Temperature control method for electric heating plate electric rice cooker, electric heating plate electric rice cooker and storage medium

Abstract

The present application relates to the technical field of electric rice cooker temperature control, and provides an electric heating disc electric rice cooker temperature control method, an electric heating disc electric rice cooker and a storage medium, the method comprising: a constant temperature stage: in the constant temperature stage, the first electric heating disc and the second electric heating disc are alternately heated in each period by periodic control; temperature detection information in each period is obtained; a temperature change trend is determined according to the temperature detection information in the current period, and the power of the first electric heating disc and the second electric heating disc in the next period is adjusted according to the temperature change trend, so that the temperature of the cooking cavity is located in the target temperature range. Based on the thermal inertia characteristics of the electric heating disc, the first electric heating disc and the second electric heating disc are alternately controlled to heat periodically, the influence caused by thermal inertia is reduced, the temperature fluctuation range is reduced, the power is adjusted based on the temperature change trend, the temperature fluctuation is further reduced, the stability of temperature control in the heating process is improved, the heating is more flexibly and accurately controlled, and the temperature control deviation is reduced.

Description

Technical Field

[0001] This invention relates to the field of electric rice cooker temperature control technology, and in particular to a method for controlling the temperature of an electric heating plate rice cooker, an electric heating plate rice cooker, and a storage medium. Background Technology

[0002] Electric heating plate rice cookers use a heating plate structure to heat the food, distributing heat evenly throughout the pot via heat transfer. However, the heating process in electric heating plate rice cookers has significant thermal inertia, causing the actual temperature to lag behind the controlled temperature. This results in large temperature fluctuations when constant temperature control is required, easily exceeding the desired temperature range. This is particularly problematic in scenarios where strict temperature control is needed, such as yogurt making. Yogurt fermentation requires very precise temperatures, typically maintained within 40℃±5℃. Excessive heat can inactivate the yogurt's bacterial flora, negating its benefits for gut health and immunity, while insufficient heat will hinder fermentation. Therefore, existing electric heating plate rice cookers cannot meet the demands for precise temperature control. 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 temperature control method for electric heating plate rice cookers, which achieves precise temperature control based on the existence of thermal inertia.

[0004] The present invention also proposes an electric heating plate rice cooker and a storage medium.

[0005] According to a first aspect of the present invention, a method for temperature control of an electric heating plate rice cooker includes a first heating plate and a second heating plate, both used for heating food in a cooking cavity, the method comprising: Constant temperature stage: During the constant temperature phase, the first heating plate and the second heating plate are periodically controlled to alternate heating in each cycle; Acquire temperature detection information within each cycle, wherein the temperature detection information characterizes the temperature of the cooking cavity; Based on the temperature detection information within the current cycle, the temperature change trend is determined, and the power of the first and second heating plates in the next cycle is adjusted according to the temperature change trend to keep the temperature of the cooking cavity within the target temperature range. The electric heating plate rice cooker temperature control method according to an embodiment of the present invention has at least the following beneficial effects: the first and second heating plates heat the same cooking cavity. By periodically and alternately controlling the heating of the first and second heating plates in the cooking cavity, the first and second heating plates alternately start and stop. During the off period, the first and second heating plates can release the accumulated heat, reducing the overall accumulated heat during heating and mitigating the effects of thermal inertia. Simultaneously, by determining the temperature change trend based on the temperature detection information and then adjusting the power of the first and second heating plates in the next cycle in advance according to the temperature change trend of the current cycle, the temperature fluctuation range is further reduced, the accuracy of temperature control is further improved, and the temperature of the cooking cavity is maintained within the target temperature range. Therefore, based on the thermal inertia of the heating plate, the influence caused by thermal inertia is reduced by periodically alternating the heating of the first and second heating plates, reducing the temperature fluctuation range. The power is adjusted based on the temperature change trend to further reduce temperature fluctuation, improve the stability of temperature control during heating, and enable more flexible and precise heating control, reducing temperature control deviation.

[0006] According to one embodiment of the present invention, prior to the isothermal stage, the method further includes: Warming phase: Temperature detection information is acquired during the heating phase, and the temperature detection information represents the temperature of the cooking cavity. The first heating plate and the second heating plate are alternately controlled to heat the food until the temperature of the cooking cavity is determined to be greater than or equal to the first temperature threshold based on the temperature detection information. Wherein, the first temperature threshold is located within the target temperature range. According to an embodiment of the present invention, determining the temperature change trend based on the temperature detection information within the current period includes: The maximum and minimum temperature values ​​detected in the current cycle are determined based on the temperature detection information within the current cycle. The temperature change trend is determined based on the maximum and minimum temperature values ​​and the second temperature threshold. The second temperature threshold is located within the target temperature range.

[0007] According to an embodiment of the present invention, determining the temperature change trend based on the maximum temperature value, the minimum temperature value, and a second temperature threshold includes: Calculate the first difference between the maximum temperature value and the second temperature threshold, and calculate the second difference between the second temperature threshold and the minimum temperature value; If the first difference is determined to be greater than the second difference, then the upward trend in temperature is taken as the temperature change trend; If the first difference is determined to be equal to the second difference, then the temperature stability trend is taken as the temperature change trend; If the first difference is determined to be less than the second difference, then the temperature decreasing trend is taken as the temperature change trend.

[0008] According to one embodiment of the present invention, adjusting the power of the first heating plate and the second heating plate in the next cycle according to the temperature change trend includes: If the temperature change trend is determined to be an upward trend, then reduce the power of the first and second heating plates in the next cycle. If the temperature change trend is determined to be a stable temperature trend, then the first and second heating plates are controlled to maintain the current power until the end of the next cycle. If the temperature change trend is determined to be a decreasing trend, then the power of the first and second heating plates will be increased in the next cycle.

[0009] According to one embodiment of the present invention, it further includes: Get the cooking time settings; When starting to control the first or second electric heating plate to begin heating, a countdown is set according to the cooking time setting. Once the countdown timer reaches zero, the first and second heating plates are controlled to stop heating.

[0010] According to a second aspect of the present invention, an electric heating plate rice cooker includes a rice cooker body, the rice cooker body being provided with a control unit, a temperature detection unit, a cooking cavity, and a first heating plate and a second heating plate for heating food in the cooking cavity. One of the first heating plate and the second heating plate is buoyant relative to the other in directions approaching and moving away from the cooking cavity. The control unit is electrically connected to the temperature detection unit, the first heating plate, and the second heating plate, respectively. The temperature detection unit is used to detect the temperature of the cooking cavity, and the control unit is used to execute the above-described electric heating plate rice cooker temperature control method.

[0011] The electric heating plate rice cooker according to embodiments of the present invention has at least the following beneficial effects: The first and second electric heating plates heat the cooking cavity. By periodically alternating the heating of the first and second electric heating plates in the cooking cavity, the first and second electric heating plates alternately start and stop. During the off period, the first and second electric heating plates can release accumulated heat, reducing the overall accumulated heat during heating and mitigating the effects of thermal inertia. Simultaneously, by determining the temperature change trend based on temperature detection information, and then adjusting the power of the first and second electric heating plates in the next cycle according to the temperature change trend of the current cycle, the temperature fluctuation range is further reduced, the accuracy of temperature control is further improved, and the temperature of the cooking cavity is maintained within the target temperature range. Therefore, based on the thermal inertia characteristics of the heating plates, by periodically alternating the heating of the first and second electric heating plates, the effects caused by thermal inertia are reduced, the temperature fluctuation range is reduced, and the power is adjusted based on the temperature change trend, further reducing temperature fluctuations, improving the stability of temperature control during heating, and enabling more flexible and precise heating control, reducing temperature control deviations.

[0012] According to one embodiment of the present invention, the second heating plate surrounds the first heating plate, the first heating plate is fixedly disposed relative to the cooking cavity, and the second heating plate is floatingly disposed relative to the cooking cavity, with the floating direction being towards and away from the cooking cavity.

[0013] 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 electric heating plate rice cooker temperature control method.

[0014] A control device according to a fourth aspect of the present invention includes: The control module is used to periodically control the first and second heating plates to alternate heating in each cycle; A temperature detection module is used to acquire temperature detection information in each cycle, and the temperature detection information represents the temperature of the cooking cavity; The power adjustment module is used to determine the temperature change trend based on the temperature detection information in the current cycle, and adjust the power of the first heating plate and the second heating plate in the next cycle according to the temperature change trend, so that the temperature of the cooking cavity is within the target temperature range.

[0015] 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

[0016] 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.

[0017] Figure 1 This is one of the schematic diagrams of the electric heating plate rice cooker temperature control method provided in the embodiments of the present invention.

[0018] Figure 2 This is the second schematic diagram of the electric heating plate rice cooker temperature control method provided in the embodiment of the present invention.

[0019] Figure 3 This is a control flowchart of one embodiment of the electric heating plate rice cooker temperature control method provided in this invention.

[0020] Figure 4 This is a schematic diagram of the structure of the electric heating plate rice cooker provided in an embodiment of the present invention.

[0021] Figure 5 This is a cross-sectional schematic diagram of the electric heating plate rice cooker provided in an embodiment of the present invention.

[0022] Figure 6 This is a top view schematic diagram of the electric heating plate rice cooker provided in an embodiment of the present invention.

[0023] Figure label: 100: Rice cooker body; 101: Cooking cavity; 110: Control unit; 120: Temperature detection unit; 200: First heating plate; 300: Second heating plate. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Thermal inertia refers to the lag in temperature control response of heating equipment during temperature regulation, caused by the time required for heat accumulation and release. Specifically, electric heating plates have significant thermal inertia. During heating, even after the heating plate is turned off, the heat accumulated in it continues to be released through heat transfer, causing the temperature of the heated object to continue rising. This results in the actual temperature continuing to rise even though the temperature control target is to stop the temperature increase. The temperature only stops rising after the accumulated heat in the heating plate has been completely released. In other words, the actual temperature lags behind the temperature control, leading to large fluctuations in the actual temperature that exceed the required temperature range. This is especially problematic in applications like rice cookers, where high power requirements necessitate a correspondingly high-power heating plate, and the greater the power, the greater the impact of thermal inertia.

[0030] For the above situation, refer to Figure 1This invention provides a temperature control method for an electric heating plate rice cooker. The electric heating plate rice cooker includes a first electric heating plate and a second electric heating plate, both used for heating food inside the cooking cavity. The method includes: Constant temperature stage: S100: During the constant temperature stage, the first heating plate and the second heating plate are periodically controlled to alternate heating in each cycle; S110: Obtain temperature detection information within each cycle, wherein the temperature detection information characterizes the temperature of the cooking cavity; S120: Determine the temperature change trend based on the temperature detection information in the current cycle, and adjust the power of the first and second heating plates in the next cycle according to the temperature change trend, so that the temperature of the cooking cavity is within the target temperature range.

[0031] The first and second heating plates heat the same cooking cavity. By periodically alternating the heating of the first and second heating plates, they alternately start and stop. During the off-peak periods, the first and second heating plates release accumulated heat, reducing the overall heat buildup and mitigating the effects of thermal inertia. Simultaneously, temperature monitoring data determines the temperature trend, allowing for advance adjustment of the power of the first and second heating plates for the next cycle. This further reduces temperature fluctuations, improves temperature control accuracy, and maintains the cooking cavity temperature within the target range.

[0032] Therefore, based on the thermal inertia of the heating plate, the influence caused by thermal inertia is reduced by periodically alternating the heating of the first and second heating plates, reducing the temperature fluctuation range. The power is adjusted based on the temperature change trend to further reduce temperature fluctuation, improve the stability of temperature control during heating, and enable more flexible and precise heating control, reducing temperature control deviation.

[0033] Compared to threshold-triggered temperature control, which involves adjusting power upon reaching a set upper or lower temperature threshold, this invention determines the temperature change trend based on temperature detection information and then adjusts the power accordingly. This eliminates the need for the temperature to reach the upper or lower temperature threshold before adjustment, thus suppressing temperature changes that are far from the target temperature in advance. This further reduces the temperature fluctuation range, resulting in smaller fluctuations within the target temperature range and improving the accuracy of temperature control.

[0034] In some embodiments of the present invention, the temperature detection information can be obtained by devices such as temperature sensors. The temperature detection information can include the temperature at different locations in the cooking cavity, such as the bottom temperature and the top temperature of the cooking cavity of the rice cooker. One of them can be used as the temperature of the cooking cavity, such as using the bottom temperature as the temperature of the cooking cavity; or the average value of the temperatures at different locations can be used as the temperature of the cooking cavity, etc.

[0035] In some embodiments of the present invention, the first heating plate and the second heating plate of the cooking cavity are periodically and alternately controlled to heat, and the heating time of the first heating plate and the second heating plate does not overlap. The phrase "periodically controlling the first heating plate and the second heating plate to alternately heat in each cycle" as used in this application refers to the existence of multiple heating cycles, in which the first heating plate and the second heating plate are controlled to alternately heat in each heating cycle.

[0036] In some embodiments of the present invention, the target temperature range can be determined based on the heating function of the rice cooker. For example, if the user selects the heating function for cooking yogurt, the target temperature range is determined based on the preset temperature range corresponding to cooking yogurt. Specifically, 40±5℃ can be used as the target temperature range. Alternatively, the target temperature range can be determined based on the control signal. For example, if the user sets the target temperature according to their needs, the target temperature is combined with a preset temperature control accuracy range to obtain the target temperature range. Specifically, the user can set 70℃ as the target temperature and combine it with a preset temperature control accuracy range of ±3℃ to obtain a target temperature range of 70℃±3℃.

[0037] In some embodiments of the present invention, adjusting the first heating power of the first heating plate and the second heating power of the second heating plate can be achieved by adjusting the power adjustment ratio of the first heating plate and the power adjustment ratio of the second heating plate.

[0038] refer to Figure 2 In some embodiments of the electric heating plate rice cooker temperature control method of the present invention, before the constant temperature stage, the method further includes: Warming phase: S010: During the heating phase, temperature detection information is acquired, wherein the temperature detection information characterizes the temperature of the cooking cavity; S020: Alternately control the first heating plate and the second heating plate to heat until the temperature of the cooking cavity is determined to be greater than or equal to the first temperature threshold based on the temperature detection information; Wherein, the first temperature threshold is located within the target temperature range.

[0039] When cooking begins at room temperature, the temperature is significantly different from the target temperature range. Therefore, a heating phase begins, where the first and second heating plates alternately heat the cooking cavity periodically at relatively high power, rapidly raising the temperature to near the target range. Once the temperature of the cooking cavity is determined to be greater than or equal to a first temperature threshold based on temperature detection information, the heating phase ends and the temperature stabilizer phase begins. During the temperature stabilizer phase, the first and second heating plates also alternately heat periodically. Temperature trend is determined based on temperature detection information, and the power of the first and second heating plates is dynamically adjusted accordingly to maintain the cooking cavity temperature within the target range through alternating heating.

[0040] In this way, by controlling the power in stages, namely the heating stage and the constant temperature stage, the heating can be rapidly brought to the target temperature range, thereby improving the heating efficiency and ensuring the stability of temperature control.

[0041] In some embodiments of the present invention, during the heating stage, the first heating power of the first heating plate can be set to a first preset heating power, and the second heating power of the second heating plate can be set to a second preset heating power; during the constant temperature stage, the first heating power of the first heating plate can be set to a first preset constant temperature power, and the second heating power of the second heating plate can be set to a second preset constant temperature power, and the first heating power and the second heating power can be dynamically adjusted according to the temperature change trend.

[0042] It is understood that the first preset heating power and the second preset heating power can be the same or different; the first preset constant temperature power and the second preset constant temperature power can be the same or different; the first temperature threshold and the second temperature threshold can be the same or different.

[0043] In some embodiments of the present invention, the first preset heating power and the second preset heating power may also be associated with the heating function used, that is, the first preset heating power and the second preset heating power are determined by the heating function, such as yogurt cooking and rice cooking. The first preset heating power and the second preset heating power corresponding to the two heating functions are different. The target temperature range for yogurt cooking is lower than the target temperature range for rice cooking. Therefore, the first preset heating power and the second preset heating power corresponding to yogurt cooking can be preset to be relatively small to avoid the power exceeding the upper limit of the target temperature range due to thermal inertia.

[0044] In some embodiments of the present invention, the first constant temperature power and the second constant temperature power may be determined based on the target temperature range or based on the heating function. It is understood that the actual power required to achieve constant temperature varies depending on the usage environment. The first constant temperature power and the second constant temperature power serve as the base power for the constant temperature stage, approximating the actual power required to maintain a constant temperature. Subsequently, the power is dynamically adjusted based on temperature detection information and a second temperature threshold to maintain the cooking cavity temperature within the target temperature range.

[0045] refer to Figure 3 In some embodiments of the electric heating plate rice cooker temperature control method of the present invention, determining the temperature change trend based on the temperature detection information within the current cycle includes: The maximum and minimum temperature values ​​detected in the current cycle are determined based on the temperature detection information within the current cycle. The temperature change trend is determined based on the maximum and minimum temperature values ​​and the second temperature threshold. The second temperature threshold is located within the target temperature range.

[0046] The maximum and minimum temperature values ​​detected in the current cycle are determined periodically based on temperature detection information. Then, based on the maximum and minimum temperature values ​​and the second temperature threshold, the temperature change trend is determined. This allows the power of the first and second heating plates in the next cycle to be adjusted in advance according to the temperature change trend of the current cycle, which helps to further reduce the temperature fluctuation range and further improve the accuracy of temperature control.

[0047] refer to Figure 3 In some embodiments of the electric heating plate rice cooker temperature control method of the present invention, determining the temperature change trend based on the maximum temperature value, the minimum temperature value, and the second temperature threshold includes: Calculate the first difference between the maximum temperature value and the second temperature threshold, and calculate the second difference between the second temperature threshold and the minimum temperature value; If the first difference is determined to be greater than the second difference, then the upward trend in temperature is taken as the trend of temperature change. If the first difference is determined to be equal to the second difference, then the stable temperature trend is taken as the temperature change trend. If the first difference is determined to be less than the second difference, then the downward trend in temperature is taken as the trend of temperature change.

[0048] Subtracting the second temperature threshold from the maximum temperature value yields the first difference, and subtracting the minimum temperature value from the second temperature threshold yields the second difference. These two differences reflect the degree to which the maximum and minimum temperatures deviate from the second temperature threshold within the current cycle. If the first difference is greater than the second difference within the current cycle, it indicates an upward trend in the cooking cavity temperature; if the first difference equals the second difference, the cooking cavity temperature is stable; if the first difference is less than the second difference, the cooking cavity temperature is downward. Therefore, comparing the degree to which the maximum temperature deviates from the second temperature threshold with the degree to which the minimum temperature deviates from the second temperature threshold within the current cycle helps determine the temperature trend. This allows for advance adjustment of the power of the first and second heating plates in the next cycle, maintaining the temperature near the second temperature threshold and ensuring more stable temperature control with a smaller temperature fluctuation range.

[0049] In some embodiments of the present invention, the temperature change trend is determined based on the maximum temperature value, the minimum temperature value, and the second temperature threshold. In addition to the above-described method of calculating the first difference and the second difference, the average temperature value can also be calculated based on the maximum temperature value and the minimum temperature value, and the average temperature value can be compared with the second preset threshold to determine the temperature change trend.

[0050] In some embodiments of the present invention, the temperature change trend is determined based on the temperature detection information in the current cycle. In addition to determining it by the maximum temperature value, minimum temperature value and second temperature threshold in the current cycle, it can also be determined by the average slope of the temperature value change slope based on the temperature detection information in the current cycle, and then the temperature change trend is determined based on whether the average slope is positive, negative or zero.

[0051] refer to Figure 3 In some embodiments of the electric heating plate rice cooker temperature control method of the present invention, determining the maximum and minimum temperature values ​​detected in the current cycle based on the temperature detection information in the current cycle can be achieved in the following ways: Construct a historical temperature array of a preset length; Based on the temperature detection information, the temperature of the cooking cavity is recorded every second preset cycle and added to the historical temperature array, and the earliest recorded value is removed from the historical temperature array; At each first preset period, the historical temperature array and the second temperature threshold are calculated and processed, and the temperature change trend is determined based on the calculation results. The second preset period is less than or equal to the first preset period.

[0052] A historical temperature array of preset length is constructed. Every second preset period, the temperature value of the cooking cavity is recorded and stored in the historical temperature array, ensuring that the array reflects temperature changes within the cooking cavity. Simultaneously, the oldest recorded value is removed from the historical temperature array, ensuring that the array reflects the most recent temperature changes and preventing outdated values ​​from influencing current temperature fluctuations. Calculations are performed based on the historical temperature array and a second temperature threshold. Comparing historical temperature changes with the second threshold determines the temperature trend relative to the target temperature.

[0053] It is understandable that when constructing the historical temperature array, the initial historical temperature array contains the initial values. Subsequently, the recorded temperature values ​​are loaded into the array every preset period, and the earliest value is removed accordingly when a temperature value is loaded. This can be the initial value, and after the array is full, the earliest recorded temperature value in the array is removed.

[0054] To facilitate understanding, let's illustrate with an example: Assuming a preset length of 3, the historical temperature array can store three values. If the initial value is [0,0,0], and the temperature change sequence is 40℃, 41℃, 40℃, and 39℃, then after adding the temperatures recorded in the first three periods to the historical temperature array, the array becomes [40,41,40]. When recording the temperature in the fourth period, the earliest recorded value, i.e., the first 40℃, is removed, and then 39℃ is stored, resulting in the historical temperature array [41, 40, 39]. In this way, we can focus on the temperature changes within the most recent time period. The preset length can be set according to application requirements.

[0055] The second preset period is less than or equal to the first preset period, meaning the frequency of temperature sampling and recording is greater than or equal to the frequency of power adjustment. For example, a second preset period of 1 second means that one temperature value is confirmed and recorded in the historical temperature array every second based on temperature detection information, and the oldest value is removed. The first preset period can be 8 seconds, meaning that the temperature change trend is confirmed every 8 seconds based on the historical temperature array, and then the first and second heating powers are adjusted accordingly; the first preset period can also be 1 second, which is the same as the second preset period, where the temperature change trend is confirmed after each recorded temperature value updates the historical temperature array, and then the first and second heating powers are adjusted accordingly. It is understandable that the shorter the first preset period, the higher the accuracy of temperature adjustment, but the processing performance requirements also increase accordingly. The first and second preset periods can be set according to the actual application.

[0056] refer to Figure 3 In some embodiments of the electric heating plate rice cooker temperature control method of the present invention, adjusting the power of the first and second electric heating plates in the next cycle according to the temperature change trend includes: If the temperature change trend is determined to be an upward trend, then reduce the power of the first and second heating plates in the next cycle. If the temperature change trend is determined to be a stable temperature trend, then the first and second heating plates are controlled to maintain the current power until the end of the next cycle. If the temperature change trend is determined to be a decreasing trend, then increase the power of the first and second heating plates in the next cycle.

[0057] When the temperature is trending upward, the power of the first and second heating plates is reduced to suppress this upward trend. When the temperature is stable, the power of the first and second heating plates is maintained. When the temperature is trending downward, the power of the first and second heating plates is increased to suppress this downward trend. Thus, by adjusting the first and second heating power according to the temperature change trend, a stable temperature is achieved. In some embodiments of the invention, reducing or increasing the power of the first and second heating plates can be done by adjusting the power by a unit adjustment value, which avoids excessive power reduction or increase. In some embodiments of the invention, in addition to adjusting by a unit adjustment value, the first and second heating power can also be adjusted based on the temperature change trend, combined with the absolute value of the difference between the first and second differences, so that the larger the absolute value of the difference between the first and second differences, the larger the power adjustment value.

[0058] In some embodiments of the electric heating plate rice cooker temperature control method of the present invention, the first electric heating plate and the second electric heating plate are periodically controlled to alternately heat in each cycle, including: Within each preset alternation cycle, the first heating plate and the heating plate are switched on alternately. At least one of the first heating plate and the second heating plate is in the off state.

[0059] During both the heating and constant-temperature phases, the first and second heating plates operate alternately according to a preset alternation cycle, differing only in their power control. During alternating heating, at least one of the first and second heating plates is off; that is, the start-up times of the first and second heating plates do not overlap. This allows both heating plates to fully release accumulated heat, further mitigating the effects of thermal inertia and improving the accuracy and stability of temperature control.

[0060] In some embodiments of the present invention, the first preset period and the preset alternation period for controlling the alternating start of the first heating plate and the second heating plate may be equal, so that the power adjustment and the alternating start are synchronized; in other embodiments, the first preset period and the preset alternation period may also be unequal.

[0061] refer to Figure 3 In some embodiments of the electric heating plate rice cooker temperature control method of the present invention, it further includes: Get the cooking time settings; When starting to control the first or second heating plate to begin heating, set a countdown timer according to the cooking time setting. Once the countdown reaches zero, the first and second heating plates will stop heating.

[0062] By setting a countdown timer based on the cooking time settings, the countdown begins when heating starts and stops when the countdown reaches zero, thus halting the operation of both the first and second heating plates. This allows for flexible setting of the heating duration according to heating needs, making it more convenient to use.

[0063] In some embodiments of the present invention, the cooking time can be determined based on the user's selection of the heating function of the rice cooker; alternatively, the cooking time can be set by a control signal generated by the user's operation.

[0064] The electric heating plate rice cooker provided by the present invention is described below, and can be referred to in conjunction with the above-described electric heating plate rice cooker temperature control method.

[0065] refer to Figures 4 to 6 The present invention also provides an electric heating plate rice cooker, including a rice cooker body 100. The rice cooker body 100 is provided with a control unit 110, a temperature detection unit 120, a cooking cavity 101, and a first electric heating plate 200 and a second electric heating plate 300 for heating food in the cooking cavity 101. One of the first electric heating plate 200 and the second electric heating plate 300 can float relative to the other in directions close to and away from the cooking cavity. The control unit 110 is electrically connected to the temperature detection unit 120, the first electric heating plate 200, and the second electric heating plate 300, respectively. The temperature detection unit 120 is used to detect the temperature of the cooking cavity 101, and the control unit 110 is used to execute the above-described electric heating plate rice cooker temperature control method.

[0066] The first heating plate 200 and the second heating plate 300 heat the cooking cavity 101. By periodically alternating the heating of the first heating plate 200 and the second heating plate 300, they alternately start and stop. During the off period, the first heating plate 200 and the second heating plate 300 can release the accumulated heat, reducing the overall accumulated heat during heating and mitigating the effects of thermal inertia. Simultaneously, by determining the temperature change trend based on temperature detection information, the first heating power of the first heating plate 200 and the second heating power of the second heating plate 300 in the next cycle are adjusted in advance according to the temperature change trend of the current cycle. This further reduces the temperature fluctuation range and improves the accuracy of temperature control, ensuring that the temperature of the cooking cavity remains within the target temperature range. Therefore, based on the thermal inertia of the heating plate, the influence caused by thermal inertia is reduced by periodically alternating the heating of the first heating plate 200 and the second heating plate 300. This reduces the temperature fluctuation range, adjusts the power based on the temperature change trend, further reduces temperature fluctuation, improves the stability of temperature control during heating, and enables more flexible and precise heating control, reducing temperature control deviation.

[0067] Compared with a single-plate heating structure, the alternating heating of the first heating plate 200 and the second heating plate 300 results in a more uniform heat distribution inside the rice cooker body 100. The alternating heating has less power overlap compared to the single heating, resulting in much weaker thermal inertia and thus less temperature control error. At the same time, the dual heat sources of the first heating plate 200 and the second heating plate 300 make the temperature field more uniform, thereby making the overall temperature control more effective and further reducing temperature deviation.

[0068] Regarding the structure of the first heating plate 200 and the second heating plate 300, by allowing one of the first heating plate 200 and the second heating plate 300 to float relative to the other in the direction of approaching and moving away from the cooking cavity, that is, at least one of the first heating plate 200 or the second heating plate can float up and down, so that the inner pot placed in the cooking cavity 101 can contact both the first heating plate 200 and the second heating plate 300, ensuring tight contact and improving the efficiency of heat conduction.

[0069] refer to Figure 5 and Figure 6 In some embodiments of the present invention, the second heating plate 300 surrounds the first heating plate 200, the first heating plate 200 is fixedly disposed relative to the cooking cavity 101, and the second heating plate 300 is floatingly disposed relative to the cooking cavity 101, with the floating direction being towards and away from the cooking cavity.

[0070] The first heating plate 200 is fixed relative to the cooking cavity 101, while the second heating plate 300 is floating relative to the cooking cavity 101. This allows the inner pot to be placed in the cooking cavity 101, with its bottom first contacting the second heating plate 300. The inner pot then drives the second heating plate 300 to sink, ensuring the inner pot remains in contact with both the second and first heating plates until it contacts the first heating plate 200. This ensures close contact between the inner pot and both heating plates. Furthermore, the second heating plate 300 is annular, while the first heating plate 200 is circular and located within it, forming an inner and outer heating plate structure. This facilitates more even heat distribution during alternating heating.

[0071] 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, such as a microcontroller or an embedded chip; the temperature detection unit 120 may be an implementation of a device such as a temperature sensor, and two or more temperature sensors may be provided, such as temperature sensors being provided at the bottom and top of the cooking cavity 101 inside the rice cooker body 100.

[0072] In some embodiments of the present invention, a steam valve may also be provided on the rice cooker body 100.

[0073] refer to Figure 3 In one embodiment of the present invention, the heating control process is as follows: Cooking begins; the first heating plate 200 and the second heating plate 300 alternately heat at a preset heating power according to a preset alternation cycle; the preset heating power is maintained until the temperature is determined to be greater than or equal to 40°C (a first temperature threshold) based on temperature detection information; the power of the first heating plate 200 and the second heating plate 300 is reduced to a preset constant temperature power; a historical temperature array with a capacity of A1 (preset length A1) is constructed, and the temperature values ​​recorded according to a second preset cycle are loaded into the historical temperature array; every first preset cycle, based on the historical temperature array and 40°C (the second temperature threshold), the maximum value N1 in the historical temperature array is subtracted by 40 to obtain a first difference B1, and the minimum value N2 in the historical temperature array is subtracted by 40 to obtain a second difference B2; B1 and B2 are compared to determine the temperature change trend, and then the power of the first heating plate 200 and the second heating plate 300 is adjusted according to the temperature change trend until the cooking countdown reaches zero.

[0074] 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 is implemented to perform the electric heating plate rice cooker temperature control method provided in the above embodiments.

[0075] The control device provided by the present invention is described below, and can be referred to in conjunction with the above-described electric heating plate rice cooker temperature control method.

[0076] The present invention also provides a control device, comprising: The control module is used to periodically control the first and second heating plates to alternate heating in each cycle; A temperature detection module is used to acquire temperature detection information in each cycle, and the temperature detection information represents the temperature of the cooking cavity; The power adjustment module is used to determine the temperature change trend based on the temperature detection information in the current cycle, and adjust the power of the first heating plate and the second heating plate in the next cycle according to the temperature change trend, so that the temperature of the cooking cavity is within the target temperature range.

[0077] 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 electric heating plate rice cooker temperature control method.

[0078] The control device provided by this invention can be applied to electric heating plate rice cookers.

[0079] 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.

[0080] 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.

[0081] 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 scope of the claims of the present invention.

Claims

1. A method for temperature control in an electric rice cooker with an electric heating plate, characterized in that, The electric heating plate rice cooker includes a first electric heating plate and a second electric heating plate, both used for heating food inside the cooking cavity. The method includes: Constant temperature stage: During the constant temperature phase, the first heating plate and the second heating plate are periodically controlled to alternate heating in each cycle; Acquire temperature detection information within each cycle, wherein the temperature detection information characterizes the temperature of the cooking cavity; Based on the temperature detection information within the current cycle, the temperature change trend is determined, and the power of the first and second heating plates is adjusted according to the temperature change trend in the next cycle so that the temperature of the cooking cavity is within the target temperature range.

2. The temperature control method for an electric rice cooker with an electric heating plate according to claim 1, characterized in that, Prior to the isothermal stage, the following is also included: Warming phase: Temperature detection information is acquired during the heating phase, and the temperature detection information represents the temperature of the cooking cavity. The first heating plate and the second heating plate are alternately controlled to heat the food until the temperature of the cooking cavity is determined to be greater than or equal to the first temperature threshold based on the temperature detection information. Wherein, the first temperature threshold is located within the target temperature range.

3. The temperature control method for an electric rice cooker with an electric heating plate according to claim 1, characterized in that, Determining the temperature change trend based on the temperature detection information within the current period includes: The maximum and minimum temperature values ​​detected in the current cycle are determined based on the temperature detection information within the current cycle. The temperature change trend is determined based on the maximum and minimum temperature values ​​and the second temperature threshold. The second temperature threshold is located within the target temperature range.

4. The temperature control method for an electric rice cooker with an electric heating plate according to claim 3, characterized in that, The step of determining the temperature change trend based on the maximum temperature value, the minimum temperature value, and the second temperature threshold includes: Calculate the first difference between the maximum temperature value and the second temperature threshold, and calculate the second difference between the second temperature threshold and the minimum temperature value; If the first difference is determined to be greater than the second difference, then the upward trend in temperature is taken as the temperature change trend; If the first difference is determined to be equal to the second difference, then the temperature stability trend is taken as the temperature change trend; If the first difference is determined to be less than the second difference, then the temperature decreasing trend is taken as the temperature change trend.

5. The temperature control method for an electric rice cooker with an electric heating plate according to any one of claims 1 to 4, characterized in that, The step of adjusting the power of the first and second heating plates in the next cycle according to the temperature change trend includes: If the temperature change trend is determined to be an upward trend, then reduce the power of the first and second heating plates in the next cycle. If the temperature change trend is determined to be a stable temperature trend, then the first and second heating plates are controlled to maintain the current power until the end of the next cycle. If the temperature change trend is determined to be a decreasing trend, then the power of the first and second heating plates will be increased in the next cycle.

6. The temperature control method for an electric rice cooker with an electric heating plate according to any one of claims 1 to 4, characterized in that, Also includes: Get the cooking time settings; When starting to control the first or second electric heating plate to begin heating, a countdown is set according to the cooking time setting. Once the countdown timer reaches zero, the first and second heating plates are controlled to stop heating.

7. An electric rice cooker with an electric heating plate, characterized in that, The rice cooker includes a rice cooker body (100), which is provided with a control unit (110), a temperature detection unit (120), a cooking cavity (101), and a first heating plate (200) and a second heating plate (300) for heating food in the cooking cavity (101). One of the first heating plate and the second heating plate can float relative to the other in directions close to and away from the cooking cavity. The control unit (110) is electrically connected to the temperature detection unit (120), the first heating plate (200), and the second heating plate (300), respectively. The temperature detection unit (120) is used to detect the temperature of the cooking cavity (101), and the control unit (110) is used to execute the electric heating plate rice cooker temperature control method as described in any one of claims 1 to 6.

8. The electric heating plate rice cooker according to claim 7, characterized in that, The second heating plate surrounds the first heating plate. The first heating plate is fixed relative to the cooking cavity, and the second heating plate is floating relative to the cooking cavity, with the floating direction being towards and away from the cooking cavity.

9. 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 electric heating plate rice cooker temperature control method as described in any one of claims 1 to 6.

10. A control device, characterized in that, include: The control module is used to periodically control the first and second heating plates to alternate heating in each cycle; A temperature detection module is used to acquire temperature detection information in each cycle, and the temperature detection information represents the temperature of the cooking cavity; The power adjustment module is used to determine the temperature change trend based on the temperature detection information in the current cycle, and adjust the power of the first heating plate and the second heating plate in the next cycle according to the temperature change trend, so that the temperature of the cooking cavity is within the target temperature range.

Images