KR20120009952A - Train position detection apparatus and its method by power line communication using trolley line - Google Patents

Abstract

PURPOSE: A train location detection apparatus for detecting the location of a train with power line communications using an electric car line and a method thereof are provided to detect the location of the train which is stopped in a serious fault condition, thereby rapidly handling malfunction of the train. CONSTITUTION: A ground control apparatus(10) controls train operation by detecting the location of a train. An electric power substation(40) is connected to the ground control apparatus through a common communication line. The electric power substation connects a power line communication line of an electric car line. An onboard control apparatus(20) is connected to the electric power substation. The onboard control apparatus controls train speed by detecting the train location. The ground control apparatus selects a communication line based on train location information. A PLC(Power Line Communication) line(L2) is connected to the electric power substation(30) in order to receive power.

Description

Train position detection apparatus and its method by power line communication using trolley line}

The present invention relates to a train position detection device and method for detecting a train position by power line communication, and more particularly, by using a power line communication technology (PLC), synchronization technology and impulse transmission, reception technology in normal operation or an abnormal accident The present invention relates to a train position detecting device and a method for detecting a train position by electric power line communication using a tramline that can identify the train position in a train operation control room in real time while the train is stopped.

The current train location detection technology uses a variety of methods. The most popular method is to use a track circuit, but recently, a method using a wireless communication technology can detect a train position with high precision. Typical wireless communication used in railway uses leaky coaxial cable (LCX), wireless LAN, mobile communication technology and RFID technology. The location of trains is detected using these wireless communication technologies and speed sensors or odometers.

1A is a diagram illustrating a method of calculating a distance traveled by a train using a speed sensor or a odometer in a train according to the related art. In order to compensate for the errors in the process of calculating the train mileage, the absolute position value of the ground man using the RFID technology installed on the track is used. The train transmits the train position value of which the error value is corrected to the train control device on the ground by using a wireless device such as LCX, wireless LAN or mobile telephone network.

Train speed calculations for electric vehicles generally use the number of revolutions of the motor. The rotational speed of the main motor is reduced to the gear ratio and transmitted to the wheel. Therefore, the train speed can be expressed by the following equation.

V: Train speed [km / h]

n: main motor speed [rpm]

D: Wheel diameter [m]

G: Company cost [constant]

Train speed is proportional to the main motor speed and wheel diameter and inversely proportional to the reduction gear ratio. In addition, the distance traveled by the train can be calculated using the above equation, which can be expressed as follows.

L: Train driving distance [km]

The wheel diameter of the train and the reduction gear ratio have a very small effect on the calculation of train speed and train mileage, and the speed sensor that detects motor revolutions has a great influence on the calculation of train speed and mileage. In particular, when calculating the train travel distance by integrating the train speed, since the speed sensor includes an error, driving the long distance affects the accuracy of the train travel distance value.

The train odometer is used instead of the train speed sensor, and the train travel value can be extracted first and the train speed can be calculated based on this. The logarithm scale is used to achieve the right level of precision, whether the train is traveling short or long distances. For example, if 8 bits are used for the fractional part of the common log value, the accuracy of ± 0.5% can be obtained. The exponent part uses 4 bits.

Train driving distance L =

N / 256: Singer

M: exponent

N: number of steps (has 0 ~ 255)

The train speed is calculated by differentiating the train driving distance value obtained above from time.

Train speed V =

FIG. 1B is a diagram illustrating a method for detecting a train position using an enhanced position & location reporting system (EPLRS) as another conventional method. This method extracts the communication delay time that occurs when transmitting data between the radio device (device 1) on the train and the device (device 2) on the ground, and detects the train location by applying line linear information and triangulation method. That's how.

Device 1 and Device 2 are synchronized with each other by TDMA. However, due to the uniqueness of each device, it is not synchronized correctly and there is a slight difference. This is called an offset. In slot N, the device 1 has a slight delay in transmitting information from device 1 to device 2, but the delay time is TOA1. When slot N + M, information is transmitted from device 2 to device 1, which also has a delay time and is TOA2. Both TOA1 and TOA2 contain an offset. However, when TOA1 and TOA2 are combined, there is no offset and only pure propagation delay time. Therefore, the propagation delay time is expressed as follows.

Delay = (TOA1 + TOA2) / 2

Since the speed at which radio waves are transmitted is the speed of light, the distance between device 1 and device 2 can be expressed as follows.

Distance between devices L = luminous flux * delay time

In order to increase the accuracy and precision of the distance between devices, device 1 may communicate with other devices as well as device 2 to calculate a plurality of distance values, and apply the result to triangulation to check the current location of device 1.

The existing train location detection methods and devices are applied to the train operation control and management.

The method of applying the wireless communication shown in FIG. 1A tracks the train position with higher precision than the conventional track circuit method, and the number of devices installed on the side of the track is drastically reduced, thereby increasing reliability and reducing maintenance costs. Has the advantage of. In case of wireless LAN, however, the transmission power is low. Therefore, the radio equipment installed on the ground should be installed closely on the side of the track. In the case of the mobile communication system, the transmission power is high. A separate communication medium should be installed in the basement.

When the train stops and departs due to the failure of the onboard train control system due to the abnormal situation of train operation, the current train position value should be known exactly. However, when detecting the train position in the train, a lot of errors occur between the train position information detected in the abnormal situation or the train position information detected and the actual train position information. In order to solve this problem, the software method, mechanical method or train operation method is applied, but the fundamental problem cannot be solved.

In the case of using the radio propagation delay time as shown in EPLRS shown in FIG. It ensures higher safety than the way of detecting train position in the car. However, this method detects the train position by triangulation based on the propagation delay time and the track linear information of the train. In order to increase the accuracy of the train position detection value, a lot of radio devices should be installed on the side of the track. If the radius of curvature is small and the gradient is large, such as a light train, there is a problem that more radio devices should be installed to secure a viewing angle.

Accordingly, an object of the present invention is to solve the conventional problems as described above, by applying the power line communication technology to the tram line to detect the train position and use the train position detection information in the train operation control management, the safety and efficiency of the train operation The purpose of the present invention is to provide a train position detecting apparatus and method for detecting a train position by power line communication using a catenary which can be increased.

Train position detection device for detecting the train position by the power line communication using the tram line of the present invention for achieving the above object, the ground control device for detecting and controlling the train location, the ground control device and the general communication line It is characterized in that it comprises a substation connected to the power line communication line of the tram line, and a vehicle control device connected to the substation and detects the train position and controls the train speed.

In addition, the ground control device is characterized in that for selecting the communication line based on the train location information.

The substation may further include a signal coupling device that is responsible for transmitting information between the ground control device and the onboard control device; A demodulation and demodulation device for demodulating the modulated signal transmitted from the signal coupling device according to the communication specification of the ground control device and modulating the signal of the ground control device according to the signal coupling device; And a synchronization module connected to the submodulation and demodulation device for calculating the position of the train in the section based on the position of the substation.

In addition, the on-vehicle control device is connected to the demodulation device installed in the train, characterized in that connected to the substation through a signal coupling device connected to the modulation and demodulation device.

In addition, when the ground control device or the on-vehicle control device can not determine the train position due to serious obstacles in the tram line or train, it characterized in that it comprises calculating the train position by using an impulse device.

In addition, the train position is characterized by calculating using the time when the impulse wave is input and the return time reflected.

On the other hand, the train position detection method for detecting the train position by the power line communication using the tram line according to an embodiment of the present invention, the modem of the sub-modulation and demodulation device of the substation and the modem of the train demodulation device for the initialization of the communication is synchronized by the synchronization module (B) transmitting a transmission time from a modem, which is a modulation / demodulation device on the sending side, to a modem, which is a modulation / demodulation device on the receiving side, and transmitting a transmission time when transmitting information received by the modem on the receiving side to a control device. Including a packet and transmitting the data; calculating a distance between the transmitting modem and the receiving modem; calculating a train location based on the distance between the modem and the position data of the substation; and the calculated value of the train location. If the allowable error is exceeded, start again from the synchronization step. If the allowable error is not exceeded, the train And determining the position.

According to the present invention, a train position detecting apparatus and a method for detecting a train position by power line communication using a catenary according to the present invention do not require additional equipment because the power line communication method is applied, and thus maintenance is simple and economical. It's so simple that you can make your program more reliable.

In addition, it is possible to check the location of trains that are stopped in case of serious failure, so that they can quickly deal with the failure.

.

1A is a view for explaining a method for detecting a train position in a train using conventional wireless communication;
Figure 1b is a view for explaining a train positioning method by measuring the conventional arrival time,
2 is a conceptual diagram of a train position detecting apparatus according to the present invention;
3 is a block diagram illustrating a connection relationship between a ground control device, a device included in a substation, and an electric vehicle line according to the present invention;
4 is a block diagram illustrating a connection relationship between a vehicle control apparatus and other devices included in an interior of a train according to the present invention, and a tram line;
5 is a conceptual diagram illustrating a method for detecting a train position using a time difference when a data packet is sent from a modem of a transmitter and a data packet is received from a modem of a receiver according to the present invention;
FIG. 6 is a flowchart illustrating a process of calculating a train position by using a position of a substation and a distance value between modems in a ground control device or a vehicle control device according to the present invention; FIG.
7 is a conceptual diagram for calculating the train position by using an impulse device when the train position can not be confirmed due to a serious obstacle of the tram line or the train according to the present invention.

Hereinafter, a specific embodiment for implementing the spirit of the present invention will be described in detail with reference to the drawings.

2 is a view schematically showing the configuration of a train position detection apparatus for detecting a train position by power line communication using a tram line according to an embodiment of the present invention.

2, the train position detection device for detecting the train position by the power line communication using the tram line in accordance with an embodiment of the present invention is connected to the substation 30 through the substation 30, the general communication line (L1) The control apparatus 10 and the substation 30 may include a vehicle control apparatus 20 connected through a power line communication (PLC) line L2.

The PLC line L2 for supplying power to the train may be connected to the substation 30 to receive power. The PLC line L2 may be divided into a plurality of sections, and may be connected to the substation 30 for each section.

The ground control apparatus 10 performs a function of communicating with the substation 30 through the general communication line (L1), calculates the train position based on the data received from the substation 30, and controls and manages the train operation. Do this. The ground control apparatus 10 performs a function of setting a communication line based on train location information. If the train 50 is in section M, it communicates with the substation 30 located closer to the train 50. If the train 50 moves to section M + 1, the train 50 is located closer to the train 50. Communicate with substation 40.

The on-vehicle control device 20 is installed in the train 50 and communicates with the substation 30 through the power line communication line (L2), calculates the train position based on the data received from the substation 30 and calculates the train speed. Function to control.

3 is a block diagram illustrating a connection relationship between a ground control apparatus according to an exemplary embodiment of the present invention, a device included in a substation, and a catenary.

Referring to FIG. 3, the substation 30 has a signal coupling device 31 and a modulation / demodulation device (MODEM) 32 that are responsible for the stable transmission of information between the ground control device 10 and the on-vehicle control device 20. ) And a synchronization module 33 are installed.

The signal coupling device 31 is an electrical device that electrically insulates the PLC line L2 and the modulation / demodulation device 32 and is responsible for impedance coupling.

The demodulation and demodulation device 32 demodulates a modulated signal transmitted from the signal coupling device 31 in accordance with the communication specifications of the ground control device 10 and, conversely, converts a signal of the ground control device 10 into the signal coupling device ( Modulate according to 31).

The synchronization module 33 of the substation 30 and the synchronization module 53 of the train are used for the purpose of calculating the position of the train in the section based on the position of the substation 30 as a reference for position calculation.

4 is a block diagram illustrating a connection relationship between an on-vehicle control device and other devices included in the train according to the present invention, and a catenary.

Referring to Figure 4, the train 50 is installed on the vehicle control device 20, the signal coupling device 51, the modulation and demodulation responsible for the stable information transmission between the vehicle control device 20 and the ground control device (10) A device 52 and a synchronization module 53 are provided.

The train is provided with the signal coupling device 51, the submodulation and demodulation device 52, the synchronization module 53 and the vehicle control unit 20 in the substation. The roles of the signal coupling device 51, the shifting-change device 52 and the synchronization module 53 installed in the train 50 are the same as those of the substation 30.

The synchronization module 33 of the substation 30 and the synchronization module 53 of the train are used for the purpose of calculating the position of the train in the section based on the position of the substation 30 as a reference for position calculation.

5 is a conceptual diagram illustrating a method for detecting a train position using a time difference when a data packet is sent by a modem of a transmitter and a data packet is received by a modem of a receiver according to an embodiment of the present invention.

Referring to FIG. 5, the demodulation device (modem A) of the substation 30 for supplying power to the section M and the demodulation device (modem B) of the train 50 driving the section M are the synchronization modules 33 and 53. Time is synchronized. The modulation and demodulation device (modem A) of the substation 30 transmits the data packet transmitted from the ground control device 10 to the modulation and demodulation device (modem B) of the train 50 at t = T0 [s]. The modem B receives the data packet transmitted by the modem A at t = T1 [s]. The time required for transmitting information from the modem A to the modem B becomes T1.

If the speed at which data is transmitted from modem A to tram line to modem B is V [m / s], the distance between modem A and modem B can be calculated as follows.

Distance [m] = V [m / s] × T1 [s]

By tracking the change in the distance between the modem A and the modem B, it is possible to determine whether there is an error in the driving direction of the train 50 and the position calculation of the train 50.

For example, when the distance value between modem A and modem B decreases, it may be determined that the train 50 travels in the direction of the substation. If the distance value increases, the train 50 may determine that the train 50 runs in the reverse direction of the substation. In addition, if the calculated distance value frequently exceeds the allowed error width, it can be confirmed that an error occurs in the synchronization module and the calculation process.

6 is a flowchart illustrating a process of calculating a train position by using a position of a substation and a distance value between modems in a ground control apparatus or a vehicle control apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the on-vehicle control device 20 or the ground control device 10 performs communication initialization to calculate the train position, and the modem, which is a modulation / demodulation device, transmits the time T0 transmitted when transmitting data. Include in data packet. In addition, the modem includes the received time T1 in the data packet when the received data packet is transmitted to the onboard control apparatus 20 or the ground control apparatus 10. The on-vehicle control apparatus 20 or the ground control apparatus 10 calculates the train position by using the position of the substation in the section M and the distance between modems.

Distance between modems (L) = speed at which data is transmitted (V) × (T1-T0)

Train position (P) = substation reference position + distance between modems (L)

If the train position calculation value exceeds the allowable error, the train position is determined if the allowable error is within the allowable error.

Because the tram lines are installed along the rails on which the train travels, the distance between modems is equal to the distance between substations and trains. For high-speed trains or subways, trains are 200 [m] long. It is 300 [m] and the current collector which collects power is installed at the head or the rear of the train. Some trains are installed in the middle of trains. Check the position of the train modem to use when initializing communication.

FIG. 7 is a conceptual diagram of calculating train positions by using an impulse device when the train position cannot be identified due to a serious obstacle of a catenary or a train according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the train position is tracked by using an impulse device in consideration of the case where the train position cannot be identified due to a serious obstacle of the tram line L2 or the train 50. In general, the purpose of using the impulse wave is to check the channel characteristics of the communication line, and when the impulse wave is injected into the tank line (L2), some signals that are not absorbed by the substation 30 or the vehicle transformer on the receiving side are shown in the figure. Reflected together, it returns to the transmitter. The position of the load stage can be calculated using the time when the impulse wave is applied and the time when the reflected pulse is returned. The train position can be obtained as follows.

Distance from substation to train [m] = {transmission speed V [m / s] × (T1-T0) [s]} / 2

While the above has been shown and described with respect to preferred embodiments and applications of the present invention, the present invention is not limited to the specific embodiments and applications described above, the invention without departing from the gist of the invention claimed in the claims Various modifications may be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

10: ground control device 20: onboard control device
30,40: Substation 50: Train
L1: General communication line L2: Power line communication line, tram line
31, 51: signal coupling device 32, 52: modulation and demodulation device
33,53: Sync module

Claims (7)

A ground control device that detects a train location and controls and manages train operation;
A substation connected to the ground control device and a general communication line and connecting a power line communication line of a tram line; And
A train position detecting device for detecting a train position by power line communication using a catenary, characterized in that it is connected to the substation and detects a train position and controls a train speed.
The method of claim 1,
The ground control device is a train position detection device for detecting a train position by power line communication using a tram line including selecting a communication line based on train position information.
The method of claim 1,
The substation may include: a signal coupling device that is responsible for transmitting information between the ground control device and the onboard control device;
A demodulation and demodulation device for demodulating the modulated signal transmitted from the signal coupling device according to the communication specification of the ground control device and modulating the signal of the ground control device according to the signal coupling device; And
Train position detection device connected to the demodulation device for detecting the train position by the power line communication using a train line including a synchronization module for calculating the position of the train in the section based on the position calculation of the substation position.
The method of claim 1,
The on-vehicle control device is connected to the demodulation device installed in the train, the train position detection device for detecting the train position by the power line communication using a catenary, characterized in that connected to the substation through a signal coupling device connected to the demodulation device.
The method of claim 1,
When the ground control device or the on-board control device cannot identify the train position due to a serious obstacle of the tram line or the train, the train detecting the train position by power line communication using a tram line including calculating a train position by using an impulse device Position detection device.
The method of claim 6,
Wherein the train position is a train position detection device for detecting the train position by the power line communication using a tram line, characterized in that calculated using the time when the impulse wave and the return time.
Synchronizing the modem, which is a demodulation device of a substation, and a modem, which is a demodulation device of a train, for initialization of communication;
Transmitting, by the modem, which is a modulation / demodulation device on the transmission side, to a modem, which is a modulation / demodulation device on the receiving side, by including a transmission time in a data packet;
Transmitting transmission time including the transmission time in the data packet when transmitting the information received by the modem on the receiving side to the control device;
Calculating a distance between the transmitting modem and the receiving modem;
Calculating train positions based on the distance between the modems and the position data of the substation; And
If the calculated value of the train position exceeds the allowable error, start again from the synchronization step, and if it does not exceed the allowable error, detect the train position by power line communication using a catenary, characterized in that determining the train position. How to detect train location

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