WO2017035933A1

WO2017035933A1 - Rotary knob structure, rotating angle determining method and device, and household electric appliance

Info

Publication number: WO2017035933A1
Application number: PCT/CN2015/093136
Authority: WO
Inventors: 李彦栋; 程艳
Original assignee: 广东美的厨房电器制造有限公司; 美的集团股份有限公司
Priority date: 2015-08-31
Filing date: 2015-10-28
Publication date: 2017-03-09
Also published as: CN105138068A; CN105138068B

Abstract

A rotary knob structure comprising an induction rotary knob (1) which is disposed on an upper surface of a panel (2) of a household electric appliance, wherein the interior of the induction rotary knob (1) is provided with a metal induction layer (7); a plurality of induction coils (9), wherein the plurality of induction coils (9) are arranged on a lower surface of the panel (2) corresponding to the metal induction layer (7) in a manner whereby every two induction coils are adjacent to each other; and an angle determining circuit board (6) which is connected to the plurality of induction coils (9) and is used for obtaining an induction parameter of the plurality of induction coils (9) and determining a current rotating angle of the induction rotary knob (1) according to the induction parameter of the plurality of induction coils (9). Also provided are a rotating angle determining method, a rotating angle determining device and a household electric appliance comprising the rotary knob structure. The rotary knob structure can prolong the service life of the induction rotary knob and other related parts and can accurately determine the rotating angle of the rotary knob, thereby achieving more accurate control of the household electric appliance.

Description

Knob structure, rotation angle determining method, device and household appliance

Technical field

The present invention relates to the field of household appliances, and in particular to a knob structure, a rotation angle determining method, a rotation angle determining device, and a household appliance.

Background technique

At present, in the related art, the knobs on the household appliances are mechanical structures, which are rotated by mechanical contacts to control the household appliances.

However, the knobs in the prior art solutions have the following drawbacks:

A: Mechanical wear is inevitable when rotating by mechanical contacts, resulting in a serious shortage of the life of the knob, and the accuracy of the control of the machine through the mechanical contacts is poor and the mechanical device is complicated.

Two: The mechanical structure of the knob needs to be connected to the inside of the household appliance through the panel, which is easy to cause the sewage to enter the household appliance through the place where the knob is connected with the panel, causing damage to its internal parts.

Three: The knob is easy to accumulate dirt and is not easy to clean.

Therefore, how to extend the service life of the knob and its related components, as well as accurately determine the rotation angle of the knob, becomes a technical problem to be solved.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, it is an object of the present invention to provide a knob structure.

Another object of the present invention is to provide a rotation angle determining method for determining the current rotation angle of the sensing knob in the knob structure described above.

Still another object of the present invention is to provide a rotation angle determining device for determining a current rotation angle of a sensing knob in the above-described knob structure.

Still another object of the present invention is to provide a home appliance including the above-described knob structure.

Still another object of the present invention is to provide a home appliance including the above-described rotation angle determining device.

In order to achieve at least one of the above objects, in accordance with an embodiment of the first aspect of the present invention, a knob structure is provided, comprising: an inductive knob disposed on an upper surface of a panel of a household appliance, wherein the inductive knob is provided with a metal sensing layer a plurality of induction coils disposed adjacently on the lower surface of the panel corresponding to the metal sensing layer; an angle determining circuit board connected to the plurality of induction coils for acquiring Sensing parameters of the plurality of induction coils, and determining a current rotation angle of the sensing knob according to the sensing parameters of the plurality of induction coils.

According to the knob structure of the embodiment of the invention, the sensing knob is disposed on the upper surface of the panel of the household appliance, wherein the sensing knob is provided with a metal sensing layer, and when the user rotates the sensing knob to control the household appliance, the metal sensing layer will follow The sensing knob is rotated to change the sensing parameters of the plurality of induction coils on the lower surface of the panel, wherein the sensing parameter may be the oscillation frequency of the plurality of induction coils, and further, the sensing of the plurality of induction coils is obtained by the angle determining circuit board The parameter and the rotation angle of the induction knob are determined according to the sensing parameters of the plurality of induction coils, thereby realizing control of the household appliance. Through the above technical solution, the problem that the mechanical induction knob is worn is avoided, and the induction knob is effectively ensured. The service life and the sensing knob can be disassembled, so that the user can clean the dirt near the sensing knob, thereby improving the user experience.

According to the knob structure of the above embodiment of the present invention, the following technical features are also possible:

According to an embodiment of the invention, the metal sensing layer comprises two symmetric arc sensing layers, and any one of the two symmetric arc sensing layers is gradually increased in width from the leading end to the end thereof. Large, wherein the head ends of the two symmetric arc sensing layers are connected, and the ends of the two symmetric arc sensing layers are connected.

According to the knob structure of the embodiment of the present invention, the metal sensing layer is formed by connecting two symmetric arc sensing layers. When the metal sensing layer rotates with the sensing knob, the sensing parameters of the plurality of induction coils rotate with the metal sensing layer. And a change occurs, for example, when the number of the plurality of induction coils is four, when the metal sensing layer is rotated, the difference between the oscillation frequencies of the two adjacent ones of the four induction coils is different from the sensing knob a sinusoidal relationship between the rotation angles, and a difference in the oscillation frequency of the other two induction coils of the four induction coils and the rotation of the induction knob There is a cosine relationship between the angles. Therefore, the metal sensing layer is formed by two symmetrical arc sensing layers, which can accurately determine the rotation angle of the sensing knob.

According to an embodiment of the second aspect of the present invention, there is provided a rotation angle determining method for determining the current rotation angle of the sensing knob in the knob structure described in any one of the above aspects, The method for determining a rotation angle includes: compensating initial sensing parameters of two non-adjacent induction coils of the plurality of induction coils, so that initial compensation parameters after compensation of the two adjacent induction coils are the same; Detecting a current sensing parameter of the plurality of induction coils when the sensing knob is rotated; calculating a first difference value of the current sensing parameter of the two adjacent sensing coils, determining according to the first difference value The current rotation angle of the sensing knob.

According to the rotation angle determining method of the embodiment of the present invention, since the metal sensing layer in the sensing knob rotates with the rotation of the sensing knob, and the sensing parameters (such as the oscillation frequency) of the plurality of induction coils corresponding to the metal sensing layer are also It will change with the rotation of the metal sensing layer, and the initial sensing parameters of the plurality of induction coils when the induction knob starts to rotate are different, and the initial sensing parameters of the two non-adjacent coils of the plurality of induction coils are adopted. The compensation is performed such that the initial sensing parameters after compensation of the two adjacent inductive coils are the same, so that the current rotation angle of the sensing knob can be more accurately determined according to the current sensing parameters of the plurality of induction coils. In addition, since the mechanical knob in the related art is avoided, the problem that the mechanical induction knob is worn is avoided, and the service life of the induction knob is effectively ensured.

According to an embodiment of the invention, the initial sensing parameters of the two adjacent ones of the plurality of induction coils are compensated to compensate the initiality of the two adjacent induction coils The step of inducing the same parameter includes: extracting a maximum sensing parameter of the plurality of induction coils as the initial sensing parameter when detecting the start of rotating the sensing knob; and calculating the two adjacent sensing coils a second difference of the initial sensing parameters; compensating the initial sensing parameter of any one of the two inductive coils that are not adjacent according to the second difference, so that the The initial induction parameters after compensation by the adjacent two induction coils are the same.

According to the rotation angle determining method of the embodiment of the present invention, when detecting that the sensing knob starts to rotate, by calculating the second difference of the initial sensing parameters of the two adjacent sensing coils, according to the The two difference values compensate the initial sensing parameters of the two inductive coils that are not adjacent, so that the initial sensing parameters after compensation of the two adjacent inductive coils are the same, for example, two non-adjacent ones when the sensing knob starts to rotate. The maximum oscillation frequency of the induction coils (ie, the initial oscillation frequency) is 99 Hz and 103 Hz, respectively, and the second difference is 4 Hz, and then the maximum oscillation frequency of 99 Hz of any one of the two induction coils that are not adjacent is compensated. That is, the maximum oscillation frequency of any of the inductive coils after compensation is 103 Hz. At this time, the maximum oscillation frequency after compensation of the two adjacent induction coils is the same. Therefore, by correcting the compensated initial sensing parameters of the two inductive coils that are not adjacent, the current rotation angle of the sensing knob can be more accurately determined according to the current sensing parameters of the plurality of induction coils.

According to an embodiment of the invention, the initial sensing parameter comprises: an initial oscillation frequency of the plurality of induction coils, and the current sensing parameter comprises: a current oscillation frequency of the plurality of induction coils.

According to the rotation angle determining method of the embodiment of the present invention, the initial sensing parameters include, but are not limited to, an initial oscillation frequency of the plurality of induction coils, and the current sensing parameters include, but are not limited to, a current oscillation frequency of the plurality of induction coils, which are driven by the sensing knob. When the metal sensing layer rotates, the current oscillation frequency of the plurality of induction coils changes with the rotation of the metal sensing layer, and the current rotation angle of the sensing knob can be more accurately determined according to the current oscillation frequency of the plurality of induction coils.

According to an embodiment of the invention, the number of the plurality of induction coils is four, and the current rotation angle of the induction knob is determined by the following formula:

Where θ represents the current rotation angle of the sensing knob, and A represents the first difference of the current oscillation frequency of any two non-adjacent coils of the plurality of induction coils, and B represents The first difference of the current oscillation frequency of the other two of the plurality of induction coils that are not adjacent to each other.

According to the rotation angle determining method of the embodiment of the present invention, when the number of the plurality of induction coils is four, four sensings are performed after the initial sensing parameters of the two adjacent ones of the plurality of induction coils are compensated The first difference between the current oscillation frequency of the two adjacent induction coils in the coil and the current rotation angle of the induction knob are sinusoidal, among the four induction coils The first difference between the current oscillation frequency of the other two adjacent induction coils and the current rotation angle of the induction knob are cosine curves, and the current rotation angle of the induction knob can be accurately calculated by the above formula.

According to the embodiment of the third aspect of the present invention, there is provided a rotation angle determining device for determining a rotation angle of the sensing knob in the knob structure according to any one of the above aspects, wherein the rotation angle is determined The device includes: a compensation unit, configured to compensate initial sensing parameters of the two adjacent ones of the plurality of induction coils, so that the initial induction parameters after the two adjacent induction coils are compensated The detecting unit is configured to detect a current sensing parameter of the plurality of induction coils when the sensing knob is rotated, and a determining unit, configured to calculate a current sensing parameter of the two adjacent sensing coils a difference, the current rotation angle of the sensing knob is determined according to the first difference.

According to the rotation angle determining device of the embodiment of the present invention, since the metal sensing layer in the sensing knob rotates with the rotation of the sensing knob, and the sensing parameters (such as the oscillation frequency) of the plurality of induction coils corresponding to the metal sensing layer are also It will change with the rotation of the metal sensing layer, and the initial sensing parameters of the plurality of induction coils when the induction knob starts to rotate are different, and the initial sensing parameters of the two non-adjacent coils of the plurality of induction coils are adopted. The compensation is performed such that the initial sensing parameters after compensation of the two adjacent inductive coils are the same, so that the current rotation angle of the sensing knob can be more accurately determined according to the current sensing parameters of the plurality of induction coils. In addition, since the mechanical knob in the related art is avoided, the problem that the mechanical induction knob is worn is avoided, and the service life of the induction knob is effectively ensured.

According to an embodiment of the present invention, the compensation unit includes: an extracting unit, configured to extract a maximum sensing parameter of the plurality of induction coils as the initial sensing parameter when detecting the start of rotating the sensing knob; a unit, configured to calculate a second difference of the initial sensing parameters of the two inductive coils that are not adjacent to each other; the compensation unit is configured to: pair the two non-adjacent pairs according to the second difference The initial inductive parameters of any one of the inductive coils are compensated such that the initial inductive parameters compensated by the two non-adjacent inductive coils are the same.

According to the rotation angle determining apparatus of the embodiment of the present invention, when detecting that the sensing knob starts to rotate, by calculating a second difference value of initial sensing parameters of the two adjacent sensing coils, the second difference is not adjacent according to the second difference The initial sensing parameters of the two induction coils are compensated, so that no phase The initial induction parameters of the two adjacent induction coils are the same. For example, the maximum oscillation frequency (ie, the initial oscillation frequency) of the two induction coils that are not adjacent when the induction knob starts to rotate is 99 Hz and 103 Hz, respectively. 4Hz, then the maximum oscillation frequency of 99Hz of any one of the two induction coils that are not adjacent is compensated, that is, the maximum oscillation frequency of any of the compensated induction coils is 103Hz, at this time, non-adjacent The maximum oscillation frequency after compensation by the two induction coils is the same. Therefore, by correcting the compensated initial sensing parameters of the two inductive coils that are not adjacent, the current rotation angle of the sensing knob can be more accurately determined according to the current sensing parameters of the plurality of induction coils.

According to the rotation angle determining apparatus of the embodiment of the present invention, the initial sensing parameters include, but are not limited to, an initial oscillation frequency of the plurality of induction coils, and the current sensing parameters include, but are not limited to, a current oscillation frequency of the plurality of induction coils, which are driven by the sensing knob. When the metal sensing layer rotates, the current oscillation frequency of the plurality of induction coils changes with the rotation of the metal sensing layer, and the current rotation angle of the sensing knob can be more accurately determined according to the current oscillation frequency of the plurality of induction coils.

According to an embodiment of the invention, the number of the plurality of induction coils is four, and the determining unit is specifically configured to determine the current rotation angle of the induction knob by the following formula:

According to the rotation angle determining device of the embodiment of the present invention, when the number of the plurality of induction coils is four, four inductions are obtained after the initial sensing parameters of the two adjacent ones of the plurality of induction coils are compensated The first difference between the current oscillation frequency of the two adjacent induction coils in the coil and the current rotation angle of the induction knob are sinusoidal, and the other two induction coils of the four induction coils are not adjacent The first difference of the current oscillation frequency and the current rotation of the induction knob The cosine curve between the rotation angles can accurately calculate the current rotation angle of the induction knob by the above formula.

According to the embodiment of the fourth aspect of the present invention, there is provided a home appliance, comprising the knob structure according to any one of the above aspects, wherein the home appliance has the knob according to any one of the above aspects. The technical effects of the same structure will not be described here.

According to the embodiment of the fifth aspect of the present invention, there is provided a home appliance comprising the rotation angle determining device according to any one of the above aspects, wherein the home appliance has any one of the above technical solutions. The same technical effect of the rotation angle determining device is not described herein.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic structural view of a knob structure according to an embodiment of the present invention;

2 is a schematic structural view of a metal sensing layer and an inductive plate according to an embodiment of the present invention;

FIG. 3 is a block diagram showing the structure of a plurality of induction coils according to an embodiment of the present invention; FIG.

4 is a flow chart showing a method of determining a rotation angle according to an embodiment of the present invention;

FIG. 5 is a flow chart showing a method of determining a rotation angle according to another embodiment of the present invention; FIG.

6 is a diagram showing the relationship between the rotation angle of the induction knob and the difference of the current oscillation frequency according to an embodiment of the present invention;

Figure 7 is a block diagram showing the structure of a rotation angle determining device according to an embodiment of the present invention;

Fig. 8 is a view showing the structure of a home appliance according to an embodiment of the present invention.

Wherein, the correspondence between the marks of the drawings of FIG. 1 to FIG. 3 and the part names is:

1 induction knob, 2 panels, 3 positioning magnets, 4 induction circuit boards, 5 adsorption magnets, 6 angle determination circuit boards, 7 metal sensing layers, 8 induction boards, 9 induction coils.

detailed description

The present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a full understanding of the invention, but the invention may be practiced otherwise than as described herein. Limitations of the embodiments.

As shown in FIG. 1 to FIG. 3, according to the embodiment of the first aspect of the present invention, a knob structure is provided, comprising: an inductive knob 1 disposed on an upper surface of a panel 2 of a household appliance, wherein the inductive knob 1 is Provided with a metal sensing layer 7; a plurality of induction coils 9 disposed adjacently on the lower surface of the panel 2 corresponding to the metal sensing layer 7; an angle determining circuit board 6, connected The plurality of induction coils 9 are used to acquire the sensing parameters of the plurality of induction coils 9, and determine the current rotation angle of the sensing knob 1 according to the sensing parameters of the plurality of induction coils 9.

According to the knob structure of the embodiment of the present invention, the sensing knob 1 is disposed on the upper surface of the panel 2 of the household appliance, wherein the sensing knob 1 is provided with a metal sensing layer 7 when the user rotates the sensing knob 1 to control the household appliance. The metal sensing layer 7 changes the sensing parameters of the plurality of induction coils 9 on the lower surface of the panel 2 as the sensing knob 1 rotates, wherein the sensing parameter may be the oscillation frequency of the plurality of induction coils 9, and further, the angle of passage It is determined that the circuit board 6 acquires the sensing parameters of the plurality of induction coils 9, and determines the rotation angle of the sensing knob 1 according to the sensing parameters of the plurality of induction coils 9, thereby realizing control of the household appliance, and the mechanical solution is avoided by the above technical solution. The sensing knob 1 has a problem of wear, which effectively ensures the service life of the sensing knob 1, and the sensing knob 1 can be disassembled, thereby facilitating the user to clean the dirt near the sensing knob 1, thereby improving the user experience.

As shown in FIG. 2, according to an embodiment of the present invention, the metal sensing layer 7 includes two a symmetric curved sensing layer, wherein any one of the two symmetric curved sensing layers gradually increases in width from a leading end to a distal end thereof, wherein the two symmetric curved sensing layers are The head ends are connected, and the ends of the two symmetrical arc sensing layers are connected.

According to the knob structure of the embodiment of the present invention, the metal sensing layer 7 is formed by connecting two symmetric arc sensing layers. When the metal sensing layer 7 rotates with the sensing knob 1, the sensing parameters of the plurality of induction coils 9 follow the metal. The rotation of the sensing layer 7 changes, for example, when the number of the plurality of induction coils 9 is four, when the metal sensing layer 7 rotates, any two of the four induction coils 9 that are not adjacent to each other The difference between the oscillation frequency and the rotation angle of the induction knob 1 has a sinusoidal relationship, and the difference between the oscillation frequencies of the two adjacent induction coils 9 of the four induction coils 9 and the rotation angle of the induction knob 1 There is a cosine relationship between them. Therefore, the metal sensing layer 7 is formed by connecting two symmetrical arc sensing layers, and the rotation angle of the sensing knob 1 can be relatively accurately determined.

As shown in FIG. 2, the inductive knob 1 includes an inductive plate 8 disposed in the inductive knob 1 for carrying the metal sensing layer 7 in accordance with an embodiment of the present invention.

According to the knob structure of the embodiment of the present invention, by providing the sensing plate 8 carrying the metal sensing layer 7 in the sensing knob 1, the metal sensing layer 7 can be rotated along with the rotation of the sensing knob 1, thereby rotating on the metal sensing layer 7. The sensing parameters of the plurality of induction coils 9 are changed to determine the current rotation angle of the sensing knob 1.

According to an embodiment of the present invention, the method further includes: an inductive circuit board 4 disposed on a lower surface of the panel 2 corresponding to the metal sensing layer 7, the sensing circuit board 4 for fixing the plurality of inductive coils 9 .

According to the knob structure of the embodiment of the present invention, the sensing circuit board 4 is disposed on the lower surface of the panel 2 of the metal sensing layer 7 for fixing the plurality of induction coils 9, thereby improving the accuracy and reliability of the knob structure.

According to an embodiment of the present invention, the sensing circuit board 4 is fixed to the lower surface of the panel 2 by glue, or the sensing circuit board 4 is fixed to the lower surface of the panel 2 by a bracket.

According to the knob structure of the embodiment of the present invention, the sensing circuit board 4 can be fixed on the lower surface of the panel 2 by glue or bracket, and then used to fix the plurality of sensing through the fixed sensing circuit board 4. The coil 9 further enhances the accuracy and reliability of the knob structure.

According to an embodiment of the present invention, the positioning magnet 3 is rotatably disposed on the upper surface of the panel 2 by the positioning magnet 3, and the adsorption magnet 5 is disposed corresponding to the positioning magnet 3. The lower surface of the panel 2, the magnetic pole of the adsorption magnet 5 is opposite to the magnetic pole of the positioning magnet 3, and the adsorption magnet 5 is used to generate a force of attraction with the positioning magnet 3 to make the positioning magnet 3 is fixed to the upper surface of the panel 2.

According to the knob structure of the embodiment of the present invention, by arranging the positioning magnet 3 on the upper surface of the panel 2, the adsorption magnet 5 is provided on the lower surface of the panel 2, and since the magnetic poles of the positioning magnet 3 and the adsorption magnet 5 are opposite, the magnetic poles can be reversed. The attracting force generated by the positioning magnet 3 and the attracting magnet 5 is fixed to fix the positioning magnet 3, so that the sensing knob 1 is rotatably provided on the upper surface of the panel 2 by the positioning magnet 3. Through the above technical solution, the mechanical knob is prevented from passing through the hole of the panel 2 and the inside of the panel 2, thereby preventing water from entering the inside of the panel 2 through the hole in the panel 2, thereby extending the service life of the household appliance. This improves the user experience.

According to an embodiment of the present invention, comprising: a fixed magnet, the induction knob 1 is rotatably disposed on an upper surface of the panel 2 by the fixed magnet; and the fixed iron block is disposed on the corresponding one of the fixed magnets On the lower surface of the panel 2, the fixed iron block is used to generate a force of attraction with the fixed magnet to fix the fixed magnet to the upper surface of the panel 2.

According to the knob structure of the embodiment of the present invention, by providing a fixed magnet on the upper surface of the panel 2, a fixed iron block is provided on the lower surface of the panel 2, so that the force of the suction generated by the fixed magnet and the fixed iron block can be achieved. The fixed magnet is fixed so that the induction knob 1 is rotatably provided on the upper surface of the panel 2 by the fixed magnet. Through the above technical solution, the mechanical knob is prevented from passing through the hole of the panel 2 and the inside of the panel 2, thereby preventing water from entering the inside of the panel 2 through the hole in the panel 2, thereby extending the service life of the household appliance. This improves the user experience.

According to an embodiment of the present invention, comprising: a fixed suction cup, the induction knob 1 is rotatably disposed on an upper surface of the panel 2 by the fixed suction cup.

According to the knob structure of the embodiment of the present invention, the sensing knob 1 can be rotatably disposed on the upper surface of the panel 2 by a fixed suction cup, wherein the fixed suction cup can be made of plastic material or rubber material. It is made of quality, so that the normal suction of the induction knob 1 can be realized by the strong suction force of the fixed suction cup, and the mechanical knob is prevented from passing through the hole of the panel 2 and the inside of the panel 2, thereby preventing water from passing through the panel 2. The hole enters the inside of the panel 2, thereby extending the life of the household appliance, thereby improving the user experience.

4 is a flow chart showing a method of determining a rotation angle according to an embodiment of the present invention.

As shown in FIG. 4, according to an embodiment of the second aspect of the present invention, a rotation angle determining method is provided for determining the said knob of the knob structure in the knob structure described in any one of the above aspects. The current rotation angle, the rotation angle determination method includes:

Step 402: Compensating initial sensing parameters of two non-adjacent induction coils of the plurality of induction coils, so that initial compensation parameters after compensation of the two adjacent induction coils are the same;

Step 404: Detect a current sensing parameter of the plurality of induction coils when the sensing knob is rotated;

Step 406: Calculate a first difference value of the current sensing parameter of the two inductive coils that are not adjacent, and determine the current rotation angle of the sensing knob according to the first difference value.

According to an embodiment of the present invention, the step 402 includes: when detecting the start of rotating the sensing knob, extracting a maximum sensing parameter of the plurality of induction coils as the initial sensing parameter; calculating the non-adjacent a second difference of the initial inductive parameters of the two inductive coils; according to the second difference, to any one of the two inductive coils that are not adjacent to each other The initial sensing parameters are compensated such that the initial sensing parameters after compensation of the two adjacent inductive coils are the same.

According to the rotation angle determining method of the embodiment of the present invention, when detecting that the sensing knob starts rotating, the second difference value of the initial sensing parameters of the two inductive coils that are not adjacent is calculated, and the second difference is not adjacent according to the second difference. The initial sensing parameters of the two induction coils are compensated such that the initial induction parameters after compensation of the two adjacent induction coils are the same, for example, the maximum oscillation frequency of the two induction coils that are not adjacent when the induction knob starts to rotate ( That is, the initial oscillation frequency is 99 Hz and 103 Hz, respectively, and the second difference is 4 Hz, and then the maximum oscillation frequency of 99 Hz of any one of the two induction coils that are not adjacent is compensated, that is, any compensation after compensation The maximum oscillation frequency of the coil is 103 Hz. At this time, the maximum oscillation frequency after compensation of the two adjacent induction coils is the same. Therefore, by correcting the compensated initial sensing parameters of the two inductive coils that are not adjacent, the current rotation angle of the sensing knob can be more accurately determined according to the current sensing parameters of the plurality of induction coils.

According to the rotation angle determining method of the embodiment of the present invention, when the number of the plurality of induction coils is four, four sensings are performed after the initial sensing parameters of the two adjacent ones of the plurality of induction coils are compensated The first difference between the current oscillation frequency of the two adjacent induction coils in the coil and the current rotation angle of the induction knob are sinusoidal, and the other two induction coils of the four induction coils are not adjacent The cosine curve is between the first difference of the current oscillation frequency and the current rotation angle of the induction knob, and the current rotation angle of the induction knob can be accurately calculated by the above formula.

5 is a flow chart showing a method of determining a rotation angle according to another embodiment of the present invention; and FIG. 6 is a schematic diagram showing a relationship between a rotation angle of an induction knob and a current oscillation frequency according to an embodiment of the present invention. .

The technical solution of the present invention will be described in detail below with reference to FIG. 5 and FIG. 6 :

As shown in FIG. 5, a rotation angle determining method according to another embodiment of the present invention (in this embodiment, the number of the plurality of induction coils is four, which are the coil 21, the coil 22, the coil 23, and the coil 24, respectively. The coil 21 is adjacent to the coil 22 and the coil 24, the coil 22 is adjacent to the coil 21 and the coil 23, the coil 23 is adjacent to the coil 22 and the coil 24, and the coil 24 is adjacent to the coil 23 and the coil 21, and includes:

Step 502, when the rotation of the induction knob is started, the oscillation frequencies of the coil 21, the coil 22, the coil 23, and the coil 24 are respectively acquired.

In step 504, the maximum oscillation frequency (initial sensing parameter) of the coil 21, the coil 22, the coil 23, and the coil 24 is extracted.

Step 506, calculating a second difference of the maximum oscillation frequency of the coil 21 and the coil 23, and calculating a second difference of the maximum oscillation frequency of the coil 22 and the coil 24.

Step 508, compensating the coil 21 or the coil 23 according to the second difference of the maximum oscillation frequency of the coil 21 and the coil 23, and performing the coil 22 or the coil 24 according to the second difference of the maximum oscillation frequency of the coil 22 and the coil 24. The compensation is such that the maximum oscillation frequency of the compensated coil 21 and the coil 23 is the same, and the maximum oscillation frequency of the compensated coil 22 and the coil 24 is the same.

Step 510, calculating a first difference B of the current oscillation frequency of the compensated coil 21 and the compensated coil 23, and calculating a first difference A of the current oscillation frequency of the compensated coil 22 and the compensated coil 24.

Step 512, as shown in FIG. 6, B has a sinusoidal correspondence with the current rotation angle of the induction knob, and A has a cosine correspondence with the current rotation angle of the induction knob, wherein in the curve of B and the rotation angle, the vertical axis represents compensation. The current oscillation frequency of the rear coil 21 and the compensated coil 23 is the first difference B, and the horizontal axis represents the current rotation angle; in the curve of A and the rotation angle, the vertical axis represents the current oscillation frequency of the compensated coil 22 and the compensated coil 24. The first difference A, the horizontal axis represents the current rotation angle. Therefore, the current rotation angle of the sensing knob can be determined according to A and B.

Fig. 7 is a block diagram showing the structure of a rotation angle determining device according to an embodiment of the present invention.

As shown in FIG. 7, a rotation angle determining device 700 according to an embodiment of the present invention is configured to determine a rotation angle of the sensing knob in the knob structure according to any one of the above aspects, wherein the rotation angle is determined. The device 700 includes: a compensation unit 702, configured to compensate initial sensing parameters of two adjacent ones of the plurality of induction coils to compensate for initiality of the two adjacent induction coils The sensing unit 704 is configured to detect a current sensing parameter of the plurality of induction coils when the sensing knob is rotated, and the determining unit 706 is configured to calculate the current current of the two sensing coils that are not adjacent to each other. And sensing a first difference of the parameter, and determining the current rotation angle of the sensing knob according to the first difference.

According to the rotation angle determining device 700 of the embodiment of the present invention, since the metal sensing layer in the sensing knob rotates with the rotation of the sensing knob, and the sensing parameters (such as the oscillation frequency) of the plurality of induction coils corresponding to the metal sensing layer are simultaneously It also changes with the rotation of the metal sensing layer, and the initial sensing parameters of the plurality of induction coils when the sensing knob starts to rotate are different, and the initial sensing of the two adjacent sensing coils of the plurality of induction coils is performed. The parameters are compensated so that the initial sensing parameters after compensation of the two adjacent inductive coils are the same, so that the current rotation angle of the sensing knob can be more accurately determined according to the current sensing parameters of the plurality of induction coils. In addition, since the mechanical knob in the related art is avoided, the problem that the mechanical induction knob is worn is avoided, and the service life of the induction knob is effectively ensured.

According to an embodiment of the present invention, the compensation unit 702 includes: an extracting unit 7022, configured to extract a maximum sensing parameter of the plurality of induction coils as the initial sensing parameter when detecting that the sensing knob is started to be rotated a calculating unit 7024, configured to calculate a second difference of the initial sensing parameters of the two inductive coils that are not adjacent; the compensation unit 702 is specific And configured to compensate the initial sensing parameter of any one of the two inductive coils that are not adjacent according to the second difference, so that the two adjacent inductive coils are compensated The initial sensing parameters are the same.

The rotation angle determining device 700 according to the embodiment of the present invention, when detecting that the sensing knob starts to rotate, calculates a second difference of initial sensing parameters of the two inductive coils that are not adjacent, and is not adjacent according to the second difference pair. The initial sensing parameters of the two inductive coils are compensated such that the initial inductive parameters of the two inductive coils that are not adjacent are compensated for the same, for example, the maximum oscillation frequency of the two inductive coils that are not adjacent when the inductive knob begins to rotate. (ie, the initial oscillation frequency) is 99 Hz and 103 Hz, respectively, and the second difference is 4 Hz. Then, the maximum oscillation frequency of 99 Hz of any one of the two induction coils that are not adjacent is compensated, that is, any of the compensated ones. The maximum oscillation frequency of the induction coil is 103 Hz. At this time, the maximum oscillation frequency after compensation of the two adjacent induction coils is the same. Therefore, by correcting the compensated initial sensing parameters of the two inductive coils that are not adjacent, the current rotation angle of the sensing knob can be more accurately determined according to the current sensing parameters of the plurality of induction coils.

According to the rotation angle determining apparatus 700 of the embodiment of the present invention, the initial sensing parameters include, but are not limited to, an initial oscillation frequency of the plurality of induction coils, and the current sensing parameters include, but are not limited to, a current oscillation frequency of the plurality of induction coils, due to the sensing knob When the metal sensing layer is rotated, the current oscillation frequency of the plurality of induction coils changes with the rotation of the metal sensing layer, and the current rotation angle of the sensing knob can be more accurately determined according to the current oscillation frequency of the plurality of induction coils.

According to an embodiment of the invention, the number of the plurality of induction coils is four, and the determining unit 706 is specifically configured to determine the current rotation angle of the induction knob by the following formula:

According to the rotation angle determining device 700 of the embodiment of the present invention, when the number of the plurality of induction coils is four, after the initial sensing parameters of the two adjacent ones of the plurality of induction coils are compensated, four The first difference between the current oscillation frequency of the two adjacent induction coils in the induction coil and the current rotation angle of the induction knob are sinusoidal, and the other two induction coils of the four induction coils are not adjacent. The first difference between the current oscillation frequency and the current rotation angle of the induction knob is a cosine curve, and the current rotation angle of the induction knob can be accurately calculated by the above formula.

As shown in FIG. 8, a home appliance 800 according to an embodiment of the present invention includes the rotation angle determining device 700 according to any one of the above aspects, and therefore, the home appliance 800 has any one of the above technical solutions. The same technical effects of the rotation angle determining device 700 are not described herein.

The technical solution of the present invention is described in detail above with reference to the accompanying drawings, and the rotation angle of the induction knob can be relatively accurately determined to achieve more accurate control of the home appliance, and the service life of the induction knob and its related components can be extended.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A knob structure, comprising:

The sensing knob is disposed on an upper surface of the panel of the household appliance, and the sensing knob is provided with a metal sensing layer;

a plurality of induction coils, the plurality of induction coils being disposed adjacent to each other on a lower surface of the panel corresponding to the metal sensing layer;

An angle determining circuit board is connected to the plurality of induction coils for acquiring sensing parameters of the plurality of induction coils, and determining a current rotation angle of the sensing knob according to the sensing parameters of the plurality of induction coils.
The knob structure according to claim 1, wherein the metal sensing layer comprises two symmetric arc sensing layers, and any one of the two symmetric arc sensing layers is from the first The end-to-end width is gradually increased, wherein the leading ends of the two symmetric arc-shaped sensing layers are connected, and the ends of the two symmetric arc-shaped sensing layers are connected.
A method for determining a rotation angle, which is used for determining the current rotation angle of the sensing knob in the knob structure according to claim 1 or 2, wherein the rotation angle determining method comprises:

Compensating for initial sensing parameters of two non-adjacent induction coils of the plurality of induction coils, so that the initial induction parameters after compensation of the two non-adjacent induction coils are the same;

Detecting a current sensing parameter of the plurality of induction coils when the sensing knob is rotated;

Calculating a first difference of the current sensing parameters of the two inductive coils that are not adjacent, and determining the current rotation angle of the sensing knob according to the first difference.
The method for determining a rotation angle according to claim 3, wherein the initial sensing parameters of the two adjacent ones of the plurality of induction coils are compensated to make the non-adjacent The steps of the same initial sensing parameters after compensation by the two induction coils include:

Extracting, when the rotation of the sensing knob is started, extracting a maximum sensing parameter of the plurality of induction coils as the initial sensing parameter;

Calculating a second difference of the initial sensing parameters of the two inductive coils that are not adjacent;

Compensating the initial sensing parameter of any one of the two inductive coils that are not adjacent according to the second difference, so that the initial sensing after the two adjacent inductive coils are compensated The parameters are the same.
The method for determining a rotation angle according to claim 3 or 4, wherein the initial sensing parameter comprises: an initial oscillation frequency of the plurality of induction coils, and the current sensing parameter comprises: the plurality of induction coils Current oscillation frequency.
The rotation angle determining method according to claim 5, wherein the number of the plurality of induction coils is four, and the current rotation angle of the induction knob is determined by the following formula:

Where θ represents the current rotation angle of the sensing knob, and A represents the first difference of the current oscillation frequency of any two non-adjacent coils of the plurality of induction coils, and B represents The first difference of the current oscillation frequency of the other two of the plurality of induction coils that are not adjacent to each other.
A rotation angle determining device for determining a rotation angle of the sensing knob in the knob structure according to claim 1 or 2, the rotation angle determining device comprising:

a compensation unit, configured to compensate initial sensing parameters of the two adjacent ones of the plurality of induction coils, so that the initial induction parameters after compensation of the two adjacent induction coils are the same;

a detecting unit, configured to detect a current sensing parameter of the plurality of induction coils when the sensing knob is rotated;

a determining unit, configured to calculate a first difference value of the current sensing parameter of the two inductive coils that are not adjacent, and determine the current rotation angle of the sensing knob according to the first difference value.
The rotation angle determining device according to claim 7, wherein the compensation unit comprises:

An extracting unit, configured to extract the plurality of senses when detecting to start rotating the sensing knob The maximum sensing parameter of the coil should be used as the initial sensing parameter;

a calculating unit, configured to calculate a second difference of the initial sensing parameters of the two inductive coils that are not adjacent;

The compensation unit is configured to compensate the initial sensing parameter of any one of the two inductive coils that are not adjacent according to the second difference, so that the two adjacent ones are not adjacent. The initial sensing parameters after compensation by the induction coil are the same.
The rotation angle determining device according to claim 7 or 8, wherein the initial sensing parameter comprises: an initial oscillation frequency of the plurality of induction coils, and the current sensing parameter comprises: the plurality of induction coils Current oscillation frequency.
The rotation angle determining device according to claim 9, wherein the number of the plurality of induction coils is four, and the determining unit is specifically configured to determine the current rotation of the sensing knob by the following formula angle:

Where θ represents the current rotation angle of the sensing knob, and A represents the first difference of the current oscillation frequency of any two non-adjacent coils of the plurality of induction coils, and B represents The first difference of the current oscillation frequency of the other two of the plurality of induction coils that are not adjacent to each other.
A household appliance, comprising: the knob structure according to claim 1 or 2.
A household appliance, comprising: the rotation angle determining device according to any one of claims 7 to 10.