JPS6052020B2 - Vehicle detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a vehicle detection system that detects the presence of a vehicle in each section formed by dividing the path when a vehicle having insulating wheels such as rubber tires moves along a predetermined path. It is related to the device.

Conventionally, railway vehicle detection uses an electrical short circuit between the rails of an axle, in which a signal current is passed between both rails in a rail section formed by insulating the rails, and this signal current is used to receive signals. If the signal current is bypassed by the axle, the signal current to the signal receiver disappears, so this is detected by the signal receiver, and the signal current is However, in vehicles with insulated wheels such as rubber tires, it is not possible to short-circuit the axle, making it impossible to detect the vehicle by the above-mentioned means. 1 Vehicle Detection Device J (Patent Application No. 55-8507 filed separately by the applicant)
No. 7 (Japanese Unexamined Patent Publication No. 57-11167), etc., a vehicle transmits signals of different frequencies called a check-in signal and a check-out I signal, respectively.
A method has been proposed in which this signal is received by a loop-shaped antenna installed in a vehicle path, thereby detecting the presence of a vehicle in a specific section.

However, when using such means, if the transmission of the check-in signal stops due to the occurrence of a failure, etc., it becomes impossible to detect the entry of a vehicle into a specific section. Since it is necessary to switch branches based on the assumption that there are no vehicles in the area, if the transmission of the check-in signal stops, it is possible to switch branches even though a vehicle is entering the area. In the worst case, the switch may occur while the vehicle is passing over the branch, resulting in the vehicle overturning, which has serious drawbacks.

The present invention has the purpose of fundamentally solving such drawbacks of the conventional technology, and when the check-in signal transmission from the vehicle stops, the section adjacent to the front of the section where the vehicle is present is automatically closed off. This provides a highly effective vehicle detection device.

Therefore, in order to achieve this object, the present invention provides an antenna for transmitting a check-in signal provided at the front part of a vehicle, a check-in transmitter for supplying a check-in signal to this antenna, and a check-in transmitter provided at the rear part of the vehicle. an antenna for transmitting a checkout signal provided to the antenna, a checkout transmitter for supplying the checkout signal to the antenna, and a checkout transmitter provided opposite to each antenna in each section of the vehicle passageway and over the entire area within the section. a section loop, a check-in receiving section and a check-out receiving section provided for each section that detect the check-in signal and check-out signal received by this loop, and a check-in receiving section and a check-out receiving section in both adjacent sections. In a vehicle detection device comprising a block logic section that detects the presence of a vehicle based on the detection power of the check-in reception section and the block logic section that detects the presence of a vehicle based on the detection power of the check-in reception section and the A first relay that responds to the detection forces of the checkout receiving unit in one section when they occur simultaneously and maintains itself to detect that the front part of the vehicle has entered the second section, and this first relay is in a detection state. When the respective detection forces of the check-in receiving section and the check-out receiving section in the second section occur simultaneously after the detection force of the check-in receiving section and the check-out receiving section occur at the same time, the system automatically maintains itself and detects that the rear part of the vehicle has entered the second section. A second relay cancels the detection state of the first relay, and after this second relay enters the detection state, the detection power of the check-in receiving section disappears in the second section and the detection power of the check-out receiving section occurs. a third relay that responds and holds itself when the check-in signal from the vehicle disappears in the second section, and a third relay that is in a non-detection state and adjacent to the front of the second section. When each detection force of the check-in receiving section and the check-out receiving section in the section is in the disappearing state, self-holding is performed and the third section is set in the unblocked state, and the self-holding is released by the detection operation of the third relay and the third section is blocked. A block logic section is constituted by the fourth relay which is set to the state.

FIG. 1 is a block diagram showing the entire configuration. In this case, an antenna ANTl for transmitting a check-in signal and an antenna ATC (Aut
OmaticTrainCONtrOl. ) An antenna ANT2 for receiving a signal is provided, and an antenna ANT3 for transmitting a checkout signal and an antenna ANT4 for receiving an ATC signal are provided at the lower rear of the vehicle V.

However, since the switches Sl and S2 of the antennas ANTl and ANT3 are changed according to the change in the traveling direction of the vehicle, the antennas ANTl and ANT3 have checkout transmitters TXil and TXl2 that supply check-in signals, and checkout transmitters TXil and TXl2 that supply check-out signals. TXOl, TXO2. A check-in signal is supplied when the vehicle is on the forward direction side, and a check-out signal is supplied when the vehicle is on the opposite side to the forward direction.

Also, the antennas ANTl~ANT, facing the vehicle ■
A loop antenna-like section loop L is provided in each section and over the entire section in the passage R, and receives the check-in signal and check-out signal from the antennas ANT1 and ANT3. Along with A.T.
This section loop L, the detection receiving section RXd, and the ATC transmitting section TXa are configured to transmit the C signal.
are connected via. Detection reception unit Xd includes check-in reception unit RXi and check-out reception reception unit λXO.
These detect the check-in signal and the check-out signal, and provide the detection power D, to the blocking logic section.

Note that the detection receiving section RXd and the ATC transmitting section TXa are as follows:
The block logic section (2) is provided for each section, and the detection power DO of the adjacent section is also given to the block logic section (2), which judges the section block state according to the logic configuration described later, gives a command to the ATC transmitter TXa, and sends a command to the ATC transmitter TXa. When this stop signal is received by the ATC receivers RXal and RXa2 of the vehicle (2), a message to that effect is displayed on the in-vehicle signal devices SD1, SD2, and this information is sent to the logic devices LEl, LE2.
It is designed to control brake operations, etc.

In addition, in order to ensure safety, in order to detect a failure in the section loop L or the detection/reception signal X, the reference signal from the reference signal transmitter TXr is sent to the section loop L via the matching transformers MT3, MT. , which the check-in receiving unit RXi constantly receives.

FIG. 2 is a block diagram showing the configuration of check-in reception deposit λXi, and in order to improve reliability, check-in receiver R
Two Xil and RXj2 are installed in parallel, and the relays 1N1 and IN2 are always activated by detecting the reference signal.
As described later, when the check-in signal from vehicle ■ is given, the detection force disappears, so relays 1N1 and 1N2
When both are restored, the relay 1N as a check-in relay is restored by opening the operating contacts 1N1 and IN2, and its contact output indicates the detection of the check-in signal. In addition, in order to reliably detect that only the check-in signal has disappeared, a check-in receiver RXi3 is provided, and relay ■ is activated only when the check-in signal arrives, and the contact output of this activates the check-in receiver RXi3. is also used to indicate the detection of a check-in signal.

FIG. 3 is a block diagram showing details of the check-in reception deposit λXil, in which the reference signal selected by the band p-wavelength filter BPFl is amplified by the voltage amplifier VA, and subjected to amplitude limitation in the limiter LM. After envelope detection is performed by the wave detector DT, the low frequency of the envelope component is extracted by the bandpass filter BPF2, and after driving the Schmitt trigger SCH to become a square wave, it is amplified by the power amplifier PA. , becomes direct current through transformer T and rectifier RE, operating relay 1N1.

Note that the check-in receiver RXi2 also has a similar configuration.

FIG. 4 shows the detection status of the verification signal and the check-in signal, taking the check-in receiver RXil as an example, and showing the signal waveforms of each part.

In other words, the reference signal Sr 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, the amplitude is 1.
It becomes a pulse-like signal of FC/2, and from this it is sent to the bandpass filter B.
By extracting the square wave component using PF2 and driving the Schmitt trigger SCH, a square wave having a pulse width corresponding to the threshold level SL can be obtained.

In this state, when the check-in signal Si, which is only a carrier wave having a frequency different from that of the reference signal Sr, also passes through the bandpass filter BPFl and is mixed, (Sr+S1)
As shown in , the modulation degree of the square wave with respect to the carrier wave apparently decreases and the maximum amplitude increases. When this is limited to the amplitude VC by the limiter LM, the square wave component decreases and the bandpass waveform filter BPF2 increases. Output is limited ●Trigger S
The CH threshold) does not reach the hold level SL, and no square wave appears in its output.

Therefore, the relays 1N1 and IN2 in FIG. 2 operate when only the check signal Sr is given, and restore to 7 when the check-in signal Sj is mixed therewith.
As a result, the approach of the vehicle V can be detected, and even if the inspection signal Sr is disconnected, the state is restored, and the same state as the approach of the vehicle (2) is detected.

FIG. 5 is a block diagram showing details of the check-in receiver RXi3, in which the check-in signal Sr is transmitted from the output of the band filter BPFl to the band filter BPF3 that passes only the frequency of the check-in signal Si. Extract only
The voltage is amplified by a voltage amplifier ■A, and then a Schmitt trigger SCH is driven, and its output operates an AC-operated relay N via a drive circuit DR.

Furthermore, the check-out signal uses a carrier wave with a different frequency from that of the check-in signal, which is amplitude-modulated by a predetermined low frequency signal, and is transmitted by the check-out receiving section RXO having almost the same configuration as that shown in Fig. 3. , detection is performed.

Figure 6 shows section 1 formed by dividing path R for vehicles.
As the vehicle proceeds from T to 4T from section 1T to section 3T, section 1T becomes the adjacent first and second sections.
and relays 1T0uT and 2T0UT1 of the checkout receiving unit RXO at 2T, and the check-in reception m? in the second section 2T and the section 3T as the third section adjacent to the second section 2T? Xi's relay 2T! N, 2
T! N, 3T! N, 3TIN works, H
indicates operation, and L indicates recovery.

Note that ABR to 3TR are each relay of the block logic section shown in FIG.

In other words, the relays 2T1N in sections 2T and 3T are constantly operating based on the reference signal, and the front part of the vehicle is in section 2.
When the vehicle V enters section 2T and enters state 1, the check-in signal restores relay 2TIN, and at the same time relay 2TIN operates, and when the vehicle V completely enters section 2T and enters state 2, the check-out signal is activated at section 1T. Relay 1T0uT disappears and is restored, and relay 2T starts transmitting a checkout signal to section 2T.
0uT works.

Also, failure in condition 3 in section 2T! If transmission of check-in signal stops due to etc., relay 2Tx
At the same time that N is activated again, relay 2T is restored, thereby detecting the disappearance of the check-in signal.

Note that a branch P is provided in the section 3T, and if the vehicle enters the section 3T without transmitting the check-in signal and enters the state 4, this will not be detected and the vehicle V will proceed further. Since there is a risk that the branch will be switched even if the process continues, the block logic circuit shown in FIG. 7 causes the section 3T to enter the block state.

Figure 7 shows the above relays 1T0uT, 2TTN, 2T0
UT, 3T! Based on the operation and recovery of N and 3TON, the operation and recovery of relays 3T0UT and 4T01JT of the checkout receiving unit RXO in sections 3T and 4T, and the operation and recovery of relay 4'1R in section 4T, which is similar to relay 3TR, It is a circuit diagram of the block logic part LG which performs block control of 3T, and the case where it is comprised by the mechanical relay is illustrated.

In addition, relay 3TR is for the switch machine of branch P,
This is a block relay that commands to block the switching operation when the block enters or exists in the section 3T, and is initially operated by the preset switch circular operation and self-maintained by its own operating contact 3TR1. At times, a switching enable signal is sent to the switch M by means of the operating contact 3TR2.

That is, when the state is 1 in FIG. 6, the relay ABR as the first relay is activated by closing the operating contact 2T.
operates in response and performs self-holding by its own operating contact ABRl, thereby causing the front part of the vehicle to move to section 2.
It is detected that the vehicle has entered T, and in state 2 in FIG. As a result, it is detected that the rear part of the vehicle V has entered the section 2T, and the relay ABR is restored by opening the restoration contact 0KR1, and the detection state is canceled.

Furthermore, if the check-in signal disappears in state 3 in FIG. 6, the third
Relay 1NCH as a relay operates in response and performs self-holding with its own operating contact 1NCH1, thereby detecting that the check-in signal has disappeared.

Then, the relay 3TR as the fourth relay is restored by opening the restoration contact 1NCH2, and the operating contact 3TR2 is opened to stop sending the switchable signal to the switch M, and instruct the block of the section 3T.

Therefore, if the transmission of the check-in signal stops in section 2T, section 3T becomes blocked, and the switching operation of branch P is blocked.

In addition, relay ABR operates on the assumption that operation contact 1T0UT1 is closed, and performs self-holding on the condition that recovery contact 0KR1 is closed, and relay 0KR operates on the assumption that operation contact 1T0UT1 is closed.
BR2, 2T completed. It operates on the assumption that the recovery contact 3TTN1 is closed, and performs self-holding on the condition that the recovery contact 3TTN1 is closed.
Relay 1NCH operates on the premise that operation contacts 0KR3, 2T0UT2 and recovery contact 3TTN2 are closed, and each detection operation is ensured.

Note that when relay 1NCH operates and performs self-holding, it is configured to be restored by reset switch RS after confirming that transmission of the check-in signal has resumed.

In addition, relay 3TR has recovery contacts 1NCH2, 3T0uT
1. Operation and self-holding by the preset switch PS are possible on the premise that the operating contact 3T41 is closed, and each of these contacts 1NCH2, 3T! Nl, 3
When TOUTl is closed, recovery is achieved by opening either the recovery contact 4TR1 or the operating contact 4T0UT1, while operation and self-maintenance are performed by closing these contacts. Section 3T depending on availability
Blocking and unblocking are being carried out.

Therefore, if the check-in signal disappears for some reason, the section adjacent to the section in front of the section in which vehicle (2) is present will automatically become blocked, and the switching operation of branch P will be reliably blocked. Vehicle operation safety is ensured.

In addition, the configuration shown in FIG. 7 may use a highly reliable semiconductor logic circuit, and the forms of the verification signal, check-in signal, check-out signal, etc. can be arbitrarily selected depending on the conditions. Accordingly, the check-in receiving section R
The configurations of Xi and the checkout receiving unit RXO may be determined.

Also, relay 2T! N, 3T! N, etc. are used to monitor the presence or absence of a failure in the receiving system by detecting a check signal, but the operating contacts and recovery contacts of relays 2T, N, 3T, and N are replaced with the recovery contacts and operating contacts of relays 2TIN and 3TIN. However, the present invention can be modified in various ways, such as the possibility of omitting the check-in receiver RXi3.

As is clear from the above explanation, according to the present invention, the front section is blocked by the disappearance of the check-in signal, so the safety in vehicle operation is significantly improved, which is noticeable in new transportation systems using rubber tires. Effects can be obtained.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a block diagram of the entire configuration, Fig. 2 is a block diagram of the check-in receiver, Fig. 3 is a block diagram of the check-in receiver, and Fig. 4 is a check signal and a waveform diagram showing the detection status of the check-in signal, No. 5
The figure is a block diagram of a check-in receiver that detects only the check-in signal, and Figure 6 is a time chart showing how each relay operates or restores depending on the position of the vehicle.
FIG. 7 is a circuit diagram of the block logic section. ■・・・・・・Vehicle, TXil, TXi2・・・・・・
Check-in transmitter, TXOl, TXO2...
Checkout transmitter, ANTl, ANT3...
・Antenna, L... section loop, RXi...
... Check-in receiving section, RXO... Check-out receiving section, LG... Block logic section, IN
・・・・・・Check-in relay, 0UT・・・・・・
Checkout relay, ABR...1st relay, 0KR...2nd Ronoray, INCH...
...3rd relay, 3TR...4th relay.

Claims (1)

[Claims] 1. An antenna for transmitting a check-in signal provided at the front part of the vehicle, a check-in transmitter supplying the check-in signal to the antenna, and an antenna for transmitting a check-out signal provided at the rear part of the vehicle. a checkout transmitter that supplies the checkout signal to the antenna; a section loop provided for each section and over the entire section of the vehicle passageway facing each of the antennas; and the loop. a check-in receiving section and a check-out receiving section provided in each section for detecting the check-in signal and check-out signal received by the check-in receiving section and check-out receiving section for detecting the check-in receiving section and the check-out receiving section in both adjacent sections; and a block logic unit that detects the presence of the vehicle based on the presence of the vehicle in the first and second sections adjacent to each other.
When the detection force of the check-in receiving unit in the section and the detection force of the check-out receiving unit in the first section occur simultaneously, the vehicle maintains itself in response and the front part of the vehicle enters the second section. a first relay that detects this, and a self-holding device that responds to and maintains itself when the respective detection forces of the check-in receiving section and the check-out receiving section in the second section occur simultaneously after the first relay enters the detection state. and detecting that the rear part of the vehicle has entered the second section and canceling the detection state of the first relay.
a relay, and when the detection force of the check-in receiving section in the second section disappears and the detection force of the check-out receiving section is generated after the second relay enters the detection state, the second relay responds to the detection force of the check-in receiving section; a third relay that maintains the check-in signal from the vehicle in the second section and detects that the check-in signal from the vehicle disappears;
When each detection force of the check-in receiving section and the check-out receiving section in a third section adjacent to the front of the section is in a state of extinction, self-holding is performed and the third section is set in a state of unblocking, and a detection operation of the third relay is performed. A vehicle detection device characterized in that the blocking logic section is constituted by a fourth relay which releases self-holding and puts the third section into a blocking state.