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 and stove linkage control device for detecting the pot overflow state of a flat pot cover. The method is characterized in that three distance measuring sensors are arranged directly above the gas stove burner, emitting signals vertically downward, with the three illumination points on the pot cover not being on the same straight line. When the pot is covered with a pot cover, the plane normal vector #imgabs0# of the flat pot cover in its initial state is first calculated. During the subsequent cooking process, the plane normal vector #imgabs1# of the flat pot cover at the current moment is recalculated. Then, based on #imgabs2# and #imgabs3#, the maximum pot overflow angle θ of the pot cover is calculated. i , if the maximum overflow angle θ i If the overflow angle is greater than or equal to the preset overflow angle threshold, it is determined that the overflow phenomenon occurs at the current moment. Compared with the existing technology, the advantages of the present invention are: the distance between three non-collinear points on the surface of the pot cover is measured by three distance measuring sensors, and the maximum overflow angle θ of the pot cover is accurately calculated. i , inferring the overflow state of the pot, 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 have become commonplace in households, overflowing is a common occurrence for cooking methods like steaming, boiling, and stewing, which require large amounts of water. This overflow not only contaminates the stove's burner, blocks the flame holes, reduces combustion efficiency, and makes cleaning difficult, but also can extinguish the burner flame. If the thermocouple fails, it can cause a dangerous gas leak.

[0003] Prior art solutions measure the temperature of the pot's sidewalls and use changes in the pot's temperature pattern to control the stove's heat or temperature, thereby preventing overflow. However, detecting overflow based on temperature pattern changes has limitations. Wind blowing against the pot's sidewalls or water splashing onto the pot's sidewalls can also cause the temperature pattern to change, leading to misjudgments. Furthermore, thermometers that can accurately measure temperature are expensive, and inexpensive thermometers have limited measurement range and accuracy. Another approach involves attaching a load cell to the pot support to control the heat based on changes in the pot's mass. However, implementing a load cell on the pot support is difficult, as the pot support operates in a harsh environment, often at temperatures around 500°C, making it difficult to apply a load cell. Therefore, further improvements are needed in this existing technology. 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 flat pot cover.

[0005] The second technical problem to be solved by the present invention is to provide a smoke-stove linkage control device with a simple and easy implementation method and the ability to accurately detect the overflow state of a flat pot cover in response to the above-mentioned prior art.

[0006] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a pot overflow detection method for detecting the overflow state of a flat pot cover, characterized in that: three distance measuring sensors are arranged directly above the gas stove burner, and the installation method of the three distance measuring sensors simultaneously meets the following three conditions: ①, the three distance measuring sensors can all transmit signals downward perpendicular to the horizontal surface of the stove when working; ②, the three distance measuring sensors can all illuminate the outer surface of the pot cover; ③, the three points on the outer surface of the pot cover illuminated by the three distance measuring sensors are not on the same straight line; when the pot is covered with the pot cover, the distances measured by the three distance measuring sensors are first used to calculate the initial plane normal vector of the flat pot cover in the non-overflowing state. During the subsequent cooking process, at every preset time interval △t, the plane normal vector of the flat pot lid at the current moment is recalculated based on the distance measured by the three distance measuring sensors: Then according to and Calculate the maximum tilt angle of the flat pot cover at the current moment and set the maximum tilt angle as the maximum overflow angle θ i , if the maximum overflow angle θ i If the overflow angle is greater than or equal to the preset overflow angle threshold, it is determined that overflow occurs at the current moment.

[0007] As an improvement, the maximum overflow angle θ i Calculated by the following formula:

[0008]

[0009] in is the initial plane normal vector The model, is the plane normal vector Model.

[0010] Initial plane normal vector Obtained by the following formula:

[0011]

[0012] Among them, P 10 =(x 10 ,y 10 ,z 10 ), P 20 =(x 20 ,y 20 ,z 20 ), P 30 =(x 30 ,y 30 ,z 30 ) represents the initial coordinates of three points on the outer surface of the flat pot cover illuminated by the three ranging sensors when the pot is not overflowing;

[0013] Assume that during the cooking process, the plane normal vector at time i is Obtained by the following formula:

[0014]

[0015] Among them, P 1i =(x 1i ,y 1i ,z 1i ), P 2i =(x 2i ,y 2i ,z 2i ), P3i =(x 3i ,y 3i ,z 3i ) represents the coordinates of three points on the outer surface of the flat pot cover illuminated by the three ranging sensors at time i during the cooking process.

[0016] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a smoke stove linkage control device for linkage control of the matching stove and range hood, characterized in that: the above-mentioned overflow detection method is used to judge whether the pot set on the stove is overflowing.

[0017] As an improvement, three 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.

[0018] If the maximum overflow angle θ i Less than the preset allowable error value θ a When the preset time △t passes, continue to calculate the maximum overflow angle θ at the next moment i ; If the maximum overflow angle θ i Greater than or equal to the preset allowable error value θ a Less than the preset overflow angle threshold θ b ,θ b >θ a , judge whether the intake throttle valve module is in a fully closed state. If the intake throttle valve module is not in a fully closed state, the intake cross-sectional area of the intake throttle module is controlled to decrease by ΔM. After the preset time △t, the maximum overflow angle θ at the next moment is calculated. i , if the maximum overflow angle θ calculated at the next moment is i Greater than or equal to the preset allowable error value θ a Less than the preset overflow angle threshold θ b , then the air inlet cross-sectional area of the air intake throttling module is controlled to decrease 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 turn on automatically; if the maximum overflow angle θ calculated at the next moment i Greater than or equal to the preset overflow angle threshold θ b , then control the air intake throttling module to the fully closed state, and at the same time detect whether the range hood is turned on. If the range hood is not turned on, control the range hood to turn on automatically.

[0019] Compared with the prior art, the advantages of the present invention are: the distances between three non-collinear points on the flat pot cover surface are measured by three distance measuring sensors, and the maximum overflow angle θ of the pot cover is accurately calculated. i , inferring the overflow state of the pot, and the implementation method is simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the smoke-stove linkage control device used in the pot overflow detection method in an embodiment of the present invention.

[0021] Figure 2 This is a flow chart of the control method of the smoke-stove linkage control device in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0023] This embodiment first provides a pot overflow detection method for detecting the overflow state of a flat pot cover. Three distance measuring sensors need to be installed on the range hood 10 directly above the burner of the gas stove 20. The installation method of the three distance measuring sensors simultaneously meets the following three conditions: ①, the three distance measuring sensors can all transmit signals downward perpendicular to the horizontal surface of the stove when working; ②, the three distance measuring sensors can all illuminate the outer surface of the pot cover; ③, the three points 1, 2, and 3 on the outer surface of the pot cover illuminated by the three distance measuring sensors are not on the same straight line; when the pot 30 is covered with the pot cover 40, the distances measured by the three distance measuring sensors are first used to calculate the initial plane normal vector of the flat pot cover in the non-overflow state. During the subsequent cooking process, at every preset time interval △t, the plane normal vector of the flat pot lid at the current moment is recalculated based on the distance measured by the three distance measuring sensors: Then according to and Calculate the maximum tilt angle of the flat pot cover at the current moment and set the maximum tilt angle as the maximum overflow angle θ i , if the maximum overflow angle θ i If the overflow angle is greater than or equal to the preset overflow angle threshold, it is determined that overflow occurs at the current moment.

[0024] Maximum overflow angle θ i Calculated by the following formula:

[0025]

[0026] in is the initial plane normal vector The model, is the plane normal vector Model.

[0027] An absolute coordinate system is established on the range hood 10. Three distance sensors are installed on the range hood, so the x and y coordinates of the three irradiation points 1, 2, and 3 on the pot lid are known. The Z axis coordinate is measured by the distance sensor and is also known, so the coordinates of the three irradiation points 1, 2, and 3 can be obtained. Obtained by the following formula:

[0028]

[0029] Among them, P 10 =(x 10 ,y 10 ,z 10 ), P 20 =(x 20 ,y 20 ,z 20 ), P 30 =(x 30 ,y 30 ,z 30 ) represents the initial coordinates of three points on the outer surface of the flat pot cover illuminated by the three ranging sensors when the pot is not overflowing;

[0030] Assume that during the cooking process, the plane normal vector at time i is Obtained by the following formula:

[0031]

[0032] Among them, P 1i =(x 1i ,y 1i ,z 1i ), P 2i =(x 2i ,y 2i ,z 2i ), P 3i =(x 3i ,y 3i ,z 3i ) represents the coordinates of three points on the outer surface of the flat pot cover illuminated by the three ranging sensors at time i during the cooking process.

[0033] 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. Three 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 2As 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 judgment method is that if 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, it 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 initial plane normal vector of the plane pot lid in the non-overflow state is calculated. During the subsequent cooking process, at every preset time interval △t, the plane normal vector of the flat pot lid at the current moment is recalculated based on the distance measured by the three distance measuring sensors: Then according to and Calculate the maximum tilt angle of the flat pot cover at the current moment and set the maximum tilt angle as the maximum overflow angle θ i , if the maximum overflow angle θ i Less than the preset allowable error value θ a After the preset time △t, continue to calculate the maximum overflow angle θ at the next moment i ; If the maximum overflow angle θ i Greater than or equal to the preset allowable error value θ a Less than the preset overflow angle threshold θ b ,θ b >θ a , judge 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, control the air intake cross-sectional area of the air intake throttle module to decrease by ΔM. At the same time, detect whether the range hood is turned on. If the range hood is not turned on, control the range hood to turn on automatically. Then, after the preset time △t, continue to calculate the maximum overflow angle θ at the next moment i , if the maximum overflow angle θ calculated at the next moment is i Greater than or equal to the preset allowable error value θ a Less than the preset overflow angle threshold θ b , then the air inlet cross-sectional area of the control intake throttle module is further reduced by ΔM until the intake throttle valve module is in a fully closed state; if the maximum overflow angle θ calculated at the next moment is i Greater than or equal to the preset overflow angle threshold θ b , then control the air intake throttling module to the fully closed state, and at the same time detect whether the range hood is turned on. If the range hood is not turned on, control the range hood to turn on automatically.

Claims

1. A method for detecting an overflowing pot, for detecting an overflowing pot state of a flat pot cover, characterized by: Three distance measuring sensors are set up directly above the gas stove burner. The installation method of the three distance measuring sensors meets the following three conditions at the same time: ①, when working, the three distance measuring sensors can transmit signals perpendicular to the horizontal surface of the stove downward; ②, the three distance measuring sensors can illuminate the outer surface of the pot lid; ③, the three points on the outer surface of the pot lid illuminated by the three distance measuring sensors are not on the same straight line; when the pot is covered with a pot lid, the distance measured by the three distance measuring sensors is first used to calculate the initial plane normal vector of the flat pot lid when it is not overflowing. During the subsequent cooking process, at every preset time interval △t, the plane normal vector of the flat pot lid at the current moment is recalculated based on the distance measured by the three distance measuring sensors: Then according to and Calculate the maximum tilt angle of the flat pot cover at the current moment and set the maximum tilt angle as the maximum overflow angle θ i , if the maximum overflow angle θ i If the overflow angle is greater than or equal to the preset overflow angle threshold, it is determined that overflow occurs at the current moment.

2. The overflow detection method according to claim 1, wherein: Maximum overflow angle θ i Calculated by the following formula: in is the initial plane normal vector The model, is the plane normal vector Model.

3. The overflow detection method according to claim 1, wherein: Initial plane normal vector Obtained by the following formula: Among them, P 10 =(x 10 ,y 10 ,z 10 ), P 20 =(x 20 ,y 20 ,z 20 ), P 30 =(x 30 ,y 30 ,z 30 ) represents the initial coordinates of three points on the outer surface of the flat pot cover illuminated by the three ranging sensors when the pot is not overflowing; Assume that during the cooking process, the plane normal vector at time i is Obtained by the following formula: Among them, P 1i =(x 1i ,y 1i ,z 1i ), P 2i =(x 2i ,y 2i ,z 2i ), P 3i =(x 3i ,y 3i ,z 3i ) represents the coordinates of three points on the outer surface of the flat pot cover illuminated by the three ranging sensors at time i during the cooking process.

4. A smoke stove linkage control device for linkage control of a stove and a range hood, characterized by: The pot overflow detection method as described in claim 1, 2 or 3 is used to determine whether the pot set on the stove is overflowing; three ranging sensors are set on the range hood, and the stove equipped with the range hood is provided with an air intake throttle valve module. The range hood and stove linkage control device sends instructions to the air intake throttle valve module according to the pot overflow status to execute different air intake modes.

5. The smoke and stove linkage control device according to claim 4, characterized in that: If the maximum overflow angle θ i Less than the preset allowable error value θ a After the preset time △t, continue to calculate the maximum overflow angle θ at the next moment i ; If the maximum overflow angle θ i Greater than or equal to the preset allowable error value θ a Less than the preset overflow angle threshold θ b ,θ b >θ a , judge whether the intake throttle valve module is in a fully closed state. If the intake throttle valve module is not in a fully closed state, the intake cross-sectional area of the intake throttle module is controlled to decrease by ΔM. After the preset time △t, the maximum overflow angle θ at the next moment is calculated. i , if the maximum overflow angle θ calculated at the next moment is i Greater than or equal to the preset allowable error value θ a Less than the preset overflow angle threshold θ b , then the air inlet cross-sectional area of the air intake throttling module is controlled to decrease 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 turn on automatically; if the maximum overflow angle θ calculated at the next moment i Greater than or equal to the preset overflow angle threshold θ b , then control the air intake throttling module to the fully closed state, and at the same time detect whether the range hood is turned on. If the range hood is not turned on, control the range hood to turn on automatically.

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