KR200218277Y1 - Advanced electronic traffic signal controller - Google Patents

Abstract

The present invention relates to a traffic signal controller that is installed around the city center and the city to control traffic lights on the roadway by controlling traffic lights at intersections, and in particular, a hybrid time correction unit capable of receiving an accurate time which is most important for signal control at intersections. And an advanced traffic signal controller capable of precisely controlling the signal time of an intersection traffic light using the same.

To this end, the present invention integrates a GPS satellite signal receiver capable of receiving GPS (Global Positioning System) satellite visual signals around the earth, and a radio time signal receiver transmitted from an hourly broadcast station to all regions and hearing loss areas in the country. The railroad crossing to minimize the accident at the railroad crossing by controlling the traffic light at the intersection in parallel with the crossing blocker by detecting the hybrid vision correction unit and the railroad crossing to enter the train in advance. It includes an interface unit.

Description

Advanced / Electronic Traffic Signal Controller {ADVANCED ELECTRONIC TRAFFIC SIGNAL CONTROLLER}

The present invention relates to a traffic signal controller for controlling a traffic light at an intersection, and more particularly to an advanced traffic signal controller having a time correction device for accurate time calculation and a signal control device for controlling a signal in connection with surrounding traffic conditions. It is about.

Traffic control signaling devices for controlling traffic signals at intersections can be classified into general traffic signal controllers, electronic traffic signal controllers and advanced traffic signal controllers. A general traffic signal controller means a traffic signal controller that operates independently at a crossroad regardless of the traffic flow around it. An electronic traffic signal controller is a vehicle detector that collects traffic information by storing a vehicle detector, and inputs and stores it by an operator. It is a system that adopts a method of controlling traffic signals according to the signal systems classified by categories.

On the other hand, the advanced traffic signal controller is equipped with a vehicle detector to collect the current traffic information, and uses the method of calculating the necessary signal control schedule in itself. Meanwhile, the traffic signal controller according to the prior art adopts a method of determining a reference time using a real time clock (RTC) built in to control an intersection signal.

In addition, the traffic signal controller according to the prior art is to control the traffic light of the intersection using the period, manifestation, interlocking value, etc. necessary for a predetermined time zone according to the reference time provided in the above-described manner. However, the reference time of all the traffic signal controllers installed at the intersection on the road must be the same, so that the vehicle flow in the city can be appropriately controlled according to the linkage value.

However, in the traffic signal control system according to the prior art, RTCs mounted on each traffic signal controller installed on a road have a reference time error with each other, and thus, there has been a difficulty in matching traffic interworking. On the other hand, in order to control the time information required by the traffic signal controller online from the central computer has been used to receive the time from the central computer, but in case of communication failure or single control, the clock generated by its own RTC has been used.

In addition, recently, a method of receiving and processing visual information from a radio AM / FM frequency time signal or a GPS satellite has been introduced. However, since the frequency characteristics or the noise characteristics are different in each region, there is a problem in that visual correction cannot be accurately performed when using any one of the aforementioned methods.

In addition, the traffic signal controller according to the prior art has been adopted to control the traffic signal based on the information on the amount of traffic around, but the surrounding traffic conditions (for example, the situation of railroad crossings, or traffic accidents occurring around There have been inconveniences in that the traffic flow cannot be smoothly controlled by controlling the traffic signal without considering the situation. In addition, although the traffic signal controller according to the prior art uses a method of dually controlling the vehicle detection control unit 10 and the driving control unit 14, the dual processing of the control according to the redundancy has many technical difficulties in performing advanced functions. Cause.

That is, the traffic signal controller should establish a signal control policy to perform traffic signal control in real time. The traffic signal controller does not directly control the vehicle signal control unit 10 but transmits a command to the drive control unit 14 to transmit the command to the drive control unit 10. Since the traffic light is controlled through the signal driver 16, various signal manifestations and signal map changes cannot be performed in real time in response to the traffic volume. In addition, when a communication error occurs between the vehicle detection control unit 10 and the drive control unit, serious congestion may occur since the traffic light is driven for the minimum time.

Accordingly, a first object of the present invention is to provide an advanced traffic signal controller that can set and use an accurate reference time in a traffic signal controller anytime and anywhere.

A second object of the present invention is to provide an advanced traffic signal controller for controlling traffic signals by collecting traffic condition information of the surroundings in addition to the first object.

A third object of the present invention is to provide an advanced traffic signal controller that solves a problem of a loss of a traffic signal control function due to a communication failure that may occur by dualizing a vehicle detection control unit and a drive control unit in addition to the first object.

2 is a diagram showing a system configuration of a traffic signal controller according to the present invention;

3 is a diagram illustrating a system configuration of a main controller of a traffic signal controller according to the present invention;

Figure 4 is a view showing an embodiment of a system block diagram constituting a drive management unit according to the present invention.

Figure 5 is a block diagram showing an embodiment of the configuration of a hybrid time correction unit according to the present invention.

Figure 6 is a block diagram showing an embodiment of the configuration of the railroad crossing interface according to the present invention.

<Explanation of symbols for main parts of the drawings>

100: main controller of the traffic signal controller

110: railroad crossing interface unit

120: hybrid time correction unit

130: vehicle detector

140: loop head

150: drive management unit

160: traffic light driver

200: clock generator

201 central processing unit

202: address latch

203: data buffer

204: 2 MByte ROM

205: 4 MByte RAM

206: nonvolatile memory (NVRAM) and real time clock (RTC)

207: communication channel SCC

208: bus buffer

400: 50 MHz clock generator

401: 25MHz CPU

402: address latch

403: 128KB ROM

404: 128 KB of RAM

406: data buffer

501: GPS receiver

502 terrestrial broadcast reception antenna

In order to achieve the above object, the present invention is to receive the traffic volume information from the vehicle detector to generate a traffic variable to calculate the traffic signal cycle value and to derive the present time for each direction; A driving manager which receives a driving control signal from the main controller and performs a special control function such as bulb disconnection and power phase control; A signal light driver for receiving a driving control signal transmitted from the main controller from the driving manager to drive a signal lamp, detecting a voltage or a current of the signal lamp, and feedback the input signal to the main controller; A hybrid time correction unit including a unit that detects a time signal frequency through reception of a terrestrial radio broadcast and a unit that calculates a time through a GPS reception in parallel; And collecting information about the train entry from the railroad crossing breaker control unit and transmitting the information on the train entry to the main control unit, so that the main control unit blocks the entry of the vehicle entering the crossing direction during the train operation time and drives the normal signal in the remaining direction. It provides a traffic signal controller including a railroad crossing interface.

Hereinafter, a traffic signal controller according to the present invention will be described in detail with reference to FIGS. 2 to 6.

2 is a diagram illustrating a system configuration of a traffic signal controller according to the present invention. 2, the main control unit (MCU; main control unit; 100), the drive management unit (SCU; signal control unit; 150) of the traffic signal controller according to the present invention, a solid-state relay unit (SSU) 160 ), Railroad crossing interface unit 110, hybrid time correction unit 120 and the like.

The present invention includes a hybrid time correction unit 120 capable of receiving visual information of a radio time signal or a global positioning system (GPS) satellite, and a railroad crossing interface unit 110 capable of recognizing whether a train enters a railway. Characterized in that the configuration of the signal controller, the upper main control part 100 is installed in the 6U height, the lower drive management unit 150 may be designed to a height of 3U.

When the vehicle passes over the roof head 140 at the intersection, the occupancy time, non-occupancy time, and traffic volume information are accumulated and transmitted to the main control unit 100 by the vehicle detector 130 of the traffic signal controller. Subsequently, the main controller 100 according to the present invention generates traffic variables such as saturation (DS), blockage determination, queue prediction, point speed, and the like to calculate a traffic signal period value, and derives a manifesting time for each direction.

The vehicle detector according to the present invention can detect the straight ahead, left turn, queue, for clogging. The main control unit 100 according to the present invention may perform a back plane communication with the vehicle detection unit 130 and perform RS232 communication with the driving manager.

The main control unit according to the present invention is a communication unit for communicating with the vehicle detection unit 130, the railroad crossing interface unit 110, the hybrid time correction unit 120 and the drive management unit 150, and a drive control signal for controlling the driving of traffic lights And a central processing unit (CPU) that receives a voltage / current detection signal such as a traffic light from the traffic light driver 160 to detect a contradiction state and command an appropriate action.

On the other hand, the hybrid time correction unit 120 according to the present invention by receiving a radio AM / FM signal to extract the time signal frequency to calculate the time and the calculation block for receiving the current time from the GPS satellite and calculates in parallel It can provide accurate reference time.

Referring again to FIG. 2, an LCD display or keyboard may be used as a preferred embodiment of a man machine interface (MMI) 250. In addition, the main control unit 100 of the traffic signal controller according to the present invention can be controlled by connecting a notebook PC through the interface 190 for monitoring.

3 is a diagram illustrating a system configuration of the main controller 100 of the traffic signal controller according to the present invention. The main controller 100 according to the present invention includes a central processing unit (CPU) 201 and includes a clock generator 200, an address latch 202, a data buffer 203, and the like.

The clock generator according to the present invention may use a 50 MHz oscillator, and may use an 80C188EB processor as a preferred embodiment of the CPU 201, and may include a timer, an interrupt controller, a chip select, an I / O port, an oscillator, and a serial input / output (SIO). And the like.

3, a 2 MByte ROM 204, a 4 MByte RAM 205, NVRAM (nonvolatile memory) and RTC (real time clock) 206, a communication channel SCC 207, and the like are shown. ROM 204 and RAM 205 are connected to the P1 VME bus 211 via a bus buffer 208. On the other hand, communication channel SCC 207 is connected to P2 210 via RS232 / RS485.

4 is a view showing an embodiment of a system block diagram constituting a drive management unit (SCU) 150 according to the present invention. 4, a 50 MHz clock generator 400, a CPU 401 of 25 MHz operation, an address latch 402, a 128 KB ROM 403, a 128 KB RAM 404, a data buffer 406, and the like are shown. have.

Figure 5 is a block diagram showing an embodiment of the configuration of the hybrid time correction unit 120 according to the present invention. 5, the hybrid time correction unit 120 according to the present invention is the output of the GPS receiver 501 for receiving a GPS signal received from the satellite reception antenna, and the AM received from the terrestrial broadcast receiving antenna 502 or An AM / FM broadcast receiving unit 503 for receiving FM broadcasts is provided in parallel.

The time signal heard through the AM / FM broadcast receiver 503 is detected by the time signal detector 504. At this time, according to a preferred embodiment of the time signal frequency detection according to the present invention, the KBS time signal evaluator 505 or MBC and other broadcast time signal evaluator 506 are provided in parallel, so that the accurate time is evaluated by the comprehensive evaluator 507. Can be extracted. The exact time extracted according to the present invention may be output to the backplane communication unit 508.

6 is a block diagram showing an embodiment of the configuration of the railroad crossing interface unit 110 according to the present invention. Referring to FIG. 6, a block signal input unit 601 and a breaker standby signal detection unit 602 generated from the crossing circuit breaker 600 are included, and a protection circuit unit 603 and a signal conditioning unit (surge) from a surge or the like are included. 604, evaluation unit 605, output unit 606 and the like.

On the other hand, the signal conditioning unit 604 performs processing so that the evaluation unit 605 can process the output level of the blocking signal lamp.

The foregoing has outlined rather broadly the features and technical advantages of the subject innovation in order to better understand the claims of the subject matter described below. Additional features and advantages constituting the claims of the present invention will be described below. It should be recognized by those skilled in the art that the conception and specific embodiment of the present invention can be used immediately as a basis for designing or modifying other structures for carrying out similar purposes as the present invention.

In addition, the inventive concept and embodiments disclosed in the present invention may be used by those skilled in the art as a basis for modifying or designing other structures for carrying out the same purposes of the present invention. In addition, such modifications or altered equivalent structures by those skilled in the art can be variously changed, substituted and changed without departing from the spirit or scope of the invention described in the claims.

As described above, the present invention accurately synchronizes the reference time of the traffic signal controller through the hybrid time correction unit, thereby accurately synchronizing the linkage between the traffic signal controllers installed in national roads, small cities, and large cities.

As a result, it is possible to reduce the number of stops, delays, air pollution, noise pollution, etc., and to create a pleasant traffic environment and to recognize the incident of trains at railroad crossings to prevent accidents and traffic congestion on the road. have.

Claims (6)

A main control unit that receives the traffic volume information from the vehicle detector, generates a traffic variable, calculates a traffic signal cycle value, and derives a present time for each direction; A driving manager which receives a driving control signal from the main controller and performs a special control function such as bulb disconnection and power phase control; A traffic light driver for receiving a driving control signal transmitted from the main control unit from the driving manager to drive a traffic light, detecting a current of the traffic light, and feeding back the main control unit; A hybrid time correction unit including a unit that detects a time signal frequency through reception of a terrestrial radio broadcast and a unit that calculates a time through a GPS reception in parallel; And Collecting information about the train entry from the railroad crossing breaker control unit and transmits the information to the main control, the main control to block the entry of the vehicle entering the crossing direction during the train operation time and to drive the normal signal in the remaining direction Railroad crossing interface department Traffic signal controller comprising a. The method of claim 1, wherein the hybrid time correction unit AM / FM broadcast receiver; A time signal frequency detector for receiving the detection signal of the AM / FM broadcast receiver; GPS receiver; A comprehensive evaluation unit which receives the output signals of the time signal frequency detector and the GPS receiver, respectively, and calculates a time; A display unit which displays a calculation time of the comprehensive evaluation unit; And Communication unit for communicating the calculation time of the comprehensive evaluation unit to the main control unit Traffic signal controller comprising a. According to claim 1, The railroad crossing interface unit Cutoff signal input unit for receiving a cutoff signal output from the railroad crossing breaker; A circuit breaker standby signal detector for detecting a circuit breaker standby signal output from the railroad crossing breaker; A protection circuit portion connected to the blocking signal input portion; A signal conditioning unit receiving an output of the protection circuit unit; An evaluator for detecting and evaluating a disconnection from the signal conditioner and the breaker standby signal detector; And An output unit for outputting the output of the evaluation unit Traffic signal controller comprising a. According to claim 1, wherein the main control unit receives the occupancy time, non-occupancy time and traffic information transmitted by the straight, left turn, queue or clogged vehicle detector, saturation, blockage determination, queue prediction, point speed, etc. Traffic signal controller, characterized in that to calculate the traffic signal period value by generating a traffic variable, and to derive the present time for each direction. The method of claim 1, wherein the main control unit A communication unit for communicating with the vehicle detecting unit, the railroad crossing interface unit, the hybrid time correction unit, and the driving manager; And A central processing unit which generates a drive control signal for controlling the drive of the traffic light, receives a current detection signal of the traffic light from the traffic light driver, detects a contradiction, and commands an action; Traffic signal controller comprising a. The traffic signal controller of claim 1, wherein the traffic light driver performs a traffic light blinking, a traffic light extinction / dimming, traffic light voltage current detection, power control, and synchronous switching.