KR0157944B1 - Radio control and apparatus for traffic signal - Google Patents

Abstract

The present invention relates to a method and apparatus for wirelessly controlling a traffic signal, and in the related art, when a traffic control variable setting value needs to be continuously changed according to a seasonal or gradual increase in traffic volume, a maintenance agent dispatches a site to update an input value. Because it depends on the method, it requires a lot of people and costs, and even when a central traffic control center is installed, remote control such as online operation of the host and central manual operation is impossible, so that it cannot cope with changing traffic conditions quickly. There was a problem. In order to improve such a problem, the present invention provides a simple control center when a central control is not implemented so as to complement the interlocking signal line method and the time signal receiving method and ensure smooth signal operation. Invented to enable remote control, the present invention can remotely set the traffic control variables to eliminate the consumption of a large number of people and budgets due to the on-site dispatch of maintenance personnel to set the existing traffic control parameters, Various remote control modes enable faster and smoother traffic signal operation.

Description

Traffic signal wireless control method and apparatus

1 is a block diagram showing a conventional interlocking signal line method.

2 is a block diagram showing a conventional time signal receiving method.

3 is a block diagram showing a radio control method of the present invention.

4 is an exemplary view showing the configuration of a data frame of the present invention.

5 is an exemplary view showing the configuration of a remote control mode of the present invention.

6 is a block diagram of a wireless data receiving apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

201-1 ~ 201-3: Intersection 201-1 ~ 202-3: Traffic signal controller

203: central control unit 204: data transmission path

205: wireless data transmitting device 206-1 to 206-3: wireless data receiving device

210: data receiving circuit 211: high frequency amplifier

212: synchronization unit 213: demodulation unit

214: frame data detector 220: data verification circuit

221: address setting unit 222: address comparison unit

223: password storage unit 224: password confirmation unit

230: microcomputer

The present invention relates to a traffic signal controller, and in particular, a traffic signal wireless control method for enabling remote control by wirelessly transmitting an arbitrary control command as well as operation of a time of day (TOD) mode based on a reference time value; Relates to a device.

In general, the traffic signal controller has an operation characteristic of sequentially displaying the traffic light output pattern, which is basically set, and then, when one cycle ends, the expression of the first traffic pattern is started again and the sequential output of the same pattern as the previous period is repeated.

Here, the period from the start of the traffic light output pattern back to the beginning and the time of starting the repetitive operation is called a cycle, and the operation of every step of changing the traffic light output pattern in one cycle is performed.

In such traffic signal controllers, maintaining a light level with an adjacent traffic signal controller is a basic requirement of signal control, which means that a traffic movement flow maintaining an average speed from a previous intersection is not blocked by a red signal when the traffic signal reaches an adjacent intersection. It means that the green signal is continuously guaranteed.

Therefore, in the installation and operation of the traffic signal controller, a large city has a traffic control center in the center, and the traffic signal control period of each intersection and the host computer installed in the traffic control center are connected by wired communication means to facilitate the traffic traffic of the whole city. Control to maintain it.

In the case of small cities and national roads where there is no traffic control center in the center but only traffic signal controllers at each intersection are installed and operated, it is difficult to secure signal interworking during traffic signal control periods of adjacent intersections. How to secure the synchronization of mutual signal operation by laying a wired interlocking line in the control period or by receiving the time signal sent by the traffic signal controller at each intersection every hour in the broadcast to correct the error of the built-in clock. Based on the time-based signal operation plan input in advance based on time, two methods of securing interworking between adjacent controllers through signal operation have been used.

In the conventional interlocking signal line method, as illustrated in FIG. 1, interlocking signal lines 113 are embedded between traffic signal controllers 112-1 to 112-3 installed at intersections 111-1 to 111-3, respectively. Configured to connect.

The traffic signal controllers 112-1 to 112-3 are configured to include an interlocking signal transmitting device and an interlocking signal receiving device so as to transmit and receive a signal through the interlocking signal line 113.

In addition, in the conventional time signal receiving method, as shown in FIG. 2, traffic signal controllers 122-1 to 122-3 are installed at intersections 121-1 to 121-3, respectively, and the traffic signal controller 122 is installed. -1 to 122-3 are configured to control a traffic signal by receiving a time signal transmitted at an hourly time from the radio station 123 by incorporating a time signal receiving device.

Referring to the operation of the prior art as follows.

First, in the case of the interlocking signal line method, the traffic signal controller at the reference departure time outputs the interlocking signal, that is, the reference point start signal, to the adjacent traffic signal controller through the interlocking signal line in order to maintain the interlocking of the traffic signals. Assuming that the intersection 11-1 where 112-1 is installed is a reference starting point, the traffic signal controller 112-1 outputs a reference time start signal to the traffic signal controller 112-2 at the reference time point. .

Accordingly, the traffic signal controller 112-2 receives the green signal at the intersection 111-1 to start the traffic flow at the time when the arrival time of the previously inputted average movement flow elapses, thereby departing the traffic flow to start. At this intersection 111-2, the green signal is continuously guaranteed.

At this time, the traffic signal controller 112-2 performs the movement step of the mobile flow and at the same time transmits the reference point start signal to the traffic signal controller 112-3 to receive the traffic signal receiving the green signal at the intersection 111-2. At the next intersection 111-3, the green signal is continuously guaranteed.

This operation is repeatedly performed in association with the adjacent traffic signal control period.

In addition, in the case of the time signal reception method, for example, the configuration of FIG. 2 is received by the broadcast signal receiving device with the built-in traffic signal controllers 122-1 to 122-3. The time of the built-in clock (RTC) is calibrated, whereby the built-in clocks of all the traffic signal controllers 122-1 to 122-3 have a uniform time value at the standard time.

Accordingly, the traffic signal controllers 122-1 to 122-3 guarantee signal interworking with adjacent traffic signal controllers by operating a previously input time zone signal operation plan based on a unified time.

In the prior art, since both the interlocking signal line method and the time signal receiving method are operated based on a traffic control variable, the primary purpose was to transmit or share a reference point required to operate a preset value.

However, in the related art, when the traffic control variable set value needs to be changed continuously according to a seasonal or gradual increase in traffic volume, a maintenance agent has been relied on the method of dispatching an input value to the site.

Therefore, conventionally, since the budgeting and updating work is performed every six months or one year, there is a problem that requires a large number of people and costs.

In addition, conventionally, even in a large city in which a traffic control center is installed in the center, remote control such as host online operation and central manual operation is basically impossible, and thus there is a problem in that it does not respond quickly to traffic conditions that change frequently.

The present invention is to provide a simple control center when the central control is not implemented to complement the interlocking signal line method and the time signal receiving method and to ensure a more smooth signal operation in order to improve the conventional problems and to provide a traffic signal based on a wireless method It is an object of the present invention to provide a wireless control method of the traffic signal controller invented to enable remote control.

According to the method of the present invention, as shown in FIG. 3, wireless data receiving apparatuses 206-1 to 206 are installed in traffic signal controllers 202-1 to 202-3 respectively installed at intersections 201-1 to 201-3. -3), the central control unit 203, which is a control center, transmits a control command to the wireless data transmitting apparatus 205 through the data transmission line 204, and transmits the wireless data receiving apparatus 206-1 to 206-. 3) to send a control command.

The radio data transmission device 205 uses a general radio call transmission device.

As shown in FIG. 6, the wireless data receiving apparatuses 206-1 to 206-3 receive a wireless signal of the wireless data transmitting apparatus 205 to extract original transmission data. And a data verification circuit 220 for determining whether the address of the intersection is the address of the output data of the data receiving circuit 210, and if the address corresponds to the cipher of the intersection, the data verification circuit 220. If the output data of the data is legitimate data, the control unit performs traffic control of the corresponding intersection, and if the change command of the password is configured as a microcomputer 230 for changing the password stored in the data verification circuit 220.

The data receiving circuit 210 includes a high frequency amplifier 211 for amplifying a radio signal received by the antenna ANT to a predetermined level, and a tuning unit for extracting only signals of a frequency band used from the output of the high frequency amplifier 211. 212, to a demodulator 213 for demodulating the output of the demodulator 212 in its original signal form, and to a frame data detector 214 for converting the output of the demodulator 213 into original transmission data. Configure.

The data verification circuit 220 includes an address setting unit 221 for setting an address value of a corresponding intersection and an address input from the data receiving circuit 210 to determine whether the data is for traffic control of the corresponding intersection. An address comparison unit 222 for comparing whether the output of the unit 221 matches, a password storage unit 223 for storing the password of the intersection, a password of the password storage unit 223, and the address comparison unit 222 It consists of a password check unit 224 to determine whether the password of the valuation data matched by).

The microcomputer 203 operates to change the password stored in the password storage unit 223 of the data checking circuit 220 when the content of data input from the data verification circuit 220 is a password change.

Referring to the operation and effect of the present invention configured in this way in detail as follows.

In order to cooperatively control the traffic flow at each intersection 201-1-201-3, the central control unit 203, which is a control center, wirelessly transmits control data as shown in FIG. 4 through the data transmission path 204. The data is sent to the data sending device 205.

The central control unit 203, which is the control center, may be installed in a simple form when the central control center and the host are not provided to implement a single direction communication method among functions used by a host computer in a large city.

The wireless data transmission device 205 transmits the control data received from the central control device 203 to the traffic signal controllers 202-1 to 202-3 installed at each intersection 201-1 to 201-3 as a radio signal. Will be sent.

The traffic signal controllers 202-1 to 202-3 receive data from the wireless data transmitter 205 using the built-in wireless data receivers 206-1 to 206-3. In this case, several remote control operations are performed.

The traffic signal controllers 202-1 to 202-3 restore the high frequency signal received by the data receiving circuit 210 to the antenna ANT to the original data transmitted from the wireless data transmitting apparatus 205, and restores the original data. It is determined whether the data verification circuit 220 is valid data by inputting one data, and the microcomputer 230 controls the actual traffic signal according to the valid data determined by the data verification circuit 220.

The data receiving circuit 210 amplifies the high frequency signal received by the antenna ANT by a predetermined level by the high frequency amplifying unit 211, and the amplified unit selects only the signal of the frequency band used by the tuning unit 212. After detection at 213, the plane data detection unit 214 converts the original transmission data into the original data and outputs the data to the data verification circuit 220.

The data verification circuit 220 determines whether the address comparison unit 222 compares the address value of the corresponding intersection by the address setting unit 221 and the address value input from the data receiving circuit 210 to determine whether the data of the corresponding intersection is the data. If the data is the intersection, the password verification unit 224 determines whether the password stored in the password storage unit 223 and the password of the data input from the data receiving circuit 210 match.

Accordingly, if the passwords match, the determination result and data are transmitted to the microcomputer 230 to be used for the traffic signal operation of the corresponding intersection.

The comparison operation of the ciphers above is for determining whether the received data is normal or abnormal by an outsider because the control data passes through a wireless transmission path having weak security.

In addition, when the same password system is used continuously for a long time, the security is deteriorated, so that the password change mode is set in the remote control mode so that the microcomputer 230 can change the stored password of the password storage unit 223.

Since the remote control mode of the present invention is implemented as shown in FIG. 5, the conventional time adjustment function, as well as the on / off control, the night blink control, the dimming control, the remote manual control, the control mode setting, the database remote input, Operation such as online control can be performed.

On the other hand, the data transmission path 204 and the wireless data transmission device 205 in the above can utilize a commercial facility that is installed and operated in order to avoid the cost incurred and inefficiency due to the separate, the wireless data transmission device 205 may be used to subscribe to a wireless call reception network that is operating for commercial use, in which case it operates by using a general telephone line.

As described in detail above, the present invention can remotely set traffic control variables so that a large number of personnel and budgets can be eliminated due to on-site dispatch of maintenance personnel to set existing traffic control variables, and various remote control The operation of the mode has the effect of enabling the operation of traffic signals more quickly and smoothly.

In addition, the provision of a simple central device has the effect of realizing on-line control similar to traffic control in large cities.

Claims (10)

A traffic signal control method in which a wireless data reception unit is built in a traffic signal controller installed at each intersection to receive wireless data transmitted from a control center and control traffic signals of the intersection when the valid data is valid. A first step of setting a; and a second step of determining whether the set address and the address of the received data coincide; and a second step of determining whether the set password and the cipher of the received data coincide if the addresses match. And a fourth step of performing a remote control mode according to the received data if the password is identical to the password. The method of claim 1, further comprising: changing the setting password if the received data is a password changing command when the passwords match. A traffic signal controller which maintains signal interworking between adjacent intersections to ensure continuous traffic flow, comprising: a central control means for transmitting a control command by embedding a program for controlling the traffic signal, and wirelessly transmitting a transmission command of the central control means; And wireless signal transmitting means for transmitting, and traffic signal controlling means installed at each intersection and receiving and restoring a radio signal of the wireless data transmitting means and controlling the traffic signal of the corresponding intersection if the data is valid data. Traffic signal radio control device. 4. A traffic signal radio control apparatus according to claim 3, wherein the central control means is a simplified central apparatus. 4. The traffic signal radio control apparatus according to claim 3, wherein the radio data transmission means is a commercial radio call transmission apparatus. 4. A traffic signal radio control apparatus according to claim 3, wherein the traffic signal control means incorporates a wireless data radio. 7. The wireless data receiving apparatus according to claim 6, wherein the wireless data receiving apparatus receives a wireless signal of the wireless data transmitting unit and extracts original transmission data, and determines whether the address is at the corresponding intersection by using the output data of the data receiving circuit as an input. A data verification circuit for determining whether the address matches the cipher of the intersection; if the output data of the data verification circuit is valid data, the traffic control of the intersection is performed. A traffic signal radio control apparatus comprising a microcomputer for changing. 8. The data receiving circuit according to claim 7, wherein the data receiving circuit comprises: a high frequency amplifier for amplifying a radio signal received by the antenna ANT to a predetermined level, a tuning unit for extracting only a signal of a frequency band used from the output of the high frequency amplifier, and the tuning unit And a demodulation section for demodulating the output in the form of an original signal, and a frame data detection section for converting the output of the demodulation section into original transmission data. 8. The data verification circuit according to claim 7, wherein the data verification circuit coincides with an address setting unit for setting an address value of the intersection and an address input from the data receiving circuit to determine whether the data is for traffic control of the intersection. An address comparison unit for comparing the data, an encryption storage unit for storing the password of the intersection, and a password confirmation unit for determining whether the password of the password storage unit matches the password of the sum data determined by the address comparison unit. Traffic signal radio control device. 8. The apparatus of claim 7, wherein the microcomputer updates the password stored in the password storage unit of the data verification circuit when the content of data input from the data verification circuit is a password change.