Vehicle priority passing method and system without intervention of background command center

Abstract

The invention provides a vehicle priority passing method and system without intervention of a background command center. A vehicle sends a navigation route, real-time positioning information of the vehicle and vehicle speed information to edge equipment along the line through a wireless private network; the edge device calculates the time for the vehicle to arrive at the next intersection, and calculates the green light prolonging time according to the saturation of the intersection in each direction; the vehicle-mounted equipment controls the traffic signal control machine through the edge equipment; and when the saturation degree of the edge device in each direction is smaller than a preset value, the signal lamp of the next intersection is switched to be green according to the time when the vehicle arrives at the next intersection. And when the saturation in each direction is greater than or equal to a preset value, switching the signal lamp of the next intersection to a green light according to the time when the vehicle arrives at the next intersection, and prolonging the green light state according to the green light prolonging time. Through real-time communication between the vehicle and the edge device, adjustment of the signal lamp is realized, and it is ensured that the vehicle can quickly pass through the intersection when executing a task.

Description

Technical Field

[0001] The present invention relates to a traffic control system, and in particular, to a vehicle priority passing method and system without the intervention of a background command center. Background Art

[0002] Intelligent traffic signal control realizes the dynamic optimization of traffic signals through the integration of modern information technology, big data analysis and artificial intelligence technology, effectively alleviates urban traffic congestion problems, and improves traffic efficiency. For safety reasons, the control center (signal control platform) of intelligent traffic signal control must be connected to devices such as controllers and fault detectors of each traffic light through a dedicated wired network (video private network).

[0003] For vehicles on emergency missions, it is very important to quickly reach the destination and safely pass through each traffic light intersection. The current common practice is that the command center controls the traffic lights at corresponding intersections in combination with the positioning data of the vehicle or the instructions issued by the vehicle. Due to the unpredictability of road traffic conditions, the vehicle and the command center need to communicate in real time, send requests to the command center through dedicated short-range communication technology (DSRC), and then the command center can accurately control the traffic light state. This method that requires multiple round-trip communications is easily affected by network latency, resulting in all parties being unable to receive information and make responses in a timely manner, and unable to switch traffic lights in a timely and effective manner.

[0004] Patent document CN111047881A discloses a special vehicle priority control method. Before the vehicle fleet arrives at the intersection, it needs to request the traffic lights at the intersection. This request strategy is controlled by distance. The higher the level, the longer the pre-control distance; the recovery strategy is to make an exit request according to the number of vehicles in the fleet, and the reference value is 3s per vehicle; for example, if the fleet consists of 7 vehicles, after the leading vehicle passes the traffic light, the green light should be reserved for at least 21s. This solution still needs to send requests to the command center in the background to control the traffic lights to complete the task. Summary of the Invention

[0005] Aiming at the defects in the prior art, the purpose of the present invention is to provide an offline navigation method and system.

[0006] According to a vehicle priority passing method without the intervention of a background command center provided by the present invention, it includes: Route acquisition step: The vehicle obtains a navigation route through a navigation software; Edge device connection step: The vehicle establishes a communication connection with edge devices along the line through a wireless private network, and sends the navigation route, real-time positioning information and vehicle speed information of the vehicle to the edge devices along the line; Edge computing step: The edge device calculates the time for the vehicle to reach the next intersection based on the navigation route, the real-time positioning information, and the vehicle speed information, and calculates the green light extension time according to the saturation of each direction at the intersection; Signal light control step: The in-vehicle device sends a status switching instruction to the edge device through the wireless private network, so as to control the traffic signal controller through the edge device; and, when the saturation of each direction is less than the preset value, the edge device switches the signal light at the next intersection to green according to the time for the vehicle to reach the next intersection; when the saturation of each direction is greater than or equal to the preset value, the edge device switches the signal light at the next intersection to green according to the time for the vehicle to reach the next intersection, and extends the green light state according to the green light extension time.

[0007] Further, the method for calculating the time for the vehicle to reach the next intersection includes: Calculating the distance d of the vehicle from the current position to the next intersection according to the real-time positioning information of the vehicle, and the time t to reach the next intersection is t = d / v, where v is the vehicle speed.

[0008] Further, the method for calculating the saturation of each direction includes:

[0009] is the saturation of the i-th direction, is the current traffic flow of the i-th direction, is the saturated traffic flow of the i-th direction.

[0010] Further, the method for calculating the green light extension time includes:

[0011]

[0012] is the green light extension time, is the time to reach the next intersection, is the vehicle emergency coefficient, is the saturation coefficient of each direction, n is the number of vehicle directions at the intersection, is the saturation of the i-th direction.

[0013] Further, the edge device includes a wireless private network module and a video private network module. The wireless private network module is wirelessly communicatively connected to the vehicle, the video private network module is wiredly connected to the signal light controller and the camera, and the wireless private network module and the video private network module communicate with each other; The signal light control step further includes: obtaining the status switching instruction from the vehicle through the wireless private network module, and sending it to the corresponding signal light controller through the video private network module to adjust the status of the corresponding signal light.

[0014] Furthermore, the traffic signal control step further includes: The vehicle directly establishes a wireless communication connection with the corresponding traffic signal through the wireless private network and sends a status switching instruction to switch the traffic signal to green.

[0015] A vehicle priority passage system without the intervention of a background command center according to the present invention includes: A navigation software for obtaining a navigation route; An in-vehicle device establishes a communication connection with edge devices along the line through the wireless private network, and sends the navigation route, real-time positioning information, and vehicle speed information of the vehicle to the edge devices along the line; Edge devices: Calculate the time for the vehicle to reach the next intersection according to the navigation route, the real-time positioning information, and the vehicle speed information, and calculate the green light extension time according to the saturation degree in each direction of the intersection; The edge device controls the corresponding traffic signal control module according to the calculated green light extension time; A traffic signal control module: Communicates with the edge device and directly controls the traffic signal according to the edge device; Among them, when the saturation degree in each direction is less than the preset value, the edge device switches the traffic signal at the next intersection to green according to the time for the vehicle to reach the next intersection; when the saturation degree in each direction is greater than or equal to the preset value, the edge device switches the traffic signal at the next intersection to green according to the time for the vehicle to reach the next intersection, and extends the green light state according to the green light extension time.

[0016] Furthermore, the edge device includes a wireless private network module and a video private network module. The wireless private network module is wirelessly connected to the vehicle, the video private network module is wired to the traffic signal controller and the camera, and the wireless private network module communicates with the video private network module.

[0017] Furthermore, the edge device obtains a status switching instruction from the vehicle through the wireless private network module and sends it to the corresponding traffic signal control module through the video private network module.

[0018] Furthermore, the traffic signal control module includes a wireless private network module, which can establish a wireless communication connection with the in-vehicle device and directly obtain a status switching instruction from the vehicle.

[0019] Compared with the prior art, the present invention has the following beneficial effects: Through real-time communication and intelligent signal light adjustment, the present invention greatly reduces the waiting time of police cars at intersections, improving the efficiency of police cars in performing tasks. The entire process requires no manual intervention, achieving automatic adjustment of signal lights and reducing the influence of human factors. The on-vehicle device can dynamically adjust signal lights manually or automatically according to real-time traffic congestion, avoiding delay problems during communication with the command center. It is not only applicable to police cars but also helps optimize the entire road traffic flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, other features, objects, and advantages of the present invention will become more apparent: Figure 1 is the flowchart of the operation of the present invention; Figure 2 is the schematic diagram of the operation principle of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can be made. These all fall within the protection scope of the present invention.

[0022] Embodiment 1 As Figure 1 shown, a method for preferential vehicle passage without the intervention of a background command center includes: Route acquisition step: The vehicle obtains a navigation route through a navigation software. Among them, the vehicle can be a special vehicle such as a police car, an ambulance, or a fire truck. A positioning module, such as GPS or Beidou system, is installed on the vehicle to ensure real-time and accurate acquisition of the vehicle's positioning information. At the same time, a wireless communication module, such as 4G or 5G communication module, is equipped on the vehicle to send the positioning information and vehicle speed information to the edge device.

[0023] Edge device connection step: The vehicle establishes a communication connection with the edge devices along the line through a wireless private network, and sends the vehicle's navigation route, real-time positioning information, and vehicle speed information to the edge devices along the line. The edge devices are arranged on the road, and at least one edge device is arranged on each road. Multiple edge devices on one road need to be spaced at a predetermined distance. The edge device has data processing capabilities, such as using an embedded processor. The edge device is connected to the traffic signal controller by wired or wireless means to achieve data transmission.

[0024] Edge computing step: The edge device calculates the time for the vehicle to reach the next intersection based on the navigation route, the real-time positioning information, and the vehicle speed information, and calculates the green light extension time according to the saturation degree of each direction at the intersection.

[0025] Calculate the distance d of the vehicle from the next intersection according to the real-time positioning information of the vehicle. The time t to reach the next intersection is t = d / v, where v is the vehicle speed.

[0026] The methods for calculating the saturation degree in each direction include:

[0027] is the saturation degree in the i-th direction, is the current traffic flow in the i-th direction, is the saturated traffic flow in the i-th direction.

[0028] The methods for calculating the green light extension time include:

[0029]

[0030] is the green light extension time, is the time to reach the next intersection, is the vehicle emergency degree coefficient, is the saturation degree coefficient in each direction, and n is the number of vehicle directions at the intersection, is the saturation degree in the i-th direction.

[0031] Steps for signal lamp control: The in-vehicle device sends a status switching instruction to the edge device through a wireless private network, so as to directly control the traffic signal controller through the edge device; and, when the saturation degree in each direction is less than the preset value, the edge device switches the signal lamp at the next intersection to green according to the time for the vehicle to reach the next intersection; when the saturation degree in each direction is greater than or equal to the preset value, the edge device switches the signal lamp at the next intersection to green according to the time for the vehicle to reach the next intersection, and extends the green light state according to the green light extension time to ensure that the vehicle can pass safely while minimizing the impact on other vehicles.

[0032] As Figure 2 shown, the system architecture for implementing the method of the present invention needs to include: a vehicle terminal, an edge device, and a signal lamp controller. The vehicle terminal is equipped with a high-precision positioning module, which can obtain the position information of the vehicle in real time and send this information to the nearby edge device through a wireless communication module. The edge devices are distributed on both sides of the road, with data processing and communication capabilities, and can receive the positioning information sent by the vehicle terminal and communicate with the signal lamp controller.

[0033] When the vehicle is performing a task, the vehicle terminal sends its own positioning information to the surrounding edge devices in real time. Based on the received vehicle position information and the traffic congestion situation of the road where it is located collected by itself (such as monitoring the traffic flow and vehicle speed through cameras), the edge device determines whether the vehicle is about to reach the intersection within the coverage of this device. If the vehicle is about to arrive, the edge device calculates the optimal signal light adjustment plan according to the pre-set algorithm and sends the plan to the traffic signal controller. The traffic signal controller adjusts the signal light status of the corresponding intersection according to the instruction sent by the edge device to ensure that the vehicle can pass quickly. In addition, to cope with emergencies, the traffic signal controller can also be directly wirelessly connected to the vehicle terminal to obtain instructions from the vehicle, so as to directly adjust the signal light to green.

[0034] Embodiment 2 The present invention also provides a vehicle priority passing system without the intervention of a background command center. The vehicle priority passing system without the intervention of a background command center can be implemented by executing the process steps of the vehicle priority passing method without the intervention of a background command center. That is, those skilled in the art can understand the vehicle priority passing method without the intervention of a background command center as a preferred implementation manner of the vehicle priority passing system without the intervention of a background command center. The system includes: A navigation software for obtaining a navigation route.

[0035] An in-vehicle device establishes a communication connection with the edge devices along the line through a wireless private network, and sends the navigation route, the real-time positioning information of the vehicle, and the vehicle speed information to the edge devices along the line.

[0036] Edge device: calculates the time for the vehicle to reach the next intersection according to the navigation route, real-time positioning information, and vehicle speed information, and calculates the green light extension time according to the saturation degree in each direction of the intersection; the edge device controls the corresponding signal light control module according to the calculated green light extension time.

[0037] Signal light control module: is communicatively connected to the edge device and directly controls the signal light according to the edge device.

[0038] Among them, when the saturation degree in each direction is less than the preset value, the edge device switches the signal light of the next intersection to green according to the time for the vehicle to reach the next intersection; when the saturation degree in each direction is greater than or equal to the preset value, the edge device switches the signal light of the next intersection to green according to the time for the vehicle to reach the next intersection, and extends the green light state according to the green light extension time.

[0039] The edge device includes a private wireless network module and a private video network module. The private wireless network module is wirelessly communicatively connected to the vehicle, and the private video network module is wiredly connected to the signal lamp controller and the camera. The private wireless network module and the private video network module are communicatively connected to each other. The edge device obtains the status switching instruction from the vehicle through the private wireless network module and sends it to the corresponding signal lamp control module through the private video network module. The signal lamp control module includes a private wireless network module and can establish a wireless communication connection with the in-vehicle device to directly obtain the status switching instruction from the vehicle.

[0040] As known to those skilled in the art, in addition to implementing the system and its various devices, modules, and units provided by the present invention in the form of pure computer-readable program code, the method steps can be logically programmed to enable the system and its various devices, modules, and units provided by the present invention to be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers, etc. to achieve the same functions. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for implementing various functions can also be regarded as the structures within the hardware component; the devices, modules, and units for implementing various functions can also be regarded as both software modules for implementing the method and the structures within the hardware component.

[0041] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific implementation manners, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A vehicle priority passing method without the intervention of a background command center, characterized in that, Including: Route acquisition step: The vehicle obtains a navigation route through a navigation software; Edge device connection step: The vehicle establishes a communication connection with edge devices along the line through a wireless private network, and sends the navigation route, the vehicle's real-time positioning information, and speed information to the edge devices along the line; Edge computing step: The edge device calculates the time for the vehicle to reach the next intersection based on the navigation route, the real-time positioning information, and speed information, and calculates the green light extension time based on the saturation of each direction at the intersection; Signal light control step: The in-vehicle device sends a status switching instruction to the edge device through the wireless private network, so as to control the traffic signal controller through the edge device; Moreover, when the saturation of each direction is less than a preset value, the edge device switches the signal light at the next intersection to green according to the time for the vehicle to reach the next intersection; when the saturation of each direction is greater than or equal to the preset value, the edge device switches the signal light at the next intersection to green according to the time for the vehicle to reach the next intersection, and extends the green light state according to the green light extension time.

2. The vehicle priority passing method without the intervention of a background command center according to claim 1, characterized in that The method for calculating the time for the vehicle to reach the next intersection includes: Calculating the distance d of the vehicle from the next intersection based on the vehicle's real-time positioning information, and the time t to reach the next intersection is t = d / v, where v is the vehicle speed.

3. The vehicle priority passing method without the intervention of a background command center according to claim 1, characterized in that The method for calculating the saturation of each direction includes: is the saturation degree in the i-th direction, is the current traffic flow in the i-th direction, is the saturated traffic flow in the i-th direction.

4. The vehicle priority passing method without the intervention of a background command center according to claim 1, characterized in that, The method for calculating the green light extension time includes: is the extended green light time, is the time to reach the next intersection, is the vehicle emergency coefficient, is the saturation coefficient in each direction, and n is the number of vehicle directions at the intersection, is the saturation of the i-th direction.

5. The vehicle priority passing method without the intervention of a background command center according to claim 1, characterized in that, The edge device includes a wireless private network module and a video private network module. The wireless private network module is wirelessly communicatively connected to the vehicle, the video private network module is wiredly connected to the signal light controller and the camera, and the wireless private network module and the video private network module communicate with each other; The signal light control step further includes: obtaining a status switching instruction from the vehicle through the wireless private network module, and sending it to the corresponding signal light controller through the video private network module to adjust the status of the corresponding signal light.

6. The vehicle priority passing method without the intervention of the background command center according to claim 1, wherein The signal light control step further includes: The vehicle directly establishes a wireless communication connection with the corresponding signal light through the wireless private network and sends a status switching instruction to switch the signal light to green.

7. A vehicle priority passing system without the intervention of a background command center, characterized in that, Including: Navigation software, used to obtain a navigation route; In-vehicle device, which establishes a communication connection with edge devices along the line through a wireless private network, and sends the navigation route, the vehicle's real-time positioning information, and speed information to the edge devices along the line; Edge device: Calculating the time for the vehicle to reach the next intersection based on the navigation route, the real-time positioning information, and speed information, and calculating the green light extension time based on the saturation of each direction at the intersection; The edge device controls the corresponding signal light control module according to the calculated green light extension time; Signal light control module: Communicatively connected to the edge device, and directly controls the signal light according to the edge device; Wherein, when the saturation of each direction is less than a preset value, the edge device switches the signal light at the next intersection to green according to the time for the vehicle to reach the next intersection; when the saturation of each direction is greater than or equal to the preset value, the edge device switches the signal light at the next intersection to green according to the time for the vehicle to reach the next intersection, and extends the green light state according to the green light extension time.

8. The vehicle priority passing system without the intervention of the background command center according to claim 7, characterized in that, The edge device includes a private wireless network module and a private video network module. The private wireless network module is wirelessly communicatively connected to the vehicle. The private video network module is wiredly connected to a signal lamp controller and a camera. The private wireless network module and the private video network module are communicatively connected to each other.

9. The vehicle priority passing system without the intervention of a backstage command center according to claim 8, characterized in that, The edge device obtains a status switching instruction from the vehicle through the private wireless network module and sends it to the corresponding signal lamp control module through the private video network module.

10. The vehicle priority access system without the intervention of a backstage command center according to claim 7, characterized in that, The signal lamp control module includes a private wireless network module, which can establish a wireless communication connection with the in-vehicle device and directly obtain a status switching instruction from the vehicle.

Images