JPS5810147Y2 - Signal detection device for mobile object stop control - Google Patents

Description

[Detailed explanation of the invention] When a moving object such as a train or new transportation system vehicle running on a fixed track is remotely controlled by a traffic management system,
It is absolutely necessary to detect the stopping position of a moving object or detecting the position where the brake is applied.

The present invention provides an economical and highly reliable signal detection device for automatic stop control of mobile objects by improving the conventional method of using guided radio lines for remote control signal transmission.

In the conventional method using a guided radio line, the antenna on the moving body side that connects to the parallel two-wire intersecting guide wire laid along the traveling path of the moving body is centered, for example, at the center between the two guiding wires, and A loop antenna installed so as to be parallel to the line plane, or a bar-shaped magnetic core antenna installed so as to be placed perpendicularly in the middle of two lines arranged in the horizontal plane of the guide wire is used.

At this time, when a signal current is passed through the induction wire and received by the above antenna, the reception level exhibits a fluctuation characteristic with respect to the position of the moving object, an example of which is shown in FIG. This method has the disadvantage of generating false drop points due to unnecessary connections near the line detection points.

As a countermeasure to this problem, methods are used such as screening on the receiving and detecting side or burying the guide wire at the detection point deep underground to avoid coupling with the antenna, but both methods are troublesome and expensive. there were.

The present invention was developed to eliminate such drawbacks, and will be explained in detail below using examples.

FIG. 1 is a diagram showing an example of the use of the device of the present invention.

In Fig. 1, 1 is a fixed transmitter, 2 is a two-wire induction wire through which high-frequency current from the transmitter 1 flows, and detection points 7, 8, 9, 10, 11, 12 in the section where the position is to be detected are used. In this method, two parallel wires are crossed, or the distance between two parallel wires is widened, and the other parts are twisted wires.

3 is the characteristic impedance (resistance) terminator for the inductive wire, and 1
-3 are the fixed side equipment of the present invention.

In addition, 4, 5, and 6 constitute the moving object side equipment of the present invention and are parts placed on the moving object. 4 and 5 are small rod-shaped magnetic core antennas, which are wound around a rod-shaped magnetic core such as ferrite in the same winding direction. The coils 4 and 5 are installed so that their axes are parallel to the plane containing the two wires of the two-wire induction wire and are located on or outside of each wire, and the outputs of coils 4 and 5 are mutually They are connected in series so that they have opposite phases, and their received combined output is sent to the receiver 6.

Further, the arrow 14 indicates the moving direction of the moving object, ie, the position detector consisting of 4.5.6.

The guide line shown in Figure 1 is an example of one installed near a train stopping station, and in this example, section 7-8 is a signal that starts to brake the train several hundred meters from the station. The detection section and section 9-12 is a section where a stop signal is given to the train.

The configuration (pattern) of these is determined by the stop control signal given to the train.

Now, when a current is passed through the guide wire 2 from the transmitter 1, a magnetic field is generated around the guide wire except for the section where the two wires are twisted together, such as between 89.

The dashed arrows shown in each part of the guide line 2 in FIG. 1 indicate the direction of the current at a certain moment.

Fig. 4 is an explanatory diagram of the magnetic flux distribution of the parallel two-wire guide wire and the coupling state between the moving object side antenna and the guide wire.As is well known, the two-wire guide wire has the highest magnetic flux density. Conventionally, a loop antenna 15 of a movable body or a thick rod-shaped magnetic core coil antenna 16 is provided at this position on the intermediate axis of the two wires, as shown in a and l), and coupled to the guide wire.

That is, in the past, either one of the loop antenna 15 or the rod-shaped magnetic core antenna 16 was arranged so that its surface was parallel to the guiding line plane and its center was aligned with the guiding line, and in the case of the latter, its axis was placed between the two guiding lines. The arrangement is made perpendicular to the plane to increase the effective bonding degree.

Now considering the case where a loop antenna is used, when the moving object is in section 2 in FIG. 1, the output voltage of the loop antenna is zero because the guiding wire 2 is a stranded wire.

Next, when the @ section is reached, the position is as shown in Figure 4C, and although there is no coupling between the guide wires 2a, 2b and the loop antenna 15,
An induced voltage is generated on the AC side by the magnetic flux penetrating the loop antenna from the bottom to the top due to the current flowing in one direction through the guide wires 13a and 13b.

The phase of this voltage is temporarily assumed to be positive as a reference.

Next, when there is a loop antenna in the ○ section, an induced voltage is generated by the magnetic flux penetrating the B and D sides from top to bottom due to the current in the induction wires 2a and 2b, as shown in FIG. 4d.

The phase of this voltage is opposite to the @ section.

By the way, the fact that both sections O and ■ are in opposite phase means that there is a point in between where the phase changes, and the output becomes zero at this point.

There are six points, and their positional relationship is shown in Figure 4e.

A voltage with a negative phase is induced in the loop antenna portion on the right side of the vertical portions 13a and 13b of the guide wire, and a voltage with a positive phase is induced in the loop antenna portion on the left side, and at the point where both induced voltages become equal. The combined output voltage of the loop antenna 15 becomes zero.

The same is true when using a rod-shaped magnetic core antenna, but Figure 5 shows these results together, and another detection point P' occurs before the detection point P where the reception level is above a certain level. I understand that.

FIG. 3 shows this situation for all the lines in FIG.

In order for a train to stop at a station, it is necessary to apply the brakes, but in order to perform the brake operation, for example, the speed of the moving object itself is compared with the on/off time of the detection signal, and the number of times the detection signal is turned on is memorized. It is clear that the level change characteristics as shown in FIG. 3 are undesirable.

Next, returning to the case of FIG. 1 of the present invention, the small bar-shaped magnetic core (coil) antennas 4 and 5 are placed parallel to the guiding wire plane, and their axes are perpendicular to the guiding wire, so that the magnetic field due to the guiding wire is A component perpendicular to the moving direction 14 of the moving body is received.

However, the antennas 4 and 5 of the mobile object are located at the position detection points 7, 8, and 9.
, 10, 11, 12, etc., the magnetic flux generated from the line 13 at the right angle to the guide wire is parallel to the parallel guide line,
A component perpendicular to the moving direction of the moving body does not occur.

Further, at an intersection such as 10.11, the currents flowing in the two wires at right angles are in opposite phases, so in any case, the reception level of the antennas 4 and 5 drops sharply from the reception level at the positions before and after the intersection.

Figure 2 shows the reception level characteristics with respect to the position of the moving object in this case. Although a normal drop in level occurs at the position detection point, no abnormality as shown in Figure 3 is observed in the vicinity. .

In addition, for external noise waves coming from a distance away from the guide wire, the noise voltages induced in the small rod-shaped magnetic core antennas 4 and 5 are in phase, so as mentioned above, the output of one antenna is in reverse phase with the output of the other antenna. Receiver 6 connected in series so that
The composite value of the noise at the input of -\ becomes zero and is not disturbed.

As described above, if the stop control signal detection device of the present invention is used, the control signal pattern predetermined by the guide wire can be received without causing abnormal changes in the detection signal level, and the control signal pattern of the moving object can be received. Control such as stopping can be performed reliably.

Another notable feature of this device is that it is a signal detection device that is resistant to external noise, and if put to practical use in applications such as automatic train stopping, it will be simple, economical, and capable of transmitting highly reliable information signals.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is an example of how the device of the present invention is used, and FIGS. 2 and 3 are characteristic diagrams of changes in the position of a moving object and reception level in FIG. The device according to the present invention is shown in FIG. 3, and the device shown in FIG. 3 is a conventional device. FIG. 4 is an explanatory diagram of the coupling between the magnetic flux distribution of the parallel two-wire guide wire and the guide wire of the mobile antenna, and FIG. 5 is a partially enlarged view of FIG. 3. 1... Fixed side transmitter, 2... Guide wire,
3...Terminal resistor, 4, 5...Small bar-shaped magnetic core antenna coil, 6...Mobile receiver, 7
~12...Position detector, 15...Loop antenna of conventional device, 16...Bar-shaped magnetic core antenna of conventional device.

Claims (1)

[Scope of utility model registration request] It is laid out along the path of the moving object, and the distance between the two parallel lines is determined in accordance with the pattern of stop control signals to be given to the moving object in each predetermined section, or the two parallel lines intersect. Ground fixed side equipment consisting of a two-wire guide wire and a transmitter that supplies high-frequency current from one end of the guide wire, and a ground-fixed equipment consisting of a two-wire guide wire and a transmitter that supplies a high-frequency current from one end thereof, and a ground-fixed equipment that is placed parallel to the plane containing the two wires of the guide wire and its center axis, and placed on each line of the guide wire. Mobile body side equipment consisting of a pair of rod-shaped magnetic core coil antennas arranged so as to intersect and couple at right angles and connected in series so that their outputs are in opposite phases, and a receiver that detects a control signal from the antenna outputs. A signal detection device for controlling a moving body stop, characterized by comprising: