CN110853162A - Working method of multi-lane free-flow system of expressway - Google Patents

Abstract

The invention discloses a working method of a freeway multilane free flow system, which is applied to the technical field of intelligent traffic and has the technical scheme that: the method comprises a vehicle-mounted electronic tag, an electronic tag read-write antenna, a vehicle detection system, an image snapshot system, lane coordination equipment and a terminal, and comprises the following steps: step 1, when a vehicle passes through a portal frame, a vehicle detection system adopts laser raster scanning to obtain the overall dimension of the vehicle, and then the vehicle type is judged as the payment amount; has the technical effects that: the multiple antennas cover multiple lanes, so that mutual interference of signals between adjacent antennas is avoided, the multiple antennas are synchronized, and a control center coordinates the switch time slots of the antennas to eliminate adjacent lane interference.

Description

Working method of multi-lane free-flow system of expressway

technical field

The invention belongs to the technical field of intelligent transportation, in particular to a working method of a multi-lane free flow system of an expressway.

Background technique

The emergence of the ETC (Electronic Non-stop Toll Collection) system has changed the traditional manual toll collection method, enabling vehicles to complete the payment process without stopping when passing through toll booths on expressways, bridges or tunnels, which greatly improves the utilization rate of the road. , improve the speed of vehicles, reduce traffic congestion, and reduce carbon emissions to a certain extent. At the same time, it also reduces the labor demand of the toll station and reduces the operating cost of the toll lane. The non-stop charging method is adopted by more and more countries and cities.

With the development of economy, the problem of traffic congestion caused by the rapid growth of urban vehicles is becoming more and more serious. The traditional ETC adopts a single-lane setting, one vehicle and one pole, the vehicle speed is difficult to exceed 40km/h, and the lane equipment occupies a large road surface area, which is not suitable for tunnels, bridges or toll crossings with limited width.

The multi-lane free-flow charging method does not set lane railings, and there is no isolation between multiple lanes, which further increases the speed of vehicles, and the toll station is no longer a checkpoint for road congestion. At the same time, it also reduces the cost of lane infrastructure construction and the area occupied by the road surface, which is especially important for road and bridge tolls and tunnel tolls. In addition, some countries with serious urban congestion have also adopted multi-lane free-flow charging methods, implemented congestion charging, and implemented floating charges for vehicles entering congested road sections according to time periods, limiting the number of vehicles and alleviating congestion.

The charging method of multi-lane free flow has attracted the attention of many countries and cities, and is an important development direction in the field of intelligent transportation in the future.

SUMMARY OF THE INVENTION

Purpose of the invention: The purpose of the present invention is to aim at the deficiencies in the current technology, to provide a working method of a free-flow system of a multi-lane expressway, and its advantages are: a single RSU antenna of the present invention can conduct communication transactions with multiple OBUs at the same time, making full use of time slices, The multi-task and multi-thread processing method is adopted to reduce the waiting time of RSU and OBU.

Technical solution: In order to achieve the above purpose, the present invention provides a working method of a highway multi-lane free flow system. The highway multi-lane free flow system includes a vehicle-mounted electronic tag, an electronic tag reading and writing antenna, a vehicle detection system, an image capture system, and a lane. To coordinate equipment and terminals, the specific work steps are as follows:

Step 1. When the vehicle passes through the gantry, the vehicle detection system uses laser raster scanning to obtain the overall dimensions of the vehicle, and then determines the vehicle type as the payment amount;

Step 2, by accepting the radio frequency signal emitted by the vehicle-mounted electronic tag, locating the vehicle-mounted electronic tag, comparing it with the vehicle type recorded by the vehicle detection system, and sending the violation information to the terminal for processing if it is inconsistent;

Step 3. After the vehicle enters the coverage area of the electronic tag read-write antenna, the on-board electronic tag is activated and connected to the electronic tag read-write antenna for authentication and communication. When the electronic tag read-write antenna confirms that the on-board electronic tag is legal, the The MAC number of the vehicle-mounted electronic tag is sent to the terminal, and the terminal completes the deduction and generates a transaction serial number;

Step 4: The image capture recognition system captures the vehicle photos, performs license plate recognition on the images, and automatically generates a serial number while capturing the image, matches the transaction serial number, and automatically transfers the data to the terminal to save the data. If the number does not correspond, the terminal judges the non-violating vehicle as the basis for fee recovery.

As a further improvement of the present invention, the electronic tag reading and writing antenna includes a main control machine, a transmitting unit and several receiving units. The transmitting unit is used to modulate the transaction data into microwaves after specific encoding, and the receiving unit It is used to receive the microwave signal of the vehicle-mounted electronic tag, demodulate, decode and data analyze the microwave signal, and send the useful data information to the transmitting unit. Power supply to the antenna.

As a further improvement of the present invention, the transmitting unit is connected to all receiving units through a bus, and when the receiving unit receives the signal and parses it correctly, it sends an interrupt signal to the bus, and the transmitting unit detects that an interrupt occurs on the bus signal to query the data buffers of all the receiving units to obtain the received data.

As a further improvement of the present invention, the transmitting unit is connected through RS485, and the main control computer is connected with the lane coordination device through RS232 serial port and LAN interface.

As a further improvement of the present invention, the transmitting unit includes a microwave transmitting module, an MCU and a PASM controller. The microwave transmitting module modulates the transaction data to be sent on a carrier wave, and sends it to a vehicle-mounted electronic tag through a microwave antenna, and the MCU is used for the transaction The data organization of the physical layer, link layer and application layer of the process can obtain multiple received data information through the high-speed 485 bus, and the PASM controller can realize high-speed communication through the built-in PASM card slot.

As a further improvement of the present invention, the receiving unit includes a microwave receiving module and an MCU, and the microwave receiving module receives the microwave signal of the vehicle-mounted electronic tag after demodulation and sends the MCU for processing.

As a further improvement of the present invention, the main control machine includes an ARM processor, a PSAM card reader and an AC/DC power supply system, the ARM processor is used for the data transmission interface between the antenna terminal and the lane coordination equipment, and the PSAM card reader The reader reads and writes data through the built-in card reader module, and the AC/DC power supply converts the 220V AC power into 24V DC power and distributes it to the entire system.

The working method of the expressway multi-lane free flow system of the present invention, the beneficial effects of the present invention:

1. Simplify the transaction process, minimize the data interaction between RSU and OBU under the condition that the transaction is safe and reliable, optimize the processing speed of each module and the data transmission time between modules, so that the time for a single OBU to complete the transaction is controlled within 20ms~ 30ms, a single RSU antenna can conduct communication transactions with multiple OBUs at the same time, make full use of time slices, and adopt multi-tasking and multi-threading processing methods to reduce the waiting time of RSU and OBU;

2. Multiple antennas cover multiple lanes, avoid signal interference between adjacent antennas, synchronize multiple antennas, coordinate the switching time slots of each antenna by a control center, eliminate adjacent channel interference, and receive microwave signals transmitted by OBU , locate the OBU, determine the physical location of the OBU in the communication area, and cooperate with systems such as vehicle location tracking to complete the inspection of illegal vehicles.

Description of drawings

FIG. 1 is a schematic diagram of the overall flow structure of this embodiment.

Detailed ways

The present invention will be further clarified below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" ” refer to directions towards or away from the geometric center of a particular part, respectively.

Example: The working method of the multi-lane free-flow system of the expressway, as shown in Figure 1, includes a vehicle-mounted electronic tag, an electronic tag reading and writing antenna, a vehicle detection system, an image capture system, a lane coordination device and a terminal, including the following steps:

Step 1. When the vehicle passes through the gantry, the vehicle detection system uses laser raster scanning to obtain the overall dimensions of the vehicle, and then determines the vehicle type as the payment amount;

Step 2, by accepting the radio frequency signal emitted by the vehicle-mounted electronic tag, locating the vehicle-mounted electronic tag, comparing it with the vehicle type recorded by the vehicle detection system, and sending the violation information to the terminal for processing if it is inconsistent;

Step 3. After the vehicle enters the coverage area of the electronic tag read-write antenna, the on-board electronic tag is activated and connected to the electronic tag read-write antenna for authentication and communication. When the electronic tag read-write antenna confirms that the on-board electronic tag is legal, the The MAC number of the vehicle-mounted electronic tag is sent to the terminal, and the terminal completes the deduction and generates a transaction serial number;

Step 4: The image capture recognition system captures the vehicle photos, performs license plate recognition on the images, and automatically generates a serial number while capturing the image, matches the transaction serial number, and automatically transfers the data to the terminal to save the data. If the number does not correspond, the terminal judges the non-violating vehicle as the basis for fee recovery.

As shown in Figure 1, the electronic tag reading and writing antenna includes a main control machine, a transmitting unit and several receiving units. The transmitting unit is used to modulate the transaction data into microwaves after specific encoding, and the receiving unit is used for Accepts the microwave signal of the vehicle-mounted electronic tag, demodulates, decodes and parses the microwave signal, and sends the useful data information to the transmitting unit. powered by.

As shown in Figure 1, the transmitting unit is connected to all receiving units through a bus. When the receiving unit receives the signal and parses it correctly, it sends an interrupt signal to the bus. The transmitting unit detects that an interrupt signal occurs on the bus. Query the data buffers of all the receiving units to obtain the received data.

As shown in Fig. 1, the transmitting unit is connected through RS485, and the main control machine is connected with the lane coordination equipment through the RS232 serial port and the LAN interface.

As shown in Figure 1, the transmitting unit includes a microwave transmitting module, an MCU and a PASM controller. The microwave transmitting module modulates the transaction data to be sent on a carrier wave, and sends it to the vehicle-mounted electronic tag through a microwave antenna. The MCU is used for the transaction process. Physical layer, link layer and application layer data organization, through high-speed 485 bus to obtain multiple received data information, the PASM controller can achieve high-speed communication through the built-in PASM card slot.

As shown in FIG. 1 , the receiving unit includes a microwave receiving module and an MCU, and the microwave receiving module receives the microwave signal of the vehicle-mounted electronic tag after demodulation and sends it to the MCU for processing.

As shown in Fig. 1, the main control machine includes an ARM processor, a PSAM card reader and an AC/DC power supply system. The ARM processor is used for the data transmission interface between the antenna end and the lane coordination equipment, and the PSAM card reader passes through the The built-in card reader module reads and writes data, and the AC/DC power supply converts 220V AC power into 24V DC power and distributes it to the entire system. .

Beneficial effects: Simplify the transaction process, reduce the data interaction between RSU and OBU as much as possible, optimize the processing speed of each module and the data transmission time between modules, and control the time for a single OBU to complete the transaction within 20ms under the condition that the transaction is safe and reliable ~30ms, a single RSU antenna can conduct communication transactions with multiple OBUs at the same time, making full use of time slices, using multi-tasking and multi-threading processing methods to reduce the waiting time of RSU and OBU, multiple antennas covering multiple lanes, avoiding adjacent antennas The signals interfere with each other, synchronize multiple antennas, and coordinate the switching time slots of each antenna by a control center to eliminate adjacent channel interference. Physical location, cooperate with systems such as vehicle location tracking to complete the inspection of illegal vehicles.

The electrical components appearing in this application are all connected to an external power supply when in use.

The circuits, electrical components and modules involved are all in the prior art, which can be fully realized by those skilled in the art. It is needless to mention that the content of the protection of the present invention does not involve the improvement of software.

The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims (7)

1. The working method of multi-lane free-flow system of expressway, it is characterized in that, described expressway multi-lane free-flow system comprises vehicle-mounted electronic tag, electronic tag reading and writing antenna, vehicle detection system, image capture system, lane coordination equipment and terminal, The specific working steps are as follows: Step 1. When the vehicle passes through the gantry, the vehicle detection system uses laser raster scanning to obtain the overall dimensions of the vehicle, and then determines the vehicle type as the payment amount; Step 2, by accepting the radio frequency signal emitted by the vehicle-mounted electronic tag, locating the vehicle-mounted electronic tag, comparing it with the vehicle type recorded by the vehicle detection system, and sending the violation information to the terminal for processing if it is inconsistent; Step 3. After the vehicle enters the coverage area of the electronic tag read-write antenna, the on-board electronic tag is activated and connected to the electronic tag read-write antenna for authentication and communication. When the electronic tag read-write antenna confirms that the on-board electronic tag is legal, the The MAC number of the vehicle-mounted electronic tag is sent to the terminal, and the terminal completes the deduction and generates a transaction serial number; Step 4: The image capture recognition system captures the vehicle photos, performs license plate recognition on the images, and automatically generates a serial number while capturing the image, matches the transaction serial number, and automatically transfers the data to the terminal to save the data. If the number does not correspond, the terminal judges the non-violating vehicle as the basis for fee recovery. 2. The working method of the free-flow system of expressway multi-lane according to claim 1, characterized in that: the electronic tag reading and writing antenna comprises a main control machine, a transmitting unit and several receiving units, and the transmitting unit is used to convert the The transaction data is modulated into microwave after specific encoding, and the receiving unit is used to receive the microwave signal of the vehicle-mounted electronic tag, demodulate, decode and analyze the microwave signal, and send useful data information to the transmitting unit. The main control machine is used to connect the antenna terminal and the lane coordination equipment, and supply power to the antenna terminal. 3. The working method of multi-lane free-flow system of expressway according to claim 2, characterized in that: the transmitting unit is connected to all receiving units through a bus, and when the receiving unit receives the signal and correctly parses it, it sends the signal to the receiving unit. The bus sends an interrupt signal, and the transmitting unit detects that the interrupt signal occurs on the bus, and queries all the data buffers of the receiving units to obtain the received data. 4 . The working method of a multi-lane free-flow system of expressway according to claim 2 , wherein the transmitting unit is connected by RS485, and the main control machine is connected with the lane coordination device by means of an RS232 serial port and a LAN interface. 5 . 5. The free-flow system working method of expressway multi-lane according to claim 2, wherein the transmitting unit comprises a microwave transmitting module, an MCU and a PASM controller, and the microwave transmitting module modulates the transaction data that needs to be sent On the carrier, it is sent to the vehicle electronic tag through the microwave antenna. The MCU is used for the data organization of the physical layer, link layer and application layer of the transaction process, and obtains multiple received data information through the high-speed 485 bus. The PASM card slot can realize high-speed communication. 6. The working method of a multi-lane free-flow system of expressway according to claim 2, wherein the receiving unit comprises a microwave receiving module and an MCU, and the microwave receiving module receives the microwave signal of the vehicle-mounted electronic tag and sends after demodulation MCU processing. 7. The working method of multi-lane free-flow system of expressway according to claim 2, wherein the main control machine comprises an ARM processor, a PSAM card reader and an AC/DC power supply system, and the ARM processor is used for The data transmission interface between the antenna end and the lane coordination equipment, the PSAM card reader reads and writes data through the built-in card reader module, and the AC/DC power supply converts 220V AC power into 24V DC power and distributes it to the entire system.