Multi-device universal gesture input system based on friction nano-generator

Abstract

The invention discloses a multi-device universal gesture input system based on a friction nanometer generator, which belongs to the technical field of gesture recognition and specifically comprises a flexible gesture plate body consisting of a slidable substrate and a friction nanometer power generation unit matrix, power generation units are connected into a dynamic network through flexible wires, the substrate is of a multi-layer laminated structure, and the friction nanometer power generation unit matrix is arranged on the substrate. The device is provided with an anti-bending supporting layer, a deformation conducting layer and a replaceable friction interface layer. The wear detection module collects electric signal characteristics of the power generation unit, and constructs a local dynamic wear evaluation model in combination with response differences of adjacent units; the driving and adjusting module is provided with a micro linear motor array and a shape memory alloy support, when abrasion exceeds a threshold value, a motor drives the gesture plate to translate in multiple directions, the support adjusts the curvature of the plate surface, and a low-abrasion area is switched; the control module establishes a spatial wear map according to historical and real-time physiological features of a patient, plans a displacement strategy, and selects a low-wear area as a new operation interface.

Description

Technical Field

[0001] The present invention relates to the technical field of gesture recognition, and in particular to a multi-device universal gesture input system based on a friction nanogenerator. Background Art

[0002] In today's digital age, human-computer interaction technology has developed rapidly, and various intelligent devices are widely used in all aspects of people's lives. Gesture input, as a natural and intuitive way of human-computer interaction, has gradually become a research hotspot. It allows users to interact with devices through simple hand movements without complicated key operations, greatly improving the convenience and efficiency of interaction. In many fields such as medical rehabilitation, smart home, virtual reality, etc., gesture input systems have broad application prospects, bringing people a more intelligent and humanized user experience.

[0003] At present, the gesture input system based on friction nanogenerator (TENG) has attracted the attention of many researchers due to its advantages such as self-power supply and high sensitivity. This system uses the coupling effect of friction electrification and electrostatic induction to convert mechanical energy into electrical energy to realize the perception and recognition of gesture movements. The existing TENG-based gesture input system usually consists of a gesture board and a detection circuit. There are multiple friction nano-power generation units distributed on the gesture board. When the user slides, clicks, etc. on the gesture board, the power generation unit will generate corresponding electrical signals. These electrical signals are analyzed and processed by the detection circuit to realize the recognition of gestures. This provides some elderly people and seriously ill patients with the convenience of expressing their needs through gesture input.

[0004] However, since some patients have difficulty moving their fingers, they can only rub and input on a small area of ​​the gesture board for a long time, causing wear and tear in this small area. Wear problems are prone to occur, resulting in a decline in the performance of the power generation unit and affecting the accuracy and stability of gesture recognition. The existing system lacks an effective wear detection and response mechanism, and is unable to detect and deal with wear in a timely manner. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-device universal gesture input system based on a friction nanogenerator to solve the following technical problems: Some users rub and input on a small area of ​​the gesture pad for a long time, causing wear and tear in this small area. Wear problems are prone to occur, affecting the accuracy and stability of gesture recognition. The existing system lacks an effective wear detection and response mechanism, and is unable to detect and deal with wear and tear in a timely manner.

[0006] The purpose of the present invention can be achieved through the following technical solutions: The multi-device universal gesture input system based on friction nanogenerator includes a flexible gesture board body, a wear detection module, a drive adjustment module and a control module, wherein: The flexible gesture board body includes a slidable substrate and a friction nano-power generation unit matrix. Each power generation unit forms a dynamic connection network through flexible wires. The substrate adopts a multi-layer stacking design, including a bottom anti-bending support layer, a middle deformation conduction layer and a top replaceable friction interface layer. The wear detection module collects the electrical signal waveform characteristics of each power generation unit in real time, extracts the charge peak attenuation rate, contact impedance nonlinear change and signal noise spectrum characteristics, and combines the collaborative response differences of adjacent power generation units to build a dynamic wear assessment model for the local area; The drive adjustment module includes a micro linear motor array and a shape memory alloy bracket. When it is detected that the wear level of the target area exceeds a preset threshold, the linear motor array drives the gesture board to translate in multiple directions along the guide rail, and at the same time uses the pre-programmed deformation characteristics of the shape memory alloy bracket to adjust the curvature of the board surface, so that the patient's finger contact area is adaptively switched to a low-wear area; The control module establishes a spatial wear probability distribution map based on the patient's historical operation data and real-time physiological characteristics, generates a gesture board displacement strategy through a dynamic path planning algorithm, and preferentially selects the area with the lowest wear accumulation risk as the new operation interface.

[0007] As a further solution of the present invention: the friction nano power generation unit of the flexible gesture board body is divided into a high-frequency contact area and a low-frequency contact area; The surface of the power generation unit in the high-frequency contact area is covered with a self-healing composite material layer, which includes a flowable repair agent encapsulated in microcapsules and a photoresponsive polymer matrix. When triggered by mechanical friction or external light, the repair agent seeps out and fills the micro cracks, and the photoresponsive polymer solidifies and repairs the interface through a cross-linking reaction. The surface of the power generation unit in the low-frequency contact area is etched with radial micro grooves, and the wear is guided to spread to the edge of the power generation unit through directional texture, and a redundant electrode array is pre-set; Each power generation unit is connected by an elastic hinge structure. When stress is applied, a small relative displacement occurs between the power generation units, and a porous energy absorption layer is set at the bottom of the power generation unit.

[0008] As a further solution of the present invention: the flexible gesture board body includes a plurality of independently detachable sub-modules, and when a sub-module reaches the life limit standard, it is replaced through a magnetic suction interface.

[0009] As a further solution of the present invention: the process of the wear detection module constructing a dynamic wear assessment model for a local area is as follows: The peak value of the charge of each friction nano-power generation unit in the continuous triggering cycle is normalized, and its decay slope relative to the initial value is calculated. When the decay slope exceeds twice the average value of the adjacent power generation units, it is marked as a potential wear power generation unit; By applying a micro-current to detect the dynamic changes in the contact impedance between the power generation units, if the correlation between the impedance growth rate and the charge decay rate in a certain area exceeds the preset threshold, and the impedance continues to grow for more than the set time, it is determined to be structural wear; Collect the sliding trajectory data of the patient's finger in the target area, extract the trajectory length, curvature and speed distribution characteristics, and when the trajectory repetition rate is higher than the set threshold and the signal recognition error rate rises to the set threshold simultaneously, it is confirmed that the area has entered a high wear state; According to the marking of potential wear power generation units, structural wear and high wear conditions, the wear areas are graded and marked. Only when the signal attenuation, impedance change and trajectory repeatability meet the set conditions at the same time, the drive adjustment module is triggered to perform area switching.

[0010] As a further solution of the present invention: the process of adaptively switching the area of ​​the drive adjustment module is: The micro linear motor array drives the gesture board in an asymmetric stepping mode, moving alternately along the X / Y axis direction, and the displacement of each time is dynamically adjusted according to the real-time wear degree to ensure that the natural placement position of the patient's finger always covers the unworn area; During the translation process, the shape memory alloy bracket produces preset deformation according to the curvature requirements of the target area, so that a micro-convex or concave structure is formed on the surface of the gesture board, guiding the patient's fingers to naturally deviate to the low-wear area; when the translation operation is not enough to cover the available area, the micro-motor drives the gesture board to rotate around the central axis, and the rotation angle matches the range of motion of the patient's finger joints, redistributing the contact pressure by changing the angle distribution of the board surface; After each switching action, reverse micro-displacement is automatically performed to release internal stress, and the temperature rise and vibration signals of the drive components are monitored, and prompts are given when the temperature rise and vibration signals are abnormal.

[0011] As a further solution of the present invention: before the driving adjustment module drives the gesture board to move horizontally, the piezoelectric brake generates micro-vibration of a specific frequency to prompt the patient that a zone switch is about to occur.

[0012] As a further solution of the present invention: the process of the control module establishing the spatial wear probability distribution map is: Integrate the patient's daily operation time distribution, finger pressure intensity heat map and environmental temperature and humidity historical data to establish a multi-dimensional wear correlation model; Use time series analysis to predict the cumulative wear trend of all operating areas, calculate the remaining life of each power generation unit based on the fatigue characteristics of the panel material, and generate a risk level stratification map; Plan the movement path of the gesture board according to the risk level layered map, give priority to the diagonal direction or edge area as the new operation interface, and when the available area decreases, enable the spiral diffusion strategy to migrate the use area in stages from the wear center to the periphery; The patient's adaptability to area switching is recorded, and when a decrease in operating efficiency is detected, the path planning weight coefficient is automatically adjusted.

[0013] As a further solution of the present invention: it also includes an intelligent self-maintenance module: When it is detected that the patient has not operated for a long time, the gesture board position is automatically reset, so that the starting position of the next operation cycle deviates from the historical wear area by at least two power generation unit spacings, and the wear debris adsorbed on the surface is removed by a micro vibrator; A high-voltage pulse electric field is applied during the displacement process, so that the particles generated by wear are charged and captured by the preset electrostatic adsorption layer; The benchmark test mode of all power generation units is activated regularly, and the parameter threshold of the wear assessment model is dynamically updated by comparing the consistency of the signal output of each power generation unit under standard pressure. The full-stroke homing operation is performed at a fixed time every day to eliminate the accumulated displacement error and lubricate the guide structure.

[0014] Beneficial effects of the present invention: The present invention collects the waveform characteristics of the electrical signal of the power generation unit in real time, extracts the peak attenuation rate of the charge, the nonlinear change of the contact impedance and the signal noise spectrum characteristics, and constructs a dynamic wear assessment model in combination with the difference in the coordinated response of adjacent units. It can accurately identify potential wear units, structural wear and high wear states, and provide a basis for subsequent adjustments. In response to the wear problem, the micro linear motor array of the drive adjustment module drives the gesture board to translate in multiple directions in an asymmetric stepping mode, and the shape memory alloy bracket adjusts the curvature of the board surface. It can also drive the gesture board to rotate, and can adaptively switch to the low wear area. After each switch, the reverse micro displacement releases stress and monitors the status of the components. The control module establishes a spatial wear probability distribution map based on the patient's historical operations and real-time physiological characteristics, plans the gesture board displacement strategy, gives priority to the low wear area, and adjusts the path planning weight according to the operation efficiency. It effectively solves the problems of insufficient wear detection, inability to adaptively adjust and lack of self-maintenance in the existing gesture input system, and improves the stability, reliability and service life of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of a module of the present invention; Figure 2 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 2 As shown, the present invention is a multi-device universal gesture input system based on a friction nanogenerator, including a flexible gesture board body, a wear detection module, a drive adjustment module and a control module, wherein: The flexible gesture board body is the core component, which consists of a slidable substrate and a friction nano-power generation unit matrix. A dynamic connection network is built between the power generation units with the help of flexible wires to ensure smooth transmission of electrical signals under different gesture operations. The substrate adopts a multi-layer stacking structure. The bottom anti-bending support layer can enhance the stability of the overall structure and reduce damage caused by daily bending; the middle deformation conduction layer can accurately transmit finger movements to the power generation unit; the top replaceable friction interface layer directly contacts the finger and can be easily replaced after wear to maintain system performance. The wear detection module plays a monitoring role, collecting the electrical signal waveform characteristics of the power generation unit in real time, extracting the peak attenuation rate of the charge, the nonlinear change of the contact impedance and the signal noise spectrum characteristics, and comprehensively considering the differences in the coordinated responses of adjacent power generation units to construct a dynamic wear assessment model for local areas and detect wear risks in a timely manner. The drive adjustment module includes a micro linear motor array and a shape memory alloy bracket. Once the wear detection module determines that the wear of the target area exceeds the preset threshold, the micro linear motor array drives the gesture board to translate in multiple directions along the guide rail. At the same time, the shape memory alloy bracket adjusts the curvature of the board according to the pre-programmed deformation characteristics, prompting the patient's finger contact area to adaptively switch to a low-wear area, effectively addressing the wear problem and extending the use time of the gesture board. The control module is like the "command center" of the system. It constructs a spatial wear probability distribution map based on the patient's historical operation data and real-time physiological characteristics, uses a dynamic path planning algorithm to generate a gesture board displacement strategy, and prioritizes areas with low wear accumulation risk as new operation interfaces to improve system efficiency and stability.

[0019] In a preferred embodiment of the present invention, the friction nano-power generation unit of the flexible gesture board body is scientifically divided into a high-frequency contact area and a low-frequency contact area to adapt to the wear characteristics in different usage scenarios.

[0020] The high-frequency contact area, as the part most frequently operated by users, is subjected to a large amount of mechanical friction. In order to effectively improve the durability of this area, the surface of the power generation unit is covered with a self-healing composite material layer. This composite material layer is composed of a flowable repair agent encapsulated in microcapsules and a photoresponsive polymer matrix. When the high-frequency contact area encounters mechanical friction in daily use or is triggered by external light, the flowable repair agent encapsulated in the microcapsules will quickly seep out. These repair agents can accurately fill the microscopic cracks generated on the surface of the power generation unit and effectively prevent the cracks from further expanding. At the same time, the photoresponsive polymer matrix undergoes a cross-linking reaction under the corresponding conditions, so that the repaired interface can be solidified, restoring the integrity and functionality of the surface of the power generation unit, and greatly extending the service life of the power generation unit in the high-frequency contact area. The wear pattern of the low-frequency contact area is different, considering its relatively low frequency of use. The surface of the power generation unit in this area is etched with radial micro grooves. The design of these micro grooves is unique, and its directional texture can guide the wear to the edge of the power generation unit to avoid local excessive wear. In addition, a redundant electrode array is pre-set in the low-frequency contact area. Once the power generation unit has some electrodes damaged due to long-term use, the redundant electrode array can be quickly put into operation to ensure that the power generation function in this area is not affected and maintain the stable operation of the system. In addition, each power generation unit is connected by an elastic hinge structure. This structure allows a small relative displacement between the power generation units when stress is applied. This feature helps to disperse the concentrated stress caused by external forces and prevent a power generation unit from being damaged due to excessive stress. At the same time, a porous energy absorption layer is set at the bottom of the power generation unit. The energy absorption layer can effectively absorb the energy generated by external impact, further protect the power generation unit from mechanical damage, and improve the reliability of the entire flexible gesture board body. In a more optimized situation of the present embodiment, the flexible gesture board body is composed of several independently detachable sub-modules. Each sub-module has a relatively independent function. When a sub-module reaches the life limit standard due to long-term use, there is no need to replace the entire flexible gesture board body, which greatly reduces the maintenance cost. Users can easily and conveniently remove the sub-module that has reached the life limit and replace it with a new sub-module only through the magnetic interface. The design of the magnetic interface not only makes the replacement operation of the sub-module simple and efficient, but also ensures that the newly replaced sub-module is firmly and well electrically connected to other parts, ensuring that the performance of the entire flexible gesture board body is not affected, and continues to provide users with stable gesture input services.

[0021] In another preferred embodiment of the present invention, the wear detection module undertakes the important task of constructing an accurate local area dynamic wear assessment model. First, for each friction nano power generation unit, the system will conduct an in-depth analysis of its charge peak value during the continuous trigger cycle. In this link, normalization is the key first step. By normalizing the charge peak value, the differences in the initial performance of different power generation units can be eliminated, making subsequent comparisons and analyses more scientific and comparable. On this basis, the decay slope of the peak value of the charge of the power generation unit relative to the initial value is calculated. This decay slope intuitively reflects the trend of the performance of the power generation unit over time. When the decay slope of a power generation unit exceeds twice the average value of the adjacent power generation units, the system will keenly mark it as a potential wear power generation unit. This means that the power generation unit may have begun to show signs of performance degradation due to wear and tear, and requires special attention. Next, the system applies microcurrent to detect the dynamic changes in contact impedance between power generation units. In actual operation, the change in contact impedance is closely related to the wear of the power generation unit. When the correlation between the impedance growth rate and the charge decay rate in a certain area exceeds the preset threshold, it indicates that there is a close correlation between the two, which is likely caused by wear. In addition, if the impedance of the area continues to grow for more than the set time, the system will determine that structural wear has occurred in the area. This structural wear often means that the physical structure inside the power generation unit has been severely damaged, posing a greater threat to the stability and reliability of the system. In addition, the wear detection module will actively collect the sliding trajectory data of the patient's fingers in the target area. Through advanced data acquisition technology, the system can accurately extract key information such as trajectory length, curvature and speed distribution characteristics. When the trajectory repetition of the target area is higher than the set threshold, it means that the area is frequently used and prone to wear. At the same time, if the signal recognition error rate also rises to the set threshold, this is a strong signal that the wear in the area has seriously affected the system's accurate recognition of gesture signals. At this point, the system will confirm that the area has entered a high wear state. Finally, based on the accurate marking of potential wear power generation units, structural wear and high wear conditions, the wear detection module will grade the wear areas. This graded marking provides a clear basis for subsequent processing. It is worth noting that the system sets strict trigger conditions. Only when the three key factors of signal attenuation, impedance change and trajectory repeatability meet the set conditions at the same time, will the drive adjustment module be triggered to perform area switching. This design ensures the accuracy and necessity of the area switching operation, avoids unnecessary actions caused by misjudgment, and thus ensures that the entire multi-device universal gesture input system based on friction nanogenerators can operate stably and efficiently, providing users with continuous and reliable gesture input services.

[0022] In another preferred embodiment of the present invention, the drive adjustment module undertakes the extremely critical task of adaptively switching regions, and its operation process is highly intelligent and accurate. As one of the core components that drives the gesture board to move, the micro linear motor array works in a unique asymmetric stepping mode. In actual operation, the array drives the gesture board to move alternately along the X / Y axis. The displacement each time is not fixed, but is dynamically adjusted based on the wear data collected in real time. In this way, it can cleverly ensure that the patient's fingers always cover the unworn area when they are placed naturally. For example, when the system detects that the degree of wear in a certain area of ​​the gesture board is high, the micro linear motor array will increase the displacement accordingly and quickly adjust the unworn area to under the patient's finger to ensure the smoothness of the user's operation and the reliability of the system. At the same time, in the process of the gesture board's translation, the shape memory alloy bracket plays an indispensable auxiliary role. The shape memory alloy bracket can accurately produce preset deformations according to the curvature requirements of the target area. This deformation will form a micro-convex or concave structure on the surface of the gesture board. When the patient operates on the gesture board, these special structures can guide the patient's fingers to naturally deviate to the low-wear area. For example, if the low-wear area is at the edge of the gesture board, the shape memory alloy bracket can make the edge area slightly convex, and use ergonomic principles to guide the patient's fingers to move subconsciously to this area, thereby reducing the frequency of use of high-wear areas and further extending the service life of the gesture board.

[0023] When the translation operation cannot meet the needs of covering all available areas, the drive adjustment module will start another important function. At this time, the micromotor will drive the gesture board to rotate around the central axis. The rotation angle has been carefully designed to highly match the range of motion of the patient's finger joints. Through this rotation operation, the angle distribution of the gesture board can be changed, thereby redistributing the contact pressure. For example, if a corner area of ​​the gesture board is excessively worn, the corner area can be adjusted to a position that is difficult for the patient's fingers to reach by rotating the gesture board, while placing the unworn or low-wear area at a more convenient angle to achieve reasonable optimization of the contact pressure and improve the overall performance of the system. After each switching action is completed, in order to ensure the stability and safety of the system, the drive adjustment module will automatically perform a reverse micro-displacement operation. The purpose of this operation is to release the stress accumulated inside the system due to frequent driving, and to avoid damage to system components caused by stress concentration. In addition, the system will also monitor the temperature rise and vibration signals of the drive components in real time. When an abnormal increase in temperature is detected, exceeding the normal operating temperature range, or an abnormal fluctuation in the vibration signal, it indicates that the drive component may have a potential failure risk. At this time, the system will immediately issue a prompt to remind maintenance personnel to conduct timely inspections and maintenance to ensure the stable operation of the entire multi-device universal gesture input system based on friction nanogenerators. It is worth pointing out that before the drive adjustment module drives the gesture board to move horizontally, a micro-vibration of a specific frequency will be generated through the piezoelectric brake. This micro-vibration signal can promptly and effectively remind the patient that a zone switch is about to occur. This humanized design allows the patient to know the system's actions in advance during the operation, avoiding operational errors caused by sudden zone switching, greatly improving the user experience and the accuracy of the operation. Through the above series of closely coordinated operations, the drive adjustment module realizes efficient, intelligent and adaptive switching of the gesture board area, providing a strong guarantee for the stable operation and durability of the entire system.

[0024] In another preferred embodiment of the present invention, the control module is responsible for establishing an accurate spatial wear probability distribution map, and its construction process contains complex and sophisticated technical logic.

[0025] First, the control module is committed to collecting multi-source data to establish a multi-dimensional wear-related model. It systematically integrates the patient's daily operation time distribution data, which records in detail the patient's use of the gesture board in different time periods, and can reflect the activeness and time pattern of the operation. At the same time, the finger pressure intensity heat map data is collected. The heat map shows in an intuitive form the distribution of the size of the pressure applied by the patient's fingers in various areas of the gesture board during the operation. Areas with greater pressure are often more prone to wear. In addition, historical data on ambient temperature and humidity are also included, because environmental factors have an important impact on the performance of the board material. Excessive humidity or temperature may accelerate material aging, thereby affecting the wear process. Through the deep integration and analysis of these data, the control module successfully built a comprehensive and detailed multi-dimensional wear-related model, laying a solid foundation for subsequent wear prediction and evaluation.

[0026] Next, the control module uses time series analysis to predict the cumulative wear trend of all operating areas. Time series analysis can dig out the law of data changes over time, and predict the future development trend of wear in various regions by analyzing historical wear data. On this basis, combined with the fatigue characteristics of the gesture board surface material, the remaining life of each power generation unit is further accurately calculated. Different materials have different fatigue characteristics. The control module fully considers this factor and uses relevant knowledge and algorithms in the field of materials science to combine the fatigue loss of materials with the wear caused by actual operation, thereby generating a detailed risk level stratification map. The map clearly presents the degree of wear risk in each operating area, providing an intuitive and accurate basis for subsequent path planning.

[0027] Based on the risk level hierarchical map, the control module begins to carefully plan the movement path of the gesture board. During the planning process, the diagonal direction or edge area is given priority as the selection object for the new operation interface. This is because in actual use, the diagonal direction and edge areas are often used less frequently than the central area, and the degree of wear is relatively light. Selecting these areas as the new operation interface can effectively utilize the unworn or low-wear parts of the gesture board and extend the overall service life. When the available area gradually decreases with the increase in usage time, the control module will enable the spiral diffusion strategy. This strategy starts from the wear center and migrates the use area to the periphery in stages according to pre-set rules. This strategy can guide user operations to the remaining low-wear areas in an orderly manner, maximize the use efficiency of the gesture board, and ensure that the system always maintains good performance during long-term use.

[0028] In addition, the control module also pays great attention to user experience. It will continuously record the patient's adaptability to area switching, and judge the patient's adaptability to each area switch by analyzing the patient's operating behavior data, such as operating fluency, number of misoperations, etc. When it is detected that the patient's operating efficiency has decreased, the control module will automatically adjust the path planning weight coefficient. For example, if it is found that the patient frequently makes operating errors under a certain path planning, the control module will reduce the weight of the path planning and increase the weight of other paths that are more suitable for the patient's operation, thereby realizing dynamic optimization of path planning and continuously improving the user experience.

[0029] In another preferred embodiment of the present invention, the system is also equipped with an intelligent self-maintenance module to provide all-round guarantee for the stable operation of the system.

[0030] When the intelligent self-maintenance module detects that the patient has not operated for a long time, it will automatically start a series of maintenance operations. First, the gesture board position reset operation is performed to adjust the position of the gesture board to the starting position of the next operation cycle, which deviates from the historical wear area by at least two power generation unit spacings. The purpose of this is to ensure that when the patient uses it again, the starting operation area is an unworn or low-wear area to avoid aggravating the degree of wear due to continuous operation in the same wear area. At the same time, the wear debris adsorbed on the surface is removed by a micro vibrator. The micro vibrator will generate vibrations of a specific frequency, so that the tiny wear debris adsorbed on the surface of the gesture board will be detached due to the vibration, and then the debris will be cleaned out through a pre-designed collection device to keep the surface of the gesture board clean and prevent the debris from interfering with subsequent operations.

[0031] During the movement of the gesture board, the intelligent self-maintenance module applies a high-voltage pulse electric field. This electric field can charge the particles generated by wear, and the electrostatic adsorption layer pre-installed in the system will capture the charged particles using electrostatic attraction. In this way, the diffusion of wear particles within the system is effectively avoided, preventing them from damaging other components, and further improving the stability and reliability of the system.

[0032] The intelligent self-maintenance module also periodically activates the benchmark test mode of all power generation units. In this mode, by comparing the consistency of the signal output of each power generation unit under standard pressure, the performance status of the power generation unit can be accurately judged. If the signal output of some power generation units is found to deviate from the standard value, it means that these power generation units may have performance degradation or failure. Based on this, the intelligent self-maintenance module will dynamically update the parameter threshold of the wear assessment model so that the model can more accurately reflect the actual wear of the system at present, providing a more reliable basis for subsequent wear detection and control. In addition, the intelligent self-maintenance module will perform a full-stroke homing operation at a fixed time every day. This operation can eliminate the displacement error accumulated due to long-term use and ensure the position accuracy of the gesture board during the movement process. At the same time, during the homing process, the system will automatically lubricate the guide rail structure to reduce the friction between the guide rail and the moving parts, extend the service life of the guide rail, and ensure the smooth operation of the entire system.

[0033] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A multi-device universal gesture input system based on friction nanogenerators, characterized in that: It includes a flexible gesture board body, a wear detection module, a drive adjustment module and a control module, wherein: The flexible gesture board body includes a slidable substrate and a friction nano-power generation unit matrix. Each power generation unit forms a dynamic connection network through flexible wires. The substrate adopts a multi-layer stacking design, including a bottom anti-bending support layer, a middle deformation conduction layer and a top replaceable friction interface layer. The wear detection module collects the electrical signal waveform characteristics of each power generation unit in real time, extracts the charge peak attenuation rate, contact impedance nonlinear change and signal noise spectrum characteristics, and combines the collaborative response differences of adjacent power generation units to build a dynamic wear assessment model for the local area; The drive adjustment module includes a micro linear motor array and a shape memory alloy bracket. When it is detected that the wear level of the target area exceeds a preset threshold, the linear motor array drives the gesture board to translate in multiple directions along the guide rail, and at the same time uses the pre-programmed deformation characteristics of the shape memory alloy bracket to adjust the curvature of the board surface, so that the patient's finger contact area is adaptively switched to a low-wear area; The control module establishes a spatial wear probability distribution map based on the patient's historical operation data and real-time physiological characteristics, generates a gesture board displacement strategy through a dynamic path planning algorithm, and preferentially selects the area with the lowest wear accumulation risk as the new operation interface.

2. The multi-device universal gesture input system based on friction nanogenerator according to claim 1 is characterized in that: The friction nano power generation unit of the flexible gesture board body is divided into a high-frequency contact area and a low-frequency contact area; The surface of the power generation unit in the high-frequency contact area is covered with a self-healing composite material layer, which includes a flowable repair agent encapsulated in microcapsules and a photoresponsive polymer matrix. When triggered by mechanical friction or external light, the repair agent seeps out and fills the micro cracks, and the photoresponsive polymer solidifies and repairs the interface through a cross-linking reaction. The surface of the power generation unit in the low-frequency contact area is etched with radial micro grooves, and the wear is guided to spread to the edge of the power generation unit through directional texture, and a redundant electrode array is pre-set; Each power generation unit is connected by an elastic hinge structure. When stress is applied, a small relative displacement occurs between the power generation units, and a porous energy absorption layer is set at the bottom of the power generation unit.

3. The multi-device universal gesture input system based on friction nanogenerator according to claim 2 is characterized in that: The flexible gesture board body includes a plurality of independently detachable sub-modules. When a sub-module reaches the life limit standard, it can be replaced through a magnetic suction interface.

4. The multi-device universal gesture input system based on friction nanogenerator according to claim 1 is characterized in that: The process of constructing the dynamic wear assessment model of the local area by the wear detection module is as follows: The peak value of the charge of each friction nano-power generation unit in the continuous triggering cycle is normalized, and its decay slope relative to the initial value is calculated. When the decay slope exceeds twice the average value of the adjacent power generation units, it is marked as a potential wear power generation unit; By applying a micro-current to detect the dynamic changes in the contact impedance between the power generation units, if the correlation between the impedance growth rate and the charge decay rate in a certain area exceeds the preset threshold, and the impedance continues to grow for more than the set time, it is determined to be structural wear; Collect the sliding trajectory data of the patient's finger in the target area, extract the trajectory length, curvature and speed distribution characteristics, and when the trajectory repetition rate is higher than the set threshold and the signal recognition error rate rises to the set threshold simultaneously, it is confirmed that the area has entered a high wear state; According to the marking of potential wear power generation units, structural wear and high wear conditions, the wear areas are graded and marked. Only when the signal attenuation, impedance change and trajectory repeatability meet the set conditions at the same time, the drive adjustment module is triggered to perform area switching.

5. The multi-device universal gesture input system based on friction nanogenerator according to claim 1 is characterized in that: The process of adaptively switching the area of ​​the drive adjustment module is as follows: The micro linear motor array drives the gesture board in an asymmetric stepping mode, moving alternately along the X / Y axis direction, and the displacement of each time is dynamically adjusted according to the real-time wear degree to ensure that the natural placement position of the patient's finger always covers the unworn area; During the translation process, the shape memory alloy bracket produces a preset deformation according to the curvature requirements of the target area, so that a micro-convex or concave structure is formed on the surface of the gesture board, guiding the patient's fingers to naturally deviate to the low-wear area; When the translation operation is not enough to cover the available area, the micro-motor drives the gesture board to rotate around the central axis. The rotation angle matches the range of motion of the patient's finger joints, and the contact pressure is redistributed by changing the angle distribution of the board surface. After each switching action, reverse micro-displacement is automatically performed to release internal stress, and the temperature rise and vibration signals of the drive components are monitored, and prompts are given when the temperature rise and vibration signals are abnormal.

6. The multi-device universal gesture input system based on friction nanogenerator according to claim 5 is characterized in that: Before the driving adjustment module drives the gesture board to move horizontally, it generates micro-vibration of a specific frequency through the piezoelectric brake to prompt the patient that a zone switch is about to occur.

7. The multi-device universal gesture input system based on friction nanogenerator according to claim 1 is characterized in that: The process of the control module establishing the spatial wear probability distribution map is as follows: Integrate the patient's daily operation time distribution, finger pressure intensity heat map and environmental temperature and humidity historical data to establish a multi-dimensional wear correlation model; Use time series analysis to predict the cumulative wear trend of all operating areas, calculate the remaining life of each power generation unit based on the fatigue characteristics of the panel material, and generate a risk level stratification map; Plan the movement path of the gesture board according to the risk level layered map, give priority to the diagonal direction or edge area as the new operation interface, and when the available area decreases, enable the spiral diffusion strategy to migrate the use area in stages from the wear center to the periphery; The patient's adaptability to area switching is recorded, and when a decrease in operating efficiency is detected, the path planning weight coefficient is automatically adjusted.

8. The multi-device universal gesture input system based on friction nanogenerator according to claim 1 is characterized in that: Also includes intelligent self-maintenance module: When it is detected that the patient has not operated continuously, the gesture board position is automatically reset, so that the starting position of the next operation cycle deviates from the historical wear area by at least two power generation unit spacings, and the wear debris adsorbed on the surface is removed by a micro vibrator; A high-voltage pulse electric field is applied during the displacement process, so that the particles generated by wear are charged and captured by the preset electrostatic adsorption layer; The benchmark test mode of all power generation units is activated regularly, and the parameter threshold of the wear assessment model is dynamically updated by comparing the consistency of the signal output of each power generation unit under standard pressure. The full-stroke homing operation is performed at a fixed time every day to eliminate the accumulated displacement error and lubricate the guide structure.

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