CN106683448B - Road signal lamp control system based on CPS and method thereof - Google Patents
Road signal lamp control system based on CPS and method thereof Download PDFInfo
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- CN106683448B CN106683448B CN201710062595.7A CN201710062595A CN106683448B CN 106683448 B CN106683448 B CN 106683448B CN 201710062595 A CN201710062595 A CN 201710062595A CN 106683448 B CN106683448 B CN 106683448B
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- 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
Abstract
The invention discloses a road signal lamp control system based on CPS and a method thereof. The system detects the traffic flow of a road by using a sensor, and collects, processes and forwards the acquired data through CPS node equipment, so that the time lengths of red lights and green lights of traffic signal lamps are adjusted and controlled in real time. The system aims to solve the problem of traffic jam caused by too long red light time and too many vehicles waiting in line when the traffic flow is large, and can exert the maximum carrying capacity of the road according to the actual condition. In addition, the system can automatically control the traffic signal lamp according to actual conditions, so that the manpower consumption is reduced, and the system is also suitable for the development trend of future intelligent traffic.
Description
Technical Field
The invention belongs to the field of intelligent traffic control of CPS technology, and relates to a road signal lamp control system and method based on CPS.
Background
As the urbanization process continues to accelerate, more and more social problems are exposed. The urban road congestion problem caused by the increasing population and the holding amount of private cars is also one of hot problems concerned by society, and particularly the problem of congestion at traffic intersections caused by rush hours on duty and night hours is a problem for people. The solution to this problem cannot be accomplished by relying solely on the force of the government or a certain business. In the modern times, the development of information technology is changing day by day, and there are many cases where information technology is used to solve practical problems in life. Therefore, the intelligent traffic signal lamp control system based on the CPS is provided and established aiming at the problem of traffic intersection road congestion and combining related information technology. As is known, the time length of a signal lamp at a traffic intersection is often fixed, which can cause that vehicles wait in a large number of queues due to unreasonable arrangement of the time length of the signal lamp during rush hour on and off duty, thereby forming road congestion.
Disclosure of Invention
The technical problem is as follows: the invention provides a CPS-based road signal lamp control system for controlling a signal lamp to meet actual requirements, and also provides a CPS-based road signal lamp control method.
The technical scheme is as follows: the invention discloses a CPS-based road signal lamp control system, which comprises:
a pressure sensor group for detecting the passage of a vehicle;
CPS node equipment connected with the pressure sensor group and used for collecting and sending information;
and the monitoring center is connected with the CPS node equipment and is used for monitoring the passing condition of road vehicles and controlling the signal lamps.
Furthermore, the pressure sensor group is laid at the outflow port and the inflow port of each lane of the crossroad, the crossroad has four driving directions from south to north, from north to south, from west to east and from east to west, each direction is respectively used for detecting the current driving direction to go straight, turn left, turn right and converge the pressure sensor of the traffic flow to form a sensor group, the pressure sensor group is connected with the CPS node equipment, the pressure sensor converts the physical deformation into an electric signal, and the electric signal is transmitted to the CPS node equipment through the serial port by A/D conversion.
Furthermore, the CPS node equipment is composed of a single chip microcomputer with data acquisition, processing and forwarding functions and peripheral equipment thereof, each pressure sensor group corresponds to one CPS node equipment, and the CPS node equipment judges signals transmitted by the pressure sensor groups, determines whether vehicles pass through or not and transmits traffic flow information to the control center.
Further, in the present invention, the CPS node device determines the signal transmitted by the pressure sensor group, and includes the following two aspects:
the CPS node equipment reads data from the pressure sensor every 10ms, and if the read data is 0, no vehicle passes through the CPS node equipment at present; when the read data is not 0, if the obtained data is the same as the previous data, the current vehicle does not completely pass, if the obtained data is not the same as the previous data, the previous vehicle passes, and at the moment, the counter is increased by 1;
and the CPS node device filters the data transmitted by the pressure sensor, ignores the data if the currently read data is not 0 but the numerical value is not in the same order of magnitude as the data generated when the motor vehicle passes, and re-reads the data from the pressure sensor, otherwise, judges that a vehicle passes.
Further, in the present invention, the tasks to be executed by the monitoring center include:
(1) visually presenting the current road passing condition of each crossroad of a city according to traffic flow information acquired by CPS node equipment at different positions;
(2) and predicting the traffic flow of other adjacent crossroads according to the traffic flow information acquired by CPS node equipment at a certain crossroad, and controlling the time length of a traffic signal lamp according to the prediction result.
Further, in the present invention, the flow of predicting the traffic flow of other crossroads adjacent to the crossroad by the monitoring center is as follows:
(1) the duration of the green light and the red light in a period from north-south direction to east-west direction is calculated by the following formula:
wherein C represents the total time of a traffic light cycle, TNSIndicating the duration of green light in a cycle, T, in the north-south traffic directionEWIndicating the duration of the green light during a cycle of the east-west traffic direction. n isN、nS、nE、nWThe flow rate of the incoming vehicle detected by the pressure sensor in each driving direction is represented;
(2) for each traffic direction, because no forbidding is set in the right turning direction, the left turning green light duration and the straight going green light duration are calculated by the following formula:
wherein T represents the green time of the current passing directionLIndicating the left-hand turn passage duration, TSIndicates the straight-through time, nL、nS、nRRespectively representThe number of left-turn, straight-run, and right-turn vehicles detected by the pressure sensor in the last traffic light cycle.
The invention discloses a CPS-based road signal lamp control method, which comprises the following steps of:
1) the pressure sensor group collects road vehicle passing data and transmits the collected data to the CPS node equipment;
2) the CPS node equipment processes the received data of the pressure sensor group to obtain passing traffic flow information and transmits the traffic flow information to the monitoring center;
3) the monitoring center synthesizes the traffic flow information collected by each intersection and predicts the traffic flow of the urban road;
4) and setting the time length of each crossroad traffic signal lamp according to the predicted result, and controlling the signal lamps.
Further, in the method of the present invention, in the step 1), the pressure sensor group is laid at the outflow port and the inflow port of each lane of the intersection, the intersection has four driving directions from south to north, from north to south, from west to east and from east to west, each direction is used for detecting the current driving direction to go straight, turn left, turn right and converge the traffic flow to form a sensor group, the pressure sensor group is connected with the CPS node device, the pressure sensor converts the physical deformation into an electrical signal, and the electrical signal is transmitted to the CPS node device through the serial port by the a/D conversion.
Further, in the method of the present invention, in step 2), the CPS node device performs the following two processing on the signal transmitted by the pressure sensor group:
the CPS node equipment reads data from the pressure sensor every 10ms, and if the read data is 0, no vehicle passes through the CPS node equipment at present; when the read data is not 0, if the obtained data is the same as the previous data, the current vehicle does not completely pass, if the obtained data is not the same as the previous data, the previous vehicle passes, and at the moment, the counter is increased by 1;
and the CPS node device filters the data transmitted by the pressure sensor, ignores the data if the currently read data is not 0 but the numerical value is not in the same order of magnitude as the data generated when the motor vehicle passes, and re-reads the data from the pressure sensor, otherwise, judges that a vehicle passes.
Further, in the method of the present invention, in the step 3), the monitoring center predicts the traffic flow of the urban road according to the following method:
(1) the transit time to the forbidden region from south to north and from north to south and from east to west and west to east in a cycle is calculated by the following formula:
wherein C represents the total time of a traffic light cycle, TNSIndicating the duration of green light in a cycle, T, in the north-south traffic directionEWIndicating the duration of the green light during a cycle of the east-west traffic direction. n isN、nS、nE、nWThe flow rate of the incoming vehicle detected by the pressure sensor in each driving direction is represented;
(2) for each traffic direction, because no forbidding is set in the right turning direction, the left turning green light duration and the straight going green light duration are calculated by the following formula:
wherein T represents the green time of the current passing directionLIndicating the left-hand turn passage duration, TSIndicates the straight-through time, nL、nS、nRIndicating the number of left-turn, straight-run, and right-turn vehicles detected by the pressure sensor in the last traffic light cycle.
And setting the time length of each intersection traffic signal lamp according to the predicted result.
The invention is superior to the traditional signal lamp control method in performance. In a traditional signal lamp control method, the duration of a signal lamp is always fixed and cannot be changed according to actual conditions, and the duration of the signal lamp is often controlled manually in traffic rush hours.
In the system, the vehicle passing condition of the road is automatically acquired through the pressure sensor, so that the automatic control of the signal lamp time length is realized according to a certain algorithm and rule. Compared with an infrared distance measuring sensor, when a plurality of vehicles pass through in a front-back staggered mode, the infrared signals are always shielded, so that the receiving end cannot receive the infrared signals of the transmitting end and mistakenly thinks that only one vehicle passes through, and therefore large errors of measurement occur. The RFID technology is not used because the chassis of each vehicle needs to be attached with an RFID tag, and the tag needs to have certain information relevance with identification equipment, so that the realization difficulty is high.
Drawings
Fig. 1 is an example of an application scenario of the present invention.
Fig. 2 is a system block diagram of the present invention.
Fig. 3 is a flow chart of data processing by the CPS node device.
Detailed Description
Referring to fig. 1, an example of an application scenario of the present invention is shown. The pressure sensor group is laid at the outflow port and the inflow port of each lane of the crossroad. The crossroad has four driving directions, namely, from south to north, from north to south, from west to east and from east to west. The pressure sensors used for detecting the straight running, left turning, right turning and vehicle flow converging of the current driving direction in each direction respectively form a sensor group.
The basic work of the CPS-based road signal lamp control system and the method thereof comprises the following steps: the pressure sensor group collects road vehicle passing data and transmits the collected data to the CPS node equipment. And the CPS node equipment receives the data of the sensor group, processes the transmission data to obtain passing traffic flow information, and transmits the traffic flow information to the monitoring center. The monitoring center synthesizes the traffic flow information collected by each intersection and predicts the traffic flow of the urban road.
Referring to FIG. 2, a system block diagram of the present invention is shown. The pressure sensor group is connected with the CPS node equipment, the pressure sensor can convert physical deformation into an electric signal, and the electric signal is transmitted to the CPS node equipment through the serial port through A/D conversion. The CPS node equipment is composed of a single chip microcomputer with data acquisition, processing and forwarding functions and peripheral equipment thereof, and each pressure sensor group corresponds to one CPS node equipment. And the CPS node equipment judges and processes the signals transmitted by the pressure sensor group and transmits the traffic flow information to the control center.
Referring to fig. 3, the CPS node device performs judgment processing on signals transmitted by the pressure sensor group, and the data processing mainly includes two aspects:
(1) the CPS node device reads data from the pressure sensor every 10 ms. If the read data is 0, no vehicle passes through the vehicle at present; when the read data is not 0, if the obtained data is the same as the last time, the current vehicle does not completely pass, and if the obtained data is not the same as the last time, the previous vehicle passes, and the counter is added with 1.
(2) The CPS node device filters data transmitted by the pressure sensor, and ignores the data when the current read data is not 0 but is smaller and is not in the same order of magnitude as the data generated when the motor vehicle passes through, and reads the data from the pressure sensor again.
In the system, the vehicle passing condition of the road is automatically acquired through a sensor, so that the automatic control of the signal lamp time length is realized according to a certain algorithm and rule. When the traffic flow is large, the system can properly prolong the duration of the green light, so that the vehicle can rapidly pass through the system, and overstock is avoided; if the road traffic pressure is not great, the system can increase the duration of the red light appropriately to relieve the road traffic pressure in other traffic directions. According to the actual road traffic condition, the intelligent control of the signal lamp is realized, so that the maximum carrying capacity of the road is exerted.
The above examples are only preferred embodiments of the present invention, it should be noted that: it will be apparent to those skilled in the art that various modifications and equivalents can be made without departing from the spirit of the invention, and it is intended that all such modifications and equivalents fall within the scope of the invention as defined in the claims.
Claims (7)
1. A CPS-based road signal lamp control system, comprising:
a pressure sensor group for detecting the passage of a vehicle;
CPS node equipment connected with the pressure sensor group and used for collecting and sending information;
the monitoring center is connected with the CPS node equipment and is used for monitoring the passing condition of road vehicles and controlling signal lamps;
the tasks to be executed by the monitoring center comprise:
(1) visually presenting the current road passing condition of each crossroad of a city according to traffic flow information acquired by CPS node equipment at different positions;
(2) predicting the traffic flow of other adjacent crossroads according to the traffic flow information acquired by CPS node equipment of a certain crossroad, and controlling the time length of a traffic signal lamp according to the prediction result;
the flow of the monitoring center for predicting the traffic flow of other crossroads adjacent to the crossroad is as follows:
(1) the duration of the green light and the red light in a period from north-south direction to east-west direction is calculated by the following formula:
wherein C represents the total time of a traffic light cycle, TNSIndicating the duration of green light in a cycle, T, in the north-south traffic directionEWIndicating the duration of a green light in a cycle of the east-west traffic direction, nN、nS、nE、nWThe flow rate of the incoming vehicle detected by the pressure sensor in each driving direction is represented;
(2) for each traffic direction, because no forbidding is set in the right turning direction, the left turning green light duration and the straight going green light duration are calculated by the following formula:
wherein T represents the green time of the current passing directionLIndicating the left-hand turn passage duration, TSIndicates the straight-through time, nL、nS、nRRespectively representing the number of left-turning, straight-going and right-turning vehicles detected by the pressure sensor in the last traffic light period.
2. The CPS-based road signal lamp control system and method as claimed in claim 1, wherein the pressure sensor group is laid at the outflow and inflow ports of each lane of the intersection, the intersection has four driving directions from south to north, north to south, west to east and east to west, each direction is used to detect the current driving direction to go straight, turn left, turn right and converge the traffic flow to form a sensor group, the pressure sensor group is connected to the CPS node device, the pressure sensor converts the physical deformation into an electrical signal, and the electrical signal is transmitted to the CPS node device through the serial port by a/D conversion.
3. The CPS-based road signal lamp control system as claimed in claim 1 or 2, wherein the CPS node devices are composed of a single chip microcomputer with data acquisition, processing and forwarding functions and peripheral devices thereof, each pressure sensor group corresponds to one CPS node device, and the CPS node devices judge signals transmitted by the pressure sensor groups, confirm whether vehicles pass through or not, and transmit traffic flow information to the control center.
4. The CPS-based road signal lamp control system as claimed in claim 3, wherein the CPS node device determines the signal transmitted by the pressure sensor group, including the following two aspects:
the CPS node equipment reads data from the pressure sensor every 10ms, and if the read data is 0, no vehicle passes through the CPS node equipment at present; when the read data is not 0, if the obtained data is the same as the previous data, the current vehicle does not completely pass, if the obtained data is not the same as the previous data, the previous vehicle passes, and at the moment, the counter is increased by 1;
and the CPS node device filters the data transmitted by the pressure sensor, ignores the data if the currently read data is not 0 but the numerical value is not in the same order of magnitude as the data generated when the motor vehicle passes, and re-reads the data from the pressure sensor, otherwise, judges that a vehicle passes.
5. A road signal lamp control method based on CPS is characterized by comprising the following steps:
1) the pressure sensor group collects road vehicle passing data and transmits the collected data to the CPS node equipment;
2) the CPS node equipment processes the received data of the pressure sensor group to obtain passing traffic flow information and transmits the traffic flow information to the monitoring center;
3) the monitoring center synthesizes the traffic flow information collected by each intersection, and predicts the traffic flow of the urban road according to the following modes:
(1) the transit time to the forbidden region from south to north and from north to south and from east to west and west to east in a cycle is calculated by the following formula:
wherein C represents the total time of a traffic light cycle, TNSIndicating the duration of green light in a cycle, T, in the north-south traffic directionEWIndicating the duration of a green light in a cycle of the east-west traffic direction, nN、nS、nE、nWIndicating sinks detected by pressure sensors in each direction of travelThe traffic flow rate;
(2) for each traffic direction, because no forbidding is set in the right turning direction, the left turning green light duration and the straight going green light duration are calculated by the following formula:
wherein T represents the green time of the current passing directionLIndicating the left-hand turn passage duration, TSIndicates the straight-through time, nL、nS、nRIndicating the number of left-turn, straight-run and right-turn vehicles detected by the pressure sensor in the last traffic light period;
4) and setting the time length of each crossroad traffic signal lamp according to the predicted result, and controlling the signal lamps.
6. The CPS-based road signal lamp control method as claimed in claim 5, wherein in step 1), the pressure sensor group is laid at the outflow port and inflow port of each lane of the intersection, the intersection has four driving directions from south to north, north to south, west to east and east to west, each direction is used to detect the current driving direction to go straight, turn left, turn right and converge the traffic flow to form a sensor group, the pressure sensor group is connected to the CPS node device, the pressure sensor converts the physical deformation into an electrical signal, and the electrical signal is transmitted to the CPS node device through the serial port by a/D conversion.
7. The CPS-based road signal lamp control method as claimed in claim 5, wherein in the step 2), the CPS node device performs the following two processes on the signal transmitted by the pressure sensor group:
the CPS node equipment reads data from the pressure sensor every 10ms, and if the read data is 0, no vehicle passes through the CPS node equipment at present; when the read data is not 0, if the obtained data is the same as the previous data, the current vehicle does not completely pass, if the obtained data is not the same as the previous data, the previous vehicle passes, and at the moment, the counter is increased by 1;
and the CPS node device filters the data transmitted by the pressure sensor, ignores the data if the currently read data is not 0 but the numerical value is not in the same order of magnitude as the data generated when the motor vehicle passes, and re-reads the data from the pressure sensor, otherwise, judges that a vehicle passes.
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| CN107945543B (en) * | 2017-12-12 | 2020-10-27 | 常州大学 | Method for accurately calculating green light time period based on artificial intelligence |
| CN110556000A (en) * | 2018-06-04 | 2019-12-10 | 义硕智能股份有限公司 | Artificial intelligence traffic detection system |
| CN111681428B (en) * | 2020-06-05 | 2023-03-28 | 阿波罗智联(北京)科技有限公司 | Overflow detection method and device, electronic equipment and storage medium |
| CN112037543A (en) * | 2020-09-14 | 2020-12-04 | 中德（珠海）人工智能研究院有限公司 | Urban traffic light control method, device, equipment and medium based on three-dimensional modeling |
| CN114220280B (en) * | 2021-12-12 | 2023-10-13 | 李会江 | Controllable traffic signal lamp for man and vehicle |
| CN115083160A (en) * | 2022-06-15 | 2022-09-20 | 国汽智控(北京)科技有限公司 | Signal lamp control method and device and signal lamp controller |
| CN116189463B (en) * | 2023-01-31 | 2023-09-26 | 华南理工大学 | Single intersection signal timing scheme rolling optimization method based on information physical system |
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