JP3438176B2 - Ground child - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to an automatic train stop device (A
TS), automatic train control device (ATC), automatic train operation device (ATO), or a grounding device used for in-vehicle alarm.

[0002]

2. Description of the Related Art An ATS is composed of a part on the ground (ground device) that indicates the condition of a ground signal, and a part on the vehicle (device on the vehicle) that picks up the ground condition and carries out the required operation. The ground element is a high-frequency changing type ground device. There are two types: a system for communicating information on the ground and on-vehicle by utilizing the changing frequency of the resonance frequency of the ground device and the on-board device, and a system for absorbing high frequencies. It is used.

FIG. 2 shows a basic circuit configuration of the ATS ground element. In the figure, a ground element E is a resonance circuit including a tuning coil L and two capacitors C1 and C2, and is provided with a switch S that switches between the capacitors C1 and C2. When the switch S is closed (ON), the parallel circuit of the tuning coil L1 and both capacitors C2 causes 103
A resonance circuit that resonates at KHz is formed. 103 KHz
Even when the train child T of a normal train passes over the ground child E on which the resonance circuit is formed, the on-board device does not perform any operation,
When the switch S is open (OFF), the ground coil E includes a resonance circuit that resonates at 123 KHz by the tuning coil L and the capacitor C1. Electromagnetically coupled with the coil of the vehicle, the oscillation frequency of the on-board device is 123 KHz due to the Ziehen phenomenon.
The frequency is changed to 130 KHz, a relay (not shown) is activated, and the brake is automatically applied to stop the train. Incidentally, 103 KHz is a resonance frequency for operating the on-board device of the inspection vehicle.

[0004]

Conventionally, in order to monitor whether or not the Q value of the resonance circuit is lowered, the inspection vehicle must be run on each ground element, and the Q value in a plurality of ground elements is required. We were unable to monitor the decline centrally.

It is an object of the present invention to provide a grounding element adapted for centralized surveillance.

[0006]

In order to achieve the above object, a grounding element according to the present invention is a grounding element having a resonance circuit and a failure detection circuit, the resonance circuit including a tuning coil and a capacitor. And causes a resonance phenomenon,
The failure detection circuit is inductively coupled to the tuning coil of the resonance circuit, constantly performs feedback oscillation at a frequency tuned to the resonance frequency of the resonance circuit based on a signal input through the tuning coil, and determines the Q value of the resonance circuit. It monitors and detects the failure of the resonant circuit.

Further, the failure detection circuit has a feedback oscillation section which is inductively coupled to the tuning coil of the resonance circuit.

Further, the feedback oscillating section is composed of a combination of a transistor and an LC resonance circuit.

Further, the failure detection circuit has a function of setting the limit value of the Q value of the resonance circuit to be inspected by adjusting the amount of feedback from the resonance circuit.

Further, the failure detection circuit adjusts the amount of feedback from the resonance circuit with a resistor.

[0011]

In the present invention, a failure detection circuit for performing feedback oscillation using a resonance circuit of a ground element is added, and the failure detection circuit is constantly fed back and oscillated at a frequency tuned to the resonance frequency of the resonance circuit. A failure of the resonant circuit is detected by monitoring the Q value of the resonant circuit.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an ATS ground element will be described below with reference to the drawings. In FIG. 1, a ground element E according to the present invention includes a resonance circuit 1, a semiconductor switch element 2, a control input circuit 3, and a failure detection circuit 4.

The resonance circuit 1 is a circuit formed by a combination of a tuning coil L3 and a capacitor C1 or a capacitor C2. The combination of the tuning coil L3 and the capacitor C1 is a circuit that generates a resonance frequency of 123 KHz that gives an operation command to the onboard device. When the capacitor C2 is connected to the tuning coil L3, the onboard device for a normal train is A resonance circuit having a resonance frequency of 103 KHz which does not react is constructed. As described above, the resonance frequency of 103 KHz is a frequency for operating the on-board device of the inspection vehicle.

The semiconductor switch element 2 is, for example, a photo switch.
It is a MOST, is incorporated between the tuning coil L3 of the resonance circuit 1 and the capacitor C2, receives the signal of the control input circuit 3, and switches the combination of the tuning coil L3 and the capacitor C1 or C2 to resonate the resonance circuit 1. The frequency is switched. In the embodiment, two photo-MOSTs 2a and 2b are used as the semiconductor switch element 2,
Even when a short circuit occurs in the failure mode, consideration is given so that the indicated stop value is obtained.

The control input circuit 3 is a circuit for inputting a control command signal for switching the resonance frequency of the resonance circuit 1 to the semiconductor switch element 2. The control command signal is input in conjunction with the operation of the traffic signal on the premises.

The failure detection circuit 4 is inductively coupled to the tuning coil L3 of the resonance circuit 1 and constantly performs feedback oscillation at a frequency tuned to the resonance frequency of the resonance circuit 1 to monitor the Q (selectivity) value of the resonance circuit 1. Then, the failure of the resonance circuit 1 is detected.

The failure detection circuit 4 shown in FIG.
A pair of failure detection coils L1 and L2, which are inductively coupled to the tuning coil L3, and power are constantly supplied from the failure detection power supply 5, and are fed back through the failure detection coil L1 to the resonance frequency of the resonance circuit 1. It has a feedback oscillator 6 that performs feedback oscillation at a tuned frequency, and a monitor 7 that monitors the oscillation of the feedback oscillator 6 and detects a failure of the resonant circuit 1.

The feedback oscillator 6 according to the embodiment shown in FIG.
It has the following structure. The transistor 6g driven by the power supply from the failure detection power supply 5 is a resistor 6f and a capacitor 6c which form a time constant circuit having a self-adjusting function.
Is provided on the emitter side, and the resonance circuit including the capacitor 6a and the failure detection coil L2 is provided on the base side.
The failure detection coil L2 is connected via b, and is inductively coupled to the tuning coil L3 of the resonance circuit 1. 6d, 6e
Is a resistor for voltage division. A collector-tuned resonance circuit including a secondary coil 6j of a transformer 6h and a capacitor 6i is connected to the collector side of the transistor 6g. Further, the failure detection coil L1 that is inductively coupled to the tuning coil L3 of the resonance circuit 1 is connected to the primary side coil 6k of the transformer 6h, and the resonance circuit of the resonance circuit 1 to the coil 6j and the capacitor 6i is formed by the coil L1 and the coil 6k. Constitutes a feedback circuit to.

Further, the failure detection circuit 4 according to the present invention is
The feedback circuit including the coil L1 and the coil 6k includes the variable resistor 8, and the variable resistor 8 adjusts the feedback amount from the resonance circuit 1 to adjust the Q value of the resonance circuit 1 to be inspected. It has the function of setting the limit value.

The monitoring unit 7 according to the embodiment shown in FIG.
Rectifier circuit 7 connected to the primary coil 6l of the transformer 6h
a is connected to the output side of the rectifier circuit 7a,
And a relay 7b that outputs a failure detection output.

In the embodiment, when a control command signal is input between the terminals of the control input circuit 3, for example, a signal in the case where the traffic signal is advanced, the semiconductor switch element 2 becomes conductive,
The resonance circuit 1 constitutes a resonance circuit having a frequency of 103 KHz by a combination of the tuning coil L3 and the capacitor C2, and allows a normal train to pass through the ground element E as it is.

When the input of the control command signal is cut off, for example, when the display of the traffic signal is switched to stop, the semiconductor switch element 2 becomes non-conductive, and the resonance circuit 1 becomes the tuning coil L3.
And a capacitor C1 are combined, the circuit is switched to a circuit having a resonance frequency of 123 KHz, a train command of a normal train passing over the ground element E is operated, and a braking command is issued.
Stop the train.

On the other hand, in the failure detection circuit 4, the failure detection coils L1 and L2 are inductively coupled to the tuning coil L3 of the resonance circuit 1, and when the transistor 6g is oscillated to cause a current to flow in the failure detection coil L1, the mutual detection is performed. A voltage is generated in the tuning coil L3 of the resonance circuit 1 that is inductively coupled, a resonance phenomenon occurs in the resonance circuit 1, and when the semiconductor switch element 2 is in the conductive state,
The semiconductor switch element 2 resonates at a resonance frequency of 03 KHz, and resonates at a resonance frequency of 123 KHz in the non-conducting state of the semiconductor switch element 2.

A part of the output of the resonance circuit 1 is a coil L.
1 and the coil 6k through the coil 6j and the capacitor 6
The resonance circuit of the coil 6j and the capacitor 6i receives the feedback from the resonance circuit 1, and the resonance frequency of the resonance circuit 1 (for example, 103 KHz, 1
23 KHz) and the feedback oscillation is always performed at the frequency tuned.

When the failure detection circuit 4 tunes to the resonance frequency of the resonance circuit 1 and normally performs feedback oscillation, since the relay 7b is excited, its uplifting contact 7c does not fall and resonance occurs. The failure detection signal of the circuit 1 is not output.

By the way, the Q value is lowered by deterioration of the capacitor C1 or C2 forming a pair with the tuning coil L3, or rainwater infiltrated from a crack or the like of the epoxy resin coating the tuning coil L3, capacitors C1, C2.

In this case, the failure detection circuit 4 is the resonance circuit 1
Since the feedback oscillation is performed at the frequency tuned with the resonance frequency of the resonance circuit 1 when the Q value of the resonance circuit 1 is reduced, the current flowing through the resonance circuit of the coil 6j and the capacitor 6i in the failure detection circuit 4 is reduced. Since the number of relays 7b decreases, the relay 7b is no longer excited, the up-contact 7c drops, and an abnormal signal that the Q value of the resonance circuit 1 has decreased is issued as a failure detection output.

The amount of feedback from the resonance circuit 1 to the failure detection circuit 4 is adjusted by the variable resistor 8, and for example, the resonance circuit 1
When the normal Q value set for is set to 70, the resonance circuit 1
The limit value of the maintenance standard is set to 60, and when the value exceeds the limit value, the failure detection circuit 4 immediately detects a decrease in the Q value of the resonance circuit 1. Therefore, it is possible to set the fluctuation range of the decrease in the Q value of the resonance circuit 1 within a minute range, and it is possible to suppress the decrease in the Q value of the resonance circuit 1 within the minute range.

In the above embodiments, the present invention is applied to the ATS (automatic train stop device) ground wire, but the same applies to the ground wire of the in-vehicle alarm device, the automatic train control device, and the automatic train operation device. Applicable to

[0030]

As described above, according to the present invention, a failure detection circuit for performing feedback oscillation utilizing a resonance circuit in a ground element is added, and the failure detection circuit is tuned at a frequency tuned to the resonance frequency of the resonance circuit. Since the Q value of the resonant circuit is constantly monitored by feedback oscillation, it is possible to constantly monitor the failure of the resonant circuit without actually running the inspection vehicle, and it is possible to centrally monitor a plurality of ground elements. .

Further, in the failure detection circuit according to the present invention, the limit value of the Q value of the resonance circuit to be inspected is set, and an abnormal signal is output when the Q value drops below the limit value. It is possible to detect a decrease in the Q value of the resonance circuit within a minute range, and it is possible to operate the train more safely.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of the present invention.

FIG. 2 is an electric circuit diagram showing a conventional grounding element.

[Explanation of symbols]

1 resonant circuit 2 Semiconductor switch element 3 control input circuit 4 Failure detection circuit 6 Feedback oscillator 7 Monitor 8 variable resistors L1, L2 Failure detection coil L3 tuning coil C1, C2 capacitors

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiko Yoshizawa 4-10-1 Haneda, Ota-ku, Tokyo (72) Inventor Katsuhiko Nakamura 3-11-6 Ise, Kofu City, Yamanashi Prefecture (56) Reference JP-A-7 -297767 (JP, A) JP-A-6-340259 (JP, A) Actually open 50-127804 (JP, U) Actually open 6-55928 (JP, U) JP 60-6582 (JP, B2) ) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B61L 3/12 H04B 1/59

Claims (5)

(57) [Claims] 1. A ground element having a resonance circuit and a failure detection circuit, wherein the resonance circuit is composed of a tuning coil and a capacitor and causes a resonance phenomenon. It is inductively coupled with a tuning coil, and always performs feedback oscillation at a frequency tuned to the resonance frequency of the resonance circuit based on a signal input through the tuning coil, and monitors the Q value of the resonance circuit to detect a failure of the resonance circuit. A ground child characterized by being detected. 2. The ground element according to claim 1, wherein the failure detection circuit has a feedback oscillator that is inductively coupled to the tuning coil of the resonance circuit. 3. The feedback oscillator comprises a transistor and an LC.
The ground element according to claim 2, wherein the ground element comprises a combination with a resonance circuit. 4. The failure detection circuit has a function of setting a limit value of a Q value of the resonance circuit to be inspected by adjusting a feedback amount from the resonance circuit. The ground element according to claim 1. 5. The ground element according to claim 4, wherein the failure detection circuit adjusts a feedback amount from the resonance circuit with a resistor.