JPH0813645B2 - Non-insulated track circuit device of voltage transmission / reception system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage transmission / reception type non-insulated track circuit device in a non-insulated track circuit for detecting a train position, and more particularly to securing a long train detection section and improving boundary accuracy on the approach side. .

[0002]

2. Description of the Related Art Non-insulated track circuits are track circuits that do not have track insulation at the boundaries of the circuits. They are roughly classified into a resonance type that uses rail resonance and a non-resonance type that does not use rail resonance. . In the resonance type, a short-circuit line or a resonance element is inserted between rails to prevent it from wrapping around on other tracks, and the boundary point of the train detection section is clarified. Since this resonance type arranges various devices around the track circuit, construction and maintenance inspection are complicated,
Since the non-resonant type does not use rail resonance, the peripheral equipment of the track circuit can be configured with simple and stable equipment, and the labor for construction and maintenance can be saved. In this resonance type non-insulated track circuit, the transmission point adopts voltage transmission with a simple structure and good transmission efficiency, and the reception point has three methods of voltage reception, current reception and voltage current reception according to the performance requirements of the system. Has been adopted. Of these three methods, the voltage power transmission / reception method can be the simplest because the track requires only the electric wire for connecting the matching transformer and the rail.

[0003]

The definition of the boundary point of the train detection section in the above voltage transmission / reception system is determined by adding rail impedance to the axle short circuit resistance of the train approaching the boundary point and the rail. It is determined by the shunt ratio with the internal resistance of the connected transmitter or receiver. Therefore,
The higher the ruimpance, that is, the higher the frequency used for the train detection signal, the more clearly the boundary point can be defined. On the other hand, the train detection signal is more attenuated in the track circuit as the frequency used is increased, and it is difficult to configure a long detection section. In this case, by transmitting a train detection signal from the middle part of one train detection section, and by providing a track circuit configuration in which receivers are provided at both ends of the train detection section,
The train detection section can be doubled in length. However, to clarify the boundary point, for example, 20KH
From z, train detection signals with a frequency of about 30 KHz or more had to be used, and the train detection section at this time was about 800 m at maximum, and it was difficult to secure a longer train detection section.

The present invention has been made in order to solve the above drawbacks, and it is a non-insulated track circuit device of a voltage transmission / reception system capable of clarifying the boundary points of the train detection section and lengthening the train detection section. The purpose is to obtain.

[0005]

A non-insulated track circuit device according to the present invention is provided in a transmitter (1) provided in an intermediate portion near the approach side of a train detection section and both terminals in the train detection section. Non-insulated track circuit device of voltage transmission / reception system having receivers (2), (3)
Which transmits a train detection signal, has a signal wave generator (4) and a transmitter (5), and the signal wave generator (4) is 2
An oscillator (7) for generating a train detection signal including three different frequencies, a carrier (7) for generating a carrier of a relatively high frequency, an oscillator (8) for generating a carrier of a relatively low frequency, and both oscillators (7) , The carrier generated in (8)
Modulators (10) that perform frequency shift keying at fixed intervals
And the transmitter (5) transmits the train detection signal generated by the signal wave generator (4), and the receiver (2) provided at the approach end receives the train detection signal transmitted to the approach side. The band filter (12) receives a train detection signal of a relatively high frequency and has a band filter (12) and a signal receiving unit (13). Is a train detection signal of a relatively high frequency sent from the band pass filter (12), and the receiver (3) provided at the advancing end receives the train detection signal transmitted to the advancing side. , A band pass filter (16) and a signal receiving unit (17), the band pass filter (16) passes only a train detection signal of a relatively low frequency, and the signal receiving unit (17) is a band pass filter. It is characterized by receiving a train detection signal of a relatively low frequency sent from (16).

[0006]

In the present invention, on the approach side of the train detection section
From a transmitter provided in the near middle portion , two frequencies of a relatively high frequency and a relatively low frequency are alternately frequency shift-modulated and transmitted as a train detection signal. The receiver provided at the approach end receives only the train detection signal having a relatively high frequency. The relatively high frequency train detection signal received by the receiver installed at this approach end is sent from the transmitter installed in the middle part near the approach side of the train detection section , so attenuation in the track circuit is suppressed. It can be made small and the boundary points are made clear. The receiver provided at the advancing end receives only the train detection signal of a relatively low frequency with little attenuation, and lengthens the train detection section.

[0007]

1 is a block diagram showing an embodiment of the present invention. A transmitter 1 is provided in the middle of each track circuit 1T, 2T, 3T from the entry side, and receivers 2 and 3 are provided at the entry end and the exit end, respectively. The transmitter 1 has a signal wave generator 4, a transmitter 5, and a matching transformer 6 connected to the middle of the approach side of the track circuit.

The signal wave generator 4 has oscillators 7, 8, 9 and a modulator 10. The oscillator 7 selects and generates a train detection signal of a carrier wave having frequencies FH1 to FH3 of about 3 frequencies among frequencies of a relatively high frequency, for example, about 20 KHz to 30 KHz, and sends it to the modulator 10. The oscillator 8 has a relatively low frequency, for example, a large number of frequencies F of about 1 KHz to 2 KHz.
The train detection signals of L1, FL2, ..., FLn are selected, generated, and sent to the modulator 10. The oscillator 9 generates a modulated wave of frequency Fm and sends it to the modulator 10. The train detection signals of a plurality of waves respectively generated by the oscillators 7 and 8 are track circuits 1T and 2 in order to prevent malfunction due to leakage into adjacent track circuits because the track circuits are non-insulated track circuits.
T, 3T ... Each frequency is arranged in a fixed interval
It repeats every time. The modulator 10 frequency-shift-modulates the carrier waves sent from the oscillators 7 and 8, respectively, and sends the carrier waves to the track circuit via the transmitter 5 and the matching transformer 6.

The receiver 2 provided at the entrance end has a matching transformer 11, a bandpass filter 12, a signal receiver 13 and an on-line detection relay 14 connected to the entrance end of the track circuit. The bandpass filter 12 sends only the train detection signal of the relatively high frequency sent from the matching transformer 11 to the signal receiving unit 13.

The receiver 3 provided at the advancing end has a matching transformer 15, a bandpass filter 16, a signal receiving section 17, an on-line detection relay 18 and the like connected to the advancing end of the track circuit. The bandpass filter 16 sends only the train detection signal of the relatively low frequency sent from the matching transformer 15 to the signal receiving unit 17.

The operation of the track circuit 2T in one section in the non-insulated track circuit device configured as described above will be described.

The oscillator 7 sends a carrier having a relatively high frequency FH1, for example, 25 KHz, and the oscillator 8 sends a carrier having a relatively low frequency FL1, for example, 1 KHz, to the modulator 10, and both carriers have a frequency of about 10 to 20 Hz. After the shift modulation, the modulated output signal is power-amplified by the transmission unit 5, and then transmitted as a train detection signal to the transmission point 19 of the track circuit 2T via the matching transformer 6. This train detection signal is track circuit 2
It is sent to the receiver 2 provided at the entrance end 20 and the receiver 3 provided at the entrance end 21 via T and input to the matching transformers 11 and 15, respectively.

The train detection signal input to the matching transformer 11 at the approach end 20 is transmitted to the bandpass filter 12 at a relatively high frequency FH1.
The signals other than the train detection signal and the interfering voltage are removed and sent to the signal receiving unit 13. Since the train detection signal of the relatively high frequency FH1 is sent from the transmitter 1 connected to the transmission point 19 relatively close to the approach end 20 of the track circuit 2T, the train detection signal is transmitted between the transmission point 19 of the track circuit 2T and the approach end 20. The attenuation of can be suppressed to a small level. After the modulated wave is taken out from the train detection signal of frequency FH1 sent to the signal receiving unit 13, the signal level is determined and a predetermined process is performed to operate the on-rail detection relay-14.

As shown in the circuit diagram of FIG. 2, the train detection characteristic of the receiver 2 provided at the approach end 20 is the rail impedance RR and the axle short-circuit resistance of the train 22 due to the frequency FH1 of relatively high frequency of 25 KHz. Since the signal is received by the shunt ratio of the combined resistance of the RS and the internal resistance of the receiver 2, the reception level does not drop even when the train 22 approaches the vicinity of the approach end 20, and the boundary can be clarified. .

On the other hand, the train detection signal input to the matching transformer 15 at the advancing end 21 is removed by the bandpass filter 16 from signals other than the train detection signal of the relatively low frequency FL1 and the interfering voltage, and then received by the signal receiving unit 17. Sent. Since the train detection signal sent to the signal receiving unit 17 has a relatively low frequency FL1, the attenuation of the train detection signal can be suppressed small even if the distance between the transmission point 19 and the advancing end 21 is increased. After the modulated wave is extracted from the train detection signal of the frequency FL1 sent to the signal receiving unit 17, the signal level is determined and a predetermined process is performed to operate the on-rail detection relay-18.

As shown in the circuit diagram of FIG. 2, the train detection characteristic of the receiver 3 provided at the advancing end 21 is the rail impedance RR by the frequency FL1 as relatively low as 1 KHz and the last part of the train 23. Since the signal is received by the shunt ratio of the combined resistance of the axle short-circuit resistance RS and the internal resistance of the receiver 3, even if the rearmost portion of the train 23 passes through the exit end 21, the frequency is higher than that of the approach end 20 side. The position at which the receiver 3 detects the advance of the train becomes distant by the lower amount. This means that the signal display for the following trains will be delayed by that amount,
If the track circuit 2T is long, it does not matter so much. Rather, when the frequency of the train detection signal received by the receiver 3 is low, attenuation of the train detection signal is small and leakage conductance of the track circuit is large. It can be made long, and a long track circuit with a length of 2 to 3 km can be constructed. In addition, even if the signal display up for the following train is delayed,
The signal display can be speeded up.

Although the above embodiment has been described with reference to the case where the modulator 10 is provided in the signal wave generator 4 of the transmitter 1, as shown in the block diagram of FIG. 3, the signal wave generator 4 is relatively expensive. twenty five
Even if the frequency mixer 10a for mixing the carrier wave of the frequency FH1 of KHz and the carrier wave of the frequency FL1 of 1 KHz, which is relatively low, is provided, the same operation as in the above embodiment can be achieved.

[0018]

As described above, the present invention alternates between a relatively high frequency and a relatively low frequency as a train detection signal from a transmitter provided in an intermediate portion near the approach side of a train detection section. Frequency-shift keying modulated and transmitted, and the receiver installed at the approach end is designed to receive only the high-frequency train detection signal at a relatively short distance from the transmission point. It is possible to reduce the attenuation of the high frequency train detection signal received by. Since the receiver on the approach side detects the train by the train detection signal of the relatively high frequency with little attenuation, the boundary of the approach point can be made clear.

Further, since the receiver provided at the advance end receives only the train detection signal of a relatively low frequency with little attenuation, the distance from the transmission point to the advance point is lengthened. 3K from the conventional maximum 800mm
It can be as long as m.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram of the above embodiment.

FIG. 3 is a block diagram showing another embodiment.

[Explanation of symbols]

 1 transmitter 2 receiver 3 receiver 4 signal wave generator 7 oscillator 8 oscillator 9 oscillator 10 modulator 10a frequency mixer 12 bandpass filter 16 bandpass filter

Claims (1)

[Claims] 1. A voltage having a transmitter (1) provided in an intermediate portion near the approach side of the train detection section and receivers (2) and (3) provided at both terminals of the train detection section, respectively. A non-insulated track circuit device of a power transmission / reception system, wherein a transmitter (1) transmits a train detection signal, and has a signal wave generator (4) and a transmitter (5). (4) is for generating a train detection signal including two different frequencies, and an oscillator (7) for generating a carrier of a relatively high frequency, an oscillator (8) for generating a carrier of a relatively low frequency, Transport generated by both oscillators (7) and (8)
Modulator that frequency-shift-modulates each transmitted wave with a fixed period
(10) , and the transmitter (5) has a signal wave generator (4)
The train detection signal generated in 1) is transmitted, and the receiver (2) provided at the approach end receives the train detection signal transmitted to the approach side.
2) and a signal receiver (13), and a bandpass filter (12)
Is a relatively high-frequency train detection signal, and the signal receiving unit (13) receives the relatively high-frequency train detection signal sent from the bandpass filter (12). (3) receives the train detection signal transmitted to the advancing side, and the band filter (1
6) and a signal receiving unit (17), and a bandpass filter (16)
Voltage transmission / reception system characterized in that only the train detection signal of relatively low frequency is passed, and the signal receiving unit (17) receives the train detection signal of relatively low frequency sent from the bandpass filter (16). Non-insulated track circuit device.