Detection device, refrigerator and detection method

Abstract

The invention provides a detection device, a refrigerator and a detection method, the detection device is used for detecting the rotation angle of a rotating member relative to a mounting base, one of the rotating member and the mounting base is provided with a rotating hole, and the other one is provided with a rotating shaft inserted in the rotating hole; the detection device comprises a capacitance sensor, the capacitance sensor comprises a first polar plate and a second polar plate, one of the first polar plate and the second polar plate is installed on the rotating shaft, and the other one is installed in the rotating hole; when the rotating angle of the rotating piece relative to the mounting base is changed, the relative position relation between the first polar plate and the second polar plate is changed; the oscillator is connected with the capacitance sensor; and the controller is connected with the oscillator so as to determine the rotation angle of the rotating part according to the oscillation signal generated by the oscillator. Through the technical scheme provided by the invention, the problem that the opening condition of the box door cannot be accurately detected in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a detection device, a refrigerator and a detection method. Background Art

[0002] At present, refrigerators in the prior art are generally electrical appliances that are powered on 24 hours a day, and their power consumption cannot be underestimated. The power consumption of refrigerator doors is different when they are open and closed. Generally, when the door is open, the corresponding power consumption will increase significantly.

[0003] However, the prior art lacks technical means for accurately detecting the opening of the door. When the door is opened, the corresponding power consumption increases but cannot be accurately monitored, which leads to an increase in power consumption. Summary of the invention

[0004] The main purpose of the present invention is to provide a detection device, a refrigerator and a detection method to solve the problem in the prior art that the opening status of the refrigerator door cannot be accurately detected.

[0005] In order to achieve the above object, according to one aspect of the present invention, a detection device is provided, which is used to detect the rotation angle of the rotating member relative to the mounting base, wherein one of the rotating member and the mounting base is provided with a rotation hole, and the other is provided with a rotating shaft for being inserted into the rotation hole; the detection device comprises:

[0006] A capacitive sensor, the capacitive sensor comprises a first electrode plate and a second electrode plate, one of the first electrode plate and the second electrode plate is mounted on the rotating shaft, and the other is mounted in the rotating hole; when the rotation angle of the rotating member relative to the mounting base changes, the relative position relationship between the first electrode plate and the second electrode plate changes;

[0007] an oscillator, connected to the capacitive sensor;

[0008] The controller is connected to the oscillator to determine the rotation angle of the rotating member according to the oscillation signal generated by the oscillator.

[0009] Furthermore, the detection device also includes:

[0010] The controller is connected to the oscillator through the signal processing module. The signal processing module converts the oscillation amplitude and frequency of the oscillator into analog quantity and switch quantity and transmits them to the controller.

[0011] Furthermore, the signal processing module includes:

[0012] A filter is connected to the oscillator to filter the output signal of the oscillator;

[0013] The analog signal processor, the filter and the controller are all connected to the analog signal processor. The analog signal processor is used to process the signal filtered by the filter and transmit the processed signal to the controller.

[0014] Further, the first electrode plate is an arc-shaped electrode plate; and / or,

[0015] The second electrode plate is an arc-shaped electrode plate.

[0016] Further, the first electrode plate is an arc electrode plate, and the second electrode plate is an arc electrode plate;

[0017] Wherein, the first electrode plate and the second electrode plate are arranged concentrically; and / or,

[0018] The central angle corresponding to the first electrode plate is equal to the central angle corresponding to the second electrode plate.

[0019] Furthermore, the detection device also includes:

[0020] The display is connected to the controller, and is used to display the rotation angle determined by the controller.

[0021] Further, the display is arranged on the rotating member, and the display is located on a side of the rotating member away from the mounting opening of the mounting base.

[0022] According to another aspect of the present invention, there is provided a refrigerator, comprising:

[0023] A door body and a box body, wherein the door body is rotatably arranged relative to the box body, the door body forms a rotating member, and the box body forms an installation base;

[0024] The detection device provided above.

[0025] Further, there are at least two door bodies and at least two detection devices, at least two door bodies are arranged on the installation base at intervals, at least two door bodies are arranged in a one-to-one correspondence with at least two detection devices, and each detection device is used to detect the rotation angle of the corresponding door body; and / or,

[0026] The detection device is arranged on the top of the door body.

[0027] According to another aspect of the present invention, a detection method is provided, which is applicable to the detection device provided above, and the detection method comprises:

[0028] Acquire an oscillation signal of an oscillator of the detection device, and acquire an oscillation frequency and an oscillation amplitude according to the oscillation signal of the oscillator;

[0029] Calculating the relative coverage area between the first electrode plate and the second electrode plate of the capacitive sensor of the detection device according to the oscillation frequency and the amplitude;

[0030] The rotation angle of the rotating member relative to the mounting base is calculated according to the relative coverage area of ​​the first electrode plate and the second electrode plate.

[0031] By applying the technical solution of the present invention, the controller can reversely calculate the change of capacitance according to the oscillation signal of the oscillator, and then obtain the change of the relative coverage area between the first electrode plate and the second electrode plate, and further calculate the rotation angle of the rotating member through the change of the relative coverage area between the first electrode plate and the second electrode plate. Since the oscillator can sensitively oscillate according to the change of the capacitance of the capacitive sensor, the accuracy of the detection of the rotation angle of the rotating member can be effectively guaranteed. The above structure is compact and has high detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 A schematic diagram showing the relative positions of a first electrode plate and a second electrode plate provided according to an embodiment of the present invention is shown;

[0034] Figure 2 A schematic diagram of installing a detection device provided in an embodiment of the present invention is shown;

[0035] Figure 3 A schematic diagram of a detection device provided according to an embodiment of the present invention is shown;

[0036] Figure 4 A schematic structural diagram of a refrigerator provided according to an embodiment of the present invention is shown.

[0037] The above drawings include the following reference numerals:

[0038] 10. Capacitive sensor; 11. First electrode plate; 12. Second electrode plate;

[0039] 20. Oscillator;

[0040] 30. Controller;

[0041] 40. Door body;

[0042] 50. Box body. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] like Figures 1 to 3As shown, a detection device is provided in the first embodiment of the present invention, and the detection device is used to detect the rotation angle of the rotating member relative to the mounting base. A rotation hole is provided on one of the rotating member and the mounting base, and a rotating shaft for being inserted into the rotation hole is provided on the other. The detection device includes: a capacitive sensor 10, an oscillator 20 and a controller 30. The capacitive sensor 10 includes a first electrode plate 11 and a second electrode plate 12. One of the first electrode plate 11 and the second electrode plate 12 is installed on the rotating shaft, and the other is installed in the rotating hole. When the rotation angle of the rotating member relative to the mounting base changes, the relative position relationship between the first electrode plate 11 and the second electrode plate 12 changes. The oscillator 20 is connected to the capacitive sensor 10; the controller 30 is connected to the oscillator 20 to determine the rotation angle of the rotating member according to the oscillation signal generated by the oscillator 20.

[0045] By using the detection device provided in this embodiment, when the rotating member rotates relative to the mounting base, the relative position relationship between the first plate 11 and the second plate 12 changes, so that the relative coverage area between the first plate 11 and the second plate 12 changes, thereby causing the capacitance of the capacitive sensor 10 to change, and then the oscillation signal of the oscillator 20 changes. The controller 30 can reversely calculate the change of the capacitance according to the oscillation signal of the oscillator 20, and then the change of the relative coverage area between the first plate 11 and the second plate 12 can be obtained. The rotation angle of the rotating member can be further calculated by the change of the relative coverage area of ​​the first plate 11 and the second plate 12. Since the oscillator 20 can sensitively perform corresponding oscillations according to the change of the capacitance of the capacitive sensor 10, the accuracy of the detection of the rotation angle of the rotating member can be effectively guaranteed. Therefore, the detection device provided in this embodiment can solve the problem that the opening of the box door cannot be accurately detected in the prior art.

[0046] In this embodiment, the detection device further includes a signal processing module, through which the controller 30 is connected to the oscillator 20, and the signal processing module converts the oscillation amplitude and frequency of the oscillator 20 into analog quantity and switch quantity and transmits the analog quantity and switch quantity to the controller 30. With such a setting, it is convenient for the controller 30 to perform calculations according to the signal processed by the signal processing module, so as to calculate the rotation angle of the rotating member.

[0047] Specifically, the signal processing module includes: a filter and an analog signal processor, the filter is connected to the oscillator 20 to filter the output signal of the oscillator 20 to avoid interference from irrelevant signals. The filter and the controller 30 are both connected to the analog signal processor, and the analog signal processor is used to process the signal filtered by the filter and transmit the processed signal to the controller 30 so that the controller 30 can process the processed signal.

[0048] Specifically, the first pole plate 11 is an arc-shaped pole plate so as to adapt to the rotation of the rotating member and avoid interference between the first pole plate 11 and the second pole plate 12 due to the rotation of the rotating member.

[0049] The second pole plate 12 is an arc-shaped pole plate so as to adapt to the rotation of the rotating member and avoid the mutual interference between the first pole plate 11 and the second pole plate 12 caused by the rotation of the rotating member.

[0050] Specifically, the first electrode plate 11 is an arc electrode plate, and the second electrode plate 12 is an arc electrode plate.

[0051] The first electrode plate 11 and the second electrode plate 12 are arranged concentrically, so that the change of the rotation angle between the first electrode plate 11 and the second electrode plate 12 can be quickly known through the mutual covering area between the first electrode plate 11 and the second electrode plate 12, which is convenient for calculation.

[0052] Specifically, the central angle corresponding to the first electrode plate 11 is equal to the central angle corresponding to the second electrode plate 12. In this way, it is easy to confirm the relative position relationship between the first electrode plate 11 and the second electrode plate 12. Specifically, when the rotation angle of the rotating member relative to the mounting base is zero, that is, the rotating member is blocked at the mounting opening of the mounting base, the first electrode plate 11 and the second electrode plate 12 can be completely arranged opposite to each other; when the rotation angle of the rotating member relative to the mounting base is greater than zero, the first electrode plate 11 and the second electrode plate 12 are partially misaligned.

[0053] In this embodiment, the detection device further includes a display, which is connected to the controller 30, and the display is used to display the rotation angle determined by the controller 30. In this way, the rotation angle of the rotating member can be displayed on the display, so that the user can know the opening or closing state of the refrigerator in time.

[0054] Specifically, the display is arranged on the rotating member, and the display is located at a side of the rotating member away from the mounting opening of the mounting base, so that the user can better observe the rotation angle of the refrigerator door.

[0055] Specifically, the detection device also includes an alarm component, which is connected to the controller 30 and is used to send an alarm signal according to the rotation state of the rotating component. Specifically, when the controller 30 detects that the rotation angle of the rotating component corresponds to the open state for a time greater than or equal to a preset time length, the alarm component sends an alarm signal to prompt the user that the door is in the open state.

[0056] like Figure 4As shown, the second embodiment of the present invention provides a refrigerator, which includes: a door body 40, a box body 50 and the detection device provided in the above embodiment, the door body 40 is rotatably arranged relative to the box body 50, the door body 40 forms a rotating member, and the box body 50 forms an installation base. In this way, the rotation angle of the door body 40 can be easily detected.

[0057] In this embodiment, the characteristic that the electric field on the surface of the electrode of the capacitive sensor 10 changes and causes the coupling capacitance to change is utilized, and the electric field on the surface of the two concentrically arranged metal electrodes of the capacitive sensor 10 is driven to change through the movement of the refrigerator door, causing the coupling capacitance to change, so that the oscillator 20 starts to oscillate, and the oscillation amplitude-frequency is converted into analog quantity and switching quantity and output, finally realizing the angle and switch state detection.

[0058] Specifically, the detection device can be placed in the hinge shaft of the refrigerator body 50 and the door, wherein the device includes a capacitive sensor 10, an oscillator 20 (specifically, a high-frequency oscillator 20), an amplitude signal processing module, etc. The capacitive sensor 10 has two electrode plates, namely, a fixed electrode plate and a moving electrode plate, which are respectively embedded between the fixed axis and the moving axis of the hinge shaft, one of the fixed electrode plate and the moving electrode plate corresponds to the first electrode plate 11, and the other corresponds to the second electrode plate 12. The oscillation processing is that the electric field on the surface of the metal electrode changes, causing the coupling capacitance to change, so that the oscillator 20 starts to oscillate; the amplitude signal processing is that the oscillation amplitude frequency generated by the oscillator 20 is converted into analog quantity and switch quantity and output.

[0059] At this time, when the door moves, it drives the two concentrically arranged metal electrode plates of the moving plate and the fixed plate of the capacitive sensor 10, so that the coverage area between the two metal electrode plates changes, the electric field on the electrode surface changes, and the capacitive coupling changes, and the capacity of the capacitive sensor 10 changes C=C0(1-θ / π), so that the oscillator 20 oscillates, and the amplitude signal is processed to judge and output the analog quantity and the switching quantity; the output data is used to collect the oscillation frequency and oscillation amplitude with the controller 30, so that the coverage area between the metal electrodes of the capacitive sensor 10 can be obtained, and the rotation angle can be obtained according to the calculation, thereby realizing the detection of the angle of the refrigerator door and the door switch state.

[0060] Among them, the angle is θ and the initial value C0 of the capacitance sensor 10. The capacitance of the capacitance sensor 10 can be derived according to the capacitance formula of the capacitor C=VQ (where C represents the capacitance and Q is the amount of charge in the capacitor): C=(εA(1-θ / π)) / d=C0(1-θ / π), C is the current state capacitance of the capacitance sensor 10 (in farads), ε is the dielectric constant, A is the area of ​​the electrode (in square meters), and d is the distance between the electrodes (in meters).

[0061] The controller 30 calculates the current door opening angle and determines the switch state of the refrigerator door, thereby finally realizing the door switch detection output. The capacitive switch has a faster response speed and higher accuracy, achieving precise control and a better experience.

[0062] Specifically, according to the characteristics of capacitors, changing the area of ​​the relative electrode plates of the capacitor will cause the capacitance to change nonlinearly. θ =H (height) × l (arc length)) is controlled by the rotating arc length variable (θπR / 180), and then the oscillator 20 system analyzes the capacity change of the capacitive sensor 10 by oscillating the frequency and amplitude to obtain the analog quantity and the refrigerator control system to obtain the refrigerator door opening angle θ.

[0063] When the overlap area of ​​the capacitor fixed plate and the moving plate decreases, the electrostatic charge decreases, and the capacitance decreases as the area decreases, thereby changing the oscillation frequency and amplitude of the oscillator 20. The capacitance of the variable capacitor depends on the distance between the capacitor plates, the relative area and the dielectric constant of the medium. According to the capacitance formula C = εS / d, the capacitance C is proportional to the area S of the capacitor plates, inversely proportional to the distance d between the plates, and proportional to the dielectric constant ε of the medium.

[0064] In this embodiment, there are at least two door bodies 40, at least two detection devices, at least two door bodies 40 are arranged at intervals on the installation base, at least two door bodies 40 are arranged one-to-one with at least two detection devices, and each detection device is used to detect the rotation angle of the corresponding door body 40. With such an arrangement, it is convenient to detect the rotation angle of each door body 40 separately.

[0065] Specifically, the detection device is arranged at the top of the door body 40, so as to effectively protect the detection device and avoid the situation where the detection device is arranged at a lower position and is easily interfered with by other components or is easily disturbed by the user's use.

[0066] Embodiment 3 of the present invention provides a detection method, which is applicable to the detection device provided above, and the detection method includes: obtaining the oscillation signal of the oscillator 20 of the detection device, and obtaining the oscillation frequency and oscillation amplitude according to the oscillation signal of the oscillator 20; calculating the relative coverage area between the first electrode plate 11 and the second electrode plate 12 of the capacitive sensor 10 of the detection device according to the oscillation frequency and amplitude; calculating the rotation angle of the rotating member relative to the installation base according to the relative staggered coverage area of ​​the first electrode plate 11 and the second electrode plate 12. Using such a detection method, it is convenient to accurately detect the rotation angle of the rotating member relative to the installation base, and it is convenient to quickly provide the user with the switch status of the box door.

[0067] Specifically, the relative coverage area between the first plate 11 and the second plate 12 can be calculated based on the oscillation frequency. When the overlapping area of ​​the first plate 11 and the second plate 12 decreases, the electrostatic charge decreases, and the capacitance decreases as the area decreases, thereby changing the oscillation frequency and amplitude of the oscillator. The capacitance of the variable capacitor depends on the distance between the capacitor plates, the relative area and the dielectric constant of the medium. According to the capacitance formula C=εS / d, the capacitance C is proportional to the capacitor plate area S (which can be understood as the relative staggered coverage area between the first plate 11 and the second plate 12), inversely proportional to the distance d between the plates, and proportional to the dielectric constant ε of the medium.

[0068] The capacitance sensor 10 forms a part of the RC oscillation or LC oscillation of the oscillator 20 during the detection and acquisition process. The working principle of the oscillator is to charge the capacitor with a known current, and the corresponding relationship is i=C*dv / dt, where the capacitance is equal to the current divided by the rate of change of the voltage across the capacitor. The frequency of the oscillator can be calculated by measuring the threshold voltage of the capacitor (relaxation oscillator). When the current is constant, the capacitance changes and decreases as the capacitance threshold voltage (amplitude) increases, and the capacitance changes and decreases as the capacitance charging time (frequency is equal to the inverse of time) increases.

[0069] Specifically, the voltage amplitude V0 determines the maximum voltage of the capacitor during charging and discharging. The current amplitude i depends on the rate of voltage change, that is, dV / dt. The basic formula C=(εA(1-θ / π)) / d=C0(1-θ / π) and the capacitive sensor in the detection and acquisition process constitute a part of the oscillator RC oscillation or LC oscillation. The working principle of the oscillator is to charge the capacitor with a known current, and the corresponding relationship is i=C*dv / dt to determine the relationship between frequency and angle.

[0070] From the above description, it can be seen that the above-mentioned embodiment of the present invention achieves the following technical effects: according to the different states of the refrigerator door, the corresponding coupling generates different oscillation amplitudes. By utilizing the characteristics that the surface electric field of the electrode of the capacitive sensor changes and causes the coupling capacitance to change, the surface electric field of the two concentrically arranged metal electrodes (corresponding to the first plate and the second plate) of the capacitive sensor is driven to change through the action of the door, causing the coupling capacitance to change, so that the oscillator starts to oscillate, and the oscillation amplitude-frequency conversion analog quantity and switch quantity are output, finally realizing the angle and switch state detection, and quickly prompting the user of the door usage status.

[0071] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0072] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0073] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0074] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0075] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A detection device, characterized in that: The detection device is used to detect the rotation angle of the rotating member relative to the mounting base, one of the rotating member and the mounting base is provided with a rotation hole, and the other is provided with a rotating shaft for being inserted into the rotation hole; the detection device comprises: A capacitive sensor (10), the capacitive sensor (10) comprising a first electrode plate (11) and a second electrode plate (12), one of the first electrode plate (11) and the second electrode plate (12) being mounted on the rotating shaft and the other being mounted in the rotating hole; when the rotation angle of the rotating member relative to the mounting base changes, the relative positional relationship between the first electrode plate (11) and the second electrode plate (12) changes; an oscillator (20), connected to the capacitive sensor (10); A controller (30) is connected to the oscillator (20) to determine the rotation angle of the rotating member according to the oscillation signal generated by the oscillator (20).

2. The detection device according to claim 1, characterized in that: The detection device also includes: A signal processing module, wherein the controller (30) is connected to the oscillator (20) via the signal processing module, and the signal processing module converts the oscillation amplitude and frequency of the oscillator (20) into analog quantities and switch quantities and transmits the converted quantities to the controller (30).

3. The detection device according to claim 2, characterized in that: The signal processing module comprises: A filter connected to the oscillator (20) to filter an output signal of the oscillator (20); An analog signal processor, the filter and the controller (30) are both connected to the analog signal processor, and the analog signal processor is used to process the signal filtered by the filter and transmit the processed signal to the controller (30).

4. The detection device according to claim 1, characterized in that: The first electrode plate (11) is an arc-shaped electrode plate; and / or, The second pole plate (12) is an arc-shaped pole plate.

5. The detection device according to claim 1, characterized in that: The first electrode plate (11) is a circular arc electrode plate, and the second electrode plate (12) is a circular arc electrode plate; Wherein, the first electrode plate (11) and the second electrode plate (12) are arranged concentrically; and / or, The central angle of the circle corresponding to the first electrode plate (11) is equal to the central angle of the circle corresponding to the second electrode plate (12).

6. The detection device according to claim 1, characterized in that: The detection device also includes: A display is connected to the controller (30), and is used to display the rotation angle determined by the controller (30).

7. The detection device according to claim 6, characterized in that: The display is arranged on the rotating member, and the display is located at a side of the rotating member away from the mounting opening of the mounting base.

8. A refrigerator, characterized in that: include: A door body (40) and a box body (50), wherein the door body (40) is rotatably arranged relative to the box body (50), the door body (40) forms a rotating member, and the box body (50) forms a mounting base; The detection device according to any one of claims 1 to 7.

9. The refrigerator according to claim 8, characterized in that: There are at least two door bodies (40), there are at least two detection devices, at least two door bodies (40) are arranged at intervals on the installation base, at least two door bodies (40) are arranged in a one-to-one correspondence with at least two detection devices, and each detection device is used to detect the rotation angle of the corresponding door body (40); and / or, The detection device is arranged on the top of the door body (40).

10. A detection method, characterized in that: The detection device according to any one of claims 1 to 7, wherein the detection method comprises: Acquire an oscillation signal of an oscillator of the detection device, and acquire an oscillation frequency and an oscillation amplitude according to the oscillation signal of the oscillator; Calculating the relative coverage area between the first electrode plate and the second electrode plate of the capacitive sensor of the detection device according to the oscillation frequency and amplitude; The rotation angle of the rotating member relative to the mounting base is calculated according to the relative coverage areas of the first electrode plate and the second electrode plate.

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