Electric oven and method for controlling temperature of electric oven inner container

Abstract

The present invention discloses an electric oven and a method for controlling the temperature of an electric oven liner. In the electric oven, which includes an electric oven liner, a sensor, and a controller, the controller is configured to: obtain a preset temperature input by a user, and based on the preset temperature, obtain a first dynamic preset temperature corresponding to the preset temperature in a heating stage and a second dynamic preset temperature corresponding to the preset temperature in a stabilization stage; obtain a target duty cycle based on the second dynamic preset temperature and a limit value of a preset temperature rise curve; use the difference between the first dynamic preset temperature and the actual temperature as a first temperature difference, and adjust the actual duty cycle of the electric oven liner based on the first temperature difference and the target duty cycle, predict the change of the oven center temperature through the value change of the sensor and the selected mode, and keep the duty cycle non-zero, so that the temperature fluctuation of the oven is greatly reduced and the difference between the center temperature of the oven and the set temperature is lower.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and more specifically, to an electric oven and a method for controlling the temperature of an inner container of the electric oven. Background Art

[0002] As people's living standards improve, their expectations for home cooking are also rising. They expect to be able to prepare a wider variety of dishes at home and to achieve the desired results when learning recipes. Consequently, they have higher expectations for the temperature control of their home ovens. They expect the internal temperature of the oven to closely match the set temperature and to remain as stable as possible during the hold phase, rather than fluctuating.

[0003] At present, some home appliance manufacturers have tried some methods to improve the temperature control accuracy of electric ovens. However, the performance accuracy of actual products is still insufficient, and there is still a deviation between the actual temperature in the oven and the set temperature. When using this oven, users have to adjust the cooking time according to the oven conditions, which greatly increases the difficulty of cooking.

[0004] PID control is currently the most widely used method in the industry for controlling oven temperature. However, its effectiveness varies widely. Large temperature fluctuations during baking can lead to excessive browning of food, increase the risk of surface cracking, and increase the risk of harmful substances.

[0005] Furthermore, because most manufacturers place the sensor in a corner of the oven cavity, there's a temperature difference between the sensor and the center of the oven. This difference can vary depending on the oven's operating mode and stage. This can lead to insufficient or excessive temperatures when baking food, resulting in food that doesn't achieve the desired flavor. This can also cause problems for users, hindering recipe execution and creating issues. In some cases, it can even produce harmful substances, posing a health risk.

[0006] Therefore, how to provide an electric oven and an electric oven inner container temperature control method to reduce the deviation between the actual temperature inside the oven and the set temperature is a technical problem to be solved. Summary of the Invention

[0007] The invention provides an electric oven, which is used to solve the technical problem in the prior art that the actual temperature of an oven inner container of the electric oven deviates too much from the set temperature.

[0008] The electric oven includes:

[0009] Electric oven liner;

[0010] A sensor for detecting the actual temperature of the inner container of the electric oven;

[0011] The controller is configured as:

[0012] Obtaining a preset temperature input by a user, and based on the preset temperature, obtaining a first dynamic preset temperature corresponding to the preset temperature in a heating phase and a second dynamic preset temperature corresponding to the preset temperature in a stabilization phase;

[0013] Obtaining a target duty cycle based on the second dynamic preset temperature and a limit value of a preset temperature rise curve;

[0014] The difference between the first dynamic preset temperature and the actual temperature is used as a first temperature difference, and the actual duty cycle of the electric oven inner pot is adjusted based on the first temperature difference and the target duty cycle.

[0015] In some embodiments of the present application, obtaining the target duty cycle based on the second dynamic preset temperature and the limit value of the preset temperature rise curve is specifically achieved by the following formula:

[0016] μ0=(T2-troom temperature) / (Ktroom temperature)*100%;

[0017] Wherein, μ0 is the target duty cycle, T2 is the second dynamic preset temperature, K is the limit value, and troom is the indoor temperature.

[0018] In some embodiments of the present application, the controller is specifically configured to:

[0019] Determining whether the first temperature difference is less than 0;

[0020] If yes, taking the difference between the second dynamic preset temperature and the actual temperature as a second temperature difference, and adjusting the duty cycle of the electric oven inner pot based on the second temperature difference;

[0021] If not, it is determined whether the first temperature difference is greater than a first dynamic preset temperature of a preset multiple.

[0022] In some embodiments of the present application, the controller is configured to:

[0023] Determine whether the second temperature difference is less than 0;

[0024] If so, determining whether the second temperature difference is less than a second dynamic preset temperature by a preset multiple;

[0025] If not, after the accumulated time reaches the first timing, the actual duty cycle of the electric oven inner pot is adjusted according to the first timing and the delay time.

[0026] In some embodiments of the present application, the controller is configured to:

[0027] When the first timing is less than the delay time, adjusting the actual duty cycle to 100%;

[0028] When the first timing is greater than or equal to the delay time, determining the actual duty cycle according to a second formula and the target duty cycle;

[0029] The second formula is μ=μ0%+ΔT2%, where μ is the actual duty cycle, μ0 is the target duty cycle, and ΔT2 is the second temperature difference.

[0030] In some embodiments of the present application, the controller is configured to:

[0031] When the second temperature difference is less than a second dynamic preset temperature of a preset multiple, adjusting the actual duty cycle to a minimum duty cycle;

[0032] When the second temperature difference is greater than or equal to a second dynamic preset temperature of a preset multiple, the actual duty cycle is determined according to the second formula and the target duty cycle.

[0033] In some embodiments of the present application, the controller is configured to:

[0034] When the first temperature difference is greater than a first dynamic preset temperature of a preset multiple, adjusting the actual duty cycle to 100%;

[0035] When the first temperature difference is not greater than a first dynamic preset temperature of a preset multiple and the duty cycle of the previous cycle is not 100%, determining the actual duty cycle based on a first formula;

[0036] When the first temperature difference is not greater than a first dynamic preset temperature of a preset multiple and the duty cycle of the previous cycle is 100%, after the accumulated time reaches a second timing, the actual duty cycle of the electric oven inner container is adjusted according to the second timing and the delay time;

[0037] The first formula is μ=μ0%+ΔT1%, where μ is the actual duty cycle, μ0 is the target duty cycle, and ΔT1 is the first temperature difference.

[0038] In some embodiments of the present application, the controller is configured to:

[0039] Determining whether the second timing is less than the delay time;

[0040] If yes, adjusting the actual duty cycle based on a third formula;

[0041] If not, adjusting the duty cycle of the electric oven inner container based on the second temperature difference;

[0042] The third formula is μ=μ0%+0.1T1%, where μ is the actual duty cycle, μ0 is the target duty cycle, and T1 is the first dynamic preset temperature.

[0043] Accordingly, the present invention also proposes a method for controlling the temperature of an electric oven inner container, which is applied to an electric oven comprising an electric oven inner container, a sensor, and a controller. The method comprises:

[0044] Obtaining a preset temperature input by a user, and based on the preset temperature, obtaining a first dynamic preset temperature corresponding to the preset temperature in a heating phase and a second dynamic preset temperature corresponding to the preset temperature in a stabilization phase;

[0045] Obtaining a target duty cycle based on the second dynamic preset temperature and a limit value of a preset temperature rise curve;

[0046] The difference between the first dynamic preset temperature and the actual temperature is used as a first temperature difference, and the actual duty cycle of the electric oven inner pot is adjusted based on the first temperature difference and the target duty cycle.

[0047] By applying the above technical solution, in an electric oven including an electric oven inner pot, a sensor and a controller, the controller is configured to: obtain a preset temperature input by a user, and based on the preset temperature, obtain a first dynamic preset temperature corresponding to the preset temperature in a heating stage and a second dynamic preset temperature corresponding to the preset temperature in a stabilization stage; obtain a target duty cycle based on the second dynamic preset temperature and the limit value of a preset temperature rise curve; use the difference between the first dynamic preset temperature and the actual temperature as a first temperature difference, and adjust the actual duty cycle of the electric oven inner pot based on the first temperature difference and the target duty cycle, predict the change in the center temperature of the oven through the value change of the sensor and the selected mode, and keep the duty cycle non-zero, thereby reducing the delay of heat conduction when the oven is in operation, thereby significantly reducing the temperature fluctuation of the oven and lowering the difference between the center temperature of the oven and the set temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 A schematic diagram of a test process for a preset temperature rise curve proposed in an embodiment of the present invention is shown;

[0050] Figure 2 A schematic flow chart of a method for controlling the temperature of an inner container of an electric oven according to an embodiment of the present invention is shown;

[0051] Figure 3A flow chart of a method for controlling the temperature of an inner container of an electric oven according to another embodiment of the present invention is shown. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0054] PID control is currently the most widely used method in the industry for controlling oven temperature. However, its effectiveness varies widely. Large temperature fluctuations during baking can lead to excessive browning of food, increase the risk of surface cracking, and increase the risk of harmful substances.

[0055] Furthermore, because most manufacturers place the sensor in a corner of the oven cavity, there's a temperature difference between the sensor and the center of the oven. This difference can vary depending on the oven's operating mode and stage. This can lead to insufficient or excessive temperatures when baking food, resulting in food that doesn't achieve the desired flavor. This can also cause problems for users, hindering recipe execution and creating issues. In some cases, it can even produce harmful substances, posing a health risk.

[0056] In light of this, the primary objective of this invention is to provide a method for controlling the temperature of an electric oven's inner container. This method incorporates a prediction mechanism into oven control, predicting changes in the oven's center temperature based on changes in sensor values ​​and a selected mode. This method also maintains a non-zero duty cycle, reducing the delay in heat conduction during oven operation. This significantly reduces oven temperature fluctuations and minimizes the difference between the oven's center temperature and the set temperature. Furthermore, this method extracts key parameters, allowing the algorithm to be migrated for different ovens simply by measuring the temperature rise curve, thus reducing the workload.

[0057] An embodiment of the present application provides an electric oven, comprising:

[0058] Electric oven liner;

[0059] A sensor for detecting the actual temperature of the inner container of the electric oven;

[0060] The controller is configured as:

[0061] Obtaining a preset temperature input by a user, and based on the preset temperature, obtaining a first dynamic preset temperature corresponding to the preset temperature in a heating phase and a second dynamic preset temperature corresponding to the preset temperature in a stabilization phase;

[0062] Obtaining a target duty cycle based on the second dynamic preset temperature and a limit value of a preset temperature rise curve;

[0063] The difference between the first dynamic preset temperature and the actual temperature is used as a first temperature difference, and the actual duty cycle of the electric oven inner pot is adjusted based on the first temperature difference and the target duty cycle.

[0064] In this embodiment, as described in the background, most manufacturers place the sensor in a corner of the oven cavity. Consequently, the sensor's temperature deviates from the oven's center temperature, and this deviation varies depending on the oven's operating mode and stage. This can lead to insufficient or excessive temperatures when baking food, resulting in food not achieving the desired flavor and causing problems for users, such as difficulty accurately following recipes.

[0065] In this solution, the actual temperature of the inner pot of the electric oven is collected by a sensor, and the second dynamic preset temperature corresponding to the stabilization stage and the first dynamic preset temperature corresponding to the heating stage are queried according to the preset temperature input by the user. At the same time, the target duty cycle of the electric oven is determined according to the second dynamic preset temperature and the pre-tested preset temperature rise curve. The actual duty cycle of the electric oven is adjusted according to the first temperature difference and the target duty cycle, thereby reducing the delay of heat conduction when the oven is in operation, greatly reducing the temperature fluctuation of the oven, and lowering the difference between the center temperature of the oven and the set temperature, thereby improving the user experience. The first temperature difference is the difference between the first dynamic preset temperature and the actual temperature.

[0066] In order to obtain the preset temperature rise curve, in some embodiments of the present application, as Figure 1 As shown, the steps for obtaining the preset temperature rise curve are specifically as follows:

[0067] A temperature measuring point is set at the center of the electric oven;

[0068] Controlling the electric oven to operate in a test mode with the heating tubes fully open, so that the electric oven heats up at full speed;

[0069] When the temperature at the temperature measuring point tends to be stable, the preset temperature rise curve of the electric oven is obtained, and the parameter values ​​of the preset temperature rise curve are obtained, wherein the parameter values ​​include the limit value of the curve, the limit time when the temperature rise value is 0.632 times the limit value, and the delay time of the center temperature response.

[0070] In this embodiment, Figure 1 As shown, a prediction link is introduced into the oven control. The temperature change at the center of the oven is predicted based on the value change of the sensor and the selected mode. The subsequent oven duty cycle is adjusted according to the predicted preset temperature rise curve. The specific test steps are: setting a temperature measurement point at the center of the electric oven; controlling the electric oven to fully open the heating tube and operate in test mode so that the electric oven can heat up at full speed; after the temperature at the temperature measurement point tends to be stable, analyzing the preset temperature rise curve of the electric oven and obtaining the important parameter values ​​of the preset temperature rise curve. The parameter values ​​specifically include the limit value of the curve, the limit time when the temperature rise value is 0.632 times the limit value, and the delay time of the center temperature response. When this control method is applied to a new electric oven, these three parameters need to be tested. These three parameters will also be used in the subsequent control method.

[0071] In order to obtain the target duty cycle based on the second dynamic preset temperature and the limit value of the preset temperature rise curve, in some embodiments of the present application, obtaining the target duty cycle based on the second dynamic preset temperature and the limit value of the preset temperature rise curve is specifically achieved by the following formula:

[0072] μ0=(T2-troom temperature) / (Ktroom temperature)*100%;

[0073] Wherein, μ0 is the target duty cycle, T2 is the second dynamic preset temperature, K is the limit value, and troom is the indoor temperature.

[0074] In this embodiment, the target duty cycle is obtained by the above formula, where K is the limit value in the preset temperature rise curve. The indoor temperature is obtained in the existing technology and will not be described in detail here.

[0075] In order to adjust the actual duty cycle, in some embodiments of the present application, the controller is specifically configured as follows:

[0076] Determining whether the first temperature difference is less than 0;

[0077] If yes, taking the difference between the second dynamic preset temperature and the actual temperature as a second temperature difference, and adjusting the duty cycle of the electric oven inner pot based on the second temperature difference;

[0078] If not, it is determined whether the first temperature difference is greater than a first dynamic preset temperature of a preset multiple.

[0079] In this embodiment, after obtaining the first temperature difference, a check is first performed to determine whether the first temperature difference is less than 0. If so, the difference between the second dynamic preset temperature and the actual temperature is used as the second temperature difference. The duty cycle of the electric oven is further adjusted based on the second temperature difference. If not, a determination is made as to whether the first temperature difference is greater than a preset multiple of the first dynamic preset temperature for further confirmation.

[0080] In order to adjust the actual duty cycle, in some embodiments of the present application, the controller is configured as follows:

[0081] Determine whether the second temperature difference is less than 0;

[0082] If so, determining whether the second temperature difference is less than a second dynamic preset temperature by a preset multiple;

[0083] If not, after the accumulated time reaches the first timing, the actual duty cycle of the electric oven inner pot is adjusted according to the first timing and the delay time.

[0084] In this embodiment, when adjusting the duty cycle of the electric oven inner pot based on the second temperature difference, it is first determined whether the second temperature difference is less than 0. If so, it is determined whether the second temperature difference is less than the second dynamic preset temperature of the preset multiple. The preset multiple can be determined according to actual conditions. In this embodiment, the preset multiple is 0.1, that is, 0.1 times the second dynamic preset temperature; if not, the time is accumulated, and after the accumulated time reaches the first timing, the actual duty cycle of the electric oven inner pot is adjusted according to the first timing and the delay time.

[0085] In order to adjust the actual duty cycle, in some embodiments of the present application, the controller is configured as follows:

[0086] When the first timing is less than the delay time, adjusting the actual duty cycle to 100%;

[0087] When the first timing is greater than or equal to the delay time, determining the actual duty cycle according to a second formula and the target duty cycle;

[0088] The second formula is μ=μ0%+ΔT2%, where μ is the actual duty cycle, μ0 is the target duty cycle, and ΔT2 is the second temperature difference.

[0089] In this embodiment, when the actual duty cycle of the electric oven inner pot is adjusted according to the first timing and the delay time, if the first timing is less than the delay time in the preset temperature rise curve, the actual duty cycle is adjusted to 100%; when the first timing is greater than or equal to the delay time, the actual duty cycle is determined according to a second formula and the target duty cycle; wherein the second formula is μ=μ0%+ΔT2%, μ is the actual duty cycle, μ0 is the target duty cycle, and ΔT2 is the second temperature difference.

[0090] In order to adjust the actual duty cycle, in some embodiments of the present application, the controller is configured as follows:

[0091] When the second temperature difference is less than a second dynamic preset temperature of a preset multiple, adjusting the actual duty cycle to a minimum duty cycle;

[0092] When the second temperature difference is greater than or equal to a second dynamic preset temperature of a preset multiple, the actual duty cycle is determined according to the second formula and the target duty cycle.

[0093] In this embodiment, when adjustment is performed through the second temperature difference, when the second temperature difference is less than the second dynamic preset temperature of the preset multiple, the actual duty cycle is adjusted to the lowest duty cycle; when the second temperature difference is greater than or equal to the second dynamic preset temperature of the preset multiple, it is necessary to further determine the actual duty cycle based on the second formula and the target duty cycle.

[0094] In order to adjust the actual duty cycle, in some embodiments of the present application, the controller is configured as follows:

[0095] When the first temperature difference is greater than a first dynamic preset temperature of a preset multiple, adjusting the actual duty cycle to 100%;

[0096] When the first temperature difference is not greater than a first dynamic preset temperature of a preset multiple and the duty cycle of the previous cycle is not 100%, determining the actual duty cycle based on a first formula;

[0097] When the first temperature difference is not greater than a first dynamic preset temperature of a preset multiple and the duty cycle of the previous cycle is 100%, after the accumulated time reaches a second timing, the actual duty cycle of the electric oven inner container is adjusted according to the second timing and the delay time;

[0098] The first formula is μ=μ0%+ΔT1%, where μ is the actual duty cycle, μ0 is the target duty cycle, and ΔT1 is the first temperature difference.

[0099] In this embodiment, if the first temperature difference is greater than the first dynamic preset temperature by a preset multiple, the actual duty cycle is directly adjusted to 100%; when the first temperature difference is not greater than the first dynamic preset temperature by a preset multiple and the duty cycle of the previous cycle is not 100%, the actual duty cycle is determined based on the first formula; when the first temperature difference is not greater than the first dynamic preset temperature by a preset multiple and the duty cycle of the previous cycle is 100%, the time is accumulated, and after the accumulated time reaches a second timing, the actual duty cycle of the electric oven inner pot is adjusted according to the second timing and the delay time in the preset temperature rise curve; wherein, the first formula is μ=μ0%+ΔT1%, μ is the actual duty cycle, μ0 is the target duty cycle, and ΔT1 is the first temperature difference.

[0100] In order to adjust the actual duty cycle, in some embodiments of the present application, the controller is configured as follows:

[0101] The controller is configured to:

[0102] Determining whether the second timing is less than the delay time;

[0103] If yes, adjusting the actual duty cycle based on a third formula;

[0104] If not, adjusting the duty cycle of the electric oven inner container based on the second temperature difference;

[0105] The third formula is μ=μ0%+0.1T1%, where μ is the actual duty cycle, μ0 is the target duty cycle, and T1 is the first dynamic preset temperature.

[0106] In this embodiment, when adjusting the actual duty cycle of the electric oven inner pot by the second timing and the delay time, it is first determined whether the second timing is less than the delay time; if so, the actual duty cycle is adjusted based on a third formula; if not, the duty cycle of the electric oven inner pot is adjusted again by the second temperature difference, wherein the third formula is μ=μ0%+0.1T1%, μ is the actual duty cycle, μ0 is the target duty cycle, and T1 is the first dynamic preset temperature.

[0107] By applying the above technical solution, in an electric oven including an electric oven inner pot, a sensor and a controller, the controller is configured to: obtain a preset temperature input by a user, and based on the preset temperature, obtain a first dynamic preset temperature corresponding to the preset temperature in a heating stage and a second dynamic preset temperature corresponding to the preset temperature in a stabilization stage; obtain a target duty cycle based on the second dynamic preset temperature and the limit value of a preset temperature rise curve; use the difference between the first dynamic preset temperature and the actual temperature as a first temperature difference, and adjust the actual duty cycle of the electric oven inner pot based on the first temperature difference and the target duty cycle, predict the change in the center temperature of the oven through the value change of the sensor and the selected mode, and keep the duty cycle non-zero, thereby reducing the delay of heat conduction when the oven is in operation, thereby significantly reducing the temperature fluctuation of the oven and lowering the difference between the center temperature of the oven and the set temperature.

[0108] The embodiment of the present application provides an electric oven inner tank temperature control method, which is applied to an electric oven including a refrigerant circulation loop, an outdoor heat exchanger and an indoor heat exchanger, an infrared thermopile sensor, a detected frame counter, an undetected frame counter and a controller. Figure 2 As shown, the method includes:

[0109] Step S201 : obtaining a preset temperature input by a user, and obtaining, based on the preset temperature, a first dynamic preset temperature corresponding to the preset temperature in a heating phase and a second dynamic preset temperature corresponding to the preset temperature in a stabilization phase.

[0110] The actual temperature of the inner container of the electric oven is collected by the sensor, and the second dynamic preset temperature corresponding to the stable stage and the first dynamic preset temperature corresponding to the heating stage are queried according to the preset temperature input by the user.

[0111] Step S202 : obtaining a target duty cycle based on the second dynamic preset temperature and a limit value of a preset temperature rise curve.

[0112] The target duty cycle of the electric oven is determined according to the second dynamic preset temperature and a pre-tested preset temperature rise curve.

[0113] Step S203: taking the difference between the first dynamic preset temperature and the actual temperature as a first temperature difference, and adjusting the actual duty cycle of the electric oven inner pot based on the first temperature difference and the target duty cycle.

[0114] The actual duty cycle of the electric oven is adjusted by the first temperature difference and the target duty cycle, thereby reducing the delay of heat conduction when the oven is in operation, greatly reducing the temperature fluctuation of the oven, and lowering the difference between the center temperature of the oven and the set temperature, thereby improving the user experience. The first temperature difference is the difference between the first dynamic preset temperature and the actual temperature.

[0115] In order to further illustrate the technical idea of ​​the present invention, the technical solution of the present invention is now described in combination with specific application scenarios.

[0116] like Figure 3 FIG. 1 is a flow chart of a method for controlling the temperature of an inner container of an electric oven according to an embodiment of the present invention. The method specifically includes:

[0117] S1: Obtain the user preset temperature T0. Based on T0 and the operating mode, calculate the dynamic preset temperatures T1 and T2, with T1 applied during the heating phase and T2 during the stabilization phase. Calculate the target duty cycle μ0 as (T2-tRoom) / (KtRoom)*100%. Query the sensor temperature range corresponding to this temperature during the stabilization phase. If it is between t16' and t17', calculate (T0-t16')*(t17-t16) / (t17'-t16')+t16, and record the result as T1. Throughout the heating process, if the preset temperature remains unchanged, T1 remains unchanged. The temperature corresponding to this temperature during the heating phase is calculated using the same method, resulting in T2. ​​The relative sizes of T1 and T2 do not affect the overall control process.

[0118] S2: Detect the current sensor temperature T3 of the oven, subtract T3 from the dynamic preset temperature T1 during the heating phase, and obtain the difference ΔT;

[0119] S3: If ΔT is less than 0, proceed to S4; if ΔT is greater than or equal to 0, proceed to S9;

[0120] S4: Subtract T3 from the dynamic preset temperature T2 in the stable phase to obtain a new difference ΔT. If ΔT is still less than 0, proceed to S5. If ΔT is greater than or equal to 0, proceed to S8.

[0121] S5: Determine whether ΔT (negative value) is less than 0.1 times T2. If so, proceed to S6. If ΔT is greater than or equal to 0.1 times T2, proceed to S7.

[0122] S6: Duty cycle μ operates at a minimum duty cycle of 1%;

[0123] S7: According to the target duty cycle μ0, the current duty cycle is adjusted to μ0%+ΔT% (negative value) (if the result is less than or equal to 1%, the value is 1%). When the next relay operation cycle comes, μ is adjusted again according to ΔT.

[0124] S8: Start timing t8. When t8 is less than τ, the duty cycle is 100%. When t8 is greater than or equal to τ, adjust the current duty cycle to μ0%+ΔT% according to the target duty cycle μ.

[0125] S9: ΔT is greater than 0. If ΔT is greater than 0.1 times T1, proceed to S10; if ΔT is less than or equal to 0.1 times T1, proceed to S11;

[0126] S10: The current duty cycle is adjusted to 100%, full heating;

[0127] S11: ΔT is less than or equal to 0.1 times T1. If the duty cycle μt of the previous cycle is 100%, proceed to S12. If it is less than 100%, proceed to S13.

[0128] S12: When S12 starts to be executed, the timing t12 is performed. When t12 is less than τ, the duty cycle is adjusted to μ0%+0.1T1%. When t12 is greater than or equal to τ, S4 is executed;

[0129] S13: Adjust the current duty cycle to μ0%+ΔT%.

[0130] When the preset time is reached, the entire heating process ends.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric oven, characterized in that: include: Electric oven liner; A sensor for detecting the actual temperature of the inner container of the electric oven; The controller is configured as: Obtaining a preset temperature input by a user, and based on the preset temperature, obtaining a first dynamic preset temperature corresponding to the preset temperature in a heating phase and a second dynamic preset temperature corresponding to the preset temperature in a stabilization phase; Obtaining a target duty cycle based on the second dynamic preset temperature and a limit value of a preset temperature rise curve; taking the difference between the first dynamic preset temperature and the actual temperature as a first temperature difference, and adjusting the actual duty cycle of the electric oven inner pot based on the first temperature difference and the target duty cycle; The steps for obtaining the preset temperature rise curve are specifically as follows: A temperature measuring point is set at the center of the electric oven; Controlling the electric oven to operate in a test mode with the heating tubes fully open, so that the electric oven heats up at full speed; When the temperature at the temperature measurement point tends to be stable, obtaining a preset temperature rise curve of the electric oven and obtaining parameter values ​​of the preset temperature rise curve, the parameter values ​​including a limit value of the curve, a limit time when the temperature rise value is 0.632 times the limit value, and a delay time of the center temperature response; The target duty cycle is obtained based on the second dynamic preset temperature and the limit value of the preset temperature rise curve by the following formula: μ0=(T2-troom temperature) / (Ktroom temperature)*100%; Wherein, μ0 is the target duty cycle, T2 is the second dynamic preset temperature, K is the limit value, and troom is the indoor temperature.

2. The electric oven according to claim 1, wherein: The controller is specifically configured to: Determining whether the first temperature difference is less than 0; If yes, taking the difference between the second dynamic preset temperature and the actual temperature as a second temperature difference, and adjusting the duty cycle of the electric oven inner pot based on the second temperature difference; If not, it is determined whether the first temperature difference is greater than a first dynamic preset temperature of a preset multiple.

3. The electric oven according to claim 2, characterized in that: The controller is configured to: Determine whether the second temperature difference is less than 0; If so, determining whether the second temperature difference is less than a second dynamic preset temperature by a preset multiple; If not, after the accumulated time reaches the first timing, the actual duty cycle of the electric oven inner pot is adjusted according to the first timing and the delay time.

4. The electric oven according to claim 3, characterized in that: The controller is configured to: When the first timing is less than the delay time, adjusting the actual duty cycle to 100%; When the first timing is greater than or equal to the delay time, determining the actual duty cycle according to a second formula and the target duty cycle; The second formula is μ=μ0%+ΔT2%, where μ is the actual duty cycle, μ0 is the target duty cycle, and ΔT2 is the second temperature difference.

5. The electric oven according to claim 3-4, characterized in that: The controller is configured to: When the second temperature difference is less than a second dynamic preset temperature of a preset multiple, adjusting the actual duty cycle to a minimum duty cycle; When the second temperature difference is greater than or equal to a second dynamic preset temperature of a preset multiple, the actual duty cycle is determined according to the second formula and the target duty cycle.

6. The electric oven according to claim 2, characterized in that: The controller is configured to: When the first temperature difference is greater than a first dynamic preset temperature of a preset multiple, adjusting the actual duty cycle to 100%; When the first temperature difference is not greater than a first dynamic preset temperature of a preset multiple and the duty cycle of the previous cycle is not 100%, determining the actual duty cycle based on a first formula; When the first temperature difference is not greater than a first dynamic preset temperature of a preset multiple and the duty cycle of the previous cycle is 100%, after the accumulated time reaches a second timing, the actual duty cycle of the electric oven inner container is adjusted according to the second timing and the delay time; The first formula is μ=μ0%+ΔT1%, where μ is the actual duty cycle, μ0 is the target duty cycle, and ΔT1 is the first temperature difference.

7. The electric oven according to claim 2 or 6, characterized in that: The controller is configured to: Determining whether the second timing is less than the delay time; If yes, adjusting the actual duty cycle based on a third formula; If not, adjusting the duty cycle of the electric oven inner container based on the second temperature difference; The third formula is μ=μ0%+0.1T1%, where μ is the actual duty cycle, μ0 is the target duty cycle, and T1 is the first dynamic preset temperature.

8. A method for controlling the temperature of an electric oven liner, characterized in that: Applied to an electric oven comprising an electric oven inner container, a sensor and a controller, the method comprises: Obtaining a preset temperature input by a user, and based on the preset temperature, obtaining a first dynamic preset temperature corresponding to the preset temperature in a heating phase and a second dynamic preset temperature corresponding to the preset temperature in a stabilization phase; Obtaining a target duty cycle based on the second dynamic preset temperature and a limit value of a preset temperature rise curve; The difference between the first dynamic preset temperature and the actual temperature is used as a first temperature difference, and the actual duty cycle of the electric oven inner pot is adjusted based on the first temperature difference and the target duty cycle.

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