuit, the rear track circuit The transmission voltage level or the transmission current level is input, and the first reception voltage level is set.
When the received voltage level is out of a predetermined level range, the ratio between the received voltage level and the first reference level is a predetermined value. And automatically stops when the transmission voltage level or the transmission current level falls below a second reference level or rises above a second reference level.

[0006]

[Action] The track includes a plurality of track circuits that are not insulated,
Each of the track circuits has a transmission point on one end side and a reception point on the other end side, the transmission device includes a plurality of transmitters, each of the transmitters is provided for each track circuit, One of the output terminals is connected to a transmission point, and transmits frequency signals having different frequencies to the track circuit.The receiving device includes a plurality of receivers, and each of the receivers includes:
It is provided for each track circuit, is connected to a receiving point, receives a frequency signal and outputs a level of a received voltage, and the control device includes a plurality of control circuits. The first receiving voltage level of the track circuit is input, and the receiving voltage level is set.
When the vehicle falls below the reference level, the presence of a train is detected, so that the train can be detected for each track circuit.

Each of the control circuits automatically adjusts the ratio between the reception voltage level and the first reference level to a predetermined value when the reception voltage level is out of a predetermined level range. Therefore, train detection can be performed at an appropriate level for each track circuit.

In each of the transmitters, the other of the output terminals outputs a transmission voltage or transmission current level, and each of the control circuits receives the transmission voltage level or transmission current level of the rear track circuit, and The automatic adjustment is stopped when the transmission voltage level or the transmission current level falls below the second reference level or rises above the second reference level, so that the train enters the track circuit and the track is short-circuited. Before the reception voltage level decreases, a decrease in the transmission voltage level or an increase in the transmission current level due to a short-circuit in the track circuit in the rear is detected, and the automatic adjustment is stopped by predicting the entry of the train into the track circuit, Prevent so-called suicide of the track circuit.

[0009] This makes it possible to prevent a suicidal automatic adjustment due to a track short circuit without tracking the train, and to make it possible to perform an automatic adjustment only following a variation in a received voltage level due to a leakage current in each track circuit section. A detection device can be provided.

[0010]

1 is a block diagram showing the configuration of a distributed train detection device according to the present invention. In the figure, 1 is a track, 2
Is a transmitting device, 3 is a receiving device, 4 is a control device, 5 is a train,
61, 63, 65 and 67 are traffic lights.

The track 1 includes a plurality of track circuits 1 that are not insulated.
T, 3T, and 5T. Track circuit 1T, 3T, 5
Each of T has transmission points S1, S3, S5 at one end corresponding to the front of the course of the train 5, and reception points R1, R3, S3 at the other end.
R5.

The transmitting device 2 includes a plurality of transmitters 21, 23,
25. Each of the transmitters 21, 23, 25 is provided in each of the track circuits 1T, 3T, 5T,
Two output terminals 211, 212, 231, 232, 25
1 and 252, output terminals 211, 231, and 251 are connected to transmission points S1, S3, and S5, and frequency signals f1, f3, and f5 having different frequencies from each other are transmitted to the track circuits 1T, 3T,
5T, and the output terminals 212, 232 and 252 output the transmission voltage levels Vm1, Vm3 and Vm5 or the transmission current levels Im1, Im3 and Im5. In this embodiment, the transmission voltage levels Vm1, Vm3, and Vm5 are output.

The receiving device 3 includes a plurality of receivers 31, 33,
35. Each of the receivers 31, 33, 35 is provided in each of the track circuits 1T, 3T, 5T,
Connected to the receiving points R1, R3, R5, and the frequency signals f1,
f3 and f5 are received, and the reception voltage levels Vr1, Vr3 and Vr5 are received.
Is output.

The control device 4 includes a plurality of control circuits 41, 4
3, 45 included. Each of the control circuits 41, 43, and 45 is provided in each of the track circuits 1T, 3T, and 5T. Usually, it is provided at the boundary of the track circuit from the viewpoint of shortening the signal transmission distance. The control circuit 43 determines the transmission voltage level Vm1 or the transmission current level Im1 of the transmitter 21 of the rear track circuit 1T and the receiver 31 of the track circuit 3T.
Is received as the receiving voltage level Vr3. When the reception voltage level Vr3 falls below the set first reference level Vref31, the system detects "train" and outputs a train detection signal TR3. When the reception voltage level Vr3 is out of the predetermined level range, the reception voltage level Vr3 and the first reference level Vr3
The ratio is automatically adjusted so that the ratio with ref31 becomes a predetermined value. The transmission voltage level Vm1 or the transmission current level Im1 falls below the second reference level Vref12 or the second reference level Vref1.
Stop the automatic adjustment when it rises to ref12 or more. In this embodiment, the automatic adjustment is stopped using the transmission voltage level Vm1. The same applies to the control circuits 41 and 45.

Since train detection is common in the track circuits 1T, 3T, and 5T, the following description focuses on the track circuit 3T.

FIG. 2 is a time chart for explaining the operation of the distributed train detection apparatus according to the present invention. The figure shows the operation from when the train 5 enters the track circuit 3T to when it exits the track circuit 3T. The operation will be described with reference to FIG.

As described above, the track circuit 3T has the transmission point S3 at one end and the reception point R3 at the other end, and the transmitter 23 is connected to the transmission point S3 to transfer the frequency signal f3 to the track. Since the receiver 33 is connected to the receiving point R3, receives the frequency signal f3, and outputs the received voltage level Vr3, the receiver 33 transmits the signal to the track circuit 3T. When the vehicle enters, the track circuit 3T is short-circuited on the axle, and the received voltage level Vr3 of the receiver 33 decreases as the train 5 advances. The control circuit 43 includes the track circuit 3
T receiving voltage level Vr3 is input, and receiving voltage level Vr3
When r3 falls below the set first reference level Vref31, a train "Yes" is detected.
The train detection signal TR3 of the track circuit 3T is obtained at time t2 when the received voltage level Vr3 becomes lower than the first reference level Vref31.
Then, the state of the train changes from "absence" to "presence".

When the last vehicle of the train 5 advances from the track circuit 1T, the axle short circuit of the track circuit 1T is released, and the reception voltage level Vr1 of the receiver 31 increases as the train 5 advances. The train detection signal TR1 of the track circuit 1T is generated at time t3 when the reception voltage level Vr1 exceeds the first reference level Vref11.
Then, the train changes from "Yes" to "No".

Although not shown, the train 5 has a track circuit 5T.
Is similar to the case of entering the track circuit 3T.

When the rearmost vehicle of the train 5 advances from the track circuit 3T, the axle short circuit of the track circuit 3T is released, and the reception voltage level Vr3 of the receiver 33 increases as the train 5 advances. The train detection signal TR3 of the track circuit 3T is generated at the time t when the received voltage level Vr3 exceeds the first reference level Vref31.
4, the train changes from "Yes" to "No". This allows
Train detection can be performed for each track circuit.

The control circuit 43 automatically adjusts the ratio between the reception voltage level Vr3 and the first reference level Vref31 to a predetermined value when the reception voltage level Vr3 is out of the predetermined level range. Therefore, train detection can be performed for each track circuit at an appropriate level.

The transmitter 21 outputs the transmission voltage level Vm1 at the transmission point S1, and the control circuit 43
When the transmission voltage level Vm1 of the track circuit 1T is input and the transmission voltage level Vm1 falls below the second reference level Vref12, the automatic adjustment of the reception voltage level Vr3 or the first reference level Vref31 is stopped. Therefore, before the train 5 enters the track circuit 3T and the reception voltage level Vr3 decreases due to the track short circuit, a decrease in the transmission voltage level Vm1 due to the track short circuit in the track circuit 1T is detected, and the transmission voltage level Vm1 is set to the second level. At time t1 when the reference level Vref12 or less, the train 5 enters the track circuit 3T and the automatic adjustment is stopped to prevent the track circuit 3T from committing suicide. At time t5 when the reception voltage level Vr3 has recovered to a predetermined level or higher and the level fluctuation has decreased, the automatic adjustment is resumed. The transmission voltage level Vm1 is a voltage obtained by dividing the transmission voltage of the transmitter 21 by the output impedance of the transmitter 21 and the impedance of the track circuit 1T viewed from the transmission point S1. A first reference level Vref31 and a second reference level V
Setting with ref12 is optional. Normally, the first reference level Vref31 is set low considering the fluctuation of the reception voltage level Vr3, and the second reference level Vref12 is set high from the viewpoint of stopping the automatic adjustment early.

Thus, there is provided a distributed train detecting apparatus capable of preventing automatic adjustment due to track short-circuit without tracking a train, and enabling automatic adjustment only following fluctuation of a received voltage level due to a leakage current in each track circuit section. Can be provided.

The control circuit 43 increases the reception voltage level Vr3 when the reception voltage level Vr3 decreases, and decreases the reception voltage level Vr3 when the reception voltage level Vr3 increases.
An automatic adjustment method is employed in which the ratio between the reception voltage level Vr3 and the first reference level Vref31 is set to a predetermined value. When the transmission voltage level Vm3 is relatively high, the first reference level Vref31 is decreased when the reception voltage level Vr3 decreases, and when the reception voltage level Vr3 increases, the first reference level Vref31 is decreased.
, And the ratio between the reception voltage level Vr3 and the first reference level Vref31 is set to a predetermined value. The reception voltage level Vr3 or the first reference level Vref31 can be automatically adjusted by changing the attenuation factor of the attenuator or the amplification factor of the automatic gain adjustment circuit (AGC circuit).

FIG. 3 is a block diagram showing the configuration of another embodiment of the distributed train detection apparatus according to the present invention. The present embodiment is a train detection device that employs a two-point power receiving system that is excellent in boundary characteristics of track circuits. A two-point power receiving type train detection device is disclosed in Japanese Patent Application Laid-Open No. 62-239801. The figure shows a configuration in which the two-point power receiving system is applied to the track circuit 3T in FIG. In the figure, the same reference numerals as those in FIG. 1 indicate the same components.

The transmitter 21 is connected to the transmission point S1, and transmits the frequency signal f1 when the transmitter 23 is not transmitting.

The receiving circuit 33 includes coils 331 to 334
And a resistor 335. Coils 331-334
Is electromagnetically coupled. The coil 331 is connected to the receiving point R3, and receives the frequency signal f3 transmitted from the transmitter 23. The coil 332 is connected to the transmission point S1, and receives the frequency signal f3 transmitted from the transmitter 23. The coil 333 has a voltage level V3 (V1-kV2), which is a difference between a reception voltage level V1 of the coil 331 and a voltage level kV2 obtained by multiplying the reception voltage level V2 of the coil 332 by a coefficient k.
Get. The voltage level V3 becomes the reception voltage level Vr3.
The coil 334 is terminated by a resistor 335.

The control circuit 43 has an attenuator 431. The attenuator 431 has a variable attenuation rate and attenuates the reception voltage level Vr3.

Stopping or returning of train detection and automatic adjustment is performed in the same manner as in the example shown in FIG. In the case of the two-point power receiving system, the reception voltage level Vr3 changes between the reception point and the transmission point S1, which is the transmission point, and the reception point R3, and the transmission voltage level Vm1 changes from just before the transmission point S1. Therefore, the automatic adjustment can be reliably stopped.

FIG. 4 is a time chart for explaining a specific automatic adjusting method of the control circuit constituting the present invention. This will be described with reference to FIG. In the figure, VH is the adjustment upper limit of the reception voltage level Vr3, and VL is the reception voltage level Vr3.
VLM is the lower limit of the reception voltage level Vr3,
C3 is an adjustment signal for instructing the attenuator 431 to perform automatic adjustment.

The control circuit 43 starts counting of the timer T from the time t1 when the reception voltage level Vr3 becomes equal to or less than the adjustment lower limit value VL. When the reception voltage level Vr3 becomes equal to or less than the adjustment lower limit value at the time t2 when the timer T elapses. In some cases, the attenuation rate of the attenuator 431 is reduced by the adjustment signal C3. As a result, the reception voltage level Vr3 is automatically adjusted within the range of the predetermined voltage level beyond the adjustment limit value VL. Time t3
When the reception voltage level Vr3 is continuously reduced from to t6, the same automatic adjustment is performed. If the reception voltage level Vr3 has decreased at time t7, the timer T starts counting. In this state, when the train 5 enters the track circuit 3T from the track circuit 1T, the transmission voltage level Vm1
Is reduced, and the automatic adjustment is stopped at time t8. The train detection signal TR3 changes from the train “absence” to the presence at time t9 when the reception voltage level Vr3 becomes equal to or lower than the first reference level Vref31. Time t1 when timer T has elapsed
At 0, the reception voltage level Vr3 is equal to or lower than the adjustment lower limit value VL, but no automatic adjustment is performed. When the train 5 advances from the track circuit 3T, the received voltage level Vr3 recovers, and when the received voltage level Vr3 exceeds the first reference level Vref31, the train detection signal TR3 changes from “presence” to “absence” at time t11. Change. At time t12 when the reception voltage level Vr3 exceeds the lower limit value VLM and the fluctuation of the reception voltage level Vr3 decreases, the counting of the timer T is started.
At time t13 when the time has elapsed, the attenuator 43
1 is reduced. In the figure, the reception voltage level Vr3
Is decreased, but when the reception voltage level Vr3 rises, the attenuator 43 is adjusted by the adjustment signal C3.
1 may be increased. This prevents suicide and allows automatic adjustment for each track circuit.

In the embodiment, the reception voltage level Vr3 is adjusted. However, the attenuator 4 is located on the side of the first reference level Vref31.
31 may be provided, and the first reference level Vref31 may be raised or lowered by following the rise or fall of the reception voltage level Vr3. Further, the attenuator 431 may be provided in the receiver 33.

FIG. 5 is a characteristic diagram showing the relationship between the transmission voltage level and the transmission current level of the transmitter with respect to the impedance of the track circuit as viewed from the transmission point. In the figure, Vm indicates a transmission voltage level characteristic, and Im indicates a transmission current level characteristic. The impedance of the track circuit has been replaced by an equivalent load resistance. The frequency of the frequency signal is 950 Hz and 125
Taking 0 Hz as an example. As shown in the figure, even if the frequency is different, the transmission voltage level Vm and the transmission current level Im change in the same manner, so that the timing for stopping the automatic adjustment is constant for each track circuit. Further, the transmission current level Im may be used instead of the transmission voltage level Vm. The logic for stopping the automatic adjustment is opposite to the case where the transmission voltage level Vm is used, and the automatic adjustment is stopped when the transmission current level Im rises above the second reference level.

[0034]

As described above, according to the present invention, the following effects can be obtained. (A) The track includes a plurality of track circuits that are not insulated, each of the track circuits has a transmission point on one end and a reception point on the other end, and the transmission device includes a plurality of transmitters. Each of the transmitters is provided for each track circuit, one of the output terminals is connected to a transmission point, and transmits frequency signals having different frequencies to the track circuit. The receiving device includes a plurality of receivers. Is provided for each track circuit, is connected to a receiving point, receives the frequency signal and outputs the level of the received voltage, the control device includes a plurality of control circuits, each of the control circuits Is provided for each track circuit, and when a received voltage level of the track circuit is input and the received voltage level falls below a set first reference level, a train “Yes” is detected. From the train for each track circuit It provides a distributed train detection device that can detect. (B) Each of the control circuits automatically adjusts the ratio between the reception voltage level and the first reference level to a predetermined value when the reception voltage level is out of the predetermined level range. Therefore, a distributed train detection device capable of detecting a train at an appropriate level for each track circuit can be provided. (C) In each of the transmitters, the other of the output terminals outputs the level of the transmission voltage or the transmission current, and each of the control circuits receives the transmission voltage level or the transmission current level of the rear track circuit, and The automatic adjustment is stopped when the transmission voltage level or the transmission current level falls below the second reference level or rises above the second reference level. The present invention can provide a distributed train detection apparatus capable of preventing the occurrence of a change in the received voltage level due to the leakage current of each track circuit section and enabling automatic adjustment only following the fluctuation of the received voltage level.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a distributed train detection device according to the present invention.

FIG. 2 is a time chart illustrating the operation of the distributed train detection device according to the present invention.

FIG. 3 is a block diagram showing a configuration of another embodiment of the distributed train detection device according to the present invention.

FIG. 4 is a time chart for explaining a specific automatic adjustment method of a control circuit constituting the present invention.

FIG. 5 is a characteristic diagram showing the relationship between the transmission voltage level and the transmission current level of the transmitter with respect to the impedance of the track circuit as viewed from the transmission point.

[Explanation of symbols]

 Reference Signs List 1 track 1T to 3T track circuit 2 transmitter 21, 23, 25 transmitter 3 receiver 31, 33, 35 receiver 4 controller 41, 43, 45 control circuit 431 attenuator 5 train f1, f3, f5 frequency signal Vr3 Receive voltage level Vm1 Transmit voltage level Vref31 First reference level Vref12 Second reference level

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 62-23163 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B61L 1/00-29/32

Claims (5)

(57) [Claims] 1. A distributed train detection device including a track, a transmitting device, a receiving device, and a control device, wherein the track includes a plurality of track circuits that are not insulated, and each of the track circuits has one end. The transmission device includes a plurality of transmitters, and each of the transmitters is provided for each of the track circuits, and has two output points. One of the output terminals is connected to the transmission point, transmits frequency signals having different frequencies to the track circuit, and the other of the output terminals outputs a transmission voltage level or a transmission current level. The receiving device includes a plurality of receivers, each of which is provided for each of the track circuits, connected to the receiving point, receives the frequency signal, and outputs a reception voltage level. The said system The apparatus includes a plurality of control circuits, each of the control circuits being provided for each of the track circuits, the reception voltage level of the track circuit, and the transmission voltage level or the transmission current of the rear track circuit. Level is input, the train “Yes” is detected when the reception voltage level falls below a set first reference level, and the reception is performed when the reception voltage level is out of a predetermined level range. The ratio between the voltage level and the first reference level is automatically adjusted so as to be a predetermined value, and the transmission voltage level or the transmission current level falls below a second reference level or rises above a second reference level. A distributed train detection device that stops the automatic adjustment when the vehicle goes up. 2. The distributed train detection device according to claim 1, wherein the control circuit automatically adjusts the reception voltage level. 3. The distributed train detection device according to claim 1, wherein the control circuit automatically adjusts the first reference level. 4. The control circuit has an attenuator,
4. The distributed train detection apparatus according to claim 1, wherein the attenuator is automatically adjusted by changing an attenuation rate of the attenuator. 5. The track circuit has two receiving points provided at a predetermined interval, and the receiver attenuates a receiving voltage level at one receiving point and a receiving voltage level at another receiving point. 5. The distributed train detection device according to claim 1, which outputs a voltage level having a difference from the detected value.