Method, system and storage medium for controlling safe driving distance of transport vehicles considering the temperature change of road surface on downhill section of bridge

Abstract

The present application discloses a method, system and storage medium for controlling the safe driving distance of transport vehicles taking into account the temperature change of the road surface on a downhill section of a bridge, including the following contents: obtaining the road surface temperature of the downhill section of the bridge; reading the air mass density according to the temperature of the day; collecting the license plate number, vehicle height, vehicle width, vehicle weight, vehicle position, speed and the distance between the vehicle and the vehicle in front of the vehicle entering the bridge section; calculating the safe distance, and comparing the distance between the vehicle and the vehicle in front with the safe distance; the present application aims at the problem that the large temperature difference of the road surface on the downhill section of the bridge leads to a large change in the road surface friction coefficient, which is difficult for the transport vehicle driver to detect. According to basic data such as vehicle parameters, climate and environmental parameters, and road environmental parameters, the safe distance between the transport vehicle and the vehicle in front on the downhill section of the bridge is calculated in real time, and the transport vehicle is guided to maintain a safe distance from the vehicle in front on the downhill section of the bridge, so as to achieve the goal of ensuring the safe driving of the transport vehicle.

Description

Technical Field

[0001] The present application relates to the field of traffic safety technology, and in particular to a method, system and storage medium for controlling the safe driving distance of a transport vehicle taking into account the temperature change of a road surface on a downhill section of a bridge. Background Art

[0002] With the rapid development of the transportation industry, bridges, as important infrastructure connecting different regions, are receiving increasing attention for their safety. Especially on the downhill section of the bridge, vehicles are prone to lose control due to the relatively high speed, which poses a great safety hazard to vehicle driving. Currently, when transport vehicles are going downhill on bridges, they often rely on the driver's experience and intuition to control the speed and distance between vehicles. However, this method cannot cope with the complex and changing road environment.

[0003] Regarding the topic of safe driving distance, there are some vehicle safety assistance systems in the existing technology, such as anti-collision warning systems and adaptive cruise control systems, but most of these systems focus on the control of a single factor, such as speed or distance, and ignore the comprehensive impact of road temperature, climate environment and vehicle parameters on safe driving distance. Secondly, most existing technologies calculate road friction as a fixed value, without considering that changes in road friction coefficient will directly affect the vehicle's braking performance and driving stability.

[0004] Therefore, there is an urgent need for a technical solution that can comprehensively consider multiple factors such as vehicle parameters, climate environment parameters, road environment parameters, etc., and measure and control the safe distance between the transport vehicle and the vehicle in front on the downhill section of the bridge in real time, so as to ensure the safe driving of the transport vehicle on this section. Summary of the invention

[0005] Purpose of the invention: In response to the problems existing in the prior art, the present application proposes a method, system and storage medium for controlling the safe driving distance of transport vehicles that takes into account the temperature changes of the pavement on the downhill section of the bridge, so as to reduce the risk of collision on the downhill section of the bridge with large temperature differences.

[0006] In the first aspect, the present application provides a method for controlling the safe driving distance of transport vehicles taking into account the temperature change of the road surface on the downhill section of the bridge, defining the highest point of the bridge as the starting point of the downhill section of the bridge, and extending downstream from the connection between the bridge and the road surface. m Meters is the end point of the downhill section of the bridge; including the following:

[0007] S1, get the downhill section of the bridge k Road surface temperature at each test point T k ;

[0008] S2: When a transport vehicle is detected entering the downhill section of the bridge, the license plate number of the transport vehicle is identified and the height of the transport vehicle is collected. h ,width w ,weight W ;

[0009] S3, obtain the speed of the transport vehicle V ,Location x and the distance to the vehicle in front D ;

[0010] S4, based on the corresponding relationship between air mass density and temperature, read the air mass density according to the temperature of the day ; According to the location of the transport vehicle x Determine the nearest detection point and read the road surface temperature corresponding to the nearest detection point T k and slope i k ; According to the corresponding relationship between the road friction coefficient and the road temperature, read the position of the transport vehicle x Friction coefficient of the road surface f T ;

[0011] S5, real-time calculation of the safe distance that the transport vehicle should maintain with the vehicle in front D s , and compare it with the measured distance D between the transport vehicle and the vehicle in front; if the distance D between the transport vehicle and the vehicle in front is less than the calculated safety distance D s , a speed control instruction is generated and sent to the driver, otherwise no instruction is sent; the safety distance calculation formula is as follows:

[0012] ;

[0013] S6, location of the vehicle to be transported x After updating, re-execute S4 and S5.

[0014] In a possible implementation of the first aspect, the correspondence between the road friction coefficient of the downhill section of the bridge and the road surface temperature, the correspondence between the air mass density and the air temperature, and the slope of each detection point are stored in an information database.

[0015] In a possible implementation manner of the first aspect, the corresponding relationship between the road surface friction coefficient and the road surface temperature is obtained in the following manner:

[0016] A friction coefficient meter is used to sample the road surface of the downhill section of the bridge to obtain the friction coefficient corresponding to different road surface temperatures when the road surface of the downhill section of the bridge is not frozen, and the friction coefficient is saved in the information database; the road surface temperature range is -15°C to 70°C, with an interval of 1°C.

[0017] In a possible implementation manner of the first aspect, the corresponding relationship between the air mass density and the temperature is obtained in the following manner:

[0018] The air mass density corresponding to different local temperatures is collected and saved in the information database; the temperature range is the lowest temperature to the highest temperature in the local area in the past five years, with an interval of 1°C.

[0019] In a possible implementation of the first aspect, the slope of each detection point on the downhill section of the bridge is obtained in the following manner:

[0020] Define the starting point of the downhill section of the bridge as the first detection point, and the end point of the downhill section of the bridge as the last detection point; starting from the starting point, along the driving direction to the end point, including K detection points, determine the interval between adjacent detection points, and use the slope detector to obtain the slope of each detection point i k , and save it to the information library, k =1,2,...,K.

[0021] In a second aspect, the present application provides a system for executing the method for controlling the safe driving distance of a transport vehicle, comprising:

[0022] Pavement temperature detection device, used to obtain the temperature of the downhill section of the bridge k The road surface temperature T at each detection point k , and sent to the data center;

[0023] Video detection device, used to identify or collect the license plate number and vehicle height of vehicles entering the bridge section h and vehicle width w , and sent to the data center;

[0024] Weight detection device, used to collect the weight of vehicles entering the bridge section W , and sent to the data center;

[0025] On-board device for collecting vehicle location x ,speed V , the distance between the vehicle and the front vehicle D , sent to the data center, and received the speed control command issued by the data center, and informed the driver through the in-car voice broadcast;

[0026] Data center, used to receive and store the data collected and transmitted by the above devices, and calculate the safe distance D s , generate release speed control instructions;

[0027] The networked joint control device is used to ensure the information transmission between the data center and the road surface temperature detection device, video detection device, weight detection device, and vehicle-mounted device.

[0028] In a possible implementation of the second aspect, the data center includes an information database for storing the corresponding relationship between the road friction coefficient of the downhill section of the bridge and the change of road surface temperature, the corresponding relationship between the change of air mass density and air temperature, and the slope of each detection point.

[0029] In a possible implementation manner of the second aspect, the video detection device is installed at a starting position of a downhill section of the bridge.

[0030] In a possible implementation manner of the second aspect, the weight detection device is installed on a horizontal road surface upstream of a starting position of a downhill section of the bridge.

[0031] In a third aspect, the present application provides a computer-readable storage medium, wherein the storage medium stores at least one executable instruction, and when the executable instruction is executed on an electronic device, the electronic device executes the method for controlling the safe driving distance of a transport vehicle.

[0032] Compared with the existing methods, this application has the following beneficial effects:

[0033] This application takes the control of the safe distance between the front and rear vehicles as the goal from the perspective of road surface temperature changes, and provides a safe distance control solution for transport vehicles on downhill sections of bridges with large temperature differences. Based on basic data such as vehicle parameters, climate environment parameters, and road parameters, this application calculates the safe distance that should be maintained between the transport vehicle and the vehicle in front, and guides vehicles to drive safely on downhill sections of bridges with large temperature differences, which is beneficial to vehicle platoon control, reduces the risk of traffic collisions, and improves operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a flow chart of a method for controlling a safe driving distance of a transport vehicle taking into account the temperature change of a road surface on a downhill section of a bridge in one embodiment of the present application;

[0035] Figure 2 This is a schematic diagram of the installation position of a device for a safe distance control system for transport vehicles that takes into account the temperature change of the road surface on a downhill section of a bridge in one embodiment of the present application;

[0036] Figure 3 A curve diagram showing the change of the safety distance of a large freight vehicle on roads with different temperatures in one embodiment of the present application;

[0037] Explanation of the accompanying drawings: 1. Temperature detection device; 2. Video detection device; 3. Weight detection device; 4. Vehicle-mounted device; 5. Networked joint control device. DETAILED DESCRIPTION

[0038] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0039] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0040] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application are also intended to include plural forms, unless the context clearly indicates other meanings.

[0041] In addition, in the present application, directional terms such as "upper" and "lower" are defined relative to the orientation of the device in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the changes in the orientation of the components in the drawings.

[0042] First, the present application proposes a method for controlling the safe driving distance of transport vehicles taking into account the temperature change of the road surface on the downhill section of the bridge, defining the starting point of the downhill section of the bridge as the highest point of the bridge and the end point as the downstream extension of the connection between the bridge and the road surface. m Meters.

[0043] This embodiment selects the Chaotianmen Yangtze River Bridge section (Chongqing City) as an example. The total length of the line is 1,741 meters and the main span is 552 meters long. The upper layer of the bridge deck is a two-way 6-lane main road Class I highway with an arch bridge structure. The end point is selected as 200 meters downstream from the connection between the bridge and the road surface.

[0044] See also Figure 1 , including the following steps:

[0045] S1, get the downhill section of the bridge k Road surface temperature at each test point T k ;

[0046] S2: When a transport vehicle is detected entering the downhill section of the bridge, the license plate number of the transport vehicle is identified and the height of the transport vehicle is collected. h ,width w ,weight W ;

[0047] S3, obtain the speed of the transport vehicle V ,Location x and the distance to the vehicle in frontD ;

[0048] S4, based on the corresponding relationship between air mass density and temperature, read the air mass density according to the temperature of the day ; According to the location of the transport vehicle x Determine the nearest detection point and read the road surface temperature corresponding to the nearest detection point T k and slope i k ; According to the corresponding relationship between the road friction coefficient and the road temperature, read the position of the transport vehicle x Friction coefficient of the road surface f T ;

[0049] S5, real-time calculation of the safe distance that the transport vehicle should maintain with the vehicle in front D s , and compare it with the measured distance D between the transport vehicle and the vehicle in front; if the distance D between the transport vehicle and the vehicle in front is less than the calculated safety distance D s , a speed control command is generated and sent to the driver, otherwise no command is sent;

[0050] The formula for calculating the safety distance is as follows:

[0051] ;

[0052] S6, location of the vehicle to be transported x After updating, re-execute S4 and S5.

[0053] Among them, the corresponding relationship between the friction coefficient of the road surface of the downhill section of the bridge and the change of the road surface temperature, the corresponding relationship between the change of the air mass density and the temperature, and the slope of each position of the downhill section of the bridge are stored in the information database.

[0054] Specifically, the corresponding relationship between the road friction coefficient and the road temperature includes the following:

[0055] Use a friction coefficient measuring instrument to sample the road surface of the downhill section of the bridge to obtain the friction coefficient corresponding to different temperatures when the road surface of the downhill section of the bridge is not frozen. The friction coefficient can be made into a table and saved in the information database; the first line of the table is the temperature, and the temperature range is preferably -15℃ to 70℃, with an interval of 1℃; the second line of the table is the friction coefficient f corresponding to different temperatures T , keep 3 decimal places, and the table should be updated once a year.

[0056] The corresponding relationship between the storage air mass density and the temperature change includes the following:

[0057] The air mass density corresponding to different local temperatures can be obtained and made into a table and saved in the information database; the first line of the table is the temperature, and the temperature range is preferably from the lowest temperature to the highest temperature in the local area in the past five years, with an interval of 1°C; the second line of the table is the air mass density corresponding to different temperatures , unit is kg / m 3 , retain 2 decimal places.

[0058] The slope of each position on the downhill section of the bridge is obtained in the following way:

[0059] The starting position of the downhill section of the bridge is set as the first detection point (k=1), and K monitoring points are included in the driving direction. The last detection point is the end position of the downhill section of the bridge (k=K). The detection interval is set to 20 meters, k=1,2,...,K; the slope detector is used to obtain the slope of each detection point i k .

[0060] In a second aspect, the present application also provides a system for executing the above-mentioned vehicle driving safety distance control. In this embodiment, the transport vehicle driving safety distance control system that takes into account the temperature change of the road surface on the downhill section of the bridge is applied to Figure 2 On the downhill road side of the bridge shown in the figure, the system consists of a temperature detection device 1, a video detection device 2, a weight detection device 3, a vehicle-mounted device 4, a networked joint control device 5 and a data center.

[0061] The temperature detection device 1 is installed at each detection point k on the downhill section of the bridge, with an installation interval of 20 meters, to obtain the temperature of the downhill section of the bridge. k The road surface temperature T at each detection point k , and sent to the data center;

[0062] The video detection device 2 is installed at the starting position of the downhill section of the bridge to identify or collect the license plate number and vehicle height of the vehicle entering the bridge section. h and vehicle width w , and sent to the data center;

[0063] The weight detection device 3 is installed on the horizontal road surface upstream of the starting position of the downhill section of the bridge, and is used to collect the weight of the vehicle entering the bridge section. W , and sent to the data center;

[0064] The vehicle-mounted device 4 is installed on the vehicle and is used to collect the vehicle position. x ,speed V , the distance between the vehicle and the front vehicle D , sent to the data center, and received the speed control command issued by the data center, and informed the driver through the in-car voice broadcast;

[0065] The networked joint control device 5 is installed at the starting position of the downhill section of the bridge to ensure the information transmission between the data center and the road surface temperature detection device, video detection device, weight detection device, and vehicle-mounted device;

[0066] The data center is established at the traffic command center to receive and store the data collected by the above devices and calculate the safe distance. D s , and generate release speed control instructions.

[0067] Furthermore, the data center includes an information database for storing the corresponding relationship between the friction coefficient of the road surface of the downhill section of the bridge and the change of the road surface temperature, the corresponding relationship between the change of the air mass density and the temperature, and the slope of each detection point.

[0068] In this embodiment, the height of the target vehicle is obtained by detecting the video detection device, the weight detection device, and the vehicle-mounted device. h 1.7m, width w 1.8m, weight W 1700kg, speed V is 45km / h, the vehicle is closest to the 10th detection point, and the distance between it and the vehicle in front is D It is 82m.

[0069] In this embodiment, the temperature on that day is -1°C. The data center reads the air mass density according to the corresponding relationship between the air mass density and the temperature and the temperature on that day. 1.29kg / m 3 , read the road surface temperature at the nearest detection point (k=10) according to the vehicle position T 10 0℃, slope i 10 =-3%. According to the corresponding relationship between the road friction coefficient and the road temperature, the road friction coefficient f at the vehicle position is read. 0℃ It is 0.81.

[0070] Substitute the above parameters into the safe distance calculation formula to calculate the safe distance that the vehicle should maintain with the vehicle in front in real time. D s It is 95m. After comparison, it can be known that the distance between the vehicle and the vehicle in front is less than the safe distance. The data center generates a speed control instruction and sends it to the on-board device through the networked joint control device. The on-board device receives the speed control instruction and generates a voice broadcast to remind the driver. The voice broadcast can be prompts such as "Please slow down and keep a safe distance".

[0071] When the data center obtains the updated vehicle position, it re-acquires new parameters and calculates a new safety distance so that the safety distance can adapt to changes in current vehicle parameters, climate environment parameters, and road parameters.

[0072] In another embodiment of the present application, taking a highway with an average structural depth of 0.45 mm as an example, the road surface friction coefficient f T The corresponding relationship with the change of road surface temperature T is shown in the following table:

[0073] Table 1 Friction coefficient f of a highway road surface T Corresponding relationship with road surface temperature

[0074] Road surface temperature T (℃) <![CDATA[Coefficient of friction f T > -10 0.61 -8 0.6 -6 0.59 -4 0.6 -2 0.61 0 0.62 2 0.63 4 0.64 6 0.65 8 0.66 10 0.68 12 0.68

[0075] In this embodiment, the target vehicle is a large freight vehicle with a weight W of 31000kg, a height h of 4m, a width w of 2.55m, and a speed V of 60km / h. The temperature on that day was -1°C, and the air mass density is 1.29kg / m3; assuming that the starting road surface temperature of the downhill section of the bridge is -10℃ and the slope is -4%; the ending road surface temperature is 6℃ and the slope is 0%. The temperature and slope change evenly from the starting point to the end point. Use EXCEL to model and analyze, and calculate the change of the safe distance between the target vehicle and the preceding vehicle under different road surface temperature conditions through the safe distance calculation formula, such as Figure 3 The following table shows the corresponding safety distance of the target vehicle under different road surface temperatures;

[0076] The results show that changes in road surface temperature significantly affect changes in vehicle safety distance, indicating that even on the same road, temperature inconsistencies can lead to different safety distances. Therefore, road surface temperature changes should be considered during driving to reasonably adjust the distance to the vehicle ahead and ensure driving safety.

[0077] The present application also provides a computer-readable storage medium on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the method in the above embodiment is implemented;

[0078] For example, it can be achieved Figure 1 The steps of the method for controlling the safe driving distance of transport vehicles considering the change in road surface temperature on the downhill section of the bridge are shown in FIG.

[0079] Computer readable storage media can be tangible devices that can hold and store instructions used by instruction execution devices. Computer readable storage media can be, for example, but not limited to, electronic storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the above.

[0080] The computer program instructions used to perform the operations of the present application may be source code or object code written in any combination of one or more programming languages, and the computer-readable program instructions may be executed completely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or completely on a remote computer or server. The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable technicians familiar with the technical field to understand the content of the present application and implement it accordingly, and they cannot be used to limit the scope of protection of the present application. For ordinary technicians in the technical field, without departing from the principles of the present application, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for controlling the safe driving distance of transport vehicles considering the temperature change of the road surface on the downhill section of a bridge, wherein the highest point of the bridge is defined as the starting point of the downhill section of the bridge, and the point extending downstream from the connection between the bridge and the road surface is defined as the end point of the downhill section of the bridge; characterized in that: Includes the following: S1, obtain the road surface temperature T of the kth detection point on the downhill section of the bridge k ; S2, when a transport vehicle is detected entering the downhill section of the bridge, the license plate number of the transport vehicle is identified, and the height h, width w, and weight W of the transport vehicle are collected; S3, obtaining the speed V, position x and distance D between the transport vehicle and the preceding vehicle; S4, based on the corresponding relationship between air mass density and temperature, read the air mass density according to the temperature of the day ; Determine the nearest detection point according to the location x of the transport vehicle, and read the road surface temperature T corresponding to the nearest detection point k and slope i k ; According to the corresponding relationship between the road friction coefficient and the road temperature, read the road friction coefficient f of the transport vehicle at position x T ; S5, real-time calculation of the safe distance D that the transport vehicle should maintain with the vehicle in front s , and compare it with the measured distance D between the transport vehicle and the vehicle ahead; If the distance D between the transport vehicle and the vehicle ahead is less than the calculated safety distance D s , a speed control instruction is generated and sent to the driver, otherwise no instruction is sent; the safety distance calculation formula is as follows: ； S6, after the position x of the transport vehicle is updated, re-execute S4 and S5.

2. The method for controlling the safe driving distance of a transport vehicle according to claim 1, characterized in that: The corresponding relationship between the friction coefficient of the road surface of the downhill section of the bridge and the change of the road surface temperature, the corresponding relationship between the change of the air mass density and the temperature, and the slope of each detection point are stored in the information database.

3. The method for controlling the safe driving distance of a transport vehicle according to claim 2, characterized in that: The corresponding relationship between the road surface friction coefficient and the road surface temperature is obtained by the following method: A friction coefficient meter is used to sample the road surface of the downhill section of the bridge to obtain the friction coefficient corresponding to different road surface temperatures when the road surface of the downhill section of the bridge is not frozen, and the friction coefficient is saved in the information database; the road surface temperature range is -15°C to 70°C, with an interval of 1°C.

4. The method for controlling the safe driving distance of a transport vehicle according to claim 2, characterized in that: The corresponding relationship between the air mass density and the temperature is obtained by the following method: The air mass density corresponding to different local temperatures is collected and saved in the information database; the temperature range is the lowest temperature to the highest temperature in the local area in the past five years, with an interval of 1°C.

5. The method for controlling the safe driving distance of a transport vehicle according to claim 2, characterized in that: The slope of each detection point on the downhill section of the bridge is obtained by the following method: Define the starting point of the downhill section of the bridge as the first detection point, and the end point of the downhill section of the bridge as the last detection point; starting from the starting point, along the driving direction to the end point, including K detection points, determine the interval between adjacent detection points, and use the slope detector to obtain the slope i of each detection point k , and save it to the information database, k=1,2,...,K.

6. A system for executing the method for controlling the safe driving distance of a transport vehicle as claimed in any one of claims 1 to 5, characterized in that: include: The road surface temperature detection device is used to obtain the road surface temperature T of the kth detection point on the downhill section of the bridge. k , and sent to the data center; A video detection device is used to identify or collect the license plate number, vehicle height h and vehicle width w of the vehicle entering the bridge section, and send it to the data center; A weight detection device is used to collect the weight W of the vehicle entering the bridge section and send it to the data center; The vehicle-mounted device is used to collect the vehicle position x, speed V, and the distance D between the vehicle and the vehicle in front, and send them to the data center, and receive the speed control command issued by the data center, and inform the driver through the voice broadcast in the vehicle; Data center, used to receive and store the data collected and transmitted by the above devices, and calculate the safe distance D s , generate release speed control instructions; The networked joint control device is used to ensure the information transmission between the data center and the road surface temperature detection device, video detection device, weight detection device, and vehicle-mounted device.

7. The system according to claim 6, characterized in that The data center includes an information base for storing the corresponding relationship between the friction coefficient of the road surface of the downhill section of the bridge and the change of the road surface temperature, the corresponding relationship between the change of the air mass density and the temperature, and the slope of each detection point.

8. The system according to claim 6, characterized in that The video detection device is installed at the starting position of the downhill section of the bridge.

9. The system according to claim 6, characterized in that The weight detection device is installed on the horizontal road surface upstream of the starting position of the downhill section of the bridge.

10. A computer-readable storage medium, characterized in that: The storage medium stores at least one executable instruction. When the executable instruction is executed on the electronic device, the electronic device executes the method for controlling the safe driving distance of a transport vehicle as claimed in any one of claims 1 to 5.

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