A traffic warning and guiding terminal device and a traffic warning and guiding system based on LoRa

Abstract

The application discloses a traffic warning guide terminal device and a traffic warning guide system based on LoRa, and particularly relates to the field of road traffic safety devices. The device comprises a server, the server is connected with a plurality of terminal devices through a gateway device; a LoRa communication module is further arranged on the shell, and the controller is connected with the gateway device through the LoRa communication module. The terminal device comprises a shell, a controller is arranged on the shell, and the controller is connected with a radar sensor, a power management module and a warning guide module; wherein the power management module comprises a power switch, a first DC voltage reduction converter and a second DC voltage reduction converter. The voltage provided by a solar panel and a storage battery is selected for input, and the input voltage is output to the controller, the warning guide module and the radar sensor through the first DC voltage reduction converter and the second DC voltage reduction converter, so that the stability of the controller is improved.

Description

Technical Field

[0001] This application relates to the field of road traffic safety equipment, and in particular to a traffic warning and guidance terminal device and a LoRa-based traffic warning and guidance system. Background Technology

[0002] With the continuous increase in road network density, the impact of severe weather, especially smog, on traffic safety is becoming increasingly prominent. The warning and guidance functions of a system can help reduce traffic accidents and improve the safety and reliability of the traffic system. Traditional traffic safety early warning systems have exposed many technical shortcomings when dealing with severe weather scenarios. Furthermore, under a single power supply, the core control unit (various chips) shares the same power supply with high-power loads (such as warning lights). In this design, the instantaneous start-up or high-frequency switching of high-power loads can easily generate instantaneous voltage drops and high-frequency noise pollution on the power rail. This directly interferes with the stable operation of the control unit, leading to inaccurate data acquisition, communication data loss, or even abnormal system reset, reducing system reliability. Utility Model Content

[0003] The main purpose of this application is to provide a traffic warning and guidance terminal device and a LoRa-based traffic warning and guidance system, which aims to solve the problem that existing traffic safety early warning systems are prone to unstable operation of control units.

[0004] To achieve the above objectives, this application provides a traffic warning and guidance terminal device, comprising: a housing, on which a controller is disposed, the controller being connected to a radar sensor, a power management module, and a warning and guidance module; wherein, the power management module includes a power switch, a first DC-DC step-down converter, and a second DC-DC step-down converter; the input terminals of the power switch are respectively connected to a solar panel and a battery, and the output terminals are respectively connected to the warning and guidance module and the first DC-DC step-down converter; the first DC-DC step-down converter is connected to the controller and the radar sensor respectively through a low-dropout linear regulator, and the first DC-DC step-down converter is also connected to the second DC-DC step-down converter; the second DC-DC step-down converter is connected to the warning and guidance module.

[0005] Optionally, the solar panel is connected to the power output terminal of the power switch via a diode array, and the output terminal of the battery is connected to the input terminal of the power switch.

[0006] Optionally, the output of the power switch is connected to the first pin of the first DC-DC buck converter via a first filter circuit. The second pin of the first DC-DC buck converter is connected to a voltage divider circuit. The third pin is connected in sequence to a second filter circuit and a low-dropout linear regulator. The output of the low-dropout linear regulator is connected to the controller via a third filter circuit. The fourth pin of the first DC-DC buck converter is connected to the collector. The base of the collector is connected to the first filter circuit and the controller. The emitter is connected to the first pin of the second DC-DC buck converter. The output of the power switch is connected to the second pin of the second DC-DC buck converter via the switch interface of the warning and guidance module. The third and fourth pins of the second DC-DC buck converter are connected to the control interface of the warning and guidance module via an energy storage inductor. A buck circuit and a compensation circuit connected in parallel are connected between the output of the energy storage inductor and the fifth pin of the second DC-DC buck converter.

[0007] Optionally, the warning guidance module includes a first warning light, which is used to change its state according to control commands to achieve a trail warning.

[0008] Optionally, the housing includes a base, on which a crash barrier is fixed. A battery is fixed to the base and located inside the crash barrier. A radar sensor is mounted on the outer wall of the crash barrier. Four support columns are provided inside the crash barrier. A warning and guidance module is fixed between two adjacent support columns. A backplate is fixed between two adjacent support columns. A controller and a power management module are fixed on the inner wall of the backplate. The backplate is located on the opposite side of the warning and guidance module. Three solar panels are included, with two solar panels arranged opposite each other and fixed between two adjacent support columns. The third solar panel is fixed to the free end of a support column.

[0009] To achieve the above objectives, this application also provides a LoRa-based traffic warning and guidance system, including a server, which is connected to multiple terminal devices via a gateway device; a LoRa communication module is also provided on the housing, and the controller is connected to the gateway device via the LoRa communication module.

[0010] Optionally, the warning guidance module also includes a second warning light, which is connected to the controller; the second warning light is used to change its status according to the control commands issued by the server.

[0011] Optionally, there may be multiple gateway devices, and these multiple gateway devices may dynamically form a network with each terminal device.

[0012] Compared with the prior art, the beneficial effects of this application are as follows: This utility model discloses a traffic warning and guidance terminal device. It selects the voltage input from a solar panel and a battery, and then uses a first and a second DC-DC step-down converter to output the input voltage in multiple paths to the controller, warning and guidance module, and radar sensor. The first DC-DC step-down converter is responsible for powering the system control; it has a low maximum output current and exhibits very high conversion efficiency and stability during low-power operation. The second DC-DC step-down converter is responsible for powering high-power loads and can be independently activated when high-power modules are needed. This separate structure avoids current noise pollution, achieves fault isolation, reduces power consumption, and improves the stability of the controller. The terminal device is powered by a solar panel and a battery through a power management module, eliminating the need for external power and communication cables. The radar sensor can operate stably in adverse weather conditions such as fog, nighttime, rain, and snow, monitoring vehicles moving within 40 meters at speeds not exceeding 220 km / h.

[0013] This utility model discloses a LoRa-based traffic warning and guidance system. Multiple terminal devices and multiple gateway devices are intelligently matched based on wireless signal strength. When any gateway device fails and loses connection, the terminal devices within its range automatically switch to the surrounding gateway device based on the signal strength, ensuring the line redundancy of the LoRaWAN network and realizing dynamic networking. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the functional modules of a traffic warning and guidance terminal device according to this application; Figure 2 for Figure 1 A schematic diagram of the power management module; Figure 3 for Figure 1 Circuit schematic of the power management module; Figure 4 This is a schematic diagram of the structure of a traffic warning and guidance terminal device according to this application; Figure 5 This is a schematic diagram of the functional modules of a LoRa-based traffic warning and guidance system; Figure 6 This is a distribution map of a LoRa-based traffic warning and guidance system.

[0015] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] The first embodiment of this utility model provides a traffic warning and guidance terminal device, such as... Figure 1-2 As shown, the device includes a housing, on which a controller 1 is mounted. The controller 1 is connected to a radar sensor 2, a power management module 3, and a warning guidance module 4. The power management module 3 includes a power switch, a first DC-DC step-down converter, and a second DC-DC step-down converter. The input terminals of the power switch are connected to a solar panel 5 and a battery 6, and the output terminals are connected to the warning guidance module 4 and the first DC-DC step-down converter. The first DC-DC step-down converter is connected to the controller 1 and the radar sensor 2 via a low-dropout linear regulator, and is also connected to the second DC-DC step-down converter. The second DC-DC step-down converter is connected to the warning guidance module 4.

[0018] In this embodiment, controller 1 is connected to radar sensor 2 and warning guidance module 4 respectively. Radar sensor 2 is used to monitor vehicle speed and send the monitoring results to controller 1. Controller 1 is used to receive the monitoring results and send control commands to warning guidance module 4 when the monitoring results meet preset conditions. Warning guidance module 4 is used to provide warning guidance to the vehicle according to the control commands. All terminal devices are powered by solar panels 5 and batteries 6 through power management module 3, without the need for external power supply and communication cables. The voltage provided by solar panels 5 and batteries 6 is selected as input and then output to controller 1, warning guidance module 4 and radar sensor 2 through a first DC-DC step-down converter and a second DC-DC step-down converter. The first DC-DC step-down converter is responsible for powering the system control and has a low maximum output current. It has very high conversion efficiency and stability when used in low-power mode and powers all controllers 1. The second DC-DC step-down converter is responsible for powering high-power loads and has a much higher output current than the first DC-DC step-down converter. It is used to independently activate when high-power modules are needed. This separation structure avoids current noise pollution, achieves fault isolation, reduces power consumption and improves stability.

[0019] The warning and guidance device on the terminal equipment can be remotely controlled by the cloud server to adjust the color, brightness, flashing frequency and duty cycle of the LED light array. It can realize multiple modes such as contour enhancement, rear-end collision prevention and accident warning. When necessary, it can display text information, with rich and flexible warning functions.

[0020] Specifically, the first DC-DC buck converter U11 is model TPS82130SILT, and the second DC-DC buck converter U11 is model SY8205FCC, such as... Figure 3 As shown, the output terminal J0 of the solar panel 5 is connected to the input terminal of the power switch J4 through a diode group (D9-12), and the output terminal J3 of the battery 6 is connected to the input terminal of the power switch J4. When the voltage at the output terminal J0 of the solar panel 5 is higher than the voltage at the output terminal J3 of the battery 6, the current from J0 will supply power through the forward-conducting diode group (D9-12). When J0 is disconnected or its voltage is lower than the voltage of J3, the output terminal J3 of the battery 6 automatically becomes the power supplier, providing uninterrupted power supply.

[0021] The output terminal of power switch J4 is connected to the (first) VIN pin of the first DC-DC buck converter U11 through the first filter circuit (including capacitors C6 and C7). The FB (second) pin of the first DC-DC buck converter U11 is connected to a voltage divider circuit (including resistors R32 and R33). When the output voltage of the first DC-DC buck converter U11 is normal and enters stable operation, it outputs a high-level signal and sets the output voltage through the voltage divider circuit. The third VOUT pin of the first DC-DC buck converter U11 is sequentially connected to the second filter circuit (including C8, C9, and C10) and the low-dropout linear regulator U13. The output of the low-dropout linear regulator U13 is connected to the controller 1 and the radar sensor 2 through the third filter circuit (including C43 and C44). The EN pin of the 3.3V first DC-DC buck converter U11 is connected to VIN for enable, and the SS / TR pin is grounded through capacitor C11 to set soft start and avoid power-on surge. The current output from the VOUT pin of the first DC-DC buck converter U11 is output as a stable, low-ripple 5V DC after passing through the second filter circuit. The 5V DC output from the first DC-DC buck converter U11 is divided into two parts. One part passes through the low-dropout linear regulator U13 and is filtered by the third filter circuit to output a clean 3.3V DC to the controller 1 and the radar sensor 2.

[0022] The PG (fourth) pin of the first DC-DC buck converter U11 (used to indicate normal operating status, outputting a high level when operating status is normal) is connected to a transistor Q8. The base of transistor Q8 is connected to the first filter circuit and controller 1, and the emitter is connected to the EN pin of the second DC-DC buck converter. After the first DC-DC buck converter U11 is operating stably, the other part of the 5V DC power supply is connected to the emitter follower circuit implemented by transistor Q8. The PG pin outputs a high-level signal to the collector of Q8, and when controller 1 (GPIO40) sends a high-level signal to the base of Q8, Q8 conducts, and the emitter outputs a high-level signal to the EN (first) pin of the second DC-DC buck converter U12 to enable U12. Here, transistor Q8 is equivalent to a switch, and GPIO40 controls whether the switch is on or off. When on, the PG pin of U11 is connected to the EN pin of U12. When PG outputs a high level, U12 receives a high level and operates normally; when PG outputs a low level, U12 is off. The 5V output of the first DC-DC buck converter U11 is pulled up to GPIO40 via resistor R37.

[0023] The output of power switch J4 is connected to the VIN (second) pin of the second DC-DC step-down converter U12 through the switch interface J2 of the warning and guidance module 4; the (third) LX pin and (fourth) BS pin of the second DC-DC step-down converter U12 are connected to the control interface J1 of the warning and guidance module 4 through the energy storage inductor; a step-down circuit (including R35, R36) and a compensation circuit (C38) are connected in parallel between the output of the energy storage inductor and the (fifth) FB pin of the second DC-DC step-down converter U12.

[0024] The SS pin of the second DC-DC buck converter U12 is protected from surge current impact during the chip's soft-start process by capacitor C13. The BS pin and capacitor C12 form a boost drive circuit to help the LX pin efficiently boost the voltage. The LX pin switches between 12V and 0V ground at a high frequency, outputting a square wave pulse that is fed into the energy storage inductor L1. L1 smooths the pulse current into a stable and continuous 5V DC current. In addition to supplying the warning and guidance module 4, the output current is also stepped down by R35 and R36 and compensated by the C38 loop before being fed to pin 5 (FB) of U12 for sampling, achieving a negative feedback system to adjust the output voltage. The second DC-DC buck converter U12 serves as a step-down output power supply for higher power loads, providing an independent and controllable power supply to the warning and guidance module 4.

[0025] The warning and guidance module 4 includes a first warning light 41, which is connected to the controller 1. The first warning light 41 changes its state according to control commands to provide a trail warning. The first warning light 41 is an adjustable mixed-color LED light source, or an array of single-color LED light sources of the desired color. The color, brightness, and flashing frequency are all controlled by the microcontroller 1. When the radar sensor 2 detects a moving vehicle passing by, the controller 1 controls the first warning light 41 to flash, and this flashing continues for a period of time after the vehicle leaves the detection range.

[0026] In one exemplary embodiment, such as Figure 4 As shown, the housing includes a base 7, on which a crash barrier 8 is fixed. A battery 6 is fixed on the base 7 and located inside the crash barrier 8. A radar sensor 2 is installed on the outer wall of the crash barrier 8. Four support columns 9 are installed inside the crash barrier 8. A warning guidance module 4 is fixed between two adjacent support columns 9. A backplate 10 is fixed between two adjacent support columns 9. A controller 1, a power management module 3, and a LoRa communication module are fixed on the inner wall of the backplate 10. The backplate 10 is located on the opposite side of the warning guidance module 4. There are three solar panels 5, two of which are arranged opposite each other and fixed between two adjacent support columns 9. The third solar panel 5 is fixed to the free end of a support column 9.

[0027] In this embodiment, the battery 6, radar sensor 2, controller 1, power management module 3 and solar panel 5 are integrated into the housing composed of base 7, anti-collision frame 8, back plate 10 and support column 9, so as to achieve stable operation of guidance and warning in severe weather conditions such as fog, haze, night, rain and snow.

[0028] The second embodiment of this utility model provides a LoRa-based traffic warning and guidance system, such as... Figure 5 As shown, the system includes a server connected to multiple terminal devices via a gateway device. The server is configured to receive data from the terminal devices, perform business logic processing, send downlink command data, and is connected to the gateway device via a standard Ethernet connection. A LoRa communication module is also mounted on the housing and connected to the gateway device. Based on LoRa communication technology, long-distance wireless communication is achieved through spread spectrum modulation technology, avoiding the need for laying fiber optic cables and other communication cables. It also overcomes the shortcomings of traditional wireless communication solutions, such as short distance, high power consumption, and poor anti-interference capabilities, achieving flexible deployment. For example, the LoRa communication module in this embodiment operates in the 410MHz to 525MHz frequency band, supports ADR (Adaptive Rate Adjustment) function, and can be networked via the LoRaWAN protocol. The warning and guidance module 4 also includes a second warning light 42 connected to the controller 1; the second warning light 42 is used to change its status according to control commands issued by the server.

[0029] Furthermore, the gateway device comprises multiple devices, which dynamically network with each terminal device. Specifically, as shown below... Figure 6 As shown, traffic warning and guidance terminal devices are evenly deployed on both sides of the road as terminal nodes in a star topology network. Gateway devices act as routing nodes, receiving and forwarding uplink data from the terminal nodes to the server, which is the central node. Multiple terminal devices are intelligently matched with multiple gateway devices based on wireless signal strength. When any gateway device fails and loses connection, terminal devices within its range automatically switch to nearby gateway devices based on signal strength, ensuring line redundancy in the LoRaWAN network and achieving dynamic networking.

[0030] The server configuration is used to process uplink and downlink data from terminal devices separately. Specifically, the uplink data processing steps are configured to: parse the uplink data payload from the terminal device; extract event class identifiers from the uplink data payload; and invoke the corresponding business logic processing unit based on the event class identifiers. The downlink data processing steps are configured to: receive JSON-formatted control request parameters from the user via an API interface; convert the JSON-formatted control request parameters into a specific binary data payload executable by the terminal device; and encrypt the specific binary data payload executable by the terminal device and send it as downlink data to one or more specified terminal devices.

[0031] In this embodiment, the continuous triggering of the first warning light 41 by multiple terminal devices can achieve a trail warning effect. Based on control commands issued by the server, the brightness and flashing state of the corresponding second warning light 42 are modified to achieve multiple functions such as road outline enhancement mode and accident construction protection mode.

[0032] In use, controller 1 is configured to perform communication tasks, warning and guidance tasks, and time synchronization tasks in parallel using a multi-core processor architecture; it also uses hardware interrupts to perform radar data processing in parallel; it can execute judgment algorithms based on feedback data from radar sensor 2 to provide real-time local early warning, with higher insight, faster response time, and better bandwidth availability; the server only receives results and issues instructions, which greatly reduces the communication load and ensures the stability and real-time performance of the system.

[0033] It is worth noting that the server's processing of uplink and downlink data, as well as the data processing of controller 1, are not improvements of this application; existing methods can be used, and will not be elaborated here.

[0034] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A traffic warning and guidance terminal device, characterized in that, include: The housing has a controller connected to a radar sensor, a power management module, and a warning and guidance module. The power management module includes a power switch, a first DC-DC buck converter, and a second DC-DC buck converter. The input terminals of the power switch are respectively connected to a solar panel and a storage battery, and the output terminals are respectively connected to an alarm guidance module and a first DC-DC step-down converter. The first DC-DC buck converter is connected to the controller and the radar sensor respectively through a low-dropout linear regulator. The first DC-DC buck converter is also connected to the second DC-DC buck converter. The second DC-DC step-down converter is connected to the warning and guidance module.

2. The traffic warning and guidance terminal device according to claim 1, characterized in that, The solar panel is connected to the power output terminal of the power switch via a diode array, and the output terminal of the battery is connected to the input terminal of the power switch.

3. The traffic warning and guidance terminal device according to claim 2, characterized in that, The output terminal of the power switch is connected to the first pin of the first DC-DC buck converter through the first filter circuit. The second pin of the first DC-DC buck converter is connected to a voltage divider circuit. The third pin is connected in sequence to the second filter circuit and the low dropout linear regulator. The output terminal of the low dropout linear regulator is connected to the controller through the third filter circuit. The fourth pin of the first DC-DC buck converter is connected to the collector, the base of the collector is connected to the first filter circuit and the controller, and the emitter is connected to the first pin of the second DC-DC buck converter. The output terminal of the power switch is connected to the second pin of the second DC-DC step-down converter through the switch interface of the warning and guidance module. The third and fourth pins of the second DC-DC buck converter are connected to the control interface of the warning and guidance module through an energy storage inductor; a buck circuit and a compensation circuit are connected in parallel between the output terminal of the energy storage inductor and the fifth pin of the second DC-DC buck converter.

4. The traffic warning and guidance terminal device according to claim 1, characterized in that, The warning guidance module includes a first warning light, which is used to change its state according to control commands to achieve trail warning.

5. The traffic warning and guidance terminal device according to claim 1, characterized in that, The housing includes a base, on which an anti-collision frame is fixed. The battery is fixed on the base and located inside the anti-collision frame. The radar sensor is disposed on the outer wall of the anti-collision frame. The anti-collision frame is equipped with four support columns, and the warning and guidance module is fixed between two adjacent support columns. A back plate is fixed between two adjacent support columns, and the controller and power management module are fixed on the inner wall of the back plate; The back panel is located on the opposite side of the warning and guidance module; The solar panel consists of three panels, two of which are positioned opposite each other and fixed between two adjacent support columns; the third solar panel is fixed to the free end of the support column.

6. A LoRa-based traffic warning and guidance system, characterized in that, Includes a server, which is connected to multiple terminal devices as described in claim 4 via a gateway device; The housing is also equipped with a LoRa communication module, and the controller is connected to the gateway device through the LoRa communication module.

7. The LoRa-based traffic warning and guidance system according to claim 6, characterized in that, The warning guidance module also includes a second warning light, which is connected to the controller; The second warning light is used to change its status according to the control commands issued by the server.

8. The LoRa-based traffic warning and guidance system according to claim 6, characterized in that, The gateway device includes multiple devices, and the multiple gateway devices are dynamically networked with each terminal device.

Images