CN109274364B - Pressing detection method and device for magnetic control knob and storage medium - Google Patents
Pressing detection method and device for magnetic control knob and storage medium Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/965—Switches controlled by moving an element forming part of the switch
- H03K17/97—Switches controlled by moving an element forming part of the switch using a magnetic movable element
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/90—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of galvano-magnetic devices, e.g. Hall-effect devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/965—Switches controlled by moving an element forming part of the switch
- H03K17/97—Switches controlled by moving an element forming part of the switch using a magnetic movable element
- H03K2017/9706—Inductive element
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/94057—Rotary switches
- H03K2217/94068—Rotary switches with magnetic detection
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/965—Switches controlled by moving an element forming part of the switch
- H03K2217/9651—Switches controlled by moving an element forming part of the switch the moving element acting on a force, e.g. pressure sensitive element
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- Geophysics And Detection Of Objects (AREA)
- Push-Button Switches (AREA)
Abstract
The invention relates to the technical field of household appliance control, and discloses a pressing detection method, a detection device and a storage medium for a magnetic control knob. Therefore, the pressing state of the magnetic control knob can be accurately detected, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of household appliance control, in particular to a pressing detection method and a pressing detection device for a magnetic control knob and a storage medium.
Background
The magnetic control knob can be separated from the operation panel, so that the operation panel is convenient to clean, and the magnetic control knob is more and more widely applied to household appliances, particularly household appliances such as kitchen range products which are easy to produce oil stains on the panel and need to be cleaned frequently. Except that accessible rotation operation household electrical appliances, the present magnetic force knob has still increased the function that can press down, has further richened panel function operation, need increase to set up an elasticity structure that resets to pressing in the magnetic force knob to this knob can automatic re-setting after pressing to remove. Meanwhile, the detection algorithm is low in robustness, and the situations of undetected detection or false detection exist at present in the aspect of press detection, so that the user experience is influenced.
Disclosure of Invention
The invention aims to provide a press detection method, a press detection device and a storage medium for a magnetic control knob, and aims to solve the problem of inaccurate detection caused by unreliable press detection algorithm of the existing magnetic control knob.
In order to achieve the above object, the present invention provides a press detection method for a magnetic control knob, the magnetic control knob includes an upper cover and a lower cover that are engaged with each other, the upper cover can be pressed to move toward the lower cover, an inductive trigger component and an elastic reset component for press reset are disposed in a cavity of the upper cover, the press detection method includes:
generating a sensing signal in response to the pressing of the upper cover, wherein the signal value of the sensing signal is associated with the displacement generated by the pressing of the upper cover;
acquiring the change quantity of the signal value within a preset time interval;
and determining that the magnetic control knob is pressed down under the condition that the variation is larger than a preset threshold value.
Optionally, the preset time interval is in a range of 50ms to 200 ms.
Optionally, the method further comprises:
acquiring a first signal value of an induction signal generated when a magnetic control knob is in a pressed state;
acquiring a second signal value of an induction signal generated when the magnetic control knob is in a loosened state;
the preset threshold is calibrated according to the first signal value and the second signal value.
Optionally, calibrating the preset threshold value according to the first signal value and the second signal value comprises:
calculating a difference between the first signal value and the second signal value;
and determining the preset threshold value as the product of the difference value and a coefficient, wherein the value range of the coefficient is 0.5-0.9.
In order to achieve the above object, the present invention further provides a press detection device for a magnetic control knob assembly, the magnetic control knob assembly including an upper cover and a lower cover that are fastened to each other, the upper cover being capable of being pressed to be moved toward the lower cover, an inductive trigger part and an elastic reset member for reset by pressing being disposed in a cavity of the upper cover, the press detection device including:
the detection module responds to the fact that the upper cover is pressed and is triggered by the sensing triggering part to generate a sensing analog signal;
a processor coupled to the detection module, the processor configured to:
converting the induction analog signal into an induction digital signal, wherein the signal value of the induction digital signal is related to the displacement generated by the pressing of the upper cover;
acquiring the change quantity of the signal value within a preset time interval;
and determining that the magnetic control knob is pressed down under the condition that the variation is larger than a preset threshold value.
Optionally, the inductive trigger component is an electrical conductor.
Optionally, the inductive trigger component is a permanent magnet.
Optionally, the processor is further configured to:
acquiring a first signal value of an induction signal generated when the magnetic control knob is in a pressed state;
acquiring a second signal value of an induction signal generated when the magnetic control knob is in a loosened state;
and determining a preset threshold value according to the first signal value and the second signal value.
Optionally, the calibrating the preset threshold value according to the first signal value and the second signal value comprises:
calculating a difference between the first signal value and the second signal value;
and determining the preset threshold as the product of the difference and a coefficient, wherein the value range of the coefficient is 0.5-0.9.
Optionally, the elastic resetting piece is a silica gel pad.
Optionally, the elastic restoring member is an elastic metal gasket.
In order to achieve the above object, the present invention also provides a storage medium having computer readable instructions stored thereon, which when executed by a processor, cause the processor to execute the above-mentioned press detection method for a magnet control knob.
Through the technical scheme, the pressing detection method for the magnetic control knob can accurately detect the pressing state of the magnetic control knob, and improves user experience.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a front view of a magnet control knob used in a press detection method of the magnet control knob according to the present invention;
FIG. 2 is a schematic structural diagram of a magnetic control knob and a detection component in the pressing detection method for the magnetic control knob according to the present invention;
FIG. 3 is an exploded view of the structure of FIG. 1;
FIG. 4 is a bottom view of the metal sheet of FIG. 1 stacked on the bottom surface of a sheet of carrier sheet;
FIG. 5 is a top view of the annular silicone pad of FIG. 1;
FIG. 6 is an overall cross-sectional view of FIG. 5;
FIG. 7 is a flow chart of a first embodiment of a press detection method for a magnetically controlled knob;
FIG. 8 is a schematic diagram of an LC resonant circuit within the detection component of FIG. 2;
fig. 9 is a characteristic curve diagram of pressing force and pressing stroke when the elastic reset piece of the magnetic control knob in fig. 1 is made of a silicon material;
fig. 10 is a characteristic graph of pressing stroke versus time when the elastic reset member of the magnetic control knob in fig. 1 is made of a silicone material;
FIG. 11 is a flow chart of a second embodiment of a press detection method for a magnetically controlled knob;
fig. 12 is a functional block diagram of a press detection device for a magnet knob according to the present invention.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
A first embodiment of the present invention provides a pressing detection method for a magnetic control knob, as shown in fig. 1, the magnetic control knob 100 includes an upper cover 1 and a lower cover 2 that are fastened to each other, the upper cover 1 can be pressed to press and move toward the lower cover 2, an inductive trigger component and an elastic reset component for press reset are disposed in a cavity of the upper cover 1, and when the magnetic control knob 100 is used in cooperation with the magnetic control knob 100, as shown in fig. 2 to 4, the magnetic control knob 100 and the detection component 200 are respectively mounted on two sides of an operation panel 300 of a household appliance, and the magnetic control knob 100 can be separated from the operation panel 300, so as to conveniently clean the operation panel 300. When the magnetic control knob 100 is mounted on the upper surface of the operation panel 300, the magnetic control knob 100 can be rotated or pressed, if the household appliance is a gas stove, the fire power of the gas stove can be adjusted by rotating, and other function settings can be selected by pressing, if the gas stove further comprises a timing function, the fire power adjustment function and the timing function can be switched by pressing. The detecting component 200 is used for detecting a trigger signal generated when the magnetic control knob 100 is rotated or pressed, and converting the trigger signal into a recognizable digital signal after analysis and calculation, such as a rotation angle or a displacement value when pressed.
The above-mentioned scheme of the magnetic control knob 100 and the detection part 200 may be based on the magnetic field intensity detection principle, at this time, the induction triggering part is a permanent magnet installed inside the magnetic control knob 100, a plurality of permanent magnets may be uniformly distributed inside the magnetic control knob 100 along the circumferential inner wall of the knob, at this time, the detection part 200 is a plurality of hall element circuits arranged at positions corresponding to the plurality of permanent magnets, when the magnetic control knob 100 rotates, the hall elements can detect the change of the relative positions of the permanent magnets, the magnetic field intensity of the permanent magnets relative to the hall elements changes, so the reverse rotation angle can be calculated by the signal intensity detected by the hall elements; on the other hand, when the magnet control knob 100 is pressed, the magnetic field generated by the permanent magnet also changes in the vertical direction with respect to the hall element, and the closer to the hall element, the higher the magnetic field intensity, and therefore, the hall element can also detect a displacement signal indicating the pressing.
The above-mentioned scheme of the magnetic control knob 100 and the detection component 200 may also be an inductance-to-digital converter based on the inductance variation brought by the electromagnetic field variation, in which the induction triggering component is an electric conductor installed inside the magnetic control knob 100, such as a piece of copper foil arranged on a PCB, and the detection component 200 is a detection circuit formed by LC resonance, and the principle of the detection circuit is that a magnetic field can be generated by the LC resonance circuit, an eddy current can be induced in the electric conductor, and the eddy current induces a magnetic field in a direction opposite to that of the original LC resonance circuit, and the magnetic field affects the magnetic flux of the exciting coil passing through the inductance of the original LC resonance circuit, and further affects the mutual inductance coefficient of the inductance, so that the resonance frequency of the LC resonance circuit varies, when the distance between the electric conductor and the exciting coil is different, the mutual inductance coefficient of the inductance varies accordingly, and the distance between the electric conductor and the exciting coil is indirectly detected based on the difference of the detected magnitude of the resonance frequency, the distance is a displacement parameter of the magnetic control knob 100 relative to the detection component 200. The displacement parameter can be detected with relatively high accuracy by the means for detecting a displacement 200, and therefore the solution of the present embodiment is preferable to the solution for which the pressing detection method referred to below is proposed.
In the specific structure of the magnetic control knob 100 and the detection component 200 shown in fig. 2 to 6, the electrical conductor of the magnetic control knob 100 is specifically the electrical conductor 3 shown in the drawing, and is located in the knob cavity X of the magnetic control knob 100, the bearing sheet 4 which is connected with the upper cover 1 and horizontally arranged is arranged in the knob cavity X of the magnetic control knob 100, the electrical conductor 3 is a metal sheet and is stacked on the surface of the sheet material of the bearing sheet 4, wherein the electrical conductor 3 should be made of a material which is easy to conduct current, such as a metal sheet like a copper sheet, an aluminum sheet, etc., and certainly can also be made of other materials which are easy to conduct current, which is not illustrated herein.
Specifically, the parts disposed between the conductor 3 and the current-carrying lead (e.g., the bottom wall of the lower cover 2, the housing 300 between the conductor 3 and the current-carrying lead, etc.) should be made of a non-conductive material such as plastic, glass, or ceramic. It will be appreciated that when the parts disposed between the conductor 3 and the current conducting wire are made of a material which is easy to conduct a magnetic field, the magnetic field generated by eddy current in the conductor 3 when the conductor 3 moves towards the lower cover 2 is easy to pass through the material to affect the mutual inductance of the inductor, so that the LC resonant circuit is easy to detect the change of the movement displacement by the change of the resonant frequency. Preferably, the distance between the bottom end of the conductive body 3 and the top end of the excitation coil should be not more than 10 mm.
In addition, magnetic control knob 100 sets firmly the inside support piece 5 in knob inner chamber X including the top that is located carrier 4 and level, is equipped with the elasticity that is used for pressing the reset between the top surface of inside support piece 5 and the bottom surface of upper cover 1 and resets, and like this, the user presses upper cover 1 of magnetic control knob 100 for elasticity resets and produces deformation and energy storage, and after the user removed external force, elasticity resets and releases elastic energy, orders about upper cover 1 and can automatic re-setting under the resilience force effect that elasticity resets.
Wherein, the elastic reset piece can be an annular silica gel pad 6 which is respectively abutted with the top surface of the internal support piece 5 and the bottom surface of the upper cover 1. The bottom surface of the annular silica gel pad 6 is provided with a plurality of elastic reset grooves 61 which are sunken upwards at intervals along the circumferential direction, so that a user can have better pressing hand feeling when pressing the upper cover 1, and the use experience of the user is improved; and adopt annular silica gel pad 6 as the elasticity piece that resets can also effectively prevent to appear blocking, card when the user from pressing and die and can not press the situation that targets in place, be favorable to improving the reliability of magnetic control knob 100. Preferably, the elastic reset groove 61 is in a truncated cone shape, and the bottom surface of the groove is formed with an abutting bearing platform protruding towards the internal support, so that when a user presses in place, the user can be given a better pressing feedback hand feeling, and better use experience can be brought to the user.
Alternatively, the elastic restoring member may be an elastic metal gasket which abuts against the top surface of the inner support member 5 and the bottom surface of the upper cover 1, respectively. The elastic metal gasket is provided with an arc-shaped pressing surface, the pressing surface is sunken downwards when a user presses, and when the user presses and removes the pressing surface, the pressing surface automatically rebounds to the original position by virtue of the resilience force of the arc-shaped pressing surface. Preferably, the resilient metal gasket may be a dome member as known in the art.
In this embodiment, the elastic restoring member is preferably an annular silicone rubber pad 6.
Preferably, the bottom surface of the upper cover 1 is provided with a plurality of connecting columns 7 which are arranged at intervals along the circumferential direction, and the bottom ends of the connecting columns 7 penetrate downwards from the upper part of the internal supporting piece 5 and are connected with the buckling positions of the bearing sheets 4; inside support piece 5's bottom surface is stretched out along circumference interval and is had many butt posts 51, and the top surface butt post 51's of carrier sheet 4 bottom surface, like this, can be spacing to carrier sheet 4 for in-process such as magnetic control knob 100 is removing in transportation or user, can prevent effectively that carrier sheet 4 from removing round trip in knob inner chamber X, not only can influence user's use and experience.
Preferably, the detecting member 200 further includes a fixed positioning magnet 202 fixedly disposed, and the exciting coil includes a plurality of solenoids 201 wound by multiple energized wires, and the plurality of solenoids 201 are arranged around the fixed positioning magnet 202. In addition, a knob positioning magnet 8 fitted to the fixed positioning magnet 202 is provided in the center of the top surface of the lower cover 2. With such an arrangement, the magnetic control knob 100 can not only be removed from the outer surface of the housing 300, but also be conveniently and quickly placed on a corresponding position by a user, so as to facilitate the quick positioning of the magnetic control knob 100, due to the magnetic attraction positioning effect between the fixed positioning magnet 202 and the knob positioning magnet 8.
As shown in fig. 7, the pressing detection method based on the structures of the magnetic control knob 100 and the detection member 200 includes:
step S710, responding to the pressing of the upper cover 1 to generate a sensing signal, wherein the signal value of the sensing signal is related to the displacement generated by the pressing of the upper cover 1;
step S720, acquiring the change quantity of the signal value within a preset time interval;
and step S730, determining that the magnetic control knob 100 is pressed down when the variation is larger than the preset threshold.
The above-described pressing detection method may be implemented based on the execution body of the detection part 200.
In step S710, when the LC resonant circuit in the detection component 200 operates, the inductance of the LC resonant circuit responds to the magnetic field generated by the eddy current in the electrical conductor in the magnetic control knob 100, so as to change the mutual inductance of the inductance, and further change the resonant frequency of the LC resonant circuit, and further convert the resonant frequency to obtain an induced signal value, wherein the magnitude of the induced signal value is related to the displacement generated by pressing the upper cover 1. When the upper cover 1 is pressed, the closer the relative displacement of the detection member 200 is, the larger the value of the sensing signal is, and conversely, the smaller the value of the sensing signal is.
Specifically, the operation principle of the LC resonant circuit is shown in fig. 8, in which the LC resonant circuit 210 is disposed in the detection component 200, the LC resonant circuit 210 mainly includes a processor 203, a capacitor C, and an inductor L, where the inductor L is the spiral tube 201 forming the excitation coil mentioned in fig. 2 to 3, two ends of the inductor L are connected to the processor 203 after being connected in parallel with the capacitor C, and two ends of the inductor L are connected to the processor 203, and other processing branches such as an amplifier, an impedance circuit, etc. may be disposed from the processor 203 to the oscillation circuit. The capacitor C and the inductor L further form a resonant unit, the processor 203 supplies current to the resonant unit, the LC resonant unit generates a magnetic field on the inductor L during oscillation, the magnetic flux penetrates through the conductor 3 disposed on the carrier sheet 4, so that an eddy current is generated in the conductor 3, and the eddy current induces a magnetic field opposite to the magnetic field on the inductor L, thereby affecting the magnetic flux generated by the inductor L, and thus affecting the mutual inductance of the inductor. In the LC resonant circuit 210, the resonant unit composed of the inductor L and the capacitor C detects the corresponding oscillation analog signal in the resonant state, the analog signal has a specific oscillation frequency, i.e. the resonant frequency, and the processor 203 recognizes the analog signal and converts the analog signal into the corresponding resonant frequency value, and further converts the resonant frequency value into the signal value of the digital signal corresponding to the displacement D generated when the upper cover 1 is pressed. The difference in resonant frequency f corresponds to the difference in displacement D between the conductor 3 and the inductance L, i.e., the solenoid 201.
In steps S720 and S730, for the sampled preset time interval Δ T, the above-mentioned sensing signal values may be obtained at the starting time point and the ending time point of the preset time interval Δ T, respectively, and the variation of the signal value is obtained, and compared with a preset threshold, if the variation is greater than the preset threshold, it is determined that the magnetic control knob 100 is pressed.
Specifically, when the elastic restoring member is made of silicone material, that is, as shown in fig. 5 to 6, the characteristics of the pressing force N and the pressing stroke H of the silicone key formed by the silicone rubber pad 6 are as shown in fig. 9, in the process that the user presses the upper cover 1 of the magnetic control knob 100 with a finger, the pressing stroke H increases with the increase of the pressing force at the beginning, but when the pressing force reaches a value H1 and corresponds to a peak value N1, the pressing force decreases when the pressing stroke H increases further, that is, the stroke change with the same length can be realized without the large pressing force, and the change trend continues until the pressing stroke is H2, which corresponds to a pressing force of a valley value N2, and the trend is the same before the value H1. According to the pressing characteristics of the human fingers, the pressing force is basically constant or gradually increased during pressing, so that the pressing stroke can be rapidly increased along with time in the variation trend of the pressing stroke H and the pressing force N corresponding to H1-H2, and the intuitive experience is the pressing process with the 'paragraph feeling'. Therefore, in the pressing process, the characteristic of the pressing stroke H along with the time T is as shown in fig. 10, in the drawing, when the pressing is started, the pressing stroke changes slowly from 0 to T1, the pressing stroke is slowly increased in the vicinity of the value of H1, and along with the increase of the pressing force, when the pressing force reaches the corresponding peak value N1 in fig. 9, the pressing force required by the same pressing stroke at this time is rapidly reduced, because the pressing force applied by the human finger also maintains the inertia basically unchanged, the stroke is rapidly increased along with the time until the pressing stroke reaches H2, the relation between the pressing stroke and the pressing force at this time is restored to the state before the previous value of H1, and the slow increasing trend along with the time is maintained until the maximum stroke of the silicone key is reached, namely, the pressing is completed. Therefore, during the pressing process of the silicone key, two distinct phase values H1 and H2 appear as shown in fig. 10, corresponding to the sensing signal values a1 and a2, respectively. The variation of the two signal values is maintained substantially constant for each pressing of the fixed silicone key, and thus whether the key is pressed can be determined based on the variation.
Specifically, the variation of the signal value of the magnetic control knob 100 during pressing is collected within a preset time, and compared with a preset threshold TH related to the variation of a1 and a2, if the preset threshold TH is exceeded, it can be determined that the magnetic control knob 100 is pressed.
Due to inertia of human pressing action, when the key is pressed, the time from the initial key contact to the key press is basically determined, namely the pressing action time generated by the human has a fixed range value, so that the preset time for acquiring the change quantity of the signal value also has a corresponding range value, if the preset time is too long, the whole pressing time of the key press is exceeded, and the time is beyond the time point of missing the highest and lowest strokes of the pressing, especially when the key press is frequently pressed, the time spans the two pressing processes; the preset time is too short, which results in that the time point of the lowest stroke of the press cannot be sampled. The two states can cause inaccuracy of the variation of the collected signal value, so that the pressed state cannot be accurately detected. According to the experimental determination, the preset time is 50-200ms, more preferably 80-150ms, for example, 100 ms.
The elastic reset element in the magnetic control knob may also be made of a material other than a silicone material, for example, an elastic metal gasket used in a touch key, i.e., a snap dome structure, may also have the pressing characteristic curves shown in fig. 9 and 10, and thus the pressing detection method of the present embodiment may also be applied.
According to the press detection method for the magnetic control knob, the magnetic control knob is internally provided with the induction triggering component and the elastic resetting piece for press resetting, the press state of the magnetic control knob is detected through the detection component matched with the magnetic control knob, specifically, the upper cover is pressed to generate an induction signal, the signal value of the induction signal is related to the displacement generated by pressing the upper cover, then the change quantity of the signal value in the preset time interval is acquired, and the magnetic control knob is determined to be pressed down under the condition that the change quantity is larger than the preset threshold value. Therefore, the pressing state of the magnetic control knob can be accurately detected, and the user experience is improved.
Further, based on the first embodiment of the method for detecting press of the magnetic control knob according to the present invention, in the second embodiment of the method for detecting press of the magnetic control knob according to the present invention, the method further includes calibrating the preset threshold, as shown in fig. 11, the calibrating specifically includes:
step S810, acquiring a first signal value of an induction signal generated when the magnetic control knob is in a pressed state;
step S820, acquiring a second signal value of the induction signal generated when the magnetic control knob is in a loosened state;
step S830, calibrating the preset threshold according to the first signal value and the second signal value.
When the variation of a1 and a2 determines the preset threshold TH, the preset threshold TH preferably needs to be calibrated in advance by the variation. Namely, the signal value a1 of the pressing state and the signal value a2 of the released state of the magnetic control knob 100 are respectively obtained through the above steps S810 to S830, wherein the pressing state refers to the state that the magnetic control knob 100 is in the maximum stroke when being pressed to the bottom. Then a coefficient X is introduced, and the variation of the signal is multiplied by the coefficient X to finally obtain a preset threshold TH, that is, TH ═ X (a1-a2), since a1 represents the signal value corresponding to the stroke before the silicone key is pressed, that is, in the released state, and a2 represents the signal value corresponding to the stroke when the silicone key is pressed to the bottom state, the variation a1-a2 represents the variation of the corresponding signal value represented by the maximum stroke when the silicone key is pressed, therefore, when the variation of the signal value required to be sampled is compared with the preset threshold, the variation of the signal value corresponding to the stroke variation obtained in the pressing process does not exceed the value a1-a2, and the preset threshold should be smaller than the value a1-a2, so that the pressed state can be accurately detected, generally, the range of the value X is 0.5-0.9, further preferably 0.6-0.8 by experiments, such as a value of 0.7.
Through the calibration of the preset threshold TH in the above steps, the accurate preset threshold TH corresponding to the pressing characteristic of the magnetic control knob 100 is obtained, so that the pressing detection precision of the magnetic control knob 100 is further improved.
The embodiment of the present invention further provides a press detection device 400 for a magnetic control knob, wherein the specific structure of the magnetic control knob and a detection component used in cooperation with the magnetic control knob is the same as the structure of the corresponding component in the above embodiment of the press detection method for a magnetic control knob, that is, the magnetic control knob 100 includes an upper cover 1 and a lower cover 2 which are fastened to each other, the upper cover 1 can be pressed to press and move toward the lower cover 2, an induction triggering component and an elastic resetting component for press resetting are disposed in a cavity of the upper cover 1, when the magnetic control knob 100 is used in cooperation with the magnetic control knob, as shown in fig. 2 to 4, the device further includes a detection component 200, the magnetic control knob 100 and the detection component 200 are respectively mounted on two sides of an operation panel 300 of a household appliance, and the magnetic control knob 100 can be separated from the operation panel 300.
The above-mentioned scheme of the magnetic control knob 100 and the detection component 200 may be based on the magnetic field strength detection principle, at this time, the induction triggering component is a permanent magnet installed inside the magnetic control knob 100, a plurality of permanent magnets may be uniformly distributed inside the magnetic control knob 100 along the circumferential wall of the knob, at this time, the detection component 200 is a plurality of hall element circuits disposed at positions corresponding to the plurality of permanent magnets, when the magnetic control knob 100 is pressed, the magnetic field generated by the permanent magnet also changes in the up-down direction relative to the hall element, the closer to the hall element, the higher the magnetic field strength is, and therefore, the hall element may also detect the displacement signal indicating the pressing.
In the above-mentioned embodiment of the magnetic control knob 100 and the detection component 200, the sensing triggering component is an electric conductor installed inside the magnetic control knob 100, such as a piece of copper foil arranged on a PCB, and the detection component 200 is a detection circuit formed by LC resonance. The principle is that a magnetic field can be generated through the LC resonance circuit, eddy current can be induced in the electric conductor, the eddy current induces a magnetic field with the direction opposite to that of the original LC resonance circuit, the magnetic field influences the magnetic flux of the excitation coil of the inductor passing through the original LC resonance circuit, and further influences the mutual inductance coefficient of the inductor, so that the resonance frequency of the LC resonance circuit is changed, when the distance between the electric conductor and the excitation coil is different, the mutual inductance coefficient of the inductor is different, the distance between the electric conductor and the excitation coil is indirectly detected based on the difference of the detected resonance frequency, and the distance is the displacement parameter of the magnetic control knob 100 relative to the detection part 200. The displacement parameter can be detected with relatively high accuracy by the means for detecting a displacement 200, and therefore the solution of the present embodiment is preferable to the solution for which the pressing detection device referred to below is proposed.
In the specific structure of the magnetic control knob 100 and the detection component 200 shown in fig. 2 to 6, the electrical conductor of the magnetic control knob 100 is specifically the electrical conductor 3 shown in the figure, and is located in the knob cavity X of the magnetic control knob 100, the bearing sheet 4 which is connected with the upper cover 1 and horizontally arranged is arranged in the knob cavity X of the magnetic control knob 100, the electrical conductor 3 is a metal sheet and is stacked on the surface of the sheet material of the bearing sheet 4, wherein the electrical conductor 3 should be made of a material which is easy to conduct current. The parts arranged between the conductor 3 and the current-carrying conductor should be made of non-conductive material such as plastic, glass or ceramic.
In addition, magnetic control knob 100 sets firmly the inside support piece 5 in knob inner chamber X including the top that is located carrier 4 and level, be equipped with between the top surface of inside support piece 5 and the bottom surface of upper cover 1 and be used for pressing the elasticity piece that resets, thus, the user presses the upper cover 1 of magnetic control knob 100, make elasticity reset produce and warp and the energy storage, after the user removes external force, elasticity resets and releases the elastic energy, order about upper cover 1 and can automatic re-setting under the resilience force effect that elasticity resets.
Wherein, the elastic reset piece can be an annular silica gel pad 6 which is respectively abutted with the top surface of the internal support piece 5 and the bottom surface of the upper cover 1. The bottom surface of the annular silica gel pad 6 is provided with a plurality of elastic reset grooves 61 which are sunken upwards at intervals along the circumferential direction, so that a user can have better pressing hand feeling when pressing the upper cover 1, and the use experience of the user is improved; and adopt annular silica gel pad 6 as the elasticity piece that resets can also effectively prevent that the user from blocking, card from dying and can not press the situation that targets in place when pressing, be favorable to improving the reliability of magnetic control knob 100.
Alternatively, the elastic restoring member may be an elastic metal gasket which abuts against the top surface of the inner support member 5 and the bottom surface of the upper cover 1, respectively. The elastic metal gasket is provided with an arc-shaped pressing surface, the pressing surface is sunken downwards when a user presses, and when the user presses and removes the elastic metal gasket, the pressing surface automatically rebounds to the original position by virtue of resilience force of the arc-shaped pressing surface. Such as the resilient metal gasket, may be a snap-in piece component as is known in the art.
Preferably, the bottom surface of the upper cover 1 is provided with a plurality of connecting columns 7 which are arranged at intervals along the circumferential direction, and the bottom ends of the connecting columns 7 penetrate downwards from the upper part of the internal supporting piece 5 and are connected with the buckling positions of the bearing sheets 4; the bottom surface of the internal support 5 extends with a plurality of abutting columns 51 along the circumferential direction at intervals, and the top surface of the bearing piece 4 abuts against the bottom surface of the abutting columns 51, so that the bearing piece 4 can be limited.
Preferably, the detecting member 200 further includes a fixed positioning magnet 202 fixedly disposed, and the exciting coil includes a plurality of solenoids 201 wound by multiple energized wires, and the plurality of solenoids 201 are arranged around the fixed positioning magnet 202. In addition, the center of the top surface of the lower cover 2 is provided with a knob positioning magnet 8 which is matched with the fixed positioning magnet 202.
The pressing detection device 400 is provided in the detection member 200, and as shown in fig. 12, the pressing detection device 400 includes:
the detection module 420 is used for generating a sensing analog signal by being triggered by the sensing triggering part in response to the upper cover being pressed;
a processor 410 coupled to the detection module 420, the processor 410 configured to:
converting the induction analog signal into an induction digital signal, wherein the signal value of the induction digital signal is related to the displacement generated by the pressing of the upper cover 1;
acquiring the change quantity of the signal value within a preset time interval;
and determining that the magnetic control knob is pressed down under the condition that the variation is larger than a preset threshold value.
Specifically, the detecting module 420 may be a resonant unit composed of an inductor L and a capacitor C in the LC resonant circuit 210 in the embodiment of the pressing detection method for the magnetic control knob, and the processor 410 corresponds to the processor 203 in the LC resonant circuit 210, and it should be noted that the processor 410 may be a single processor, or may be a unit circuit composed of a single processor and other detecting or analyzing circuits. In this case, the induction trigger unit is a conductor that generates an eddy current.
The detection module is a conductive body in this embodiment.
When the LC resonant circuit in the detection component 200 works, the inductance thereof responds to the magnetic field generated by the eddy current in the electrical conductor in the magnetic control knob 100, so as to change the mutual inductance coefficient of the inductance, thereby changing the resonant frequency of the LC resonant circuit, and further converting the resonant frequency to obtain an induction signal value, wherein the magnitude of the induction signal value is related to the displacement generated by pressing the upper cover 1. When the upper cover 1 is pressed, the closer the relative displacement of the detection member 200 is, the larger the value of the sensing signal is, and conversely, the smaller the value of the sensing signal is.
Specifically, the operation principle of the LC resonant circuit is shown in fig. 8, in the figure, the LC resonant circuit 210 is disposed in the detection component 200, the LC resonant circuit 210 mainly includes a processor 203, a capacitor C, and an inductor L, where the inductor L is the solenoid 201 forming the excitation coil mentioned in fig. 2 to 3, two ends of the inductor L are connected to the processor 203 after being connected in parallel with the capacitor C, and other processing branches such as an amplifier, an impedance circuit, etc. may be disposed from the processor 203 to the oscillation circuit. The inductor comprises a capacitor C, an inductor L, a processor 203, a resonance unit, a magnetic field, an eddy current, a magnetic flux, a mutual inductance coefficient and a self-inductance quantity, wherein the capacitor C and the inductor L further form the resonance unit, the processor 203 supplies current for the operation of the resonance unit, the LC resonance unit generates a magnetic field on the inductor L when oscillating, the magnetic flux penetrates through the conductor 3 arranged on the bearing sheet 4, so that the eddy current is generated inside the conductor 3, and induces a magnetic field which is opposite to the magnetic field on the inductor L, so that the magnetic flux generated by the inductor L is influenced, and the mutual inductance coefficient of the inductor is influenced. In the LC resonant circuit 210, the resonant unit composed of the inductor L and the capacitor C detects the corresponding oscillation analog signal in the resonant state, the analog signal has a specific oscillation frequency, i.e. the resonant frequency, and the processor 203 recognizes the analog signal and converts the analog signal into the corresponding resonant frequency value, and further converts the resonant frequency value into the signal value of the digital signal corresponding to the displacement D generated when the upper cover 1 is pressed. The difference in resonant frequency f corresponds to the difference in displacement D between the conductor 3 and the inductance L, i.e., the solenoid 201.
For the preset sampling time interval Δ T, the above-mentioned sensing signal values may be obtained at the start time point and the end time point of the preset time interval Δ T, respectively, and the variation of the signal value is obtained, and compared with a preset threshold, if the variation is greater than the preset threshold, it is determined that the magnetic control knob 100 is pressed down.
Specifically, when the elastic restoring member is made of silicone material, that is, as shown in fig. 5 to 6, the characteristics of the pressing force N and the pressing stroke H of the silicone key formed by the silicone rubber pad 6 are as shown in fig. 9, in the process that the user presses the upper cover 1 of the magnetic control knob 100 with a finger, the pressing stroke H increases with the increase of the pressing force at the beginning, but when the pressing force reaches a peak value H1 and corresponds to a peak value N1, the pressing force decreases when the pressing stroke H increases further, that is, the stroke change with the same length can be realized without the large pressing force, and the change trend continues until the pressing stroke is H2, which corresponds to a valley value N2, and then the change trend is the same before the value H1. According to the pressing characteristics of the human fingers, the pressing force is basically constant or gradually increased during pressing, so that the pressing stroke can be rapidly increased along with time in the variation trend of the pressing stroke H and the pressing force N corresponding to H1-H2, and the intuitive experience is the pressing process with the 'paragraph feeling'. Therefore, in the pressing process, the characteristic of the pressing stroke H along with the time T is as shown in fig. 10, in the figure, when the pressing is started, the pressing stroke changes slowly from 0 to T1 time, and gradually rises around the H1 value, and as the pressing force increases, when the pressing force reaches the corresponding peak value N1 in fig. 9, the pressing force required by the same pressing stroke at this time is rapidly reduced, because the pressing force applied by the human finger also keeps the inertia basically unchanged, so that the stroke increases rapidly along with the time until the pressing stroke reaches H2, the relation between the pressing stroke and the pressing force at this time is restored to the state before the previous H1 value, and therefore, the slow increasing trend along with the time is maintained until the maximum stroke of the silicone key is reached, namely, the state of pressing to the bottom is reached. Therefore, during the pressing process of the silicone key, two distinct phase values H1 and H2 appear as shown in fig. 10, corresponding to the sensing signal values a1 and a2, respectively. The variation of the two signal values is maintained substantially constant for each pressing of the fixed silicone key, and thus whether the key is pressed or not can be determined based on the variation.
Specifically, the variation of the signal value of the magnetic control knob 100 during pressing is collected within a preset time, and compared with a preset threshold TH related to the variation of a1 and a2, if the preset threshold TH is exceeded, it can be determined that the magnetic control knob 100 is pressed.
Due to inertia of human pressing action, when the key is pressed, the time from the initial key contact to the key press is basically determined, namely the pressing action time generated by the human has a fixed range value, so that the preset time for acquiring the change quantity of the signal value also has a corresponding range value, if the preset time is too long, the whole pressing time of the key press is exceeded, and the time is beyond the time point of missing the highest and lowest strokes of the pressing, especially when the key press is frequently pressed, the time spans the two pressing processes; the preset time is too short, which results in that the time point of the lowest stroke of the press cannot be sampled. The two states can cause inaccuracy of the variation of the collected signal value, so that the pressed state cannot be accurately detected. According to the experimental determination, the preset time is 50-200ms, more preferably 80-150ms, for example, 100 ms.
According to the press detection device for the magnetic control knob, the magnetic control knob is internally provided with the sensing trigger component and the elastic reset piece for press reset, the press state of the magnetic control knob is detected through the detection component matched with the magnetic control knob, specifically, the sensing signal is generated in response to the press of the upper cover, the signal value of the sensing signal is related to the displacement generated by the press of the upper cover, then the change quantity of the signal value in the preset time interval is acquired, and the pressing of the magnetic control knob is determined under the condition that the change quantity is larger than the preset threshold value. Therefore, the pressing state of the magnetic control knob can be accurately detected, and the user experience is improved.
Further, the processor 410 is further configured to calibrate the preset threshold value prior to determining that the magnetically controlled knob 100 is pressed:
acquiring a first signal value of an induction signal generated when the magnetic control knob 100 is in a pressed state;
acquiring a second signal value of an induction signal generated when the magnetic control knob 100 is in a loosened state;
and determining a preset threshold value according to the first signal value and the second signal value.
When the variation of a1 and a2 determines the preset threshold TH, the preset threshold TH preferably needs to be calibrated in advance by the variation. Namely, the signal value a1 of the pressing state and the signal value a2 of the released state of the magnetic control knob 100 are respectively obtained through the above steps S810 to S830, wherein the pressing state refers to the state that the magnetic control knob 100 is in the maximum stroke when being pressed to the bottom. Then a coefficient X is introduced, and the variation of the signal is multiplied by the coefficient X to finally obtain a preset threshold TH, that is, TH ═ X (a1-a2), since a1 represents the signal value corresponding to the stroke before the silicone key is pressed, that is, in the released state, and a2 represents the signal value corresponding to the stroke when the silicone key is pressed to the bottom state, the variation a1-a2 represents the variation of the corresponding signal value represented by the maximum stroke when the silicone key is pressed, therefore, when the variation of the signal value required to be sampled is compared with the preset threshold, the variation of the signal value corresponding to the stroke variation obtained in the pressing process does not exceed the value a1-a2, and the preset threshold should be smaller than the value a1-a2, so that the pressed state can be accurately detected, generally, the range of the value X is 0.5-0.9, further preferably 0.6-0.8 by experiments, such as a value of 0.7.
Through the calibration of the preset threshold TH in the above steps, the accurate preset threshold TH corresponding to the pressing characteristic of the magnetic control knob 100 is obtained, so that the pressing detection precision of the magnetic control knob 100 is further improved.
Embodiments of the present invention also provide a computer program product comprising program instructions that, when executed by a controller, enable the controller to implement any of the press detection methods for a magnetically controlled knob in the above embodiments.
Embodiments of the present invention also provide a storage medium having computer-readable instructions stored thereon, which, when executed by a controller, enable the controller to perform the press detection method for a magnet control knob in the above-described embodiments.
Those skilled in the art can understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program to instruct related hardware, where the program is stored in a storage medium and includes several instructions to enable a (may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description herein, references to the description of the terms "first embodiment," "second embodiment," "example," etc., mean that a particular method, apparatus, or feature described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, methods, apparatuses, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A pressing detection method for a magnetic control knob is characterized in that the magnetic control knob comprises an upper cover and a lower cover which are mutually buckled, the upper cover can be pressed to move towards the lower cover in a pressing mode, an induction trigger component and an elastic reset piece for pressing reset are arranged in a cavity of the upper cover, and the pressing detection method comprises the following steps:
generating an induction signal in response to the pressing of the upper cover based on a magnetic field intensity detection principle, wherein a signal value of the induction signal is related to the displacement generated by the pressing of the upper cover;
acquiring the change quantity of the signal value within a preset time interval;
determining that the magnetic control knob is pressed down under the condition that the variation is larger than a preset threshold value;
acquiring a first signal value of an induction signal generated when the magnetic control knob is in a pressed state;
acquiring a second signal value of an induction signal generated when the magnetic control knob is in a loosened state;
calibrating the preset threshold value according to the first signal value and the second signal value.
2. The press detection method according to claim 1, wherein the preset time interval is in a range of 50ms to 200 ms.
3. The press detection method of claim 1, wherein said calibrating the preset threshold value according to the first signal value and the second signal value comprises:
calculating a difference between the first signal value and the second signal value;
and determining the preset threshold value as the product of the difference value and a coefficient, wherein the value range of the coefficient is 0.5-0.9.
4. The utility model provides a press detection device for magnetic control knob, the magnetic control knob includes upper cover and lower cover of mutual lock, the upper cover can be pressed towards the lower cover is pressed and is removed, set up response trigger part in the cavity of upper cover and be used for pressing the elasticity piece that resets, press detection device and include:
the detection module responds to the fact that the upper cover is pressed and is triggered by the induction trigger component to generate an induction analog signal based on a magnetic field intensity detection principle;
a processor coupled to the detection module, the processor configured to:
converting the induction analog signal into an induction digital signal, wherein the signal value of the induction digital signal is related to the displacement generated by the pressing of the upper cover;
acquiring the variation of the signal value within a preset time interval;
determining that the magnetic control knob is pressed down under the condition that the variation is larger than a preset threshold value;
acquiring a first signal value of an induction signal generated when the magnetic control knob is in a pressed state;
acquiring a second signal value of an induction signal generated when the magnetic control knob is in a loosened state;
calibrating the preset threshold value according to the first signal value and the second signal value.
5. The compression detection device of claim 4, wherein the inductive trigger member is an electrical conductor.
6. The compression detection apparatus of claim 4, wherein the inductive trigger member is a permanent magnet.
7. The press detection device of claim 4, wherein the calibrating the preset threshold value as a function of the first signal value and the second signal value comprises:
calculating a difference between the first signal value and the second signal value;
and determining the preset threshold value as the product of the difference value and a coefficient, wherein the value range of the coefficient is 0.5-0.9.
8. The press detection device of claim 4, wherein the elastic return member is a silicone pad.
9. The compression detection device of claim 4, wherein the resilient return member is a resilient metal gasket.
10. A storage medium having computer readable instructions stored thereon, wherein the computer readable instructions, when executed by a processor, cause the processor to perform the press detection method for a magnetically controlled knob according to any one of claims 1-3.
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