KR20170001387A - Control system of platform screen door - Google Patents

Abstract

The present invention relates a control system for a platform screen door (PSD), comprising: an on-board control device part, a ground control device part, and a PSD integrated control panel. The on-board control device part comprises: an on-board signaling device that generates data on door opening and closing information; an on-board control unit (MCU) that receives the data on door opening and closing information from the on-board signaling device and modulates the data, thereby generating a visible-ray signal; and a transmitting part that transmits the visible-ray signal to the ground. The ground control device part comprises a receiving part being installed on the ground and receiving a visible-ray signal from the on-board control device part. The PSD integrated control panel controls opening and closing of the PSD by using the visible-ray signal. Accordingly, the present invention provides a control system for a PSD using a visible-ray communications technology for eliminating possibility that a potential error occurs in the control system for PSD caused by mutual interference of radio waves.

Description

{CONTROL SYSTEM OF PLATFORM SCREEN DOOR}

The present invention relates to a platform screen door control system using visible light communication.

The city railroad history and tunnels are equipped with systems such as vehicles, electricity, signaling, communication, and machinery for the transport of trains and the safe transport of passengers. Of these, the communication system is performed in the presence of various radio environments due to the special characteristics of the underground space.

However, among the systems operated in an urban railroad environment, a radio control device for a platform screen door (hereinafter referred to as "PSD"), which is a platform security device, does not have an assigned natural frequency, Medical band). In addition, most of the facilities that utilize the frequency of the ISM band are not allocated to the natural frequencies except for the radio equipment of the train, which is a mobile radio communication device. Therefore, wireless communication in the ISM band is low in reliability, and therefore the urban railway operating system always has a probability of occurrence of a system error due to mutual interference caused by a weak radio wave environment. This has serious problems directly connected with the safety of citizens using urban railways.

An object of the present invention is to provide a platform screen door control system using visible light communication technology capable of solving the possibility of potential error of a screen door control system due to mutual interference of radio waves and capable of stable control of a screen door.

According to another aspect of the present invention, there is provided a platform screen door control system including: an onboard signaling device for generating doorway opening and closing information data; a control unit for receiving doorway opening and closing information data from the onboard signaling device, An on-vehicle control unit (MCU) for generating a visible light signal, and a transmitter for transmitting the visible light signal to the ground side; A terrestrial control unit provided on the ground side and including a receiver for receiving a visible light signal from the on-board control unit; And a PSD integrated control panel for controlling the opening and closing of the platform screen door (PSD) using the visible light signal.

In addition, the transmitter of the on-board control unit includes at least one LED, and the receiver of the terrestrial control unit includes at least one photodiode (PD).

In addition, the LEDs may be arranged at predetermined intervals along the traveling direction of the electric vehicle, and the photodiodes may be arranged to correspond to the LEDs.

The terrestrial control unit may further include an optical filter.

The optical filter may be a polarizing filter or a color filter.

In addition, the optical lens may be mounted on at least one of the transmitting unit and the receiving unit.

Further, an LED driver can be disposed between the vehicle-mounted control unit (MCU) of the on-board control device and the transmitter.

The door opening / closing information data includes a train master number (TI), a left and right door opening (TLO), a left door closing (TLC), a right door opening (TRO) and a right door closing (TRC) And the on-board control unit may implement the frame structure as a visible light signal by using a plurality of LEDs.

According to the platform screen door control system according to the embodiment of the present invention, because of the use of the visible light communication (VLC), there is no problem of frequency allocation for wireless communication and interference with radio waves, There is no fear of the possibility of the problem.

In addition, since visible light communication can transmit data only where visible light is present, excellent reliability and security can be provided.

In addition, there is an advantage that it is particularly easy to use in a structural environment of an underground tunnel vulnerable to wireless communication.

1 is a diagram illustrating a concept of wireless communication in a PSD control system according to an embodiment of the present invention.
FIG. 2 is a diagram showing a configuration of an on-vehicle control unit and a ground control unit constituting a PSD control system according to an embodiment of the present invention, and visible light communication (VLC) therebetween.
3 is a diagram illustrating an array structure of a transmitter (LED) and a receiver (PD) according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unnecessary. The terms described below are defined in consideration of the structure, role and function of the present invention, and may be changed according to the intention of the user, the intention of the operator, or the custom.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art to which the present invention pertains, It is only defined by the scope of the claims. Therefore, the definition should be based on the contents throughout this specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

In the urban railway environment, the gate control of the PSD device includes a method of interfacing with a signal device responsible for stopping, starting, and controlling the speed of a train, and a method of controlling a door by a separate wireless device. It is only about 10 years ago that PSD introduction was activated in Korea. Most of the existing signal systems do not consider PSD control, and there are many PSD control devices of wireless communication type because of cost advantage.

The wireless communication method control directly controls the landing screen door by transmitting the command of the PSD onboard control device of the train to the history PSD comprehensive control panel, and the radio frequency uses the frequency of 2.4GHz or 430MHz band. The PSD on-board controller is mounted on the inner panel of the screen door at the stationary position of each of the ascending and descending trains.

Compared with such conventional technology, the present invention proposes a control system of a platform screen door using visible light communication (VLC) without radio wave interference.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating a concept of wireless communication of a PSD control system according to an embodiment of the present invention. FIG. 2 is a block diagram of a configuration of a vehicle control unit and a ground control unit constituting a PSD control system according to an embodiment of the present invention. And visible light communication (VLC) between them.

The onboard controller unit 100, which is a transmitting side, includes a car signaling apparatus 110 for generating doorway opening / closing information data, a control unit for receiving doorway opening / closing information data from the onboard signaling apparatus 110, modulating the doorway opening / An on-vehicle control unit (MCU) 120 for generating a signal, and a transmitter 130 for transmitting the visible light signal to the ground side. The onboard controller 100 connects the door control line of the onboard signaling device 110 of the electric vehicle 10 so that automatic opening can be realized. Also, it is configured to be controlled by the operation of the train driver by connecting with the manual switch. The data created by the onboard signaling device 110 includes information on the opening and closing of the doors, information on opening and closing of the left and right doors, and information on the arrangement of the vehicle. This data is transmitted to an on-vehicle control unit (MCU) 120 connected by serial communication. The on-vehicle control unit (MCU) 120 modulates the transmitted data into a visible light signal. For example, the on-board control unit (MCU) 120 may be configured to transmit and generate an LED visible light signal by turning on / off the LED as the transmitter 130 using On-Off Keying (OOK) modulation . At this time, an LED driver is disposed between the on-board control unit (MCU) of the on-vehicle control unit and the transmitter, and the brightness of the LED and stable control of the LED can be performed using the LED driver (140).

On the other hand, the terrestrial control unit 200 on the receiving side includes a receiving unit 210 provided on the ground side and receiving a visible light signal from the on-board control device 100. In addition, the terrestrial control unit 200 may further include an optical filter 230. The terrestrial control unit 200 filters out noise from visible light signals (LED signals) and noise mixed signals by using the optical filter 230 described above, and generates a photodiode Diode (PD), and transmits the visible light signal to the ground control unit (MCU) 220.

On the other hand, the PSD integrated control panel 300 controls the opening and closing of the platform screen door PSD using the visible light signal received from the ground control unit (MCU) 220. That is, in the PSD integrated control panel 300, the signal received from the ground control unit (MCU) 220 is demodulated, the door control information is transmitted to the PSD integrated control panel 300, the PSD status information is received, 400 < / RTI >

According to an embodiment of the present invention, the door opening / closing information data includes at least one of a train identification number (TI), a left and right door opening (TLO), a left door closing (TLC), a right door opening (TRO), a right door closing , And the onboard control unit 100 implements the frame structure as a visible light signal by using a plurality of LEDs.

Specifically, the PSD control system according to an embodiment of the present invention applies the frame structure of the existing data transmission method as it is for compatibility with the existing PSD, but transmits data using the visible light signal (LED signal) . At this time, the existing frame structure, that is, the data format, can be configured as shown in Table 1, similar to that used in an actual PSD system.

Field STX MSG CR LF ETX Size 1 byte N byte 1 byte 1 byte 1 byte

The MSG (message) part includes connection information, door opening and closing information, left and right door information, etc., and is transmitted in ASCII code.

Closed, left and right doors, and vehicle configuration information from the vehicle on the ground, and the received information is transmitted to the PSD integrated control panel 300 by the visible light communication device VLC. The PSD comprehensive control panel 300 controls the door using the received information and transmits the status information to the PSD status indicator 400. [ Actually, a very small data of about 100 bits is transmitted and received. This means that more reliable data transmission (lower bit error rate) is more important than a higher transmission rate.

The PSD control system according to the preferred embodiment of the present invention configures a data frame as shown in [Table 2] below when the visible light signal is transmitted from the onboard control apparatus unit 100 to the terrestrial control apparatus 200 , It is also possible to control the PSD using a plurality of LEDs.

SOF Train
Information MSG
EOF TLO TLC TRO TRC 8bit 4bit 1bit 1bit 1bit 1bit 8bit

- SOF: Start Of Frame - TI: Train Information (train number)

- MGS: Message (door opening and closing information)

- TLO: Train Left Door Open - TLC: Train Left Door Close

- TRO: Train Right Door Open - TRC: Train Right Door Close

- EOF: End Of Frame

The data frame transmission scheme applies selective diversity to select the strongest signal among signals received in a plurality of photodiodes (for example, five in this experiment) It is possible to recognize the SOF 101010 first and then control the right and left doors using vehicle information confirmation and MSG data.

On the other hand, in the PSD control system using visible light communication, it is important to solve the problems of securing the communication distance, the interference problem due to the ambient light, and the problem of implementing the optimal structure of the control system. An embodiment of the present invention can solve the above-described problems.

[Problem of securing communication distance]

According to an embodiment of the present invention, an optical lens (not shown) may be mounted on at least one of the transmitter 130 and the receiver 210. The exact distance between the electric motor vehicle 10 and the PSD is about 2 m. However, when the electric vehicle 10 fails to make a stop in a certain position, or if the electric motor vehicle 10 is undercurrent or understeer, a distance error of about 1 m may occur. Therefore, it is necessary to secure a communication distance of at least 3 m.

In order to secure the communication distance, a method of concentrating the light to the receiving unit 210 may be adopted by using a high output LED such as a COB LED (Chips on Board LED) or by applying an optical lens used for a flashlight. If the optical lens is installed in the receiving unit 210, it is possible to extend the communication distance by enhancing straightness of light and reducing scattering. It is also possible to consider extension of the communication distance by the modulation.

[Interference problem by ambient light: noise light]

According to an embodiment of the present invention, the terrestrial control unit 200 includes an optical filter 230, and the optical filter 230 may be a polarizing filter or a color filter.

The track of the platform portion of the history 20 is obscured by the PSD, but may be interfered by the internal light, the reflected light of the headlight of the electric vehicle, and the like. The interference problem caused by the ambient light can be solved through the polarizing filter and the color filter. The polarizing filter can filter refracted or reflected light that is not within a certain angle of the line-of-sight (LOS). In addition, the color filter can obtain selective information by passing only light of a desired color. Particularly, there is a high possibility of being interfered by the headlight of a train coming from Maju. Since most of the headlights are white lights, this can be blocked by using a color filter. Furthermore, since white, yellow, and red light are mainly present in the tunnel, the effect can be maximized when the blue LED is used.

[Problem of Optimal Structure Implementation of Control System]

3 is a diagram illustrating an array structure of a transmitter (LED) 130 and a receiver (PD) 210 according to an embodiment of the present invention. According to an embodiment of the present invention, the transmitter 130 of the onboard controller 100 includes at least one LED, and the receiver 210 of the terrestrial controller 200 includes at least one photodiode (PD), and the LEDs are arranged at predetermined intervals along the traveling direction of the electric vehicle 10, and the photodiodes can be arranged to correspond to the LEDs.

On the other hand, the inventor has conducted an experiment to test the state of data transmission / reception between the onboard control apparatus section 100 and the terrestrial control section 200. In the experiment, the onboard signal device 110 connected to the on-vehicle control unit (MCU) 120 and the PSD integrated control panel 300 used a computer for simulation. At this time, the visible light signal used in the on-board control unit (MCU) 120 of the on-vehicle control unit 100 as the transmitting side uses a 3W-level red LED and the terrestrial control unit 200 on the receiving side uses a TSL252R illuminance sensor, A polarizing filter, and a red filter. As a result of generating and transmitting data in the computer, it was confirmed that data transmission and reception are normally performed.

On the other hand, if the color LED is used and the filter is installed, it can be confirmed that even if interference of light such as random noise generated by shaking the flashlight toward the surrounding fluorescent lamp and the receiving unit 210 is given, it is not affected. Accordingly, it can be expected that the platform screen door control apparatus according to an embodiment of the present invention can be applied to an actual urban railway tunnel environment.

Since the distance of visible light communication can be extended according to the output of the LED and the use of the lens, no further tests have been carried out, and detailed data on the selection of suitable LED and the mounting position etc. I want to.

The present invention proposes the application of visible light communication as a solution to improve the problem of a PSD radio control device among radio devices operating in an urban railroad environment. It is possible to apply PSD according to the characteristics of the PSD door control device which has relatively small amount of data and a short transmission distance and can solve the illumination interference of visible light communication through the use of color LED and optical filter. In addition, the visible light communication can be further applied to the local communication field such as signal-based train position information detection and line branch signal processing in an urban railway tunnel environment with poor radio wave environment.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention is not limited thereto and that various changes and modifications may be made therein without departing from the scope of the invention.

10: Train 20: History
100: on-vehicle control unit 110: onboard signal device
120: an on-vehicle control unit (MCU) 130: a transmitter
140: LED driver 200: Ground control unit
210: Receiving unit 220: Ground control unit (MCU)
230: Optical filter 300: PSD integrated control panel
400: PSD status indicator

Claims (8)

A platform screen door control system,
An on-vehicle control unit (MCU) for receiving the door opening / closing information data from the on-vehicle signaling device and modulating the door opening / closing information data to generate a visible light signal; An on-vehicle control unit including a transmitting unit for receiving the vehicle signal;
A terrestrial control unit provided on the ground side and including a receiver for receiving a visible light signal from the on-board control unit; And
A PSD integrated control panel for controlling opening and closing of a platform screen door (PSD) using the visible light signal;
Wherein the platform screen door control system comprises: The method according to claim 1,
Wherein the transmitter of the on-board control unit includes at least one LED, and the receiver of the terrestrial control unit includes at least one photodiode (PD). 3. The method of claim 2,
Wherein the LEDs are arranged at predetermined intervals along the traveling direction of the train, and the photodiodes are arranged to correspond to the LEDs. The method according to claim 1,
≪ / RTI > wherein the terrestrial control portion further comprises an optical filter. 5. The method of claim 4,
Wherein the optical filter is a polarizing filter or a color filter. The method according to claim 1,
And wherein an optical lens is mounted on at least one of said transmitter and said receiver. The method according to claim 1,
And an LED driver is disposed between the on-board control unit (MCU) of the on-board control unit and the transmission unit. 3. The method of claim 2,
The door opening / closing information data includes a frame including a train master identification number (TI), a left and right door opening (TLO), a left door closing (TLC), a right door opening (TRO), and a right door closing (TRC) And the on-board control unit uses the plurality of LEDs to implement the frame structure as a visible light signal.

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