CN104949684A - Vehicle-mounted navigation system based on vehicle access collaboration - Google Patents

Abstract

A car navigation system based on vehicle-road coordination is composed of a car unit, a roadside unit and a wireless communication network connecting them. The on-board unit and the roadside unit are composed of a power supply, a positioning device, a wireless short-range communication device, an embedded system, a touch display screen, and a storage unit. The power supply supplies power to the entire system; the touch screen displays the vehicle position and map information; the positioning device performs positioning; the wireless short-range communication device and the vehicle-mounted unit and roadside unit around the system perform network interconnection; the embedded system analyzes the vehicle information and road conditions; The storage unit stores maps and other information; the vehicle-mounted unit realizes vehicle navigation and collects information related to the vehicle; the roadside unit provides current traffic information and road information updates; the vehicle-mounted unit and the roadside unit are communicated through wireless short-range communication equipment communication.

Description

Car Navigation System Based on Vehicle-Road Coordination

technical field

The invention relates to the fields of traffic management and vehicle navigation communication, in particular to a vehicle navigation system based on vehicle-road coordination.

Background technique

In recent years, with the popularization of automobiles and the construction of roads, the use of cars between cities will be very common. Due to the unfamiliarity of the roads, drivers have an increasing demand for navigation. The car navigation system has gradually become an important device on the car.

Current navigation systems include the following:

Car DVD navigation system: Generally, it is built in the car factory, embedded in the center console of the car, dedicated to special cars, and has a good integration with the interior decoration of the car. The disadvantages are that the price is high, the map is difficult to update, it is not portable, the navigation performance is single, and it can only display the status of the own car.

Portable navigation system: The appearance is the same as ordinary MP4, which makes up for the shortcomings of the car navigation system. The configuration is flexible. Generally, it is adsorbed on the front windshield, and the map upgrade is more convenient. The navigation function of the mobile phone has evolved from the portable navigation system. It can only display the driving status of the own vehicle.

At present, the known vehicle navigation system is composed of a positioning system, a touch display screen, and a host. The current location information of the vehicle is obtained through the positioning system, and then matched with the offline data stored in the host, where the offline data includes the latitude and longitude of the map vector data, place names and other information. Then the navigation path is planned through a certain algorithm, and finally the map information of the current location, the current vehicle location and the planned navigation path are displayed on the touch screen.

The existing navigation system can only display the driving information of the own vehicle alone, and the driving information and status of the surrounding vehicles can only be observed and judged by the driver, which virtually increases the driver's driving requirements and difficulty, and at the same time cannot effectively Avoid road traffic safety problems. At the same time, road information such as road traffic flow and road maintenance cannot be considered during the route planning process of the navigation system. If you drive according to the planned route, it is easy to enter a congested road or a road closed for construction. For the map update of the navigation system, you can only download the offline map through the computer first, and then copy it to the navigation system. The map cannot be updated in real time during the driving process of the car, and it is also limited by the frequency of the manufacturer's release of the map update package.

Contents of the invention

In order to overcome the shortcomings of the existing car navigation system that cannot display the driving information or status of vehicles around the vehicle, cannot consider traffic conditions before planning the navigation route, and inconveniently update offline maps, the purpose of the present invention is to provide a car navigation based on vehicle-road coordination system, which can complete vehicle navigation and safety warning. During the navigation process, the system can not only display the status of the own vehicle and related navigation information, but also display the information or status of the surrounding vehicles, especially a system that can display the driving status of the surrounding vehicles and the traffic conditions around the current driving road. Car navigation system. At the same time, it can also be combined with safety to improve the safety of automobile use.

To achieve the above object, the technical solution of the present invention is:

A car navigation system based on vehicle-road coordination, which is composed of an on-board unit (OBU), a roadside unit (RSU) and a wireless communication network connecting them. The on-board unit and the roadside unit are composed of a power supply, a positioning device, and a wireless short-range communication device. , an embedded system, a touch screen, and a storage unit; the power supply supplies power to the entire system, the touch screen displays vehicle and map information, the positioning device performs positioning, and the wireless short-range communication device communicates with the vehicle-mounted units and roadside units around the system. Connected, the embedded system analyzes the vehicle information and road conditions, and the storage unit stores maps and other information; the wireless communication network is composed of wireless short-range communication devices and a unified dispatch center;

The on-board unit realizes the navigation of the vehicle and collects information related to the vehicle;

The roadside unit provides current traffic information and updates of road information;

The on-board unit and the roadside unit communicate through wireless short-range communication equipment;

The wireless short-range communication devices conduct a dynamic ad-hoc network, automatically join the network when entering the network space range, and automatically exit the network when leaving the range.

1. Roadside Unit (RSU)

A roadside unit is set up within a certain range of each road. The roadside unit is responsible for establishing the wireless communication network of the current road for all vehicles driving on the current road to join in order to collect and release current traffic information and count the number of vehicles on the current road. flow and enable information sharing between on-board units. Each roadside unit is connected to the wired or wireless network, and shares its own information with other roadside units through the wired or wireless network, and also receives the control scheduling information sent by the control dispatching center. This information includes traffic conditions and up-to-date map information for roads, etc.

2. On-board unit (OBU)

When the driver needs to navigate, first set the navigation route on the vehicle unit, and then receive and process the relevant route traffic information, such as obtaining the road traffic conditions between the departure place and the destination through the roadside unit, and then give the optimal driving route and display. Whenever entering a new road, the on-board unit will use the information issued by the current road roadside unit to update the selection of the current road. In addition to the navigation function, the on-board unit can also collect information such as the location, speed and driving status of the own vehicle. The driving state includes whether it is in a braking state, whether it needs to turn or change lanes, and the driving direction when passing an intersection. At the same time, the information of other vehicles within a certain range is obtained through the short-range communication network, and the position of the own vehicle and the positions of surrounding vehicles are displayed on the map at the same time. The on-board unit calculates the distance between the surrounding vehicles and the own vehicle, and uses different colors to display the position of the other vehicles on the display interface according to the distance between the own vehicle and other vehicles, so that the driver can judge the dynamics of the surrounding vehicles in advance and avoid vehicles in an unsafe driving condition.

Furthermore, in order to ensure the accuracy of information exchange and the reliability of the vehicle-road collaborative navigation system, the frequency of information exchange between devices in the network needs to have certain requirements (such as not less than 5 Hz), and the data update rate of positioning devices There are also certain requirements (such as not lower than 5 Hz).

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

The invention can conveniently grasp the driving state of the surrounding vehicles and the traffic information of the road while realizing the vehicle navigation, and can optimize the navigation path according to the traffic information of the road. It not only ensures the realization of the basic functions of navigation, but also improves the safety of driving. Further, it can be combined with vehicle active safety control (such as braking, steering, etc.) to improve vehicle safety.

Description of drawings

Fig. 1 is a principle flow chart of the present invention;

Fig. 2 is a navigation software interface diagram;

Fig. 3 is a structural block diagram of the on-board unit;

Fig. 4 is a structural block diagram of the drive test unit;

Fig. 5 is a physical frame diagram of the navigation system of the present invention.

Detailed ways

The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:

As shown in Figure 1, after the system is turned on, it first initializes, and then reads the dynamic data and map data of the own vehicle, including the positioning data, speed, steering and braking information of the own vehicle, as well as the relationship between the vehicle and the road. Wireless communication data between. Next, if the read wireless communication data is obtained from the roadside unit, the map file in the navigation system and the positioning data of the vehicle are respectively updated according to the received data. If the wireless communication data comes from the on-board unit carried by the surrounding vehicles, it is necessary to analyze the corresponding vehicle dynamic data, such as speed, positioning data, steering data and braking data, etc., and display it on the navigation interface. Then choose whether navigation is needed, and if necessary, set the starting point and destination. After the setting is completed, the on-board unit will send the set navigation information to the roadside unit, and the roadside unit will plan the optimal route by reading the traffic conditions of the departure and destination , and then fed back to the vehicle unit for navigation. If no navigation is required, only relevant map information and vehicle dynamic data will be displayed.

The navigation software interface is shown in Figure 2. The speed and heading angle of the vehicle are displayed in the status area of the vehicle, and the speed is directly displayed through numbers, which is convenient for the driver to understand. In the current intersection information area, the traffic light status of the intersection that is about to pass is displayed, and the traffic flow information of the road is also provided at the same time, so that the driver can choose the road to drive. The information of the vehicle closest to the vehicle is displayed in the adjacent vehicle status area, including speed, steering wheel angle, yaw rate, braking status, heading angle, etc. At the same time, according to the actual situation, corresponding warnings will be given to the driver in the warning area. The satellite status, current time and ambient temperature are displayed at the bottom of the interface. The map part is first displayed on the map to display the position of the own vehicle, and also displays the position and information of the surrounding vehicles within a certain range of the own vehicle. For example, in the interface, five stars can be used to represent the vehicles around the own vehicle, and other shapes or colors can also be used instead , as long as different levels of distance from the self-vehicle are displayed.

The vehicle is equipped with a vehicle-mounted unit as shown in Figure 2. The vehicle-mounted unit can obtain dynamic data such as the speed, steering information and braking information of the vehicle through a certain method (such as CAN bus); use the GPS module to realize the positioning of the vehicle; use the wireless The communication module realizes information exchange and sharing between the on-board unit of the own vehicle and the on-board units of surrounding vehicles, and between the on-board unit of the own vehicle and the roadside unit.

The roadside unit is set up on the roadside according to traffic control, etc., and its structure is shown in Figure 4. The roadside unit is connected to the traffic control center and other roadside units through a wired or wireless network, and the traffic information data sharing between the control center and all roadside units is realized in the wired or wireless network.

The working principle and specific implementation process of the invention are shown in FIG. 5 .

Function 1: Collection and display of information around the vehicle

The vehicles in the picture are all equipped with on-board units, assuming that car A is the own car and car B is the other car. When car A and car B enter the network range of the roadside unit RA, car A and car B will dynamically join the wireless network established by the roadside unit RA. Through the data exchange between vehicles and roads, the navigation system of car A can simultaneously display the position and driving information of car A (own car) and car B (other car). Similarly, the navigation system of car B can display the relevant information of car B (own car) and car A (other car). If car B brakes suddenly, car A can get a corresponding warning from the navigation system in time, which reduces the reaction time for the driver of car A to pass the observation. vice versa.

Function 2: Traffic information collection and release

Car C and car D are both in the wireless network established by the roadside unit RB. At this time, car C and car D had a serious traffic accident, which caused the road to be severely paralyzed. The roadside unit RB can transmit this information to the roadside unit RA through the wired network to know, and then send the accident information to the roadside unit RA through the roadside unit RA. Car A and Car B. Realize the collection and release of current road traffic information.

Function 3: Dynamic Planning of Traffic Routes

Initially, the map stored in the on-board unit of car A cannot display the intersection in the navigation system, because its offline map has not been updated in time. Update the map in the navigation system.

When car A starts driving, the driver can set a destination. The on-board unit of the navigation system interacts and shares information with the roadside unit to plan two paths for car A to arrive. One is to pass through car C and car D. The road of the traffic accident arrives, and this path is the shortest. The other can be reached by going straight through the current intersection, but it's a longer journey than the first. If it is an existing navigation system, the first path will definitely be presented to the driver as the optimal path when planning the path. The navigation system of this patent invention can learn from the roadside unit that there is traffic on the road where cars C and D are located, and there is serious congestion. Therefore, the system will prompt the driver during the planned route and let the driver choose which route to use according to his actual situation. destination. Similarly, the control and dispatch center will adjust the direction of vehicles by controlling the traffic lights at the intersection to reduce the impact of traffic accidents between cars C and D.

The above is only a specific implementation of the present invention, but the scope of protection of the present invention is not limited thereto, and any changes or replacements that do not come to mind through creative work shall be covered within the scope of protection of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope defined in the claims.

Claims (8)

1. A car navigation system based on vehicle-road coordination, which is composed of a vehicle-mounted unit, a roadside unit and a wireless communication network connecting them. It is characterized in that the vehicle-mounted unit and the roadside unit are composed of a power supply, a positioning device, a wireless short-range communication device, an embedded system, a touch display screen, and a storage unit. The power supply supplies power to the entire system; the touch screen displays the vehicle position and map information; the positioning device performs positioning; the wireless short-range communication device and the vehicle-mounted unit and roadside unit around the system perform network interconnection; the embedded system analyzes the vehicle information and road conditions; The storage unit stores maps and other information. The on-board unit realizes the navigation of the vehicle and collects information related to the vehicle; The roadside unit provides current traffic information and updates of road information; The on-board unit and the roadside unit communicate through wireless short-range communication equipment; The wireless short-range communication devices conduct a dynamic ad-hoc network, automatically join the network when entering the network space range, and automatically exit the network when leaving the range. 2. The system according to claim 1, characterized in that the road side unit is set within a certain road range. The roadside unit is responsible for establishing the wireless communication network of the current road for all vehicles driving on the current road to join in order to collect and release current traffic information, count the traffic flow of the current road and realize information sharing between vehicle-mounted units; Each roadside unit is connected to a wired or wireless network, and shares its own information with other roadside units through a wired or wireless network. At the same time, it can also receive the control and dispatch information sent by the control and dispatch center, which includes the latest map information of traffic conditions and roads. 3. The system according to claim 1, wherein the specific setting of the on-board unit is as follows: when the driver needs to navigate, first set the navigation path on the on-board unit, and then receive and process the relevant path traffic information, such as passing through the road. The side unit obtains the road traffic conditions between the departure point and the destination, and then gives the optimal driving route and displays it. Whenever the on-board unit enters a new road, it will use the information issued by the current road side unit to update the selection of the current road. In addition to the navigation function, the on-board unit collects the position, speed and driving status information of the own vehicle at the same time; at the same time, it obtains the information of other vehicles within a certain range through the short-range communication network, and simultaneously displays the position of the own vehicle and the positions of surrounding vehicles on the map. In addition, by calculating the distance between the surrounding vehicles and the own vehicle, the on-board unit can also display the position of the other vehicles on the display interface according to the distance between the own vehicle and other vehicles, so that the driver can judge the dynamics of the surrounding vehicles in advance and avoid the vehicle in an unsafe driving condition. 4. The system according to claim 3, wherein the driving status information includes braking status information, steering or lane changing information, and driving direction when passing through an intersection. 5. The system according to claim 1, characterized in that the frequency of information exchange between devices in the wireless communication network of the entire system is not lower than 5 Hz, and the data update rate of positioning devices is not lower than 5 Hz. 6. The system according to claim 1, wherein the entire navigation system only displays the information of the own vehicle and the surrounding vehicles on the navigation system; the information exchange between the own vehicle and the surrounding vehicles is completed by wireless short-range equipment. 7. The system according to claim 1, characterized in that wireless communication equipment is used to complete relevant information transfer between vehicles and between vehicles and roadsides. 8. The system according to claim 1, wherein the navigation system utilizes the display system on the current vehicle to display navigation-related information, and at the same time collects vehicle information on the current vehicle for subsequent information exchange and navigation.