CN110533915B - Intelligent monitoring method and system for preventing traffic jam on expressway - Google Patents
Intelligent monitoring method and system for preventing traffic jam on expressway Download PDFInfo
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- CN110533915B CN110533915B CN201910899986.3A CN201910899986A CN110533915B CN 110533915 B CN110533915 B CN 110533915B CN 201910899986 A CN201910899986 A CN 201910899986A CN 110533915 B CN110533915 B CN 110533915B
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
- G08G1/0145—Measuring and analyzing of parameters relative to traffic conditions for specific applications for active traffic flow control
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/065—Traffic control systems for road vehicles by counting the vehicles in a section of the road or in a parking area, i.e. comparing incoming count with outgoing count
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
Abstract
The invention discloses an intelligent monitoring method and system for preventing traffic jam on a highway. The invention relates to an intelligent monitoring method for preventing traffic jam on a highway, which comprises the following steps: s11, acquiring the number of vehicles in each section of the highway; s12, judging whether the number of the acquired vehicles in each section is smaller than or equal to a first threshold value, and if not, executing a step S13; s13, acquiring the number of vehicles in a rear section adjacent to the current section, judging whether the acquired number of the vehicles in the rear section is 0 or not, and if not, executing the step S14; s14, acquiring the average speed of the current interval and the average speed of the rear interval, judging whether the average speed of the current interval is greater than or equal to the average speed of the rear interval or not, and if not, executing a step S15; s15, sending an acceleration command to the monitoring device in the current interval, sending a deceleration command to the monitoring device in the rear interval, and receiving execution results sent by the monitoring device in the current interval and the monitoring device in the rear interval; and S16, storing the execution result.
Description
Technical Field
The invention relates to the technical field of traffic management, in particular to an intelligent monitoring method and system for preventing traffic jam on a highway.
Background
The rapid development of the expressway and the large-scale primary molding of the expressway network really bring convenience and quickness for the people to go out. However, the congestion of the highway frequently occurs, which greatly reduces the superiority of the highway in 'fast clear', and also provides a serious challenge for the traffic safety management work of the highway.
Causes of highway traffic congestion include the following:
1. traffic jam caused by traffic accidents. The accident caused by single or multiple vehicle collision, especially the accident caused by large or heavy vehicle, can result in the accident vehicle occupying the great road surface or whole road surface of the highway, and the traffic jam. Some traffic accidents can cause serious consequences such as leakage and explosion of vehicles or dangerous chemicals, and cause traffic interruption or form traffic bottlenecks, thereby causing serious congestion.
2. Traffic congestion caused by bad weather. The ice-snow day and the fog day have great influence on traffic, the ice-snow day is easy to cause the road surface of the expressway to be iced, particularly, the bridge of the expressway is easy to be iced, and running vehicles are easy to slip and cannot normally and safely pass. Fog weather causes reduced visibility over large areas and long distances on highways, and vehicles already traveling on highways have to reduce their speed, causing congestion. In addition, traffic accidents are often caused by ice, snow and fog weather, even secondary accidents or tail forcing of multiple vehicles are often caused, and severe highway blockage is caused.
3. Traffic jam caused by road construction operation. The rapid increase of traffic volume generally causes the heavy burden of the highway, the fatigue of the road surface is accelerated, the aging is advanced, the highway operation and management unit needs to maintain, transform and upgrade the damaged road or other facilities and needs to occupy a certain lane, so that the lane becomes narrow, the speed of the vehicle is reduced, and the traffic jam is caused.
4. Traffic congestion caused by a surge in traffic volume. The rapid increase of the traffic flow becomes the most direct factor of congestion, along with the continuous and rapid development of the economic society of China, the motor vehicles grow rapidly, particularly after the country implements a freeway holiday free policy, the traffic flow during holidays is increased rapidly and far exceeds the design flow of the expressway at first, and the traffic congestion is easily caused after the traffic flow reaches a saturated state.
5. More severe congestion due to human factors. The traffic accident or other reasons are that the driver does not obey the traffic rules, the cracks are disordered when seeing the cracks, and the water cannot be drained when the rescue channel at the very least is blocked, so that the traffic accident is not conducive to traffic dispersion, the collision and scraping are easy to happen, and the work is more difficult to recover the traffic for a longer time.
Therefore, the congestion of the expressway brings time loss to people, and whether the congestion occurs on the road section is informed by vehicle-mounted GPS navigation equipment through (1); (2) vehicle radio notification; (3) display screen on the highway, broadcast, etc. These existing notification methods are based on a prompt made after congestion has occurred. Therefore, there is no method and system for actively avoiding congestion, that is, whether congestion will occur is predicted through active monitoring, and a prompt is made in advance, so that the probability of congestion occurrence is reduced. Therefore, the invention provides an intelligent monitoring method and system for preventing traffic jam on a highway.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an intelligent monitoring method and system for preventing traffic jam on an expressway, so that the road jam on the expressway can be actively avoided.
In order to achieve the purpose, the invention adopts the following technical scheme:
an intelligent monitoring method for preventing traffic jam on a highway comprises the following steps:
s1, acquiring the number of vehicles in each section of a highway; monitoring devices are arranged in all sections of the expressway;
s2, judging whether the number of the acquired vehicles in each section is smaller than or equal to a first threshold value, if so, executing a step S1; if not, go to step S3;
s3, acquiring the number of vehicles in a rear section adjacent to the current section, judging whether the acquired number of the vehicles in the rear section is 0 or not, and if yes, executing a step S6; if not, go to step S4; wherein the rear section is a section opposite to the vehicle running direction;
s4, acquiring the average speed of the current interval and the average speed of the rear interval, judging whether the average speed of the current interval is greater than or equal to the average speed of the rear interval or not, and if so, executing a step S6; if not, go to step S5;
s5, sending an acceleration command to the monitoring device in the current interval, sending a deceleration command to the monitoring device in the rear interval, and receiving execution results sent by the monitoring device in the current interval and the monitoring device in the rear interval;
and S6, storing the execution result.
Further, step S4 is preceded by:
a countdown timer is started.
Furthermore, the monitoring device comprises at least one first sensor, at least one second sensor, a radio frequency communication module, a microprocessor and a networking module; the first sensor is used for detecting whether a vehicle enters a current interval or not, and the second sensor is used for detecting whether the vehicle leaves the current interval or not.
Further, the step S4 includes:
s41, sending a command for acquiring the average speed of the vehicles in the current interval and the average speed of the vehicles in the rear interval to the monitoring device in the current interval and the monitoring device in the rear interval respectively;
s42, a microprocessor in the monitoring device of the current interval sends a speed command for acquiring all vehicles in the current interval through a radio frequency communication module, and calculates to obtain the average speed of the vehicles in the current interval; a microprocessor in the monitoring device of the rear interval sends and acquires speed commands of all vehicles in the rear interval through a radio frequency communication module, and calculates to obtain the average speed of the vehicles in the rear interval;
and S43, receiving the average speed calculated by the monitoring device in the current interval and the rear interval.
Further, the step S5 includes:
s51, the microprocessor of the current interval monitoring device sends a speed acquisition command to all vehicles in the current interval range through the radio frequency communication module;
s52, a microprocessor of the current interval monitoring device obtains vehicles with the current interval lower than the average speed through screening, and sends a prompt command to the vehicles with the current interval lower than the average speed through a radio frequency communication module; the prompt command is an acceleration command;
and S53, the microprocessor of the current interval monitoring device sends a vehicle speed command for acquiring the vehicle with the current interval lower than the average vehicle speed through the radio frequency communication module and generates an acquisition result.
Further, the step S5 further includes:
s54, the microprocessor of the rear interval monitoring device sends a vehicle speed acquisition command to all vehicles in the rear interval range through the radio frequency communication module;
s55, a microprocessor of the rear interval monitoring device obtains vehicles with rear intervals higher than the average speed through screening, and sends prompt commands to the vehicles with the rear intervals higher than the average speed through a radio frequency communication module; the prompt command is a deceleration command;
and S56, the microprocessor of the rear interval monitoring device sends a vehicle speed command for acquiring the vehicle with the rear interval higher than the average vehicle speed through the radio frequency communication module and generates an acquisition result.
Further, the step S1 includes:
s11, the first sensor acquires the number of vehicles entering a current interval, the second sensor acquires the number of vehicles leaving the current interval, and an acquisition result is sent to the microprocessor;
and S12, the microprocessor receives and processes the obtained result to obtain the number of the vehicles in the current interval.
Further, the vehicle-mounted device is arranged in the vehicle; the vehicle-mounted device is in two-way communication with the radio frequency communication module.
Further, the vehicle-mounted device comprises a license plate and a vehicle type of the vehicle.
Correspondingly, an intelligent monitoring system for preventing the traffic jam of the expressway is also provided, and the intelligent monitoring method for preventing the traffic jam of the expressway is based on the intelligent monitoring system.
Compared with the prior art, the method and the device have the advantages that whether congestion will occur or not is judged in advance through active monitoring, and advance prompt is achieved, so that the probability of congestion is reduced.
Drawings
FIG. 1 is a flowchart of an intelligent monitoring method for preventing traffic congestion on a highway according to an embodiment;
FIG. 2 is a schematic diagram of a top view of a highway section provided in accordance with an embodiment;
FIG. 3 is a schematic illustration of a section of a highway section according to an embodiment;
FIG. 4 is a schematic view of a monitoring device according to an embodiment;
FIG. 5 is a schematic diagram of signal transmission of a radio frequency communication module according to an embodiment;
fig. 6 is a schematic diagram of RSSI velocity measurement provided in the second embodiment;
fig. 7 is a structural diagram of an intelligent monitoring system for preventing traffic congestion on a highway according to a third embodiment.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The invention aims to provide an intelligent monitoring method and system for preventing traffic jam on a highway, aiming at the defects of the prior art.
Example one
The intelligent monitoring method for preventing traffic jam on the highway provided by the embodiment of the invention, as shown in fig. 1, includes the steps of:
s11, acquiring the number of vehicles in each section of the highway; monitoring devices are arranged in all sections of the expressway;
s12, judging whether the number of the acquired vehicles in each section is smaller than or equal to a first threshold value, if so, executing a step S11; if not, go to step S13;
s13, acquiring the number of vehicles in a rear section adjacent to the current section, judging whether the acquired number of the vehicles in the rear section is 0 or not, and if yes, executing a step S16; if not, go to step S14; wherein the rear section is a section opposite to the vehicle running direction;
s14, acquiring the average speed of the current interval and the average speed of the rear interval, judging whether the average speed of the current interval is greater than or equal to the average speed of the rear interval or not, and if so, executing a step S16; if not, go to step S15;
s15, sending an acceleration command to the monitoring device in the current interval, sending a deceleration command to the monitoring device in the rear interval, and receiving execution results sent by the monitoring device in the current interval and the monitoring device in the rear interval;
and S16, storing the execution result.
In the embodiment, the monitoring system comprises a server and a monitoring device; the monitoring device comprises a plurality of sensors, a radio frequency communication module, a microprocessor and a networking module; the system comprises a plurality of sensors, a control unit and a control unit, wherein the sensors are arranged under the road surface of a highway lane and used for detecting the number of vehicles entering or leaving a current section; the radio frequency communication module is used for carrying out bidirectional communication with the vehicle in the current interval; the microprocessor is used for processing the information received by the monitoring device; and the networking module is connected with the server and is used for communicating the server with the monitoring device.
As shown in fig. 2-4, the running direction of the vehicle C1 is set to run from left to right, and a certain highway is provided with a passing lane, a traffic lane and an emergency lane, and for this example, the selected highway section is divided into N sections at equal intervals, each section is called a section, it should be noted that the sections of the embodiment are continuous, and a set of monitoring devices is arranged in each section.
In the present embodiment, a passing lane and a traffic lane are taken as an example to be specifically described, and a certain section is represented by RiIt is shown that,wherein i is more than or equal to 1, and the monitoring device is composed of a microprocessor, a plurality of sensors, a radio frequency communication module and a networking module.
In the present embodiment, the current interval RiThe system comprises at least one first sensor and at least one second sensor, wherein the first sensor is positioned on one side of the current interval, and the second sensor is positioned on the other side of the current interval; the first sensor is used for detecting whether a vehicle enters the current interval, and the second sensor is used for detecting whether the vehicle leaves the current interval.
Specifically, a geomagnetic sensor is laid under the surface of each lane (passing lane, traffic lane, no emergency lane) in each section, wherein: sensor Si_1Is arranged in the interval RiLeft boundary overtaking lane, sensor Si_2Is arranged in the interval RiLeft boundary lane, sensor Si_3Is arranged in the interval RiRight boundary overtaking lane, sensor Si_4Is arranged in the interval RiThe right border the traffic lane.
Will Si_1、Si_2Referred to as first sensor, the purpose of which is to detect whether there is a vehicle entering the section Ri(ii) a Will Si_3、Si_4Referred to as a second sensor, the purpose of which is to detect whether there is a section R where the vehicle leavesi。
It should be noted that, when a vehicle passes through the geomagnetic sensor, the signal output of the geomagnetic sensor obviously changes compared with the signal output of the geomagnetic sensor without the vehicle, and therefore, it is not necessary to consider whether the geomagnetic sensor is an analog output or a digital output.
In the present embodiment, the first sensor detects whether there is a vehicle entering the section RiAnd simultaneously detecting whether the vehicle leaves the section R or noti-1I.e. the first sensor and the current interval RiThe microprocessor of the middle monitoring device is connected with the rear interval Ri-1The microprocessor of the monitoring device is connected. Similarly, the second sensor detects whether there is a vehicle leaving zone RiAnd simultaneously detecting whether a vehicle enters the section Ri+1(not shown in the figure), i.e. the second sensor and the current interval RiThe microprocessor of the middle monitoring device is connected with the front sectionRi+1The microprocessor of the monitoring device is connected.
Assuming that the distance between the first and second sensors is L, the section R is considered based on the distance L, the average length of the vehicles, the safe following distance to be maintained between the vehicles during driving (assuming that L is greater than the safe distance), and other factors, and when normal driving (no traffic jam) can be estimatediNumber of vehicles K in. For example, if the distance L is 1000m, the safe driving distance is 100m, and the average length of the vehicle is 5m, the interval R isiThe number K of the internally unblocked vehicles is as follows: 2 × 1000/105 (passing lane, traffic lane, 2 lanes total), about 19 vehicles.
In this embodiment, the radio frequency communication module is disposed on the support having a certain height from the ground, and is located between the first sensor and the second sensor, and is in bidirectional communication with the vehicle in the current zone.
Specifically, the radio frequency communication module may be a common short-range wireless communication module in ISM frequency bands such as 433, 315 MHz. The radio frequency communication module is arranged on a bracket with a certain height from the ground, so that the radio frequency communication module is positioned at the central point of the interval, namely, the distances from the first sensor to the second sensor are respectively equal. As shown in fig. 3, the communication distance of the rf communication module is controlled to just cover the region RiPreferably, the boundary determined for the first and second sensors in the horizontal direction is shown by any dashed line a in fig. 3.
In this embodiment, since the signal transmission of the rf communication module is omnidirectional and the interval is continuous, when the vehicle is located at the left and right boundaries of the interval, it is possible to receive the data transmitted by two adjacent monitoring devices. The method for solving the problem is as follows: the command sent by the monitoring device contains the information of the monitoring device, namely, the number of the monitoring devices, and the information of the monitoring device is analyzed after the vehicle-mounted device receives the command.
In this embodiment, the signal transmission of the rf communication module may also be in a horn shape, as shown in fig. 5, the rf communication module transmits downward from a high position of the bracket in a horn shape (signal coverage) (in a broadcast manner, without screening and receiving the identity information of the vehicle), and at this time, a corresponding directional transmitting antenna is needed to cooperate with the vehicle for bidirectional communication.
It should be noted that the signal transmission of the radio frequency communication module of the present embodiment can be selected according to actual situations.
In the embodiment, the vehicle-mounted device is further included, and the vehicle-mounted device is arranged in the vehicle; the radio frequency communication module is in bidirectional communication with a vehicle-mounted device arranged in the vehicle through the radio frequency communication module.
Specifically, when the vehicle enters the high-speed entrance, the vehicle-mounted device is picked up, and the vehicle-mounted device can be manually or automatically bound and associated with the license plate number and the vehicle type. The vehicle-mounted device is also internally provided with a speed measurement sensor, a second radio frequency communication module, an acousto-optic vibration module and other modules, wherein the second radio frequency communication module and the interval RiThe radio frequency communication module of the monitoring device performs bidirectional wireless communication and is initially in a receiving state. When the vehicle leaves the high speed, the vehicle-mounted device is retracted.
In this embodiment, the microprocessor is used to process the information received by the monitoring device.
Such as handling the number of vehicles for which several sensors detect the current zone.
Specifically, the first sensor sends the number of the vehicles which are detected to enter the current interval to the microprocessor, the second sensor sends the number of the vehicles which are detected to leave the current interval to the microprocessor, and the microprocessor receives the number of the vehicles sent by the first sensor and the second sensor and obtains the number of the vehicles in the current interval through calculation. Such as: under the initial condition, if the first sensor and the second sensor can not sense the vehicle within a set enough time, resetting is carried out, namely the number N of the vehicles in the interval is orderedi0; if the first sensor senses that the vehicle enters the region RiThen N isi＝Ni+ 1; the second sensor senses that the vehicle leaves RiThen N isi＝Ni-1. By entering the current interval RiNumber of vehicles and departure from the current range RiThe number of vehicles in the current interval R is calculatediThe number of vehicles.
In this embodiment, the networking module establishes a connection with the server for the server to communicate with the monitoring device.
Specifically, the monitoring devices in all the intervals are networked in a wired (such as 485) or wireless (such as mobile communication public network, 4G) mode, and the monitoring devices are connected with the server.
In step S11, the number of vehicles in each section of the highway is acquired.
Step S11 includes:
s111, the first sensor acquires the number of vehicles entering a current interval, the second sensor acquires the number of vehicles leaving the current interval, and an acquisition result is sent to the microprocessor;
and S112, receiving and processing the obtained result by the microprocessor to obtain the number of the vehicles in the current interval.
The server sends a command for acquiring the number of vehicles to all the monitoring devices, each monitoring device executes the command after receiving the command, then responses to the server, and the server receives the responses of each monitoring device.
In the embodiment, the number of vehicles in each section is acquired by detecting the number of vehicles entering each section by the first sensor, detecting the number of vehicles leaving each section by the second sensor, and sending the detected number of vehicles to the microprocessor; the microprocessor of the monitoring device calculates the number of vehicles in each section by detecting the number of vehicles entering each section and the number of vehicles leaving each section, and sends the number of vehicles in each section to the server.
In this embodiment, if the first sensor senses that a vehicle enters each zone, N isi＝Ni+ 1; if the second sensor senses that the vehicle leaves in each interval, N isi＝Ni-1。
In step S12, it is determined whether or not the number of vehicles in each acquired section is equal to or less than the first threshold value, and if so, step S11 is executed; if not, step S13 is executed.
The server judges whether the number of vehicles in all the sections is less than or equal to a first threshold value K, if not, S13 is executed; if yes, go to step S11.
It should be noted that the present embodiment assumes the interval RiIs greater than the first threshold K. Occurrence interval RiThe reason why the number of vehicles of (1) is larger than the first threshold value K is that: entering the interval R within a set timeiThe number of vehicles is greater than the departure section RiThe number of vehicles (2) is, in terms of the whole and dynamics, that is, the entering section RiIs greater than the leaving interval RiThe average vehicle speed of the vehicle.
Before step S13, the method further includes the steps of:
the server starts a first countdown timer;
the purpose of starting the first countdown timer is to enable the number of vehicles to be less than or equal to K and reserve adjustment time.
Step S13 is preceded by the step of:
the server sends a control command to the interval RiInterval RiThe monitoring device executes the command after receiving the command, then replies to the server, and the server receives the interval RiAfter the response, the first record table is saved/refreshed.
Specifically, the microprocessor of the monitoring device sends a vehicle speed acquisition command to the current region R through the radio frequency communication moduleiAll vehicles within the range then wait for the reply of the receiving vehicle to obtain the current interval RiAnd (4) solving the average speed of each vehicle license plate, each vehicle type and the corresponding speed, and screening out the vehicles with the speed lower than the average speed.
The method comprises the steps that the vehicle speed of a vehicle is acquired by a vehicle-mounted device arranged in the vehicle, specifically, a speed measuring sensor of the vehicle-mounted device acquires the running speed of the vehicle in real time, the acquired running speed is communicated with a radio frequency communication module of the monitoring device through a second radio frequency communication module of the vehicle-mounted device and is sent to a microprocessor, and the microprocessor further acquires the acquired current interval RiIs added and divided by the vehicle speed in the current range RiThe number of vehicles, and finally obtaining the current intervalRiAverage vehicle speed of the vehicle.
The microprocessor of the monitoring device sends a prompt command to screened vehicles with the speed lower than the average speed through the radio frequency communication module, so that the vehicles with the speed lower than the average speed are accelerated to the average speed value, and after the vehicles with the speed lower than the average speed are received, on one hand, the sound-light vibration module of the vehicle-mounted device prompts a driver to strictly execute the command, and the vehicles are accelerated to the normal value. If the current running speed is lower than 80km/h, please accelerate the running, otherwise, corresponding punishment measures are accepted through voice broadcasting; on the other hand, the vehicle-mounted device sends the response signal to the monitoring device through the radio frequency communication module to inform the monitoring device that the information is received, and the radio frequency communication module delays the set time after receiving the response, wherein the delay is to reserve a certain acceleration time for the vehicle.
A microprocessor of the monitoring device sends a vehicle speed acquisition command to screened vehicles with the speed lower than the average vehicle speed through a radio frequency communication module, waits for receiving the reply of the vehicles, finally obtains the respective vehicle speeds of the vehicles with the speed lower than the average vehicle speed, judges whether the vehicle speed of one vehicle is lower than the average vehicle speed, and generates vehicle information with the speed lower than the average vehicle speed and a first recording table of the corresponding real-time vehicle speed if the vehicle speed of one vehicle is lower than the average vehicle speed, wherein the vehicle information comprises a license plate and a vehicle type; if not, the first record table is marked as no record (blank record table). And finally, sending the first record table to a server.
Before step S13, the method further includes the steps of:
the server sends a command for acquiring the number of vehicles to the section RiIs arranged in the interval RiThe monitoring device returns the number of the vehicles to the server, and the server judges the interval R according to the received resultiWhether the number of vehicles is less than or equal to a first threshold value K;
if the interval R isiIf the number of vehicles is less than or equal to the first threshold value K, judging whether the countdown value of the first countdown timer is equal to 0, if not, stopping the timer and resetting, and then executing the step S16; if equal to 0, go to step S16.
Interval RiThe number of vehicles is less than or equal to a first thresholdThe value K indicates that all vehicles with a speed lower than the average speed have accelerated as commanded and the congestion has resolved.
If the interval R isiIf the number of vehicles is larger than a first threshold value K, whether the countdown value of the first countdown timer is equal to 0 or not is judged, if not, the server continues to send a control command to the interval RiA step (2); if equal to 0, go to step S13.
Interval RiThe presence of a number of vehicles greater than the first threshold K indicates that there are vehicles with a speed below the average speed that are not accelerating on command. The possibilities that exist include: 1. not listening to the command; 2. vehicle failure/accident, where the congestion is not resolved.
In step S13, the number of vehicles in the rear section adjacent to the current section is acquired, and it is determined whether the acquired number of vehicles in the rear section is 0, if yes, step S16 is executed; if not, go to step S14; the rear section is a section opposite to the vehicle traveling direction.
Specifically, the server sends a command for acquiring the number of vehicles to the rear section Ri-1(reverse direction of vehicle travel), section Ri-1The monitoring device executes the command, then responds to the server, and the server judges the rear section Ri-1Whether the current vehicle number is equal to 0 (i.e., no vehicle), if yes, executing step S16; if not, step S14 is executed.
Before step S14, the method further includes the steps of:
a countdown timer is started (this countdown timer is referred to as a second countdown timer in order to be distinguished from the first countdown timer).
The purpose of starting the second countdown timer is to allow the vehicle to adjust the vehicle speed for an adjusted time.
In step S14, the average speed of the current section and the rear section is obtained, and it is determined whether the average speed of the current section is equal to or greater than the average speed of the rear section, if yes, step S16 is executed; if not, step S15 is executed.
The step S14 includes:
s141, sending a command for acquiring the average speed of the vehicles in the current interval and the average speed of the vehicles in the rear interval to the monitoring device in the current interval and the monitoring device in the rear interval respectively;
s142, a microprocessor in the monitoring device of the current interval sends a command for acquiring the speed of all vehicles in the current interval through a radio frequency communication module, and calculates to obtain the average speed of the vehicles in the current interval; a microprocessor in the monitoring device of the rear interval sends and acquires speed commands of all vehicles in the rear interval through a radio frequency communication module, and calculates to obtain the average speed of the vehicles in the rear interval;
and S143, receiving the average speed calculated by the monitoring device in the current interval and the rear interval.
Specifically, the server sends an average speed obtaining command to the interval RiAnd the interval Ri-1Interval RiAnd the interval Ri-1The monitoring device(s) executes the command and then responds to the server which compares the two average speeds obtained and compares the interval RiIs recorded as ViAnd the interval Ri-1Is recorded as Vi-1Judgment of ViWhether or not V is greater than or equal toi-1。
In the present embodiment, the average speed of the vehicle in the current section and the rear section and the calculation section R are calculatediThe average speed is similar, and will not be described herein.
If ViGreater than or equal to Vi-1If yes, determining whether the countdown value of the second countdown timer is equal to 0, if not, stopping the second countdown timer and resetting, and then executing step S16; if equal to 0, go to step S16.
If ViLess than Vi-1If yes, determining whether the countdown value of the second countdown timer is equal to 0, and if not, performing step S15; if equal to 0, go to step S16.
In step S15, an acceleration command is transmitted to the monitoring device in the current zone, a deceleration command is transmitted to the monitoring device in the rear zone, and the execution results transmitted from the monitoring device in the current zone and the monitoring device in the rear zone are received.
Server send addSpeed command to interval RiMonitoring device, sending deceleration command to interval Ri-1Monitoring device of (1), interval RiAnd the interval Ri-1The monitoring device executes the command and then responds to the server, and the server refreshes the second record list after receiving the command.
In this embodiment, the acquiring the execution acceleration command specifically includes:
s151, a microprocessor of the current interval monitoring device sends a speed acquisition command to all vehicles in the current interval range through a radio frequency communication module;
interval RiThe microprocessor of the monitoring device sends a vehicle speed acquisition command to the current region R through the radio frequency communication moduleiAll vehicles within the range then wait for the reply of the receiving vehicle to obtain the current interval RiThe license plate, the model and the corresponding speed of each vehicle are screened out, and the speed lower than V is screened outi-1The vehicle of (1).
S152, the microprocessor of the current interval monitoring device obtains that the current interval is lower than V through screeningi-1And sending a prompt command to the vehicle through the radio frequency communication module, wherein the current interval is lower than Vi-1The vehicle of (1); the prompt command is an acceleration command.
Interval RiThe microprocessor of the monitoring device sends a prompt command to the screened lower V through the radio frequency communication modulei-1By accelerating them to V or morei-1Below Vi-1After the vehicle receives the command, on one hand, the driver is prompted to strictly execute the command through an acousto-optic vibration module of the vehicle-mounted device, and the vehicle is accelerated to a normal value. If the current running speed is lower than 80km/h, please accelerate the running, otherwise, corresponding punishment measures are accepted through voice broadcasting; on the other hand, the vehicle-mounted device sends the response signal to the monitoring device through the radio frequency communication module to inform the monitoring device that the information is received, and the radio frequency communication module delays the set time after receiving the response, wherein the delay is to reserve a certain acceleration time for the vehicle.
S153, the microprocessor of the current interval monitoring device sends and acquires that the current interval is lower than V through the radio frequency communication modulei-1And the vehicle speed command of the vehicle is generated, and an acquisition result is generated.
Interval RiThe microprocessor of the monitoring device sends a vehicle speed acquisition command to the screened lower-than-V vehicle speed through the radio frequency communication modulei-1Then waits for the reply of the receiving vehicle and finally obtains a value lower than Vi-1The vehicle speed of each vehicle is judged whether the vehicle speed is lower than Vi-1If any, produce less than Vi-1The vehicle information and the corresponding real-time vehicle speed second recording list, wherein the vehicle information comprises a license plate and a vehicle type; if not, the second record table is marked as no record (blank record table), and finally the second record table is sent to the server.
In this embodiment, the obtaining and executing the deceleration command specifically includes:
and S154, the microprocessor of the rear interval monitoring device sends a speed acquisition command to all vehicles currently in the range of the rear interval through the radio frequency communication module.
Interval Ri-1The microprocessor of the monitoring device sends a vehicle speed acquisition command to the region R through the radio frequency communication modulei-1All vehicles within the range then wait for the reply of the receiving vehicle to obtain the current interval Ri-1The license plate and the model of each vehicle and the corresponding vehicle speed are screened out that the vehicle speed is higher than ViThe vehicle of (1).
S155, screening by a microprocessor of the rear section monitoring device to obtain that the rear section is higher than ViThe vehicle sends a prompt command to the rear section through the radio frequency communication module, wherein the prompt command is higher than ViThe vehicle of (1); the prompt command is a deceleration command.
Interval Ri-1The microprocessor of the monitoring device sends a prompt command to the screened part higher than V through the radio frequency communication moduleiBy decelerating them to V or lessiHigher than ViAfter the vehicle receives the command, on one hand, the driver is prompted to strictly execute the command through an acousto-optic vibration module of the vehicle-mounted device, and the vehicle is decelerated to a normal value. If the current running speed is higher than 80km/h, please decelerate and otherwise accept corresponding punishment measures through voice broadcasting "(ii) a On the other hand, the vehicle-mounted device sends the response signal to the monitoring device through the radio frequency communication module to inform the monitoring device that the information is received, and the radio frequency communication module delays the set time after receiving the response, wherein the delay is to reserve a certain acceleration time for the vehicle.
And S156, sending a vehicle speed command for acquiring the vehicle with the rear interval higher than the average vehicle speed by a microprocessor of the rear interval monitoring device through a radio frequency communication module, and generating an acquisition result.
Interval Ri-1The microprocessor of the monitoring device sends a vehicle speed acquisition command to the screened vehicle speed higher than V through the radio frequency communication moduleiThen waits for the reply of the receiving vehicle and finally obtains a value higher than ViThe vehicle speed of each vehicle is judged whether the vehicle speed is higher than ViIf any, generate more than ViThe vehicle information and the corresponding real-time vehicle speed second recording list, wherein the vehicle information comprises a license plate and a vehicle type; if not, the second record table is marked as no record (blank record table), and finally the second record table is sent to the server.
In step S16, the execution result is stored.
And the server receives the first record table and the second record table sent by the monitoring device to obtain a finally refreshed record table. The resulting record table may have records or may be blank for subsequent processing.
In this embodiment, the record table is dynamically refreshed, for example, when the vehicle a is first collected to be accelerated as commanded, but the vehicle a is collected to be reduced to be lower than the average vehicle speed again in the second collection, which is rarely considered. Namely: whenever a vehicle is found that is not performing as commanded to the desired speed, it is recorded.
And when the record exists in the final record table, performing further processing, wherein the processing mode comprises the following steps:
1. the device such as the camera is arranged in the interval, the server is connected with the cameras (a plurality of cameras can be used), the cameras are used for shooting the video/pictures of the interval and transmitting the videos/pictures to the highway control room after shooting, so that the working personnel can conveniently check the pictures and judge whether the vehicles in the record list are artificially not to listen to the command or can not execute the command due to faults/accidents. For example, if the vehicle speed of a certain vehicle is monitored to be 0 for a long time, the vehicle is likely to be in a fault, or a single vehicle accident occurs; and if the vehicle speed of 2 vehicles is monitored to be 0 for a long time, accidents of two parties are likely to happen, and the like.
2. If the command is not heard manually, the server is connected with a computer of the high-speed exit, and workers can stop the vehicles at the high-speed exit, carry out education or take other punishment measures such as deduction and the like.
Generally, under the premise that the vehicle is in a normal state and has no accident, most drivers can execute commands (with the addition of traffic management penalty measures) for driving safety, so the occurrence probability of extreme situations is small, which means that the possibility that the vehicle which does not hear the commands cannot execute the commands due to the fault/accident is high. That is, the number of vehicles equal to or less than K is not difficult to reach in cooperation with the driver, meaning that congestion is about to occur, and the vehicle can be immediately cleared, that is, the number of vehicles greater than K does not occur.
Example two
The difference between the intelligent monitoring method for preventing traffic jam on the highway provided by the embodiment and the first embodiment is that:
the vehicle-mounted device of the embodiment has no vehicle speed sensor, and the vehicle speed measurement is realized by adopting the RSSI of wireless communication.
As shown in fig. 6, when the second rf communication module of the onboard device installed in the vehicle wirelessly communicates with the rf communication module of the monitoring device installed in the section, the monitoring device can read information such as a license plate and a model of the vehicle, and can read an RSSI value of wireless signal strength, which is related to the distance between both communication parties, and generally, the larger the distance, the smaller the RSSI value.
The realization of speed measurement:
and taking the central point of the interval as an origin of a coordinate axis, and establishing and storing a corresponding relation between the RSSI value and the horizontal distance in advance according to the specific conditions (the height of the support, the horizontal distance between the first sensor and the second sensor and the like) of the interval. As shown in fig. 6, if the RSSI value is read to be equal to the RSSI1, according to the corresponding relationship, it can be found that the distance between the vehicle and the origin is L1, but due to the omnidirectional property of the radio frequency signal, the point corresponding to L1 may be the point a or the point B, in order to solve the problem, the corresponding RSSI value at the origin, that is, the RSSI0, needs to be combined for judgment, and assuming that the vehicle travels from left to right, the variation trend of the RSSI value is from small to large at the left of the origin; and to the right of the origin, the variation of the RSSI values tends to be large to small.
After the RSSI1 is read for the first time, the RSSI2 is read for the second time, the time consumption T between the first time and the second time is counted, and the vehicle speed is (L1-L2)/T, namely the vehicle speed is obtained, the corresponding horizontal distance needs to be respectively found by means of the second RSSI value and the first RSSI value, subtraction is carried out, and the time consumption between the second time and the first time is divided by the time consumption, namely a sampling period.
EXAMPLE III
The present embodiment provides an intelligent monitoring system for preventing traffic jam on a highway, as shown in fig. 7, including:
the first obtaining module 11 is used for obtaining the number of vehicles in each section of the expressway; monitoring devices are arranged in all sections of the expressway;
the judging module 12 is configured to judge whether the number of the acquired vehicles in each interval is less than or equal to a first threshold;
the second obtaining module 13 obtains the number of vehicles in the rear section adjacent to the current section, and determines whether the number of vehicles in the obtained rear section is 0;
a third obtaining module 14, configured to obtain an average speed of the current interval and the rear interval, and determine whether the average speed of the current interval is greater than or equal to the average speed of the rear interval;
the sending module 15 is configured to send an acceleration command to the monitoring device in the current interval, send a deceleration command to the monitoring device in the rear interval, and receive execution results sent by the monitoring device in the current interval and the monitoring device in the rear interval;
and the storage module 16 is used for storing the execution result.
The implementation process of the intelligent monitoring system for preventing traffic jam on the highway provided in this embodiment is similar to that of the intelligent monitoring method for preventing traffic jam on the highway in the first embodiment, and details are not repeated here.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. An intelligent monitoring method for preventing traffic jam on a highway is characterized by comprising the following steps:
s1, acquiring the number of vehicles in each section of a highway; monitoring devices are arranged in all sections of the expressway;
s2, judging whether the number of the acquired vehicles in each section is smaller than or equal to a first threshold value, if so, executing a step S1; if not, go to step S3;
s3, acquiring the number of vehicles in a rear section adjacent to the current section, judging whether the acquired number of the vehicles in the rear section is 0 or not, and if yes, executing a step S6; if not, go to step S4; wherein the rear section is a section opposite to the vehicle running direction;
s4, acquiring the average speed of the current interval and the average speed of the rear interval, judging whether the average speed of the current interval is greater than or equal to the average speed of the rear interval or not, and if so, executing a step S6; if not, go to step S5;
s5, sending an acceleration command to the monitoring device in the current interval, sending a deceleration command to the monitoring device in the rear interval, and receiving execution results sent by the monitoring device in the current interval and the monitoring device in the rear interval;
and S6, storing the execution result.
2. The intelligent monitoring method for preventing traffic congestion on a highway according to claim 1, wherein the step S4 is preceded by the step of:
a countdown timer is started.
3. The intelligent monitoring method for preventing traffic congestion on the expressway according to claim 2, wherein the monitoring device comprises at least one first sensor, at least one second sensor, a radio frequency communication module, a microprocessor and a networking module; the first sensor is used for detecting whether a vehicle enters a current interval or not, and the second sensor is used for detecting whether the vehicle leaves the current interval or not.
4. The intelligent monitoring method for preventing traffic congestion on a highway according to claim 3, wherein the step S4 comprises:
s41, sending a command for acquiring the average speed of the vehicles in the current interval and the average speed of the vehicles in the rear interval to the monitoring device in the current interval and the monitoring device in the rear interval respectively;
s42, a microprocessor in the monitoring device of the current interval sends a speed command for acquiring all vehicles in the current interval through a radio frequency communication module, and calculates to obtain the average speed of the vehicles in the current interval; a microprocessor in the monitoring device of the rear interval sends and acquires speed commands of all vehicles in the rear interval through a radio frequency communication module, and calculates to obtain the average speed of the vehicles in the rear interval;
and S43, receiving the average speed calculated by the monitoring device in the current interval and the rear interval.
5. The intelligent monitoring method for preventing traffic congestion on a highway according to claim 3, wherein the step S5 comprises:
s51, the microprocessor of the current interval monitoring device sends a speed acquisition command to all vehicles in the current interval range through the radio frequency communication module;
s52, a microprocessor of the current interval monitoring device obtains vehicles with the current interval lower than the average speed through screening, and sends a prompt command to the vehicles with the current interval lower than the average speed through a radio frequency communication module; the prompt command is an acceleration command;
and S53, the microprocessor of the current interval monitoring device sends a vehicle speed command for acquiring the vehicle with the current interval lower than the average vehicle speed through the radio frequency communication module and generates an acquisition result.
6. The intelligent monitoring method for preventing traffic congestion on a highway according to claim 3, wherein the step S5 further comprises:
s54, the microprocessor of the rear interval monitoring device sends a vehicle speed acquisition command to all vehicles in the rear interval range through the radio frequency communication module;
s55, a microprocessor of the rear interval monitoring device obtains vehicles with rear intervals higher than the average speed through screening, and sends prompt commands to the vehicles with the rear intervals higher than the average speed through a radio frequency communication module; the prompt command is a deceleration command;
and S56, the microprocessor of the rear interval monitoring device sends a vehicle speed command for acquiring the vehicle with the rear interval higher than the average vehicle speed through the radio frequency communication module and generates an acquisition result.
7. The intelligent monitoring method for preventing traffic congestion on a highway according to claim 3, wherein the step S1 comprises:
s11, the first sensor acquires the number of vehicles entering a current interval, the second sensor acquires the number of vehicles leaving the current interval, and an acquisition result is sent to the microprocessor;
and S12, the microprocessor receives and processes the obtained result to obtain the number of the vehicles in the current interval.
8. The intelligent monitoring method for preventing the traffic jam on the expressway as recited in claim 3, further comprising a vehicle-mounted device, wherein the vehicle-mounted device is arranged in the vehicle; the vehicle-mounted device is in two-way communication with the radio frequency communication module.
9. The intelligent monitoring method for preventing traffic jam on expressway according to claim 8, wherein said vehicle-mounted device includes license plate and model of vehicle.
10. An intelligent monitoring system for preventing traffic jam on a highway, which is characterized in that the intelligent monitoring method for preventing traffic jam on the highway is based on any one of the claims 1 to 9.
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| US6690291B1 (en) * | 2000-04-21 | 2004-02-10 | Prodesign Technology, Inc. | Vehicle hazard warning system |
| CN104282165B (en) * | 2013-07-12 | 2017-07-28 | 深圳市赛格导航科技股份有限公司 | Section congestion warning method and device |
| CN104240500A (en) * | 2014-08-25 | 2014-12-24 | 奇瑞汽车股份有限公司 | Road condition information predicting method and system |
| CN105469612A (en) * | 2016-01-22 | 2016-04-06 | 大连楼兰科技股份有限公司 | Traffic jam alarming system and traffic jam alarming method |
| CN106251666A (en) * | 2016-08-08 | 2016-12-21 | 武汉理工大学 | Under the foggy environment of intelligent network connection automobile, expressway safety speed guides system and method |
| CN106781542B (en) * | 2016-12-30 | 2020-01-31 | 迈锐数据（北京）有限公司 | vehicle queuing length detection system, method and device |
| SE541480C2 (en) * | 2017-01-10 | 2019-10-15 | Scania Cv Ab | Method and system for estimating traffic flow |
| CN106816008B (en) * | 2017-02-22 | 2019-08-23 | 银江股份有限公司 | A kind of congestion in road early warning and congestion form time forecasting methods |
| CN106710216B (en) * | 2017-02-28 | 2019-08-30 | 广东省交通运输档案信息管理中心 | Highway real-time traffic congestion road conditions detection method and system |
| CN107146432A (en) * | 2017-06-15 | 2017-09-08 | 华南理工大学 | A kind of expressway fog zone variable speed-limit device and method |
| CN107085947A (en) * | 2017-06-21 | 2017-08-22 | 成都锐奕信息技术有限公司 | It is easy to check the inspection method for highway of vehicle |
| CN109658697B (en) * | 2019-01-07 | 2021-09-24 | 平安科技（深圳）有限公司 | Traffic congestion prediction method and device and computer equipment |
| CN109754621A (en) * | 2019-03-01 | 2019-05-14 | 苏州星奥达科技有限公司 | A kind of video analysis method based on Freeway Conditions situation |
| CN109931941B (en) * | 2019-03-09 | 2023-06-20 | 河南工业大学 | Route planning method based on road section state correlation |
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