Method and device for detecting rotation of knob and kitchen range

Abstract

The invention discloses a rotation detection method and device of a rotary knob and a kitchen range, the rotary knob is used for being connected with a panel of the kitchen range, the rotary knob comprises a rotating unit and a fixing unit, and the rotating unit comprises an ejector rod part used for forming a first electric contact point with the panel and an inner shell part used for forming a second electric contact point with the panel; the rotation detection method comprises the following steps: generating a reference position according to a first electric contact point; respectively generating a first position and a second position according to the change of the second electric contact point; and calculating the current rotation state of the knob according to the reference position, the first position and the second position. According to the scheme, the touch screen can be used for detection, and the knob and the touch screen do not need to be connected through a wire. Wherein a first electric contact point of the ejector rod part and the touch screen can be used as a reference position, a second electric contact point of the inner shell part and the touch screen can be used as a detection point, so that the current rotation state of the knob is calculated together with the reference position, and the detection mode is simple and is convenient to be combined with the touch screen for use.

Description

Technical Field

[0001] The invention relates to a knob for a cooker and the cooker. Background Art

[0002] With the development of technology, a large number of touch screens are used in kitchen appliances. Kitchen appliances are becoming more and more intelligent and convenient to use. Consumers are also accustomed to the convenience brought by intelligent technology. As a control element, the knob can realize both the switch function and the adjustment function. For example, in a stove, the knob is used to turn the stove on and off, and also to adjust the firepower.

[0003] In the prior art, many kitchen appliances use a combination of a touch screen and a knob, and a traditional knob is difficult to use in combination with a touch screen. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above defects in the prior art and to provide a method, device and cooker for detecting the rotation of a knob.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A method for detecting rotation of a knob, wherein the knob is used to be connected to a panel of a cooker, the knob comprises a rotating unit and a fixing unit, the fixing unit is used to be connected to the panel of the cooker, the rotating unit is connected to the fixing unit in a rotatable manner relative to the fixing unit; the rotating unit comprises a top rod portion for forming a first electrical contact point with the panel, and an inner shell portion for forming a second electrical contact point with the panel;

[0007] The rotation detection method comprises:

[0008] generating a reference position according to the first electrical contact point;

[0009] generating a first position and a second position respectively according to a change of the second electrical contact point;

[0010] The current rotation state of the knob is calculated based on the reference position, the first position, and the second position.

[0011] In this solution, the knob can contact the touch screen through the top rod part and the inner shell part respectively, so as to use the touch screen for detection, and there is no need to connect the knob to the touch screen through a wire. The first electrical contact point between the top rod part and the touch screen can be used as a reference position, and the second electrical contact point between the inner shell part and the touch screen can be a detection point, so as to calculate the current rotation state of the knob together with the reference position. This detection method is simple and convenient for use in combination with the touch screen.

[0012] Preferably, generating a reference position according to the first electrical contact point comprises:

[0013] generating origin coordinates according to the first electrical contact point, and using the origin coordinates as the reference position;

[0014] Generating a first position and a second position respectively according to a change of the second electrical contact point, including:

[0015] generating a front coordinate according to the front position of the second electrical contact point, and using the front coordinate as the first position;

[0016] Current coordinates are generated according to the current position of the second electrical contact point, and the current coordinates are used as the second position.

[0017] In this scheme, the origin coordinates corresponding to the first electrical contact point are used as the reference position, and the previous coordinates and current coordinates corresponding to the second electrical contact point before and after the change are used as the first position and the second position. Thus, the current rotation state of the knob can be obtained based on the origin coordinates, previous coordinates and current coordinates. This calculation method is simple.

[0018] Preferably, generating a previous coordinate according to a previous position of the second electrical contact point, and using the previous coordinate as the first position; generating a current coordinate according to a current position of the second electrical contact point, and using the current coordinate as the second position, comprises:

[0019] Generate a coordinate system corresponding to the knob according to the origin coordinates;

[0020] generating the preceding coordinates according to the preceding position and the coordinate system;

[0021] The current coordinates are generated according to the current position and the coordinate system.

[0022] In this solution, a coordinate system is generated according to the origin coordinates, and the previous position and the current position of the second electrical contact point are used to generate the previous coordinates and the current coordinates in the coordinate system, thereby determining each coordinate point.

[0023] Preferably, calculating the current rotation state of the knob according to the reference position, the first position and the second position comprises:

[0024] Calculate the leading angle according to the leading coordinates and the origin coordinates;

[0025] Calculate the current angle according to the current coordinates and the origin coordinates;

[0026] The rotation direction and rotation angle of the knob are determined according to the difference between the current angle and the previous angle.

[0027] In this solution, based on the origin coordinates, the preceding angle and the current angle can be calculated respectively through the preceding coordinates and the current coordinates, thereby determining the rotation direction and the rotation angle.

[0028] Preferably, generating a coordinate system corresponding to the knob according to the origin coordinates includes:

[0029] Determine the horizontal axis according to the origin coordinates and the position of the second electrical contact point when the knob is in the initial state;

[0030] Determine the vertical axis according to the origin coordinates and the horizontal axis;

[0031] The coordinate system is generated according to the horizontal axis and the vertical axis.

[0032] Preferably, the top rod part is in contact with the panel; the inner shell part is movable relative to the fixed unit and in the direction of the rotation axis of the rotating unit to contact with the panel;

[0033] The rotation detection method further comprises:

[0034] After the knob is mounted on the panel, the reference position is obtained;

[0035] When the inner shell part moves to contact the panel, the first position is acquired, and when the knob is operated again, the second position is acquired.

[0036] In this solution, when the user operates the knob, the user may first press the rotating unit downward, and obtain the first position after the pressing is completed; then, the user may rotate the knob again, and obtain the second position after the rotation is completed.

[0037] Preferably, the inner shell part is located inside the fixing unit, and a spacing space is formed between the inner shell part and the fixing unit; a gear structure is provided in the spacing space, and the gear structure abuts between the inner shell part and the fixing unit along the radial direction of the rotating unit;

[0038] The rotation detection method further comprises:

[0039] When the inner shell part rotates to a certain gear position, the first position or the second position is obtained.

[0040] In this solution, by setting a gear structure, it is possible to avoid the first position and the second position from overlapping during two rotations, thereby avoiding inaccurate judgment.

[0041] Preferably, the panel of the cooker is provided with a touch screen, the knob comprises a housing made of a conductive material, the top rod portion comprises a conductive material for forming a conductive path with the housing and the panel, and the inner housing portion comprises a conductive portion for forming a conductive path with the housing and the panel;

[0042] The rotation detection method further comprises:

[0043] The reference position, the first position and the second position are generated by detecting the change in capacitance between the knob and the panel.

[0044] A rotation detection device for a knob, the rotation detection device is used to execute the above-mentioned knob detection method, and the rotation detection device is arranged in a cooker.

[0045] A cooker comprises the above-mentioned rotation detection device for the knob.

[0046] The positive and progressive effect of the present invention is that the knob can contact the touch screen through the top rod part and the inner shell part respectively, so as to use the touch screen for detection, and there is no need to connect the knob to the touch screen through a wire. The first electrical contact point between the top rod part and the touch screen can be used as a reference position, and the second electrical contact point between the inner shell part and the touch screen can be a detection point, so as to calculate the current rotation state of the knob together with the reference position. The detection method is simple and convenient for use in combination with the touch screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of a knob provided in an embodiment of the present invention when installed on a cooker;

[0048] Figure 2 A perspective exploded schematic diagram of a knob provided by an embodiment of the present invention;

[0049] Figure 3 for Figure 2 An exploded diagram of another perspective of the middle knob;

[0050] Figure 4 A cross-sectional view of a knob provided in an embodiment of the present invention, wherein the cross-sectional view provides a schematic diagram of the structure of the conductive portion;

[0051] Figure 5 A cross-sectional view of a knob provided in an embodiment of the present invention, wherein the cross-sectional view provides a schematic diagram of the structure of the limiting structure;

[0052] Figure 6 A cross-sectional view of a knob provided in an embodiment of the present invention, wherein the cross-sectional view provides a schematic structural diagram of a gear structure;

[0053] Figure 7A flowchart of a method for detecting rotation of a knob is provided for this embodiment of the present invention.

[0054] Description of reference numerals:

[0055] Knob 1, rotating unit 10, outer shell 100, limit buckle 140, top rod part 200, inner shell part 300, conductive part 310, limit groove 410, fixing unit 20, fastener 500, elastic abutment part 610, first elastic part 611, steel ball 612, gear groove 620, spacing space 700, touch screen 2, panel 3, rotation axis R. DETAILED DESCRIPTION

[0056] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0057] This embodiment provides a knob 1 for a cooker, such as Figure 1 As shown, the knob 1 can be installed on a touch screen 2 of a cooker, such as a glass panel 3, and the knob 1 has a metal touch to simulate the user's finger interacting with the touch screen 2. In a specific implementation, the knob 1 can be connected to the panel 3 by a fastener 500 such as a screw, or by an adhesive fastening method.

[0058] like Figure 2 and Figure 3 As shown, the knob 1 includes a rotating unit 10 and a fixed unit 20, the fixed unit 20 is used to be connected to the panel 3 of the cooker, and the rotating unit 10 is connected to the fixed unit 20 in a rotatable manner relative to the fixed unit 20. When the knob 1 is mounted on the panel 3, the fixed unit 20 can be fixed relative to the panel 3, and the rotating unit 10 can be driven by the user to rotate relative to the fixed unit 20, that is, relative to the panel 3. The rotating unit 10 includes an outer shell 100, a top rod part 200 and an inner shell part 300, the top rod part 200 and the inner shell part 300 are both arranged in the outer shell 100 and connected to the outer shell 100, the top rod part 200 is located at the central area of ​​the outer shell 100, and the inner shell part 300 is located at the radial end area of ​​the outer shell 100. The top rod part 200 is used to form a first electrical contact point with the panel 3, and the inner shell part 300 is used to form a second electrical contact point with the panel 3.

[0059] like Figure 1 As shown, the knob 1 is a flat cylindrical structure as a whole. The rotating unit 10 can rotate relatively around the rotation axis, and the rotation axis is the central axis of the rotating unit 10. Figure 2 and Figure 3As shown, the outer shell 100 is a generally cylindrical structure, and the top rod part 200 and the inner shell part 300 are both arranged in the inner space of the outer shell 100. When the outer shell 100 is rotated by the user, the top rod part 200 and the inner shell part 300 can rotate with the outer shell 100. Figure 5 As shown, the fixing unit 20 is also located inside the housing 100 .

[0060] The outer shell 100 is made of a conductive material, and the top rod part 200 has a conductive material for forming a conductive path with the outer shell 100 and the panel 3. A conductive part 310 is provided in the inner shell part 300, one end of the conductive part 310 is in contact with the outer shell 100, and the other end extends to the surface of the inner shell part 300 facing the panel 3, so as to contact the panel 3. Among them, the top rod part 200 can be made of a conductive material, or can also include a conductive material, so that the top rod part 200 can form a conductive path with the outer shell 100, and the position where the top rod part 200 contacts the panel 3 is a first electrical contact point. The other parts of the inner shell part 300 except the conductive part 310 are made of non-conductive materials, so that the inner shell part 300 forms a conductive path with the outer shell 100 at the conductive part 310, and the position where the conductive part 310 contacts the panel 3 is a second electrical contact point.

[0061] The outer shell 100 and the top rod part 200 can be used as part of a conductive path, and the conductive part 310 of the inner shell part 300 and the outer shell 100 can be used as part of another conductive path, so that when the knob 1 is installed on the cooker panel 3, through the user's operation, a conductive path can be formed at the top rod part 200 and the conductive part 310, and the cooker panel 3 can collect signals at the central area and the radial end area of ​​the knob 1 respectively, and the rotation angle of the knob 1 can be obtained according to the signals at these two places. In addition, the knob 1 is installed on the cooker panel 3 through the fixing unit 20, and through the formation of two conductive paths, there is no need to perforate and arrange the wires, so that the convenience of using the knob 1 can be improved.

[0062] This embodiment provides a method for detecting the rotation of a knob 1. Figure 7 As shown, the rotation detection method includes the following steps:

[0063] S100 : generating a reference position according to a first electrical contact point; specifically, forming a first electrical contact point on the top pin part 200 .

[0064] S200: Generate a first position and a second position respectively according to the change of the second electrical contact point; specifically, the contact between the inner shell part 300 and the panel 3 before the rotation is taken as the first position, and the contact between the inner shell part 300 and the panel 3 after the rotation is taken as the second position.

[0065] S300: Calculate the current rotation state of the knob 1 according to the reference position, the first position and the second position.

[0066] The knob 1 can contact the touch screen 2 through the top rod part 200 and the inner shell part 300, so as to use the touch screen 2 for detection, and there is no need to connect the knob 1 with the touch screen 2 through a wire. The first electrical contact point between the top rod part 200 and the touch screen 2 can be used as a reference position, and the second electrical contact point between the inner shell part 300 and the touch screen 2 can be a detection point, so as to calculate the current rotation state of the knob 1 together with the reference position. This detection method is simple and convenient for use in combination with the touch screen 2.

[0067] like Figure 4 As shown, the center point of the contact portion between the top rod 200 and the panel 3 coincides with the rotation axis of the rotating unit 10. When the user rotates the knob 1, the contact portion between the top rod 200 and the panel 3 does not change, while the conductive portion 310 of the inner shell 300 rotates with the user's operation.

[0068] The above step S100 includes the following steps:

[0069] S110: Generate origin coordinates (X0, Y0) according to the first electrical contact point, and use the origin coordinates as a reference position.

[0070] The above step S200 includes the following steps:

[0071] S210: generating a front coordinate (X1, Y1) according to the front position of the second electrical contact point, and using the front coordinate as the first position;

[0072] S220: Generate current coordinates (X2, Y2) according to the current position of the second electrical contact point, and use the current coordinates as the second position.

[0073] The origin coordinate corresponding to the first electrical contact point is used as the reference position, and the previous coordinate and current coordinate corresponding to the second electrical contact point before and after the change are used as the first position and the second position. Thus, the current rotation state of the knob 1 can be obtained according to the origin coordinate, the previous coordinate and the current coordinate. This calculation method is simple.

[0074] As a preferred implementation, the above steps S210 and S220 further include the following steps:

[0075] S201: Generate a coordinate system corresponding to knob 1 according to the origin coordinates;

[0076] S202: Generate a front coordinate according to the front position and the coordinate system;

[0077] S203: Generate current coordinates according to the current position and coordinate system.

[0078] In this embodiment, the previous coordinates and current coordinates can be generated based on a plane rectangular coordinate system, a coordinate system can be generated according to the origin coordinates, and the previous position and current position of the second electrical contact point can be used to generate the previous coordinates and current coordinates in the coordinate system to determine each coordinate point.

[0079] Furthermore, the above step S201 may further include the following steps:

[0080] S2011: Determine the horizontal axis based on the origin coordinates and the position of the second electrical contact point in the initial state of the knob 1. When the knob 1 is placed on the panel 3, the position where the top rod part 200 contacts the touch screen 2 is the origin coordinate, and the position where the conductive part 310 of the inner shell part 300 initially contacts the touch screen 2 is the initial second electrical contact point. The line connecting the origin coordinates and the second electrical contact point can be used as the horizontal axis. If the conductive part 310 is in surface contact with the touch screen 2, the center point of the surface contact area can be used as the second electrical contact point.

[0081] S2012: Determine the longitudinal axis according to the origin coordinates and the transverse axis. Specifically, the longitudinal axis is perpendicular to the transverse axis and passes through the origin coordinates.

[0082] S2013: Generate a coordinate system according to the horizontal axis and the vertical axis. Specifically, the origin coordinates, the horizontal axis and the vertical axis form a plane rectangular coordinate system of the knob 1 on the touch screen 2, and the coordinate system is obtained after the knob 1 is set on the touch screen 2.

[0083] Furthermore, the above step S300 includes the following steps:

[0084] S310: Calculate the leading angle according to the leading coordinates and the origin coordinates;

[0085] S320: Calculate the current angle according to the current coordinates and the origin coordinates;

[0086] S330: Determine the rotation direction and rotation angle of knob 1 according to the difference between the current angle and the previous angle.

[0087] Furthermore, the coordinate difference (△X, △Y) is calculated to determine the direction of rotation of knob 1 (coordinate system with X0, Y0 as the origin) and the angle θ=arctan[(y2-y0) / (x2-x0)]-arctan[(y1-y0) / (x1-x0)], thereby controlling the intake volume controlled by the electric valve.

[0088] As a preferred implementation method, Figure 5As shown, part of the rotating unit 10 is movable relative to the fixed unit 20 in the direction of the rotating axis of the rotating unit 10; there is a gap between the plane where the surface of the inner shell part 300 facing the panel 3 and the plane where the surface of the fixed unit 20 connected to the panel 3 is located in the direction of the rotating axis of the rotating unit 10. When the user operates the knob 1, the rotating unit 10 can be pressed down first and then rotated.

[0089] Furthermore, if Figure 5 As shown, the top rod part 200 is a structure with elastic compression, so that the top rod part 200 can always contact with the panel 3, and after the inner shell part 300 is pressed down, the conductive part 310 contacts with the panel 3. In addition, the top rod part 200 contacts with the panel 3, so that the top rod part 200 can also serve as a support for the rotating unit 10, so that the inner shell part 300 can not contact with the panel 3 when it is not pressed down. In other embodiments, other structures can also be provided to support the rotating unit 10, so that the top rod part 200 and the inner shell part 300 can contact with the panel 3 again after the pressing operation.

[0090] Furthermore, the rotation detection method further includes:

[0091] S410: After the knob 1 is installed on the panel 3, a reference position is obtained;

[0092] S420: When the inner shell part 300 moves to contact the panel 3, the first position is acquired, and after the knob 1 is operated again, the second position is acquired.

[0093] When the user operates the knob 1 , the user may first press the rotating unit 10 downward, and obtain the first position after the pressing is completed; then the user may rotate the knob 10 again, and obtain the second position after the rotation is completed.

[0094] Furthermore, a limiting structure is provided between the housing 100 of the rotating unit 10 and the fixed unit 20, which can limit the rotation of the rotating unit 10 relative to the fixed unit 20, thereby preventing the knob 1 from being triggered by mistake. Moreover, when the housing 100 of the rotating unit 10 moves relative to the fixed unit 20 in the direction of the rotation axis R, the limiting between the housing 100 and the fixed unit 20 can be released, so that the knob 1 can control the cooker accordingly. Figure 5As shown, part of the fixing unit 20 extends into the housing 100, and the outer side wall of the part of the fixing unit 20 extending into the housing 100 is provided with a limiting groove 410, which extends in a direction parallel to the rotation axis R of the rotating unit 10 and penetrates the outer side wall of the fixing unit 20 toward the end of the panel 3; the limiting buckle 140 is arranged on the inner surface of the side wall of the housing 100. The housing 100 accommodates part of the fixing unit 20, so that in the direction along the rotation axis R, the housing 100 and the fixing unit 20 overlap, and the limiting structure is arranged in the overlapping area to avoid the limiting structure from being exposed, so that the knob 1 has a consistent external structure. When the limiting buckle 140 is separated from the limiting groove 410, the limiting buckle 140 can be abutted against the bottom surface of the outer side wall.

[0095] In the above steps S410 and S420, in the current use cycle, for example, when the user uses the cooker, in the initial stage, the knob 1 is pressed down, the inner shell part 300 moves axially and contacts the panel 3, and the first position is obtained; then the knob 1 is rotated to adjust the firepower, and when the knob 1 stops rotating, the second position is obtained. Through the first position and the second position, the angle and direction of the user's rotation during the initial stage can be obtained. In the subsequent stage, the knob 1 is always pressed down, and the inner shell part 300 contacts the touch screen 2; when the user adjusts again, the last second position can be used as the current first position, and the adjusted position can be used as the current second position.

[0096] As a preferred implementation method, Figure 6As shown, the inner shell part 300 is located inside the fixed unit 20, and a spacing space 700 is formed between the inner shell part 300 and the fixed unit 20; a gear structure is arranged in the spacing space 700, and the gear structure abuts between the inner shell part 300 and the fixed unit 20 along the radial direction of the rotating unit 10. The gear structure includes an elastic abutting portion 610 and a gear slot 620, the elastic abutting portion 610 is arranged along the radial direction of the rotating unit 10, and the gear slot 620 is arranged along the circumferential direction of the rotating unit 10. The gear slot 620 is arranged on the fixed unit 20, and the elastic abutting portion 610 is arranged on the rotating unit 10, and can rotate relative to the gear slot 620 on the fixed unit 20 as the rotating unit 10 rotates. The gear slot 620 is a concave-convex structure provided on the inner surface of the fixed unit 20. The concave portion of the gear slot 620 is concave relative to the rotating unit 10 and in the radial direction of the rotating unit 10, and the convex portion of the gear slot 620 is convex relative to the rotating unit 10 and in the radial direction of the rotating unit 10. The elastic abutting portion 610 includes a first elastic member 611 and a steel ball 612. The steel ball 612 is arranged close to the gear slot 620. The first elastic member 611 abuts between the steel ball 612 and the rotating unit 10 to abut the steel ball 612 against the gear slot 620. The steel ball 612 can move on the gear slot 620 of the concave-convex structure. The first elastic member 611 can adapt to the movement change of the concave-convex structure in the radial direction, so that the steel ball 612 can always abut against the gear slot 620.

[0097] Furthermore, the rotation detection method further includes: when the inner shell part 300 rotates to a certain gear, obtaining the first position or the second position. By setting the gear structure, it is possible to avoid the first position and the second position from overlapping during two rotations, thereby avoiding inaccurate judgment.

[0098] As a preferred embodiment, the panel 3 of the cooker is provided with a touch screen 2, the knob 1 comprises a housing 100 made of a conductive material, the top rod portion 200 has a conductive material for forming a conductive path with the housing 100 and the panel 3, and the inner shell portion 300 is provided with a conductive portion 310 for forming a conductive path with the housing 100 and the panel 3;

[0099] Furthermore, the rotation detection method further includes: generating a reference position, a first position and a second position by detecting a change in capacitance between the knob 1 and the panel 3 .

[0100] This embodiment further provides a rotation detection device for the knob 1 , which is used to execute the knob 1 detection method as described above, and is disposed in the cooker.

[0101] In specific implementation, the existing processor of the cooker can be used to carry the rotation detection function.

[0102] This embodiment further provides a cooker, which includes the rotation detection device of the knob 1 as described above.

[0103] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A method for detecting the rotation of a knob, characterized in that: The knob is used to be connected to the panel of the cooker, and the knob includes a rotating unit and a fixing unit. The fixing unit is used to be connected to the panel of the cooker, and the rotating unit is connected to the fixing unit in a rotatable manner relative to the fixing unit; the rotating unit includes a top rod part used to form a first electrical contact point with the panel, and an inner shell part used to form a second electrical contact point with the panel; The rotation detection method comprises: generating a reference position according to the first electrical contact point; generating a first position and a second position respectively according to a change of the second electrical contact point; The current rotation state of the knob is calculated based on the reference position, the first position, and the second position.

2. The method for detecting the rotation of a knob according to claim 1, wherein: Generating a reference position according to the first electrical contact point comprises: generating origin coordinates according to the first electrical contact point, and using the origin coordinates as the reference position; Generating a first position and a second position respectively according to a change of the second electrical contact point, including: generating a front coordinate according to the front position of the second electrical contact point, and using the front coordinate as the first position; Current coordinates are generated according to the current position of the second electrical contact point, and the current coordinates are used as the second position.

3. The method for detecting the rotation of a knob according to claim 2, wherein: generating a front coordinate according to the front position of the second electrical contact point, and using the front coordinate as the first position; Generating current coordinates according to the current position of the second electrical contact point, and using the current coordinates as the second position, includes: Generate a coordinate system corresponding to the knob according to the origin coordinates; generating the preceding coordinates according to the preceding position and the coordinate system; The current coordinates are generated according to the current position and the coordinate system.

4. The method for detecting the rotation of a knob according to claim 3, wherein: Calculating a current rotation state of the knob according to the reference position, the first position, and the second position includes: Calculate the leading angle according to the leading coordinates and the origin coordinates; Calculate the current angle according to the current coordinates and the origin coordinates; The rotation direction and rotation angle of the knob are determined according to the difference between the current angle and the previous angle.

5. The method for detecting the rotation of a knob according to claim 3, wherein: Generating a coordinate system corresponding to the knob according to the origin coordinates, including: Determine the horizontal axis according to the origin coordinates and the position of the second electrical contact point when the knob is in the initial state; Determine the vertical axis according to the origin coordinates and the horizontal axis; The coordinate system is generated according to the horizontal axis and the vertical axis.

6. The method for detecting the rotation of a knob according to any one of claims 1 to 5, characterized in that: The top rod part is in contact with the panel; the inner shell part is movable relative to the fixed unit and in the direction of the rotation axis of the rotating unit to contact with the panel; The rotation detection method further comprises: After the knob is mounted on the panel, the reference position is obtained; When the inner shell part moves to contact the panel, the first position is acquired, and when the knob is operated again, the second position is acquired.

7. The method for detecting the rotation of a knob according to any one of claims 1 to 5, characterized in that: The inner shell part is located inside the fixing unit, and a spacing space is formed between the inner shell part and the fixing unit; a gear structure is arranged in the spacing space, and the gear structure abuts between the inner shell part and the fixing unit along the radial direction of the rotating unit; The rotation detection method further comprises: When the inner shell part rotates to a certain gear position, the first position or the second position is obtained.

8. The method for detecting the rotation of a knob according to claim 1, wherein: The panel of the cooker is provided with a touch screen, the knob comprises a housing made of a conductive material, the top rod portion comprises a conductive material for forming a conductive path with the housing and the panel, and the inner housing portion comprises a conductive portion for forming a conductive path with the housing and the panel; The rotation detection method further comprises: The reference position, the first position and the second position are generated by detecting the change in capacitance between the knob and the panel.

9. A knob rotation detection device, characterized in that: The rotation detection device is used to execute the knob detection method according to any one of claims 1 to 8, and the rotation detection device is arranged in a cooker.

10. A cooking appliance, characterized in that: The cooker comprises the knob rotation detection device according to claim 9.

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