Double-trim switch instruction selection method and system
By designing a dual trim switch command selection method, and utilizing the directional relationship and time threshold of the trim switch signals of the pilot and co-pilot, the problem of non-command trim caused by sticking or jamming faults was solved, thus improving the safety of flight control.
Patent Information
- Application Number
- CN202511464813.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-14
- Publication Date
- 2025-11-14
AI Technical Summary
Existing aircraft dual trim switches cannot disconnect when they are stuck or jammed, causing unauthorized system movements and affecting aircraft safety.
A dual trim switch command selection method is designed. By judging the directional relationship and validity of the driver and passenger trim switch signals, and combining the order of commands, the method selects the appropriate command and sets a time threshold to determine the priority, thereby avoiding non-command trim.
This effectively avoids uncommanded trim situations caused by trim switch failures, thus improving the safety of flight control.
Smart Images
Figure CN120942575A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of aircraft flight control system design, and specifically relates to a dual trim switch command selection method and system. Background Technology
[0002] The trim switches in an aircraft cockpit control system provide the pilot with an interface for aircraft trim and output trim signals to drive trim servos for cockpit-front trim or directly drive control surfaces for control surface trim, thereby reducing control load and improving flight quality. For single-seat aircraft, there is usually only one trim switch per axis, eliminating the need to choose between two commands. However, for two-seat aircraft, two trim switches per axis can be configured for use by two pilots, leading to the selection of two trim commands.
[0003] Currently, the use of dual trim switches on aircraft follows this logic: when a single command is valid, the system responds to that command; when both commands are valid, if they match, the system responds to the pilot's command; otherwise, it does not respond. Under normal circumstances, this trim logic meets operational requirements. However, when the trim switch malfunctions due to sticking or jamming and cannot be disconnected, this logic causes the system to continuously respond to the trim signal of the faulty switch, resulting in unauthorized system movements and affecting aircraft safety.
[0004] Therefore, how to design a safer method for selecting balance switch commands is a problem that needs to be solved. Summary of the Invention
[0005] The purpose of this application is to provide a dual-balance switch command selection method and system to solve the problem that existing balance switches affect the balance signal when they experience sticking or jamming faults and cannot be disconnected.
[0006] The technical solution of this application is: a dual-balance switch command selection method, comprising:
[0007] Based on the collected driver and passenger trim switch signals, the directional relationship between the two trim switch signals is obtained, and the validity of the two trim switch commands is determined.
[0008] The balance switch command is selected based on the validity and order of the two balance switch commands.
[0009] Preferably, when the trim switches for the driver and passenger are single-redundant switches, the trim command is valid only when a trim signal in one direction is valid.
[0010] When the trim switches for the driver and passenger are dual-redundant switches, the trim command is valid only when both redundancy signals for trimming in one direction are valid, and both redundancy signals for trimming in the other direction are invalid or only one is valid.
[0011] Preferably, when both the driver's and passenger's trim commands are invalid, the system maintains its current state.
[0012] Preferably, when one of the driver's and passenger's trim commands is valid and the other is invalid, the system responds with the valid command.
[0013] Preferably, when both the driver's and passenger's trim commands are valid:
[0014] When the driver's and passenger's trim commands appear simultaneously and are identical, the system responds to the driver's command;
[0015] If the driver's and passenger's trim commands appear simultaneously but are different, the system will not respond and will maintain the current state.
[0016] If the trim commands from the driver's side and the passenger's side appear sequentially, the later trim command has a higher priority. The system responds to the trim command that appears later and invalidates the earlier trim command. The trim switch of the trim command that appeared first returns to zero before a valid trim command appears. Otherwise, the trim command on the driver's side will remain invalid. Returning the trim switch to zero means that any trim signal from the trim switch in any direction is invalid.
[0017] Preferably, a time threshold is set. When the time difference between the trim commands of the driver and the passenger is greater than the time threshold, it is determined that the trim commands of the driver and the passenger appear sequentially; otherwise, it is determined that the trim commands of the driver and the passenger appear simultaneously.
[0018] As one specific implementation, a dual-balance switch command selection system includes a command validity judgment module and a command selection module;
[0019] The instruction validity judgment module is used to determine the validity of the two trim switch instructions by obtaining the directional relationship between the two trim switch signals based on the collected driver and passenger trim switch signals.
[0020] The instruction selection module is used to select the balance switch instruction based on the validity and sequence of the two balance switch instructions.
[0021] Preferably, in the instruction validity judgment module, when the trim switches of the driver's seat and the passenger seat are single-redundancy switches, the trim instruction is valid only when there is a valid signal for trimming in one direction.
[0022] When the trim switches for the driver and passenger are dual-redundant switches, the trim command is valid only when both redundancy signals for trimming in one direction are valid, and both redundancy signals for trimming in the other direction are invalid or only one is valid.
[0023] Preferably, in the instruction selection module, when both the driver's and passenger's trim instructions are invalid, the system maintains the current state.
[0024] Preferably, in the instruction selection module, when one of the driver's and passenger's trim instructions is valid and the other is invalid, the system responds with a valid instruction.
[0025] Preferably, in the instruction selection module, when both the driver's and passenger's trim instructions are valid:
[0026] When the driver's and passenger's trim commands appear simultaneously and are identical, the system responds to the driver's command;
[0027] If the driver's and passenger's trim commands appear simultaneously but are different, the system will not respond and will maintain the current state.
[0028] If the trim commands from the driver's side and the passenger's side appear sequentially, the later trim command has a higher priority. The system responds to the trim command that appears later and invalidates the earlier trim command. The trim switch of the trim command that appeared first returns to zero before a valid trim command appears. Otherwise, the trim command on the driver's side will remain invalid. Returning the trim switch to zero means that any trim signal from the trim switch in any direction is invalid.
[0029] Preferably, in the instruction selection module, a time threshold is set. When the time difference between the trim instructions of the driver and the passenger is greater than the time threshold, it is determined that the trim instructions of the driver and the passenger appear sequentially; otherwise, it is determined that the trim instructions of the driver and the passenger appear simultaneously.
[0030] The dual trim switch command selection method and system of this application take into account multiple states of the trim switches, and design the validity determination of the two trim switch signals and the command selection logic. It can meet the trim usage requirements of the aircraft and avoid non-command trim due to switch failure, thereby improving the safety of flight control. Attached Figure Description
[0031] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.
[0032] Figure 1 This is a schematic diagram of the overall process of Example 1. Detailed Implementation
[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0034] Example 1: A method for selecting dual-balance switch commands, such as... Figure 1 As shown, it includes the following steps:
[0035] Step S100: Determine the validity of the two trim switch commands based on the collected driver and passenger trim switch signals;
[0036] The method for determining the validity of a balance switch command is as follows:
[0037] a) When the trim switches for the driver and passenger are single-redundant switches, the trim command is valid only when there is a valid signal for trimming in one direction.
[0038] b) When the trim switch for the driver and passenger is a dual-redundant switch, the trim command is valid only when both redundancy signals for trimming in one direction are valid and both redundancy signals for trimming in the other direction are invalid or only one is valid.
[0039] Step S200: Select a balance switch command based on the validity of the two balance switch commands.
[0040] The specific method for selecting the balance switch command is as follows:
[0041] 1. When both the driver's and passenger's trim commands are invalid, the system maintains its current state;
[0042] 2. When one of the driver's and passenger's trim commands is valid and the other is invalid, the system responds with the valid command;
[0043] 3. When both the driver's and passenger's trim commands are valid:
[0044] When the driver's and passenger's trim commands appear simultaneously and are identical, the system responds to the driver's command;
[0045] If the driver's and passenger's trim commands appear simultaneously but are different, the system will not respond and will maintain the current state.
[0046] If the trim command from the driver's side and the passenger's side appears sequentially, the trim command that appears later has a higher priority. The system responds to the trim command that appears later and invalidates the trim command that appeared earlier. The trim command that appeared earlier will be valid only after the trim switch of the trim command that appeared earlier returns to zero. Otherwise, the trim command on the driver's side will remain invalid.
[0047] The balance switch returning to zero means that any balance signal from the balance switch in any direction is invalid, i.e., the switch has been released and returned to the zero position.
[0048] Preferably, a time threshold is set. When the time difference between the trim commands of the driver and the passenger is greater than the time threshold, it is determined that the trim commands of the driver and the passenger appear sequentially; otherwise, it is determined that the trim commands of the driver and the passenger appear simultaneously.
[0049] In summary, this application considers multiple states of the trim switch and designs the validity determination and command selection logic for the two trim switch signals, which can meet the trim requirements of the aircraft and avoid non-command trim due to switch failure, thereby improving the safety of flight control.
[0050] Example 2: A dual-balance switch command selection system, including a command validity judgment module and a command selection module.
[0051] The instruction validity judgment module is used to determine the validity of the two trim switch instructions by obtaining the directional relationship between the two trim switch signals based on the collected driver and passenger trim switch signals.
[0052] The instruction selection module is used to select the balance switch instruction based on the validity and sequence of the two balance switch instructions.
[0053] Preferably, in the instruction validity judgment module, when the trim switches of the driver's seat and the passenger seat are single-redundant switches, the trim instruction is valid only when the signal for trimming in one direction is valid.
[0054] When the trim switches for the driver and passenger are dual-redundant switches, the trim command is valid only when both redundancy signals for trimming in one direction are valid, and both redundancy signals for trimming in the other direction are invalid or only one is valid.
[0055] Preferably, in the instruction selection module, when both the driver's and passenger's trim instructions are invalid, the system maintains the current state.
[0056] Preferably, in the instruction selection module, when one of the driver's and passenger's trim instructions is valid and the other is invalid, the system responds with the valid instruction.
[0057] Preferably, in the instruction selection module, when both the driver's and passenger's trim instructions are valid:
[0058] When the driver's and passenger's trim commands appear simultaneously and are identical, the system responds to the driver's command;
[0059] If the driver's and passenger's trim commands appear simultaneously but are different, the system will not respond and will maintain the current state.
[0060] If the trim commands from the driver's side and the passenger's side appear sequentially, the later trim command has a higher priority. The system responds to the trim command that appears later and invalidates the earlier trim command. The trim switch of the trim command that appeared first returns to zero before a valid trim command appears. Otherwise, the trim command on the driver's side will remain invalid. Returning the trim switch to zero means that any trim signal from the trim switch in any direction is invalid.
[0061] Preferably, in the instruction selection module, a time threshold is set. When the time difference between the trim instructions of the driver and the passenger is greater than the time threshold, it is determined that the trim instructions of the driver and the passenger appear sequentially; otherwise, it is determined that the trim instructions of the driver and the passenger appear simultaneously.
[0062] It has the following advantages:
[0063] 1. It takes into account various combinations of balance switch states, covering a wide range of operating conditions;
[0064] 2. To prevent unauthorized balancing of the system when the balance switch is stuck or jammed and cannot be disconnected;
[0065] 3. Improve system security.
[0066] Finally, it should be noted that the accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.
[0067] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for selecting dual-balance switch commands, characterized in that, include: Based on the collected driver and passenger trim switch signals, the directional relationship between the two trim switch signals is obtained, and the validity of the two trim switch commands is determined. The balance switch command is selected based on the validity and order of the two balance switch commands.
2. The dual-balance switch command selection method as described in claim 1, characterized in that, When the trim switches for the driver and passenger are single-redundant switches, the trim command is valid only when the signal for trimming in one direction is valid. When the trim switches for the driver and passenger are dual-redundant switches, the trim command is valid only when both redundancy signals for trimming in one direction are valid, and both redundancy signals for trimming in the other direction are invalid or only one is valid.
3. The dual-balance switch command selection method as described in claim 2, characterized in that, When both the driver's and passenger's trim commands are invalid, the system maintains its current state.
4. The dual-balance switch command selection method as described in claim 2, characterized in that, When one driver's and one passenger's trim command is valid and the other is invalid, the system responds with the valid command.
5. The dual-balance switch command selection method as described in claim 2, characterized in that, When both the driver's and passenger's trim commands are active: When the driver's and passenger's trim commands appear simultaneously and are identical, the system responds to the driver's command; If the driver's and passenger's trim commands appear simultaneously but are different, the system will not respond and will maintain the current state. If the trim commands from the driver's side and the passenger's side appear sequentially, the later trim command has a higher priority. The system responds to the trim command that appears later and invalidates the earlier trim command. The trim switch of the trim command that appeared first returns to zero before a valid trim command appears. Otherwise, the trim command on the driver's side will remain invalid. Returning the trim switch to zero means that any trim signal from the trim switch in any direction is invalid.
6. The dual-balance switch command selection method as described in claim 5, characterized in that, Set a time threshold. If the time difference between the trim commands of the driver and passenger is greater than the time threshold, determine whether the trim commands of the driver and passenger occur sequentially; otherwise, determine whether the trim commands of the driver and passenger occur simultaneously.
7. A dual-balance switch command selection system, employing the method described in any one of claims 1-6, characterized in that, This includes an instruction validity determination module and an instruction selection module; The instruction validity judgment module is used to determine the validity of the two trim switch instructions by obtaining the directional relationship between the two trim switch signals based on the collected driver and passenger trim switch signals. The instruction selection module is used to select the balance switch instruction based on the validity and sequence of the two balance switch instructions.
8. The dual-balance switch command selection system as described in claim 7, characterized in that: In the instruction validity judgment module, when the trim switch of the driver's seat and the passenger's seat is a single redundancy switch, the trim instruction is valid only when the signal for trimming in one direction is valid. When the trim switches for the driver and passenger are dual-redundant switches, the trim command is valid only when both redundancy signals for trimming in one direction are valid, and both redundancy signals for trimming in the other direction are invalid or only one is valid.
9. The dual-balance switch command selection system as described in claim 8, characterized in that: In the instruction selection module, when both the driver's and passenger's trim instructions are invalid, the system maintains the current state.
10. The dual-balance switch command selection system as described in claim 8, characterized in that: In the instruction selection module, when one of the driver's and passenger's trim instructions is valid and the other is invalid, the system responds with the valid instruction.
11. The dual-balance switch command selection system as described in claim 8, characterized in that: In the instruction selection module, when both the driver's and passenger's trim instructions are valid: When the driver's and passenger's trim commands appear simultaneously and are identical, the system responds to the driver's command; If the driver's and passenger's trim commands appear simultaneously but are different, the system will not respond and will maintain the current state. If the trim commands from the driver's side and the passenger's side appear sequentially, the later trim command has a higher priority. The system responds to the trim command that appears later and invalidates the earlier trim command. The trim switch of the trim command that appeared first returns to zero before a valid trim command appears. Otherwise, the trim command on the driver's side will remain invalid. Returning the trim switch to zero means that any trim signal from the trim switch in any direction is invalid.
12. The dual-balance switch command selection system as described in claim 11, characterized in that: In the instruction selection module, a time threshold is set. When the time difference between the trim instructions of the driver and the passenger is greater than the time threshold, it is determined that the trim instructions of the driver and the passenger appear sequentially; otherwise, it is determined that the trim instructions of the driver and the passenger appear simultaneously.