Cooking device and control method thereof

Abstract

The invention relates to a cooking device and a control method thereof.The cooking device comprises a range hood and a stove located below the range hood, the range hood comprises a smoke collecting hood, an air inlet assembly restrained on the smoke collecting hood in the mode that the air inlet assembly can ascend and descend relative to the smoke collecting hood, and a lifting module driving the air inlet assembly to ascend and descend; the cooking device is characterized by further comprising a camera arranged on the front side of the exhaust fume collecting hood; and the controller is connected with the camera and the lifting module, and the controller is configured to calculate the distance between the top of a cooker placed on the cooker and the bottom of the exhaust fume collecting hood according to an image above the cooker shot by the camera in a zooming manner, and further control the lifting module to perform corresponding actions. The intelligent cooker has the advantages that the intelligent cooker can adapt to various different cookware in a camera detection mode, compared with a distance sensor, the application range is wider, the situation that the air inlet assembly ascends and descends and touches the cookware can be effectively avoided, and the use experience feeling of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular to a cooking device and a control method thereof. Background Art

[0002] Range hoods are essential appliances for people to absorb oil fumes during daily cooking. Traditional range hoods generally provide users with a fixed air inlet height, but the oil fume extraction effect is difficult to match with pots and pans.

[0003] To solve the above problems, a Chinese utility model patent with patent number ZL202322037858.2 (authorization announcement number CN220506839U) discloses a lift-type range hood, which can adjust the height of the air inlet during operation to adapt to cookware of different heights and sizes. When close to the cookware, a lower gear is used to absorb oil fumes, which can reduce noise and achieve better oil fume absorption effect. When at a higher position away from the cookware, a large gear is used to increase the air volume to ensure the oil fume absorption effect, slightly sacrificing noise.

[0004] However, the above-mentioned lifting range hood is easy to hit the pot or pot cover during the lifting process. In the prior art, microwave distance sensors are usually used for pot detection. However, microwave distance sensors are mainly used for single-point distance detection. For concave pots, because the middle concave may become convex after the pot cover is covered, if the fixed distance sensor is placed in the middle, it cannot detect the edge when the pot cover is not covered (the edge is higher at this time). When the distance sensor is placed on the edge to detect the edge of the pot, because the diameters of pots in different users' homes are different, and sometimes users cover the pot cover (at this time, the middle pot cover handle is higher), it is difficult to take into account the detection of different positions and cannot adapt to the detection of pots of different diameters. It is inevitable that the lifting air inlet will hit the pot, causing the pot to be crushed or an accident. For this reason, further improvements to the prior art are needed. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a cooking device that can effectively prevent the air inlet assembly from touching the pot due to the lifting of the air inlet assembly in view of the above-mentioned prior art.

[0006] The second technical problem to be solved by the present invention is to provide a control method for the cooking device as mentioned above.

[0007] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a cooking device, comprising a range hood and a cooking appliance located below the range hood, wherein the range hood comprises a smoke collecting hood, an air inlet assembly constrained on the smoke collecting hood in a manner that it can be lifted up and down relative to the smoke collecting hood, and a lifting module for driving the air inlet assembly to lift up and down, characterized in that the cooking device also comprises:

[0008] A camera is arranged on the front side of the smoke collecting hood;

[0009] The controller is connected to the camera and the lifting module, and is configured to calculate the distance between the top of the pot placed on the stove and the bottom of the smoke hood according to the image above the stove taken by the camera through zoom, and then control the lifting module to perform corresponding actions.

[0010] Preferably, the camera is tilted downward at a certain angle to the horizontal direction.

[0011] Preferably, the camera is arranged adjacent to the bottom of the front side of the smoke collecting hood.

[0012] The technical solution adopted by the present invention to solve the second technical problem is: a control method of the cooking device as described above, characterized in that it comprises the following steps:

[0013] Step 1. Start the camera;

[0014] Step 2: Use the camera to take a clear image of the area above the stove;

[0015] Step 3: Adjust the focal length and then use the camera to take a blurred image of the area above the stove.

[0016] Step 4: Calculate the distance between the top of the pot placed on the stove and the bottom of the smoke hood according to the blurred image captured by the camera zoom;

[0017] Step 5, calculating the distance △d between the bottom of the air inlet assembly and the top of the pot placed on the cooker, and judging whether the pot placed on the cooker will collide with the bottom of the air inlet assembly according to the distance △d, if so, controlling the air inlet assembly to rise, and controlling the fan of the range hood to adjust to the corresponding working gear according to the distance between the bottom of the air inlet assembly after the rise and the top of the pot placed on the cooker, and ending; if not, proceeding to step 6;

[0018] Step 6, determine whether the air inlet assembly is lowered to the lowest position. If so, control the lifting module to stop moving, switch the range hood fan to or maintain a low gear, and end; if not, control the lifting module to continue moving so that the air inlet assembly continues to descend, and proceed to step 3.

[0019] Specifically, the specific steps of calculating the distance between the top of the pot placed on the stove and the bottom of the smoke hood in step 4 are:

[0020] Step 4-1, obtaining the spot radius R formed by the camera lens imaging on the defocused plane by blurring the image;

[0021] Step 4-2: Use the following calculation formula to obtain the depth d1 between the top of the pot placed above the stove and the camera lens. The calculation formula is:

[0022]

[0023] Wherein, C is the diameter of the camera lens, V0 is the distance between the defocus plane and the camera lens, and f is the focal length; the above C, v0 and f are all known values;

[0024] Step 4-3, measure the height H2 between the preset module under the range hood and the bottom of the smoke hood, and obtain the depth d2 between the preset module under the range hood and the camera lens according to the same calculation formula as in step 4-2. The height H1 between the top of the pot placed on the cooker and the bottom of the smoke hood is calculated using the formula.

[0025] Preferably, the preset module below the range hood in step 4-3 is an air inlet assembly that is at least partially exposed from the smoke hood, the above H2 is the height between the bottom of the air inlet assembly and the bottom of the smoke hood, and the above d2 is the depth between the bottom of the air inlet assembly and the lens of the camera.

[0026] Furthermore, in step 5, the distance △d between the bottom of the air inlet assembly and the top of the pot placed on the stove is H2-H1. If △d>0, it means that the pot placed on the stove will collide with the bottom of the air inlet assembly; if △d<0, it means that the pot placed on the stove will not collide with the bottom of the air inlet assembly.

[0027] Compared with the prior art, the advantages of the present invention are: by setting a camera and a controller, the controller is connected to the camera and the lifting module, and the distance between the top of the pot placed on the stove and the bottom of the smoke hood is calculated according to the image above the stove captured by the camera zoom, and the controller can then control the lifting module to perform corresponding actions. Therefore, the cooking device can realize intelligent detection of whether the air inlet assembly in the space between the bottom of the range hood and the stove table will collide with the pot during the lifting movement, and adjust the height of the air inlet assembly in time; and it can adapt to various different pots through camera detection. Compared with the distance sensor, it is suitable for a wider range, and can effectively avoid the situation where the air inlet assembly touches the pot when it is lifted and lowered, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of a cooking device in an embodiment of the present invention;

[0029] Figure 2 for Figure 1 Side view of

[0030] Figure 3 for Figure 2 A side view of the middle air inlet assembly being lowered so that the air inlet portion is exposed outside the smoke hood;

[0031] Figure 4 for Figure 3 A side view of the middle air inlet assembly as it continues to descend;

[0032] Figure 5 Schematic diagram of camera zoom imaging in an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of obtaining the height between the top of a pot placed on a cooker and the bottom of a smoke collecting hood in an embodiment of the present invention;

[0034] Figure 7 4 is a flow chart of a control method for a cooking device in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the accompanying drawings.

[0036] like Figure 1 As shown, the cooking device in this embodiment includes a range hood 1 and a stove 2 located below the range hood 1. The range hood 1 includes a smoke hood 11, an air inlet assembly 12 constrained on the smoke hood 11 in a manner that it can be lifted up and down relative to the smoke hood 11, and a lifting module that drives the air inlet assembly 12 to be lifted. A fan frame 13 is also provided above the smoke hood 11. A fan is provided in the fan frame 13. The structure of the fan is prior art and will not be described in detail here. The air inlet assembly 12 and the lifting module in this embodiment can refer to the contents disclosed in the Chinese utility model patent "A lifting range hood" with patent number ZL202322037858.2 (authorization announcement number CN220506839U) previously applied by the applicant. The specific state of the air inlet assembly 12 is as follows: Figures 2 to 4 shown.

[0037] The cooking device in this embodiment further includes a camera 3 and a controller. The camera 3 is disposed on the front side of the smoke collecting hood 11; Figure 2 As shown, the camera 3 is tilted downward at a certain angle to the horizontal direction; and the camera 3 is arranged near the front bottom of the smoke hood 11; the controller is connected to the camera 3 and the lifting module, and the controller is configured to: calculate the distance between the top of the pot 21 placed on the stove 2 and the bottom of the smoke hood 11 according to the image above the stove 2 taken by the camera 3 with zoom, and then control the lifting module to perform corresponding actions.

[0038] like Figure 7 As shown, the control method of the cooking device in this embodiment includes the following steps:

[0039] Step 1. Start the camera;

[0040] Step 2: Use the camera to take a clear image of the area above the stove;

[0041] Step 3: Adjust the focal length and then use the camera to take a blurred image of the area above the stove.

[0042] Step 4: Calculate the distance between the top of the pot placed on the stove and the bottom of the smoke hood according to the blurred image captured by the camera zoom;

[0043] In this embodiment, the specific steps for calculating the distance between the top of the pot placed on the stove and the bottom of the smoke collecting hood are:

[0044] Step 4-1, obtaining the spot radius R formed by the camera lens imaging on the defocused plane by blurring the image;

[0045] Step 4-2: Use the following calculation formula to obtain the depth d1 between the top of the pot placed above the stove and the camera lens. The calculation formula is:

[0046]

[0047] Wherein, C is the diameter of the camera lens, V0 is the distance between the defocus plane and the camera lens, and f is the focal length; the above C, V0 and f are all known values;

[0048] Step 4-3, measure the height H2 between the preset module under the range hood and the bottom of the smoke hood, and obtain the depth d2 between the preset module under the range hood and the camera lens according to the same calculation formula as in step 4-2. The height H1 between the top of the pot placed on the cooker and the bottom of the smoke hood is calculated by the formula;

[0049] In this embodiment, the preset module below the range hood is an air inlet assembly that is at least partially exposed to the fume hood, the above H2 is the height between the bottom of the air inlet assembly and the bottom of the fume hood, and the above d2 is the depth between the bottom of the air inlet assembly and the lens of the camera;

[0050] Step 5, calculating the distance △d between the bottom of the air inlet assembly and the top of the pot placed on the cooker, and judging whether the pot placed on the cooker will collide with the bottom of the air inlet assembly according to the distance △d, if so, controlling the air inlet assembly to rise, and controlling the fan of the range hood to adjust to the corresponding working gear according to the distance between the bottom of the air inlet assembly after the rise and the top of the pot placed on the cooker, and ending; if not, proceeding to step 6;

[0051] In this embodiment, the distance between the bottom of the air inlet assembly and the top of the pot placed on the cooker is △dd=H2-H1. If △d>0, it means that the pot placed on the cooker will collide with the bottom of the air inlet assembly; if △d<0, it means that the pot placed on the cooker will not collide with the bottom of the air inlet assembly.

[0052] Step 6, determine whether the air inlet assembly is lowered to the lowest position. If so, control the lifting module to stop moving, switch the range hood fan to or maintain a low gear, and end; if not, control the lifting module to continue moving so that the air inlet assembly continues to descend, and proceed to step 3.

[0053] The specific method of obtaining the calculation formula in the above step 4-2 is:

[0054] like Figure 5 As shown, the plane where the camera lens is located is recorded as 1c, the defocused plane is recorded as 1b, the focusing plane when the camera is diagonally clear is recorded as 1a, and the distance between the focusing plane when the camera is diagonally clear and the camera lens is V. When the camera lens focuses on a point on the object, an image is formed on the focusing plane. According to the imaging principle of the camera in physics, the mathematical relationship between the focal length f, the object distance d and the image distance V is as follows:

[0055]

[0056] When the focal length is adjusted so that the image is formed on the defocus plane (when the defocus plane does not coincide with the focus plane), the light emitted by the object point is imaged on the defocus plane through the camera lens and is no longer a point, but a blurred circle with a radius of R and a diameter of 2R.

[0057] According to the triangle geometric similarity law, we can get:

[0058]

[0059] Therefore, combining the above two calculation formulas, we can get

[0060]

[0061] In addition, Figure 6 As shown, the X-axis is established in the horizontal direction and the Y-axis is established in the vertical direction. The position of the camera is as follows Figure 6 The N point in the coordinate system (i.e., the origin of the coordinate axis), the top of the pot placed on the cooker is recorded as point B, the bottom of the air inlet assembly is recorded as point D, points A and C are both points on the bottom of the smoke hood, the line segment formed by points AB is the height H1 between the top of the pot placed on the cooker and the bottom of the smoke hood; the line segment formed by points CD is the height H2 between the bottom of the air inlet assembly and the bottom of the smoke hood; according to the similarity law, we can get: Since H2 can be measured in advance, in this embodiment, The height H1 between the top of the pot placed on the cooker and the bottom of the smoke hood is obtained by the calculation formula.

[0062] Should Figure 7 It also includes judging whether to turn on the intelligent operation mode of the air inlet component. The range hood in this embodiment can manually operate the lifting of the air inlet component, and the camera in this embodiment is not needed at this time; of course, in order to realize intelligent control, it is necessary to capture images through the camera, and then realize intelligent detection of whether the air inlet component in the space between the bottom of the range hood and the stove top will collide with the pot during the lifting movement, stop or adjust the height of the air inlet component in time, and then automatically adjust the fan gear according to the height of the air inlet component to meet the user's oil fume and noise experience.

[0063] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A cooking device, comprising a range hood (1) and a cooking appliance (2) located below the range hood (1), wherein the range hood (1) comprises a fume hood (11), an air inlet assembly (12) constrained on the fume hood (11) in a manner capable of being lifted up and down relative to the fume hood (11), and a lifting module for driving the air inlet assembly (12) to lift up and down, characterized in that The cooking device also includes: A camera (3) is arranged on the front side of the smoke collecting hood (11); A controller is connected to the camera (3) and the lifting module, and the controller is configured to calculate the distance between the top of the pot (21) placed on the stove (2) and the bottom of the smoke hood (11) based on the image above the stove (2) photographed by the camera (3) through zoom, and then control the lifting module to perform corresponding actions.

2. The cooking device according to claim 1, characterized in that: The camera (3) is tilted downward at a certain angle to the horizontal direction.

3. The cooking device according to claim 2, characterized in that: The camera (3) is arranged adjacent to the front bottom of the smoke collecting hood (11).

4. A control method for a cooking device as claimed in claim 3, characterized in that The steps include: Step 1. Start the camera; Step 2: Use the camera to take a clear image of the area above the stove; Step 3: Adjust the focal length and then use the camera to take a blurred image of the area above the stove. Step 4: Calculate the distance between the top of the pot placed on the stove and the bottom of the smoke hood according to the blurred image captured by the camera zoom; Step 5, calculating the distance △d between the bottom of the air inlet assembly and the top of the pot placed on the cooker, and judging whether the pot placed on the cooker will collide with the bottom of the air inlet assembly according to the distance △d, if so, controlling the air inlet assembly to rise, and controlling the fan of the range hood to adjust to the corresponding working gear according to the distance between the bottom of the air inlet assembly after the rise and the top of the pot placed on the cooker, and ending; if not, proceeding to step 6; Step 6, determine whether the air inlet assembly is lowered to the lowest position. If so, control the lifting module to stop moving, switch the range hood fan to or maintain a low gear, and end; if not, control the lifting module to continue moving so that the air inlet assembly continues to descend, and proceed to step 3.

5. The control method according to claim 4, characterized in that: The specific steps for calculating the distance between the top of the pot placed on the stove and the bottom of the smoke hood in step 4 are: Step 4-1, obtaining the spot radius R formed by the camera lens imaging on the defocused plane by blurring the image; Step 4-2: Use the following calculation formula to obtain the depth d1 between the top of the pot placed above the stove and the camera lens. The calculation formula is: Wherein, C is the diameter of the camera lens, V0 is the distance between the defocus plane and the camera lens, and f is the focal length; the above C, V0 and f are all known values; Step 4-3, measure the height H2 between the preset module under the range hood and the bottom of the smoke hood, and obtain the depth d2 between the preset module under the range hood and the camera lens according to the same calculation formula as in step 4-2. The height H1 between the top of the pot placed on the cooker and the bottom of the smoke hood is calculated using the formula.

6. The control method according to claim 5, characterized in that: The preset module below the range hood in step 4-3 is an air inlet assembly that is at least partially exposed from the smoke hood, the above H2 is the height between the bottom of the air inlet assembly and the bottom of the smoke hood, and the above d2 is the depth between the bottom of the air inlet assembly and the lens of the camera.

7. The control method according to claim 6, characterized in that: In step 5, the distance △d between the bottom of the air inlet assembly and the top of the pot placed on the stove is H2-H1. If △d>0, it means that the pot placed on the stove will collide with the bottom of the air inlet assembly; if △d<0, it means that the pot placed on the stove will not collide with the bottom of the air inlet assembly.

Images