JP2001171520A - Short detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a short by a software, without requiring a direct-current power supply circuit and the like for detecting the short. SOLUTION: This short detector detects the short in a transmitting/receiving means for receiving a specified transmitting signal sent from a transmitting means by a receiving means to carry out a specified processing. In the short detector is composed of a detecting means for detecting the short at a receiving level in the receiving means is not less than a predetermined value, a calculating means for calculating the change of rising in the receiving level per specified unit time in the receiving means, and a detecting means for detecting the short when the calculated change of rising of the receiving level shows a short state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch detection device used for a train position detection device, a train control device, and the like. In particular, the present invention relates to a touch detection device which can be easily used without requiring a circuit for applying a touch detection DC voltage. The present invention relates to a device capable of detecting a touch.

[0002]

2. Description of the Related Art Conventionally, this type of train position detecting device is disclosed in Japanese Unexamined Patent Publication No. 54-26618, for example, as a target device for performing touch detection, for example, a train detecting device (hereinafter referred to as a "TD device"). ) Is applied between the transmission and reception cables, and a change in the DC current when a touch occurs is detected by a touch detection relay to detect the touch.

[0003]

However, the above-described conventional touch detection device has a drawback that the DC power supply circuit for touch detection and a touch detection relay are required, thereby increasing the equipment cost. For this reason, the appearance of a touch detection device capable of easily and reliably detecting touch is desired.

Accordingly, the present invention has been made to meet the above-mentioned demand, and it is an object of the present invention to simply and reliably detect a touch without requiring a DC power supply circuit for detecting a touch. It is an object of the present invention to provide a touch detection device that can be used.

[0005]

In order to achieve the above object, a touch detection device according to the present invention has a transmission / reception means for receiving a predetermined transmission signal transmitted from a transmission means by a reception means and performing predetermined processing. In the touch detection device for detecting a touch, a touch detection unit that detects a reception level of the reception unit, and a detection unit that detects a touch when the detected reception level is equal to or higher than a predetermined value, is provided. .

In order to achieve the above object, a touch detection device according to the present invention detects a touch in a transmitting / receiving means for receiving a predetermined transmission signal transmitted from a transmitting means by a receiving means and performing a predetermined process. In the detection device, a calculation unit that calculates a change in reception level per unit time in the reception unit, and a detection unit that detects a touch when the calculated change in the reception level indicates a touch state, It is characterized by having.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram when the touch detection device according to one embodiment is applied to a TD device.

First, the TD device shown in FIG. 1 will be briefly described. This TD device is provided at a starting end of a track circuit T formed by dividing a rail on which a train A travels into a predetermined length. A transmission signal having a predetermined frequency generated by the transmitter 1 is transmitted to a transmission cable C1 and a matching device (connection transformer).
configured to be applied through t1 and
A receiver 2 is connected to the terminal side of the track circuit T via a matching device t2 and a receiving cable C2 so that a transmission signal transmitted from the transmitter 1 can be received.

In the TD device having the above configuration, the track circuit T
When the train A is not on the train (the state shown in FIG. 1), the transmission signal transmitted from the transmitter 1 is received by the receiver 2, so that the track relay TR lifts (ON) and the train None is detected. When the train A enters the track circuit T, the transmission signal sent from the transmitter 1 is short-circuited by the axle, the reception signal in the receiver 2 disappears, the track relay TR falls (OFF), and the train Existence is detected.

In FIG. 1, a is a block diagram showing a schematic configuration of a touch detection device, wherein an amplifying circuit 3 for amplifying a received signal received by a receiver 2 and a digital signal An analog-to-digital (A / D) conversion circuit 4 for converting the digital signal into a digital signal and a CPU 5 for analyzing the converted digital signal to detect a touch.

Next, before describing a touch detection control operation in the touch detection device a, the principle of touch detection will be described with reference to FIG.

FIG. 2 (a) shows the weather (weather) in a normal state in which the two cables C1 and C2 are not in contact with each other.
3 shows a change in the reception level of the reception signal received by the receiver 2 with respect to the change of the reception level.

As apparent from FIG. 2 (a), during rainfall, the reception level is lower than that in fine weather due to impedance bonds and rails (not shown) or attenuation of matching devices t1, t2 and rails. 1-6dB
However, the change from the decrease to the fine weather, that is, the time when the reception level rises to the original state after the rain stops is a long time of 10 to 20 hours, and the rise speed is extremely slow. Presents an ascending change.

FIG. 2B shows an increase in the reception level of the reception signal received by the receiver 2 when a touch occurs between the two cables C1 and C2 as indicated by a chain line in FIG. I have.

The increase in the reception level when this touch occurs is much shorter (t) in units of seconds than the change in time in accordance with the weather as shown in FIG. 2B. A change will appear in a while. Therefore, it is possible to determine whether the reception level has increased due to a change in weather or the reception level has increased due to a touch, based on how much the increase in the reception level has changed per unit time. If the predetermined value has been reached, as shown on the right side of FIG. 2B, it can be determined that a touch has occurred.

Hereinafter, the touch detection control operation will be described with reference to the flowchart of FIG. The orbit relay TR is now ON
It is assumed that the transmission signal from the transmitter 1 has been received by the receiver 2 (Yes at Step 100; hereinafter, the step is referred to as “S”).

The sampling of the CPU 5 causes the CPU 5
The received level (V1) is stored in a memory (not shown) (S102). When the received reception level (V1) is equal to or higher than a predetermined value, that is, a predetermined value when the reception level (V1) causes a touch (FIG. 2B).
(See the reception level on the right side of the above), the touch is detected (Yes at S104, S114). When the reception level (V1) is equal to or less than the above-mentioned predetermined value, a predetermined time (T) elapses after the sampling (for example, after a lapse of time such as 30 seconds in which a change in the reception level due to touching can be detected). The reception level (V2) at that time is stored again (Yes at S106, S108).

The CPU 5 calculates a change ((V2−V1) / T) in the reception level during the above-mentioned predetermined time (T) (S110), and when the change is less than the above-mentioned change in the touch. The detection of the increase in the reception level described above is repeated again (No at S112). In addition,
The above-described sampling of the reception level may be performed continuously, for example, every one second, and may be calculated almost continuously using a value sampled a predetermined time before this sampling, for example, 30 seconds before.

In the above-described calculation of the increase in the reception level (S110), when the change per predetermined unit time exceeds a predetermined value (for example, 1 dB or more in 30 seconds), a touch occurs. Is output to the management center (not shown) of the TD device (Yes at S112, S1
14).

As described above, the touch detection device according to the present embodiment increases the reception level of the reception signal received by the receiver 2 without using a conventional DC power supply circuit for touch detection. It is possible to easily detect a touch by simply detecting a change.

In the above example, the received signal is a TD signal. However, when a train control signal (ATC signal) is transmitted to the train A via the track circuit T, the reception level of the ATC signal increases. It is also possible to detect a touch by detecting a change.

[0022]

The touch detection device according to the present invention comprises detection means for detecting a reception level of the reception means and detection means for detecting a touch when the detected reception level is equal to or higher than a predetermined value. Without using a direct-current power supply circuit or the like for touch detection as described above, touch detection can be easily detected only by detecting an increase in the reception level of the reception signal.

The contact detection device according to the present invention comprises a calculating means for calculating a change in the reception level of the receiving means per predetermined unit time, and a touch when the calculated change in the reception level indicates a touch state. Therefore, it is possible to easily detect a touch by simply detecting an increase in the reception level of the received signal without using a conventional DC power supply circuit for the touch detection.

[Brief description of the drawings]

FIG. 1 shows a touch detection device according to an embodiment of the present invention as T
It is a schematic block diagram when applied to D apparatus.

FIG. 2 is an explanatory diagram showing a change in a reception level for explaining the principle of touch detection according to the present invention.

FIG. 3 is a flowchart illustrating a control operation of touch detection.

[Explanation of symbols]

 T track circuit a train 1 transmitter (transmitting means) 2 receiver (receiving means) C1, C2 cable t1, t2 matching device a touch detection device 3 amplification circuit 4 A / D conversion circuit 5 CPU (calculation means, detection means)

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hidetaka Saegusa 1-13-8 Kamikizaki, Urawa-shi, Saitama Japan Signaling Co., Ltd. Yono Works F-term (reference) 2G014 AA06 AB23 AB28 AB34 AC07 5H161 AA01 BB03 CC13 DD02 FF02 FF07 5K046 AA03 BA01 CC09 DD11 PP01 PS06 YY01

Claims (2)

[Claims] 1. A touch detection device for detecting a touch in a transmission / reception unit that receives a predetermined transmission signal transmitted from a transmission unit by a reception unit and performs a predetermined process, wherein the detection unit detects a reception level in the reception unit. And a detecting means for detecting a touch when the detected reception level is equal to or higher than a predetermined value. 2. A touch detection device for detecting a touch in a transmission / reception unit that receives a predetermined transmission signal transmitted from a transmission unit by a reception unit and performs predetermined processing, wherein a predetermined unit time of a reception level in the reception unit is provided. A touch detection device comprising: a calculation means for calculating a change in hitting; and a detection means for detecting a touch when the calculated change in the reception level indicates a touch state.