JP3340769B2 - 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 train detection device using a track circuit, and more particularly to a train detection device which can be realized at low cost and has excellent reliability.

[0002]

2. Description of the Related Art Conventionally, a track detector of a track circuit system has
A line (hereinafter, referred to as a rail) is divided into a predetermined length, the divided rail is formed as a part of an electric circuit of a track circuit, and one end of the divided rail (the starting end in the present invention). ) Is applied, and the signal is received from the other end (the terminating end in the present invention).

Therefore, the reception level on the terminal side changes when the train does not exist on the rail, and changes low when the vehicle is short-circuited by the vehicle (wheel) of the train. And the orbit relay operates by using the change of the reception level,
The presence or absence of a train on the rails of the track circuit is output.

[0004]

However, there are the following problems in the above-described conventional train detection by the track circuit system. (A) There is a transmission device and a reception device for each track circuit, so that miniaturization and cost reduction cannot be achieved. Further, it is necessary to adjust the transmission level and the reception level for each track circuit.
Depending on the type of track circuit, phase adjustment of the transmission current is required, which makes maintenance and maintenance difficult and inferior in maintainability. (B) The track circuit is an electric circuit using rails as a part thereof, and detects the presence of a train by electrically short-circuiting the left and right rails with an axle. can not be covered with insulation material, the rails so to speak in a state of "Exposed in the fields, rain seat ness". Therefore, in a track circuit in which the train travels little, an oxide film due to rust is generated on the rail surface. Further, in recent years, since a synthetic shoe including resin is used as a train shoe of a train, a resin film that has been cut off and adheres to the rail causes a semiconductor film to be formed on the rail surface.
If the thickness of the oxide film or semiconductor film exceeds a certain level, the short-circuit resistance when the rail is short-circuited by the wheel is large, and even if there is a train on the track circuit, the existence of that train can not be detected, "not detected" State. As a countermeasure against such inconvenience, the oxide film or semiconductor film is destroyed by increasing the transmission power applied to the rails of the track circuit and increasing the voltage between the left and right rails at the receiving end of the track circuit. However, this countermeasure requires additional components and additional capacity for the transmitters and receivers of each track circuit, increasing equipment costs and increasing power consumption. Problems arise. Furthermore, it is necessary to adjust the transmission level and the reception level, or to adjust the phase of the transmission current depending on the type of the track circuit. In this case, the adjustment of the transmission level and the reception level and the adjustment of the phase are in conflict. There is a problem that adjustment is difficult. (C) above for "Exposed in the fields, rain seat ness" In rails, a drive source (including the electric car to the train of the present invention, hereinafter also sometimes called electric car trains.) Electric vehicle to motor or Interference current from an adjacent track circuit, etc. (hereinafter, sometimes referred to as noise) is mixed, and despite the presence of a train in the track circuit, the track relay is excited by this interference current and the train does not exist. And “erroneous detection”. In order to prevent erroneous detection due to such disturbance current, the frequency of the current supplied to the electric vehicle and the frequency avoiding its harmonic components were selected as the frequency of the current used in the track circuit and transmitted to the track circuit. The current and the disturbing current are discriminated to prevent erroneous detection. In addition, the level of the current received from the rail is used by using a special relay (dual-type orbit relay) formed of two coils, a coil that sends the reference current and a coil that sends the current received from the rail, for the coil of the track relay. Only when the phase difference with the reference current is the required value, the train is excited as if there is no train, and the influence of the disturbance current is eliminated.However, when using this dual-track relay, As described above, there is a problem that it is difficult to adjust the phase of the transmission current and the maintainability is poor. In addition, in recent years,
Thyristor chopper control or V of the control of the rotational speed and the driving force of an electric vehicle motor incorporating Pawae Les <br/> Kutoronikusu
With the introduction of VVF (Variable Voltage Variable Frequency) control and the like, new noise sources such as low-frequency vibration and high-frequency interference direct magnetic fields have appeared in track circuits. For the noise sources of these various frequency components, the conventional method that simply uses the power supply frequency of the electric car and the frequency avoiding its harmonic components as the power supply of the track circuit can detect the disturbance current accurately. Therefore, there is a possibility that "false detection" of the vehicle due to the disturbance current cannot be prevented. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a train detection device that can be implemented at low cost without erroneous detection due to noise.

[0005]

In order to achieve the above object, a train detection apparatus according to the present invention cyclically time-divides a signal for train detection at a starting end of a track forming a plurality of track circuits. Sending means, sending means for receiving a signal from the terminal side of the line forming the plurality of track circuits, and sending from the sending means in a state where the operations of the sending means and the receiving means are synchronized. When the received signal is received by the receiving means, it detects that there is no train on the line from which the signal was transmitted, and when the signal transmitted from the transmitting means is not received by the receiving means, the signal of the signal is detected. A train detecting means for detecting the presence of a train on the transmitted line, and a line receiving the signal when the receiving means receives a signal from a line other than the line from which the transmitting means transmits a signal for train detection. It is characterized by having a pseudo train detection signal generating means for generating a pseudo train detection signals located train.

In addition, the signal for train detection transmitted from the transmitting means is fed back to the reception level of the signal of the receiving means so that the signal has a predetermined level or more when received by the receiving means. It is characterized by being adjusted.

Further, the train detection signal transmitted from the transmission means has a different frequency for each one-cycle transmission to a plurality of track circuits, and a different cycle for each one-cycle transmission. I have.

[0008] One of the lines is divided by an insulator every time one track circuit is formed, and the other line is formed non-insulated.

[0009]

In the above construction, the transmitting means transmits the train detection signal to the rails forming the track circuit in a time-division manner. When the signal transmitted from the transmitting means is received by the receiving means in a state where the operations of the transmitting means and the receiving means are synchronized, it is detected that there is no train on the line from which the signal is transmitted, and When the signal transmitted from the means is not received by the receiving means, the presence of a train on the line from which the signal is transmitted is detected. In addition, the pseudo train detection signal generation means,
When the receiving unit receives a signal from a line other than the line from which the transmitting unit transmits the train detection signal, a pseudo train detection signal indicating that there is a train on the line receiving the signal is generated.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an apparatus according to one embodiment of the present invention.

Of the pair of right and left rails R ₁ and R ₂ , one rail R ₁ is a track circuit (here, only one track circuit T ₁ is shown to simplify the drawing,
The device of this embodiment includes a plurality of track circuits T _{1 to} T _n , and for convenience of explanation, T ₁ will be mainly described. ) End portions to form a T ₁ is is divided by insulators 1,1, other rail R ₂ is formed on the non-insulated. Accordingly, features in this embodiment apparatus, the current for electric vehicles, in order to flow through the rail R ₂ free insulation, which does not require an impedance bond in mutually adjacent portions of the track circuit, the equipment cost decreases There is.

A connection transformer t, t is connected to the starting end of the track circuit T ₁ (here, the side on which train A advances from the track circuit T ₁ ).
A signal current is applied via a current limiter (current limiting resistor) described later, and a signal current is applied to the terminal side (here, the train A is a track circuit T ₁
A signal hold circuit (to be referred to as an S / H circuit hereinafter) for receiving a signal current or noise is connected to a connection c via a connection transformer t.

[0013] signal extracted from the signal and the track circuit T ₁ of the for train detection applied to the track circuit T ₁ is composed of the following components.

First, the signal transmission will be described. The pair of transmitters 2a and 2b are configured to output predetermined AC signals f ₁ and f ₂ having different frequencies, respectively. ₁ and f ₂ are configured to be input to a switch 4 controlled by the controller 3.

The controller 3 is formed by a microcomputer, and is configured to control the apparatus of this embodiment as a whole. Therefore, the controller 3 controls many devices to be described later in addition to the switch 4.

The switching unit 4 is configured to select _one of the AC signals f ₁ and f ₂ and output it to the transmission level setting unit 5. The transmission level setting device 5 is provided with a track circuit T _1-
What determines the transmission level applied to T _n, the transmission level is an experimental value determined by the rail state of each track circuit T ₁ through T _n (circuit length or circuit constant), the value is previously While being stored in the memory 6,
A value obtained from a reception selection circuit, which will be described later, is input to a feedback circuit (hereinafter, referred to as an F / B circuit) 7 so that a transmission level is always maintained so that an optimum predetermined reception level without erroneous detection is maintained. Has been adjusted. Although the memory 6 is provided separately from the controller 3, a memory (ROM or RAM) (not shown) in the controller 3 may be used.

The output of the transmission level setting device 5 is amplified to a predetermined value by the power amplifier 8, that is, amplified to a predetermined power value such that the oxide film or the semiconductor film is destroyed and the train is not detected. Then, the transmission selection circuit 9 and each current limiter 10
_The signals are cyclically applied to the respective track circuits T _{1 to} T _n via ₁ to 10 _n in a time-sharing manner. That is, the transmission selection circuit 9, as used herein, in one of the track circuit group including a track circuit T ₁ through T _n, and has a role to supply cyclically time-divided AC signal for train detection .

[0018] Next, we describe the received signal, the reception selector 11, the controller 3 by being taken synchronously with the transmission selector 9, that is, during sends a signal to the track circuit T ₁ the track circuit as can receive signals from the T _1, below,
As is being sent a signal to the track circuit T ₂ can receive signals from the track circuit T _2, together are configured to select a reception timing from the track circuit is not being selected, at all times, be able to receive It is configured.

Therefore, the signals received from each of the track circuits T _{1 to} T _n are input to the reception selector 11 via the S / H circuits 12 _{1 to} 12 _n , and are synchronized with the received signals of the track circuits in the synchronized state. is divided and received signal of the track circuit is not in the state is output to the next analog-to-digital (a / D) converter 16, the received signal of the track circuit of the synchronization state to the F / B circuit 7 It is output and used for adjusting the transmission level.

The digitally converted received signal is compared with a predetermined value prepared in advance by a determiner 15 to make a determination. Based on the result of the determination, each track circuit T _{1 to} T _{n is} output via an output unit 16. track relay TR ₁ ~TR corresponding to
It is configured to drive _n .

The output unit 16 also outputs serial data corresponding to the received signal. This data is sent to, for example, a management center (not shown) and used for train operation management and the like.

Although the judging device 15 is provided separately from the controller 3 in the illustrated example, the judging function of the judging device 15 may be provided to the controller 3.

The train detection operation of the above-described embodiment will be described with reference to the time charts of FIGS.

First, referring to FIG. 2, each of the track circuits T ₁ -T ₁
T _n is an ideal state where there is no noise from an electric car or an adjacent track circuit and the like.
Description will be given of a case where does not exist train Lee on ₁ ~T _n.

Each of the track circuits T _{1 to} T _n has an AC signal f ₁
And a signal for train detection based on the AC signal f ₂ alternately every cycle, and when the signal is the AC signal f ₁ , the period is T ₁ ,
In the case of the AC signal f _2, the signal is cyclically time-divided and supplied at the cycle T ₂ .

In this case, the power supplied to each of the track circuits T _{1 to} T _n is adjusted to a value that destroys the oxide film and the semiconductor film, and the transmission level is set so that the receiving side can sufficiently detect the train. Are adjusted by the power amplifier 8 and the transmission level setting device 5.

For this reason, in the apparatus of this embodiment, train detection on the receiving side is performed accurately. Since the disadvantage due to the increase in power is cyclically time-divided into each of the track circuits T _{1 to} T _n , there is an advantage that the power consumption as a whole can be reduced.

[0028] On the receiving side, the receiving selector 11 is put out every time to select each track circuit T ₁ through T _n, sends the signal on the transmission side is detected. Therefore, the determiner 15 detects that there is no train on the transmitted rail, on condition that the signal transmitted by the transmitting side is obtained in synchronization with the receiving side.

On the receiving side, signals (f ₁ , f ₂ ) having different frequencies and periods (T ₁ , T ₂ ) are alternately received for each cycle, so that the transmitting side and the receiving side can:
It monitors that it is operating normally, detects the train position on condition of normal operation, and enables train detection without errors.

[0030] With reference to the time chart of FIG. 3 will be described when a train b is present in the track circuit T _1. When the train Lee enters the track circuit T _1, the rail R _1, R ₂ by the train Lee axle (not shown) are short-circuited. Therefore, the signal level of the receiving side disappears, not detected disappeared as f ₁ of T ₁ in FIG. 3 is shown in dashed lines. Accordingly, the determination unit 15, the absence synchronism with the received signal (f ₁₎ corresponds to the condition the delivery signal (f _1),
Detects that there is a train on the track circuit T _1, the track relay TR ₁
Is de-energized.

While the train A exists on the track circuit T ₁ , the received signals (f ₁ , f ₂ ) are not detected. And
Again received signal when a train Lee moves forward from the track circuit T ₁ is started to detect.

However, in the apparatus of this embodiment, the detection of the received signal starts and the absence of the train is not detected at the same time.
Forcible output for the number of cycles is provided (see (n + 1) th cycle in FIG. 3). Therefore, the unstable detection state at the boundary between the train detection and the train non-detection is regarded as the presence of a train, so that more safety is ensured.

FIG. 4 shows a train detection state when noise f ₀ is detected in the track circuit T ₂ (not shown in FIG. 1). In this case, the train Lee because not present on the track circuit T _2, the received signal is received in synchronization corresponding to the signal on the transmission side on the reception side. Of course, as described with reference to FIG. 3, if there is a train Lee the track circuit T _2,
The received signal disappears.

When the noise f ₀ is detected, the decision unit 15
Signals that do not correspond to the output of the transmitting side, that is so synchronized no signal is present on the track circuit T _2, the track circuit T ₂
Above, as it is impossible normal train detection, the noise f ₀ is while being detected is forcibly generates a pseudo train detection signal has a train on the track circuit T _2. Therefore, the track relay TR ₂ is the non-excitation by the pseudo train detection signal.

However, since such f ₀ does not always exist (if it always exists, a means for cutting the noise can be permanently provided), so that the noise f ₀ is always present. When no more trains are detected, the absence of a train is detected again. Also in this case, similarly to the above, safety is achieved by forcibly detecting the presence of a train until the next cycle (see (n + 1) th cycle in FIG. 4).

[0036]

According to the train detection apparatus of the present invention, a signal for train detection is cyclically supplied to a plurality of track circuits in a time-division manner. High reliability because the cost can be reduced, and when a received signal is obtained from a track circuit that does not correspond to the transmitting side, the presence of a train can be forcibly set on that track circuit, so it is highly reliable It can be.

When the output level of the transmission side is adjusted by feedback control based on the reception level of the reception side, a reception level equal to or higher than a certain level can always be secured.
Train detection performance can be improved.

Further, when the used frequency and the cycle are made different for each cycle, the frequency,
In addition, since train detection can be performed on the condition that the periods correspond, it is possible to perform train detection while monitoring the operation of the train detection device.

When one of the rails is a non-insulated type, no impedance bonding is required, so that the equipment cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is a time chart without a train and without noise.

FIG. 3 is a time chart with a train and without noise.

FIG. 4 is a time chart when there is no train and there is noise.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Insulator 2a, 2b Oscillator 3 Controller (train detection means, pseudo train detection signal generation means) 4 Switching device 5 Transmission level setting device 8 Power amplifier 9 Transmission selector 11 Reception selector 14 A / D converter 15 Judgment Container A Train B End side C Start end side

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-20557 (JP, A) JP-A-53-11410 (JP, A) JP-A-63-145171 (JP, A) JP-A-3-3 61167 (JP, A) JP-A-53-121308 (JP, A) JP-A-62-23163 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B61L 1/18

Claims (4)

(57) [Claims] 1. A sending means for sending a signal for train detection in a time-division manner cyclically to a starting end of a track forming a plurality of track circuits, and a signal from an end side of the track forming the plurality of track circuits. Receiving means for receiving the signal, and in a state where the operation of the sending means and the receiving means are synchronized, when a signal sent from the sending means is received by the receiving means, the signal is sent on the line from which the signal is sent. When no signal is transmitted from the transmitting means and the signal transmitted from the transmitting means is not received by the receiving means, a train detecting means for detecting the presence of a train on the line from which the signal is transmitted is provided. A pseudo-train detection signal generation unit that generates a pseudo-train detection signal with a train on the line that received the signal when the receiving unit receives a signal from a line other than the line that transmits the detection signal, A train detection device comprising: 2. The train detection signal sent from the sending means is adjusted by feeding back the reception level of the signal of the receiving means so that the signal becomes a predetermined level or more when received by the receiving means. The train detection device according to claim 1, wherein 3. The train detection signal transmitted from the transmission means has a different frequency for each one-cycle transmission to a plurality of track circuits, and a different cycle for each one-cycle transmission. The train detection device according to claim 1. 4. One of the lines according to claim 1, wherein one of the lines is divided by an insulator every time one track circuit is formed, and the other line is formed without insulation. The train detection device according to one of the above.