Autopilot system asymptotic height control method
By coupling vertical speed preselecting and altitude preselecting functions in the autopilot system, using asymptotic altitude control method and alert prompts, the problems of cumbersome function switching and unclear alarm display in the prior art are solved, achieving the satisfaction of flight plans and improving the safety of the autopilot.
Patent Information
- Application Number
- CN202411738240.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-04-08
AI Technical Summary
In the existing autopilot system, the vertical speed preselect and altitude preselect functions need to be manually switched, which makes the driver unable to directly set the desired flight status, and the alarm display is unclear, which affects the driver's attention.
By coupling the vertical speed preselect and altitude preselect functions in the autopilot system, an asymptotic altitude control method is used to provide an altitude proximity warning and altitude deviation warning prompt based on the deviation of the current altitude of the aircraft from the desired altitude, and perform a "height capture" control mode during the altitude proximity process.
The aircraft is realized to fly at the vertical speed and altitude preset by the pilot, meet the flight plan, optimize the alarm display, and improve the safety of the use of the autopilot.
Smart Images
Figure CN119781507A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of flight control systems and relates to an asymptotic altitude control method for an autopilot system. Background Art
[0002] Common longitudinal control modes of the autopilot system include altitude hold, altitude preselection, vertical speed preselection and other modes. Among them, the vertical speed preselection and altitude preselection modes are set with independent control switches, and the vertical speed preselection function is used to adjust the vertical speed switch. When the switch is adjusted to a certain gear, the value shown on the gear scale is the preselected vertical speed value, and the preselected value is displayed on the PFD. When using the altitude preselection mode, the pilot manually presses the altitude preselection button on the AFCS control panel with the preset target altitude, and the aircraft flies according to the selected target altitude.
[0003] The shortcomings of this method are: first, the pilot needs to manually switch the vertical speed preselection and altitude preselection functions, and the pilot cannot set the desired flight status, thus affecting the expected plan; second, the displayed warning definition is not clear, and the pilot cannot directly grasp the status of the aircraft through the PFD screen, thus affecting the pilot's attention. Summary of the invention
[0004] Purpose of the invention: The present invention realizes the coupling of vertical speed preselection and altitude preselection functions, flies according to the vertical speed and altitude preset by the pilot, thereby meeting the flight plan, optimizing the warning display screen, and improving the safety of the use of the autopilot.
[0005] Technical solution:
[0006] A method for asymptotic altitude control of an autopilot system is provided, comprising:
[0007] When the absolute value of the deviation between the current altitude of the aircraft and the expected altitude is within the first preset range, and the aircraft is flying in the direction of the expected altitude, an altitude approach warning prompt is issued;
[0008] When the absolute value of the deviation between the current altitude of the aircraft and the expected altitude is within the second preset range, and the aircraft is flying in the opposite direction to the pre-selected altitude, an altitude deviation warning prompt is issued;
[0009] The lower limit value of the second preset range is greater than or equal to the upper limit value of the first preset range.
[0010] Furthermore, the altitude approach warning prompt method includes: the longitudinal channel modal display area of the PFD main screen changes from green "vertical speed" to yellow "altitude approach" and flashes, and at the same time, the AFCS vertical speed preselection indicator light flashes synchronously.
[0011] Furthermore, the high deviation warning prompt method includes:
[0012] The display in the longitudinal channel mode area of the PFD main screen changes from green "vertical speed" to yellow "altitude deviation" and flashes. At the same time, the AFCS vertical speed preselection indicator light flashes synchronously.
[0013] Furthermore, the method further comprises:
[0014] During the altitude approach process, when the absolute value of the deviation is less than or equal to the preset capture threshold, the "altitude capture" control mode is executed; the preset capture threshold is less than or equal to the lower limit value of the first preset range;
[0015] In the "altitude capture" control mode, the pilot is prompted by displaying and flashing the green "altitude capture" in the longitudinal modal area of the PFD main screen, and the vertical speed preselection indicator light of the AFCS flashes at the same time.
[0016] Furthermore, the method further comprises:
[0017] In the "Altitude Capture" control mode, the vertical speed preselected value is limited.
[0018] Furthermore, the method further comprises:
[0019] In the "altitude capture" control mode, when the absolute value of the deviation is less than or equal to the preset threshold, it will automatically enter the altitude hold mode and maintain the altitude at the pre-selected altitude; the preset threshold is less than the preset capture threshold.
[0020] Furthermore, the method further comprises:
[0021] In the "altitude capture" control mode, the pilot is allowed to select the longitudinal channel mode according to flight needs;
[0022] In response to a press of the vertical speed preselect button, exiting the altitude capture mode and entering the pitch hold mode;
[0023] or, in response to a pressing operation of the altitude hold button, exiting the altitude capture mode and entering the altitude hold mode;
[0024] or, in response to a pressing operation of the altitude pre-selection button, exiting the altitude capture mode and entering the altitude pre-selection mode;
[0025] Or, in response to the pulling operation of the joystick, the altitude capture mode is exited and the pitch control mode is entered.
[0026] Beneficial effects:
[0027] The present invention integrates the vertical speed preselection and altitude preselection functions, which can reduce the pilot's operating procedures and relieve the pilot's burden. The display warning prompt function is optimized to enable the pilot to understand the longitudinal control state of the aircraft and improve flight safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is highly close to the schematic diagram.
[0029] Figure 2 It is a schematic diagram of height deviation.
[0030] Figure 3 It is a schematic diagram of height capture.
[0031] Figure 4 It is a schematic diagram of the preselected vertical speed deviation. DETAILED DESCRIPTION
[0032] The vertical speed preselection function of the present invention is described in detail with reference to the accompanying drawings:
[0033] The pilot uses the vertical speed preselection switch on the AFCS to set the desired vertical speed, selects the desired altitude through the altitude preselection knob, and then presses the "vertical speed" switch on the pilot display and control console. The flight management computer processes and calculates the pitch angle, pitch angle rate, altitude change rate signal and the selected vertical speed signal of the sensor (inertial navigation, heading attitude, gyro assembly, atmospheric data system) to form a control instruction, which is amplified by the drive circuit to form a drive signal and sent to the actuator control unit to control the actuator to drive the elevator deflection, so that the aircraft flies at the preselected vertical speed and altitude. At the same time, the flight management computer displays the modal information of the autopilot system on the PFD screen.
[0034] Display alarm method description:
[0035] a) When the altitude deviation is within the range of 50m to 100m, if the pre-selected vertical speed is greater than 0m / s (the aircraft is flying toward the pre-selected altitude), an altitude proximity warning prompt will be issued, such as Figure 1 As shown, the prompt method is: the display of the longitudinal channel mode area of the main screen on the driving display and control console changes from green "vertical speed" to yellow "altitude approach" and flashes, and at the same time, the vertical speed pre-selection indicator light on the driving display and control console flashes synchronously;
[0036] b) When the altitude deviation is within the range of 50m to 100m, if the pre-selected vertical speed is less than 0m / s, an altitude deviation warning prompt will be issued, such as Figure 2 As shown, the prompt method is: the longitudinal channel mode area display on the main screen of the longitudinal channel driving display console changes from green "vertical speed" to yellow "altitude deviation" and flashes, and at the same time, the vertical speed pre-selection indicator light on the driving display console flashes synchronously;
[0037] c) When the altitude deviation is within the range of -100m to -50m, if the pre-selected vertical speed is greater than 0m / s, an altitude deviation warning prompt will be issued, such as Figure 2 As shown, the prompt method is: the longitudinal channel mode area display on the main screen of the driving display console changes from green "vertical speed" to yellow "altitude deviation" and flashes, and at the same time, the vertical speed pre-selection indicator light on the driving display console flashes synchronously;
[0038] d) When the altitude deviation is within the range of -100m to -50m, if the pre-selected vertical speed is less than 0m / s, an altitude approach warning prompt will be issued, such as Figure 1 As shown, the prompt method is: the longitudinal channel mode area display on the main screen of the longitudinal channel driving display console changes from green "vertical speed" to yellow "altitude approach" and flashes, and at the same time, the vertical speed pre-selection indicator light on the driving display console flashes synchronously;
[0039] e) During the altitude approach process, when |altitude deviation|≤50m, execute the "altitude capture" control mode;
[0040] f) In the "Altitude Capture" control mode, the system will prompt the pilot, such as Figure 3 As shown, the prompting method is to display and flash the green "altitude capture" in the longitudinal mode area of the main screen of the driving display and control console, and flash the vertical speed preselection indicator light on the driving display and control console at the same time;
[0041] g) In the "altitude capture" control mode, the vertical speed pre-selected value is limited to -3m / s-3m / s;
[0042] h) In the "altitude capture" control mode, when |altitude deviation|≤5m, the system will automatically enter the altitude holding mode and maintain the altitude at the pre-selected altitude;
[0043] i) In the “Altitude Capture” control mode, the pilot can select the longitudinal channel mode according to flight needs, as follows:
[0044] You can exit the altitude capture mode and enter the pitch hold mode by pressing the vertical speed preselect button;
[0045] You can exit the altitude capture mode and enter the altitude hold mode by pressing the altitude hold button;
[0046] You can exit the altitude capture mode and enter the pitch leveling mode by pressing the leveling button;
[0047] You can exit the altitude capture mode and enter the altitude preselection mode by pressing the altitude preselection button;
[0048] The altitude capture mode can be exited and the pitch control mode can be entered by pulling the joystick.
[0049] j) The system sets a pre-selected vertical speed deviation prompt. When the monitored height deviation is greater than 300 and the pre-selected vertical speed is less than 0m / s or the height deviation is less than -300m and the pre-selected vertical speed is greater than 0m / s, the pre-selected vertical speed value will turn yellow and flash like Figure 4 shown.
Claims
1. A method for asymptotic altitude control of an autopilot system, characterized in that: include: When the absolute value of the deviation between the current altitude of the aircraft and the expected altitude is within the first preset range, and the aircraft is flying in the direction of the expected altitude, an altitude approach warning prompt is issued; When the absolute value of the deviation between the current altitude of the aircraft and the expected altitude is within the second preset range, and the aircraft is flying in the opposite direction to the pre-selected altitude, an altitude deviation warning prompt is issued; The lower limit value of the second preset range is greater than or equal to the upper limit value of the first preset range.
2. The method according to claim 1, characterized in that The altitude approach warning prompt method includes: the longitudinal channel modal display area of the PFD main screen changes from green "vertical speed" to yellow "altitude approach" and flashes, and at the same time, the AFCS vertical speed preselection indicator light flashes synchronously.
3. The method according to claim 2, characterized in that Altitude deviation warning prompt methods include: The display in the longitudinal channel mode area of the PFD main screen changes from green "vertical speed" to yellow "altitude deviation" and flashes. At the same time, the AFCS vertical speed preselection indicator light flashes synchronously.
4. The method according to claim 1, characterized in that: The method further comprises: During the height approach process, when the absolute value of the deviation is less than or equal to the preset capture threshold, the "height capture" control mode is executed; the preset capture threshold is less than or equal to the lower limit value of the first preset range; In the "Altitude Capture" control mode, the pilot is prompted by displaying and flashing green "Altitude Capture" in the longitudinal modal area of the PFD main screen and flashing the vertical speed preselection indicator light of the AFCS.
5. The method according to claim 1, characterized in that The method further comprises: In the "Altitude Capture" control mode, the vertical speed preselected value is limited.
6. The method according to claim 5, characterized in that The method further comprises: In the "altitude capture" control mode, when the absolute value of the deviation is less than or equal to the preset threshold, it will automatically enter the altitude hold mode and maintain the altitude at the pre-selected altitude; the preset threshold is less than the preset capture threshold.
7. The method according to claim 6, characterized in that The method further comprises: In the "altitude capture" control mode, the pilot is allowed to select the longitudinal channel mode according to flight needs; In response to a press of the vertical speed preselect button, exiting the altitude capture mode and entering the pitch hold mode; or, in response to a pressing operation of the altitude hold button, exiting the altitude capture mode and entering the altitude hold mode; or, in response to a pressing operation of the altitude pre-selection button, exiting the altitude capture mode and entering the altitude pre-selection mode; Or, in response to the pulling operation of the joystick, the altitude capture mode is exited and the pitch control mode is entered.
8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.