Traffic light control method, device and system

[0074] Example one

[0075] Assuming that each information collection node at an intersection uses an omnidirectional antenna, the stable communication distance with the vehicle communication terminal (defined as the communication radius) is R, and the information collection node can be installed in the motorized right-hand lane of the intersection at a distance R from the intersection, such as image 3 As shown, in this way, the vehicle information within 2R of the motor lane from the intersection in this direction can be collected, and the information collection node transmits the vehicle passing information to the traffic light control device.

[0076] Take an intersection containing straight and left control information as an example, such as Figure 4 As shown, the specific implementation steps are as follows:

[0077] Step S401: On a road heading to an intersection, in a prohibited state, the intersection information collection node on the right side of the right lane of the road heading to the intersection establishes a Zigbee communication connection with the communication terminal carried by the vehicle within the communication radius .

[0078] In an optional case, the intersection information collection node collects the traffic direction information of the corresponding vehicle and sends it to the traffic light control device. The traffic direction information is specifically information obtained by the communication terminal from the in-vehicle control system (such as turn signals).

[0079] Step S402: The traffic light control device collects the information of all the information collection nodes deployed at the intersection, and identifies the vehicles leaving the intersection, the vehicles approaching the intersection, and the vehicles turning left on the road.

[0080] For the specific identification basis, refer to the description in step S102 described above, and the description will not be repeated here.

[0081] In this step, if the information collection node also reports the traffic direction information in the above step S401, the traffic light control device can also obtain the traffic lights heading to the intersection and located within the communication radius of the intersection information collection node of the road. One-step driving direction information, including straight, left and right, etc.

[0082] Step S403: When the traffic light in the direction of the intersection changes from prohibited to traffic, the intersection information collection node on the road after a time threshold has passed, if no vehicle is identified as driving towards the intersection , Or in the optional case, after it is recognized that all the vehicles that are going to go straight when the traffic is prohibited have all left, it is determined that all the straight vehicles in this direction have passed.

[0083] Step S404: The traffic light control device changes the straight traffic light on the road heading toward the intersection to red light (no traffic), the left traffic light to green light (passing), and the straight and left traffic lights in the crossing direction are all red. Lights (no traffic).

[0084] Step S405: After a time threshold is passed by the intersection information collection node located on the road, if no vehicle is identified toward the intersection, or, in the optional case, a left-traveling vehicle that is counted when it is prohibited is identified After all left, it is determined that all left-turning vehicles have passed.

[0085] Step S406: The traffic light control device changes the straight traffic light and the left traffic light on the direction of the road to the intersection to be red (no traffic), and the straight traffic light in the cross direction is green (passing) and the left traffic light. Red light (prohibited), the follow-up control process is similar.

[0086] Many intersections are more complex, with more lanes, and vehicles in each direction are controlled by their own signal lights. The communication terminal carried by the vehicle can transmit its own driving direction information to the information collection node, and the traffic light control device can judge based on this information Whether the vehicles in each direction have passed through, there will be no interference between each direction.

[0087] When there are some parking or malfunctioning vehicles on the roadside or driving lane, the traffic light control device will determine them. Here, the time threshold is set to t minutes. If within t minutes, the position of a certain vehicle remains unchanged , The traffic light control device judges it as a parked or malfunctioning vehicle, and will no longer be included in the consideration range when counting the passing vehicles in the future, until it drives away from the communication radius of the current intersection information collection node. The parking vehicle itself can also actively send parking and failure information to the intersection information collection node through the communication terminal, and the related failure information can also be reported to the control management center through the traffic light control device for timely troubleshooting.

[0088] When the actual driving direction of the vehicle does not match the information transmitted to the traffic light control device, it can be found through the control and management center. Because this behavior affects the system’s judgment and violates the traffic regulations, it can be notified to the vehicle management office and take corresponding measures. punishment.

[0089] Technically, first, ZigBee has the characteristics of low power consumption, which is very suitable for installation on the vehicle, such as embedded in the license plate; second, it only takes 15ms for ZigBee node equipment to connect to the network, and the maximum recognition speed can be Up to 200 km/h, it is fully suitable for the high-speed mobility of vehicles; third, because the amount of information that needs to be transmitted is small, and the communication rate of ZigBee can reach 250Kbps, it can fully meet the requirements of information transmission; fourth, ZigBee technology It has very high reliability. If the main road node is damaged, it can continue to communicate through other paths. Fifth, ZigBee readers are waterproof, lightning-proof and shock-proof, and have high safety performance in the open air environment.

[0090] Based on the above advantages, ZigBee technology is preferably used for implementation in the foregoing embodiments of the present invention.

[0091] Example two

[0092] In this embodiment, an application scenario of a system including a control management center is given. In this application scenario, set the priority for each vehicle. The priority of ordinary vehicles is set to 1, and the priority of ambulances, firetruck, police cars or some vehicles approved for temporary emergency applications is set to 2. When a high-level vehicle passes, if the information collection node at the current intersection recognizes the vehicle identification information of the vehicle, it will communicate with the traffic light control device, immediately switch the indicator light of the current direction to green, and the control and management center will collect the information according to the node The transmitted direction information of the vehicle determines the next intersection it will pass through, and sets the next intersection as a green light in advance to ease the passage of vehicles in front of it to improve the efficiency of vehicles with high priority; when the vehicle with high priority drives out After the intersection, the traffic light control device restores the traffic light switching mode of the current intersection.

[0093] The system structure diagram of the control management center, the traffic light control device and the information collection node is as follows Figure 5 Shown.

[0094] Assuming that a vehicle with a priority of 2 drives along the dotted line, the specific implementation steps of the system are as follows:

[0095] After the No. 1 information collection node finds the priority 2 vehicle, it communicates with the No. 1 traffic light control device and switches the indicator light to green.

[0096] When the No. 1 information collection node recognizes that the vehicle has driven out of the No. 1 intersection, the No. 1 intersection is restored to the normal control mode.

[0097] The control management center determines that the next intersection the vehicle will pass is No. 2, and then communicates with the No. 2 traffic light control device to switch this signal light to green in advance. The judgment is based on: when the vehicle passes the current intersection, the road where the information collection node first communicates with is the next road it will enter, and the intersection driving along this road is the next intersection; or Optionally, the direction information of the vehicle can be obtained, so that the next intersection it passes through can be obtained.

[0098] When the vehicle passes the No. 2 intersection, the control and management center judges that the next intersection it passes is No. 3, so it communicates with the No. 3 traffic light control device and switches it to the green light in advance.

[0099] In this way, it is possible to ensure that the route of the vehicle with high priority is unobstructed and improve its traffic efficiency.

[0100] In order to prevent information from being stolen or criminals forging high-priority vehicles, encryption measures should be added to ensure the normal operation of the system when transmitting information or identifying vehicle identity.

[0101] Compared with the prior art, the technical solution proposed by the embodiment of the present invention has the following advantages:

[0102] By applying the technical solution of the embodiment of the present invention, the communication terminal installed on the vehicle broadcasts the vehicle identification mark of the vehicle, and the information collection node reports the vehicle identification to the traffic light control device after receiving the vehicle identification. The corresponding information collects the change information of the node, determines the state information of the vehicle, and adjusts the state of the traffic light after the current state of the vehicle on the road reaches the traffic light state switching condition, so that the traffic light state can be carried out according to the actual situation of the road surface The adjustment of traffic control effectively improves the efficiency and effectiveness of traffic control.

[0103] In order to implement the technical solutions of the embodiments of the present invention, the embodiments of the present invention also provide a traffic light control system, the structure diagram of which is as follows: Image 6 As shown, a traffic light control device 61, a communication terminal 62, and an information collection node 63 are included.

[0104] Among them, the information collection node 63 is installed on the side of the road in each direction of the intersection, and is used to receive the vehicle identification information sent by the communication terminal 62 installed on the vehicle entering its signal coverage area, and forward it to the traffic light control device 61.

[0105] Further, the traffic light control system further includes a control server 64 for controlling multiple traffic light control systems and instructing each traffic light control device 61 to adjust the state of the corresponding traffic light when the preset rule is met.

[0106] Such as Figure 7 Shown is a schematic structural diagram of a traffic light control device 61 proposed in an embodiment of the present invention, which specifically includes:

[0107] The communication module 611 is configured to receive the vehicle identification information sent by the information collection node 63 corresponding to each direction of the intersection, where the vehicle identification information is specifically the communication terminal 62 installed on the vehicle within the signal coverage area of ​​the information collection node 63 Sent

[0108] The determining module 612 is configured to determine the status information of the vehicle corresponding to the vehicle identification information according to the change information of the information collection node 63 corresponding to each vehicle identification information received by the communication module 611;

[0109] The control module 613 is configured to adjust the traffic light state of the direction when the determining module 612 determines that the state information of the vehicle corresponding to one direction of the intersection reaches the switching condition corresponding to the current traffic light state of the direction.

[0110] Among them, the determining module 612 is specifically used for:

[0111] When the number of information collection nodes 63 that report one vehicle identification information is increased from one to multiple, or the vehicle identification information is newly reported information, it is determined that the state information of the vehicle corresponding to the vehicle identification information is the heading intersection;

[0112] When the number of information collection nodes 63 that report one vehicle identification information is reduced from multiple to one, or the vehicle identification information is no longer reported, it is determined that the state information of the vehicle corresponding to the vehicle identification information is leaving the intersection;

[0113] When the information collection node 63 that reports a piece of vehicle identification information does not change within a preset time threshold, it is determined that the state information of the vehicle corresponding to the vehicle identification information is stopped.

[0114] Further, the control module 613 is specifically used for:

[0115] When the number of vehicles driving towards the intersection exceeds the preset maximum number threshold in the direction corresponding to the traffic light in the forbidden state, the state of the traffic light in the direction is adjusted to the allowed driving state, and the direction will exist. The state of the traffic lights in the conflicting direction is adjusted to the prohibited state;

[0116] When in the direction corresponding to the traffic light in the allowed driving state, the number of vehicles in the state of driving toward the intersection is lower than the preset minimum number threshold, or the state of the traffic light in the direction is in the state of driving toward the intersection when the state of driving is prohibited When all vehicles have left the intersection, the state of the traffic light corresponding to the direction is adjusted to the prohibited state, and the state of the traffic light corresponding to the direction conflicting with the direction is adjusted to the allowed state.

[0117] In actual application scenarios, the determining module 612 is also used for when the traffic lights controlled by the traffic light control device 61 include traffic lights that control multiple turning directions in each direction of the intersection, if the communication module 611 receives The vehicle identification information sent by the information collection node 63 corresponding to each direction of the intersection also carries vehicle travel control information, and directly predicts the turning direction of the vehicle corresponding to the vehicle identification information based on the vehicle travel control information;

[0118] The control module 613 is also used to perform the status of the traffic light in the turning direction when the determining module 612 predicts that the number of vehicles driving in a turning direction reaches the switching condition corresponding to the current state of the traffic light corresponding to the turning direction. Adjustment.

[0119] It should be pointed out that the control module 613 is also used for:

[0120] Set the minimum duration of the allowed driving state and the prohibited driving state respectively to ensure that the traffic light is in the allowed driving state or the forbidden driving state after each state switch.

[0121] On the other hand, the control module 613 is also used to:

[0122] When the communication module 611 receives the control instruction sent by the control server 64 to give priority to the high-priority vehicle, it adjusts the state of the traffic light corresponding to the direction of travel of the high-priority vehicle to the allowed driving state, and there will be a driving conflict with the direction. The state of the traffic light corresponding to the direction of is adjusted to the prohibition state, and when the high-priority vehicle leaves the intersection, the normal control of each traffic light is restored.

[0123] Such as Figure 8 Shown is a schematic structural diagram of a communication terminal 62 according to an embodiment of the present invention, which is installed on a vehicle and includes at least:

[0124] The broadcast module 621 is used to broadcast the vehicle identification information of the vehicle. After the vehicle enters the signal coverage area of ​​the information collection node 63, the vehicle identification information is received by the information collection node 63 and reported to the traffic light control device 61 as a traffic light control The basis for the device 61 to control the state of the traffic light.

[0125] Further, the communication terminal 62 also includes an information collection module 622, which is connected to an information system in the vehicle, and is specifically used to obtain vehicle driving control information of the vehicle;

[0126] The broadcasting module 621 is also used to carry vehicle driving control information in the broadcast vehicle identification information, so that the vehicle driving control information serves as a basis for the traffic light control device 61 to predict the turning direction of the vehicle.

[0127] Compared with the prior art, the technical solution proposed by the embodiment of the present invention has the following advantages:

[0128] By applying the technical solution of the embodiment of the present invention, the communication terminal installed on the vehicle broadcasts the vehicle identification mark of the vehicle, and the information collection node reports the vehicle identification to the traffic light control device after receiving the vehicle identification. The corresponding information collects the change information of the node, determines the state information of the vehicle, and adjusts the state of the traffic light after the current state of the vehicle on the road reaches the traffic light state switching condition, so that the traffic light state can be carried out according to the actual situation of the road surface The adjustment of traffic control effectively improves the efficiency and effectiveness of traffic control.

[0129] Through the description of the above implementation manners, those skilled in the art can clearly understand that the embodiments of the present invention can be implemented by hardware, or can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solutions of the embodiments of the present invention can be embodied in the form of a software product, and the software product can be stored in a non-volatile storage medium (which can be a CD-ROM, U disk, mobile hard disk, etc.), It includes several instructions to enable a computer device (which may be a personal computer, a server, or a network-side device, etc.) to execute the method described in each implementation scenario of the embodiment of the present invention.