CN112735154A - Intersection bidirectional congestion intelligent induction control system and method - Google Patents
Intersection bidirectional congestion intelligent induction control system and method Download PDFInfo
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- CN112735154A CN112735154A CN202110010788.4A CN202110010788A CN112735154A CN 112735154 A CN112735154 A CN 112735154A CN 202110010788 A CN202110010788 A CN 202110010788A CN 112735154 A CN112735154 A CN 112735154A
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- G—PHYSICS
- G08—SIGNALLING
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- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
- G08G1/08—Controlling traffic signals according to detected number or speed of vehicles
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- G—PHYSICS
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- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
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- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
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- G08G1/00—Traffic control systems for road vehicles
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- G08G1/095—Traffic lights
Abstract
The invention discloses an intersection bidirectional congestion intelligent induction control system and method, wherein the system comprises a vehicle queue length geomagnetic detector, an intersection central congestion overflow geomagnetic detector, an LED warning lamp, a signal lamp, a wireless geomagnetic node information receiving and controlling device and an intelligent signal machine; according to the intelligent sensing and control system for the intersection bidirectional congestion and overflow, disclosed by the invention, an intelligent control mode which is simple in logic, intelligent in process and easy to realize can be provided for the bidirectional easy-congestion intersection under the control rule of the intelligent sensing and control system mainly according to the queuing length and overflow state data monitored in real time, the risks of bidirectional congestion and overflow and vehicle interweaving and winding at the intersection are reduced, the vehicle passing efficiency in different traffic flow directions is improved, and the intelligence of intersection signal control is improved.
Description
Technical Field
The invention belongs to the technical field of intelligent traffic control, and particularly relates to an intersection bidirectional congestion intelligent induction control system and method.
Background
Along with the rapid increase of the traffic flow of the road, the traffic jam degree of the urban road is more and more serious, the blind 'rush' phenomenon of vehicles can occur in some crossing ports in the last few seconds of the signal lamp. Particularly, at an intersection where two-way traffic flows are relatively large and relatively close to each other, the traffic flow in one direction (for example, the east-west direction) is relatively large, the queuing of the traffic flow in the direction cannot be completely released in the whole green light duration, the queuing length of the traffic flow at the next intersection reaches the intersection due to the relatively large traffic flow, and some vehicles in the east-west direction "rush into the intersection" in the last seconds of the green light or even in yellow light, and cannot pass through and overflow at the intersection. Traffic also rapidly enters the intersection after the green light signal in the other direction (e.g., north-south) begins. The 'rush into the road' of two-way traffic flow very easily causes crossing overflow phenomenon, and the multiple interweave state of violently erecting can appear in the intraoral vehicle of crossing of rushing into, causes the vehicle of two directions to interweave the winding in the mouth of crossing, and mutual not letting, two-way traffic flow all can't pass through for whole crossing's signal control is invalid, and the crossing begins two-way congestion, gets into paralysed state completely, and current efficiency reduces.
For intersections which are easy to have bidirectional congestion and overflow, along with the continuous development of monitoring equipment, monitoring technology, control algorithm and control technology in an intelligent traffic system, the intersection congestion and overflow phenomenon needs to be avoided by adopting intelligent induction and intelligent control technology so as to improve the passing efficiency of the intersections. The intelligent sensor capable of preventing the intersection bidirectional congestion overflow senses that the control system needs to monitor the state of the signal lamp and the congestion condition in the intersection in real time, and can intelligently adjust the transformation of the bidirectional signal lamp according to the monitored real-time information, and carry out full red control on the bidirectional signal lamp or carry out intervention control on the duration of the bidirectional signal lamp; the intelligent control system is required to have low reconstruction construction difficulty, small occupied area, low cost, high accuracy and high intelligent degree on the existing intersection control system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an intersection bidirectional congestion intelligent induction control system and method.
The invention is realized by the following technical scheme:
an intersection bidirectional congestion intelligent induction control system comprises a vehicle queue length geomagnetic detector, an intersection central congestion overflow geomagnetic detector, an LED warning lamp, a signal lamp, a wireless geomagnetic node information receiving and controlling device and an intelligent signal machine;
the geomagnetic detector for the vehicle queuing length comprises a geomagnetic group 1, a geomagnetic group 2, a geomagnetic group 3 and a geomagnetic group 4, wherein each geomagnetic group is arranged at an entrance of each lane after passing through an intersection;
the intersection central congestion overflow geomagnetic detector is arranged at the midpoint of an intersection grid area and is arranged at equal intervals in a matrix manner;
the LED warning lamp comprises a warning lamp group 1, a warning lamp group 2, a warning lamp group 3 and a warning lamp group 4, and each warning lamp group is arranged at a side line of an intersection grid traffic flow entering side;
the signal lamps comprise signal lamps 1, signal lamps 2, signal lamps 3 and signal lamps 4, and the signal lamps are arranged on two sides of each intersection;
the wireless geomagnetic node information receiving and controlling device is in communication connection with the vehicle queue length geomagnetic detector and the intersection central congestion overflow geomagnetic detector, and receives and processes monitoring data of the geomagnetic detector;
the intelligent signal machine is in communication connection with the wireless geomagnetic node information receiving and controlling device, receives data analysis and processing results sent by the intelligent signal machine, is in communication connection with the LED warning lamp and the signal lamp, and controls output signals of the intelligent signal machine.
In the technical scheme, the geomagnetic detector for the vehicle queue length and the geomagnetic detector for intersection central congestion overflow are both wireless geomagnetic detectors.
In the above technical solution, the number of the congestion overflow geomagnetic detectors at the center of the intersection is greater than or equal to 9.
In the technical scheme, the arrangement distance of the congestion overflow geomagnetic detectors in the center of the intersection is 1/2 of the average vehicle head distance of the vehicles in the congestion state.
In the above technical solution, the installation method of the LED warning light is as follows: the method comprises the steps of firstly pre-burying a cable pipeline, excavating a foundation pit, placing coarse sand and broken stone at the lower part of the foundation pit for draining, then installing a pre-buried shell, enabling the top to be flush with the ground, filling fine sand or cement mortar between the pre-buried shell and the foundation pit, and placing an LED lamp body after connecting the pipeline.
In the technical scheme, the wireless geomagnetic node information receiving and controlling device is installed in the signal machine or above a signal lamp post so as to be convenient for power supply and information receiving and processing.
An intersection bidirectional congestion intelligent induction control method comprises the following steps:
on the intersection, the geomagnetic detectors of vehicle queuing lengths in the north, south, east and west directions are respectively defined as a geomagnetic group 1, a geomagnetic group 2, a geomagnetic group 3 and a geomagnetic group 4, the number of congestion overflow geomagnetic detectors in the center of the intersection is 9 (more detectors can be executed according to the same logic), the geomagnetic detectors are respectively defined as a geomagnetic group 1, 2, 3, 4, 5, 6, 7, 8 and 9 in the center of the intersection, the LED warning lamps are defined as a warning lamp group 1, a warning lamp group 2, a warning lamp group 3 and a warning lamp group 4, the signal lamps are defined as a signal lamp 1, a signal lamp 2, a signal lamp 3 and a signal lamp 4, the output value of the magnetic detectors is 1 when vehicles are queued, and the output value of the magnetic detectors is 0 when no vehicles are queued;
1. when the output values of the local magnetic group 1 are all 1 and the output values of the local magnetic groups 3, 6, 9, 2, 5 and 8 in the center of the intersection are all 0, the congestion is judged from the south to the north, the warning light group 1 flickers, and the signal light 1 is controlled to be a red light;
2. if the output values of the local magnetic groups 1 are all 1 and any 4 of the output values of the local magnetic groups 3, 6, 9, 2, 5 and 8 in the center of the intersection are 1, judging that the traffic jam is serious in the north direction and overflows to the center of the intersection, normally lighting the warning lamp group 1 and controlling the signal lamp 1 to be a red lamp;
3. when the output values of the local magnetic groups 2 are all 1 and the output values of the local magnetic groups 1, 4, 7, 2, 5 and 8 in the center of the intersection are all 0, the jam from the north to the south is judged, the warning light group 2 flickers, and the signal light 2 is controlled to be a red light;
4. if the output values of the local magnetic groups 2 are all 1 and any 4 of the output values of the local magnetic groups 1, 4, 7, 2, 5 and 8 in the center of the intersection are 1, judging that the traffic jam is serious in the north direction and overflows to the center of the intersection, normally lighting the warning light group 2 and controlling the signal light 2 to be a red light;
5. when the output values of the local magnetic group 3 are all 1 and the output values of the local magnetic groups 4, 5, 6, 7, 8 and 9 at the center of the intersection are all 0, the traffic jam from the west to the east is judged, the warning light group 3 flickers, and the signal light 3 is controlled to be a red light;
6. if the output values of the local magnetic groups 3 are all 1 and any 4 of the output values of the local magnetic groups 4, 5, 6, 7, 8 and 9 in the center of the intersection are 1, judging that the road is heavily congested in the west-east direction and overflows to the center of the intersection, normally lighting the warning light group 3 and controlling the signal light 3 to be a red light;
7. when the output values of the local magnetic group 4 are all 1 and the output values of the local magnetic groups 1, 2, 3, 4, 5 and 6 at the center of the intersection are all 0, the traffic jam from east to west is judged, the warning light group 4 flickers, and the signal light 4 is controlled to be red;
8. if the output values of the local magnetic groups 4 are all 1 and any 4 of the output values of the local magnetic groups 1, 2, 3, 4, 5 and 6 in the center of the intersection are 1, judging that the traffic jam is serious from east to west and the traffic jam overflows to the center of the intersection, normally lighting the warning light group 4 and controlling the signal light 4 to be red;
9. when all the geomagnetic output values are 1, judging that the intersection is in a bidirectional severe congestion and severe overflow state, wherein 4 groups of warning lamps in 4 directions are always on, and signals in 4 directions are controlled to be all red;
10. and when all the geomagnetic output values are 0, judging that the intersection is in the non-congestion state, extinguishing all the warning lamps, and controlling according to the default signal lamp timing.
The invention has the advantages and beneficial effects that:
1. in the intelligent sensing and control system for preventing the intersection from bidirectional congestion overflow, the wireless geomagnetic detector is used for sensing and monitoring the queuing length of each traffic flow direction of the intersection and the overflow condition of the traffic flow in the intersection in real time, so that real-time sensing control data are provided for the intersection easy to jam, and intelligent control is facilitated.
2. The wireless geomagnetic detectors and the buried indicator lamps which need to be installed in the intelligent control system are limited in quantity, and the price in the market is not high. The geomagnetic detector is powered by a battery, and is mounted in a maintenance-convenient manner in a signal wireless transmission mode. The buried warning lamp can be wired by means of the existing underground line pipe at the intersection, and the installation difficulty and the modification engineering quantity are relatively low. Other equipment can be installed and reformed by means of existing signal lamps, signal machines and other infrastructure of the intersection, thereby reducing the upgrading and reforming difficulty and reducing the cost. Therefore, the present invention has: the device has the advantages of no wiring, simple installation, low cost, convenient maintenance, and accurate and reliable detection data and real-time performance.
3. According to the intelligent sensing and control system for the intersection bidirectional congestion and overflow, disclosed by the invention, an intelligent control mode which is simple in logic, intelligent in process and easy to realize can be provided for the bidirectional easy-congestion intersection under the control rule of the intelligent sensing and control system mainly according to the queuing length and overflow state data monitored in real time, the risks of bidirectional congestion and overflow and vehicle interweaving and winding at the intersection are reduced, the vehicle passing efficiency in different traffic flow directions is improved, and the intelligence of intersection signal control is improved.
Drawings
Fig. 1 is a schematic diagram of the arrangement positions of a geomagnetic detector for vehicle queuing length, a geomagnetic detector for congestion and overflow at the center of an intersection, a warning light and a signal light in the invention.
Fig. 2 is a schematic view of an installation structure of a wireless geomagnetic node information receiving and controlling device disposed on a signal lamp.
Fig. 3 is a schematic diagram of a construction and installation structure of the LED warning lamp.
Fig. 4 is a diagram illustrating a step of determining whether there is a vehicle waiting in line at the geomagnetic location.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Examples
As shown in fig. 1, an intersection bidirectional congestion intelligent induction control system comprises a vehicle queue length geomagnetic detector, an intersection central congestion overflow geomagnetic detector, an LED warning light, a signal light, a wireless geomagnetic node information receiving and controlling device and an intelligent signal machine;
the geomagnetic detector for the vehicle queuing length comprises a geomagnetic group 1, a geomagnetic group 2, a geomagnetic group 3 and a geomagnetic group 4, wherein each geomagnetic group is arranged at an entrance of each lane after passing through an intersection;
the intersection central congestion overflow geomagnetic detector is arranged at the midpoint of an intersection grid area and is arranged at equal intervals in a matrix manner;
the LED warning lamp comprises a warning lamp group 1, a warning lamp group 2, a warning lamp group 3 and a warning lamp group 4, and each warning lamp group is arranged at a side line of an intersection grid traffic flow entering side;
the signal lamps comprise signal lamps 1, signal lamps 2, signal lamps 3 and signal lamps 4, and the signal lamps are arranged on two sides of each intersection;
the wireless geomagnetic node information receiving and controlling device is in communication connection with the vehicle queue length geomagnetic detector and the intersection central congestion overflow geomagnetic detector, and receives and processes monitoring data of the geomagnetic detector;
the intelligent signal machine is in communication connection with the wireless geomagnetic node information receiving and controlling device, receives data analysis and processing results sent by the intelligent signal machine, is in communication connection with the LED warning lamp and the signal lamp, and controls output signals of the intelligent signal machine.
As shown in fig. 2, the wireless geomagnetic node information receiving and controlling device may be installed above a signal lamp post, so as to supply power and receive and process information.
As shown in fig. 3, all geomagnetic detectors are mounted in the present invention in the following manner: firstly, drilling a road surface at the installation position, wherein the diameter is more than or equal to 100mm, and the depth is more than or equal to 110 mm. Secondly, the bottom in the hole is filled with sand and paved, and the hole is required to be firm and flat. Finally, filling water and sediment into the holes, placing the holes into a geomagnetic vehicle inspection device and leveling the holes, covering the top of the geomagnetism with the seeped sediment, and paving the holes; or firstly placing the geomagnetism in the hole, leveling, pouring asphalt, and air-drying.
The reason why the wireless geomagnetic detector is selected is: the traditional induction coil detector has the advantages of simple technology and low cost, but the induction coil detector has low sensitivity for detecting vehicles and poor external interference resistance, and has low accuracy when being applied to vehicle sensing, so that the queuing length of a lane cannot be accurately obtained. The method has the advantages that the video is acquired in real time through the camera, and the queuing length and the traffic flow in the lane are obtained by utilizing the image processing technology, so that the detection precision is high, the cost is high, and meanwhile, the method is also easily influenced by light and severe weather. The wireless geomagnetic detector senses the vehicle by detecting the change of the vehicle to the geomagnetic field, and has the characteristics of no wiring, low cost, small volume, low power consumption, long service cycle, convenient installation and maintenance, high detection accuracy (more than or equal to 98%), high protection level (reaching IP68), proper detection radius (adjustable from 0 to 1.5 m), communication distance radius larger than 150m, bidirectional communication frequency of 2.45GHz, capability of detecting any vehicle type, no influence of severe environment, small influence of road surface falling leaves and rain and snow covers and the like. Therefore, the invention selects the wireless geomagnetic detector to monitor the queuing length in the lane.
According to the principle, the vehicle geomagnetic detector measures the magnetic field in the space by using a high-precision magnetoresistive sensor, and when the magnetic field change is detected, the magnetic field change data is matched and judged with a vehicle model base, so that accurate vehicle lane occupation or queuing detection is carried out. The wireless geomagnetic detector can transmit information through the built-in wireless transmission module, and can transmit information about whether vehicles are congested, overflow and occupy lanes in the middle of the vehicle queue length and the intersection to the geomagnetic node information receiving and controlling device. The geomagnetic controller can also transmit the processed information to the intelligent annunciator through the wireless module.
Detection of queuing length or parking lane occupation of wireless geomagnetic detector
The geomagnetic detector is used for judging whether vehicles stay or queue above the geomagnetic field through monitoring the change condition of the geomagnetic field, transmitting the judgment result to the receiver through wireless radio frequency, and the data receiver realizes data exchange with an upper computer system through a serial port.
The intensity of the earth magnetic field is 0.5 to 0.6 gauss, and the intensity of the earth magnetic field is constant in a region of 3-5 km. When an automobile on a certain lane passes through or stops in the magnetic field of the geomagnetic detector, the magnetic field is disturbed, the closer the automobile is to the geomagnetic detector, the larger the magnetic field variation amplitude is, and the judgment mode of whether the automobile is queued at the geomagnetic part is as shown in fig. 4. Therefore, the geomagnetic detector can judge whether the vehicle is waiting in line or not according to the detected change of the geomagnetic field strength.
The smoothing and calibration process of the magnetic field change requires data filtering, smoothing and calibration of factors affecting the oscillation frequency change, including: vehicle, climate, drift of component parameters, and the like.
The specific implementation mode is as follows: the wireless geomagnetic vehicle detector input module mainly detects sine waves with certain frequency generated by the arrival of the vehicle and judges the arrival of the vehicle by checking the sine waves; the output module is used for outputting the information to the variable lane signal machine and the variable lane indicating plate in a wireless mode by the control output circuit; communication module-communication using wireless transmission mode; the comparison and judgment module consists of a shaping amplifying circuit, a counting circuit, a frequency doubling circuit and a singlechip circuit.
Intelligent control logic of buried warning lamp
The set rule of the central geomagnetic group for detecting the overflow state of the intersection is as follows:
(1) the central geomagnetic groups 3, 6, 9, 2, and 8 detect a vehicle overflow state from the south to the north, and if any 4 or more geomagnetic output values are 1, it can be determined that the vehicle is heavily congested from the south and overflows to the center of the intersection.
(2) The central geomagnetic groups 1, 4, 7, 2, 5 and 8 detect the overflow state of the vehicles from the north to the south, and if any 4 or more geomagnetic output values are 1, the vehicles can be judged to be heavily jammed from the north to the south and overflow to the center of the intersection.
(3) The central geomagnetic groups 4, 5, 6, 7, 8 and 9 detect the overflow state of the vehicle from the west to the east, and if any 4 or more geomagnetic output values are 1, the vehicle can be judged to be heavily jammed from the west to the east and overflow to the center of the intersection.
(4) The central geomagnetic groups 1, 2, 3, 4, 5, and 6 detect a vehicle overflow state from the east to the west direction, and if any 4 or more geomagnetic output values are 1, it can be determined that the vehicle is heavily congested from the east to the west direction and overflows to the center of the intersection.
The 10 intelligent control logics and the implementation method of the underground warning lamp are shown in the table 1.
TABLE 1 Intelligent control logic for buried warning lights
3. Intelligent control logic for signal lamps in all directions
The setting rule of the central geomagnetic group for detecting the overflow state of the intersection is the same as the above. The 10 intelligent control logics and the realization method of the signal lamps in all directions designed by the invention are shown in the table 2.
TABLE 2 Intelligent control logic for directional signal lights
Through the real-time response monitoring vehicle information of lining up and the overflow information of earth magnetism detector, the control rule of burying ground warning light and signal lamp of design above the installation carries out intelligent control, both can play the warning effect and also can carry out signal intervention to blocking up, has played intelligent transportation's effect.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (7)
1. The utility model provides a two-way congestion intelligence induction control system in crossing which characterized in that: the intelligent traffic system comprises a vehicle queuing length geomagnetic detector, an intersection central congestion overflow geomagnetic detector, an LED warning lamp, a signal lamp, a wireless geomagnetic node information receiving and controlling device and an intelligent signal machine;
the geomagnetic detector for the vehicle queuing length comprises a geomagnetic group 1, a geomagnetic group 2, a geomagnetic group 3 and a geomagnetic group 4, wherein each geomagnetic group is arranged at an entrance of each lane after passing through an intersection;
the intersection central congestion overflow geomagnetic detector is arranged at the midpoint of an intersection grid area and is arranged at equal intervals in a matrix manner;
the LED warning lamp comprises a warning lamp group 1, a warning lamp group 2, a warning lamp group 3 and a warning lamp group 4, and each warning lamp group is arranged at a side line of an intersection grid traffic flow entering side;
the signal lamps comprise signal lamps 1, signal lamps 2, signal lamps 3 and signal lamps 4, and the signal lamps are arranged on two sides of each intersection;
the wireless geomagnetic node information receiving and controlling device is in communication connection with the vehicle queue length geomagnetic detector and the intersection central congestion overflow geomagnetic detector, and receives and processes monitoring data of the geomagnetic detector;
the intelligent signal machine is in communication connection with the wireless geomagnetic node information receiving and controlling device, receives data analysis and processing results sent by the intelligent signal machine, is in communication connection with the LED warning lamp and the signal lamp, and controls output signals of the intelligent signal machine.
2. The intersection bidirectional congestion intelligent induction control system according to claim 1, characterized in that: the geomagnetic detector for the vehicle queue length and the geomagnetic detector for congestion overflow at the center of the intersection are both wireless geomagnetic detectors.
3. The intersection bidirectional congestion intelligent induction control system according to claim 1, characterized in that: the number of the intersection central congestion overflow geomagnetic detectors is greater than or equal to 9.
4. The intersection bidirectional congestion intelligent induction control system according to claim 1, characterized in that: the arrangement distance of the congestion overflow geomagnetic detectors in the center of the intersection is 1/2 of the average vehicle head distance of the vehicles in the congestion state.
5. The intersection bidirectional congestion intelligent induction control system according to claim 1, characterized in that: the installation method of the LED warning lamp is as follows: the method comprises the steps of firstly pre-burying a cable pipeline, excavating a foundation pit, placing coarse sand and broken stone at the lower part of the foundation pit for draining, then installing a pre-buried shell, enabling the top to be flush with the ground, filling fine sand or cement mortar between the pre-buried shell and the foundation pit, and placing an LED lamp body after connecting the pipeline.
6. The intersection bidirectional congestion intelligent induction control system according to claim 1, characterized in that: the wireless geomagnetic node information receiving and controlling device is installed in the signal machine or above the lamp post of the signal lamp.
7. An intersection bidirectional congestion intelligent induction control method is characterized by comprising the following steps:
on the intersection, the geomagnetic detectors of vehicle queuing lengths in the north, south, east and west directions are respectively defined as a geomagnetic group 1, a geomagnetic group 2, a geomagnetic group 3 and a geomagnetic group 4, the number of congestion overflow geomagnetic detectors in the center of the intersection is 9 (more detectors can be executed according to the same logic), the geomagnetic detectors are respectively defined as a geomagnetic group 1, 2, 3, 4, 5, 6, 7, 8 and 9 in the center of the intersection, the LED warning lamps are defined as a warning lamp group 1, a warning lamp group 2, a warning lamp group 3 and a warning lamp group 4, the signal lamps are defined as a signal lamp 1, a signal lamp 2, a signal lamp 3 and a signal lamp 4, the output value of the magnetic detectors is 1 when vehicles are queued, and the output value of the magnetic detectors is 0 when no vehicles are queued;
1) when the output values of the local magnetic group 1 are all 1 and the output values of the local magnetic groups 3, 6, 9, 2, 5 and 8 in the center of the intersection are all 0, the congestion is judged from the south to the north, the warning light group 1 flickers, and the signal light 1 is controlled to be a red light;
2) if the output values of the local magnetic groups 1 are all 1 and any 4 of the output values of the local magnetic groups 3, 6, 9, 2, 5 and 8 in the center of the intersection are 1, judging that the traffic jam is serious in the north direction and overflows to the center of the intersection, normally lighting the warning lamp group 1 and controlling the signal lamp 1 to be a red lamp;
3) when the output values of the local magnetic groups 2 are all 1 and the output values of the local magnetic groups 1, 4, 7, 2, 5 and 8 in the center of the intersection are all 0, the jam from the north to the south is judged, the warning light group 2 flickers, and the signal light 2 is controlled to be a red light;
4) if the output values of the local magnetic groups 2 are all 1 and any 4 of the output values of the local magnetic groups 1, 4, 7, 2, 5 and 8 in the center of the intersection are 1, judging that the traffic jam is serious in the north direction and overflows to the center of the intersection, normally lighting the warning light group 2 and controlling the signal light 2 to be a red light;
5) when the output values of the local magnetic group 3 are all 1 and the output values of the local magnetic groups 4, 5, 6, 7, 8 and 9 at the center of the intersection are all 0, the traffic jam from the west to the east is judged, the warning light group 3 flickers, and the signal light 3 is controlled to be a red light;
6) if the output values of the local magnetic groups 3 are all 1 and any 4 of the output values of the local magnetic groups 4, 5, 6, 7, 8 and 9 in the center of the intersection are 1, judging that the road is heavily congested in the west-east direction and overflows to the center of the intersection, normally lighting the warning light group 3 and controlling the signal light 3 to be a red light;
7) when the output values of the local magnetic group 4 are all 1 and the output values of the local magnetic groups 1, 2, 3, 4, 5 and 6 at the center of the intersection are all 0, the traffic jam from east to west is judged, the warning light group 4 flickers, and the signal light 4 is controlled to be red;
8) if the output values of the local magnetic groups 4 are all 1 and any 4 of the output values of the local magnetic groups 1, 2, 3, 4, 5 and 6 in the center of the intersection are 1, judging that the traffic jam is serious from east to west and the traffic jam overflows to the center of the intersection, normally lighting the warning light group 4 and controlling the signal light 4 to be red;
9) when all the geomagnetic output values are 1, judging that the intersection is in a bidirectional severe congestion and severe overflow state, wherein 4 groups of warning lamps in 4 directions are always on, and signals in 4 directions are controlled to be all red;
10) and when all the geomagnetic output values are 0, judging that the intersection is in the non-congestion state, extinguishing all the warning lamps, and controlling according to the default signal lamp timing.
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