CN104900056A - Traffic situation sensing method and system of vehicle-road cooperation type - Google Patents

Abstract

The present invention provides a method and system for vehicle-road coordinated traffic situation awareness. The method includes: the vehicle obtains information such as its own position and vehicle speed; the vehicle obtains the vehicle information of other vehicles around it through short-distance wireless communication, and sends its own comprehensive vehicle information ; Set up wireless hotspots on the road and interconnect them. Vehicles passing through the hotspots connect to the hotspots and realize data interaction with the traffic control center, receive road condition information broadcast by the hotspots, and send vehicle information to the hotspots; vehicles can calculate local traffic by integrating all vehicle information obtained by themselves The traffic control center can calculate the global traffic situation by integrating all the vehicle information in the global scope obtained by itself. In this way, both the vehicle itself and the traffic control center can realize real-time perception of the traffic situation.

Description

A traffic situation awareness method and system for vehicle-road coordination

technical field

The invention relates to the field of intelligent transportation, in particular to a method and system for vehicle-road coordination traffic situation awareness.

Background technique

Traffic situation awareness is an important research content in the field of intelligent transportation. Its purpose includes obtaining real-time road traffic conditions and finding out the reasons for road congestion. Especially when congestion occurs, it is very important for the traffic control department and other traffic participants to perceive the congestion situation and the cause of the congestion at the first time.

It is relatively easy to realize traffic situation awareness, because there are traffic participants on the scene when any traffic jam occurs, but how to quickly and effectively transmit this information to the traffic control center and to the rear traffic participants is a difficult problem. Vehicle-road coordination technology can realize the transmission of the above information, but due to the scope and cost of road installation, it is impossible to cover any position on the road.

In order to enable the traffic participants in the rear to quickly and intelligently perceive the traffic situation in front, and to enable the traffic control center to obtain the traffic situation at the first time, the present invention provides a method and system for vehicle-road coordinated traffic situation awareness.

Contents of the invention

The invention provides a traffic situation awareness method for vehicle-road coordination, which can obtain the traffic situation at the first time for the rear traffic participants and the traffic control center.

In order to achieve the above object, the present invention provides a method for vehicle-road coordination traffic situation awareness, the method comprising:

The vehicle obtains information such as its own position and speed;

The vehicle obtains the vehicle information of other vehicles around;

The vehicle periodically sends comprehensive vehicle information;

Wireless hotspots are set up on the road and interconnected, and vehicles passing through the hotspots connect to the hotspots;

The vehicle connected to the hotspot receives the road condition information broadcast by the hotspot, and sends the vehicle information to the hotspot;

The vehicle calculates the local traffic situation;

The traffic control center calculates the global traffic situation.

The vehicle obtains information such as its own position and speed, including:

The vehicle obtains the current position and time of its own vehicle in real time through the on-board positioning device;

The vehicle estimates the speed of its own vehicle through the position and time acquired multiple times.

The vehicle acquires vehicle information of other vehicles around, including:

The vehicle establishes a temporary wireless data link with surrounding vehicles through short-range wireless communication technology;

The vehicle receives comprehensive vehicle information sent by all surrounding vehicles through the temporary wireless data link, and the comprehensive vehicle information includes its own vehicle information and other vehicle information processed by it;

The vehicle information includes information such as vehicle identification, vehicle speed, location, time, and road condition phrases;

The vehicle identification is a unique identification of a vehicle and an identification for distinguishing vehicles.

Preferably, the road condition phrase may be a code representing the road condition.

The vehicle obtains the vehicle information of other vehicles around, and also includes:

When the vehicle passes a wireless hotspot on the road and establishes a connection with the hotspot, it will receive the road condition information broadcast by the hotspot;

The road condition information is comprehensive information processed by the traffic control center, including vehicle information and other information describing the road condition.

The vehicle periodically sends comprehensive vehicle information, including:

The vehicle merges all received vehicle information;

The vehicle forms comprehensive vehicle information on the vehicle information in its forward direction and sends it to the outside world.

The external sending includes:

The vehicle regularly sends out comprehensive vehicle information through the temporary wireless data link;

When a vehicle passes a wireless hotspot on a wireless road and establishes a connection with the hotspot, it sends comprehensive vehicle information to the hotspot.

Preferably, the vehicle forms comprehensive vehicle information from the vehicle information in its own direction, including:

Only select the vehicle information within a certain distance from itself;

Only select the vehicle information in the same direction as your own;

Only select vehicle information within a certain range from the current moment.

Preferably, the vehicle forms comprehensive vehicle information on the vehicle information in its own direction, which also includes:

The length of comprehensive vehicle information will be controlled within a certain range;

All ranges can be set.

Wireless hotspots are set up on the road and interconnected, and vehicles passing through the hotspots are connected to the hotspots, including:

Set up wireless hotspots at important points on the road;

Wireless hotspots are connected to each other through existing methods to form a road network;

The traffic control center is connected to the road network through existing methods;

Vehicles passing through the hotspot will actively connect to the hotspot and establish a vehicle-road wireless link;

The hotspot is an access point for wireless network connection.

The vehicle connected to the hotspot receives the road condition information broadcast by the hotspot, and sends vehicle information to the hotspot, including:

Vehicles that have established vehicle-road wireless links with road hotspots receive road condition information broadcast by hotspots; send their own comprehensive vehicle information to hotspots;

The traffic control center receives vehicle information sent by vehicles connected to the hotspot from the road network, and sends relevant traffic situation information near the hotspot to the vehicles at the hotspot through the road network.

Preferably, the vehicle connected to the hotspot receives the road condition information broadcast by the hotspot, and sends the vehicle information to the hotspot, further comprising:

Vehicles can selectively ask for road condition information ahead, and hotspot answers;

The hotspot can selectively inquire about relevant vehicle information, and the vehicle responds;

The hotspot response may be a response from the traffic management center system at the hotspot.

The vehicle calculates a local traffic situation, including:

The vehicle merges all received vehicle information;

Vehicles form a local traffic situation relative to themselves.

The traffic management center calculates the global traffic situation, including:

The traffic management center merges all vehicle information received globally;

The traffic control center forms a global traffic situation including the driving speed, average speed, and congested road sections of vehicles in the global range.

In order to achieve the above object, the present invention also provides a vehicle-road coordinated traffic situation awareness system, the system comprising:

Vehicle on-board systems, used to determine, process and send and receive vehicle information, user input and display, etc.;

Road network system, used for the construction of road network and wireless hotspots;

The traffic control center system is used for data processing of the traffic control center.

The on-board system of the vehicle includes:

The vehicle obtains the current position and time of its own vehicle in real time;

The vehicle estimates the speed of its own vehicle through the position and time obtained multiple times;

The vehicle establishes a temporary wireless data link with surrounding vehicles through short-range wireless communication technology;

The vehicle receives the vehicle information of the surrounding vehicles through the temporary wireless data link;

The vehicle accepts user input, forms comprehensive vehicle data, and sends it to surrounding vehicles through a temporary wireless data link;

The vehicle displays traffic information.

The road network system includes:

Install wireless hotspots at important points on the road;

Wireless hotspots are interconnected through existing network technology to form a road network;

The traffic control center system is connected to the road network;

Pass the vehicle within the range of the hotspot to establish a connection with the hotspot;

Vehicles that establish a connection with the hotspot send vehicle comprehensive information to the network and receive road condition information released by the network.

The traffic management center system includes:

Receive comprehensive vehicle information issued by vehicles passing through wireless hotspots;

Synthesize all vehicle information and road condition information to form global traffic and road condition information;

Generate and distribute road condition information related to the area to vehicles at wireless hotspots.

The vehicle-road coordinated traffic situation awareness system provided by the present invention senses the vehicle's own position and speed, and senses other vehicle information through data sharing and aggregation, and transmits it to the traffic control center in places with wireless hotspots; the traffic control center can also send Vehicles release road condition information; the traffic control center can grasp the overall traffic situation in real time, and individual vehicles can also know the local traffic situation, so as to realize the traffic situation awareness of vehicle-road coordination.

The beneficial effects of the present invention include:

1. Through data sharing and aggregation, vehicles can perceive and obtain local traffic information ahead;

2. The traffic management center can obtain these local traffic information of vehicles through wireless hotspots, thereby forming a global traffic situation; and the traffic management center can notify vehicles of road condition information in real time, realizing traffic situation awareness of vehicle-road coordination.

Description of drawings

FIG. 1 is a schematic diagram of a vehicle-road coordinated traffic situation awareness method provided by Embodiment 1 of the present invention.

FIG. 2 is a schematic diagram of a vehicle-road coordinated traffic situation awareness system provided by Embodiment 2 of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples.

Embodiment one

FIG. 1 is a schematic diagram of a method for vehicle-road coordination traffic situation awareness according to Embodiment 1 of the present invention. As shown in Figure 1, the method includes the following steps.

101. The vehicle obtains information such as the position and speed of its own vehicle;

Using GPS, Beidou and other satellite positioning technologies, you can obtain your current location and time in real time; usually, the acquisition frequency can reach 1 time per second or faster;

The vehicle can estimate the average vehicle speed during this period by obtaining the position and time multiple times; the specific number of times can be set according to the situation. For example, under normal circumstances, the instantaneous vehicle speed can be estimated with the latest two acquired positions and times as As for the own vehicle speed, the average vehicle speed of the instantaneous vehicle speeds calculated for the last 5 times may also be used as the current vehicle speed.

102. The vehicle obtains the vehicle information of other vehicles around;

Using existing short-range wireless communication technologies, such as WIFI, Bluetooth, ZigBee, etc., a wireless self-organizing network can be built within a range of hundreds of meters to achieve temporary wireless communication; other vehicle networking technologies can also be used to achieve short-range temporary wireless communication;

The temporary wireless communication may be point-to-point wireless communication, or wireless network communication with network management;

When the speed of the vehicle is fast, the transmission quality of the above-mentioned wireless network channel may be affected, but the impact can be reduced by reducing the frequency of transmission;

The vehicle can obtain the comprehensive vehicle information sent by other surrounding vehicles by using the above-mentioned temporary wireless channel, including its own vehicle information and other vehicle information processed by it;

The vehicle information includes information such as vehicle identification, vehicle speed, location, time, and road condition phrases; the vehicle identification is the unique identification of the vehicle; the road condition phrase is a phrase given by the user to describe the current traffic condition, or an agreed code.

103. The vehicle periodically sends comprehensive vehicle information;

The vehicle uses the above-mentioned wireless communication link to regularly send out comprehensive vehicle information.

The comprehensive vehicle information is the optimized vehicle information of the vehicle, and the selected vehicles include:

Vehicles within 10-50 kilometers ahead and 500 meters behind; the threshold can be set by yourself;

Other vehicles in the same direction as yourself, because the opposite direction usually has no reference meaning; but it can also be set;

For other vehicles in the last 30 seconds, the overtime vehicle information may be meaningless; the threshold can be set by yourself.

The frequency of regular sending can be set according to the situation, such as under normal circumstances, it can be set to 1 time per second;

According to the vehicle speed, the transmission frequency will be adjusted. For example, when the vehicle speed reaches 30 kilometers per hour, the transmission frequency will be reduced to once every 5 seconds; if the vehicle speed reaches 50 kilometers per hour, the transmission will be stopped; these values can be set.

104. Set up interconnected wireless hotspots on the road, and the passing vehicles are connected to them;

Set up wireless hotspots at important points on the road; the so-called important points are only points considered important by humans, and there may be no fixed selection criteria;

Wireless hotspots can be WIFI standard hotspots that meet the 802.11b/g/n/ac protocol, or other types of wireless hotspots;

Wireless hotspots are connected through existing methods, such as 3G/4G wireless methods, or 100M/1000M Ethernet to form a road network; the traffic control center is connected to the road network;

Vehicles that pass by the hotspot actively connect to the hotspot and establish a vehicle-road wireless link with it;

The vehicle connected to the hotspot receives the road information released by the hotspot, and sends its own comprehensive vehicle information to the hotspot.

105. Vehicle calculation of local traffic situation;

The vehicle can judge the traffic situation at the current point and ahead in real time by obtaining its own speed and information of nearby vehicles.

106. The traffic control center calculates the overall traffic situation;

The traffic management center obtains global vehicle information through vehicle-road coordination, so that it can obtain information such as average vehicle speed, congestion location, and congestion time in the global scope. After processing, it can know the traffic situation in the global scope.

Embodiment two

FIG. 2 is a schematic diagram of a vehicle-road coordinated traffic situation awareness system according to Embodiment 2 of the present invention. As shown in Figure 2, the system includes the following subsystems.

201. Vehicle-mounted subsystems, including:

Positioning and processing unit: use GPS, Beidou and other satellite positioning devices to obtain the current position and time of the own vehicle in real time; through the position and time obtained multiple times, the average speed of the vehicle during this period can be estimated, such as the latest 5 seconds The average speed of the vehicle is taken as the current speed; all received vehicle data are processed;

Wireless network unit: use the existing WIFI, Bluetooth, ZigBee to build an ad hoc network, or use various car networking technologies to realize wireless data communication within a short distance such as a range of 100 meters; establish temporary wireless data links with surrounding vehicles; receive Data of surrounding vehicles; sending comprehensive vehicle data to surrounding vehicles;

User input and output unit: accept user input and display road condition information.

202. The road network subsystem, including:

Access point unit: install WIFI wireless hotspots that meet protocol standards such as 802.11b/g/n/ac at important points on the road;

Network unit: through existing network technologies such as 3G/4G wireless, or 100M/1000M Ethernet, the interconnection between wireless hotspots is realized to form a road network, and the traffic control center is connected to the road network;

Information exchange unit: Pass the vehicle within the range of the hotspot, and actively realize the wireless connection with the hotspot; once the vehicle establishes a connection with the hotspot, it will immediately send the comprehensive information of the vehicle to the network; and receive the road condition information issued by the road network.

203. The traffic management center subsystem, including:

Information exchange unit: access to the road network, receive information sent by vehicles at each hotspot, and send information to vehicles at each hotspot;

Information processing unit: comprehensively process the received information;

Information publishing unit: generating road condition information to be released to vehicles at wireless hotspots.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. A method for traffic situation awareness of vehicle-road coordination, characterized in that, comprising: The vehicle obtains information such as its own position and speed; The vehicle obtains the vehicle information of other vehicles around; The vehicle periodically sends comprehensive vehicle information; Wireless hotspots are set up on the road and interconnected, and vehicles passing through the hotspots connect to the hotspots; The vehicle connected to the hotspot receives the road condition information broadcast by the hotspot, and sends the vehicle information to the hotspot; The vehicle calculates the local traffic situation, and the traffic control center calculates the global traffic situation. 2. The method for traffic situation awareness of vehicle-road coordination according to claim 1, wherein the vehicle obtains information such as its own position and speed, including: The vehicle obtains the current position and time of its own vehicle in real time through the on-board positioning device; The vehicle estimates the speed of its own vehicle through the position and time acquired multiple times. 3. The method for vehicle-road coordination traffic situation awareness according to claim 1, wherein the vehicle acquires vehicle information of other vehicles around, including: The vehicle establishes a temporary wireless data link with surrounding vehicles through short-range wireless communication technology; The vehicle receives comprehensive vehicle information from all surrounding vehicles through the temporary wireless data link. The comprehensive vehicle information includes its own vehicle information and other vehicle information processed by it; vehicle information includes vehicle identification, vehicle speed, location, Information such as time and road condition phrases; the vehicle identification is the unique identification of the vehicle, and is an identification for distinguishing vehicles; the road condition phrase can be a code indicating the road condition. 4. The method for vehicle-road coordination traffic situation awareness according to claim 1, wherein the vehicle periodically sends comprehensive vehicle information, including: The vehicle merges all received vehicle information; The vehicle forms comprehensive vehicle information from the vehicle information in its forward direction; The vehicle sends out comprehensive vehicle information regularly through the temporary wireless data link; When the vehicle passes a wireless hotspot on the wireless road and establishes a connection with the hotspot, it sends comprehensive vehicle information to the hotspot; Comprehensive information only includes vehicle information within a certain distance from itself; The comprehensive information only includes the vehicle information in the same direction as itself; The comprehensive information only includes the vehicle information within a certain range with the current moment; The length of the comprehensive vehicle information will be controlled within a certain range. 5. The method for traffic situation awareness of vehicle-road coordination according to claim 1, characterized in that wireless hotspots are set on the road and interconnected, and vehicles passing through hotspots are connected to hotspots; comprising: Set up wireless hotspots at important points on the road, which are access points for wireless network connections; Wireless hotspots are connected to each other through existing methods to form a road network; The traffic control center is connected to the road network through existing methods; Vehicles passing through the hotspot will actively connect to the hotspot and establish a vehicle-road wireless link; Vehicles that have established vehicle-road wireless links with road hotspots receive road condition information broadcast by hotspots; send their own comprehensive vehicle information to hotspots; The traffic control center receives the vehicle information sent by the vehicle connected to the hotspot, and sends relevant traffic situation information near the hotspot to the vehicle at the hotspot. 6. The method for vehicle-road coordination traffic situation awareness according to claim 1, wherein the vehicle calculates the local traffic situation, and the traffic control center calculates the global traffic situation, including: The vehicle merges all received vehicle information; The vehicle forms a local traffic situation related to itself; The traffic management center merges all vehicle information received globally; The traffic control center forms a global traffic situation including the driving speed, average speed, and congested road sections of vehicles in the global range. 7. A vehicle-road coordinated traffic situation awareness system, characterized in that it comprises: Vehicle on-board systems, used to determine, process and send and receive vehicle information, user input and display, etc.; Road network system, used for the construction of road network and wireless hotspots; The traffic control center system is used for data processing of the traffic control center. 8. The vehicle-road coordination traffic situation awareness system according to claim 7, characterized in that the vehicle-mounted system is used to determine, process and send and receive vehicle information, user input and display, etc., including: The vehicle obtains the current position and time of its own vehicle in real time; The vehicle estimates the speed of its own vehicle through the position and time obtained multiple times; The vehicle establishes a temporary wireless data link with surrounding vehicles through short-range wireless communication technology; The vehicle receives the vehicle information of the surrounding vehicles through the temporary wireless data link; The vehicle accepts user input, forms comprehensive vehicle data, and sends it to surrounding vehicles through a temporary wireless data link; The vehicle displays traffic information. 9. The vehicle-road coordinated traffic situation awareness system according to claim 7, characterized in that the road network system is used for the construction of road networks and wireless hotspots, including:  Install wireless hotspots at important points on the road; Wireless hotspots are interconnected through existing network technology to form a road network; The traffic control center system is connected to the road network; Pass the vehicle within the range of the hotspot to establish a connection with the hotspot; Vehicles that establish a connection with the hotspot send vehicle comprehensive information to the network and receive road condition information released by the network. 10. The vehicle-road coordinated traffic situation awareness system according to claim 7, wherein the traffic control center system is used for data processing of the traffic control center, including: Receive comprehensive vehicle information issued by vehicles passing through wireless hotspots; Synthesize all vehicle information and road condition information to form global traffic and road condition information; Generate and distribute road condition information related to the area to vehicles at wireless hotspots.