Self-adaptive heating device for total pressure sensor and heating control method

Abstract

The invention provides a total pressure sensor self-adaptive heating device and a heating control method.The total pressure sensor self-adaptive heating device comprises a total pressure sensor, a cable and a heating control assembly, the cable is composed of a heating wire and a thermocouple compensation wire, and the front end of the total pressure sensor is communicated with the outside atmosphere through a total pressure opening; the rear end of the total pressure sensor is connected with the heating control assembly through a cable composed of a heating wire and a thermocouple compensation wire, an armored heater is installed in a cavity of the total pressure sensor and used for heating the pipe wall, and a thermocouple is installed on the inner side of the pipe wall in an attached mode and used for sensing the temperature after heating. The front end of a cable composed of the heating wire and the thermocouple compensation wire is connected with a total pressure sensor, and the rear end of the cable composed of the heating wire and the thermocouple compensation wire is connected with a heating control assembly. The heating control assembly comprises a power supply module and a data processing and heating control module; and the data processing and heating control module is used for receiving wheel load, indicating airspeed information, acquiring a manual heating signal, acquiring the temperature of a thermocouple in a cavity of the total pressure sensor, realizing intelligent heating control and monitoring of the total pressure sensor, and sending a monitoring result to the atmosphere data computer.

Description

Technical Field

[0001] This invention belongs to the field of atmospheric data sensor heating control technology, specifically involving an adaptive heating device and heating control method for a total pressure sensor. Background Technology

[0002] During aircraft flight, in order to prevent the total pressure sensor tube head from becoming blocked by ice and causing incorrect total pressure data acquisition, a heater is usually installed inside the total pressure sensor cavity, and the heating is controlled by a heating control device according to the scenario and conditions.

[0003] In the existing technology, the total pressure sensor heating method is divided into ground heating control and air heating control according to the application scenario.

[0004] When the aircraft is on the ground, there are two heating control methods: 1) The operator manually turns on the heating power of the total pressure sensor according to the ground detection needs. In order to avoid the total pressure sensor burning dry on the ground at high power for a long time, the manual heating time is limited to no more than 1 minute; 2) The heating control device controls the heating power supply through the PWM wave of the DSP, thereby achieving the low-power heating mode of the total pressure sensor.

[0005] When the aircraft is in the air, there are two heating control methods: 1) After the aircraft takes off, the pilot manually presses to turn on the heating power of the total pressure sensor, and the total pressure sensor continuously heats up during the flight; 2) The heating control device controls the aircraft to continuously heat up in the air after takeoff through DSP control, and automatically cancels it after landing, without the need for manual operation.

[0006] The development of this technology takes into account the application scenarios of heating the total pressure sensor, protects ground operators from accidental burns, solves the problem of high-power heating of the ground total pressure sensor, and reduces the burden on pilots in using the heating function of the total pressure sensor.

[0007] However, existing technologies require manual control of heating duration or the use of hardware / software integrated circuits to control low-power heating to avoid prolonged high-power heating of the total pressure sensor on the ground. During flight, hardware / software integrated circuits are used for fully automatic, full-power heating. This heating control method introduces new problems in practical use. Low-power heating on the ground can easily lead to operators neglecting to turn off the control switch in time, increasing the complexity of heating checks. Prolonged heating can also easily cause the heating wire to overheat. Furthermore, using full-power heating for both non-icing and icing-prone areas in the air wastes aircraft energy and shortens the lifespan of the total pressure sensor heating wire. Summary of the Invention

[0008] This invention proposes an adaptive heating device for a total pressure sensor, which can solve the problems of high complexity in heating inspection and overheating of the heating wire.

[0009] The technical solution provided by this invention:

[0010] In a first aspect, this application provides a total pressure sensor adaptive heating device, comprising a total pressure sensor 1, a cable 2 composed of a heating wire and a thermocouple compensation wire, and a heating control component 3, wherein:

[0011] The front end of the total pressure sensor 1 is connected to the outside atmosphere through the total pressure port. The rear end of the total pressure sensor 1 is connected to the heating control component 3 through the cable 2 composed of heating wire and thermocouple compensation wire. The armored heater is installed inside the cavity of the total pressure sensor 1 to heat the pipe wall. The thermocouple is installed in close contact with the inner side of the pipe wall to sense the temperature after heating.

[0012] The front end of the cable 2, which consists of a heating wire and a thermocouple compensating wire, is connected to the total pressure sensor 1, and the rear end of the cable 2 is connected to the heating control component 3.

[0013] The heating control component 3 includes a power supply module 4 and a data processing and heating control module 5. The power supply module 4 provides the working voltage for other modules by passing the onboard power supply through reverse protection, filtering, soft start, and power conversion. The data processing and heating control module 5 is equipped with a microprocessor (MCU) module and an RS-422A interface to receive wheel load and airspeed information, collect manual heating signals, and collect the temperature of the thermocouple inside the total pressure sensor cavity. This enables intelligent heating control and monitoring of the total pressure sensor, and the monitoring results are sent to the atmospheric data computer.

[0014] Specifically, the working principle of the data processing and heating control component 5 is as follows: The aircraft provides a working power supply, which is converted into the power signal required by the power module for the data processing and heating control module to operate; the aircraft provides a heating power supply, which is used by the data processing and heating control module to realize the heating control and detection functions of the total pressure sensor; the aircraft provides a manual heating signal, which is collected by the power module and transmitted to the microprocessor in the data processing and heating control module in the form of discrete quantities. The microprocessor combines the airspeed and wheel load signals transmitted by the atmospheric data computer and the signals from the thermocouple in the total pressure sensor to finally realize the adaptive heating function.

[0015] Specifically, power module 4 includes a discrete signal circuit, a reverse protection circuit, a soft start circuit, a filter circuit, and a power conversion circuit. The discrete signal circuit transmits the manual heating signal from the optocoupler to the data processing and heating control module in discrete form. The working power supplied by the machine is protected against reverse voltage by the reverse protection circuit. The reverse-protected working power flows through the soft start circuit and the filter circuit. The power conversion circuit converts the filtered power into the power required for the product to operate.

[0016] Specifically, the data processing and heating control module 5 includes a thermocouple signal acquisition circuit, a heating detection and control circuit, an RS-422A bus transceiver circuit, a secondary power conversion circuit, and an MCU and its peripheral circuits.

[0017] Specifically, the thermocouple signal acquisition circuit acquires the low voltage signal output by the thermocouple in the total pressure sensor. After signal compensation and amplification, it is transmitted in analog form to the MCU and its peripheral circuits. The on-chip analog-to-digital converter of the MCU processes the signal. Based on the principle of the processing circuit, the resistance value is calculated from the converted value. Then, based on the sensor characteristics, the acquired physical quantity is calculated.

[0018] Specifically, the heating control circuit is implemented using the on-chip I / O port of the MCU. An optocoupler is selected to receive the heating control signal output after logic judgment. When the heating control signal is received, the optocoupler is turned on, driving the P-channel MOSFET to turn on, and the heating power supply circuit is turned on. When there is no heating control signal, the optocoupler is not turned on, is isolated from the P-channel MOSFET, and the heating is turned off. The heating detection circuit converts the current in the heating circuit into a DC voltage analog quantity through a Hall current sensor, and provides it to the MCU and the MCU in the peripheral circuit for signal conditioning; as the closed-loop control basis for determining the working status of this circuit.

[0019] Specifically, the RS-422A bus transceiver circuit is used to realize the function of receiving and transmitting RS-422A signals, and to realize the interaction between the wheel load, airspeed indication, and self-detection information provided by the air data computer and the MCU.

[0020] Specifically, the secondary power conversion circuit is used for voltage conversion to power the MCU and its peripheral circuits, as well as the RS-422A bus transceiver circuit; the MCU and its peripheral circuits include the MCU, crystal oscillator, and JTAG port.

[0021] Secondly, this application provides a heating control method for a total pressure sensor adaptive heating device, applied to the aforementioned total pressure sensor adaptive heating device, the method comprising:

[0022] Step 1: Initialize the adaptive heating device for the total pressure sensor;

[0023] Step 2: Perform a power-on self-test on the total pressure sensor adaptive heating device:

[0024] Step 3: Data processing and heating control module 5 collects information on indicated airspeed and wheel load;

[0025] Step 4: Data processing and heating control module 5 performs heating control based on the indicated airspeed and wheel load information:

[0026] Step 5: Perform periodic self-testing on the total pressure sensor adaptive heating device:

[0027] Step 6: Monitor the heating status of the adaptive heating device for the total pressure sensor:

[0028] Step 7: The total pressure sensor adaptive heating device outputs heating control signal, heating status, heating fault information and self-test results.

[0029] In summary, this invention proposes an adaptive heating device for a total pressure sensor, which can be directly applied to medium and small-sized UAVs. It collects the thermocouple temperature inside the total pressure sensor cavity in both ground-based and in-flight heating scenarios, and differentiates the control method based on the different thermocouple temperatures. Compared with existing technologies, this invention has two advantages:

[0030] 1. When the aircraft is on the ground, the heating power supply to the total pressure sensor is automatically cut off when the temperature of the thermocouple inside the total pressure sensor cavity exceeds 100°C. Compared with existing technologies, this can extend the service life of the heating wire of the total pressure sensor and reduce the workload of operators.

[0031] 2. When the aircraft is in the air, the heating power of the total pressure sensor is dynamically adjusted according to the temperature of the thermocouple inside the total pressure sensor cavity. This satisfies the anti-icing requirements of the total pressure sensor assembly while saving onboard energy consumption, meeting the needs of UAVs for energy saving, reduced consumption, and extended flight time. Currently, UAVs are often used in swarm warfare, involving a considerable number of UAVs. Mass production of the adaptive heating device for the total pressure sensor can reduce costs and has considerable economic benefits in the long run. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of an adaptive heating device for a total pressure sensor provided by the present invention;

[0033] Figure 2 A diagram illustrating the external cross-linking relationship of a total pressure sensor adaptive heating device provided by this invention;

[0034] Figure 3 A schematic diagram of a heating control component provided by the present invention;

[0035] Figure 4 A schematic block diagram of a power module 3 provided by the present invention;

[0036] Figure 5 A schematic diagram of a data processing and heating control module 4 provided by the present invention;

[0037] Figure 6 A software functional module structure diagram provided by the present invention;

[0038] Figure 7 A software flowchart provided for this invention;

[0039] Figure 8A software external interface diagram provided by the present invention;

[0040] The components are: 1-housing, 2-base plate, 3-power module, 4-data processing and heating control module, 5-cable, and 6-total pressure sensor assembly. Detailed Implementation

[0041] This application provides a total pressure sensor adaptive heating device to achieve adaptive intelligent heating functions on the ground and in the air.

[0042] Ground heating is performed while the aircraft is parked, using a responsive heating self-check function to inspect and maintain the heating elements, promptly identify and eliminate potential faults, and reduce the failure rate. If the detection function malfunctions, an alarm is triggered for timely ground intervention. In-flight heating is performed during flight, using an adaptive heating control function. Heating is controlled based on the temperature of the cavity where the heating wire is located, controlling the heating wire to operate within the icing-prone zone. An overheat protection design for the heating wire is also included, achieving both the anti-icing effect of heating the total pressure sensor and preventing the heating wire from being subjected to prolonged high temperatures, which could shorten its lifespan.

[0043] The aircraft's air and ground status is determined by receiving wheel load and indicated airspeed data from an air data computer via the RS-422A interface. When the aircraft's wheel load is on the ground and the indicated airspeed is less than or equal to the takeoff speed, the aircraft is determined to be on the ground; when the aircraft's wheel load is in the air or the indicated airspeed is greater than the takeoff speed, the aircraft is determined to be in flight.

[0044] When the aircraft is on the ground, the manual heating switch can be turned on to perform ground heating detection. When the thermocouple in the total pressure sensor cavity detects a cavity temperature of 100°C, the heating power supply is automatically cut off, and the heating detection result is maintained until the manual heating switch is turned off. When the aircraft is in the air, adaptive heating control is implemented. When the thermocouple in the total pressure sensor cavity detects a cavity temperature above 100°C, the heating power supply is automatically cut off. When the thermocouple in the total pressure sensor cavity detects a cavity temperature between 50°C and 100°C, low-power heating is implemented, and the low-power heating control mode is achieved through a periodic cycle of "heating, sleep, heating, sleep". When the thermocouple in the total pressure sensor cavity detects a cavity temperature below 50°C, normal power heating continues. During heating, the detection results are sent to the air data computer via the RS-422A interface.

[0045] This application provides a design for an intelligent heating control device and heating control method for a total pressure sensor. It is realized by relying on the physical devices of a total pressure sensor component and a heating control component. A thermocouple device is installed in the cavity of the total pressure sensor component near the pipe wall. The heating control component receives wheel load and airspeed information provided by an atmospheric data computer through a data bus, and collects the temperature of the thermocouple in the cavity of the total pressure sensor through an analog integrated circuit.

[0046] This heating control method is applicable to the following two situations:

[0047] 1. When the aircraft is in a ground-based state with "wheel load on the ground" and "indicated airspeed ≤ takeoff speed", a responsive intelligent heating control system is employed. Ground operators manually press the heating switch on the cockpit top control panel to initiate ground heating based on ground detection needs. The heating control component outputs heating control commands through the DSP's GPIO port to activate relays or optocouplers, further activating the heating power supply. Simultaneously, it collects the thermocouple signal from the total pressure sensor cavity. When the thermocouple temperature reaches 100°C, the heating power supply is automatically cut off; when the thermocouple temperature is below 100°C, low-power heating is performed periodically through a "heating-sleep-heating" cycle.

[0048] 2. When the aircraft is in the air (wheel load is in the air) or (indicated airspeed > takeoff speed), adjustable intelligent heating control is employed. The heating control component outputs heating control commands through the DSP's GPIO port to activate relays or optocouplers, further activating the heating power supply. Simultaneously, it collects the thermocouple signal from the total pressure sensor cavity. When the thermocouple temperature reaches 100°C, the heating power supply is automatically cut off; when the thermocouple temperature is between 50°C and 100°C, a periodic low-power heating cycle of "heating-sleep-heating" is performed; when the thermocouple temperature is below 50°C, full-power continuous heating is implemented.

[0049] Example 1

[0050] like Figures 1-2 As shown, this application provides a total pressure sensor adaptive heating device, including a total pressure sensor 1, a cable 2 composed of heating wires and thermocouple compensation wires, and a heating control component 3, wherein:

[0051] The front end of the total pressure sensor 1 is connected to the outside atmosphere through the total pressure port. The rear end of the total pressure sensor 1 is connected to the heating control component 3 through the cable 2 composed of heating wire and thermocouple compensation wire. The armored heater is installed inside the cavity of the total pressure sensor 1 to heat the pipe wall. The thermocouple is installed in close contact with the inner side of the pipe wall to sense the temperature after heating.

[0052] The front end of the cable 2, which consists of a heating wire and a thermocouple compensating wire, is connected to the total pressure sensor 1, and the rear end of the cable 2 is connected to the heating control component 3.

[0053] The heating control component 3 includes a power supply module 4 and a data processing and heating control module 5. The power supply module 4 provides the working voltage for other modules by passing the onboard power supply through reverse protection, filtering, soft start, and power conversion. The data processing and heating control module 5 is equipped with a microprocessor (MCU) module and an RS-422A interface to receive wheel load and airspeed information, collect manual heating signals, and collect the temperature of the thermocouple inside the total pressure sensor cavity. This enables intelligent heating control and monitoring of the total pressure sensor, and the monitoring results are sent to the atmospheric data computer.

[0054] Specifically, such as Figure 3 As shown, the heating control component includes a power supply module and a data processing and heating control module. The aircraft provides a 28VDC operating power supply, which is converted by the power supply module into ±15V and 5V power signals required for the data processing and heating control module to operate. The aircraft provides a 270VDC heating power supply, which, through the data processing and heating control module, enables heating control and detection functions for the total pressure sensor. The aircraft provides a manual heating signal, which the power supply module acquires and transmits in discrete form to the microprocessor within the data processing and heating control module. The microprocessor combines this signal with airspeed, wheel load, and other signals transmitted via an RS-422A interface from the atmospheric data computer, as well as signals from the thermocouple within the total pressure sensor, ultimately achieving adaptive heating functionality.

[0055] Specifically, such as Figure 4 As shown, power module 4 includes a discrete signal circuit, a reverse polarity protection circuit, a soft-start circuit, a filter circuit, and a power conversion circuit. The discrete signal circuit, after receiving the manual heating signal from the optocoupler, transmits it in discrete form to the data processing and heating control module. The 28VDC operating power supplied by the machine is protected against reverse voltage by the reverse polarity protection circuit's reverse voltage diode, effectively preventing damage to the product from reverse voltage connection. The reverse-polarized 28VDC operating power flows through the soft-start circuit and filter circuit, effectively suppressing inrush current and signal conduction interference. The power conversion circuit mainly converts the filtered 28V power into the +15V, -15V, and 5V power required for product operation.

[0056] Specifically, power module 4 performs the following functions:

[0057] a) Implement reverse polarity protection, power supply protection, and filtering for the 28V operating power supply;

[0058] b) Perform a power-on soft start;

[0059] c) Power conversion, converting the +28V DC power supplied on the machine to ±15V and +5V;

[0060] d) Acquire discrete signals from manual heating.

[0061] Specifically, such as Figure 5 As shown, the data processing and heating control module 5 includes a thermocouple signal acquisition circuit, a heating detection and control circuit, an RS-422A bus transceiver circuit, a secondary power conversion circuit, and an MCU and its peripheral circuits. The thermocouple signal acquisition circuit acquires the low-voltage signal output by the thermocouple in the total pressure sensor. After signal compensation and amplification, it is transmitted in analog form to the on-chip analog-to-digital converter (ADC) of the MCU and its peripheral circuits for processing. Based on the principle of the processing circuit, the resistance value is calculated from the converted value, and then the acquired physical quantity is calculated based on the sensor characteristics. The heating control circuit is implemented using the MCU's on-chip I / O ports. An optocoupler is used to receive the discrete heating control signal output after logical judgment. When a heating control signal is received, the optocoupler conducts, driving the P-channel MOSFET to conduct, thus connecting the heating power supply circuit (i.e., the 270VDC heating power supply provided on-board is connected to the heating control power supply of the total pressure sensor). When there is no heating control signal, the optocoupler does not conduct, isolating itself from the P-channel MOSFET, and heating is turned off. The heating detection circuit converts the current in the heating circuit into a DC voltage analog signal using a Hall current sensor, providing this signal to the MCU and its peripheral circuits for signal conditioning. This serves as the basis for closed-loop control in determining the operating status of this circuit. The RS-422A bus transceiver circuit is used to receive and transmit RS-422A signals, enabling the interaction between the air data computer and the MCU with information such as wheel load, indicated airspeed, and self-detection. The secondary power conversion circuit converts +5VDC to 3.3VDC for use by the MCU, its peripheral circuits, and the RS-422A bus transceiver circuit. The MCU and its peripheral circuits mainly consist of the MCU, a crystal oscillator, and a JTAG port. As a high-performance 32-bit MCU, it has a maximum operating speed of 168MHz, a 3.3V power supply, and a maximum operating frequency of 168MHz via an external crystal oscillator. It has 1MB of built-in solid-state memory and 192KBSRAM, and integrates a rich set of GPIO interfaces, SPI interfaces, timers, and a 12-bit AD conversion module on the chip. Most of its pins are 5V compatible. It has four USART serial asynchronous communication interfaces, which can realize RS-422A communication. Among them, USART1 can realize software online loading function.

[0062] Specifically, the data processing and heating control module 5 implements the following functions:

[0063] a) Converts +5V power to +3.3V signal to power devices such as MCU and RS-422A;

[0064] b) Acquire one channel of manual heating discrete signal;

[0065] c) One RS-422A port for transmitting and receiving signals;

[0066] d) Acquire one thermocouple signal;

[0067] e) Control the heating module via GPIO port;

[0068] f) Detect the heating status of the total pressure sensor.

[0069] Example 2

[0070] like Figure 6 As shown, this application provides a total pressure sensor adaptive heating device including total pressure sensor adaptive heating device software, the software including: system initialization, power-on self-test, input signal acquisition, periodic self-test, heating control, heating status monitoring, and parameter output functions.

[0071] like Figure 7 As shown, the software task structure of the total pressure sensor adaptive heating device is a sequential structure, and the main software flowchart is shown below. Figure 7 See the flowchart of the timer interrupt program on the left. Figure 7 right. Figure 7 After the main function of the left software starts, it first disables and clears all interrupts, initializes the MCU, initializes global data, initializes peripherals, enables interrupts again, starts power-on self-test, and enters the while(1) loop to wait for interrupts. Figure 7 After the right timer interrupt response program starts, it first performs a dog feed operation to avoid software reset, outputs the RS-422A data obtained in the previous cycle, then collects discrete quantities, collects analog quantities, and receives RS-422A data. Based on the collected and received information and data, it judges the heating control conditions and controls the heating of the total pressure sensor, monitors the heating status of the total pressure sensor, and finally performs periodic self-test and frame count accumulation.

[0072] like Figure 8 As shown, the external interface of the total pressure sensor adaptive heating device software includes 1 RS-422A input interface, 4 analog input interfaces for total pressure sensor heating voltage, total pressure sensor cavity thermocouple voltage, +15V voltage, ground voltage, 1 discrete input interface for manual heating signal, 1 discrete output interface, and 1 RS-422A output interface.

[0073] This application provides a heating control method for an adaptive heating total pressure sensor, applied to the adaptive heating device for the total pressure sensor provided in the above embodiments. The method includes:

[0074] Step 1: Initialize the adaptive heating device for the total pressure sensor;

[0075] Specifically, step 1 includes:

[0076] Step 11: Initialize the microprocessor: Complete the initialization of the clock, interrupts, timers, solid-state memory, GPIO interface, and related hardware modules according to the chip datasheet;

[0077] The timer interrupt period is 100ms.

[0078] Step 12: Initialize data: Initialize the relevant variables in the application software, initialize wheel load to ground, initialize indicated airspeed to 0km / h, initialize heating status to no heating, set heating monitoring results to normal, and initialize self-test results to normal.

[0079] Step 2: Perform a power-on self-test on the total pressure sensor adaptive heating device:

[0080] Specifically, step 2 includes: a self-test performed by the total pressure sensor adaptive heating device after it is powered on, and the test items include: calculation validity test and solid-state memory test.

[0081] Step 3: Data processing and heating control module 5 collects information on indicated airspeed and wheel load;

[0082] Specifically, step 3 includes:

[0083] Step 31: Receive one channel of RS-422A data sent from the air data computer, and parse the indicated airspeed and wheel load information;

[0084] Step 32: Acquire discrete signals from one manual heating switch and analyze whether the manual heating control is effective;

[0085] Step 33: Acquire the thermocouple voltage inside the total pressure sensor cavity through the analog-to-digital converter module, and calculate the temperature of the total pressure sensor assembly cavity by combining the temperature of the microprocessor chip itself as the cold junction.

[0086] Step 34: Collect the heating voltage, +15V voltage and ground voltage of the total pressure sensor thermocouple through the analog-to-digital conversion module.

[0087] Step 4: Data processing and heating control module 5 performs heating control based on the indicated airspeed and wheel load information:

[0088] Specifically, step 4 includes:

[0089] Step 41: Determine whether the aircraft is on the ground or in the air based on the wheel load and indicated airspeed. If the wheel load is in the air or the indicated airspeed is greater than the takeoff speed, determine that the aircraft is in the air and proceed to step 43. If the wheel load is on the ground and the indicated airspeed is less than or equal to the takeoff speed, determine that the aircraft is on the ground and proceed to step 42.

[0090] Step 42: If a valid signal from the manual heating switch is received on the ground, the ground heating function is activated; when the temperature of the thermocouple in the total pressure sensor cavity is greater than or equal to 100℃ or when an invalid signal from the manual heating switch is received, the ground heating function is deactivated; when the temperature of the thermocouple in the total pressure sensor cavity is less than 100℃, the periodic low-power heating function of "heating-sleep-heating" is adopted.

[0091] Preferably, when the aircraft is on the ground, a response-based detection heating function is used. The ground heating function is activated by outputting a heating control signal "1" through the corresponding GPIO port, and deactivated by outputting a heating control signal "0" through the corresponding GPIO port.

[0092] In practical applications, the heating time is controlled by the thermocouple temperature inside the total pressure sensor cavity and the effective signal from the manual heating switch. The heating detection result remains output even when the heating function is off, until the manual heating switch is turned off.

[0093] Step 43: When the aircraft is in the air, adaptive heating control is performed based on the temperature of the thermocouple inside the total pressure sensor cavity.

[0094] Specifically, step 43 includes: when the aircraft reaches the air state, the heating function is activated; when the thermocouple in the total pressure sensor cavity detects a cavity temperature of less than 50°C, full-power heating is continuously applied; when the thermocouple in the total pressure sensor cavity detects a cavity temperature of 50°C to 100°C, a periodic low-power heating function of "heating-sleep-heating" is adopted; when the temperature in the total pressure sensor cavity is greater than or equal to 100°C, the heating function is turned off.

[0095] Preferably, the heating function is started by outputting a heating control signal "1" through the corresponding GPIO port, and the heating function is turned off by outputting a heating control signal "0" through the corresponding GPIO port.

[0096] Preferably, the low-power heating control method is achieved through a periodic cycle of "start heating for 1 minute and stop heating for 1 minute".

[0097] Specifically, the heating function is turned off by outputting a heating control signal "0" through the corresponding GPIO port.

[0098] Step 5: Perform periodic self-testing on the total pressure sensor adaptive heating device:

[0099] Detection of communication faults in the RS-422A computer receiving atmospheric data, detection of heating faults in the total pressure sensor assembly, detection of analog-to-digital conversion function, and monitoring of +15V voltage.

[0100] Step 6: Monitor the heating status of the adaptive heating device for the total pressure sensor:

[0101] The total pressure sensor's heating voltage is collected, corrected for ground voltage to obtain the true voltage, and combined with the product's heating status ("heating in progress") to determine the heating monitoring results. When the heating status is "heating in progress" and the collected sensor heating voltage is greater than or equal to the threshold, the sensor heating monitoring result is judged as normal heating; when the heating status is "heating in progress" and the collected sensor heating voltage is less than the threshold, the sensor heating monitoring result is judged as heating fault.

[0102] Step 7: The total pressure sensor adaptive heating device outputs heating control signal, heating status, heating fault information and self-test results.

[0103] Specifically, step 7 includes:

[0104] Step 71: The MCU outputs a heating control signal "1" or "0" through one GPIO interface;

[0105] Step 72: The MCU outputs heating status, heating fault information and self-test results to the atmospheric data computer through one RS-422A bus interface.

[0106] The heating status includes heating in progress and not heating. The heating fault information includes heating normally and heating fault.

[0107] In summary, this application provides an adaptive heating device and method for a total pressure sensor. Ground heating employs a responsive intelligent heating control. After receiving a manual heating command, the heating control component responds by outputting a heating control signal through the GPIO port of the DSP. The DSP differentiates the control method based on the temperature of the thermocouple inside the total pressure sensor cavity. When the thermocouple temperature reaches 100℃, the heating power is automatically cut off; when the thermocouple temperature is below 100℃, a periodic low-power heating cycle of "heating-sleep-heating" is used until the manual heating command is cancelled. Aerial heating employs adjustable intelligent heating control. The DSP differentiates the control method based on the temperature of the thermocouple inside the total pressure sensor cavity. When the thermocouple temperature reaches 100℃, the heating power is automatically cut off; when the thermocouple temperature is between 50℃ and 100℃, a periodic low-power heating cycle of "heating-sleep-heating" is performed; when the thermocouple temperature is below 50℃, normal power continuous heating is maintained. The temperature value can be adjusted according to the characteristics of the selected heating wire of the total pressure sensor.

Claims

1. A total pressure sensor adaptive heating device, characterized in that, It includes a total pressure sensor (1), a cable (2) consisting of heating wires and thermocouple compensation wires, and a heating control assembly (3), wherein: The front end of the total pressure sensor (1) is connected to the outside atmosphere through the total pressure port. The rear end of the total pressure sensor (1) is connected to the heating control component (3) through a cable (2) composed of heating wire and thermocouple compensation wire. An armored heater is installed inside the cavity of the total pressure sensor (1) to heat the pipe wall. A thermocouple is installed on the inner side of the pipe wall to sense the temperature after heating. The front end of the cable (2) composed of heating wire and thermocouple compensation wire is connected to the total pressure sensor (1), and the rear end of the cable (2) composed of heating wire and thermocouple compensation wire is connected to the heating control component (3). The heating control component (3) includes a power supply module (4) and a data processing and heating control module (5); the power supply module (4) provides the working voltage for other modules by passing the on-board working power supply through anti-reverse, filtering, soft start and power conversion; the data processing and heating control module (5) is equipped with a microprocessor MCU module and an RS-422A interface to receive wheel load and airspeed information, collect manual heating signals, collect the temperature of thermocouples in the total pressure sensor cavity, realize intelligent heating control and monitoring of the total pressure sensor, and send the monitoring results to the atmospheric data computer.

2. The adaptive heating device for the total pressure sensor according to claim 1, characterized in that, Working principle of data processing and heating control component (5): The machine provides working power, which is converted into the power signal required by the power module for the data processing and heating control module to work; the machine provides heating power, which is used by the data processing and heating control module to realize the heating control and detection function of the total pressure sensor; the machine provides manual heating signal, which is collected by the power module and transmitted to the microprocessor in the data processing and heating control module in the form of discrete quantity. The microprocessor combines the air speed, wheel load signal and the thermocouple signal in the total pressure sensor transmitted by the atmospheric data computer to finally realize the adaptive heating function.

3. The adaptive heating device for the total pressure sensor according to claim 1, characterized in that, The power module (4) includes a discrete quantity circuit, a reverse protection circuit, a soft start circuit, a filter circuit, and a power conversion circuit. The discrete quantity circuit transmits the manual heating signal from the optocoupler to the data processing and heating control module in discrete form. The working power supplied by the machine is protected against reverse voltage by the reverse protection circuit. The reverse-protected working power flows through the soft start circuit and the filter circuit. The power conversion circuit is used to convert the filtered power into the power required for the product to work.

4. The adaptive heating device for the total pressure sensor according to claim 1, characterized in that, The data processing and heating control module (5) includes a thermocouple signal acquisition circuit, a heating detection and control circuit, an RS-422A bus transceiver circuit, a secondary power conversion circuit, and an MCU and its peripheral circuits.

5. The adaptive heating device for the total pressure sensor according to claim 4, characterized in that, The thermocouple signal acquisition circuit acquires the low voltage signal output by the thermocouple in the total pressure sensor. After signal compensation and amplification, it is transmitted in analog form to the MCU and its peripheral circuits. The on-chip analog-to-digital converter of the MCU is used for processing. According to the principle of the processing circuit, the resistance value is calculated from the conversion value. Then, according to the sensor characteristics, the acquired physical quantity is calculated.

6. The adaptive heating device for the total pressure sensor according to claim 4, characterized in that, The heating control circuit is implemented using the on-chip I / O port of the MCU. An optocoupler is used to receive the heating control signal output after logic judgment. When a heating control signal is received, the optocoupler conducts, driving the P-channel MOSFET to conduct, and the heating power supply circuit is turned on. When there is no heating control signal, the optocoupler does not conduct, is isolated from the P-channel MOSFET, and the heating is turned off. The heating detection circuit converts the current in the heating circuit into a DC voltage analog quantity through a Hall current sensor, and provides it to the MCU and its peripheral circuits for signal conditioning. This serves as the basis for closed-loop control in determining the operating status of the circuit.

7. The adaptive heating device for the total pressure sensor according to claim 4, characterized in that, The RS-422A bus transceiver circuit is used to receive and transmit RS-422A signals, enabling the interaction between the air data computer and the MCU with information on wheel load, airspeed indication, and self-detection.

8. The adaptive heating device for the total pressure sensor according to claim 1, characterized in that, The secondary power conversion circuit is used for voltage conversion to power the MCU and its peripheral circuits, as well as the RS-422A bus transceiver circuit; the MCU and its peripheral circuits include the MCU, crystal oscillator, and JTAG port.

9. A heating control method for a total pressure sensor adaptive heating device, characterized in that, The method of the adaptive heating device for the total pressure sensor, applied to any one of claims 1 to 8, comprises: Step 1: Initialize the adaptive heating device for the total pressure sensor; Step 2: Perform a power-on self-test on the total pressure sensor adaptive heating device: Step 3: Data processing and heating control module (5) collects information on indicated airspeed and wheel load; Step 4: Data processing and heating control module (5) performs heating control based on indicated airspeed and wheel load information: Step 5: Perform periodic self-testing on the total pressure sensor adaptive heating device: Step 6: Monitor the heating status of the adaptive heating device for the total pressure sensor: Step 7: The total pressure sensor adaptive heating device outputs heating control signal, heating status, heating fault information and self-test results.

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