CN114822017A - Overhead expressway traffic guidance system for avoiding local congestion queuing - Google Patents

Abstract

The invention discloses an elevated expressway traffic guidance system for avoiding local congestion and queuing, which relates to the field of urban elevated expressway traffic management and control and aims to avoid the problem of local queuing and congestion caused by elevated expressway traffic accidents or vehicle lane change and congestion and the like and ensure the full and effective utilization of elevated expressway resources; by the method, the overhead traffic flow is timely guided to the ground road, the upper ramp is drained again to enter the overhead passage after the local congestion queuing road section is avoided, and therefore other road section resources of the overhead passage are fully utilized on the premise of effectively avoiding the congestion queuing of the overhead passage, and the method has important significance for effectively utilizing the overhead passage and improving the urban traffic passage efficiency.

Description

An Elevated Expressway Passage Guidance System to Avoid Local Congestion and Queuing

technical field

The invention relates to the field of urban elevated expressway traffic management and control, in particular to an elevated expressway traffic guidance system for avoiding local congestion and queuing.

Background technique

As the highest-grade road in the city, the urban elevated expressway has the characteristics of large capacity and fast speed. It plays a skeleton role in the road traffic network of many large and medium-sized cities. The traffic safety and traffic efficiency of the whole city play a great role. Therefore, in order to effectively relieve the traffic pressure and adapt to the overall harmonious development of the city, many large and medium-sized cities choose to build urban elevated expressways to increase the speed of vehicles, improve road traffic capacity, and meet the needs of urban passenger and freight transport.

In recent years, with the increase in the number of motor vehicles in the city, the smooth operation of the elevated expressway has been affected and challenged, and traffic congestion incidents often occur. The occurrence of these traffic incidents may occupy part of the road of the elevated expressway due to problems such as congestion of vehicles, thereby reducing the traffic capacity of the elevated expressway and leading to the formation of congested queues. Congested queues are formed locally. If the subsequent traffic flow is not guided in time, it may spread rapidly and cause congestion on the entire road. If the traffic flow is only guided away from the elevated road and the traffic flow is not guided back in time, resources will be wasted on the non-queuing elevated road section. Therefore, it is very important to propose an elevated expressway traffic guidance system that avoids local congestion and queuing. Elevated expressway resources and effectively improve the efficiency of elevated expressway traffic is very necessary.

Aiming at the problem of the passage of elevated expressways, in order to improve the traffic flow efficiency of the main line of the elevated expressway and reduce the traffic flow density of the main line, the existing technology has adopted the current limiting control measures on the ramp of the elevated expressway; there are also new technologies through radar and video detection technology. Parameters such as the traffic flow speed and queue length of the elevated expressway are monitored, and through the analysis of the impact range of the queue, measures such as ramp control of the elevated expressway are adopted to implement a flow restriction and interception control plan for vehicles on the ramp. However, queuing is a dynamic change process, including two processes: the increase of the queue caused by the arrival of the vehicle and the dissipated queue caused by the departure of the vehicle ahead. Therefore, it is necessary to timely divert and intercept the up and down ramps traveling in the same direction around the surrounding according to the dynamic changes of the queue. At the same time, taking into account the need to make full use of the resources of the elevated road sections that are not queued, it is also necessary to guide the diverted vehicles back to the elevated expressway in time through a reasonable method. It is very important to make full use of the elevated road resources while reducing the impact of local congestion and queuing. necessary. Regarding the real-time monitoring of the dynamic changes of local congestion and queuing on the elevated expressway, and according to the increase and dissipation process of the queuing, it is related to the LED guidance screen and the ground signal lights at the ramp entrance in time to effectively divert and limit the flow of vehicles, and the vehicles that are diverted from the elevated expressway will be re-connected. The method of drainage back to the elevated expressway has not yet been covered.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art. The purpose of the present invention is to avoid the local queuing congestion problem caused by the traffic accident of the elevated expressway or the traffic jam of vehicles changing lanes, and to ensure the full and effective utilization of the resources of the elevated expressway. By monitoring the rear growth and front dissipation process of local congestion queues in real time every second, and dynamically correlating the upward and downward ramps at a certain distance before and after local queues, as well as the guidance and control methods of ground signal light supporting facilities, the overhead traffic flow is guided to the ground road in time. , to avoid local congestion and queue sections, and then re-drain the on-ramp to enter the elevated traffic, so as to make full use of the resources of other sections of the elevated expressway under the premise of effectively avoiding the congestion and queuing of the elevated expressway. Traffic efficiency is of great significance.

In order to achieve the above object, according to the embodiment of the first aspect of the present invention, an elevated expressway passing guidance system for avoiding local congestion and queuing is proposed, which includes a hardware layer and a processing layer, and data signals are passed between the hardware layer and the processing layer in real time. realize interaction;

The hardware layer includes microwave radar, LED guidance screen and intersection signal lights; the microwave radar is used to realize full-coverage real-time monitoring of vehicle traffic conditions on the entire line of the elevated expressway, and the LED guidance screen is installed at the entrance of the ramp on the elevated expressway and At the exit of the down-ramp; the intersection signal light is located on the urban road where the elevated up-down ramp is connected to the ground;

The processing layer includes a rule setting module, an analysis processing module, and a decision-making module. The rule setting module is used to set the traffic guidance rules, and the analysis processing module is used to receive the data signal sent by the hardware layer in real time, and combine the The rule setting module completes the passage guidance analysis, and the decision making module is used to receive the signal sent by the analysis processing module, and formulate the passage guidance decision.

Preferably, the microwave radar is installed on the roadside street lamp pole, the distance between the front and rear radars is a, the value of a is adjusted according to the actual situation, and the specific value is given by the processing layer;

By adjusting the angle, the detection range of the front and rear radars is partially overlapped without dead ends, thereby realizing full-coverage real-time monitoring of vehicle traffic on the entire line of the elevated expressway.

Preferably, when there is local congestion and queuing on the elevated, the associated control is performed with the ramps that divert and divert the elevated traffic, and the method of adjusting the green light time of the same direction of the elevated traffic and the coordination of the green light signals of multiple intersections is adopted.

Preferably, the process that the rule setting module performs the setting of the traffic guidance rules includes the following:

Area division; the rule setting module obtains the entire length of the main line of the entire elevated expressway, the rule setting module sets the length b of the detection area, and the value of b is adjusted according to the actual situation, and is set and given by the rule setting module;

Period setting; the rule setting module obtains the length of the detection area, and gives the statistical period T of the microwave radar. The value of T is adjusted according to the actual situation, and the specific value is set by the rule setting module; the processing layer passes the data The signal interaction sends the statistical period T to the hardware layer;

The threshold value is established; the rule setting module gives the area speed threshold V, and the value of V is adjusted according to the actual situation, and the specific value is set by the rule setting module; the rule setting module sends the established area speed threshold V to the Analytical processing module.

Preferably, the process that the analysis processing module realizes the traffic guidance analysis includes the following steps:

Step 1: The microwave radar detects the real-time speed of each time period, each detection area, and each vehicle in real time, and combines the statistical period T set by the rule setting module, and sends the detected real-time speed of each time period, each detection area, and each vehicle. to the analysis processing module;

Step 2: the analysis and processing module calculates the average vehicle speed of each detection area within the statistical period T; the analysis and processing module compares the average vehicle speed with the area speed threshold;

Step 3: When the average speed of vehicles in the detected area is less than or equal to the speed threshold of the area, mark the detected area as a congested area;

When the average speed of vehicles in the detection area is greater than the speed threshold of the area, the detection area is marked as a normal area;

Step 4: The analysis and processing module sends the congested area and the normal area to the decision-making module.

Preferably, the decision-making module is used to receive the signal sent by the analysis and processing module, and to formulate a traffic guidance decision, and the process includes the following steps:

The decision-making module receives the congested area and the normal area sent by the analysis and processing module, and the decision-making module merges the adjacent detection areas belonging to the same state and marks it as a congested road section or a normal road section;

The decision-making module obtains the distance between adjacent congested road sections and marks it as a buffer distance. When the buffer distance is less than the guiding threshold distance, the adjacent congested road sections are merged; and the queue start point and queue end point of the congested road section are obtained;

Step S3: The decision-making module diverts the real-time detection of the congested road section and the down-ramp intersection within c meters behind the queuing end in advance, and prompts through the LED guidance screen that "the front is congested, you can detour to the front on-ramp", and within this range All up-ramps are restricted, and the LED guidance screen will prompt "congestion ahead, no entry into the ramp";

The first up-ramp crossing within a range of d meters in front of the starting point of the queue shall conduct timely drainage, and the LED guidance screen will prompt "there is no congestion ahead, you can enter the elevated ramp on the ramp";

The decision-making module controls the signal lights at the intersection to ensure that the vehicle can bypass the partially congested section of the elevated road in time, and the green wave of the ground signal light is coordinated and linked to quickly pass to the next up-ramp without congestion ahead, and then re-enter the elevated passage.

Compared with the prior art, the beneficial effects of the present invention are:

1. By monitoring the rear growth and front dissipation process of local congestion queues in real time every second, and dynamically correlating the guidance and control methods of up and down ramps at a certain distance before and after local queues, as well as ground signal light supporting facilities, the overhead traffic flow is guided in time to On the ground road, avoid local congestion and queuing sections, and then re-drain onto the ramp to enter the elevated passage, so as to make full use of the resources of other sections of the elevated expressway on the premise of effectively avoiding the congestion and queuing of the elevated expressway. This is for the effective use of the elevated expressway and It is of great significance to improve the efficiency of urban traffic.

2. Aiming at the problem of the guidance method for avoiding local congestion and queuing of the elevated expressway, the present invention uses microwave radar to monitor the entire line of the elevated expressway, divides the elevated expressway into multiple continuous detection areas, and detects the average speed of vehicles in each area in real time and judges. Whether queuing occurs or not, when a local congestion queuing occurs, the dynamic change process of the growth and dissipation of the local congestion queuing is monitored every second, and on this basis, an elevated expressway traffic guidance method is proposed, which realizes real-time monitoring of the local congestion queuing on the elevated expressway and early diversion. and timely drainage to form an effective management and control plan to prevent subsequent vehicles from further increasing the queue length of congestion, and to divert the diverted vehicles back to the elevated expressway in time, so as to make full use of the premise of effectively avoiding local congestion and queuing on the elevated expressway. Good elevated expressway unaffected road resources.

Description of drawings

Figure 1 is a flow chart of a method for guiding the passage of an elevated expressway to avoid local congestion and queuing;

Figure 2 is a schematic diagram of the installation position and detection range of the system equipment;

3 is a schematic diagram of a method for guiding the passage of an elevated expressway to avoid local congestion and queuing;

Fig. 4 is a schematic diagram of a distinction method considering multiple local congestion queuing on an elevated;

Figure 5 is a schematic diagram of an elevated expressway traffic guidance system for avoiding local congestion and queuing.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The embodiment of the first aspect of the present invention proposes an elevated expressway passing guidance system that avoids local congestion and queuing. As shown in FIG. 5 , the guidance system includes: a hardware layer and a processing layer, and a space between the hardware layer and the processing layer is Real-time interaction through data signals;

The hardware layer includes microwave radar, LED guidance screen and intersection signal lights; the microwave radar is used to realize full-coverage real-time monitoring of vehicle traffic conditions on the entire line of the elevated expressway, and the LED guidance screen is installed at the entrance of the ramp on the elevated expressway and at the exit of the down-ramp;

It should be noted that, in a specific embodiment, taking the upward direction as an example, the microwave radar is installed on the roadside street lamp pole, and the distance between the front and rear radars is a, where a is generally 100 meters, And the value of a is adjusted according to the actual situation, and the specific value is given by the processing layer; in the specific operation process, by adjusting the appropriate angle, the detection ranges of the front and rear two radars partially overlap without dead ends, so as to realize the detection of the elevated expressway. Full coverage real-time monitoring of vehicle traffic across the line;

The LED guidance screen is installed on the up-ramp entrance and the down-ramp exit of the elevated expressway in the form of a pole. The LED-induction screen at the exit of the down-ramp displays "congestion ahead, you can detour to the up-ramp ahead" according to the vehicle diversion situation, and the entrance of the up-turn According to the different situations of vehicle flow restriction and diversion, the LED guidance screen at the place respectively displays "congestion ahead, no entry to the ramp" and "no congestion ahead, you can enter the elevated ramp on the ramp";

The intersection signal light is located on the urban road where the elevated up and down ramps are connected to the ground. When there is a local congestion and queue on the elevated, it can be controlled in association with the ramps that divert and divert the elevated traffic, and adjust the green light time of the elevated traffic in the same direction and the green light signals of multiple intersections. Coordinated way to ensure the rapid passage of overhead diversion and diversion vehicles;

Wherein, the processing layer includes a rule setting module, an analysis processing module, and a decision making module, and the rule setting module is used to set the passage guidance rules. Specifically, the process of the rule setting module setting the passage guidance rules includes: the following:

Area division: The rule setting module obtains the entire length of the main line of the entire elevated expressway, and the rule setting module sets the length b of the detection area, where b is generally 2 meters, and the value of b is adjusted according to the actual situation. The specific value is determined by The rule setting module setting is given;

Period setting: The rule setting module obtains the length of the detection area, and gives the statistical period T of the microwave radar, where the value of T is generally 10s, and the value of T is adjusted according to the actual situation, and the specific value is set by the rules. The module setting is given; the processing layer sends the statistical period T to the hardware layer through data signal interaction;

Threshold establishment: The rule setting module gives the speed threshold V of the area, where the value of V is generally 5km/h, and the value of V is adjusted according to the actual situation, and the specific value is set by the rule setting module; The speed threshold is used to determine the local congestion and queuing of the road section at this time; the rule setting module sends the established area speed threshold V to the analysis and processing module;

The analysis and processing module is used to receive the data signal sent by the hardware layer in real time, and complete the traffic guidance analysis in conjunction with the rule setting module. Specifically, the analysis and processing module realizes the process of the traffic guidance analysis including the following steps:

Step 1: The microwave radar detects the real-time speed of each time period, each detection area, and each vehicle in real time, and combines the statistical period T set by the rule setting module, and sends the detected real-time speed of each time period, each detection area, and each vehicle. to the analysis processing module;

Step 2: the analysis and processing module calculates the average vehicle speed of each detection area within the statistical period T; the analysis and processing module compares the average vehicle speed with the area speed threshold;

Step 3: When the average speed of vehicles in the detected area is less than or equal to the speed threshold of the area, mark the detected area as a congested area;

When the average speed of vehicles in the detection area is greater than the speed threshold of the area, the detection area is marked as a normal area;

Step 4: The analysis and processing module sends the congested area and the normal area to the decision-making module.

Among them, it needs to be further explained that the congested area and the normal area are a dynamic change process of growth and dissipation.

The decision-making module is used to receive the signal sent by the analysis and processing module, and to formulate a traffic guidance decision. The specific process includes the following steps:

Step S1: the decision-making module receives the congested area and the normal area sent by the analysis and processing module, and the decision-making module merges the adjacent detection areas belonging to the same state, and marks it as a congested road section or a normal road section;

Step S2: the decision making module obtains the distance between adjacent congested road sections and marks it as a buffer distance, when the buffer distance is less than the guiding threshold distance, the adjacent congested road sections are merged; and the queuing start point and queuing end point of the congested road section are obtained;

Step S3: The decision-making module divides the down-ramp crossings within the range of c meters (c is 1000 meters and can be adjusted according to the actual situation) behind the real-time detection of the congested road section and the queuing end point in advance, and prompts the LED guide screen to prompt "congestion ahead. , you can detour to the on-ramp ahead", and all the up-ramps within this range are restricted, and the LED guidance screen prompts "the front is congested, it is forbidden to enter the ramp";

The first up-ramp crossing outside the range of d meters in front of the starting point of the queue (d is 200 meters, which can be adjusted according to the actual situation) shall be drained in time, and the LED guidance screen will prompt "there is no congestion ahead, you can enter the elevated ramp on the ramp";

Step 4: The decision-making module controls the signal lights at the intersection to ensure that the vehicle can bypass the partially congested section of the elevated road in time, and the green wave of the ground signal light is coordinated and linked to quickly pass to the next up-ramp without congestion ahead, and then re-enter the elevated passage. .

In a specific embodiment, as shown in FIG. 1 , in combination with FIG. 2 to FIG. 4 , a method for guiding the passage of an elevated expressway to avoid local congestion and queuing is proposed for an embodiment of another aspect of the present invention, and the method includes the following steps:

First, as shown in Figure 2, the equipment installation of an elevated expressway passage guidance system that avoids local congestion and queuing is completed;

Secondly, as shown in Figure 3, the elevated expressway is divided into a detection area every 2m in the longitudinal direction;

Then, use the installed microwave radar detection equipment to detect the real-time speed of the elevated expressway in each time period, each area, and each vehicle, and count the average speed of each area every 10 seconds;

Determine the average speed in the area and the size of 5km/h. If the average speed in a certain area is less than or equal to 5km/h, it is determined that a local congestion queuing event occurs in this area. It can monitor the dynamic change process of the growth and dissipation of local congestion queues on the elevated expressway, and then dynamically guide the vehicles passing on the elevated expressway through the associated control of the elevated up and down ramps, LED guidance screens and intersection lights.

Since the local congestion queuing is a process in which the number of vehicles coming from the rear is increasing and the vehicles are dissipating in the front, it is necessary to guide and control the traffic flow of the elevated expressway at a certain distance before and after the local congestion.

As shown in Figure 4, when a local congestion queuing event is detected in section AB, the up and down ramps within 1000 meters behind section AB and end point B (which can be adjusted according to the actual situation) will be diverted and flow-limited. Up-ramp ① LED guidance screen prompts "congestion ahead, prohibit the entry of the ramp" to avoid the increase in queue length; for down-ramp ② LED guidance screen prompts "front congestion, you can detour to the front on-ramp", prompting the vehicle to get off the elevated road ahead of time to avoid the congested road section ;The processing method of up-ramp ③ is the same as that of up-ramp ①;

At the same time, control the flow of the first upward ramp 200 meters in front of the starting point A (which can be adjusted according to the actual situation), and do not do any processing on the downward ramp. At this time, the LED guidance screen of the downward ramp does not display guidance information; ⑤ The LED guidance screen prompts "there is no congestion ahead, you can enter the elevated passage on the ramp", and divert the traffic flow from the partially crowded queue back to the elevated expressway again.

In addition, the green-signal ratio of the intersection signals passed by the vehicles guided to the ground is adjusted and the multi-intersection green light signals are coordinated and controlled, so as to ensure that the vehicles diverted from the elevated expressway can get enough green light time and pass the green light continuously, so as to It can quickly pass through the ground road intersection and divert the flow back to the elevated expressway in time.

Considering that multiple local congestion queuing situations may occur, the method shown in Figure 4 is used to distinguish them. The above process changes in real time according to the dynamic growth and dissipation of local congestion queues on the elevated expressway. As the local congestion queues dissipate, the associated ramps, LED guidance screens and intersection signal lights will gradually resume normal operation. After the local congestion queues are completely dissipated , all the associated ramps, LED guidance screens and intersection lights have all returned to normal operation.

The above embodiments are only used to illustrate the technical method of the present invention and not limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of the present invention can be modified or equivalently replaced. Without departing from the spirit and scope of the technical method of the present invention.

Claims (6)

1. An overhead expressway traffic guidance system for avoiding local congestion queuing is characterized by comprising a hardware layer and a processing layer, wherein the hardware layer and the processing layer realize interaction through data signals in real time;

the hardware layer comprises a microwave radar, an LED induction screen and an intersection signal lamp; the microwave radar is used for realizing full-coverage real-time monitoring of the vehicle passing condition of the whole line of the overhead expressway, and the LED induction screens are installed at the entrance of an ascending ramp and the exit of a descending ramp of the overhead expressway; the signal lamp of the intersection is positioned on the urban road where the ascending and descending ramps of the elevated frame are connected with the ground;

the processing layer comprises a rule setting module, an analysis processing module and a decision making module, the rule setting module is used for setting a passing guide rule, the analysis processing module is used for receiving data signals sent by a hardware layer in real time and finishing passing guide analysis by combining the rule setting module, and the decision making module is used for receiving the signals sent by the analysis processing module and making a passing guide decision.

2. The overhead expressway guidance system for avoiding local congestion and queuing as claimed in claim 1, wherein the microwave radar is mounted on a roadside streetlamp member, the arrangement distance between the front and rear radars is a, the value of a is adjusted according to actual conditions, and the specific numerical value is given by the processing layer;

the front and the back radar detection ranges are partially overlapped without dead angles by adjusting the angle, and then the full-coverage real-time monitoring of the overhead expressway all-line vehicle passing condition is realized.

3. The system as claimed in claim 1, wherein when the local congestion queuing occurs, the system performs the associated control with the ramp of overhead diversion and diversion by adjusting the green light time of the overhead passing in the same direction and coordinating the green light signals at a plurality of intersections.

4. The overhead expressway traffic guidance system avoiding local congestion queuing of claim 1, wherein the process of setting the traffic guidance rules by the rule setting module comprises the following steps:

dividing a slice region; the rule setting module acquires the length of the whole line of the main line of the whole line overhead expressway, sets the length b of the detection area, and the value of b is adjusted according to the actual condition and is set by the rule setting module;

setting a period; the rule setting module acquires the length of the detection area and gives a statistical period T of the microwave radar, the value of the T is adjusted according to the actual situation, and the specific numerical value is set and given by the rule setting module; the processing layer sends the statistical period T to the hardware layer through data signal interaction;

establishing a threshold value; the rule setting module gives a speed threshold V of the film area, the value of V is adjusted according to the actual situation, and the specific value is set and given by the rule setting module; the rule setting module sends the established parcel speed threshold V to the analysis processing module.

5. The system of claim 1, wherein the process of implementing traffic guidance analysis by the analysis processing module comprises the following steps:

the method comprises the following steps: the microwave radar detects the real-time speed of each time interval, each detection area and each vehicle in real time, and sends the detected real-time speed of each time interval, each detection area and each vehicle to the analysis processing module in combination with the statistical period T set by the rule setting module;

step two: the analysis processing module calculates the average speed of the vehicle in each detection area in the statistical period T; the analysis processing module compares the average speed of the vehicle with a parcel speed threshold;

step three: when the average speed of the vehicles in the detection zone is less than or equal to the zone speed threshold value, marking the detection zone as a congestion zone;

when the average speed of the vehicles in the detection section is greater than the section speed threshold value, marking the detection section as a normal section;

step four: and the analysis processing module sends the congestion block area and the normal block area to the decision making module.

6. The system according to claim 1, wherein the decision-making module is configured to receive the signal sent by the analysis processing module and make a traffic guidance decision, and the process includes the following steps:

the decision making module receives the jammed sub-areas and the normal sub-areas sent by the analysis processing module, and merges adjacent detection sub-areas belonging to the same state and marks the detection sub-areas as jammed road sections or normal road sections;

the decision making module acquires the distance between the adjacent congested road sections, marks the distance as a buffer distance, and merges the adjacent congested road sections when the buffer distance is smaller than a guide threshold distance; acquiring a queuing starting point and a queuing end point of a congested road section;

the decision making module shunts the congestion road section detected in real time and the downlink ramp junction within a range of c meters behind the queuing terminal point in advance, and prompts 'congestion ahead and detouring to an upper ramp ahead' through an LED induction screen, all the upper ramps within the range are limited, and prompts 'congestion ahead and no-entry ramp' through the LED induction screen;

the first ascending ramp port outside the range d meters ahead of the queuing starting point is drained, and an LED induction screen is used for prompting that no congestion exists ahead and the ramp can be loaded to an overhead;

and the decision making module performs associated control on the intersection signal lamp.

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