Partition heating cooking appliance holding control method, cooking appliance and storage medium

Abstract

The present application relates to the technical field of cooking utensil temperature control, and particularly relates to a partition heating cooking utensil temperature control method, a cooking utensil and a storage medium, wherein the method comprises: obtaining bottom temperature detection information and top temperature detection information; determining a bottom temperature change trend according to the bottom temperature detection information and determining a top temperature change trend according to the top temperature detection information, so as to control a first power of a first heating element and a second power of a second heating element of a cooking cavity, so that the bottom temperature and the top temperature of the cooking cavity are both within a target temperature range. The heating positions of the first heating element and the second heating element are different, and the effects on the region temperature of the cooking cavity are different, so that the effect of partition heating is achieved. The bottom temperature change trend and the top temperature change trend are determined, and then the first heating element and the second heating element are controlled, so that the bottom temperature and the top temperature of the cooking cavity are within the target temperature range, and the effect of making the temperature in the cooking cavity more uniform and stable is achieved.

Description

Technical Field

[0001] This invention relates to the field of temperature control technology for cooking appliances, and more particularly to a method for heat preservation control of zoned heating cooking appliances, cooking appliances, and storage media. Background Technology

[0002] In existing technologies, cooking appliances, such as rice cookers, use a single heating element for heating. However, using a single heating element has significant limitations. Because the heating element is located on one side of the cooking container, heat is conducted from a fixed location, leading to significant temperature differences in different parts of the container. This can result in some areas being overheated or underheated. During heat conduction, the fixed location of the heat source and uneven heat diffusion ultimately affect the overall heating of the food. Especially during the heat preservation process, prolonged uneven temperature distribution can lead to poor cooking results and unpleasant food texture. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in related technologies. To this end, this invention proposes a method for heat preservation control of zoned heating cooking appliances, which makes the temperature inside the cooking cavity more uniform and stable during heat preservation.

[0004] The present invention also proposes cooking utensils and storage media.

[0005] According to a first aspect of the present invention, a heat preservation control method for a zoned heating cooking appliance includes a first heating element and a second heating element, both used for heating food within the cooking cavity, in the partitioned heating plate of the cooking appliance. The method includes: Obtain bottom temperature detection information and top temperature detection information, wherein the bottom temperature detection information represents the bottom temperature of the cooking cavity and the top temperature detection information represents the top temperature of the cooking cavity; The bottom temperature change trend is determined based on the bottom temperature detection information, and the top temperature change trend is determined based on the top temperature detection information. Based on the bottom temperature change trend and the top temperature change trend, the first power of the first heating element and the second power of the second heating element in the cooking cavity are controlled so that the bottom temperature and the top temperature of the cooking cavity are both within the target temperature range.

[0006] The heat preservation control method for a zoned heating cooking appliance according to an embodiment of the present invention has at least the following beneficial effects: Based on bottom temperature detection information and top temperature detection information, the bottom temperature and top temperature of the cooking cavity can be determined, thereby revealing the temperature distribution within the cooking cavity. When the first heating element and the second heating element heat the same cooking cavity, their different heating positions result in different effects on the regional temperature of the cooking cavity, achieving a zoned heating effect. By determining the bottom temperature change trend and the top temperature change trend, the first and second heating elements can be controlled. Utilizing the zoned heating effect of the first and second heating elements, the bottom temperature and top temperature of the cooking cavity are kept within the target temperature range, resulting in a more uniform and stable temperature within the cooking cavity, which is beneficial for improving the heat preservation effect during cooking.

[0007] According to one embodiment of the present invention, before determining the bottom temperature change trend based on the bottom temperature detection information and determining the top temperature change trend based on the top temperature detection information, the method further includes: Based on the bottom temperature detection information and the heat preservation time, the working mode is determined. The working mode includes a cooling mode in the early stage of the heat preservation stage and a heat preservation maintenance mode after the cooling mode. If the working mode is determined to be cooling mode, then the first heating element and the second heating element are controlled to stop heating; If the working mode is determined to be the heat preservation mode, then the steps of determining the bottom temperature change trend based on the bottom temperature detection information and determining the top temperature change trend based on the top temperature detection information are executed.

[0008] According to an embodiment of the present invention, determining the bottom temperature change trend based on the bottom temperature detection information and determining the top temperature change trend based on the top temperature detection information includes: Based on the bottom temperature detection information, determine the maximum and minimum bottom temperature values ​​detected in the current cycle, and determine the bottom temperature change trend in the current cycle based on the maximum and minimum bottom temperature values. Based on the top temperature detection information, the maximum and minimum top temperatures detected in the current cycle are determined, and the top temperature change trend in the current cycle is determined based on the maximum and minimum top temperatures.

[0009] According to an embodiment of the present invention, controlling the first power of the first heating element and the second power of the second heating element of the cooking cavity based on the bottom temperature change trend and the top temperature change trend includes: Based on the bottom temperature change trend and the top temperature change trend, a combination of change trends is determined, wherein the combination of change trends has at least two possible combinations; Based on the combination of the changing trends and the corresponding preset adjustment conditions, an adjustment strategy is determined, wherein the preset adjustment conditions characterize the temperature conditions for power adjustment. According to the adjustment strategy, the first power of the first heating element and the second power of the second heating element are adjusted.

[0010] According to one embodiment of the present invention, the first heating element is an inner heating plate, the second heating element is an outer heating plate, the outer heating plate is annular, and the inner heating plate is located at the center of the outer heating plate; the step of determining the adjustment strategy based on the combination of the changing trends and the corresponding preset adjustment conditions includes: If the combination of the changing trends is determined to be an upward trend in both the bottom temperature change trend and the top temperature change trend, and if the first preset adjustment condition is met, then the adjustment strategy is to control both the first heating element and the second heating element to reduce the preset power value. If the combination of the changing trends is determined to be a combination of a decreasing trend in both the bottom temperature and the top temperature, and if the second preset adjustment condition is met, then the adjustment strategy is to control both the first heating element and the second heating element to increase the preset power value. If the combination of changing trends is determined to be an upward trend in the bottom temperature and a downward trend in the top temperature, and if the third preset adjustment condition is satisfied, then the adjustment strategy is to control the first heating element to reduce the preset power value and control the second heating element to increase the preset power value. The combination of changing trends is determined to be a decreasing trend in the bottom temperature and an increasing trend in the top temperature, and a fourth preset adjustment condition is determined to be met. The adjustment strategy is to control the first heating element to increase the preset power value and control the second heating element to decrease the preset power value.

[0011] According to an embodiment of the present invention, the first preset adjustment condition is that both the maximum bottom temperature and the maximum top temperature are greater than a first preset threshold. The second preset adjustment condition is that both the minimum bottom temperature and the minimum top temperature are less than the second preset threshold. The third preset adjustment condition is that the first difference between the bottom temperature value and the top temperature value at the same time is greater than the third preset threshold. The fourth preset adjustment condition is that the second difference between the top temperature value and the bottom temperature value at the same time is greater than the fourth preset threshold. Wherein, the maximum bottom temperature is determined by the maximum value in the bottom temperature array, the maximum top temperature is determined by the maximum value in the top temperature array, the minimum bottom temperature is determined by the minimum value in the bottom temperature array, and the minimum top temperature is determined by the minimum value in the top temperature array.

[0012] According to one embodiment of the present invention, it further includes: When in the heat preservation mode, if the heat preservation duration is determined to be greater than a preset time threshold, the heat preservation mode is exited.

[0013] According to a second aspect of the present invention, a cooking appliance includes a main body, the main body being provided with a control unit, a bottom temperature detection unit, a top temperature detection unit, a cooking cavity, and a first heating element and a second heating element, both used for heating the cooking cavity. The control unit is electrically connected to the bottom temperature detection unit, the top temperature detection unit, the first heating element, and the second heating element, respectively. The bottom temperature detection unit is used to detect the bottom temperature of the cooking cavity, the top temperature detection unit is used to detect the top temperature of the cooking cavity, and the control unit is used to execute the above-described zoned heating cooking appliance heat preservation control method.

[0014] The cooking appliance according to embodiments of the present invention has at least the following beneficial effects: a bottom temperature detection unit detects the bottom temperature of the cooking cavity and generates bottom temperature detection information; a top temperature detection unit detects the top temperature of the cooking cavity and generates top temperature detection information. The control unit determines the bottom and top temperatures of the cooking cavity based on the bottom and top temperature detection information, thereby obtaining the temperature distribution within the cooking cavity. The first and second heating elements heat the same cooking cavity. Because the first and second heating elements are located at different positions, their impact on the regional temperature of the cooking cavity differs, achieving a zoned heating effect. By determining the bottom and top temperature change trends, the control unit controls the first and second heating elements. Utilizing the zoned heating effect of the first and second heating elements, the bottom and top temperatures of the cooking cavity are kept within the target temperature range, resulting in a more uniform and stable temperature within the cooking cavity, which is beneficial for improving cooking performance.

[0015] According to one embodiment of the present invention, the first heating element is an inner heating plate, the second heating element is an outer heating plate, the outer heating plate is annular, the inner heating plate is located at the center of the outer heating plate, and the outer heating plate can float relative to the inner heating plate in directions closer to and farther from the cooking cavity.

[0016] According to a third aspect of the present invention, a non-transitory storage medium stores an executable program thereon, which, when executed by a processor, implements the above-described zoned heating cooking appliance heat preservation control method.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the heat preservation control method for zoned heating cooking appliances provided in an embodiment of the present invention.

[0020] Figure 2 This is a control flowchart of one embodiment of the heat preservation control method for zoned heating cooking appliances provided in this invention.

[0021] Figure 3 This is a schematic diagram of the structural frame of the cooking utensil provided in an embodiment of the present invention.

[0022] Figure 4 This is a cross-sectional schematic diagram of the cooking utensil provided in an embodiment of the present invention.

[0023] Figure 5 This is a top view schematic diagram of the cooking utensil provided in an embodiment of the present invention.

[0024] Figure label: 100: Main body; 101: Cooking cavity; 110: Control unit; 121: Bottom detection unit; 122: Top temperature detection unit; 200: First heating plate; 300: Second heating plate. Detailed Implementation

[0025] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0026] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0028] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0030] For the above situation, refer to Figure 1This invention provides a method for heat preservation control of a zoned heating cooking appliance, wherein the zoned heating plate of the cooking appliance includes a first heating element and a second heating element, both used for heating food within the cooking cavity, and the method includes: S100: Acquire bottom temperature detection information and top temperature detection information. The bottom temperature detection information represents the bottom temperature of the cooking cavity, and the top temperature detection information represents the top temperature of the cooking cavity. S200: Determine the bottom temperature change trend based on bottom temperature detection information, and determine the top temperature change trend based on top temperature detection information; S300: Based on the temperature change trends at the bottom and top, control the first power of the first heating element and the second power of the second heating element in the cooking cavity so that the bottom temperature and the top temperature of the cooking cavity are both within the target temperature range.

[0031] Based on the bottom and top temperature detection information, the bottom and top temperatures of the cooking cavity can be determined, thus revealing the temperature distribution within the cavity. The first and second heating elements heat the same cooking cavity; however, due to their different heating positions, their impact on the regional temperature areas differs, achieving a zoned heating effect. By determining the bottom and top temperature change trends, the first and second heating elements can be controlled. Utilizing their zoned heating effect, the bottom and top temperatures of the cooking cavity are kept within the target temperature range, resulting in a more uniform and stable temperature within the cavity, thus improving cooking heat retention.

[0032] When the first and second heating elements are heating, their different positions result in different temperature effects on different areas within the cooking cavity. For example... Figure 4 and Figure 5 As shown, in some embodiments of the present invention, the cooking appliance is a rice cooker. Inside the rice cooker, the first heating element 200 is an inner heating plate, and the second heating element 300 is an outer heating plate. The outer heating plate 300 is annular, and the inner heating plate 200 is located at the center of the annulus. The inner heating plate is in contact with the center of the bottom of the inner pot. When the inner heating plate is heating, heat is conducted from the central area of ​​the bottom of the inner pot to the surrounding area, affecting the temperature of the lower central area of ​​the inner pot more quickly. The outer heating plate is in contact with the outer ring of the bottom of the inner pot. When the outer heating plate is heating, heat can be transferred along the side wall of the inner pot. Since the heat conduction rate of the inner pot is much greater than the heat conduction efficiency of food, the outer heating plate affects the temperature of the side wall and top areas more quickly. Based on the difference in the temperature influence of the inner and outer heating plates on the cooking cavity, by controlling the inner and outer heating plates, i.e., the first heating element and the second heating element, the temperature of the cooking cavity can be made more uniform.

[0033] The above are merely illustrative examples. In some embodiments of the present invention, the first heating element and the second heating element may be, in addition to being an electric heating plate, also be heating tubes, electromagnetic heating coils, or other devices with heating functions.

[0034] In some embodiments of the present invention, the bottom temperature detection information and the top temperature detection information can be obtained by devices such as temperature sensors. By installing temperature sensors at the bottom and top of the cooking cavity, bottom temperature detection information and top temperature detection information are generated accordingly.

[0035] In some embodiments of the present invention, the target temperature range during heat preservation can be determined according to the cooking function, such as the rice cooking function, where the target temperature range during heat preservation is 70℃±1℃.

[0036] In some embodiments of the present invention, controlling the power adjustment of the first heating element and the second heating element can be achieved by adjusting the power adjustment ratio of the first heating element and the power adjustment ratio of the second heating element.

[0037] refer to Figure 2 In some embodiments of the heat preservation control method for zoned heating cooking appliances of the present invention, before S200, the method further includes: Based on the bottom temperature detection information and the heat preservation time, the working mode is determined. The working mode includes the cooling mode in the early stage of the heat preservation stage and the heat preservation maintenance mode after the cooling mode. If the working mode is determined to be cooling mode, then control the first heating element and the second heating element to stop heating; If the working mode is determined to be the heat preservation mode, then the steps of determining the bottom temperature change trend based on the bottom temperature detection information and determining the top temperature change trend based on the top temperature detection information are executed.

[0038] When cooking, cooking appliances can be set with different working modes to meet the needs of different cooking stages. Usually, when the food is heated to completion, the temperature is high and needs to be cooled down. At this time, there is no need to heat it. Heating is only required when the food temperature drops to the point where it needs to be kept warm. This cooking process can correspond to two working modes: cooling mode and heat preservation mode.

[0039] Based on the bottom temperature detection information, top temperature detection information, and heat preservation time, the working mode is determined. When in cooling mode, the first and second heating elements are stopped from heating, and it is determined whether the heat preservation conditions are met. If they are met, the mode is switched to heat preservation mode. When in heat preservation mode, the bottom temperature change trend and the top temperature change trend are determined, and then the first and second heating elements of the cooking cavity are controlled so that the bottom temperature and the top temperature of the cooking cavity are both within the target temperature range, thereby achieving the effect of maintaining a uniform and stable temperature in the cooking cavity.

[0040] refer to Figure 2 In some embodiments of the present invention, the operating mode is determined based on bottom temperature detection information, top temperature detection information, and heat preservation time. This can be achieved by determining a heat preservation mode when the bottom temperature of the cooking cavity is below a first temperature threshold or the heat preservation time reaches a first duration threshold; otherwise, a cooling mode is used. For example, a cooling mode is determined when the bottom temperature TBot of the cooking cavity is ≥68℃ and the heat preservation time T <4h; a heat preservation mode is determined when the bottom temperature TBot of the cooking cavity is <68℃ or the heat preservation time T ≥4h. In the cooling mode, the system switches to the heat preservation mode when the conditions TBot <68℃ or the heat preservation time T ≥4h are met. It is understood that the temperature at which some cooking functions complete heating is the temperature at which heat preservation is required; therefore, the system can directly enter the heat preservation mode without going through a cooling mode.

[0041] The heat preservation time refers to the duration after heating is completed, not the time spent in the heat preservation mode. It is understood that in some embodiments of the present invention, the operating mode may also include other operating modes such as the heating mode.

[0042] In addition to determining the working mode based on bottom temperature detection information and heat preservation time, in some embodiments of the present invention, the working mode can also be determined based on top temperature detection information and heat preservation time; or the working mode can be determined by combining bottom temperature detection information, top temperature detection information, and heat preservation time.

[0043] refer to Figure 2 In some embodiments of the heat preservation control method for zoned heating cooking appliances of the present invention, S200 includes: Based on the bottom temperature detection information, determine the maximum and minimum bottom temperature values ​​detected in the current cycle, and determine the bottom temperature change trend in the current cycle based on the maximum and minimum bottom temperature values. Based on the top temperature detection information, the maximum and minimum top temperatures detected in the current cycle are determined, and the top temperature change trend in the current cycle is determined based on the maximum and minimum top temperatures.

[0044] Based on the bottom and top temperature detection information, the maximum and minimum bottom temperatures, as well as the maximum and minimum top temperatures detected in the current cycle, are determined respectively. The bottom temperature change trend is determined based on the maximum and minimum bottom temperatures, and the top temperature change trend is determined based on the maximum and minimum top temperatures. In this way, the first power of the first heating element and the second power of the second heating element in the next cycle can be adjusted in advance based on the bottom and top temperature change trends in the current cycle, which helps to further reduce the temperature fluctuation range and improve the accuracy of temperature control.

[0045] In some embodiments of the present invention, temperature values ​​within a period can be recorded by constructing a top temperature array and a bottom temperature array, thereby determining the temperature change trend. Specifically, this may include: At preset intervals, such as 1 second, based on the bottom temperature detection information, the bottom temperature value of the cooking cavity is added to the bottom temperature array and the oldest recorded value is removed from the bottom temperature array. Based on the top temperature detection information, the top temperature value of the cooking cavity is added to the top temperature array and the oldest recorded value is removed from the top temperature array. At each preset interval, such as 1 minute, the bottom temperature change trend and the top temperature change trend are determined based on the bottom temperature array and the top temperature array.

[0046] By constructing bottom and top temperature arrays, the bottom and top temperatures of the cooking cavity are recorded in these arrays at preset intervals, ensuring they reflect recent temperature changes. When adding a new temperature value, the oldest recorded value is removed, guaranteeing that the arrays reflect the most recent temperature changes and preventing older values ​​from influencing subsequent temperature trend assessments, thus improving the accuracy of temperature trend prediction.

[0047] It is understandable that when constructing the bottom temperature array and the top temperature array, the initial bottom temperature array and the top temperature array contain the initial values. Subsequently, at each preset interval, the recorded temperature values ​​are loaded into the array, and the earliest value is removed accordingly when a temperature value is loaded. This can be the initial value, and the earliest recorded temperature value is removed after the array is full.

[0048] To facilitate understanding, let's illustrate with an example: Assume the bottom temperature array has a length of 3, allowing it to store three values. If initially set to [0,0,0], and the cooking cavity bottom temperature changes in the order of 70℃, 70.5℃, 70℃, and 69.5℃, then after adding the temperatures recorded in the first three cycles to the bottom temperature array, the historical temperature array becomes [70,70.5,70]. In the fourth cycle, the earliest recorded value (the first 70℃) is removed, and then 69.5℃ is stored, resulting in the historical temperature array [70.5, 70, 69.5]. This allows us to focus on the temperature changes within the most recent time period. Similarly, the top temperature array is updated in the same way. This is just an illustrative example; in practical applications, the array length can be set according to requirements, such as setting it to 60.

[0049] In some embodiments of the present invention, the array length is set according to the preset duration of the temperature acquisition interval and the preset period of the temperature trend determination interval. For example, if the preset period is 60 seconds and the preset duration is 1 second, the array length is 60, so that the temperature value stored in the array is the temperature value collected and recorded in the current period. Based on the maximum and minimum values ​​in the array, the maximum and minimum temperature values ​​can be determined, thereby facilitating the determination of the temperature change trend.

[0050] Based on the changes in the values ​​in the bottom temperature array, it can be determined whether the temperature change trend at the bottom of the cooking cavity is upward or downward. Similarly, based on the changes in the values ​​in the top temperature array, it can be determined whether the temperature change trend at the top of the cooking cavity is upward or downward. In some embodiments of the present invention, in addition to determining the temperature change trend based on the maximum and minimum values ​​in the arrays, i.e., the maximum and minimum temperatures, the slope can also be calculated by fitting curves based on the values ​​in the bottom and top temperature arrays to achieve the purpose of determining the temperature change trend.

[0051] refer to Figure 2 In some embodiments of the heat preservation control method for zoned heating cooking appliances of the present invention, S300 includes: Based on the temperature change trends at the bottom and top, a combination of trends is determined, wherein the combination of trends has at least two possible combinations. The adjustment strategy is determined based on the combination of changing trends and the corresponding preset adjustment conditions, wherein the preset adjustment conditions represent the temperature conditions for power adjustment. According to the adjustment strategy, the first power of the first heating element and the second power of the second heating element are adjusted.

[0052] Since the temperature changes at the bottom and top of the cooking cavity exhibit both upward and downward trends, there are four possible combinations: both bottom and top show upward trends; both bottom and top show downward trends; the bottom shows an upward trend and the top shows a downward trend; and the bottom shows a downward trend and the top shows an upward trend. Under different combinations of these trends, and in conjunction with corresponding preset adjustment conditions, an adjustment strategy is determined to control the first and second heating elements, adjusting their first and second power to ensure that the bottom and top temperatures of the cooking cavity remain within the target temperature range.

[0053] By combining the temperature change trends at the bottom and top, and considering all possible temperature conditions from a holistic perspective, the adjustment and control of the first and second heating elements can be improved, resulting in more precise power regulation.

[0054] refer to Figure 2 In some embodiments of the heat preservation control method for zoned heating cooking appliances of the present invention, the first heating element is an inner heating plate, the second heating element is an outer heating plate, the outer heating plate is annular, and the inner heating plate is located at the center of the outer heating plate; an adjustment strategy is determined based on the combination of changing trends and corresponding preset adjustment conditions, including: The combination of temperature changes is determined to be an upward trend in both the bottom and top temperatures, and the first preset adjustment condition is met. Therefore, the adjustment strategy is to reduce the preset power value of both the first and second heating elements.

[0055] In some embodiments, if it is determined that the combination of change trends is that both the bottom temperature change trend and the top temperature change trend are decreasing, and it is determined that the second preset adjustment condition is met, the adjustment strategy is to control both the first heating element and the second heating element to increase the preset power value.

[0056] Furthermore, in other embodiments, if it is determined that the combination of changing trends is that the bottom temperature changing trend is an upward trend and the top temperature changing trend is a downward trend, and it is determined that the third preset adjustment condition is met, the adjustment strategy is to control the first heating element to reduce the preset power value and control the second heating element to increase the preset power value.

[0057] In some other embodiments, if it is determined that the combination of changing trends is a decreasing trend in the bottom temperature and an increasing trend in the top temperature, and it is determined that the fourth preset adjustment condition is met, the adjustment strategy is to control the first heating element to increase the preset power value and control the second heating element to decrease the preset power value.

[0058] For different combinations of temperature change trends, after meeting the corresponding preset adjustment conditions, the power of the first heating element and the second heating element is adjusted accordingly as an adjustment strategy with the goal of suppressing the temperature change trend. Subsequently, the temperature change trend can be suppressed according to the adjustment strategy, so as to control the bottom temperature and top temperature of the cooking cavity within the target temperature range.

[0059] It should be noted that not all four combinations of changing trends necessarily have corresponding preset adjustment conditions and strategies. In some embodiments of the present invention, only one, two, three, or four combinations of changing trends may have corresponding adjustment conditions and strategies. In other words, in some embodiments, the changing trend combination and the preset adjustment condition may only have one, two, or three. For example, in one embodiment, determining the adjustment strategy based on the changing trend combination and the corresponding preset adjustment condition only includes: determining that the changing trend combination is that the bottom temperature changing trend is an upward trend and the top temperature changing trend is a downward trend, and determining that a third preset adjustment condition is met, and using the adjustment strategy of controlling the first heating element to reduce the preset power value and controlling the second heating element to increase the preset power value.

[0060] Alternatively, in some embodiments, determining the adjustment strategy based on the combination of changing trends and the corresponding preset adjustment conditions may only include: determining that the combination of changing trends is that the bottom temperature changing trend is decreasing and the top temperature changing trend is increasing, and determining that the fourth preset adjustment condition is met, and using the adjustment strategy of controlling the first heating element to increase the preset power value and controlling the second heating element to decrease the preset power value.

[0061] Alternatively, in some embodiments, the step of determining the adjustment strategy based on the combination of changing trends and the corresponding preset adjustment conditions may only include: determining that the combination of changing trends is that the bottom temperature changing trend is an upward trend and the top temperature changing trend is a downward trend, and determining that the third preset adjustment condition is met, and using the adjustment strategy of controlling the first heating element to reduce the preset power value and controlling the second heating element to increase the preset power value. The combination of changing trends is determined to be a decreasing trend in the bottom temperature and an increasing trend in the top temperature, and a fourth preset adjustment condition is determined to be met. The adjustment strategy is to control the first heating element to increase the preset power value and control the second heating element to decrease the preset power value.

[0062] refer to Figure 2 In some embodiments of the heat preservation control method for zoned heating cooking appliances of the present invention, The first preset adjustment condition is that the maximum value of the bottom temperature and the maximum value of the top temperature are both greater than the first preset threshold. The second preset adjustment condition is that both the minimum bottom temperature and the minimum top temperature are less than the second preset threshold. The third preset adjustment condition is that the first difference between the bottom temperature value and the top temperature value at the same time is greater than the third preset threshold. The fourth preset adjustment condition is that the second difference between the top temperature value and the bottom temperature value at the same time is greater than the fourth preset threshold.

[0063] When both the top and bottom temperature trends are upward, and the maximum bottom temperature and the maximum top temperature are both greater than the first preset threshold, it means that the overall temperature is too high and still has an upward trend. Therefore, it is necessary to reduce the power of the first and second heating elements to suppress the temperature rise and avoid exceeding the upper limit of the target temperature range.

[0064] When both the top and bottom temperatures are trending downwards, and the minimum bottom and top temperatures are both less than the second preset threshold, it means that the overall temperature is too low and still has a downward trend. Therefore, it is necessary to increase the power of the first and second heating elements to suppress the temperature decline and prevent it from falling below the lower limit of the target temperature range.

[0065] When the top temperature shows an upward trend and the bottom temperature shows a downward trend, if the temperature value recorded within the cycle satisfies the condition that the first difference between the bottom temperature value and the top temperature value at the same moment is greater than the third preset threshold, it means that the temperature difference between different areas in the cooking cavity is increasing, and the bottom temperature is greater than the top temperature. Therefore, it is necessary to reduce the power of the first heating element that mainly affects the bottom temperature and increase the power of the second heating element that mainly affects the top temperature to suppress the trend of increasing temperature difference and make the temperature in the cooking cavity more uniform.

[0066] When the top temperature shows a downward trend and the bottom temperature shows an upward trend, if the second difference between the top temperature and the bottom temperature at the same moment is greater than the fourth preset threshold, it means that the temperature difference between different areas in the cooking cavity is increasing, and the bottom temperature is lower than the top temperature. Therefore, it is necessary to increase the power of the first heating element that mainly affects the bottom temperature and decrease the power of the second heating element that mainly affects the top temperature to suppress the trend of increasing temperature difference and make the temperature in the cooking cavity more uniform.

[0067] In some embodiments of the present invention, when temperature values are recorded by using the bottom temperature array and the top temperature array, the maximum bottom temperature is determined by the maximum value in the bottom temperature array, the maximum top temperature is determined by the maximum value in the top temperature array, the minimum bottom temperature is determined by the minimum value in the bottom temperature array, and the minimum top temperature is determined by the minimum value in the top temperature array.

[0068] It can be understood that the bottom temperature array and the top temperature array are updated every preset time interval, and the maximum and minimum values therein also change correspondingly, so the maximum bottom temperature, the minimum bottom temperature, the maximum top temperature and the minimum top temperature are redetermined every preset period.

[0069] In some embodiments of the present invention, the first preset threshold and the second preset threshold are associated with a target temperature range, and the target temperature range can be determined by a target heat preservation temperature Ttarget and an allowable fluctuation range △T1. With reference to Figure 2 , the first preset adjustment condition can be expressed as: TBmax>Ttarget+△T1 and TTmax>Ttarget+△T1; TBmax is the maximum bottom temperature, and TTmax is the maximum top temperature. The second preset adjustment condition can be expressed as: TBmin<Ttarget-△T1 and TTmin<Ttarget-△T1; TBmin is the minimum bottom temperature, and TTmin is the minimum top temperature. The third preset threshold and the fourth preset threshold can be determined by the allowable maximum temperature difference △T2 in the cooking cavity. The third preset adjustment condition can be expressed as: TTop<TBot-△T2; TTop is a top temperature value, and TBot is a bottom temperature value. The fourth preset adjustment condition can be expressed as: TTop>TBot+△T2; TTop is a top temperature value, and TBot is a bottom temperature value. In some embodiments of the present invention, Ttarget can be set to 70°C, △T1 can be set to 0.5°C, and △T2 can be set to 1°C.

[0070] It can be understood that the temperature change trend needs to be suppressed only when the preset adjustment condition is satisfied. For example, when the overall temperature is low, both the bottom temperature change trend and the top temperature change trend are upward trends, but the first preset adjustment condition is not satisfied. In this case, there is no need to suppress the bottom temperature change trend and the top temperature change trend, which can avoid excessively low overall temperature and maintain stable heat preservation.

[0071] With reference to Figure 2 , in some embodiments of the zoned heating heat preservation control method for a cooking appliance of the present invention, the method further comprises: When in the heat preservation maintaining mode, if it is determined that the heat preservation duration is greater than a preset time threshold, the heat preservation maintaining mode is exited.

[0072] When the duration of the heat preservation mode exceeds a preset time threshold, the system exits the heat preservation mode, which can be done by entering standby mode to avoid prolonged power consumption and save energy. In some embodiments of the present invention, the preset time threshold can be set to 24 hours.

[0073] The following description of the cooking appliance provided by the present invention can be used in conjunction with the above-described heat preservation control method for zoned heating cooking appliances.

[0074] refer to Figures 3 to 5 The present invention also provides a cooking appliance, including a main body 100. The main body 100 is provided with a control unit 110, a bottom temperature detection unit 121, a top temperature detection unit 122, a cooking cavity 101, and a first heating element 200 and a second heating element 300, both used for heating the cooking cavity 101. The control unit 110 is electrically connected to the bottom temperature detection unit 121, the top temperature detection unit 122, the first heating element 200, and the second heating element 300, respectively. The bottom temperature detection unit 121 is used to detect the bottom temperature of the cooking cavity 101, and the top temperature detection unit 122 is used to detect the top temperature of the cooking cavity 101. The control unit 110 is used to execute the above-mentioned zoned heating cooking appliance heat preservation control method.

[0075] Bottom temperature detection unit 121 detects the bottom temperature of cooking cavity 101 and generates bottom temperature detection information. Top temperature detection unit 122 detects the top temperature of cooking cavity 101 and generates top temperature detection information. Control unit 110 determines the bottom and top temperatures of cooking cavity 101 based on the bottom and top temperature detection information, thereby obtaining the temperature distribution of cooking cavity 101. The first heating element 200 and the second heating element 300 heat the same cooking cavity 101. Because the heating positions of the first heating element 200 and the second heating element 300 are different, their impact on the regional temperature of cooking cavity 101 is also different, achieving a zoned heating effect. By determining the bottom and top temperature change trends, control unit 110 controls the first heating element 200 and the second heating element 300. Utilizing the zoned heating effect of the first heating element 200 and the second heating element 300, the bottom and top temperatures of cooking cavity 101 are kept within the target temperature range, achieving a more uniform and stable temperature within cooking cavity 101, which is beneficial for improving cooking results.

[0076] In some embodiments of the present invention, the cooking appliance may be an implementation of a device with a cooking function, such as a rice cooker.

[0077] refer to Figure 4 and Figure 5In some embodiments of the cooking appliance of the present invention, the first heating element 200 is an inner electric heating plate, the second heating element 300 is an outer electric heating plate, the outer electric heating plate is annular, the inner electric heating plate is located at the center of the outer electric heating plate, and the outer electric heating plate can float relative to the inner electric heating plate in directions close to and far from the cooking cavity.

[0078] The first heating element 200, i.e., the inner heating plate, is circular, and the second heating element 300, i.e., the outer heating plate, is annular. The first heating element 200 is located at the center of the second heating element 300, and the two can be co-centered to form an inner and outer heating plate structure. The outer heating plate can float relative to the inner heating plate in directions close to and away from the cooking cavity, ensuring that the inner pot can simultaneously maintain close contact with both the outer and inner heating plates, which is beneficial for ensuring efficient heat conduction between the outer and inner heating plates and the inner pot. The inner heating plate contacts the center of the bottom of the inner pot, quickly affecting the temperature of the bottom near the center of the cooking cavity 101. The outer heating plate contacts the edge of the bottom of the inner pot, quickly affecting the temperature of the side walls and top of the cooking cavity 101 through the side walls of the inner pot. Therefore, by controlling the first heating element 200 and the second heating element 300, the temperature of different areas in the cooking cavity 101 can be quickly affected, making temperature adjustment more flexible and allowing for more accurate temperature control, resulting in a more uniform and stable temperature in the cooking cavity 101.

[0079] In some embodiments of the present invention, the control unit 110 may be an implementation of a device or module with processing and control functions, including a microcontroller, an embedded chip, etc.; the bottom temperature detection unit 121 and the top temperature detection unit 122 may be implementations of devices such as temperature sensors. In some embodiments of the present invention, the cooking appliance is a rice cooker, and a steam valve may also be provided on the main body 100.

[0080] The present invention also provides a non-transitory storage medium on which an executable program is stored. When the executable program is executed by a processor, it implements the heat preservation control method for the zoned heating cooking appliance provided in the above embodiments.

[0081] Embodiments of the present invention also provide a control device, including: A temperature detection module is used to acquire bottom temperature detection information and top temperature detection information. The bottom temperature detection information represents the bottom temperature of the cooking cavity, and the top temperature detection information represents the top temperature of the cooking cavity. The processing module is used to determine the bottom temperature change trend based on the bottom temperature detection information and to determine the top temperature change trend based on the top temperature detection information. The power control module is used to control the first power of the first heating element and the second power of the second heating element of the cooking cavity according to the bottom temperature change trend and the top temperature change trend, so that the bottom temperature and the top temperature of the cooking cavity are both within the target temperature range.

[0082] The present invention also provides a control device, including a processor and a memory, wherein the memory stores a computer program, which is executed by the processor to implement the above-described method for controlling the heat preservation of a zoned heating cooking appliance.

[0083] The control device provided by this invention can be applied to rice cookers.

[0084] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0085] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of software products. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0086] Finally, it should be noted that the above embodiments are only for illustrating the present invention and not for limiting the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be covered within the protection scope of the present invention.

Claims

1. A method for heat preservation control of zoned heating cooking appliances, characterized in that, The cooking appliance's partitioned heating plate includes a first heating element and a second heating element, both used for heating food within the cooking cavity. The method includes: Obtain bottom temperature detection information and top temperature detection information, wherein the bottom temperature detection information represents the bottom temperature of the cooking cavity and the top temperature detection information represents the top temperature of the cooking cavity; The bottom temperature change trend is determined based on the bottom temperature detection information, and the top temperature change trend is determined based on the top temperature detection information. Based on the bottom temperature change trend and the top temperature change trend, the first power of the first heating element and the second power of the second heating element in the cooking cavity are controlled so that the bottom temperature and the top temperature of the cooking cavity are both within the target temperature range.

2. The heat preservation control method for zoned heating cooking appliances according to claim 1, characterized in that, Before determining the bottom temperature change trend based on the bottom temperature detection information and the top temperature change trend based on the top temperature detection information, the method further includes: Based on the bottom temperature detection information and the heat preservation time, the working mode is determined. The working mode includes a cooling mode in the early stage of the heat preservation phase and a heat preservation maintenance mode after the cooling mode. If the working mode is determined to be cooling mode, then the first heating element and the second heating element are controlled to stop heating; If the working mode is determined to be the heat preservation mode, then the steps of determining the bottom temperature change trend based on the bottom temperature detection information and determining the top temperature change trend based on the top temperature detection information are executed.

3. The heat preservation control method for zoned heating cooking appliances according to claim 1 or 2, characterized in that, The step of determining the bottom temperature change trend based on the bottom temperature detection information and determining the top temperature change trend based on the top temperature detection information includes: Based on the bottom temperature detection information, determine the maximum and minimum bottom temperature values ​​detected in the current cycle, and determine the bottom temperature change trend in the current cycle based on the maximum and minimum bottom temperature values. Based on the top temperature detection information, the maximum and minimum top temperatures detected in the current cycle are determined, and the top temperature change trend in the current cycle is determined based on the maximum and minimum top temperatures.

4. The heat preservation control method for zoned heating cooking appliances according to claim 3, characterized in that, The step of controlling the first power of the first heating element and the second power of the second heating element in the cooking cavity based on the bottom temperature change trend and the top temperature change trend includes: Based on the bottom temperature change trend and the top temperature change trend, a combination of change trends is determined, wherein the combination of change trends has at least two possible combinations; Based on the combination of the changing trends and the corresponding preset adjustment conditions, an adjustment strategy is determined, wherein the preset adjustment conditions characterize the temperature conditions for power adjustment. According to the adjustment strategy, the first power of the first heating element and the second power of the second heating element are adjusted.

5. The heat preservation control method for zoned heating cooking appliances according to claim 4, characterized in that, The first heating element is an inner heating plate, the second heating element is an outer heating plate, the outer heating plate is ring-shaped, and the inner heating plate is located at the center of the outer heating plate; The step of determining the adjustment strategy based on the combination of changing trends and corresponding preset adjustment conditions includes: If the combination of the changing trends is determined to be an upward trend in both the bottom temperature change trend and the top temperature change trend, and if the first preset adjustment condition is met, then the adjustment strategy is to control both the first heating element and the second heating element to reduce the preset power value. If the combination of the changing trends is determined to be a combination of a decreasing trend in both the bottom temperature and the top temperature, and if the second preset adjustment condition is met, then the adjustment strategy is to control both the first heating element and the second heating element to increase the preset power value. If the combination of changing trends is determined to be an upward trend in the bottom temperature and a downward trend in the top temperature, and if the third preset adjustment condition is satisfied, then the adjustment strategy is to control the first heating element to reduce the preset power value and control the second heating element to increase the preset power value. The combination of changing trends is determined to be a decreasing trend in the bottom temperature and an increasing trend in the top temperature, and a fourth preset adjustment condition is determined to be met. The adjustment strategy is to control the first heating element to increase the preset power value and control the second heating element to decrease the preset power value.

6. The heat preservation control method for zoned heating cooking appliances according to claim 5, characterized in that, The first preset adjustment condition is that both the maximum bottom temperature and the maximum top temperature are greater than a first preset threshold. The second preset adjustment condition is that both the minimum bottom temperature and the minimum top temperature are less than the second preset threshold. The third preset adjustment condition is that the first difference between the bottom temperature value and the top temperature value at the same time is greater than the third preset threshold. The fourth preset adjustment condition is that the second difference between the top temperature value and the bottom temperature value at the same time is greater than the fourth preset threshold.

7. The heat preservation control method for zoned heating cooking appliances according to claim 2, characterized in that, Also includes: When in the heat preservation mode, if the heat preservation duration is determined to be greater than a preset time threshold, the heat preservation mode is exited.

8. A cooking utensil, characterized in that, The appliance includes a main body (100), which is provided with a control unit (110), a bottom temperature detection unit (121), a top temperature detection unit (122), a cooking cavity (101), and a first heating element (200) and a second heating element (300) for heating the cooking cavity (101). The control unit (110) is electrically connected to the bottom temperature detection unit (121), the top temperature detection unit (122), the first heating element (200), and the second heating element (300), respectively. The bottom temperature detection unit (121) is used to detect the bottom temperature of the cooking cavity (101), and the top temperature detection unit (122) is used to detect the top temperature of the cooking cavity (101). The control unit (110) is used to execute the heat preservation control method for a zoned heating cooking appliance as described in any one of claims 1 to 7.

9. The cooking utensil according to claim 8, characterized in that, The first heating element is an inner heating plate, and the second heating element is an outer heating plate. The outer heating plate is ring-shaped, and the inner heating plate is located at the center of the outer heating plate. The outer heating plate can float relative to the inner heating plate in directions closer to and farther from the cooking cavity.

10. A non-transitory storage medium having an executable program stored thereon, characterized in that, When the executable program is executed by the processor, it implements the heat preservation control method for partitioned heating cooking appliances as described in any one of claims 1 to 7.

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