Tunnel driving speed recommendation method and system, terminal and storage medium

Abstract

The invention relates to the technical field of tunnel regulation and control, in particular to a tunnel driving speed recommendation method and system, a terminal and a storage medium, and the method comprises the following steps: S1, obtaining tunnel information including tunnel length, tunnel pavement friction and tunnel speed limit, and vehicle information in a tunnel; the information of the vehicles in the tunnel comprises the number of the vehicles in the tunnel, the current distance between the vehicle and a front vehicle, and the current speed and acceleration of the vehicle; s2, calculating the traffic flow density in the tunnel and the safety distance between adjacent vehicles according to the tunnel information and the vehicle information in the tunnel; and S3, calculating a recommended speed based on the tunnel information, the traffic flow density and the safe distance, and pushing the recommended speed to the vehicles in the tunnel. The vehicles run according to respective recommended speeds, so that the interference to traffic flow caused by too fast or too slow speed of individual vehicles can be avoided, and the overall passing efficiency is improved. And energy waste and time delay caused by traffic jam are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel control, and in particular to a method, system, terminal and storage medium for recommending tunnel driving speed. Background Art

[0002] Tunnels are a special type of traffic section with unique environmental characteristics compared to ordinary roads. The road structure of tunnels is relatively fixed, and design parameters such as lane width and curve radius are not easy to change after construction, which puts special requirements on vehicle speed. In order to ensure the safety and smoothness of traffic in tunnels, it is necessary to set a reasonable driving speed based on these characteristics of tunnels.

[0003] In current traffic management, tunnel driving speed is mainly determined based on tunnel design standards and some conventional traffic rules. Combined with local traffic flow, vehicle type distribution and other conditions, a fixed speed limit value for the tunnel is formulated.

[0004] This speed recommendation method based on fixed design standards and conventional traffic rules lacks real-time and flexibility. It does not fully consider the actual traffic dynamics in the tunnel, resulting in the inability to adjust the existing speed recommendations in time according to special circumstances, which can easily lead to secondary accidents or traffic congestion. Summary of the invention

[0005] In order to solve the problem that the actual traffic dynamics in the tunnel are not fully considered, resulting in the inability to timely adjust the existing speed recommendation according to special circumstances, which is likely to cause secondary accidents or traffic congestion, the present invention provides a tunnel driving speed recommendation method, system, terminal and storage medium.

[0006] In a first aspect, the present invention provides a method for recommending tunnel driving speed, which adopts the following technical solution: A method for recommending tunnel driving speed, comprising the following steps: S1, obtaining tunnel information and vehicle information in the tunnel, wherein the tunnel information includes tunnel length, tunnel road friction and tunnel speed limit, and the vehicle information in the tunnel includes the number of vehicles in the tunnel, the current distance between the vehicle and the preceding vehicle, and the current speed and acceleration of the vehicle; S2, calculating the traffic density in the tunnel and the safe distance between adjacent vehicles according to the tunnel information and the vehicle information in the tunnel; S3 calculates the recommended speed based on tunnel information, traffic density and safety distance, and pushes the recommended speed to vehicles in the tunnel.

[0007] Optionally, in step S2, the traffic density is calculated as:

[0008] in, is the traffic density, N is the number of vehicles, and L is the tunnel length; The safety distance between adjacent vehicles includes reaction distance and braking distance, which is calculated as:

[0009] in, is the safe distance of the vehicle, is the current speed of the vehicle, is the current acceleration of the vehicle, is the driver reaction time of the vehicle.

[0010] Optionally, calculating the recommended speed specifically includes: Calculating a first speed of the vehicle based on tunnel road friction and tunnel speed limit; calculating a second speed of the vehicle based on the traffic density; Obtaining the third speed of the vehicle based on the judgment and analysis of the safety distance and the current distance; The first speed, the second speed and the third speed of the vehicle are sorted in order, and the minimum value among them is obtained as the recommended speed of the vehicle.

[0011] Optionally, the calculation of the first speed includes: Calculate the adjusted speed when the road condition changes:

[0012] in, is the vehicle's normal driving speed. is the vehicle's adjusted speed based on road conditions. is the friction coefficient of normal road surface, is the road friction coefficient of the road the vehicle is currently on; The adjusted speed of the vehicle is compared with the tunnel speed limit. When the adjusted speed is greater than the tunnel speed limit, the first speed is the tunnel speed limit. When the adjusted speed is not greater than the tunnel speed limit, the first speed is the adjusted speed.

[0013] Optionally, the calculation of the second speed includes:

[0014] in, is the second speed, is the traffic density, and q is the number of vehicles per unit distance.

[0015] Optionally, the calculation of the third speed includes: When the calculated safety distance is greater than the current distance,

[0016] in, is the third speed of the vehicle, is the calculated distance of the vehicle; When the safety distance is not greater than the current distance, the current distance is equal to the calculated distance, and the calculated deceleration upper limit is used as the third speed; When the calculated safety distance is less than the current distance, the safety distance is equal to the calculated distance to calculate the safety speed, and the current distance is equal to the calculated distance to calculate the acceleration upper limit, and the third speed is between the safety speed and the acceleration upper limit.

[0017] Optionally, driver reaction time is adjusted for traffic congestion and weather and is calculated as:

[0018] in, is the driver's reaction time of the vehicle under normal circumstances, is the driver's reaction time after a vehicle is affected by weather and / or road conditions. is the additional time affected by weather, is the additional time due to traffic congestion.

[0019] In a second aspect, a tunnel driving speed recommendation system is provided, wherein when the system is executed, the tunnel driving speed recommendation method as described above is applied, including: An information acquisition module, which acquires tunnel information and vehicle information in the tunnel, wherein the tunnel information includes tunnel length, tunnel road friction and tunnel speed limit, and the vehicle information in the tunnel includes the number of vehicles in the tunnel, the current distance between the vehicle and the preceding vehicle, and the current speed and acceleration of the vehicle; An information processing module calculates the traffic density in the tunnel and the safe distance between adjacent vehicles based on the tunnel information and the vehicle information in the tunnel; The speed recommendation module calculates the recommended speed based on tunnel information, traffic density and safety distance, and pushes the recommended speed to vehicles in the tunnel.

[0020] In a third aspect, a tunnel driving speed recommendation terminal is provided, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the memory is coupled to the processor, and the processor implements the tunnel driving speed recommendation method as described above when executing the computer program.

[0021] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the above-mentioned tunnel driving speed recommendation method.

[0022] In summary, the present invention has the following beneficial technical effects: The recommended speed calculated by integrating tunnel information, traffic density and safe distance helps to achieve overall coordination of traffic flow in the tunnel. Vehicles travel at their respective recommended speeds, which can avoid interference with traffic caused by individual vehicles running too fast or too slow, making traffic flow more stable and orderly, and improving overall traffic efficiency. At the same time, it can optimize the use of traffic resources in the tunnel and reduce energy waste and time delays caused by traffic congestion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a flowchart of a method for recommending tunnel driving speed according to an embodiment of the present invention.

[0024] Figure 2 It is a structural schematic diagram of a tunnel driving speed recommendation system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1 -Attached Figure 2 The present invention is described in further detail.

[0026] Example 1 Reference Figure 1 A tunnel driving speed recommendation method of this embodiment includes the following steps: S1, obtaining tunnel information and vehicle information in the tunnel, wherein the tunnel information includes tunnel length, tunnel road friction and tunnel speed limit, and the vehicle information in the tunnel includes the number of vehicles in the tunnel, the current distance between the vehicle and the preceding vehicle, and the current speed and acceleration of the vehicle; From a safety perspective, the length of the tunnel allows drivers to plan their trips reasonably, road conditions prompt drivers to adjust their driving style in advance, tunnel speed limits ensure driving safety, and the distance, speed and acceleration information between vehicles helps drivers avoid collisions and ensure driving safety; from a traffic management perspective, this information helps management departments plan lanes and regulate traffic flow based on vehicle size, number and tunnel characteristics, such as setting up special lanes or adjusting speed limit signs; in terms of traffic efficiency, drivers can choose the right lane based on this information, accurately control the speed, reduce unnecessary lane changes, increase the overall speed of vehicles in the tunnel, reduce detention time, and make traffic in the tunnel more orderly and efficient.

[0027] S2, calculating the traffic density in the tunnel and the safe distance between adjacent vehicles according to the tunnel information and the vehicle information in the tunnel; The traffic density is calculated as:

[0028] in, is the traffic density, N is the number of vehicles, and L is the tunnel length; Traffic density is a key indicator for evaluating the degree of traffic congestion in tunnels. By accurately calculating traffic density, traffic control measures can be taken in a timely manner. For example, when the traffic density is close to saturation, vehicles entering the tunnel entrance can be restricted to avoid serious congestion in the tunnel. At the same time, it also helps to plan reasonable rescue channels, so that rescue vehicles can be quickly dispatched to the scene of the accident when an emergency occurs. For drivers, understanding traffic density can make them mentally prepared in advance, adjust driving speed and following distance, and drive more cautiously when traffic density is high.

[0029] The safety distance between adjacent vehicles includes reaction distance and braking distance, which is calculated as:

[0030] in, is the safe distance of the vehicle, is the current speed of the vehicle, is the current acceleration of the vehicle, is the vehicle's driver reaction time.

[0031] Accurately calculating the safe distance between adjacent vehicles can greatly improve traffic safety in tunnels. For drivers, knowing the safe distance can avoid rear-end collisions, especially when the light, vision and other conditions in the tunnel are relatively special. This also helps to maintain the stability of the traffic flow. When vehicles can maintain a reasonable safe distance, the speed of the entire traffic flow will change more smoothly, reducing behaviors such as sudden braking and sudden acceleration, thereby improving the smoothness and safety of the entire tunnel traffic. For traffic management departments, the reasonable determination of the safe distance can be used as a basis for formulating traffic rules and tunnel management policies. For example, when setting up traffic signs or variable information boards in tunnels, reasonable suggestions for following vehicles can be given based on the safe distance.

[0032] S3 calculates the recommended speed based on tunnel information, traffic density and safety distance, and pushes the recommended speed to vehicles in the tunnel.

[0033] Calculating the recommended speed specifically includes: The first speed of the vehicle is calculated based on the friction of the tunnel road surface and the speed limit of the tunnel; the influence of the characteristics of the tunnel itself on the speed of the vehicle is fully considered. For example, if there is water accumulation or road maintenance in the tunnel, the first speed calculated according to the road conditions will allow the vehicle to travel at a lower and safe speed to avoid dangers such as vehicle loss of control due to excessive speed. The tunnel speed limit is a safe speed limit set based on multiple factors such as the design, ventilation, and lighting of the tunnel. The first speed calculated based on this can ensure that the vehicle does not exceed this safety limit.

[0034] The second speed of the vehicle is calculated based on the traffic density, so that the vehicle speed can adapt to the traffic flow in the tunnel. When the traffic density is large, the vehicle travels at a lower second speed, which can increase the safety distance between vehicles and reduce the occurrence of rear-end collisions. This is because when the traffic density is large, the mutual interference between vehicles increases, and a lower speed helps the driver better deal with emergencies.

[0035] Obtaining the third speed of the vehicle based on the judgment and analysis of the safety distance and the current distance; The first speed, second speed and third speed of the vehicle are sorted and the minimum value is taken as the recommended speed of the corresponding vehicle. This is directly related to the actual spacing safety between vehicles. If the current distance is less than the safe distance, the third speed will be reduced, prompting the vehicle to slow down to avoid collision. This dynamic monitoring of the actual spacing between vehicles and speed adjustment is an important measure to ensure traffic safety in tunnels.

[0036] Comprehensively calculating the three speeds and taking the minimum value as the recommended speed will help achieve overall coordination of traffic flow in the tunnel. Vehicles driving at their respective recommended speeds can prevent individual vehicles from disturbing the traffic flow by driving too fast or too slow. For example, when the traffic density is moderate, if some vehicles blindly drive according to the tunnel speed limit (first speed) without considering the traffic density, they may frequently change lanes and overtake, causing traffic disorder. Driving at the comprehensively calculated recommended speed can make the traffic flow more stable and orderly, and improve the overall traffic efficiency.

[0037] At the same time, it can optimize the use of traffic resources in the tunnel. Through reasonable speed control, unnecessary acceleration and deceleration and parking waiting time of vehicles can be reduced, so that the traffic capacity of the tunnel can be fully utilized. For example, without affecting safety, the traffic flow can pass through the tunnel at a relatively stable speed, reducing energy waste and time delays caused by traffic congestion.

[0038] The calculation of the first speed includes: Calculate the adjusted speed when the road condition changes:

[0039] in, is the vehicle's normal driving speed. is the vehicle's adjusted speed based on road conditions. is the friction coefficient of normal road surface, is the road friction coefficient of the road the vehicle is currently on; The adjusted speed of the vehicle is compared with the tunnel speed limit. When the adjusted speed is greater than the tunnel speed limit, the first speed is the tunnel speed limit. When the adjusted speed is not greater than the tunnel speed limit, the first speed is the adjusted speed.

[0040] The calculation of the second speed includes:

[0041] in, is the second speed, is the traffic density, and q is the number of vehicles per unit distance.

[0042] The calculation of the third speed includes: When the calculated safety distance is greater than the current distance,

[0043] Where, is the third speed of the vehicle, is the calculated distance of the vehicle; When the safety distance is not greater than the current distance, the current distance is equal to the calculated distance, and the calculated deceleration upper limit is used as the third speed; When the calculated safety distance is less than the current distance, the safety distance is equal to the calculated distance to calculate the safety speed, and the current distance is equal to the calculated distance to calculate the acceleration upper limit, and the third speed is between the safety speed and the acceleration upper limit.

[0044] Driver reaction time is adjusted for traffic congestion and weather and is calculated as:

[0045] in, is the driver's reaction time of the vehicle under normal circumstances, is the driver's reaction time after a vehicle is affected by weather and / or road conditions. is the additional time affected by weather, is the additional time due to traffic congestion.

[0046] Example 2 Reference Figure 2 The difference between this embodiment and embodiment 1 is that this embodiment provides a tunnel driving speed recommendation system, and when the system is executed, the tunnel driving speed recommendation method as described above is applied, including: An information acquisition module, which acquires tunnel information and vehicle information in the tunnel, wherein the tunnel information includes tunnel length, tunnel road friction and tunnel speed limit, and the vehicle information in the tunnel includes the number of vehicles in the tunnel, the current distance between the vehicle and the preceding vehicle, and the current speed and acceleration of the vehicle; An information processing module calculates the traffic density in the tunnel and the safe distance between adjacent vehicles based on the tunnel information and the vehicle information in the tunnel; The speed recommendation module calculates the recommended speed based on tunnel information, traffic density and safety distance, and pushes the recommended speed to vehicles in the tunnel.

[0047] Example 3 The difference between this embodiment and Embodiment 1 is that this embodiment provides a tunnel driving speed recommendation terminal, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the memory is coupled to the processor, and the processor implements the tunnel driving speed recommendation method as described above when executing the computer program.

[0048] Example 4 The difference between this embodiment and embodiment 1 is that this embodiment provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the tunnel driving speed recommendation method as described above.

[0049] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. As for the method disclosed in the embodiment, since it corresponds to the system disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0050] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0051] The above disclosure is only a preferred embodiment of the present invention, but the present invention is not limited thereto. Any non-creative changes that can be thought of by a person skilled in the art, as well as several improvements and modifications made without departing from the principle of the present invention, should fall within the protection scope of the present invention.

Claims

1. A method for recommending tunnel driving speed, characterized in that: The following steps are involved: S1, obtaining tunnel information and vehicle information in the tunnel, wherein the tunnel information includes tunnel length, tunnel road friction and tunnel speed limit, and the vehicle information in the tunnel includes the number of vehicles in the tunnel, the current distance between the vehicle and the preceding vehicle, and the current speed and acceleration of the vehicle; S2, calculating the traffic density in the tunnel and the safe distance between adjacent vehicles according to the tunnel information and the vehicle information in the tunnel; S3 calculates the recommended speed based on tunnel information, traffic density and safety distance, and pushes the recommended speed to vehicles in the tunnel.

2. The method for recommending tunnel driving speed according to claim 1, characterized in that: In step S2, the traffic density is calculated as: in, is the traffic density, N is the number of vehicles, and L is the tunnel length; The safety distance between adjacent vehicles includes reaction distance and braking distance, which is calculated as: in, is the safe distance of the vehicle, is the current speed of the vehicle, is the current acceleration of the vehicle, is the driver reaction time of the vehicle.

3. The method for recommending tunnel driving speed according to claim 2, characterized in that: In step S3, calculating the recommended speed specifically includes: Calculating a first speed of the vehicle based on tunnel road friction and tunnel speed limit; calculating a second speed of the vehicle based on the traffic density; Obtaining the third speed of the vehicle based on the judgment and analysis of the safety distance and the current distance; The first speed, the second speed and the third speed of the vehicle are sorted in order, and the minimum value among them is obtained as the recommended speed of the vehicle.

4. The method for recommending tunnel driving speed according to claim 3, characterized in that: The calculation of the first speed includes: Calculate the adjusted speed when the road condition changes: in, is the vehicle's normal driving speed. is the vehicle's adjusted speed based on road conditions. is the friction coefficient of normal road surface, is the road friction coefficient of the road the vehicle is currently on; The adjusted speed of the vehicle is compared with the tunnel speed limit. When the adjusted speed is greater than the tunnel speed limit, the first speed is the tunnel speed limit. When the adjusted speed is not greater than the tunnel speed limit, the first speed is the adjusted speed.

5. The method for recommending tunnel driving speed according to claim 3, characterized in that: The calculation of the second speed includes: in, is the second speed, is the traffic density, and q is the number of vehicles per unit distance.

6. The method for recommending tunnel driving speed according to claim 3, characterized in that: The calculation of the third speed includes: When the calculated safety distance is greater than the current distance, in, is the third speed of the vehicle, is the calculated distance of the vehicle; When the safety distance is not greater than the current distance, the current distance is equal to the calculated distance, and the calculated deceleration upper limit is used as the third speed; When the calculated safety distance is less than the current distance, the safety distance is equal to the calculated distance to calculate the safety speed, and the current distance is equal to the calculated distance to calculate the acceleration upper limit, and the third speed is between the safety speed and the acceleration upper limit.

7. The method for recommending tunnel driving speed according to any one of claims 2 to 6, characterized in that: Driver reaction time is adjusted for traffic congestion and weather and is calculated as: in, is the driver's reaction time of the vehicle under normal circumstances, is the driver's reaction time after a vehicle is affected by weather and / or road conditions. is the additional time affected by weather, is the additional time due to traffic congestion.

8. A tunnel driving speed recommendation system, characterized in that: When the system is executed, the tunnel driving speed recommendation method according to claims 1 to 7 is applied, including: An information acquisition module, which acquires tunnel information and vehicle information in the tunnel, wherein the tunnel information includes tunnel length, tunnel road friction and tunnel speed limit, and the vehicle information in the tunnel includes the number of vehicles in the tunnel, the current distance between the vehicle and the preceding vehicle, and the current speed and acceleration of the vehicle; An information processing module calculates the traffic density in the tunnel and the safe distance between adjacent vehicles based on the tunnel information and the vehicle information in the tunnel; The speed recommendation module calculates the recommended speed based on tunnel information, traffic density and safety distance, and pushes the recommended speed to vehicles in the tunnel.

9. A tunnel speed recommendation terminal, characterized in that: The invention comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the memory is coupled to the processor, and when the processor executes the computer program, the method for recommending tunnel driving speed according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the tunnel driving speed recommendation method according to any one of claims 1 to 7.

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