A method for detecting overflowing pot and a smoke stove linkage control device

Abstract

The present invention relates to a pot overflow detection method and a smoke stove linkage control device, which are used to detect the pot overflow state of a non-planar pot cover, and are characterized in that: a distance measuring sensor which transmits signals vertically downward and has four irradiation points on the pot cover that are not on the same plane is arranged just above the gas stove burner; when the pot is covered with a pot cover, the equivalent spherical center coordinates of the non-planar pot cover in the initial state are calculated first; in the subsequent cooking process, the equivalent spherical center coordinates of the non-planar pot cover at the current moment are recalculated. i , then according to R and R i , calculate the displacement of the equivalent sphere center ΔS i If the equivalent spherical center displacement is greater than or equal to the preset pot overflow threshold, it is determined that the pot overflow phenomenon occurs at the current moment. Compared with the prior art, the advantages of the present invention are: the distances of four non-coplanar points on the pot cover surface are measured by four distance measuring sensors, the movement of the pot cover is accurately calculated, and the pot overflow state of the pot is inferred, and the implementation method is simple and reliable.

Description

Technical Field

[0001] The invention relates to a pot overflow detection method and a smoke stove linkage control device. Background Art

[0002] As gas stoves enter the homes of ordinary people, the pot overflow phenomenon is often encountered during the cooking process of steaming, boiling, stewing and other cooking processes that require a lot of water. On the one hand, the pot overflow will pollute the burner of the gas stove, block the fire hole, reduce the combustion efficiency, and be difficult to clean. On the other hand, the liquid overflowing from the pot may extinguish the flame of the burner. Once the thermocouple fails, it will cause gas leakage, which is very dangerous.

[0003] In the prior art, there is a technical solution to prevent the pot from overflowing by measuring the temperature of the side wall of the pot and using the change of the temperature map of the pot wall to control the firepower or temperature of the stove. However, there are certain limitations in detecting whether the pot is overflowing based on the change of the temperature map. If there is wind blowing on the side wall of the pot or water splashing on the side wall of the pot, it will also cause the temperature map to change, leading to misjudgment. In addition, the cost of thermometers that can accurately measure temperature is relatively high, and the temperature range and accuracy of cheap thermometers are relatively poor. Another method is to set a weighing sensor on the pot support to control the firepower according to the change of the mass in the pot. However, it is difficult to set a weighing sensor on the pot support. The working environment of the pot support is harsh, and the temperature is often around 500°C, so the weighing sensor is difficult to use. Therefore, the prior art needs to be further improved. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a pot overflow detection method for the above-mentioned prior art, which is simple and easy to implement and can accurately detect the pot overflow state of a non-planar pot cover.

[0005] The second technical problem to be solved by the present invention is to provide a smoke-cooker linkage control device with a simple and easy implementation method and capable of accurately detecting the overflow state of a non-planar pot cover in view of the above-mentioned prior art.

[0006] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a pot overflow detection method, which is used to detect the pot overflow state of a non-planar pot cover, and is characterized in that: four distance measuring sensors are arranged just above the gas stove burner, and the installation method of the four distance measuring sensors satisfies the following three conditions at the same time: ①, the four distance measuring sensors can emit signals downward perpendicular to the horizontal plane of the stove when working; ②, the four distance measuring sensors can irradiate the outer surface of the pot cover; ③, the four points on the outer surface of the pot cover irradiated by the four distance measuring sensors are not in the same plane; when the pot is covered with a pot cover, the distances measured by the four distance measuring sensors are first used to calculate the equivalent spherical center coordinates of the non-planar pot cover in the initial state, and then the equivalent spherical center coordinates R of the non-planar pot cover in the initial state and the initial time T are saved in advance; in the subsequent cooking process, at each preset time interval △t, the equivalent spherical center coordinates R of the non-planar pot cover at the current moment are recalculated based on the distances measured by the four distance measuring sensors i , then according to R and R i , calculate the displacement of the equivalent sphere center ΔS i If the equivalent spherical center displacement is greater than or equal to the preset overflow threshold, it is determined that overflow occurs at the current moment.

[0007] As an improvement, let the equivalent sphere center coordinates R of the non-planar pot cover in the initial state be (x, y, z), and R i is (x i ,y i ,z i ), then the displacement of the equivalent sphere center is ΔS i The calculation formula is:

[0008]

[0009] Equivalent spherical center coordinates R i The calculation method is:

[0010] Establish an absolute coordinate system. After the installation positions of the four distance sensors are determined, the x and y coordinates of the four points on the pot cover illuminated by the four distance sensors are known. The Z-axis coordinate is measured by locking the distance sensors and is also known. Therefore, the coordinates of the four points on the outer surface of the pot cover illuminated by the four distance sensors are all known; let the coordinates of the four points on the outer surface of the pot cover illuminated by the four distance sensors be P1 = (x1, y1, z1), P2 = (x2, y2, z2), P3 = (x3, y3, z3) and P4 = (x4, y4, z4); let the coordinates of the equivalent sphere be R i =(x i ,y i ,x i ), assuming that the distances from the above four points to the center of the equivalent sphere are equal and are r, the equation is:

[0011]

[0012] Expand and eliminate the variables to get the following equations:

[0013]

[0014] make

[0015] a 11 =x1-x2

[0016] a 12 =y1-y2

[0017] a 13 =z1-z2

[0018] a 21 =x3-x4

[0019] a 22 =y3-y4

[0020] a 23 =z3-z4

[0021] a 31 =x2-x3

[0022] a 32 =y2-y3

[0023] a 33 =z2-z3

[0024]

[0025]

[0026] Column Matrix

[0027]

[0028] Use the following formula to calculate the equivalent spherical center coordinate R i =(x i ,y i ,z i )

[0029]

[0030] where det(A) represents the determinant of the matrix A, det(A x ) represents the matrix A x The determinant of det(A y ) represents the matrix A y The determinant of det(A z ) represents the matrix A z The determinant of .

[0031] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a smoke stove linkage control device is used to linkage control the matching stove and range hood, and is characterized in that: the above-mentioned overflow detection method is used to judge whether the pot set on the stove is overflowing.

[0032] As an improvement, four ranging sensors are installed on the range hood, and an air intake throttle valve module is provided on the stove that is matched with the range hood. The range hood and stove linkage control device sends instructions to the air intake throttle valve module according to the overflow status of the pot to execute different air intake modes.

[0033] If the equivalent spherical center displacement ΔS i When the displacement is less than the preset allowable error value S1, after the preset time △t, the equivalent sphere center displacement at the next moment is calculated; if the equivalent sphere center displacement ΔS i If the value is greater than or equal to the preset allowable error value S1 and less than the preset overflow threshold value S2, S2>S1, it is determined whether the air intake throttle valve module is in a fully closed state. If the air intake throttle valve module is not in a fully closed state, the air intake cross-sectional area of ​​the air intake throttle module is controlled to decrease by ΔM. After the preset time △t, the equivalent spherical center displacement ΔS at the next moment is calculated. i , if the equivalent sphere center displacement ΔS calculated at the next moment i If the value is greater than or equal to the preset allowable error value S1 and less than the preset overflow threshold value S2, the air inlet cross-sectional area of ​​the air intake throttling module is controlled to be further reduced by ΔM until the air intake throttling valve module is in a fully closed state, and at the same time, it is detected whether the range hood is turned on. If the range hood is not turned on, the range hood is controlled to be turned on automatically; if the equivalent spherical center displacement Δ· i If the value is greater than or equal to the preset overflow threshold value X2, the air intake throttling module is controlled to a fully closed state, and at the same time, it is detected whether the range hood is turned on. If the range hood is not turned on, the range hood is controlled to turn on automatically.

[0034] Compared with the prior art, the advantages of the present invention are: by measuring the distances of four non-coplanar points on the surface of the pot cover through four distance measuring sensors, the movement of the pot cover can be accurately calculated, and the overflow state of the pot can be inferred, and the implementation method is simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of a smoke-cooker linkage control device used in the pot overflow detection method in an embodiment of the present invention.

[0036] Figure 2 It is a flow chart of the control method of the smoke stove linkage control device in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below with reference to the accompanying drawings.

[0038] The present embodiment first provides an overflow detection method for detecting the overflow state of a non-planar pot cover, and is particularly effective for detecting whether a pot cover with a partially spherical surface has overflowed. Regardless of whether the pot cover is part of a sphere, in the present embodiment, all non-planar pot covers are regarded as similar to pot covers with a partially spherical surface; then, the equivalent spherical center coordinates of the non-planar pot cover are calculated, and the displacement of the equivalent spherical center coordinates is used to characterize the displacement of the non-planar pot cover. The overflow detection method in this embodiment requires that four distance measuring sensors be arranged on the range hood 10 directly above the burner of the gas stove 20, and the installation method of the four distance measuring sensors satisfies the following three conditions at the same time: ①, the four distance measuring sensors can all transmit signals downward perpendicular to the horizontal plane of the stove when working; ②, the four distance measuring sensors can all irradiate the outer surface of the pot cover; ③, the four points 1, 2, 3, and 4 on the outer surface of the pot cover irradiated by the four distance measuring sensors are not in the same plane; when the pot 30 is covered with a pot cover 40, the distances measured by the four distance measuring sensors are first used to calculate the equivalent spherical center coordinates R (S, y, z) of the non-planar pot cover 40 in the initial state, and then the equivalent spherical center coordinates R (x, y, z) of the non-planar pot cover in the initial state and the initial time T are saved in advance; in the subsequent cooking process, at each preset time interval △t, the equivalent spherical center coordinates R of the non-planar pot cover at the current moment are recalculated based on the distances measured by the four distance measuring sensors. i (x i ,y i ,z i ), then according to R(x,y,z) and R i (x i ,y i ,z i ), calculate the displacement of the equivalent sphere center If the equivalent spherical center displacement ΔS i If it is greater than or equal to the preset overflow threshold, it is determined that overflow occurs at the current moment.

[0039] The equivalent spherical center coordinates R(x, y, z) of the pot cover in the initial state and the equivalent spherical center coordinates R(x, y, z) at other times i The calculation method is the same as that of the equivalent sphere center coordinates R at other times i The calculation method is:

[0040] An absolute coordinate system is established on the range hood 10. After the installation positions of the four distance sensors are determined, the x and y coordinates of the four points on the pot cover illuminated by the four distance sensors are known. The Z-axis coordinate is measured by the four distance sensors and is also known. Therefore, the coordinates of the four points on the outer surface of the pot cover illuminated by the four distance sensors are all known. Let the coordinates of the four points on the outer surface of the pot cover illuminated by the four distance sensors be P1 = (x1, y1, z1), P2 = (x2, y2, z2), P3 = (x3, y3, z3) and P4 = (x4, y4, z4) respectively; let the coordinates of the equivalent sphere be R i =(x i ,y i ,z i ), assuming that the distances from the above four points to the center of the equivalent sphere are equal and are r, the equation is:

[0041]

[0042] Expand and eliminate the variables to get the following equations:

[0043]

[0044] make

[0045] a 11 =x1-x2

[0046] a 12 =y1-y2

[0047] a 13 =z1-z2

[0048] a 21 =x3-x4

[0049] a 22 =y3-y4

[0050] a 23 =z3-z4

[0051] a 31 =x2-x3

[0052] a 32 =y2-y3

[0053] a 33 =z2-z3

[0054]

[0055] Column Matrix

[0056]

[0057] Use the following formula to calculate the equivalent spherical center coordinate Ri =(x i ,y i ,z i )

[0058]

[0059] where det(A) represents the determinant of the matrix A, det(A x ) represents the matrix A x The determinant of det(A y ) represents the matrix A y The determinant of det(A z ) represents the matrix A z The determinant of .

[0060] The embodiment of the present invention further provides a smoke stove linkage control device for linkage control of a matching stove and a range hood, wherein four distance measuring sensors are arranged on the range hood 10, and an air intake throttle valve module (not shown in the figure) is arranged on the stove 20 matched with the range hood. Figure 1 As shown, the smoke stove linkage control device detects the overflow state according to the above overflow detection method, and then sends instructions to the intake throttle valve module to execute different intake modes. Figure 2 As shown: when the smoke stove linkage control device starts the anti-overflow function, it first determines whether the pot is covered with a lid. The determination method is that the distance value measured by the four distance measuring sensors is greater than the vertical distance between the top port of the pot and the corresponding distance measuring sensor, which means that the pot is not covered with a lid. If the pot is not covered with a lid, it is proposed to cover the pot. If the pot is already covered with a lid, the equivalent spherical center coordinate R of the non-planar pot cover in the initial state without overflowing is calculated, and then the equivalent spherical center coordinate R of the non-planar pot cover in the initial state and the initial time T are transmitted to the controller of the smoke stove linkage control device for advance storage; then in the subsequent cooking process, at each preset time interval △t, the equivalent spherical center coordinate R of the non-planar pot cover at the current moment is recalculated based on the distance measured by the four distance measuring sensors. i , according to R and R i , calculate the displacement of the equivalent sphere center ΔS i , if the equivalent spherical center displacement ΔS i When the displacement is less than the preset allowable error value S1, after the preset time △t, the equivalent sphere center displacement at the next moment is calculated; if the equivalent sphere center displacement ΔS iIf the value is greater than or equal to the preset allowable error value S1 and less than the preset overflow threshold value S2, S2>S1, it is determined whether the air intake throttle valve module is in a fully closed state. If the air intake throttle valve module is not in a fully closed state, the air intake cross-sectional area of ​​the air intake throttle module is controlled to decrease by Δm. At the same time, it is detected whether the range hood is turned on. If the range hood is not turned on, the range hood is controlled to turn on automatically. Then, after the preset time △t, the equivalent spherical center displacement ΔS at the next moment is calculated. i , if the equivalent sphere center displacement ΔS calculated at the next moment i If the value is greater than or equal to the preset allowable error value S1 and less than the preset overflow threshold value S2, the air inlet cross-sectional area of ​​the air intake throttling module is controlled to be further reduced by ΔM until the air intake throttling valve module is in a fully closed state; if the equivalent spherical center displacement ΔS calculated at the next moment is i If the value is greater than or equal to the preset overflow threshold S2, the air intake throttling module is controlled to be fully closed, and at the same time, it is detected whether the range hood is turned on. If the range hood is not turned on, the range hood is controlled to turn on automatically.

Claims

1. A pot overflow detection method for detecting the pot overflow state of a non-planar pot cover, characterized in that: Four distance measuring sensors are arranged directly above the gas stove burner, and the installation method of the four distance measuring sensors satisfies the following three conditions at the same time: ①, the four distance measuring sensors can transmit signals downward perpendicular to the horizontal plane of the stove when working; ②, the four distance measuring sensors can irradiate the outer surface of the pot cover; ③, the four points on the outer surface of the pot cover irradiated by the four distance measuring sensors are not in the same plane; when the pot is covered with a pot cover, the distances measured by the four distance measuring sensors are first used to calculate the equivalent spherical center coordinates of the non-planar pot cover in the initial state, and then the equivalent spherical center coordinates R and the initial time T of the non-planar pot cover in the initial state are saved in advance; in the subsequent cooking process, at each preset time interval △t, the equivalent spherical center coordinates R of the non-planar pot cover at the current moment are recalculated based on the distances measured by the four distance measuring sensors i , then according to R and R i , calculate the displacement of the equivalent sphere center ΔS i If the equivalent spherical center displacement is greater than or equal to the preset overflow threshold, it is determined that overflow occurs at the current moment.

2. The overflow detection method according to claim 1, characterized in that: Let the coordinates of the equivalent sphere center R of the non-planar pot cover in the initial state be (x, y, z), and let R i is (x i ,y i ,z i ), then the displacement of the equivalent sphere center is ΔS i The calculation formula is:

3. The overflow detection method according to claim 1, characterized in that: Equivalent spherical center coordinates R i The calculation method is: Establish an absolute coordinate system. After the installation positions of the four distance sensors are determined, the x and y coordinates of the four points on the pot cover illuminated by the four distance sensors are known. The Z-axis coordinate is measured by locking the distance sensors and is also known. Therefore, the coordinates of the four points on the outer surface of the pot cover illuminated by the four distance sensors are all known; let the coordinates of the four points on the outer surface of the pot cover illuminated by the four distance sensors be P1 = (x1, y1, z1), P2 = (x2, y2, z2), P3 = (x3, y3, z3) and P4 = (x4, y4, z4); let the coordinates of the equivalent sphere be R i =(x i ,y i ,z i ), assuming that the distances from the above four points to the center of the equivalent sphere are equal and are r, the equation is: Expand and eliminate the variables to get the following equations: make a 11 =x1-x2 a 12 =y1-y2 a 13 =z1-z2 a 21 =x3-x4 a 22 =y3-y4 a 23 =z3-z4 a 31 =x2-x3 <h2 style=";text-align:left;direction:ltr">a<h2 style=";text-align:left;direction:ltr"> 32 <h2 style=";text-align:left;direction:ltr"> =y2-y3 and 33 =z2-z3 Column Matrix Use the following formula to calculate the equivalent spherical center coordinate R i =(x i ,y i ,z i ) where det(A) represents the determinant of the matrix A, det(A x ) represents the matrix A x The determinant of det(A y ) represents the matrix A y The determinant of det(A z ) represents the matrix A z The determinant of .

4. A smoke stove linkage control device, used for linkage control of a matching stove and a range hood, characterized in that: The overflow detection method as claimed in claim 1, 2 or 3 is used to judge whether the pot arranged on the cooker is overflowing.

5. The smoke stove linkage control device according to claim 4, characterized in that: Four distance measuring sensors are arranged on the range hood, and an air intake throttle valve module is arranged on the stove matched with the range hood. The range hood and stove linkage control device sends instructions to the air intake throttle valve module according to the overflow state of the pot to execute different air intake modes.

6. The smoke stove linkage control device according to claim 5, characterized in that: If the equivalent spherical center displacement ΔS i When the displacement is less than the preset allowable error value S1, after the preset time △t, the equivalent sphere center displacement at the next moment is calculated; if the equivalent sphere center displacement ΔS i If the value is greater than or equal to the preset allowable error value S1 and less than the preset overflow threshold value S2, S2>S1, it is determined whether the air intake throttle valve module is in a fully closed state. If the air intake throttle valve module is not in a fully closed state, the air intake cross-sectional area of ​​the air intake throttle module is controlled to decrease by ΔM. After the preset time △t, the equivalent spherical center displacement ΔS at the next moment is calculated. i , if the equivalent sphere center displacement ΔS calculated at the next moment i If the value is greater than or equal to the preset allowable error value S1 and less than the preset overflow threshold value S2, the air inlet cross-sectional area of ​​the air intake throttling module is controlled to be further reduced by ΔM until the air intake throttling valve module is in a fully closed state, and at the same time, the range hood is detected to be turned on. If the range hood is not turned on, the range hood is controlled to be turned on automatically; if the equivalent spherical center displacement ΔS calculated at the next moment is i If the value is greater than or equal to the preset overflow threshold S2, the air intake throttling module is controlled to be fully closed, and at the same time, it is detected whether the range hood is turned on. If the range hood is not turned on, the range hood is controlled to turn on automatically.

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