JPS6212070B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention detects the presence of a vehicle in each section formed by dividing the route when a vehicle having insulating vehicles such as rubber tires travels on a predetermined route. This invention relates to a vehicle detection device that blocks a section into which a following vehicle cannot enter.

Conventionally, railway vehicle detection uses an electrical short circuit between the rails caused by an axle, and a signal current is passed between both rails in a track section formed by insulating the rails, and this signal current is sent to a signal receiver. When the signal current is bypassed by the axle, the signal current flow to the signal receiver disappears, so this is detected by the signal receiver, and based on this detection output, the corresponding track section is The building was closed.

Therefore, when a vehicle enters a track section and then retreats from the track section, the bypass of the signal current through the axle disappears, and the flow of the signal current to the signal receiver is restored. , the blockage condition is immediately released and vehicles are allowed to re-enter the track section.

Therefore, according to the conventional vehicle detection means using an axle short circuit, even if a vehicle enters a track section further ahead due to overrunning from a track section where the vehicle is stopped at a station, etc., the vehicle will not be able to reach the track section due to backing up. The blockage condition in the section was immediately lifted and did not cause any problems.

However, in vehicles using insulated wheels such as rubber tires, it is not possible to short circuit the axle, making it impossible to realize a vehicle detection means with the above-mentioned function. ``Vehicle detection device'' (patent application filed in 1983)
−85077 (Special Publication No. 52019 of 1983), Patent Application No. 1983-
154465 (Special Publication No. 52020 of 1983), Patent Application 1983-
120396 (Japanese Unexamined Patent Publication No. 58-21135)), etc. have been proposed.

However, in both of these, a check-in transmitter and a check-out transmitter are individually installed on the vehicle, and a check-in signal is transmitted from an antenna installed at the front of the vehicle, and a check-in signal is transmitted from an antenna installed at the rear of the vehicle. The system is designed to transmit a check-out signal, and a receiver for the check-in signal and a receiver for the check-out are installed in response to this, realizing the same function as detecting a vehicle due to an axle short circuit. In addition to requiring two individual transmitters, the circuit configuration of the block logic section becomes complicated.

For this reason, the following vehicle detection device has been proposed, thereby achieving a simplified configuration.

That is, as shown in the block diagram of the entire configuration in Fig. 1, an antenna ANT ₁ for transmitting on-board signals and an ATC
(Automatic Train Control.) An antenna ANT ₂ for receiving signals is provided, and an antenna ANT ₃ for transmitting on-board signals is provided at the lower rear of the vehicle V.
An antenna ANT ₄ is provided for receiving ATC signals.

However, antennas ANT ₁ and ANT ₃ are simultaneously supplied with on-vehicle signals of a specific frequency from a common on-board transmitter TX _v , and antennas ANT ₁ and ANT ₃ transmit on-vehicle signals as being in phase with each other. It has become a thing.

In addition, in the passage R of the vehicle V facing the antennas ANT ₁ to _{ANT 4} , a loop antenna-like section loop L is provided for each section and over the entire area. ₁ , receives on-vehicle signals from ANT ₃ , and transmits ATC signals used for speed control of vehicle V. This section loop L, detection receiving section RX _d and ATC transmitting section TX _a is the matching transformer MT ₁ ,
MT ₂ and is coupled via the three-turn transformer HYB.

The detection receiving unit RX _d is composed of a suppression receiver RX _d1 and an on-board signal receiver RX _d2 , and these detect the superposition of the reference signal and the on-board signal, which will be described later, and detect only the on-board signal. The detection output D _s is given to the block logic section LG.

In addition, the detection receiver RX _d and the ATC transmitter TX _a
is provided for each section, and the similarly provided block logic section LG has the self-section detection force D _s
A detection output D _c of the adjacent section ahead is also given, and based on these, the logic section LG uses a logic configuration such as a relay circuit to detect the vehicle V and determine the section blockage state, and sends the ATC transmission section TX. _A is given a command to transmit a stop signal from the transmitter TX _a , and when this stop signal is received by the ATC receivers RX _a1 and RX _a2 of the vehicle V, a signal to that effect is sent to the in-vehicle signal devices SD ₁ and SD ₂ . In addition to displaying
This information is given to logic devices LE ₁ and LE ₂ to control brake operations and the like.

In addition, to ensure safety, in order to detect a failure in the section loop L or the detection receiver RX _d , a reference signal having a frequency different from that of the on-board signal from the reference signal transmitter TX _r is sent to the matching transformers MT ₃ and MT. ₄ to the section loop L, and is constantly received by the suppression receiver RX _d1 .

FIG. 2 is a block diagram showing the details of the suppression receiver RX _d1 . The reference signal selected by the bandpass filter BPF ₁ is amplified by the voltage amplifier VA, subjected to amplitude limitation in the limiter LM, and then detected. After envelope detection is performed by the detector DT, the low frequency of the envelope component is extracted by the bandpass filter BPF ₂ , which drives the Schmitt trigger SCH to become a square wave, which is then amplified by the power amplifier PA. , becomes direct current through transformer T and rectifier RE, operating relay ING.

FIG. 3 shows the state of superimposition detection of the reference signal and the on-vehicle signal, and the signal waveforms of each part are appended.

In other words, the reference signal S _r is an intermittent wave obtained by amplitude modulating the carrier wave with a square wave, and if this is limited to the amplitude VC by the limiter LM and then envelope detection is performed, a pulsed signal with an amplitude of VC/2 is obtained. Then, by extracting the square wave component from this using the bandpass filter BPF ₂ and driving the Schmitt trigger SCH, a square wave with a pulse width corresponding to the threshold level SL is obtained.

In this state, when the on-board signal S _v containing only the carrier wave is mixed, the modulation degree of the square wave with respect to the carrier wave apparently decreases and the maximum amplitude increases, as shown as S _r +S _v . When the limiter LM limits the amplitude to VC, the square wave component decreases,
The output of the bandpass filter PBF ₂ is the Schmitt trigger.
The SCH threshold level SL is not reached and no square wave appears in its output.

Therefore, the relay ING in FIG. 2 operates when only the reference signal S _r is given, and recovers when the onboard signal S _v is superimposed on it, thereby preventing the vehicle V from entering. It can be detected, and it can be recovered even if the reference signal S _r is disconnected, so that the same state as the entry of the vehicle V is detected.

The on-board signal receiver RX _d2 only needs to receive on-board signals and operate the relay INT in response to the detection of the on-board signals. By adding a container, a configuration substantially similar to that shown in FIG. 2 can be applied.

Therefore, if the block logic section is configured appropriately,
The result is exactly the same as the detection of a vehicle due to an axle short circuit, and the section is blocked only when a vehicle V is present in the section.

However, in the configuration shown in Figure 1, although there is an ATC transmitter TX _a that requires a reference signal transmitter TX _r and constantly transmits continuously, it is not used for the reference signal. , which had the disadvantage of complicating the configuration.

The present invention has the purpose of fundamentally eliminating such drawbacks of the conventional art, and eliminates the reference signal transmitting section and uses an ATC transmitting section instead, and also uses a detection receiving section.
The object of the present invention is to provide an extremely effective vehicle detection device that improves the configuration of RX _d and obtains results exactly similar to those shown in FIG. 1 with a simple configuration.

The details of the present invention will be explained below with reference to the block diagram of FIG. 4 showing an embodiment.

Figure 4 is a block diagram similar to Figure 1, but
Eliminates the reference signal transmitter TX _r and replaces it with an ATC transmitter
TX _a is connected to a matching transformer MT ₃ , which generates a reference signal S _r modulated by a square wave for speed control.
The ATC signal with _{a waveform equivalent} to that of Upper transmitter TX _v
It is also designed to receive on-vehicle signals from the station.

However, while the on-board signal received by section loop L is at a low level of about -13 to -10 dBm, the ATC signal via section loop L is +37 to -10 dBm.
Since the level is as high as +40 dBm, if this signal is directly applied to the suppression receiver RX _d1 , it will be impossible to accurately detect the superposition of both signals.

Therefore, the output of the matching transformer MT ₂ is transferred to the band wave transformer used as the first and second wave transformer.
It is given to BPF ₃ and BPF ₄ , and the bandpass filter
BPF ₃ extracts the ATC signal, while bandpass filter BPF ₄ extracts the onboard signal.
ATC by attenuator ATT connected in series with BPF ₃
In addition to attenuating the signal to almost the same level as the on-board signal, the bandpass filter BPF ₃ passes through the attenuator ATT.
mixer MIX the output of BPF 4 and the output of bandpass filter BPF ₄
After mixing, the signal is applied to the suppression receiver RX _d1 .

Therefore, instead of the reference signal S _r in Fig. 3, the ATC signal, which is at almost the same level as the onboard signal _S
Since the signal is given and the on-board signal S _v is given when the vehicle V enters the section,
The superposition of both signals is detected as shown in Figure 3, and the relay
ING will be restored.

Furthermore, the on-board signal receiver RX _d2 is connected to the output side _of the bandpass filter BPF ₄ , and only the on-board signal S _v is given to the receiver RX _d2 .
Relay INT operates upon detection of .

In other words, if a vehicle V enters or exists in the section, relay ING is restored and relay INT is activated. By providing these detection receiving units RX _d for each section, Vehicle detection is carried out, and relay ING is carried out for each section.
If a block logic unit LG that responds to the operation and recovery status of the INT is provided, it will be controlled by this.
The ATC signal from the ATC transmitter TX _a can block the section into which the vehicle V has entered or exists, and also block the section where the vehicle V has entered or exists.
If the person escapes, the blockage condition can be immediately released.

However, by configuring the block logic unit LG to release the block state of the section by detecting a vehicle in the section ahead adjacent to the section, once the section is in the block state,
Even if a fault occurs in the bandpass filter BPF ₄ in any section and vehicle detection becomes impossible, when the vehicle V enters the faulty section, the adjacent rear section will remain blocked. It can prevent a rear-end collision with a following vehicle.

Note that the format of the ATC signal and the on-board signal can be arbitrarily selected depending on the conditions, and the suppression receiving section RX _d1 and the on-board signal receiving section
All you need to do is determine the configuration of RX _d2 , and the bandpass filter BPF ₃ ,
The same effect can be achieved even if a high frequency device, a low frequency device, etc. are used as the BPF ₄ , and the present invention can be freely modified in various ways.

As is clear from the above explanation, according to the present invention, even in a vehicle using insulated wheels, vehicle detection, which has exactly the same function as the vehicle detection means using an axle short circuit, can be performed reliably and accurately with a simple and minimal configuration. Because it is carried out on a regular basis, significant effects can be obtained in new transportation systems that use rubber tires.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the entire configuration showing a conventional example, Fig. 2 is a block diagram of the suppression receiver in Fig. 1,
FIG. 3 is a waveform diagram of a situation in which the suppression receiver of FIG. 2 detects a reference signal and an on-vehicle signal, and FIG. 4 is a block diagram of the entire configuration showing an embodiment of the present invention. V...Vehicle, TX _v ...Vehicle transmitter, ANT ₁ ,
ANT ₃ ...Antenna, L...Section loop, RX _d1 ...
...Suppression receiver, RX _d2 ...Onboard signal receiver, TX _a
...ATC transmitter, BPF ₃ , BPF ₄ ...bandwidth wave transmitter,
ATT...Attenuator, MIX...Mixer, ING, INT...
…relay.

Claims (1)

[Claims] 1. An on-board signal transmitting antenna that transmits mutually in-phase signals to the front and rear parts of the vehicle, an on-board transmitter that simultaneously supplies signals to each of the antennas, and each of the above-mentioned antennas. a section loop provided oppositely to the vehicle passage for each section and over the entire section; a reference signal transmitter that supplies a reference signal to the loop; a suppression receiver provided for each section that detects superimposition with a reference signal; an onboard signal receiver provided for each section that detects only the onboard signal received by the loop; a blocking logic unit provided for each section and detecting a vehicle based on the respective detection forces of the suppression receiver and the on-board signal receiver of the self section and the front adjacent section, and blocking the section where the vehicle is present; In the vehicle detection device comprising: an ATC transmitter that constantly supplies a speed control signal for the vehicle having a waveform equivalent to the reference signal to the loop instead of the reference signal transmitter; and an ATC transmitter that extracts the speed control signal via the loop. a first wave device; a second wave device that extracts the on-board signal received by the loop and supplies it to the on-board signal receiver; and a second wave device that is connected in series with the first wave device and outputs the speed control signal. an attenuator that makes the level approximately the same as that of the on-board signal, and a mixer that mixes the output of the first wave generator and the output of the second wave generator via the attenuator and supplies the mixture to the suppression receiver. A vehicle detection device characterized in that it is provided for each of the sections.