Knob rotation detection method, device and hob

Abstract

The application discloses a rotation detection method and device of a rotary knob and a cooking appliance. The rotary knob is used for being connected with a panel of the cooking appliance. The rotary knob comprises a rotating unit and a fixing unit. The rotating unit comprises a top 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 the first electric contact point; generating a first position and a second position respectively according to changes of the second electric contact point; and calculating a current rotating state of the rotary knob according to the reference position, the first position and the second position. According to the scheme, the rotary knob can be detected by using a touch screen without being connected with the touch screen through a wire. The first electric contact point between the top rod part and the touch screen can be used as the reference position, and the second electric contact point between the inner shell part and the touch screen can be used as a detection point, so that the current rotating state of the rotary knob is calculated together with the reference position. The detection method is simple and convenient to use in combination with the touch screen.

Description

TECHNICAL FIELD

[0001] The present application relates to a knob for a cooking appliance and a cooking appliance. BACKGROUND

[0002] With the development of technology, a large number of touch screens are applied to kitchen electrical equipment. Kitchen electrical products 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 switching function and adjustment function. For example, in a cooking appliance, the knob is used to turn on and off the cooking appliance and also to adjust the fire size.

[0003] Many kitchen electrical products in the prior art use a combination of touch screens and knobs. Traditional knobs are difficult to be used in combination with touch screens. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the above defects in the prior art and provide a rotation detection method and device for a knob and a cooking appliance.

[0005] The present application solves the above technical problems by the following technical solutions:

[0006] A rotation detection method for a knob, the knob being used to connect with a panel of a cooking appliance, the knob comprising a rotating unit and a fixed unit, the fixed unit being used to connect with the panel of the cooking appliance, the rotating unit being connected with the fixed unit in a rotatable manner relative to the fixed unit; the rotating unit comprising 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.

[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 according to changes in the second electrical contact point, respectively;

[0010] calculating a current rotating state of the knob according to the reference position, the first position and the second position.

[0011] In the present application, the knob can contact the touch screen through the top rod part and the inner shell part, so as to be detected by the touch screen without being connected with the touch screen by a wire. The first electrical contact point between the top rod part and the touch screen can be used as the reference position, and the second electrical contact point between the inner shell part and the touch screen can be used as the detection point, so as to calculate the current rotating state of the knob together with the reference position. This detection method is simple and convenient to use in combination with the touch screen.

[0012] Preferably, the reference position is generated according to the first electrical contact point, comprising:

[0013] The origin coordinate is generated according to the first electrical contact point, and the origin coordinate is taken as the reference position;

[0014] The first position and the second position are respectively generated according to the change of the second electrical contact point, comprising:

[0015] The preposition coordinate is generated according to the preposition of the second electrical contact point, and the preposition coordinate is taken as the first position;

[0016] The current coordinate is generated according to the current position of the second electrical contact point, and the current coordinate is taken as the second position.

[0017] In the scheme, the origin coordinate corresponding to the first electrical contact point is taken as the reference position, and the preposition coordinate and the current coordinate corresponding to the preposition and the current position of the second electrical contact point are taken as the first position and the second position, so that the current rotation state of the knob can be obtained according to the origin coordinate, the preposition coordinate and the current coordinate, and the calculation method is simple.

[0018] Preferably, the preposition coordinate is generated according to the preposition of the second electrical contact point, and the preposition coordinate is taken as the first position; the current coordinate is generated according to the current position of the second electrical contact point, and the current coordinate is taken as the second position, comprising:

[0019] The coordinate system corresponding to the knob is generated according to the origin coordinate;

[0020] The preposition coordinate is generated according to the preposition and the coordinate system;

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

[0022] In the scheme, the coordinate system is generated according to the origin coordinate, and the preposition coordinate and the current coordinate are generated according to the preposition and the current position of the second electrical contact point in the coordinate system, so that each coordinate point is determined.

[0023] Preferably, the current rotation state of the knob is calculated according to the reference position, the first position and the second position, comprising:

[0024] The preposition angle is calculated according to the preposition coordinate and the origin coordinate;

[0025] The current angle is calculated according to the current coordinate and the origin coordinate;

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

[0027] In the present solution, based on the origin coordinates, the preposition angle and the current angle can be calculated respectively by the preposition coordinates and the current coordinates, so as to determine the rotation direction and the rotation angle.

[0028] Preferably, according to the origin coordinates, a coordinate system corresponding to the knob is generated, comprising:

[0029] According to the origin coordinates and the position of the second electrical contact point in the initial state of the knob, a horizontal axis is determined;

[0030] According to the origin coordinates and the horizontal axis, a vertical axis is determined;

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

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

[0033] The rotation detection method further comprises:

[0034] When the knob is installed on the panel, the reference position is obtained;

[0035] When the inner shell portion moves to be in contact with the panel, the first position is obtained, and the second position is obtained after the knob is operated again.

[0036] In the present solution, when the user operates the knob, the rotation unit can be pressed down first, and the first position is obtained after the pressing down is completed; then the rotation is performed again, and the second position is obtained after the rotation is completed.

[0037] Preferably, the inner shell portion is located inside the fixed unit, and a spacing space is formed between the inner shell portion and the fixed unit; a gear structure is arranged in the spacing space, and the gear structure abuts between the inner shell portion and the fixed unit along the radial direction of the rotation unit.

[0038] The rotation detection method further comprises:

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

[0040] In the present solution, by arranging the gear structure, the coincidence of the first position and the second position when the rotation is performed twice can be avoided, and thus the inaccurate judgment can be avoided.

[0041] Preferably, the panel of the stove is configured with a touch screen, the knob comprises an outer shell made of conductive material, the top rod part has conductive material for forming a conductive path with the outer shell and the panel, and the inner shell part is internally provided with a conductive part for forming a conductive path with the outer shell 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 capacitance change between the knob and the panel.

[0044] A rotation detection device of a knob is used to perform the rotation detection method as described above, and the rotation detection device is arranged in a stove.

[0045] A stove comprises the rotation detection device of the knob as described above.

[0046] The positive progress effect of the present application is that the knob can be in contact with the touch screen through the top rod part and the inner shell part, so as to be detected by the touch screen, and the knob does not need to be connected with the touch screen through a wire. The first electrical contact point of the top rod part and the touch screen can be used as the reference position, and the second electrical contact point of the inner shell part and the touch screen can be used as the 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 with the touch screen. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 A schematic view of a knob provided by an embodiment of the present application when the knob is installed in a stove;

[0048] Figure 2 A perspective exploded view of a knob provided by an embodiment of the present application;

[0049] Figure 3 A perspective view of a knob provided by an embodiment of the present application; Figure 2 A perspective view of a knob provided by an embodiment of the present application;

[0050] Figure 4 A sectional view of a knob provided by an embodiment of the present application, which provides a structure schematic of the conductive part;

[0051] Figure 5 A sectional view of a knob provided by an embodiment of the present application, which provides a structure schematic of the limiting structure;

[0052] Figure 6 A sectional view of a knob provided by an embodiment of the present application, which provides a structure schematic of the gear structure;

[0053] Figure 7This is a flowchart of a knob rotation detection method provided in this embodiment of the present invention.

[0054] Reference sign list:

[0055] Knob 1, Rotation unit 10, Outer shell 100, Limiting buckle 140, Top rod part 200, Inner shell part 300, Conductive part 310, Limiting groove 410, Fixing unit 20, Fastener 500, Elastic abutment part 610, First elastic element 611, Steel ball 612, Gear groove 620, Interval space 700, Touch screen 2, Panel 3, Rotation axis R. Detailed Implementation

[0056] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0057] This embodiment provides a knob 1 for a stove, such as... Figure 1 As shown, the knob 1 can be installed on the touchscreen 2 of the cooktop, such as on the glass panel 3. The knob 1 has a metal touch to simulate the interaction between the user's finger and the touchscreen 2. In practice, the knob 1 can be connected to the panel 3 by a fastener 500 similar to a screw, or it can be connected to the panel 3 by adhesive fastening.

[0058] like Figure 2 and Figure 3 As shown, the knob 1 includes a rotating unit 10 and a fixing unit 20. The fixing unit 20 is used to connect to the cooktop panel 3, and the rotating unit 10 is rotatably connected to the fixing unit 20 relative to it. When the knob 1 is installed on the panel 3, the fixing 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 fixing unit 20, i.e., relative to the panel 3. The rotating unit 10 includes a housing 100, a top rod portion 200, and an inner housing portion 300. Both the top rod portion 200 and the inner housing portion 300 are located inside the housing 100 and connected to it. The top rod portion 200 is located in the central area of ​​the housing 100, and the inner housing portion 300 is located in the radial end area of ​​the housing 100. The top rod portion 200 is used to form a first electrical contact point with the panel 3, and the inner housing portion 300 is used to form a second electrical contact point with the panel 3.

[0059] like Figure 1 As shown, knob 1 has a flattened cylindrical structure. Rotating unit 10 can rotate relative to it around a rotation axis, which is the central axis of rotating unit 10. Figure 2 and Figure 3As shown, the shell 100 is in a substantially cylindrical structure, the top rod portion 200 and the inner shell portion 300 are both arranged in the internal space of the shell 100, and when the shell 100 is rotated by the user, the top rod portion 200 and the inner shell portion 300 can rotate with the shell 100. As shown, Figure 5 As shown, the fixed unit 20 is also located inside the shell 100.

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

[0061] The shell 100 and the top rod portion 200 can be part of a conductive path, and the conductive part 310 of the inner shell portion 300 and the shell 100 can be part of another conductive path, so that when the knob 1 is installed on the panel 3 of the stove, via the user's operation, a conductive path can be formed at the top rod portion 200 and the conductive part 310, and the panel 3 of the stove can collect signals at the central region and the radial end region of the knob 1 respectively, and the angle of rotation of the knob 1 can be obtained according to the signals at the two places. And the knob 1 is installed on the panel 3 of the stove through the fixed unit 20, and through the formation of the two conductive paths, it is not necessary to arrange wires through holes, so as to improve the convenience of using the knob 1.

[0062] The embodiment provides a rotation detection method of the knob 1, as shown, Figure 7 The rotation detection method comprises the following steps:

[0063] S100: generating a reference position according to the first electrical contact point; specifically, the first electrical contact point is formed at the top rod portion 200.

[0064] S200: generating a first position and a second position according to the change of the second electrical contact point; specifically, the contact of the inner shell portion 300 with the panel 3 before rotation is the first position, and the contact of the inner shell portion 300 with the panel 3 after rotation is the second position.

[0065] S300: calculating 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 touchscreen 2 via the push rod portion 200 and the inner shell portion 300, thereby enabling detection using the touchscreen 2 without the need for connecting the knob 1 to the touchscreen 2 via wires. The first electrical contact point between the push rod portion 200 and the touchscreen 2 can serve as a reference position, and the second electrical contact point between the inner shell portion 300 and the touchscreen 2 can serve as a detection point. Together with the reference position, the current rotation state of the knob 1 can be calculated. This detection method is simple and easy to integrate with the touchscreen 2.

[0067] like Figure 4 As shown, the center point of the contact portion between the top rod portion 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 portion 200 and the panel 3 does not change, while the conductive part 310 of the inner shell portion 300 rotates with the user's operation.

[0068] Step S100 above includes the following steps:

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

[0070] Step S200 above includes the following steps:

[0071] S210: Generate the preceding coordinates (X1, Y1) based on the preceding position of the second electrical contact point, and use the preceding coordinates as the first position;

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

[0073] Using the origin coordinates corresponding to the first electrical contact point as the reference position, and the previous and current coordinates corresponding to the change of the second electrical contact point as the first and second positions, the current rotation state of knob 1 can be obtained based on the origin coordinates, previous coordinates, and current coordinates. This calculation method is simple.

[0074] In a preferred embodiment, steps S210 and S220 further include the following steps:

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

[0076] S202: Generate the previous coordinates based on the previous position and coordinate system;

[0077] S203: Generate the current coordinates based on the current position and coordinate system.

[0078] In the embodiment, the front coordinate and the current coordinate can be generated based on the plane rectangular coordinate system, the coordinate system is generated according to the origin coordinate, and the front coordinate and the current coordinate of the second electric contact point are generated in the coordinate system according to the front position and the current position of the second electric contact point, so as to determine each coordinate point.

[0079] Further, the step S201 can further include the following steps:

[0080] S2011: determining the horizontal axis according to the origin coordinate and the position of the second electric 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 portion 200 contacts the touch screen 2 is the origin coordinate, and the position where the conductive portion 310 of the inner shell portion 300 initially contacts the touch screen 2 is the initial second electric contact point. The line connecting the origin coordinate and the second electric contact point can be the horizontal axis. If the conductive portion 310 is in surface contact with the touch screen 2, the center point of the surface contact region can be taken as the second electric contact point.

[0081] S2012: determining the vertical axis according to the origin coordinate and the horizontal axis. Specifically, the vertical axis is perpendicular to the horizontal axis and passes through the origin coordinate.

[0082] S2013: generating the coordinate system according to the horizontal axis and the vertical axis. Specifically, the origin coordinate, 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 according to the knob 1 being placed on the touch screen 2.

[0083] Further, the step S300 includes the following steps:

[0084] S310: calculating the front angle according to the front coordinate and the origin coordinate;

[0085] S320: calculating the current angle according to the current coordinate and the origin coordinate;

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

[0087] Further, the direction (coordinate system with X0, Y0 as the origin) and the angle θ = arctan[(y2-y0) / (x2-x0)]-arctan[(y1-y0) / (x1-x0)] of the rotation of the knob 1 are determined by calculating the coordinate difference (△X,△Y), so as to control the intake amount of the electric valve.

[0088] As a preferred embodiment, as Figure 5As shown, a portion of the rotating unit 10 is movable relative to the fixed unit 20 in the direction of the rotation axis of the rotating unit 10; the inner shell portion 300 has a gap between the plane of the surface facing the panel 3 and the plane of the surface where the fixed unit 20 connects to the panel 3 in the direction of the rotation 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, such as Figure 5 As shown, the push rod portion 200 has an elastic compression capacity, ensuring that it remains in contact with the panel 3 at all times. After being pressed down, the conductive portion 310 of the inner shell portion 300 contacts the panel 3. Furthermore, the contact between the push rod portion 200 and the panel 3 also allows it to serve as a support for the rotating unit 10, preventing the inner shell portion 300 from contacting the panel 3 when not being pressed down. In other embodiments, other structures can be provided to support the rotating unit 10, allowing the push rod portion 200 and the inner shell portion 300 to contact the panel 3 again after the pressing operation.

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

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

[0092] S420: After the inner shell part 300 moves and contacts the panel 3, it begins to acquire the first position, and acquires the second position after the knob 1 is operated again.

[0093] When the user operates knob 1, they can first press down the rotating unit 10 to obtain the first position; then rotate it to obtain the second position.

[0094] Furthermore, a limiting structure is provided between the outer casing 100 of the rotating unit 10 and the fixed unit 20 to restrict the rotation of the rotating unit 10 relative to the fixed unit 20, preventing accidental triggering of the knob 1. Moreover, when the outer casing 100 of the rotating unit 10 moves relative to the fixed unit 20 in the direction of the rotation axis R, the limiting structure between the outer casing 100 and the fixed unit 20 can be released, thereby enabling the knob 1 to control the stove accordingly. Figure 5As shown, part of the fixing unit 20 extends into the housing 100, the outer side wall of the part of the fixing unit 20 extending into the housing 100 is provided with a limiting groove 410 extending along a direction parallel to the rotation axis R of the rotating unit 10 and penetrating the outer side wall of the fixing unit 20 towards 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 contains part of the fixing unit 20, so that in the direction along the rotation axis R, the housing 100 and the fixing unit 20 have an overlap, the limiting structure is arranged in the overlapping area, avoiding the exposure of the limiting structure, so that the knob 1 has a consistent external structure. When the limiting buckle 140 is disengaged from the limiting groove 410, the limiting buckle 140 can be abutted against the bottom surface of the outer side wall again.

[0095] In the above steps S410 and S420, in the current use cycle, such as when the user uses the stove, 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 fire, and the second position is obtained after the rotation of the knob 1 stops. Through the first position and the second position, the angle and direction of the user's rotation in 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 taken as the current first position, and the adjusted position can be taken as the current second position.

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

[0097] Further, the rotation detection method further includes: obtaining the first position or the second position when the inner shell part 300 rotates to a certain gear. By providing the gear structure, it can be avoided that the first position and the second position coincide when rotating twice, and thus the inaccurate judgment can be avoided.

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

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

[0100] The embodiment also provides a rotation detection device of the knob 1, which is used to execute the knob 1 detection method as described above, and is arranged in the stove.

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

[0102] The present embodiment also provides a cooking appliance, which comprises the rotation detection device of the knob 1 as described above.

[0103] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A rotation detection method of a knob, characterized by, The knob is used to connect with a panel of a cooking appliance, the knob comprises a rotating unit and a fixed unit, the fixed unit is used to connect with the panel of the cooking appliance, and the rotating unit is connected with the fixed unit in a rotatable manner relative to the fixed unit; the rotating unit comprises 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: According to the first electrical contact point, a reference position is generated; According to the change of the second electrical contact point, a first position and a second position are respectively generated; According to the reference position, the first position and the second position, a current rotating state of the knob is calculated; According to the first electrical contact point, a reference position is generated, which comprises: According to the first electrical contact point, an origin coordinate is generated, and the origin coordinate is taken as the reference position; According to the change of the second electrical contact point, a first position and a second position are respectively generated, which comprises: According to the front position of the second electrical contact point, a front coordinate is generated, and the front coordinate is taken as the first position; According to the current position of the second electrical contact point, a current coordinate is generated, and the current coordinate is taken as the second position; According to the front position of the second electrical contact point, a front coordinate is generated, and the front coordinate is taken as the first position; according to the current position of the second electrical contact point, a current coordinate is generated, and the current coordinate is taken as the second position, which comprises: According to the origin coordinate, a coordinate system corresponding to the knob is generated; According to the front position and the coordinate system, the front coordinate is generated; According to the current position and the coordinate system, the current coordinate is generated; According to the reference position, the first position and the second position, a current rotating state of the knob is calculated, which comprises: According to the front coordinate and the origin coordinate, a front angle is calculated; According to the current coordinate and the origin coordinate, a current angle is calculated; According to the difference between the current angle and the front angle, a rotating direction and a rotating angle of the knob are determined.

2. The rotation detection method of a knob according to claim 1, wherein According to the origin coordinate, a coordinate system corresponding to the knob is generated, which comprises: According to the origin coordinate and the position of the second electrical contact point in the initial state of the knob, a horizontal axis is determined; According to the origin coordinate and the horizontal axis, a vertical axis is determined; According to the horizontal axis and the vertical axis, the coordinate system is generated.

3. The rotation detection method of a knob according to any one of claims 1-2, characterized in that, The top rod part contacts with the panel; the inner shell part is movable relative to the fixed unit in the direction of the rotating axis of the rotating unit to contact with the panel; The rotation detection method further comprises: After the knob is installed on the panel, the reference position is obtained; After the inner shell part moves to contact with the panel, the first position is started to be acquired, and the second position is acquired after the knob is operated again.

4. The rotation detection method of the knob according to any one of claims 1 to 2, characterized in that, The inner shell part is located inside the fixed unit, and a spacing space is formed between the inner shell part and the fixed unit; a gear structure is arranged in the spacing space, and the gear structure abuts between the inner shell part and the fixed unit along the radial direction of the rotating unit; The rotation detection method further comprises: When the inner housing part is rotated to a certain gear, the first position or the second position is acquired.

5. The rotation detection method of the knob according to claim 1, characterized by, The panel of the cooking appliance is configured with a touch screen, the knob comprises an outer shell made of conductive material, the top rod part has conductive material for forming a conductive path with the outer shell and the panel, and the inner housing part is internally provided with a conductive part for forming a conductive path with the outer shell and the panel. The rotation detection method further comprises: The reference position, the first position and the second position are generated by detecting the capacitance change between the knob and the panel.

6. A rotation detecting device of a knob, characterized by comprising: The rotation detection device is used to perform the rotation detection method of the knob as claimed in any one of claims 1-5, and the rotation detection device is arranged in the cooking appliance.

7. A hob, characterized in that The cooking appliance comprises the rotation detection device of the knob as claimed in claim 6.

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