Serial port signal conversion system and method based on composite wing unmanned aerial vehicle

Abstract

The invention provides a serial port signal conversion system and method based on a composite-wing unmanned aerial vehicle, and the system comprises an RS full-duplex conversion module which is used for carrying out the full-duplex and point-to-multi-master-slave signal conversion with a serial port signal of the composite-wing unmanned aerial vehicle; the bus signal conversion module is used for performing half-duplex, point-to-point and / or multi-master signal conversion with serial port signals of the composite wing unmanned aerial vehicle; the isolation module is used for isolating current interference when the serial port signal is converted; the main control module is used for performing data conversion and packing on the serial port signal; the main control module is connected with the RS full duplex conversion module and the bus conversion module through the isolation module. A traditional signal conversion mode is converted into a CAN and RS485 dual-bus transmission mode, so that the anti-interference performance of signals can be enhanced, dual-margin control of control signals of avionics equipment of the composite wing unmanned aerial vehicle can be realized, the laying number of aircraft cables is reduced, and the reliability of the whole equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of UAV bus signal conversion, and particularly to a serial port signal conversion system and method based on a compound-wing UAV.

Background Art

[0002] With the rapid development of technology, the size of UAVs has been increasing day by day. From the initial small quadcopters to the current giant rotorcraft such as EVTOL, their functions and complexities have also been significantly improved. Especially in the communication of avionics equipment, these large UAVs have a more urgent need for communication speed and reliability. To ensure the safety and stability of UAVs during flight, the data transmission speed between avionics equipment must be greatly increased. At the same time, due to the increase in the size of UAVs, the involved communication systems are more complex, so the requirement for communication reliability has also reached an unprecedented level. The development trend of large-sized UAVs undoubtedly poses more stringent requirements on the communication technology of avionics equipment.

[0003] The existing test modules for CAN and 485 on the market are all independent and can only test the CAN or 485 bus separately, and cannot implement functions such as comprehensive testing, redundancy testing, and joint testing.

[0004] This limitation is particularly obvious in the testing of large UAVs. Due to the complexity of UAVs, it is necessary to comprehensively test multiple subsystems to ensure the normal operation of the system. Separate test modules cannot meet the needs of this comprehensive testing. Therefore, the existing technologies cannot effectively support the development and testing of large UAVs.

[0005] In summary, the existing testing technologies for CAN and 485 dual high-speed bus systems cannot meet the comprehensive testing requirements of large UAVs.

[0006] Therefore, it is necessary to study a serial port signal conversion system and method based on a compound-wing UAV to address the deficiencies of the existing technologies and solve or mitigate one or more of the above problems.

Summary of the Invention

[0007] In view of this, the present invention provides a serial port signal conversion system and method based on a compound-wing UAV, which converts the traditional signal conversion method into a transmission method of CAN and RS485 dual buses, which can not only enhance the anti-interference performance of the signal, but also achieve dual redundancy control of the control signal of the avionics equipment of the compound-wing UAV, simplify the laying quantity of the aircraft cables, and improve the reliability of the whole machine equipment.

[0008] On the one hand, the present invention provides a serial port signal conversion system based on a compound-wing UAV, and the serial port signal conversion system based on a compound-wing UAV includes:

[0009] The RS full-duplex conversion module is used for full-duplex and point-to-multiple master-slave signal conversion with the serial port signal of the compound-wing unmanned aerial vehicle.

[0010] The bus signal conversion module is used for half-duplex, point-to-point and / or multi-master signal conversion with the serial port signal of the compound-wing unmanned aerial vehicle.

[0011] The isolation module is used for current interference during the conversion of the isolated serial port signal.

[0012] The main control module is used for data conversion and packet assembly of the serial port signal.

[0013] The main control module is respectively connected to the RS full-duplex conversion module and the bus conversion module through the isolation module.

[0014] In the aspect and any possible implementation manner as described above, a further implementation manner is provided. The RS full-duplex conversion module includes an RS232 conversion unit and an RS422 conversion unit, and both the RS232 conversion unit and the RS422 conversion unit are connected to the main control module through the isolation module.

[0015] In the aspect and any possible implementation manner as described above, a further implementation manner is provided. The bus signal conversion module includes a CAN bus conversion unit and an RS485 conversion unit, and both the CAN bus conversion unit and the RS485 conversion unit are connected to the main control module through the isolation module.

[0016] In the aspect and any possible implementation manner as described above, a further implementation manner is provided. The CAN bus conversion unit is used for half-duplex and multi-master signal conversion with the serial port signal of the compound-wing unmanned aerial vehicle.

[0017] In the aspect and any possible implementation manner as described above, a further implementation manner is provided. The RS485 conversion unit is used for half-duplex and point-to-point signal conversion with the serial port signal of the compound-wing unmanned aerial vehicle.

[0018] In the aspect and any possible implementation manner as described above, a further implementation manner is provided. The main control module is an MCU, which is used for data conversion and packet assembly of the information collected by the sensor, the information returned by the electronic speed controller, and the data fed back through the serial port.

[0019] In the aspect and any possible implementation manner as described above, a further implementation manner is provided. The isolation module includes a first coupled magnetic isolation unit, a second coupled magnetic isolation unit, a third coupled magnetic isolation unit, and a fourth coupled magnetic isolation unit, and the first coupled magnetic isolation unit, the second coupled magnetic isolation unit, the third coupled magnetic isolation unit, and the fourth coupled magnetic isolation unit are all used for connecting the RS full-duplex conversion module and / or the bus signal conversion module to the main control module.

[0020] For the aspects and any possible implementation manners described above, a further implementation manner is provided. The first coupled magnetic isolation unit, the second coupled magnetic isolation unit, the third coupled magnetic isolation unit, and the fourth coupled magnetic isolation unit are connected to the main control module in an asynchronous communication manner.

[0021] For the aspects and any possible implementation manners described above, a further implementation manner is provided. The serial port signal conversion system based on the compound-wing unmanned aerial vehicle further includes a storage module. The storage module is connected to the main control module and is used for storing the conversion information of the serial port.

[0022] For the aspects and any possible implementation manners described above, a further implementation manner is provided. A serial port signal conversion method based on the compound-wing unmanned aerial vehicle is provided. The serial port signal conversion method performs serial port signal conversion through the serial port signal conversion system.

[0023] Compared with the prior art, the present invention can obtain the following technical effects:

[0024] 1), The flight control computer and the conversion module of the present invention adopt the CAN bus and the 485 bus communication modes. Both the CAN and 485 bus communications are two-wire differential signals, and twisted pair shielded cables are used as communication cables, greatly reducing the quantity and types of the whole machine cables and improving the anti-interference ability of the whole machine signals;

[0025] 2), The flight control computer and the conversion module of the present invention use dual-bus margin control to ensure that when one of the cables fails during the communication between the flight control computer and the conversion module, the device can still work normally;

[0026] 3), The conversion module of the present invention externally adopts isolated power supplies and isolated signals, ensuring the isolation between the whole aircraft avionics system and the power system and improving the electromagnetic compatibility of the whole aircraft;

[0027] 4), The present invention can receive and process data of CAN, 485, 422, 232, and TTL, and can perform data conversion on most devices on the market;

[0028] 5), The present invention has a data storage function, can provide a storage function with a memory of up to 64G, can store the received data, and has a function of automatically overwriting when the data is full, and can meet the user's daily recording and usage analysis of data.

[0029] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned technical effects simultaneously.

Description of the Drawings

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is the overall structure diagram of a serial port signal conversion system based on a compound-wing unmanned aerial vehicle provided by an embodiment of the present invention;

[0032] Figure 2 It is the structure diagram of the bus signal conversion module in a serial port signal conversion system based on a compound-wing unmanned aerial vehicle provided by an embodiment of the present invention.

Specific Embodiments

[0033] To better understand the technical solutions of the present invention, the following will describe the embodiments of the present invention in detail with reference to the drawings.

[0034] It should be clear that the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0035] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms of "a", "the", and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0036] As Figure 1 shown, the present invention provides a serial port signal conversion system based on a compound-wing unmanned aerial vehicle. The serial port signal conversion system based on a compound-wing unmanned aerial vehicle includes:

[0037] An RS full-duplex conversion module for performing full-duplex, point-to-multiple-master-slave signal conversion with the serial port signal of the compound-wing unmanned aerial vehicle;

[0038] A bus signal conversion module for performing half-duplex, point-to-point and / or multiple-master signal conversion with the serial port signal of the compound-wing unmanned aerial vehicle;

[0039] An isolation module for current interference during the conversion of the isolated serial port signal;

[0040] A main control module for performing data conversion and packet assembly on the serial port signal;

[0041] In a specific embodiment, the main control module is respectively connected to the RS full-duplex conversion module and the bus conversion module through the isolation module.

[0042] In a specific embodiment, the RS full-duplex conversion module includes an RS232 conversion unit and an RS422 conversion unit, and both the RS232 conversion unit and the RS422 conversion unit are connected to the main control module through an isolation module.

[0043] As Figure 2 shown, in a specific embodiment, the bus signal conversion module includes a CAN bus conversion unit and an RS485 conversion unit, and both the CAN bus conversion unit and the RS485 conversion unit are connected to the main control module through an isolation module.

[0044] In a specific embodiment, the CAN bus conversion unit is used for half-duplex and multi-master signal conversion with the serial port signal of the compound-wing unmanned aerial vehicle.

[0045] In a specific embodiment, the RS485 conversion unit is used for half-duplex and point-to-point signal conversion with the serial port signal of the compound-wing unmanned aerial vehicle.

[0046] In a specific embodiment, the main control module is an MCU, which is used for data conversion and packetization of the information collected by the sensor, the information returned by the electronic speed controller, and the data fed back through the serial port.

[0047] In a specific embodiment, the isolation module includes a first coupled magnetic isolation unit, a second coupled magnetic isolation unit, a third coupled magnetic isolation unit, and a fourth coupled magnetic isolation unit, and the first coupled magnetic isolation unit, the second coupled magnetic isolation unit, the third coupled magnetic isolation unit, and the fourth coupled magnetic isolation unit are all used to connect the RS full-duplex conversion module and / or the bus signal conversion module to the main control module.

[0048] In a specific embodiment, the first coupled magnetic isolation unit, the second coupled magnetic isolation unit, the third coupled magnetic isolation unit, and the fourth coupled magnetic isolation unit are connected to the main control module through asynchronous communication.

[0049] In a specific embodiment, the serial port signal conversion system based on the compound-wing unmanned aerial vehicle further includes a storage module, the storage module is connected to the main control module, and the storage module is used for storing the conversion information of the serial port.

[0050] The present invention also provides a serial port signal conversion method based on a compound-wing unmanned aerial vehicle, and the serial port signal conversion method performs serial port signal conversion through the serial port signal conversion system.

[0051] Embodiment 1:

[0052] The present invention provides a serial port signal conversion system based on a compound-wing unmanned aerial vehicle (UAV), which is mainly used to convert the traditional signal conversion method into a transmission method of CAN and RS485 dual buses. It can not only enhance the anti-interference performance of the signal, but also achieve the dual-margin control of the control signal of the avionics equipment of the compound-wing UAV, simplify the laying quantity of the aircraft cables, and improve the reliability of the whole machine equipment.

[0053] The serial port signal conversion system based on the compound-wing UAV of the present invention mainly consists of an RS422 module, an RS485 module, an RS232 module, and a CAN bus conversion module. Through each isolation module and conversion module respectively, the corresponding signals are converted into UART signals for communication with the MCU.

[0054] The serial port signal conversion includes the signal conversions of RS232, RS422, high-speed RS485 bus, and high-speed CAN bus. The highest transmission rate supported by the CAN bus is 1 Mbps, the highest transmission rate supported by the RS485 bus is 35 Mbps, the highest transmission rate supported by RS232 is 20 kbps, and the highest transmission rate supported by RS422 is 10 Mbps.

[0055] The bus signal conversion includes the CAN / RS485 bus, and its main function is to perform dual-bus communication with the flight control computer.

[0056] The isolation module adopts a dual-channel digital isolator based on the technology of Analog devices, Inc. Combining high-speed CMOS and monolithic transformer technologies, the isolation module provides excellent performance characteristics, superior to other alternatives such as optocouplers.

[0057] The storage module supports SD card expansion, with the highest support for a 64G memory card expansion. It can store the collected data and received instruction information, and has the function of automatically overwriting when the data is full.

[0058] The present invention converts the rotational speed information fed back by the traditional RS422, RS232, and RS485 avionics and electronic speed controllers used in compound-wing unmanned aerial vehicles, as well as information such as the voltage of the power battery, into a dual-bus mode based on CAN and RS485 for transmission to the flight control computer, and the two buses serve as backups for each other. CAN belongs to the category of fieldbuses. It is a serial communication network that effectively supports distributed control or real-time control, with a maximum transmission speed of 1 Mbps, a maximum communication distance of 10 km, a lossless bit arbitration mechanism, and a multi-master structure. RS485 uses a balanced transmission and differential reception method to achieve communication: the sending end converts the TTL level signal of the serial port into differential signals A and B for output. After being transmitted through the cable, the differential signals are restored to TTL level signals at the receiving end. Since the transmission line usually uses twisted pair and is a differential transmission, it has a strong ability to resist common-mode interference. The bus transceiver has a very high sensitivity and can detect a voltage as low as 200 mV. Therefore, the transmitted signal can be restored even kilometers away, and the maximum transmission rate can reach 10 Mb / s.

[0059] Since it is based on a dual-bus method, the number and types of devices added to the bus by this multifunctional signal conversion module are no longer limited by the number and types of serial ports of the flight control computer devices, and its anti-interference ability of signal transmission has also been greatly improved.

[0060] The signal conversion of the present invention is designed according to the communication methods required by the compound-wing unmanned aerial vehicle, and can convert the information of sensors at various positions on the aircraft, as well as multiple electronic speed controllers and servos, into CAN bus and RS485 bus for transmission to the main control device. It can also receive control instructions from the flight control computer on the CAN bus and RS485 bus to achieve the control of each device, reducing the number of cable layings. Due to its dual-bus control strategy, the reliability of the entire aircraft has also been improved.

[0061] The present invention can be used in conjunction with isolated power conversion, power voltage acquisition, and ECAP rotational speed acquisition. Moreover, it jointly forms a multifunctional signal conversion module design with the above three. The isolated power conversion module mainly converts the 110V - 9V power supply into the power supply voltage required by the circuit. And it has two-way power supply busbar functions, so that it can not only be powered by the aircraft's own generator, but also be powered by a 100V power battery, ensuring the safety of equipment power supply.

[0062] The PWM signal generation module can generate square wave signals with a frequency of 1 Hz to 1 MHz and a duty cycle of 0.00% to 100.00% to meet the requirements of some devices controlled by PWM signals such as electronic speed controllers and servos.

[0063] The power voltage acquisition module can acquire the external power supply voltage value from 0 to 500V and can acquire the external power supply voltage. The acquisition accuracy is 0.1V, and it can monitor the voltage of the power supply in real time.

[0064] The ECAP rotation speed acquisition module can acquire the PWM frequency signal of the external device, and the acquisition frequency ranges from 1.0Hz to 100kHz. It can meet the acquisition functions of the angle and rotation speed information for the control feedback of the servo and the electronic speed controller.

[0065] The above has introduced in detail a serial port signal conversion system and method based on a compound-wing unmanned aerial vehicle provided by an embodiment of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

[0066] As used in the specification and claims, certain terms are used to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as the criterion for distinction. As mentioned throughout the specification and claims, the terms "comprising" and "including" are open-ended terms, so they should be interpreted as "including / including but not limited to". "Roughly" means within an acceptable error range. Those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. The subsequent description in the specification is the preferred implementation manner for implementing the present application, but the description is for the purpose of explaining the general principle of the present application and is not used to limit the scope of the present application. The protection scope of the present application shall be subject to what is defined by the appended claims.

[0067] It should also be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a commodity or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0068] It should be understood that the term "and / or" used herein is only a kind of association relationship describing associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0069] The foregoing description has shown and described several preferred embodiments of the present application. However, as previously mentioned, it should be understood that the present application is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be changed within the scope of the inventive concept of the application described herein through the above teachings or the techniques or knowledge in the relevant field. Any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present application shall fall within the protection scope of the appended claims of the present application.

Claims

1. A serial port signal conversion system based on a composite wing UAV, characterized in that: The serial port signal conversion system based on the composite wing UAV includes: RS full-duplex conversion module, used for full-duplex, point-to-multi-master-slave signal conversion with the serial port signal of the composite wing UAV; A bus signal conversion module is used for half-duplex, point-to-point and / or multi-master signal conversion with the serial port signal of the composite wing UAV; Isolation module, used to isolate the current interference when converting serial port signals; The main control module is used for data conversion and packet assembly of serial port signals; The main control module is respectively connected to the RS full-duplex conversion module and the bus conversion module through the isolation module.

2. The serial port signal conversion system based on a composite wing UAV according to claim 1 is characterized in that: The RS full-duplex conversion module includes an RS232 conversion unit and an RS422 conversion unit, and both the RS232 conversion unit and the RS422 conversion unit are connected to the main control module via an isolation module.

3. The serial port signal conversion system based on a composite wing UAV according to claim 1 is characterized in that: The bus signal conversion module includes a CAN bus conversion unit and an RS485 conversion unit, and both the CAN bus conversion unit and the RS485 conversion unit are connected to the main control module through an isolation module.

4. The serial port signal conversion system based on a composite wing UAV according to claim 3 is characterized in that: The CAN bus conversion unit is used to perform half-duplex and multi-master signal conversion with the serial port signal of the composite wing UAV.

5. The serial port signal conversion system based on a composite wing UAV according to claim 3 is characterized in that: The RS485 conversion unit is used for half-duplex, point-to-point signal conversion with the serial port signal of the composite wing UAV.

6. The serial port signal conversion system based on a composite wing UAV according to claim 5 is characterized in that: The main control module is an MCU, which is used to convert and package the information collected by the sensor, the information returned by the electronic speed regulator, and the data fed back through the serial port.

7. The serial port signal conversion system based on a composite wing UAV according to claim 1 is characterized in that: The isolation module includes a first magnetic coupling isolation unit, a second magnetic coupling isolation unit, a third magnetic coupling isolation unit and a fourth magnetic coupling isolation unit. The first magnetic coupling isolation unit, the second magnetic coupling isolation unit, the third magnetic coupling isolation unit and the fourth magnetic coupling isolation unit are all used to connect the RS full-duplex conversion module and / or the bus signal conversion module with the main control module.

8. The serial port signal conversion system based on a composite wing UAV according to claim 7 is characterized in that: The first magnetic coupling isolation unit, the second magnetic coupling isolation unit, the third magnetic coupling isolation unit and the fourth magnetic coupling isolation unit are asynchronously communicated with the main control module.

9. The serial port signal conversion system based on a composite wing UAV according to claim 1 is characterized in that: The serial port signal conversion system based on the composite wing UAV also includes a storage module, which is connected to the main control module and is used to store serial port conversion information.

10. A serial port signal conversion method based on a composite wing UAV, characterized in that: The serial port signal conversion method performs serial port signal conversion by using the serial port signal conversion system described in any one of claims 1 to 9.

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