Pilot seat height adjusting system and method

Abstract

The invention belongs to the technical field of aviation electric mechanisms, and relates to a pilot seat height adjusting system and method. The system comprises a motor, a ball screw pair, a position sensor, a logic and signal processing device, a speed reduction device and a limit position protection device. The motor drives a nut of the ball screw pair to rotate through the speed reducer; one end of a lead screw of the ball screw pair is connected with the seat through a lug ring; the logic and signal processing device is connected with the position sensor through a wire. The logic and signal processing device is also connected with the motor and is used for controlling the motor to move and monitoring the load current of the motor; and a positive and negative rotation control signal of the motor is connected with the limit position protection device through a wire.

Description

Technical Field

[0001] This invention belongs to the field of aviation electric mechanism technology, and relates to a pilot seat height adjustment system and method. Background Technology

[0002] The electric mechanism for adjusting the seat pan height is typically operated manually by the pilot. The pilot sends an ascending / descending signal to the motor, which rotates and outputs a motion mechanism to move the seat pan, thus achieving the adjustment. See details of the process. Figure 1 The main problem with traditional electric adjustment mechanisms for pilot seats is that each pilot needs to adjust the seat to a suitable eye position before boarding the aircraft. Each seat adjustment involves a certain degree of randomness and repetition, increasing preparation time. Furthermore, the position fluctuates significantly, resulting in inaccuracies. In severe cases, the position may exceed the required eye position range, causing pilots to experience discomfort while flying the aircraft and affecting flight safety and operational comfort. Summary of the Invention

[0003] The purpose of this invention is to provide a pilot seat height adjustment system and method that automatically adjusts to achieve a predetermined ideal seat position.

[0004] Technical solution A pilot seat height adjustment system includes: an electric motor 5, a ball screw assembly 1, a position sensor 7, a logic and signal processing device 9, a reduction gear 14, and an extreme position protection device 13; the electric motor 5 drives the nut 2 of the ball screw assembly 1 to rotate through the reduction gear 14; one end of the screw 3 of the ball screw assembly 1 is connected to the seat through an ear loop 4; the logic and signal processing device 9 is connected to the position sensor 7 through a wire; the logic and signal processing device 9 is also connected to the electric motor 5 to control the movement of the electric motor 5 and monitor the load current of the electric motor 5; the forward and reverse control signals of the electric motor 5 are connected to the extreme position protection device 13 through a wire.

[0005] Furthermore, the system also includes: a protective cover 6, a mounting ring 15, and a lower housing 22; the protective cover 6 and the position sensor 7 form an enclosing structure and are sleeved on the outside of the lead screw 2; the lower end of the lead screw 2 is provided with an annular groove; the mounting ring 15 is sleeved in the annular groove, and a detection needle mounting plate 17 is connected to the outer surface of the mounting ring 15; the detection needle mounting plate 17 is provided with an opening, and the detection needle 8 of the position sensor 7 is inserted into the opening.

[0006] Furthermore, the mounting ring 15 is provided with a limiting protrusion 16 on the side opposite to the detection needle mounting plate 17; the protective cover 6 is provided with a limiting groove 12 along the axial direction of the lead screw 3, and the limiting protrusion 16 slides in the limiting groove 12 to restrict the rotation of the mounting ring 15; the bottom of the protective cover 6 is also provided with a boss 11, which is installed in the bottom groove of the lower housing 22 to ensure the installation accuracy of the protective cover.

[0007] Furthermore, the system also includes: a limit position transmission device 18; the limit position transmission device 18 is a worm gear connection for transmission, the lower end of the worm 20 is provided with a gear, the gear on the nut 2 of the ball screw pair 1 drives the gear at the lower end of the worm 20 to rotate through meshing, the worm 20 meshes with the worm gear 21, the worm gear 21 drives the cam 21 of the limit position protection device 13 to rotate, when the lead screw 3 moves to the extreme position, the cam 21 will press the micro switch 25 of the limit position protection device 13, the micro switch 25 will disconnect the power supply line of the motor 5, and the mechanism will stop running; the limit position protection device is used to prevent the lead screw from exceeding the working stroke.

[0008] Furthermore, the system also includes a manual switch; when the manual switch is turned on, it directly controls the movement of the motor 5, and the priority of the output signal of the manual switch is higher than the priority of the output signal of the logic and signal processing device.

[0009] A method for adjusting the height of a pilot's seat, implemented based on the aforementioned system, includes the following steps: Step 1: Power on the system, perform a self-test, and collect the initial position of the position sensor and the motor load current I; see the data collection method below. Figure 2 As shown.

[0010] Step 2: Estimate the pilot's weight M using load current. 人 ; Step 3: Check if the system stores the pilot's weight M. 人 If the theoretical position data of the matching position sensor is available, proceed to step five; otherwise, proceed to step four. Step 4: Estimate the pilot's height based on the pilot's weight; calculate the theoretical seat height H1 based on the pilot's height, and calculate the theoretical position of the position sensor based on the theoretical seat height; Step 5: Control the motor to move based on the initial position and theoretical position of the position sensor, and adjust the seat height; Step Six: Check if a manual switch signal is received within the set time; if so, record the position sensor reading after manual switch adjustment, and record the pilot's weight M. 人 The theoretical position of the matched position sensor is updated to the actual position of the position sensor after manual switch adjustment. The overall process is as follows: Figure 3 .

[0011] Furthermore, in step two, the pilot's weight M is estimated. 人 The process is as follows: By collecting the operating current I and comparing it with the load characteristic curve function L, the pilot's weight M can be estimated. 人 ;

[0012] In the formula I U is the operating current, φ is the input voltage, ω is the motor efficiency, ω is the motor speed, and K is the adjustment coefficient. M 人 For the pilot's weight, M 椅 Actual seat weight, M 负 Let L(I) be the load weight under the operating current, and L(I) be the load characteristic curve function.

[0013] Furthermore, through the pilot's weight M 人 To estimate a pilot's height, consult an anthropometric percentile chart and calculate the estimated sitting height (H). i ;

[0014] In the formula To estimate the height of the seat basin, This is the compensation value for the seat / seat tray adjustment. The seat position automatically adjusts to the theoretical height. If the pilot still feels uncomfortable with the eye position, the pilot can manually adjust the seat position to achieve the target position. ;

[0015] In the formula The height of the seat basin at the target location. The height can be manually adjusted.

[0016] Furthermore, the theoretical position of the position sensor is calculated based on the seat height. h ;

[0017] In the formula h This represents the theoretical position of the position sensor. This represents the position difference between the displacement probe of the position sensor and the seat basin.

[0018] Beneficial effects A pilot seat height adjustment system and method are provided. The system automatically adjusts to achieve a predicted ideal seat position. If the seat is still uncomfortable, manual adjustment can be made to compensate, quickly reaching the target position, and the information is stored in an information acquisition system. An electric mechanism is used to adjust the height of the seat pan along the axial direction. When the seat reaches its vertical travel limit, the electric mechanism automatically brakes. The electric mechanism must have a position feedback function to transmit signals from any position within the effective travel range, accurately recording the target position. This helps the pilot maintain a suitable position during flight, reducing combat readiness preparation time, minimizing eye position discomfort caused by incorrect seat height adjustments during flight, and improving the consistency of eye position height for each pilot's flight. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of a traditional seat adjustment process.

[0021] Figure 2 Flowchart for data acquisition by position sensors.

[0022] Figure 3 This is a flowchart of a method for adjusting the height of a pilot's seat.

[0023] Figure 4 This is a schematic diagram of a pilot seat height adjustment system.

[0024] Figure 5 This is a schematic diagram of a ball screw assembly.

[0025] Figure 6 This is a schematic diagram of a position sensor.

[0026] Figure 7 This is a schematic diagram of the protective shield.

[0027] Figure 8 This is a schematic diagram of an extreme position protection device.

[0028] Figure 9 This is a schematic diagram of the speed reduction device.

[0029] Figure 10 This is a schematic diagram of the mounting ring.

[0030] Figure 11 This is a schematic diagram of a limit position transmission system.

[0031] Figure 12 This is a schematic diagram of the lower shell.

[0032] 1—Ball screw pair, 2—Nut, 3—Screw, 4—Earring, 5—Motor, 6—Protective cover, 7—Position sensor, 8—Detection pin, 9—Logic and signal processing device, 10—Screw protective cover, 11—Boss, 12—Position guide groove, 13—Extreme position protection device, 14—Reduction gear, 15—Mounting ring, 16—Limit protrusion, 17—Detection pin mounting plate, 18—Extreme position transmission device, 19—Turbine, 20—Worm gear, 21—Cam, 22—Lower housing, 23—Wire routing groove, 24—Sealing groove, 25—Micro switch. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0035] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0037] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0039] A pilot seat height adjustment system includes a logic and signal processing unit, a motor, a ball screw assembly, a reduction gear, and a position sensor. The forward / reverse and common terminals of the logic and signal processing unit are connected to the forward / reverse and common terminals of the motor. The motor drives the nut of the ball screw assembly to rotate via the reduction gear, and the nut causes the screw to move axially. A protective cover and the position sensor form an enclosure structure surrounding the screw. One end of the screw is connected to the seat via an clevis, which raises or lowers the seat during movement. The other end of the screw has an annular groove, and a mounting ring is fitted into the groove. A probe mounting plate is connected to the outer surface of the mounting ring, and an opening is provided on the probe mounting plate. The probe of the position sensor is inserted into the opening. The movement of the screw causes the probe of the position sensor to move, and the position sensor stores its theoretical position in the logic and signal processing unit.

[0040] The electric mechanism has a signal conflict handling device. When the electric mechanism receives both pilot control signals and automatic signals simultaneously, the logic and signal processing device will block the automatic signals, receive the manual signals, and simultaneously transmit the pilot's manual control signals to the aircraft, thus achieving signal conflict handling.

[0041] The mounting ring is constrained by a limiting groove in the protective cover, which facilitates its movement along the axial trajectory and prevents offset or jamming. Precise positioning and reduced errors are achieved through a position guide groove.

[0042] The lower end of the lead screw is provided with an annular groove; the mounting ring is sleeved in the annular groove, and the mounting ring and the lead screw are connected by a loose sleeve to ensure that the lead screw has a positioning and guiding function in the axial direction and will not be damaged by external misoperation.

[0043] When the electric mechanism reaches its limit position, it has a limit position protection device to prevent the lead screw from moving beyond its stroke and damaging the electric mechanism and the pilot's seat.

[0044] The limit position transmission device is a worm gear transmission device. When the lead screw is running, the worm gear drives the cam of the limit position protection device to rotate. When the lead screw moves to the limit position, the cam will press the micro switch of the limit position protection device. The micro switch will disconnect the power supply line of the motor and the mechanism will stop running. The advantage is that the transmission device has a compact structure and the cam mechanism effectively protects the micro switch from damage due to overtravel at the limit position, and can realize limit position braking.

[0045] A sealing groove is designed between the upper and lower shells, which is waterproof and prevents electromagnetic interference.

[0046] The linear displacement protective cover has a boss, which facilitates the installation and positioning of the protective cover and prevents damage to the linear displacement sensor caused by incorrect installation.

[0047] The housing is equipped with wiring channels, and the entire wiring harness of the electric mechanism is routed within the wiring channels of the housing, which has an electromagnetic shielding effect. The advantage is that it prevents the electromagnetic interference of the wires from affecting the performance of the mechanism and facilitates the overall disassembly and assembly of parts and components.

[0048] The upper part of the lead screw is fitted with a lead screw protective sleeve to prevent foreign objects and moisture from entering the housing cavity.

[0049] A method for adjusting the height of a pilot's seat, implemented based on the aforementioned system, includes the following steps: Step 1: Power on the system, perform a self-test, and collect the initial position of the position sensor and the motor load current I; see the data collection method below. Figure 2 As shown.

[0050] Step 2: Estimate the pilot's weight M using load current. 人 ; Step 3: Check if the system stores the pilot's weight M. 人 If the theoretical position data of the matching position sensor is available, proceed to step five; otherwise, proceed to step four. Step 4: Estimate the pilot's height based on the pilot's weight; calculate the theoretical seat height H1 based on the pilot's height, and calculate the theoretical position of the position sensor based on the theoretical seat height; Step 5: Control the motor to move based on the initial position and theoretical position of the position sensor, and adjust the seat height; Step Six: Check if a manual switch signal is received within the set time; if so, record the position sensor reading after manual switch adjustment, and record the pilot's weight M. 人 The theoretical position of the matched position sensor is updated to the actual position of the position sensor after manual switch adjustment. The overall process is as follows: Figure 3 .

[0051] In step two, the pilot's weight M is estimated. 人 The process is as follows: By collecting the operating current I and comparing it with the load characteristic curve function L, the pilot's weight M can be estimated. 人 ;

[0052] In the formula I U is the operating current, φ is the input voltage, ω is the motor efficiency, ω is the motor speed, and K is the adjustment coefficient. M 人 For the pilot's weight, M 椅 Actual seat weight, M 负 Let L(I) be the load weight under the operating current, and L(I) be the load characteristic curve function.

[0053] By pilot weight M 人 To estimate a pilot's height, consult an anthropometric percentile chart and calculate the estimated sitting height (H). i ;

[0054] In the formula To estimate the height of the seat basin, This is the compensation value for the seat / seat tray adjustment. The seat position automatically adjusts to the theoretical height. If the pilot still feels uncomfortable with the eye position, the pilot can manually adjust the seat position to achieve the target position. ;

[0055] In the formula The height of the seat basin at the target location. The height can be manually adjusted.

[0056] The theoretical position of the position sensor is calculated based on the seat height. h ;

[0057] In the formula h This represents the theoretical position of the position sensor. This represents the position difference between the displacement probe of the position sensor and the seat basin.

[0058] The electric mechanism has a signal conflict handling device. When the electric mechanism receives both pilot control signals and automatic signals simultaneously, the logic and signal processing device will block the automatic signals, receive the manual signals, and simultaneously transmit the pilot's manual control signals to the aircraft, thus achieving signal conflict handling.

[0059] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A pilot seat height adjustment system, characterized in that: The system includes: a motor, a ball screw pair, a position sensor, a logic and signal processing device, a speed reduction device, and an extreme position protection device. The electric motor drives the nut of the ball screw pair to rotate through the reduction gear; one end of the ball screw pair is connected to the seat through an ear ring. The logic and signal processing unit is connected to the position sensor via wires; the logic and signal processing unit is also connected to the motor to control the motor's movement and monitor the motor's load current. The forward and reverse control signals of the motor are connected to the limit position protection device via wires.

2. The system according to claim 1, characterized in that: The system also includes: a protective cover, a mounting ring, and a lower housing; The protective cover and the position sensor form an enclosing structure on the outside of the lead screw; the lower end of the lead screw is provided with an annular groove; the mounting ring is fitted inside the annular groove, and a detection pin mounting plate is connected to the outer surface of the mounting ring. The detection pin mounting plate is provided with an opening, and the detection pin of the position sensor is inserted into the opening.

3. The system according to claim 2, characterized in that: The mounting ring and the detection needle mounting plate are provided with a limiting protrusion on the opposite side; the protective cover is provided with a limiting groove along the screw axis, and the limiting protrusion slides in the limiting groove; the bottom of the protective cover is also provided with a boss, which is installed in the bottom groove of the lower housing.

4. The system according to claim 1, characterized in that: The system also includes: a limit position transmission device; the limit position transmission device is a worm gear structure, with a gear at the lower end of the worm. The gear on the ball screw pair nut drives the gear at the lower end of the worm to rotate through meshing. The worm meshes with the worm gear, and the worm gear drives the cam of the limit position protection device to rotate. When the screw moves to the extreme position, the cam presses the micro switch of the limit position protection device, the micro switch disconnects the power supply to the motor, and the mechanism stops running.

5. The system according to claim 1, characterized in that: The system also includes a manual switch; when the manual switch is turned on, it directly controls the movement of the motor, and the output signal of the manual switch has a higher priority than the output signal of the logic and signal processing device.

6. A method for adjusting the height of a pilot's seat, implemented based on the system described in any one of claims 1-5, characterized in that: The method includes the following steps: Step 1: Power on the system, perform self-test, and collect the initial position of the position sensor and the motor load current I; Step 2: Estimate the pilot's weight M using load current. 人 ; Step 3: Check if the system stores the pilot's weight M. 人 If the theoretical position data of the matching position sensor is available, proceed to step five; otherwise, proceed to step four. Step 4: Estimate the pilot's height based on the pilot's weight; calculate the theoretical seat height H1 based on the pilot's height, and calculate the theoretical position of the position sensor based on the theoretical seat height; Step 5: Control the motor to move based on the initial position and theoretical position of the position sensor, and adjust the seat height; Step Six: Check if a manual switch signal is received within the set time; if so, record the position sensor reading after manual switch adjustment, and record the pilot's weight M. 人 The theoretical position of the matched position sensor is updated to the actual position of the position sensor after manual switch adjustment.

7. The system according to claim 6, characterized in that: In step two, the pilot's weight M is estimated. 人 The process is as follows: By collecting the operating current I and comparing it with the load characteristic curve function L, the pilot's weight M can be estimated. 人 ; In the formula I U is the operating current, φ is the input voltage, ω is the motor efficiency, ω is the motor speed, and K is the adjustment coefficient. M 人 For the pilot's weight, M 椅 Actual seat weight, M 负 Let L(I) be the load weight under the operating current, and L(I) be the load characteristic curve function.

8. The system according to claim 7, characterized in that: By pilot weight M 人 To estimate a pilot's height, consult an anthropometric percentile chart and calculate the estimated sitting height (H). i ; In the formula To estimate the height of the seat basin, This is the compensation value for the seat / seat tray adjustment. The seat position automatically adjusts to the theoretical height. If the pilot still feels uncomfortable with the eye position, the pilot can manually adjust the seat position to achieve the target position. ; In the formula The target position is the height of the seat basin. The height can be manually adjusted.

9. The system according to claim 8, characterized in that: The theoretical position of the position sensor is calculated based on the seat height. h ; In the formula h This represents the theoretical position of the position sensor. This represents the position difference between the displacement probe of the position sensor and the seat basin.

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