JPS5871258A - Car detector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention provides a vehicle having an insulating vehicle such as a rubber tire.
When driving on a predetermined path, a vehicle detects the presence of m vehicles in each section formed by dividing the path, and places the section into which the vehicle has entered into a blocked state where subsequent vehicles cannot enter. The present invention relates to a detection device.

Conventionally, to detect the width of a railway vehicle, an electrical short circuit between the rails by an axle is used.
The signal current is received by a signal receiver, and when the signal current is bypassed by the axle, the signal current flow to the signal receiver disappears. Based on this, the relevant track section was blocked.

Therefore, after a vehicle enters a track section, when it retreats from the track section, the bypass of the signal current through the axle disappears due to the force exerted by the vehicle, and the flow of the signal current to the signal receiver is restored. As a result, the blockage condition is released and vehicles are allowed to re-enter the track section.

Therefore, with the conventional vehicle detection means using axle short circuit, for example, if the vehicle is overrunning from the track section where it stops at a station, etc.
Even if the vehicle entered the track section ahead, the blockage of the track section was immediately released by reversing, and no problems were caused.

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.
As a countermeasure for this, a "vehicle detection device" (patent application No. 55-85077, % application No. 55-15) was proposed separately by the applicant.
4465, Japanese Patent Application No. 56-120396), 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 the check-in signal is transmitted from an antenna installed at the front of the vehicle, and a check-in transmitter is installed at the rear of the vehicle. The check-out signal is transmitted from the antenna, and a receiver for the check-in signal and a receiver for the check-out are installed in response to this, and functions such as vehicle detection and rotation due to axle short circuit are realized.

As a result, two individual 1"f:: signals are required on the vehicle, and the circuit configuration of the block logic section becomes complicated.

For this reason, the vehicle detection device described below has been proposed to realize a simplified configuration.

As shown in the block diagram of the entire configuration in Figure 1,
At the lower front of the vehicle V, there are installed an antenna ANT1 for signal transmission, and an ATC (Automatic
cTrain Control,) An antenna ANT2 for signal reception is provided, and an antenna ANT3 for transmitting a train signal and an antenna ANT4 for ATC monthly reception +j are provided at the lower rear of the vehicle V.

However, antennas ANTI and AN'r3 are simultaneously supplied with on-vehicle signals of specific frequencies from a common on-vehicle transmitter TXv, and the on-vehicle signals are transmitted to antennas ANTI and AN'r3 in phase with each other. It is to be transmitted by ANT3.

-Furthermore, in the path R of the vehicle V facing the antennas ANT1 to ANT4, a loop antenna-shaped section loop L is provided for each section and over the entire area.
The VC receives the on-vehicle signal from the antenna ANT] and AN'l'3, and also transmits the ATC signal used for speed control of the vehicle V, and this section loop L and the detection receiving section RXd and ATC transmitter TX
a through matching transformers MT1, M'j'2 and a three-turn transformer HYB.

The detection receiving unit RXd is composed of a suppression receiver RXd1 and an on-board signal receiver RXd2, and these detect the superposition of a reference signal and an on-board signal, which will be described later, and detect only the on-board signal. Logic part L that blocks the output
I am giving it to Q.

Note that the detection receiving section RXd and the ATC transmitting section TXa,
The block logic unit LG is provided for each section, and the detection output DC of the adjacent section is also given to the block logic unit LG, which determines the block state of the section using a logic configuration such as a relay circuit.
A command is given to X & to send a stop signal from the transmitter TX, and this stop signal is transmitted to the vehicle W) ATC receiver RX, 1.
, RX,2, the on-board signal SDI
, SD2 is displayed to that effect, and the information is given to the logic devices LEI and LE2 to control brake operations and the like.

In addition, for safety reasons, section loop L to detection receiving section R
In order to detect a failure in It is constantly receiving data.

FIG. 2 is a block diagram showing details of the suppression receiver RXdl, in which the reference signal selected by the bandpass transducer BPFI is not amplified by the voltage amplifier VA, and is further limited by the limiter LM. Since there is no envelope detection from the wave detector DTI/C, the low frequency of the envelope component is extracted by the wave detector BPF2, and after driving the Schmitt trigger SCH to generate a square wave, the power amplifier It is amplified by PA, becomes direct current through transformer T and rectifier RE, and operates relay ING.

FIG. 3 1 shows the state of superimposition detection of a reference signal and an on-vehicle signal, and the signal waveforms of each part are appended.

In other words, the reference signal (Sr) is an intermittent wave obtained by changing the amplitude of the carrier wave using a square wave, and this is transmitted to the limiter LM.
If we perform envelope detection after limiting the amplitude to VC by
This becomes a pulse-like signal with an amplitude of VC/2, from which a square wave component is extracted by a bandpass waveform generator BPF2, and a square wave with a pulse width corresponding to the threshold level SL for driving the Schmitt trigger 5C) is obtained. It will be done.

In this state, when the on-board signal (SY) containing only the carrier wave is mixed, as shown as (Sr + Sv), 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 output of the bandpass filter BPF2 does not reach the threshold level SLt of the Schubat trigger SCH, and a square wave appears in its output. I feel so angry.

Therefore, the reference signal (sr
) is given, and to this the onboard signal (
Since 11 is restored when SV) is superimposed, it is possible to detect the approach of vehicle ■, and it is also restored when the reference signal (Sr) is disconnected, so that the same state as the approach of vehicle V is detected. .

The on-board signal receiver RXd2 only needs to receive on-board signals and operate the Rin-INT in response to the detection of the on-board signals, and the on-board signal receiver RXd2 only needs to operate the Rin-INT in accordance with 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 blockage logic section is configured appropriately, a result exactly similar to vehicle detection due to an axle short circuit can be obtained, and the section will be closed only when a vehicle V is present in the section. Totoru.

However, in the configuration shown in FIG.
Although there is an ATC transmitter TX that requires r and always performs continuous transmission, it does not utilize h as the reference signal, resulting in the disadvantage that the configuration becomes complex.

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 in its place, as well as improving the configuration of the detection receiving section RXd and making it simple. The object of the present invention is to provide an extremely effective vehicle detection device that achieves results exactly similar to those shown in FIG. 1 due to its configuration.

Below, the present invention will be explained in detail with reference to the block diagram of FIG. 4 showing an embodiment.

FIG. 4 is a block diagram similar to FIG. 1, but the reference signal transmitter TXr is eliminated, and instead the FcATC transmitter TXa is connected to the matching transformer MT3, thereby modulating the hlATc with a square wave for speed control. The detection/receiving unit RXd constantly receives ATC signals via matching transformers MT and MT2, and also receives signals from the on-board transmitter TXv via section loop L. It is also designed to receive signals from above.

However, the on-board signal received by section loop L is -1
The ATC signal via section loop L is at a low level of about 3 to -10 dBm, whereas the ATC signal via section loop L is at a low level of about +37 to +40 dBm.
Since the level is as high as Bm, if this is applied to the distortion suppression receiver RXdl, it will be impossible to accurately detect the superposition of both signals.

Therefore, the output of the matching transformer MT2 is
Band P-wave device BPF3°BPF used as an offshore wave device
4, and ATC
While extracting the signal, the on-board signal is extracted by the band transducer BPF4, and the attenuator ATT connected in series with the band transducer BPF3 attenuates ATCQ'-Q with a V-bell switch that is approximately the same as the on-board signal. In addition, a dual-band transducer BPF3
, BPF4 side outputs are mixed by a mixer MIX and then given to the suppression receiver RXdl.

Therefore, instead of the reference 4gM (Sr) in Figure 3 VC, the onboard signal (Sv) and the ATC, which is approximately 4 levels.
At the same time, when the vehicle V enters the section, the onboard signal (S) is also given, so the superposition of both signals is detected in the same way as in FIG. 3, and the signal is restored.

In addition, the on-board signal receiver RXd2 is connected to the output side of the bandpass filter BPF4, and since only the on-board signal (SV) is given to the receiver RXd2, the on-board signal (SV) is detected. -INT works.

In other words, when a vehicle V enters the section and there is a vehicle V, the relay ING is restored and the relay INT is activated.By providing these detection receiving units RXd for each section, each section If a block logic unit LG is provided that performs vehicle detection for each section and responds to the operation and recovery status of relays ING and INT for each section of h1, then by the ATC signal from the ATC transmitter TXa controlled by 1, It is possible to put the section into which J$[V has entered into the existing section into a blockage state, and if the vehicle V escapes from the section, the blockage state can be immediately released.

However, once the section has been set to a block state, the block logic section LG
By configuring the band p in any section,
Even if vehicle B becomes unable to be detected due to a fault in PF4, when vehicle V enters the faulty section, the rear section adjacent to this will remain closed, preventing a rear-end collision from a following vehicle. can be stopped.

Note that the format of the ATC signal and the on-board signal can be arbitrarily selected depending on the conditions. The same effect can be obtained by using a high-frequency P-wave filter, a low-frequency filter, etc. as the band filters BPF3 and BPF4, 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 the short circuit of the vehicle 411, can be performed reliably with a simple and minimal configuration. Moreover, since it is carried out accurately, remarkable effects can be obtained in new transportation systems using rubber tires.

[Brief explanation of drawings]

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, and Fig. 3 d ° 2
FIG. 4 is a waveform diagram of a situation in which the suppression receiver 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. ■・・・Vehicle, TXv・・Vehicle transmitter, ANTl
, ANT3---Antenna, L 1111 e
*Section loop, RXdl...suppression receiver, RXd2
...Onboard signal receiver, TXa...ATC transmitter, BPF3, BPF4...band p-wave device, ATT
...Attenuator, MIX...Mixer, ING,
INT...Relay. Patent applicant: Kyosan Seisakusho Co., Ltd. Agent: Masaki Yamakawa (and one other person)

Claims (1)

[Claims] An on-board signal transmitting antenna that is individually provided to the front and rear parts of the vehicle and transmits mutually in-phase signals, an on-board transmitter that simultaneously supplies signals to each of the antennas, and each of the above-mentioned antennas. A section loop facing the vehicle's path for each section and over the entire section, an ATC transmitter that supplies a speed control signal for the vehicle to the loop, and extracting the speed control signal via the loop. First thing to do
a P-wave device, a second P-wave device that extracts the on-board signal received by the loop, an attenuator connected in an inner row with the first P-wave device, and a second P-wave device that extracts the on-board signal received by the loop; a mixer for mixing the output of the second Oki transducer side and the output of the second Oki transducer side; a suppression receiver connected to the output side of the mixer and provided for each section; A vehicle detection device comprising: an on-vehicle signal receiver connected to the output side of a door transducer and provided for each of the sections.