Aircraft yoke trim control system
By introducing priority judgment logic into the aircraft control stick trim control system, and integrating manual trim, autopilot trim, and flap trim, the problems of frequent control stick adjustments and control jitter were solved, achieving high integration and flight safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- AVIC XAC COMMERCIAL AIRCRAFT CO LTD
- Filing Date
- 2022-08-29
- Publication Date
- 2026-06-09
AI Technical Summary
Existing aircraft control stick trim systems require frequent adjustments when the aircraft configuration changes, leading to pilot fatigue. Furthermore, multiple functions on the same hardware platform can easily cause control jitter.
Design an aircraft control stick trim control system that integrates manual trim, autopilot trim, and flap trim through priority level judgment logic to ensure coordinated operation of each function. Employ a trim controller, manual trim switch, autopilot controller, flap control computer, and trim actuator to realize priority level judgment and signal transmission.
It achieves a high degree of integration of multiple trim functions, saving weight and cost, while avoiding control jitter and improving flight safety.
Smart Images
Figure CN117657430B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of aircraft design, specifically to flight control system technology, and more specifically to an aircraft control stick trim control system. Background Technology
[0002] As is well known, modern fly-by-wire aircraft mostly use integrated systems, which typically employ integrated control technology to combine various similar functions. This greatly reduces the number of components required, thereby saving installation space and reducing weight, and significantly improving the aircraft's economy.
[0003] However, when multiple functions reside on the same hardware platform, the harmonious coexistence of these functions must be considered, and technology is needed to solve the adaptability of these functions.
[0004] Aircraft control stick trim typically involves connecting a rotary motor to the control stick force realization mechanism, which, when necessary, unloads the control force on the control stick or drives the control stick to move.
[0005] Many operational aircraft are designed with this "adaptability" in mind, primarily based on a "manual trim + automatic trim" architecture. When manual trim is activated, automatic trim is deactivated. This method is relatively simple and effectively avoids conflicts between manual and automatic trim. However, when the aircraft configuration changes, frequent adjustments to the control stick are still required to compensate for flight attitude, which may cause pilot fatigue.
[0006] Therefore, it is necessary to propose a new aircraft control stick trim control system architecture that organically integrates "manual trim + autopilot trim + flap trim" to ensure the effective operation of each trim function and achieve mutual coordination. Summary of the Invention
[0007] Based on the needs of aircraft development and the shortcomings of existing technologies, this invention proposes an aircraft control stick trim control system. This method achieves effective coordination and connection of three trim modes—manual trim, autopilot trim, and flap trim—through priority level judgment, thereby fully ensuring flight safety.
[0008] An aircraft control stick trim control system is characterized in that the control system includes a trim controller, a manual trim switch, an autopilot controller, a flap control computer, a trim actuator, and a control stick. The trim controller is interconnected with the manual trim switch, the autopilot controller, and the flap control computer, and the trim controller is interconnected with the control stick through the trim actuator.
[0009] The aircraft control stick trim control system is characterized in that the trim controller includes a manual trim control module, an autopilot trim module, a flap trim module, and a trim priority level determination module. The manual trim module generates a manual trim signal based on the state of the manual trim switch and sends it to the trim priority level determination module. The autopilot trim module generates an autopilot trim signal based on the autopilot actuator torque sent by the autopilot controller and sends it to the trim priority level determination module. The flap trim module generates a flap trim signal based on the flap angle change rate sent by the flap control computer and sends it to the trim priority level determination module. The trim priority level determination module has built-in trim priority level determination logic and outputs the trim rate corresponding to the priority trim signal to the trim actuator according to the trim priority level determination logic.
[0010] The beneficial effects of this application are as follows: 1) The present invention designs a balancing controller, which integrates multiple balancing functions into one device, resulting in high integration and saving weight and cost; 2) The balancing priority judgment logic ensures that only one control command controls the balancing actuator at any given time, avoiding the problem of control jitter caused by multiple control commands being sent to the same actuator.
[0011] The present application will be further described in detail below with reference to the accompanying drawings of the embodiments. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the aircraft control stick trim control system configuration.
[0013] Figure 2 This is a schematic diagram of the start-up logic for manual balancing control.
[0014] Figure 3 This is a schematic diagram of the priority judgment logic for balancing. Detailed Implementation
[0015] Referring to the attached figures, the design configuration of the aircraft control stick trim control system of this application is shown below. Figure 1The control system includes a trim controller, a manual trim switch, an autopilot controller, a flap control computer, trim actuators, and a control stick. The trim controller is interconnected with the manual trim switch, the autopilot controller, and the flap control computer, and is interconnected with the control stick via the trim actuators. The trim controller includes a manual trim control module, an autopilot trim module, a flap trim module, and a trim priority level determination module. The manual trim module generates a manual trim signal based on the state of the manual trim switch and sends it to the trim priority level determination module. The autopilot trim module generates an autopilot trim signal based on the autopilot actuator torque sent by the autopilot controller and sends it to the trim priority level determination module. The flap trim module generates a flap trim signal based on the flap angle change rate sent by the flap control computer and sends it to the trim priority level determination module. The trim priority level determination module has built-in trim priority level determination logic and outputs the trim rate corresponding to the priority trim signal to the trim actuator according to the trim priority level determination logic.
[0016] In implementation, the manual balancing switch has two redundancies, consisting of two parallel manual balancing switches. The manual balancing control module of the balancing controller determines whether to issue a manual balancing signal by judging the state of the two manual balancing switches. The manual balancing control module only issues a manual balancing signal when both manual balancing switches are pressed up or down simultaneously.
[0017] In practice, the automatic driving trimming module of the trimming controller determines whether to issue an automatic driving trimming signal based on the torque value of the automatic driving actuator sent by the automatic driving controller. Only when the torque value of the automatic driving actuator exceeds a predetermined threshold will the automatic driving trimming control module issue an automatic driving trimming signal.
[0018] In practice, the flap trim module of the trim controller determines whether to issue a flap trim signal based on the flap angle of the flap position sensor sent by the flap control computer and the rate of change of the flap angle. Only when the rate of change of the flap angle exceeds a predetermined threshold will the flap trim control module issue a flap trim signal.
[0019] In practice, the trim priority level judgment module of the trim controller prioritizes the three trim signals—manual trim signal, automatic trim signal, and flap trim signal—according to the trim priority level judgment logic. The trim controller only outputs the trim rate corresponding to the highest priority trim signal to the trim actuator.
[0020] In implementation, the trim priority level judgment module of the trim controller sets the priority levels of the three trim signals from high to low as follows: manual trim signal, autopilot trim signal, and flap trim signal. If the manual trim signal is activated, the autopilot trim signal and the flap trim signal are blocked. The trim priority level judgment module outputs the trim rate value corresponding to the manual trim signal to the trim actuator. If the manual trim signal is not activated, the autopilot trim signal takes priority. If the autopilot trim signal is activated, the flap trim signal is blocked. The trim priority level judgment module outputs the trim rate value corresponding to the autopilot trim signal to the trim actuator. When neither the manual trim signal nor the autopilot trim signal is activated, but the flap trim signal is activated, the trim priority level judgment module outputs the trim rate value corresponding to the flap trim signal to the trim actuator.
[0021] See the manual balancing control start-up logic. Figure 2 The commands from the first and second manual balancing switches are simultaneously sent to the manual balancing control module, which then determines whether to initiate a manual balancing command and whether the balancing direction is positive or negative. If the first manual balancing switch has no command input, no manual balancing command is triggered regardless of the command from the second manual balancing switch. If the first manual balancing switch command input is positive, a positive manual balancing command is triggered when the second manual balancing switch command is positive; otherwise, no manual balancing command is triggered. Conversely, if the first manual balancing switch command input is negative, a negative manual balancing command is triggered when the second manual balancing switch command is negative; otherwise, no manual balancing command is triggered when the second manual balancing switch is not activated or its command is positive.
[0022] See the logic for prioritizing balancing. Figure 3The trim priority level judgment module of the trim controller sets the priority levels of three trim signals from high to low as follows: manual trim signal, autopilot trim signal, and flap trim signal. If the manual trim signal is activated, the autopilot trim signal and flap trim signal are disabled. The trim priority level judgment module outputs the trim rate value corresponding to the manual trim signal to the trim actuator. The manual trim rate is ±5.5 mm / s. If the manual trim signal is not activated, the autopilot trim signal has priority. If the autopilot trim signal is activated, then... The flap trim signal is masked. The trim priority level judgment module outputs the trim rate value corresponding to the autopilot trim signal to the trim actuator. The torque start threshold of the autopilot trim signal is 10 Nm, and the autopilot trim rate is ±1.65 mm / s. When the manual trim signal and the autopilot trim signal are not activated, and the flap trim signal is activated, the trim priority level judgment module outputs the trim rate value corresponding to the flap trim signal to the trim actuator. The flap angle change rate start threshold of the flap trim signal is 1.5 degrees / s, and the flap trim rate is ±3.1 mm / s.
[0023] Assume: the first manual trim switch is not activated, the second manual trim switch issues a positive trim command, the torque on the autopilot actuator is 17 Nm, the flap control computer issues a flap angle change rate of 2 degrees per second, the manual trim control module analyzes and finds that the manual trim signal has not been activated, the trim control priority level judgment module determines that the autopilot trim signal has priority, blocks the flap trim signal, and outputs an autopilot trim rate command of 1.65 mm per second to the trim actuator. The trim actuator receives the command and drives the control stick forward.
[0024] Assume that at this time, the first manual trim switch issues a negative trim command and the second manual trim switch issues a negative trim command. The manual trim control module parses and obtains the manual trim signal. The trim control priority level judgment module determines that the manual trim signal has priority and outputs a rate command of -5.5 mm / s to the trim actuator. The trim actuator receives the command and drives the control stick backward.
Claims
1. An aircraft control stick trim control system, characterized in that, The control system includes a trim controller, a manual trim switch, an autopilot controller, a flap control computer, trim actuators, and a control stick. The trim controller is interconnected with the manual trim switch, the autopilot controller, and the flap control computer. The trim controller is interconnected with the control stick through the trim actuators. The trim controller includes a manual trim control module, an autopilot trim module, a flap trim module, and a trim priority level determination module. The manual trim module generates a manual trim signal based on the state of the manual trim switch and sends it to the trim priority level determination module. The autopilot trim module generates an autopilot trim signal based on the autopilot actuator torque sent by the autopilot controller and sends it to the trim priority level determination module. The flap trim module generates a flap trim signal based on the flap angle change rate sent by the flap control computer and sends it to the trim priority level determination module. The trim priority level determination module has built-in trim priority level determination logic and outputs the trim rate corresponding to the priority trim signal to the trim actuator according to the trim priority level determination logic.
2. The aircraft control stick trim control system as described in claim 1, characterized in that, The aforementioned manual balancing switch has two redundancies and contains two parallel manual balancing switches.
3. The aircraft control stick trim control system as described in claim 2, characterized in that, The manual balancing control module of the balancing controller determines whether to issue a manual balancing signal by judging the state of the two manual balancing switches. The manual balancing control module only issues a manual balancing signal when the two manual balancing switches are pressed up or down at the same time.
4. The aircraft control stick trim control system as described in claim 1, characterized in that, The automatic driving trimming module of the trimming controller determines whether to issue an automatic driving trimming signal based on the torque value of the automatic driving actuator sent by the automatic driving controller. Only when the torque value of the automatic driving actuator exceeds a predetermined threshold will the automatic driving trimming control module issue an automatic driving trimming signal.
5. The aircraft control stick trim control system as described in claim 1, characterized in that, The flap trim module of the trim controller determines whether to issue a flap trim signal based on the flap angle of the flap position sensor sent by the flap control computer and the rate of change of the flap angle. Only when the rate of change of the flap angle exceeds a predetermined threshold will the flap trim control module issue a flap trim signal.
6. The aircraft control stick trim control system as described in claim 1, characterized in that, The trim priority level judgment module of the trim controller prioritizes the three trim signals—manual trim signal, automatic trim signal, and flap trim signal—according to the trim priority level judgment logic. The trim controller only outputs the trim rate corresponding to the highest priority trim signal to the trim actuator.
7. The aircraft control stick trim control system as described in claim 1, characterized in that, The trim priority level judgment module of the trim controller sets the priority levels of three trim signals from high to low as follows: manual trim signal, autopilot trim signal, and flap trim signal. If the manual trim signal is activated, the autopilot trim signal and the flap trim signal are blocked. The trim priority level judgment module outputs the trim rate value corresponding to the manual trim signal to the trim actuator. If the manual trim signal is not activated, the autopilot trim signal takes priority. If the autopilot trim signal is activated, the flap trim signal is blocked. The trim priority level judgment module outputs the trim rate value corresponding to the autopilot trim signal to the trim actuator. When neither the manual trim signal nor the autopilot trim signal is activated, but the flap trim signal is activated, the trim priority level judgment module outputs the trim rate value corresponding to the flap trim signal to the trim actuator.