JPH101052A - Train passing warning system - Google Patents

Abstract

(57) [Summary] [Problem] A fail-safe train passage alarm system that automatically detects a train from a track maintenance work site at a remote location without relying on manual labor and provides approaching passage information to the track maintenance work site quickly and reliably. provide. Kind Code: A1 A wheel detection unit provided alongside rails on which a train travels, a train passage detection unit detecting passage of the train by an output signal of the wheel detection unit, and a train passage detection unit. It comprises an alarm generator 6 that issues an alarm with an output signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a train passing warning system.

[0002]

2. Description of the Related Art Railway tracks, overhead lines, and other maintenance work for train operation are extremely important operations that are indispensable for safely operating a train. Conventionally, these track maintenance work has been concentrated in the nighttime off hours when the number of trains is small so as not to disturb the regular operation of commuter trains or passenger trains.

However, in recent years, with the increase in transportation of passengers and goods, long-distance passenger trains and long-sized freight trains have been operated even at night, and safe maintenance work has been desired.

[0004] For this reason, at the time of track maintenance work, a guard is arranged at a position along the track distant from the track maintenance work site, and the observer exchanges information with the central command room and checks the train schedule while approaching the train. After visual confirmation, the work site is reported to the work site using radio or the like, and the work site supervisor who receives the report evacuates the workers to a safe place to ensure the safety of the track maintenance work.

[0005]

As described above, the safety of the track maintenance work site is left to the observer, but the visibility is deteriorated due to weather conditions, the visibility is poor at the curved part, and the visibility distance at night becomes short. , If the conditions such as poor health of the observer overlap, there is a possibility that the report will be delayed or the approaching train will be overlooked, and the method of monitoring the train with visual field is an extremely severe task for the observer .

On the other hand, at the track maintenance work site, since the work must be performed quickly and accurately, the workers concentrate on the work, and it is difficult to recognize the approach of the train individually. In some cases, the on-site supervisor's perception of approaching the train may be delayed due to noise at the site.

[0007] Although the on-site supervisor is sufficiently careful about the safety of the track maintenance work, it is the present situation that the above conditions are duplicated and a serious accident has occurred.

[0008]

A wheel detecting means for detecting a train wheel, a train passing detecting means for detecting a train passing by an output signal of a secondary winding of a magnetic circuit constituting the wheel detecting means, An alarm generating means for generating an alarm based on an output signal of the train passing detecting means, and means for automatically detecting a failure of each of the wheel detecting means, the train passing detecting means and the alarm generating means.

The phase of the phase detector of the train passage detecting means is controlled by the induced voltage of the secondary winding of the magnetic circuit of the wheel detecting means constituted by the E-shaped iron core laid along the track and the train wheels.

When the magnetic circuit is not formed, since the induced voltage value of the secondary winding is low, the phase output pulse width of the phase shifter becomes narrow, and the polarity inversion signal of the phase output of the phase shifter and the polarity inversion signal The output signal of the alternation generating section alternates at a constant cycle in accordance with the AND condition satisfaction signal with the signal synchronized with the power supply.

When the magnetic circuit is constructed, the induced voltage value of the secondary winding becomes high, so that the phase output pulse width of the phase shifter becomes wide, and the polarity inversion signal of the phase output of the phase shifter and the polarity inversion signal The logical product condition with the signal synchronized with the power supply is not satisfied, and the alternation of the output signal of the alternation generating unit stops.

After the output signal of the alternation generator is input to the microcomputer and the output cycle is measured, the alternation signal is input to the alarm generator. In the alarm generator, no alarm is issued if the input signal alternates at a fixed cycle.
When the alternation stop is detected, an alarm is issued. Further, the microcomputer recognizes the number of wheels of the train from the alternation stop and start time of the output signal of the alternation generating unit, and further calculates and displays the train length and the train passing speed.

If any of the wheel detector, the train passage detector, and the alarm generator breaks down, the alternation of the alternation generator stops, and the alarm generator issues an alarm.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below.
FIG. 1 is a diagram showing a fail-safe train passing warning system according to one embodiment of the present invention. In FIG. 1, 1 and 2 are rails, 3 is a train (the right direction in the drawing is the traveling direction), 4 is a wheel detector, 5
Is a train passage detection unit, 6 is an alarm generation unit, and a dotted line part is a maintenance work section.

FIG. 2 is an explanatory view from above of the wheel detecting section. In FIG. 2, 31 is a train wheel, 41 is an E-shaped iron core, 42
Is a primary winding, 43 is a secondary winding, and 44 and 45 are primary windings 4.
2 are power supply terminals, and 46 and 47 are output terminals of the secondary winding.

FIG. 3 is a block diagram of the train passage detecting section 5. 5, reference numeral 51 denotes a power source, 52 denotes a phase shifter, 53 denotes a logical product circuit, 54 denotes a flip-flop, 55 denotes a flip-flop, 56 denotes a microcomputer, 511 and 512 a power supply terminal, 513 denotes a reference signal, and 514 denotes a phase shifter 52. 521 and 522 are input terminals, and 523 is a phase shifter 52.
Is the output signal of the AND circuit 53,
541 is an output signal of the flip-flop 54, 561 is an output terminal, the input terminal D1 of the flip-flop 54 is connected to the output terminal Q2 of the flip-flop 55, and the input terminal D2 of the flip-flop 55 is Terminal Q1 is connected.

FIG. 4 is a circuit diagram of the alarm generator 6. FIG.
61 is a current limiting resistor, 62 is a transistor, 63 is a pulse transformer, 64 is a current limiting resistor, 651 and 65
2 is a diode, 66 is a relay, 67 is a contact of the relay 66, 68 is an alarm generator, 691 is an amplifier circuit, 692 is an input terminal, 693 is a power supply terminal 1, and 694 is a power supply terminal 2. Note that the dotted arrow in FIG. 4 indicates the operation direction of the contact when the relay 66 operates, and the solid arrow indicates voice.

FIG. 5 is a timing chart of a train passage detecting operation when a train is not passing, and FIG. 6 is a time chart of a train passage detecting operation when a train is passing. Output voltage, (2) a reference signal synchronized with the power supply voltage 51, (3) a secondary output voltage of the wheel detector 4, (4) a phase output voltage of the phase shifter 52, (5)
Is the output signal 531 of the AND circuit 53, (6) is the Q1 output signal of the flip-flop 54, and (7) is the Q2 output signal of the flip-flop 55. The operation of detecting the passage of a train and issuing an alarm will be described with reference to FIGS.

The wheel detection circuit 4 is arranged along the track at a long distance from the maintenance work site so as to be parallel to the train wheels. The power supply terminals 44 and 45 are connected to the power supply terminal 51 of the train passage detection unit 5.
1 and 512 are connected to supply power, and output terminals 46 and 4 are connected.
7 is connected to the input terminals 521 and 522 of the train passage detection unit 5.

In the initial state, the train passage detection circuit 5
It is assumed that the output terminal Q1 of the flip-flop 54 is at logic level "0" and the Q2 terminal of the flip-flop 55 is at logic level "1".
Operate in synchronization with the rise of each clock signal.

In the state where the train does not pass, that is, when the magnetic circuit is not formed by the E-shaped iron core and the wheels, most of the magnetic flux of the iron core of the wheel detection circuit 4 becomes leakage magnetic flux, and is slightly different from the secondary winding. Since the magnetic fluxes only intersect, the secondary output voltage value becomes low as shown in (3) of FIG. For this reason, the pulse width of the phase output of the phase shifter 52 of the train passage detection unit 5 becomes narrow, and the phase output signal 523 whose polarity is inverted becomes as shown in (4) of FIG.

The phase output signal 523 of the phase shifter 52 is supplied as a power source and an input signal of the AND circuit 53, and further supplied to the flip-flop 55 as a clock signal.

Therefore, the output signal 531 of the AND circuit 53
The pulse width becomes a pulse width equal to the reference signal 513 as in (5) in FIG. 5, since the input to the clock terminal CK1 of the flip-flop 54 at time t ₀₁ Q1 output terminal of flip-flop 54 is in Fig 5 The logic level becomes "1" as shown in (6), and the flip-flop 55
D2 input terminal attains a logic level "1".

Clock terminal CK of flip-flop 55
Since the phase output signal 523 of the phase shifter 52 is input to 2, the Q2 output terminal of the flip-flop 55 becomes the logic level “0” at time t ₁ as shown in (7) of FIG.

Then, at time t ₀₂ , the flip-flop 54
Q2 of the flip-flop 55 the logic level "0", at time t ₂ as Q1 output terminal of FIG. 5 (6)
The output terminal is at the logical level "1" as shown in (7) of FIG. Thereafter, the same operation is repeated.
4 and the output signal of the flip-flop 55 alternate at a constant cycle.

Then, the output signal 541 of the flip-flop 54 is input to the microcomputer 56, and its alternation cycle is measured. If the alternation cycle is within a predetermined range, the microcomputer 56 outputs an alternation signal having a constant cycle.

When the output signal of the microcomputer 56 is input to the amplifier circuit 691 through the input terminal 692 of the alarm generator of FIG. 4, the transistor 62 repeats the conduction and cutoff operations. A voltage is induced on the next side.

The secondary induced voltages are diodes 651 and 652
And is applied to the relay 66.

In general, a relay has a fail-safe characteristic having an asymmetrical failure characteristic in which the ratio of a failure in which a contact is welded due to an overcurrent or the like and a failure in which a contact is opened due to disconnection of a winding is 1000: 1. A circuit for generating an alarm using the contact 67 that closes when the relay 66 is released is configured.

When the train is not passing, the relay 67 of the alarm generator 6 is excited by the alternation signal of the train passage detector 5, so that the contact 67 is opened and no alarm is issued.

When the train passes, the E-type magnetic circuit of the wheel detection circuit 4 is constituted by the wheels of the train, and the magnetic flux of the iron core passes through the wheels and the E-type iron core. (3), the pulse width of the phase output of the phase shifter 52 becomes wider, and the phase output signal 523 whose polarity is inverted gradually becomes narrower as shown in (4) of FIG. Becomes

As described above, the phase output signal 52 of the phase shifter 52
3 is supplied as the power supply of the AND circuit 53, the power is not supplied when the phase output signal 523 of the phase shifter 52 becomes narrower, and the output signal 53 of the AND circuit 53 is not supplied.
1 is not output at time t ₀₆ as shown in (5) of FIG.
For this reason, the Q1 output terminal of the flip-flop 54 is
As shown in (6), the logic level becomes "1", the flip-flop 55 becomes the logic level "0", and the alternation of the output signal stops.

When the microcomputer 56 recognizes this alternation stop, the alternation of the output signal is also stopped.

Therefore, when the train passes and a magnetic circuit is formed, the alternation of the output of the train passage detecting unit 5 stops, the relay 66 is released, and the contact 67 is closed, so that the voltage is supplied from the power supply terminal 694. And an alarm will be issued.

By the way, since each train has eight wheels and two bogies, assuming eight trains per train, a magnetic circuit is formed 32 times by one wheel, and the output signal of the train passage detection circuit is alternately output. When the microcomputer 56 detects the alternation stop, it is programmed in advance to hold the alternation stop state for an arbitrary time when the microcomputer 56 detects the alternation stop. By doing so, it is possible to configure so that an alarm is issued when one train passes.

Further, by measuring the repetition period of alternation and alternation stop by the microcomputer 56, it is possible to measure the speed of the train passing through the position of the wheel detection unit 4 and the arrival time from the installed position to the track maintenance work site, Since the time can be displayed (not shown), the track maintenance work can be performed more safely.

As described above, the power supply 5 of the train passage detection unit 5
1, phase shifter 52, AND circuit 53, flip-flop 5
4 and 55, the microcomputer 56 and the primary winding 42 and the secondary winding 43 of the wheel detection circuit section 4 are normal, the flip-flop 54 is in a state where the magnetic circuit is not formed.
And the output signal of the microcomputer 55 alternates at a constant cycle, and the output signal of the microcomputer 56 alternates at a constant cycle.

If any one of the wheel detection unit, the train passage detection unit, and the alarm generation unit breaks down, the passage of the train cannot be detected, and if no alarm is issued, a serious accident is expected.

Therefore, the present invention has a function of detecting a failure by itself and generating an alarm when the wheel detector, the train passage detector, and the alarm generator fail.

For example, a case where the primary winding 42 of the wheel detector 4 has a disconnection failure will be described as an example. When the primary winding 42 is disconnected, power is not supplied, so that no voltage is induced in the secondary winding 43. Therefore, (3) of FIG. 5 or FIG.
Is not obtained, and the phase shifter 52 of the train passage detecting unit 5
Is fixed to the logical level "1", and the AND circuit 53 is supplied with the power and the input signal of the logical level "1". Accordingly, the logical condition is satisfied, and the phase output signal 523 is continuously supplied to the clock terminal CK2 of the flip-flop 55. However, since the clock terminal CK1 of the flip-flop 54 is fixed at the logical level “1”, The alternation operation of the flip-flops 54 and 55 is stopped, the alternation of the output signal 541 is stopped, the alternation of the output signal of the microcomputer 56 is stopped, and the alternation signal is not input to the alarm generation unit 4, as in the normal case. The operation described above constitutes an alarm generation circuit, and an alarm is generated.

When the secondary winding 43 of the wheel detector 4 has a disconnection fault, the induced voltage value of the secondary winding 43 becomes zero. Is generated.

When the power supply 51 of the train passage detecting section 5 fails, no power is supplied to the primary winding 42 of the wheel detecting section 4, so that no voltage is induced in the secondary winding 43. Also, the reference signal 513 is not output and the power is not supplied to the phase shifter 52 either.
The alternation operation of 4 and 55 stops, and the microcomputer 5
The alternation of the output signals of 6 stops, and an alarm is issued.

When the microcomputer 56 breaks down, the operation is as follows. When the microcomputer 56 fails, its output is normally either a logic level fixed at "0" or "1" or it oscillates at a high frequency close to the clock frequency of the oscillator that determines the operation of the microcomputer 56. Therefore, it can be considered that the alarm does not occur at the low frequency at which the alarm generation circuit 6 operates. Accordingly, since the same state as the stop of the alternation of the input signal of the alarm generation circuit 6 is obtained, an alarm is issued.

As described above, according to the present invention, in addition to the function of detecting the passing train, if any one of the circuits of the wheel detecting unit 4 and the train passing detecting unit 5 fails, the alternation of the microcomputer 56 of the train passing detecting unit 5 is performed. When the operation is stopped, an alarm is generated, and the relay 66 is released even when the amplifier circuit of the alarm generating unit 6 breaks down.

As described above, according to the present embodiment, it is possible to reduce the burden on the observer such as exchanging information between the central command room and the track maintenance work site and wirelessly communicating with the track maintenance work site, and preventing erroneous recognition and misunderstanding. The effect to play is great.

Further, the embodiment of the present invention has a feature that since the rail and the train passage detecting section can be completely insulated, for example, the control information of the train flowing on the rail is not affected.

When detecting the approach of a train on an up line and a down line, it is necessary to insulate between the up line and the down line. However, in the embodiment of the present invention, there is no need to contact the detection unit with the rail, and the rail is connected to the rail. It only needs to be installed side by side and plays a significant role in improving work efficiency.

[0048]

According to the present invention, it is possible to realize a highly reliable train passing alarm system having a function of not only reliably detecting and alerting the passage of a train but also detecting its own failure and issuing an alarm. Therefore, the burden on the observer who monitors the approach of the train can be reduced, and the track maintenance work can be carried out safely.

[Brief description of the drawings]

FIG. 1 is an explanatory view of one embodiment of the present invention.

FIG. 2 is an explanatory diagram of a wheel detection unit.

FIG. 3 is a block diagram of a train passage detection unit.

FIG. 4 is an alarm generation circuit diagram.

FIG. 5 is an operation timing chart of a train passage detection unit.

FIG. 6 is an operation timing chart of a train passage detection unit.

[Explanation of symbols]

1, 2 ... rail, 3 ... train, 4 ... wheel detection means, 5 ... train approach detection means, 6 ... alarm generation means, 41 ... iron core, 4
4, 45: primary winding; 46, 47: secondary winding; 56: microcomputer.

Claims (4)

[Claims] 1. A wheel detecting means for detecting wheels of a train, a train approach detecting means for detecting approach of a train based on an output signal of the wheel detecting means, and an alarm for generating an alert based on an output signal of the train approach detecting means. A train approach warning system comprising generating means. 2. The vehicle according to claim 1, wherein said wheel detecting means is E
A train approach warning system comprising a type iron core and a primary winding and a secondary winding on the E type iron core. 3. The train approach warning system according to claim 1, further comprising means for detecting a failure of said wheel detecting means, said train approach detecting means, and said warning generating means. 4. The train approach warning system according to claim 1, wherein the train approach detection means includes a calculation means for predicting a passing speed of the train at the point where the wheel detection unit is installed and a time required to reach a work section.