WO2024082241A1

WO2024082241A1 - Combi steamer and heating/cooling control method thereof

Info

Publication number: WO2024082241A1
Application number: PCT/CN2022/126537
Authority: WO
Inventors: 黄战彬; 谢瑞; 朱良
Original assignee: 深圳市虎一科技有限公司
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2024-04-25

Abstract

A combi steamer and a heating/cooling control method thereof. The method comprises: acquiring a first measured temperature value in a cavity (110) in a combi steamer by means of a first temperature sensor (510), the cavity (110) being used for accommodating food materials; acquiring a second measured temperature value in the cavity (110) by means of a second temperature sensor (520), wherein in a first temperature measurement sensitive range, the measurement precision of the first temperature sensor is higher than the measurement precision of the second temperature sensor, and in a second temperature measurement sensitive range different from the first temperature measurement sensitive range, the measurement precision of the second temperature sensor (520) is higher than the measurement precision of the first temperature sensor; and determining an actual temperature in the cavity (110) according to at least one of the first measured temperature value and the second measured temperature value, and controlling the heating and/or cooling of the cavity (110) according to the actual temperature. The combi steamer can obtain a more accurate actual temperature according to the two measured temperature values, and heating or cooling performed on the basis of the actual temperature can bring a better cooking effect.

Description

A steam oven and heating and cooling control method thereof

Technical Field

The invention relates to the technical field of cooking, and in particular to a steam oven and a heating and cooling control method thereof.

Background technique

With the improvement of people's quality of life, steam ovens are more and more widely used in various public places and households. When cooking food in steam ovens, different foods and different processing processes have very different temperature requirements in the steam ovens. Obtaining an accurate temperature is crucial for the heating function of traditional steam ovens.

At present, most steam ovens use a temperature sensor to detect the temperature inside the steam oven. Some steam ovens improve the measurement accuracy of the temperature sensor through algorithm compensation, error elimination and other means. However, some problems also arise. First, the amount of calculation through algorithm compensation and other means is large. Second, with the improvement of food processing methods, the temperature variation range in the steam oven is getting larger and larger, and even the steam oven has a refrigeration function. The current temperature detection method is difficult to meet the needs of steam ovens that can realize heating and cooling functions.

Summary of the invention

The present invention provides a steam oven and a heating and cooling control method thereof, wherein the steam oven and the heating and cooling control method thereof can obtain an accurate actual temperature when the temperature variation range in the steam oven is large, and perform heating and/or cooling based on the actual temperature.

According to the first aspect, an embodiment provides a steam oven, comprising:

A box body having a cavity for containing food and an opening connecting the outside with the cavity;

A door, which is used to open and close the opening;

A heating device, the heating device is used to increase the temperature in the cavity;

A refrigeration device, the refrigeration device is used to reduce the temperature in the cavity;

A temperature detection device, the temperature detection device comprising a first temperature sensor and a second temperature sensor, the first temperature sensor being used to obtain a first temperature measurement value in the cavity, the second temperature sensor being used to obtain a second temperature measurement value in the cavity, the measurement accuracy of the first temperature sensor being higher than the measurement accuracy of the second temperature sensor within a first temperature measurement sensitive range, and the measurement accuracy of the second temperature sensor being higher than the measurement accuracy of the first temperature sensor within a second temperature measurement sensitive range different from the first temperature measurement sensitive range;

A control device is used to determine the actual temperature in the cavity according to at least one of the first temperature measurement value and the second temperature measurement value, and control the heating device and/or the refrigeration device according to the actual temperature.

According to the second aspect, an embodiment provides a steam oven, comprising:

A door, which is used to open and close the opening;

a temperature detection device, the temperature detection device comprising a first temperature sensor and a second temperature sensor, the first temperature sensor being used to obtain a first temperature measurement value in the cavity, the second temperature sensor being used to obtain a second temperature measurement value in the cavity, a first curve of resistance variation with temperature of the first temperature sensor being different from a second curve of resistance variation with temperature of the second temperature sensor;

According to a third aspect, an embodiment provides a steam oven, comprising:

A door, which is used to open and close the opening;

a temperature detection device, the temperature detection device comprising a first temperature sensor and a second temperature sensor, the first temperature sensor being used to obtain a first temperature measurement value in the cavity, and the second temperature sensor being used to obtain a second temperature measurement value in the cavity;

a control device, configured to obtain a temperature control mode set for the cavity, the temperature control mode comprising a heating mode and a cooling mode, and when the temperature control mode is the heating mode, determining the first temperature measurement value as the actual temperature in the cavity, and when the temperature control mode is the cooling mode, determining the second temperature measurement value as the actual temperature in the cavity;

The heating device is controlled and/or the cooling device is controlled according to the actual temperature.

According to a fourth aspect, an embodiment provides a steam oven, comprising:

A door, which is used to open and close the opening;

A temperature detection device, wherein the temperature detection device comprises at least two temperature sensors, each of which is used to obtain a temperature measurement value in the cavity, each of which has a corresponding temperature measurement sensitive range, and the measurement accuracy of each temperature sensor within the corresponding temperature measurement sensitive range is higher than the measurement accuracy of other temperature sensors, and the temperature measurement sensitive ranges corresponding to different temperature sensors do not intersect;

A control device is used to determine the actual temperature in the cavity according to the temperature measurement value of the at least one temperature sensor, and control the heating device and/or the refrigeration device according to the actual temperature.

According to a fifth aspect, an embodiment provides a heating and cooling control method for a steam oven, comprising:

Acquiring a first temperature measurement value in a cavity of a steam oven through a first temperature sensor, wherein the cavity is used to contain food;

obtaining a second temperature measurement value in the cavity through a second temperature sensor, wherein within a first temperature measurement sensitive range, a measurement accuracy of the first temperature sensor is higher than a measurement accuracy of the second temperature sensor, and within a second temperature measurement sensitive range different from the first temperature measurement sensitive range, a measurement accuracy of the second temperature sensor is higher than a measurement accuracy of the first temperature sensor;

An actual temperature in the cavity is determined based on at least one of the first temperature measurement value and the second temperature measurement value, and heating and/or cooling of the cavity is controlled based on the actual temperature.

According to a sixth aspect, an embodiment provides a heating and cooling control method for a steam oven, comprising:

obtaining a second temperature measurement value in the cavity by a second temperature sensor, wherein a first curve of resistance variation with temperature of the first temperature sensor is different from a second curve of resistance variation with temperature of the second temperature sensor;

According to the seventh aspect, an embodiment provides a heating and cooling control method for a steam oven, comprising:

Acquire a temperature control mode set for the cavity, the temperature control mode including a heating mode and a cooling mode, and when the temperature control mode is the heating mode, determine the first temperature measurement value as the actual temperature in the cavity, and when the temperature control mode is the cooling mode, determine the second temperature measurement value as the actual temperature in the cavity;

The heating and/or cooling of the cavity is controlled according to the actual temperature.

According to the eighth aspect, an embodiment provides a heating and cooling control method for a steam oven, comprising:

The temperature measurement value in the inner cavity of the steam oven is obtained by each of the at least two temperature sensors, each of the temperature sensors has a corresponding temperature measurement sensitive range, the measurement accuracy of each temperature sensor in the corresponding temperature measurement sensitive range is higher than the measurement accuracy of other temperature sensors, and the temperature measurement sensitive ranges corresponding to different temperature sensors do not intersect;

The actual temperature in the cavity is determined according to the temperature measurement value of the at least one temperature sensor, and the heating and/or cooling of the cavity is controlled according to the actual temperature.

According to the ninth aspect, an embodiment provides a computer-readable storage medium, on which a program is stored, and the program can be executed by a processor to implement the above method.

According to the steam oven of the above embodiment, at least two temperature sensors are used to obtain the temperature measurement value in the cavity, so that at least two temperature measurement values can be provided at the same time. Each temperature sensor has its own most accurate temperature measurement sensitivity range, and different temperature sensors have different temperature measurement sensitivity ranges. Therefore, at different temperatures, each of the at least two temperature measurement values has a corresponding degree of credibility. Comprehensively considering the two temperature measurement values can obtain a more accurate actual temperature in the cavity, and heating or cooling based on this actual temperature can bring better cooking effects.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a structural block diagram of a steam oven according to an embodiment;

FIG2 is a schematic structural diagram of a steam oven according to an embodiment;

FIG3 is a front schematic diagram of a steam oven according to an embodiment;

FIG4 is a schematic structural diagram of a refrigeration device according to an embodiment;

FIG5 is a flow chart of a heating and cooling control method for a steam oven according to an embodiment;

FIG6 is a flow chart of a heating and cooling control method of a steam oven according to another embodiment;

100, box body;

110, cavity; 120, access opening;

111. Air guide port;

200, box door;

300, heating device; 310, heating tube;

400. Refrigeration equipment;

410, housing; 420, valve; 430, semiconductor refrigeration module; 440, fan; 450, gas channel; 460, refrigeration fin;

500. Temperature detection device;

510, a first temperature sensor; 520, a second temperature sensor; 530, a third temperature sensor;

600. Control device.

Detailed ways

The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

The temperature variation range of current steam ovens is getting larger and larger, but there are very few steam ovens that can also be cooled. Therefore, technicians in this field have not realized the impact of the large temperature variation range on the hardware obtaining temperature measurement values. The most important concept of this application is that the inventor has keenly discovered another reason that is easy to cause errors in temperature measurement values in the development of current steam ovens, and solved this technical problem at a relatively low cost.

The standard temperature measuring instrument referred to in this article refers to a standard instrument that has been calibrated and can obtain accurate temperature measurement values within its measurement range.

The semiconductor cooling sheet referred to in this article is based on the Peltier effect, so that the effect of cooling or heating can be achieved. The principle of cooling or refrigeration is that when an electric current passes through two connected conductors, a temperature difference will be generated at the connection, that is, the connection will absorb and release heat. This effect was discovered by the Frenchman Jean-Charles Peltier in 1834. The amount of heat absorbed and released in the Peltier effect is determined by the magnitude of the current. People have manufactured cooling and heating elements based on the Peltier effect, such as the Peltier cooling and heating sheet. When the Peltier cooling and heating sheet is powered on, one side absorbs heat (cooling) and the other side releases heat (heating). The heat absorption surface and the heat release surface can be changed by changing the direction of the current.

Please refer to FIG. 1 to FIG. 4 , in the embodiments shown in the figures, a steam oven is provided, which includes a box body 100 , a box door 200 , a heating device 300 , a refrigeration device 400 , a temperature detection device 500 and a control device 600 .

The box body 100 has a cavity 110 for accommodating food and an access opening 120 communicating the outside with the cavity 110 . A user can access food or tools such as a baking tray through the access opening 120 .

The box door 200 is movably connected to the box body 100, specifically, it can be rotatably connected by a hinge connection or other methods, or it can be linearly connected by other methods. The box door 200 has an open state and a closed state. When the box door 200 is in the open state, the access opening 120 is opened, and when the box door 200 is in the closed state, the access opening 120 is closed.

The heating device 300 is used to increase the temperature in the cavity 110, that is, to realize the baking function of the steam oven. The heating device 300 may include one or more heating tubes 310 located in the cavity 110, which heat the cavity 110 by emitting heat radiation. In some embodiments, when there are multiple heating tubes 310, the multiple heating tubes 310 are distributed on the top wall and side walls of the cavity 110 to heat the food from multiple angles in all directions. In other embodiments, the multiple heating tubes 310 can also be distributed at other positions of the cavity 110.

The refrigeration device 400 is used to reduce the temperature in the cavity 110, that is, to realize the refrigeration function of the steam oven, and the refrigeration function can be used in the scenario of low-temperature cooking of food. In order to cooperate with the refrigeration device 400, two air guide ports 111 are also provided on the same side wall of the cavity 110. When the refrigeration device 400 is working, the air in the cavity 110 is sucked into the refrigeration device 400 from one air guide port 111 for cooling, and the cooled air enters the cavity 110 from the other air guide port 111, thereby reducing the temperature in the cavity 110. In other embodiments, the two air guide ports 111 may not be on the same side wall, and more than two air guide ports 111 may be provided on the cavity 110, at least one of which is used to receive the air in the cavity 110, and at least another one is used to exhaust air into the cavity 110.

As shown in FIG. 4 , the refrigeration device 400 includes a housing 410 , a valve 420 corresponding to the air guide port 111 , a semiconductor refrigeration module 430 , and a fan 440 .

The shell 410 is arranged on one side of the box body 100, and a gas channel 450 connecting two air ducts 111 is provided in the shell 410. The valve 420 is arranged at the corresponding air duct 111. The valve 420 can close and open the corresponding air duct 111 to conduct or isolate the gas channel 450 and the cavity 110. It is easy to understand that when the cavity 110 is heated, each valve 420 closes the corresponding air duct 111.

The semiconductor refrigeration module 430 has a hot end and a cold end. The cold end of the semiconductor refrigeration module 430 is used to cool the gas channel 450, and the hot end of the semiconductor refrigeration module 430 is used to discharge heat to the outside of the box 100. The semiconductor refrigeration module 430 includes at least a semiconductor refrigeration sheet, and may also include necessary components such as a heat conducting plate. The semiconductor refrigeration technology is a mature technology at present, and will not be described in detail here.

The fan 440 is disposed in the gas channel 450 . When the fan 440 rotates, it inhales gas from the cavity 110 through one air guide port 111 and delivers gas to the cavity 110 through another air guide port 111 .

In this embodiment, the temperature detection device 500 includes a first temperature sensor 510 and a second temperature sensor 520. The first temperature sensor 510 is used to obtain a first temperature measurement value in the cavity 110, and the second temperature sensor 520 is used to obtain a second temperature measurement value in the cavity 110. The first temperature sensor 510 and the second temperature sensor 520 themselves have the following differences: the measurement accuracy of the first temperature sensor 510 is higher than the measurement accuracy of the second temperature sensor 520 in the first temperature measurement sensitive range, and the measurement accuracy of the second temperature sensor 520 is higher than the measurement accuracy of the first temperature sensor 510 in the second temperature measurement sensitive range different from the first temperature measurement sensitive range. For example, the first temperature measurement sensitive range is 100°C to 200°C, and the second temperature measurement sensitive range is 30°C to 80°C. In the first temperature measurement sensitive range, the first temperature measurement value obtained by the first temperature sensor 510 is more accurate, and in the second temperature measurement sensitive range, the second temperature measurement value obtained by the second temperature sensor 520 is more accurate. It should be noted that the temperature measurement sensitive range is different from the temperature measurement range of the temperature sensor, and the first temperature sensor 510 and the second temperature sensor 520 can have the same temperature measurement range.

In some embodiments, the measurement accuracy in different temperature measurement sensitive ranges can be reflected by the error between the first temperature measurement value and the reading of the standard temperature measuring instrument, that is, within the first temperature measurement sensitive range, the difference between the first temperature measurement value and the reading of the standard temperature measuring instrument is smaller than the difference between the second temperature measurement value and the reading of the standard temperature measuring instrument, and within the second temperature measurement sensitive range, the difference between the second temperature measurement value and the reading of the standard temperature measuring instrument is smaller than the difference between the first temperature measurement value and the reading of the standard temperature measuring instrument.

In some embodiments, when the first temperature sensor 510 and the second temperature sensor 520 are both resistive sensors, the measurement accuracy in different temperature measurement sensitivity ranges can be distinguished by the curve of resistance changing with temperature, that is, the first curve of resistance changing with temperature of the first temperature sensor 510 is different from the second curve of resistance changing with temperature of the second temperature sensor 520.

For the convenience of explanation and understanding, the lowest temperature value of the first temperature measurement sensitive range referred to below is greater than the highest temperature value of the second temperature measurement sensitive range, that is, the two temperature measurement sensitive ranges have no intersection and the first temperature measurement sensitive range is higher. On this basis, the positions of the first temperature sensor 510 and the second temperature sensor 520 in the cavity 110 are also designed. It can be understood that the first temperature measurement sensitive range and the second temperature measurement sensitive range may also have an intersection or at least partially overlap. In addition, in this article, when the highest temperature value in the second temperature measurement sensitive range is less than the highest temperature value in the first temperature measurement sensitive range, it is defined that the second temperature measurement sensitive range is lower than the first temperature measurement sensitive range. It is easy to understand that for the same cavity 110, the speed of heating at different positions in the cavity 110 may also be different. The cavity 110 includes a first heating area and a second heating area. When the heating device 300 is working, the heating speed of the first heating area is faster than that of the second heating area. The first temperature sensor 510 is located in the first heating area, and the second temperature sensor 520 is located in the second heating area. Through this design, each temperature sensor can measure the temperature at a suitable position, that is, a temperature sensor that is more accurate at high temperature measures the temperature in the high temperature area, and a temperature sensor that is more accurate at low temperature measures the temperature in the low temperature area. Of course, low temperature and high temperature here are relative concepts.

The control device 600 is used to determine the actual temperature in the cavity 110 according to at least one of the first temperature measurement value and the second temperature measurement value, and control the heating device 300 and the cooling device 400 according to the actual temperature.

It can be understood that in “determine the actual temperature in the cavity according to at least one of the first temperature measurement value and the second temperature measurement value, and control the heating device and/or control the refrigeration device according to the actual temperature”, the “actual temperature” is introduced only for the convenience of describing the temperature measurement value used to control the heating device 300 and/or the refrigeration device 400 later. In some embodiments, “determine the actual temperature in the cavity according to at least one of the first temperature measurement value and the second temperature measurement value, and control the heating device and/or control the refrigeration device according to the actual temperature” means “control the heating device and/or control the refrigeration device according to at least one of the first temperature measurement value and the second temperature measurement value”, that is, which temperature measurement value is selected for relevant control, that is, which temperature measurement value is selected as the actual temperature, and then relevant control is performed according to the actual temperature.

In some embodiments, after obtaining the first temperature measurement value and the second temperature measurement value, the control device 600 compares the first temperature measurement value and/or the second temperature measurement value with the second temperature measurement sensitive range. When the first temperature measurement value and/or the second temperature measurement value are within the second temperature measurement sensitive range, the second temperature measurement value is determined as the actual temperature, or the heating device 300 and/or the refrigeration device 400 is controlled according to the second temperature measurement value; when the first temperature measurement value and/or the second temperature measurement value are not within the second temperature measurement sensitive range, the first temperature measurement value is determined as the actual temperature, or the heating device 300 and/or the refrigeration device 400 is controlled according to the first temperature measurement value.

In some embodiments, after obtaining the first temperature measurement value and the second temperature measurement value, the control device 600 compares the first temperature measurement value and/or the second temperature measurement value with the second temperature measurement sensitive range. When the first temperature measurement value and/or the second temperature measurement value are within the second temperature measurement sensitive range, the second temperature measurement value is determined as the actual temperature. If the first temperature measurement value and/or the second temperature measurement value are not within the second temperature measurement sensitive range, the first temperature measurement value and/or the second temperature measurement value are compared with the first temperature measurement sensitive range. When the first temperature measurement value and/or the second temperature measurement value are within the first temperature measurement sensitive range, the first temperature measurement value is determined as the actual temperature. When the first temperature measurement value and/or the second temperature measurement value are neither within the second temperature measurement sensitive range nor within the first temperature measurement sensitive range, the first temperature measurement value and the second temperature measurement value need to be combined to determine the actual temperature. In some embodiments, the method for determining the actual temperature by combining the first temperature measurement value and the second temperature measurement value can be: multiplying the first weight coefficient by the first temperature measurement value, multiplying the second weight coefficient by the second temperature measurement value, and then adding the two products to obtain the actual temperature, wherein the first weight coefficient and the second weight coefficient can be obtained based on experience.

In some embodiments, after obtaining the first temperature measurement value and the second temperature measurement value, the control device 600 compares the second temperature measurement value with the second temperature measurement sensitive range. When the second temperature measurement value is within the second temperature measurement sensitive range, the second temperature measurement value is determined as the actual temperature. When the second temperature measurement value is not within the second temperature measurement sensitive range, the first temperature measurement value is compared with the first temperature measurement sensitive range. When the first temperature measurement value is within the first temperature measurement sensitive range, the first temperature measurement value is determined as the actual temperature. When the second temperature measurement value is not within the second temperature measurement sensitive range and the first temperature measurement value is also not within the first temperature measurement sensitive range, it is necessary to combine the first temperature measurement value and the second temperature measurement value to determine the actual temperature.

In some embodiments, the logic of determining the actual temperature is to first check whether the reading of the temperature sensor (second temperature sensor 520) corresponding to the low temperature is credible. When the second temperature measurement value is within the second temperature measurement sensitive range, it indicates that it is credible, and the reading of the temperature sensor is directly used. When the second temperature measurement value is not within the second temperature measurement sensitive range, it indicates that it is unreliable. Then check whether the reading of the temperature sensor (first temperature sensor 510) corresponding to the high temperature is credible. If it is credible, the reading of the temperature sensor is directly used. If it is unreliable, the readings of the two temperature sensors are not directly used. In some embodiments, the method of combining the first temperature measurement value and the second temperature measurement value to determine the actual temperature can be: multiplying the first weight coefficient with the first temperature measurement value, multiplying the second weight coefficient with the second temperature measurement value, and then adding the two products to obtain the actual temperature, wherein the first weight coefficient and the second weight coefficient can be obtained based on experience. In addition, the above process of determining the actual temperature is confirmed from low temperature to high temperature. In other embodiments, it can also be confirmed from high temperature to low temperature, that is, first comparing the first temperature measurement value with the first temperature measurement sensitive range. When the first temperature measurement value is within the first temperature measurement sensitive range, the first temperature measurement sensitive range is directly used as the actual temperature.

In some embodiments, when determining which temperature measurement value to select for relevant control, the control device 600 can also control the steam oven to display the temperature measurement value. For example, when the first temperature measurement value is used to control the heating device 300, the first temperature measurement value is also displayed at the same time, so that the user can understand which temperature measurement value is currently used for control.

In some embodiments, the steam oven has two temperature control modes, namely, a heating mode and a cooling mode, and the user can choose to enable the heating mode or the cooling mode. When the user chooses to enter the heating mode, the control device 600 determines the first temperature measurement value as the actual temperature in the cavity 110, and when the user chooses to enter the cooling mode, the control device 600 determines the second temperature measurement value as the actual temperature in the cavity 110. The steam oven can provide a clear mode selection button for the user to choose which mode to enter, and can also determine which mode the user has chosen to enter by the user choosing to start the heating device 300 or the cooling device 400.

It is understandable that in some embodiments, the temperature measurement value used for display and the temperature measurement value used for controlling the heating device 300 and/or the refrigeration device 400 may be different. In some embodiments, when in the heating mode, the first temperature measurement value and/or the second temperature measurement value are within the second temperature measurement sensitive range, the second temperature measurement value is displayed, but the first temperature measurement value is still used to control the heating device 300 and/or the refrigeration device 400. This can make the displayed temperature measurement value more accurate.

In some embodiments, the heating device 300 can be controlled according to the actual temperature in an open-loop control manner. When the control device 600 detects the user's setting of the target temperature in the cavity 110, the actual temperature is compared with the target temperature, and the initial heating power and corresponding heating time of the heating device 300 are determined according to the comparison result, and then the heating device 300 is controlled to work at the initial heating power and heating time.

For example, when the actual temperature is 30°C and the target temperature is 70°C, the heating device 300 is controlled to heat at 2KW for 5 minutes and then stop working. When the actual temperature is 30°C and the target temperature is 110°C, the heating device 300 is controlled to heat at 2KW for 10 minutes and then stop working.

In some embodiments, the heating device 300 can be controlled according to the actual temperature in a closed-loop control manner. When the control device 600 detects the user's setting of the target temperature in the cavity 110, the actual temperature is compared with the target temperature, and then the initial heating power and corresponding heating time of the heating device 300 are determined according to the comparison result.

For example, the actual temperature is 30°C and the target temperature is 70°C. Based on the difference between the two, the initial heating power is determined to be 2KW, and the heating time is 5 minutes. The heating device 300 is controlled to start working at 2KW and start timing. During the heating and timing process, the actual temperature is compared with the target temperature. If the actual temperature rise rate is faster than expected, the heating power is reduced. If the actual temperature rise rate is slower than expected, the heating power is increased again. This process continues until the timing reaches 5 minutes.

In some embodiments, the heating device 300 can also be controlled according to the actual temperature in a staged manner. Specifically, it can include a first heating stage, a second heating stage and a third heating stage, wherein the second heating stage can have one or more. The temperature difference between the target temperature and the actual temperature is monitored in all three stages.

When the control device 600 detects the user's setting of the target temperature in the cavity 110, the heating device 300 is first controlled to enter the first heating stage. In the first heating stage, the heating device 300 is controlled to work at the first heating power, and the relationship between the temperature difference and the first threshold is obtained. When the temperature difference is greater than the first threshold, the first heating stage continues, and if the temperature difference is not greater than the first threshold, then the second heating stage is entered. In other words, when it is necessary to increase the temperature in the cavity 110, the heating device 300 is first controlled to work at the first heating power until the difference between the actual temperature and the target temperature is reduced to a certain extent before entering the next stage. The first heating power can be a certain power that is pre-set. In a preferred embodiment, the first heating power is the rated maximum power of the heating device 300, that is, after starting the heating device 300, the heating device 300 is first controlled to work at the rated maximum power to achieve rapid temperature rise. The first heating power can also be determined based on the temperature difference, for example, the greater the temperature difference between the actual temperature and the target temperature, the greater the first heating power.

In some embodiments, the comparison between the temperature difference and the first threshold value in the first heating stage is periodic, that is, the control device 600 compares the temperature difference with the first threshold value every time it controls the heating device 300 to operate at the first heating power for a preset time. If the temperature difference is greater than the first threshold value, the heating device 300 is controlled to operate at the first heating power for a preset time until the temperature difference is less than or equal to the first threshold value, then the second heating stage is entered.

The second heating stage can be one or more. Each second heating stage has a corresponding second threshold value and a second heating power.

When there is only one second heating stage, the second heating power is less than the first heating power, and the second threshold is less than the first threshold. Similar to the first heating stage, in the second heating stage, the control device 600 controls the heating device 300 to work at the second heating power, and obtains the relationship between the temperature difference and the second threshold. When the temperature difference is greater than the second threshold, the second heating stage continues, and when the temperature difference is less than the second threshold, the third heating stage is entered. In other words, a second heating stage is equivalent to a weakened first heating stage. After the heating device 300 is started, it first works at a relatively large heating power, and then reduces the heating power. If the temperature difference meets the conditions after the heating power is reduced, the third heating stage is entered.

When there are multiple second heating stages, the multiple second heating powers are all less than the first heating power, the multiple second thresholds are all less than the first threshold, and the second thresholds and second heating powers corresponding to different second heating stages are both decreasing. After entering a second heating stage, the heating device 300 works at the second heating power corresponding to the second heating stage. When the temperature difference is less than the second threshold corresponding to the second heating stage, it enters the second heating stage with smaller corresponding second heating power and second threshold, until in the last second heating stage, if the temperature difference is less than the second threshold corresponding to the second heating stage, it enters the third heating stage. That is to say, in the process of the actual temperature rising, the heating power gradually decreases in stages, and the closer to the target temperature, the smaller the heating power.

The third heating stage is a stage where the actual temperature is closest to the target temperature, and the actual temperature needs to be adjusted more finely in this stage. Specifically, in the third heating stage, the temperature difference is used as input, and the PID algorithm is used to control the third heating power of the heating device 300 when it is working, so that the actual temperature reaches or approaches the target temperature, wherein the PID algorithm is a classic control algorithm and will not be described in detail here.

Through the above three stages, the rapid rise of actual temperature, the gradual approach to the target temperature and the fine control relative to the target temperature are achieved. On the one hand, the adjustment time of the actual temperature is shortened, and on the other hand, the accuracy of temperature control is guaranteed.

In some embodiments, when there is only one second heating stage, timing is also performed when entering the second heating stage. When the timing reaches the preset first time threshold and the heating device 300 has not entered the third heating stage, the heating device 300 is controlled to directly enter the third heating stage. One of the applicable scenarios of this embodiment is that there are too many ingredients in the cavity 110, and the second heating power is too small for the excessive ingredients, which will result in a long waiting time before entering the third heating stage from the second heating stage. Therefore, a first time threshold is set. If the stay time in the second heating stage reaches the first time threshold, it is judged that it is not suitable to stay in the second heating stage at this time, but directly enter the third heating stage. Since the third heating power in the third heating stage is controlled by the PID algorithm, the heating power can be adaptively changed to adapt to the current scenario, so that the actual temperature reaches the target temperature faster.

The following example illustrates controlling the heating device 300 according to the actual temperature in stages, wherein the actual temperature is 20°C, the target temperature is 100°C, the first heating power is the rated maximum power of 2KW, the first threshold is 60°C, and the preset duration is 10 seconds; there is only one second heating stage, the second heating power is 1KW, the second threshold is 20°C, and the first time threshold is 10 minutes.

When the user sets the target temperature to 100°C, the heating device 300 operates at a heating power of 2KW for 10 seconds, and then compares whether the actual temperature has reached 40°C. If it has not reached 40°C, it operates at a heating power of 2KW for another 10 seconds, and repeats the comparison process. If it has reached 40°C, it heats with a heating power of 1KW and starts timing. If the actual temperature reaches 80°C within 10 minutes, the third heating stage is entered. If the actual temperature still has not reached 80°C after 10 minutes, the third heating stage is also entered.

In some embodiments, the control device 600 can also determine whether to issue an alarm prompt of over-temperature according to the actual temperature. For example, when the actual temperature is too high, an alarm is issued by sound, voice, light, etc. In other embodiments, the door 200 also has a lock structure. When the actual temperature is too high, the control device 600 controls the lock to close, and the user cannot open the door 200 to ensure the user's safety.

In some embodiments, when the control device 600 detects that the user has set a cooling setting in the cavity 110, it determines whether to start the cooling device 400 according to the actual temperature. The cooling setting can be triggered by the user by selecting to enter the cooling mode through a physical or virtual button. When the user sets a cooling setting in the cavity 110, the actual temperature is compared with the preset first cooling temperature threshold. When the actual temperature is higher than the first cooling temperature threshold, the cooling device 400 is started, otherwise, the cooling device 400 is stopped. In other words, cooling is performed only when the actual temperature meets certain conditions. For example, the first cooling temperature threshold is 40°C. When it is higher than 40°C, the cooling device 400 is not started to prevent the air with too high temperature in the cavity 110 from entering the gas channel 450 and damaging the cooling device 400. The process of controlling the start of the cooling device 400 can be as follows: first, the valve 420 is controlled to open the corresponding air guide port 111, and when the valve 420 is opened, the semiconductor cooling module 430 is started for cooling, and the fan 440 is controlled to rotate.

In some embodiments, during the refrigeration process, the control device 600 also determines whether to stop the operation of the refrigeration device 400 according to the actual temperature. Specifically, during the operation of the refrigeration device 400, the control device 600 compares the actual temperature with the preset second refrigeration temperature threshold. When the actual temperature is lower than the second refrigeration temperature threshold, the operation of the refrigeration device 400 is stopped, otherwise the operation of the refrigeration device 400 is not stopped. For example, the second refrigeration temperature threshold is 0°C, that is, when the actual temperature in the cavity 110 drops below zero, the refrigeration is temporarily stopped. The temporary suspension of refrigeration can be temporarily not energizing the semiconductor refrigeration module 430 and controlling the fan 440 to temporarily stop rotating. After the refrigeration device 400 is stopped, when the actual temperature is higher than the second refrigeration temperature threshold, the refrigeration device 400 is started again. In this way, the temperature in the cavity 110 can be prevented from being too low.

As described above, in some embodiments, when entering the cooling mode, the second temperature measurement value is used as the actual temperature, and the process of the control device 600 controlling the cooling device 400 to work according to the actual temperature is as follows:

After entering the cooling mode, when the reading of the second temperature sensor 520 is greater than the first cooling temperature threshold, the control device 600 controls the cooling device 400 to work. During the operation, if the reading of the second temperature sensor 520 is less than the second cooling temperature threshold, the cooling device 400 is controlled to stop working until the reading of the second temperature sensor 520 reaches or exceeds the second cooling temperature threshold, and the control device 600 controls the cooling device 400 to start working again.

In some embodiments, as shown in FIG. 4 , the refrigeration device 400 further includes a refrigeration fin 460 disposed in the gas channel 450 , and the refrigeration fin 460 is thermally connected to the cold end of the semiconductor refrigeration module 430 . In a limited space, the refrigeration fin 460 has a larger contact area with the air in the gas channel 450 , thereby achieving a better refrigeration effect.

When the refrigeration device 400 includes the refrigeration fins 460, the inventors have found that when the refrigeration device 400 is working, frost may appear on the refrigeration fins 460, resulting in a decrease in refrigeration effect, an increase in power consumption, etc. In some embodiments, the steam oven also has an automatic defrosting function. Specifically, the temperature detection device 500 also includes a third temperature sensor 530, which is arranged on the refrigeration fins 460 to obtain a third temperature measurement value of the refrigeration fins 460. During the operation of the refrigeration device 400, the control device 600 monitors the relationship between the third temperature measurement value and the preset third refrigeration threshold value. When the third temperature measurement value is continuously lower than the third refrigeration threshold value for a period of time that reaches a preset second time threshold, the semiconductor refrigeration module 430 is controlled to stop refrigeration, for example, temporarily stopping the power supply to the semiconductor refrigeration module 430. When the third temperature measurement value is continuously lower than the third cooling threshold value for a period of time that reaches the preset second time threshold value, it means that the cooling fin 460 is lower than a certain temperature for a long time, and it is very likely that the cooling fin 460 will be frosted. At this time, the semiconductor refrigeration module 430 is controlled to stop cooling, but the fan 440 still keeps rotating, and the air in the cavity 110 is still sucked into the gas channel 450 from the air guide port 111. Under the action of the airflow, the frost on the cooling fin 460 is slowly removed. Another advantage of defrosting in the above manner is that it fully utilizes the thermal energy of the air in the cavity 110, has a high defrosting efficiency, and when the semiconductor refrigeration module 430 is not powered on, it still has a partial cooling effect on the cavity 110 for a short time. Since the air in the cavity 110 is originally to exchange heat energy in the gas channel 450 to achieve its own cooling, the thermal energy of this part of the air is relatively high, which is equivalent to using "hot air" to blow to the refrigeration fins 460. The natural defrosting efficiency is relatively high. During the defrosting process, the temperature of this part of the air also decreases to a certain extent. Therefore, even when the semiconductor refrigeration module 430 is not powered on, the cavity 110 can be cooled to a certain extent.

In the above embodiments, the cavity 110 is provided with a first temperature sensor 510 and a second temperature sensor 520. In other embodiments, more temperature sensors may be provided in the cavity 110. Similar to the above first temperature sensor 510 and the second temperature sensor 520, when more temperature sensors are provided in the cavity 110, each temperature sensor has a corresponding temperature sensitive range, and the measurement accuracy of each temperature sensor in the corresponding temperature sensitive range is higher than the measurement accuracy of other temperature sensors, and the temperature sensitive ranges corresponding to different temperature sensors do not intersect. Among them, the temperature sensitive range represents that the measurement accuracy of the temperature sensor is high within the temperature sensitive range. For example, among the three temperature sensors, one temperature sensor has the highest measurement accuracy at 0°C to 30°C, and its temperature sensitive range is 0°C to 30°C; another temperature sensor has the highest measurement accuracy at 40°C to 60°C, and its temperature sensitive range is 40°C to 60°C; another temperature sensor has the highest measurement accuracy at 70°C to 100°C, and its temperature sensitive range is 70°C to 100°C. It can be understood that the temperature measurement sensitive range can be different from the temperature measurement range of the temperature sensor. Still taking the above three temperature sensors as an example, the temperature measurement ranges of the three temperature sensors can be the same, for example, the temperature measurement ranges of the three temperature sensors are all 0°C to 260°C or 0°C to 100°C. Similarly, similar to the above embodiment, the measurement accuracy here can be reflected by the error between the temperature sensor and the standard temperature measuring instrument. When each temperature sensor is a resistive sensor, the curves of the resistance of each temperature sensor changing with temperature are also different.

In some embodiments, the cavity 110 includes at least two heating zones. When the heating device 300 is working, the heating rates of different heating zones are different. Each temperature sensor is located in a heating zone. The temperature measurement sensitive range corresponding to the temperature sensor in the heating zone with a fast heating rate is higher than the temperature measurement sensitive range corresponding to the temperature sensor in the heating zone with a slow heating rate, so that each temperature sensor obtains the corresponding temperature measurement value at an appropriate position in the cavity 110.

When more temperature sensors are arranged in the cavity 110, in some embodiments, the temperature measurement sensitive range into which the temperature measurement value of the target temperature sensor falls is determined as the target temperature measurement sensitive range, and then the temperature measurement value of the temperature sensor corresponding to the target measurement sensitive range is determined as the actual temperature. The target temperature sensor is a pre-selected temperature sensor. For example, there are three temperature sensors distributed up and down in the cavity 110, and the middle temperature sensor is pre-set as the target temperature sensor. When the temperature measurement value of the target temperature sensor falls into the temperature measurement sensitive range corresponding to the lowest temperature sensor, the temperature measurement value of the lowest temperature sensor is determined as the actual temperature, that is, the heating device 300 and/or the refrigeration device 400 is controlled according to the temperature measurement value of the lowest temperature sensor.

In some embodiments, the temperature measurement values of multiple temperature sensors are compared with each temperature measurement sensitive range. When the number of temperature measurement values falling into a certain temperature measurement sensitive range exceeds a preset number threshold, the temperature measurement value of the temperature sensor in the temperature measurement sensitive range is used as the actual temperature. For example, there are three temperature sensors distributed in the cavity 110 from top to bottom. When the temperature measurement values of all temperature sensors or more than half of the temperature measurement values fall into the measurement sensitive range of the middle temperature sensor, the temperature measurement value of the middle temperature sensor is determined as the actual temperature, that is, the heating device 300 and/or the refrigeration device 400 is controlled according to the temperature measurement value of the middle temperature sensor. In other embodiments, the temperature measurement values of multiple temperature sensors can also be compared with each temperature measurement sensitive range in the order of comparison of the temperature measurement sensitive range from low to high. In the comparison, when the number of temperature measurement values falling into a certain temperature measurement sensitive range exceeds a preset number threshold, the temperature measurement value of the temperature sensor in the temperature measurement sensitive range is used as the actual temperature, and the temperature measurement values of the multiple temperature sensors are no longer compared with other temperature measurement sensitive ranges. For example, there are five temperature sensors distributed in the cavity 110, and the quantity threshold is 2. The five temperature measurement values are first compared with the first temperature measurement sensitive range in order from low to high. When two or more temperature measurement values fall within the first temperature measurement sensitive range, the temperature measurement value of the temperature sensor corresponding to the first temperature measurement sensitive range is determined as the actual temperature. Otherwise, the five temperature measurement values continue to be compared with the second temperature measurement sensitive range.

In some embodiments, after comparing the temperature measurement values of multiple temperature sensors with each temperature measurement sensitive range, when no temperature measurement sensitive range satisfies that the number of temperature measurement values falling therein exceeds a preset number threshold, the actual temperature is obtained according to the temperature measurement values of at least two temperature sensors, for example, the actual temperature is calculated using the following formula:

Tr＝w1*T1+w2*T2+w3*T3…+wi*Ti；

Among them, Tr is the actual temperature, Ti is the temperature measurement value obtained by the i-th temperature sensor, and wi is the weight coefficient corresponding to the i-th temperature sensor.

Based on the steam oven in some examples of the present application, the embodiment shown in FIG5 provides a heating and cooling control method for the steam oven, including:

Step A100 , obtaining a first temperature measurement value in the cavity 110 through the first temperature sensor 510 .

Step A200 , obtaining a second temperature measurement value in the cavity 110 through the second temperature sensor 520 .

The first temperature sensor 510 and the second temperature sensor 520 themselves have the following differences: within the first temperature measurement sensitive range, the measurement accuracy of the first temperature sensor 510 is higher than that of the second temperature sensor 520, and within the second temperature measurement sensitive range different from the first temperature measurement sensitive range, the measurement accuracy of the second temperature sensor 520 is higher than that of the first temperature sensor 510. For example, the first temperature measurement sensitive range is 100°C to 200°C, and the second temperature measurement sensitive range is 30°C to 80°C. Within the first temperature measurement sensitive range, the first temperature measurement value obtained by the first temperature sensor 510 is more accurate, and within the second temperature measurement sensitive range, the second temperature measurement value obtained by the second temperature sensor 520 is more accurate. It should be noted that the temperature measurement sensitive range is different from the temperature measurement range of the temperature sensor, and the first temperature sensor 510 and the second temperature sensor 520 can have the same temperature measurement range.

In some embodiments, when the first temperature sensor 510 and the second temperature sensor 520 are both resistive sensors, the measurement accuracy in different temperature sensitivity ranges can be distinguished by the curve of resistance changing with temperature, that is, the first curve of resistance changing with temperature of the first temperature sensor 510 is different from the second curve of resistance changing with temperature of the second temperature sensor 520.

Step A300: Determine the actual temperature in the cavity 110 according to at least one of the first temperature measurement value and the second temperature measurement value.

In this step, the actual temperature is determined in order to determine which of the first temperature measurement value and the second temperature measurement value is subsequently used to control heating and/or cooling. In some embodiments, when it is determined which temperature measurement value is used for corresponding control, the step of determining the actual temperature is naturally completed.

For the convenience of explanation and understanding, the lowest temperature value of the first temperature measurement sensitive range referred to below is greater than the highest temperature value of the second temperature measurement sensitive range, that is, the two temperature measurement sensitive ranges have no intersection and the first temperature measurement sensitive range is higher. It can be understood that the first temperature measurement sensitive range and the second temperature measurement sensitive range may also have an intersection or at least partially overlap. In addition, in this article, when the highest temperature value in the second temperature measurement sensitive range is less than the highest temperature value in the first temperature measurement sensitive range, it is defined that the second temperature measurement sensitive range is lower than the first temperature measurement sensitive range.

In some embodiments, after obtaining the first temperature measurement value and the second temperature measurement value, the second temperature measurement value is compared with the second temperature measurement sensitive range. When the second temperature measurement value is within the second temperature measurement sensitive range, the second temperature measurement value is determined as the actual temperature. When the second temperature measurement value is not within the second temperature measurement sensitive range, the first temperature measurement value is compared with the first temperature measurement sensitive range. When the first temperature measurement value is within the first temperature measurement sensitive range, the first temperature measurement value is determined as the actual temperature. If the second temperature measurement value is not within the second temperature measurement sensitive range and the first temperature measurement value is also not within the first temperature measurement sensitive range, it is necessary to combine the first temperature measurement value and the second temperature measurement value to determine the actual temperature.

In some embodiments, the logic for determining the actual temperature is to first check whether the reading of the temperature sensor (second temperature sensor 520) corresponding to the low temperature is credible. When the second temperature measurement value is within the second temperature measurement sensitive range, it indicates that it is credible, and the reading of the temperature sensor is directly used. When the second temperature measurement value is not within the second temperature measurement sensitive range, it indicates that it is unreliable. Then check whether the reading of the temperature sensor (first temperature sensor 510) corresponding to the high temperature is credible. If it is credible, the reading of the temperature sensor is directly used. If it is unreliable, the readings of both temperature sensors are not directly used. In some embodiments, the method for determining the actual temperature by combining the first temperature measurement value and the second temperature measurement value can be: multiplying the first weight coefficient by the first temperature measurement value, multiplying the second weight coefficient by the second temperature measurement value, and then adding the two products to obtain the actual temperature, wherein the first weight coefficient and the second weight coefficient can be obtained based on experience. In addition, the above process of determining the actual temperature is confirmed from low temperature to high temperature. In other embodiments, it can also be confirmed from high temperature to low temperature, that is, first comparing the first temperature measurement value with the first temperature measurement sensitive range. When the first temperature measurement value is within the first temperature measurement sensitive range, the first temperature measurement sensitive range is directly used as the actual temperature.

In some embodiments, the steam oven has two temperature control modes, namely, a heating mode and a cooling mode, and the user can choose to enable the heating mode or the cooling mode. When the user chooses to enter the heating mode, the first temperature measurement value is determined as the actual temperature in the cavity 110, and when the user chooses to enter the cooling mode, the second temperature measurement value is determined as the actual temperature in the cavity 110. The steam oven can provide a clear mode selection button for the user to choose which mode to enter, and can also determine which mode the user has chosen to enter by the user choosing to start the heating device 300 or the cooling device 400.

In some embodiments, after the actual temperature is determined, the actual temperature can also be displayed, that is, the temperature measurement value used to control heating and/or cooling can be displayed, so that the user can understand which temperature measurement value is currently used for control. In some embodiments, the displayed temperature measurement value and the temperature measurement value used to control heating and/or cooling can also be different. For example, in the above heating mode, the first temperature measurement value is used to control heating, but when the first temperature measurement value and/or the second temperature measurement value are within the second temperature measurement sensitive range, it indicates that heating is currently being performed in a low temperature environment, so the second temperature measurement value is still displayed, which can make the displayed temperature measurement value more accurate.

Step A400: Control heating and/or cooling of the cavity 110 according to the actual temperature.

First, how to control the heating of the cavity 110 according to the actual temperature is described, and the steam oven is heated by the heating device 300 in the cavity 110 as an example. The structure of the heating device 300 can refer to the above description, and other structures of the heating device 300 can also be used.

In some embodiments, an open-loop control method can be used to control the heating of the cavity 110 according to the actual temperature. When the user sets the target temperature in the cavity 110, the actual temperature is compared with the target temperature, and the initial heating power and corresponding heating time of the heating device 300 are determined according to the comparison result, and then the heating device 300 is controlled to work at the initial heating power and heating time.

In some embodiments, a closed-loop control method can be used to control the heating of the cavity 110 according to the actual temperature. When the user sets the target temperature in the cavity 110, the actual temperature is compared with the target temperature, and then the initial heating power and corresponding heating time of the heating device 300 are determined according to the comparison result.

In some embodiments, the heating of the cavity 110 can also be controlled in stages according to the actual temperature. Specifically, it can include a first heating stage, a second heating stage, and a third heating stage, wherein the second heating stage can have one or more. The temperature difference between the target temperature and the actual temperature is monitored in all three stages.

When the user sets the target temperature in the cavity 110, the heating device 300 is first controlled to enter the first heating stage. In the first heating stage, the heating device 300 is controlled to work at the first heating power, and the relationship between the temperature difference and the first threshold is obtained. When the temperature difference is greater than the first threshold, the first heating stage continues, and if the temperature difference is not greater than the first threshold, the second heating stage is entered. In other words, when the temperature in the cavity 110 needs to be increased, the heating device 300 is first controlled to work at the first heating power until the difference between the actual temperature and the target temperature is reduced to a certain extent before entering the next stage. The first heating power can be a certain power that is pre-set. In a preferred embodiment, the first heating power is the rated maximum power of the heating device 300, that is, after the heating device 300 is started, the heating device 300 is first controlled to work at the rated maximum power to achieve rapid heating. The first heating power can also be determined based on the temperature difference, for example, the greater the temperature difference between the actual temperature and the target temperature, the greater the first heating power.

In some embodiments, the comparison between the temperature difference and the first threshold value in the first heating stage is periodic, that is, each time the heating device 300 is controlled to operate at the first heating power for a preset period of time, the temperature difference is compared with the first threshold value. If the temperature difference is greater than the first threshold value, the heating device 300 is controlled to operate at the first heating power for a preset period of time, until the temperature difference is less than or equal to the first threshold value, then the second heating stage is entered.

When there is only one second heating stage, the second heating power is less than the first heating power, and the second threshold is less than the first threshold. Similar to the first heating stage, in the second heating stage, the heating device 300 is controlled to work at the second heating power, and the relationship between the temperature difference and the second threshold is obtained. When the temperature difference is greater than the second threshold, the second heating stage is continued, and when the temperature difference is less than the second threshold, the third heating stage is entered. In other words, a second heating stage is equivalent to a weakened first heating stage. After the heating device 300 is started, it first works at a relatively large heating power, and then reduces the heating power. If the temperature difference meets the condition after the heating power is reduced, the third heating stage is entered.

When there are multiple second heating stages, the multiple second heating powers are all less than the first heating power, the multiple second thresholds are all less than the first threshold, and the second thresholds and second heating powers corresponding to different second heating stages are both decreasing. After entering a second heating stage, the heating device 300 works at the second heating power corresponding to the second heating stage. When the temperature difference is less than the second threshold corresponding to the second heating stage, it enters the second heating stage with smaller corresponding second heating power and second threshold, until the last second heating stage, if the temperature difference is less than the second threshold corresponding to the second heating stage, it enters the third heating stage. That is to say, in the process of the actual temperature rising, the heating power gradually decreases in stages, and the closer to the target temperature, the smaller the heating power.

The following describes how to control the refrigeration in the cavity 110 according to the actual temperature, and takes the refrigeration of the steam oven through the refrigeration device 400 as an example. The structure of the refrigeration device 400 can refer to the above description, and other structures of the refrigeration device 400 can also be used.

In some embodiments, when it is detected that the user has set a cooling setting in the cavity 110, it is determined whether to start the cooling device 400 according to the actual temperature. When it is detected that the user has set a cooling setting in the cavity 110, the actual temperature is compared with the preset first cooling temperature threshold. When the actual temperature is higher than the first cooling temperature threshold, the cooling device 400 is started, otherwise, the cooling device 400 is stopped. In other words, cooling is performed only when the actual temperature meets certain conditions. For example, the first cooling temperature threshold is 40°C. When it is higher than 40°C, the cooling device 400 is not started to prevent the air with too high temperature in the cavity 110 from entering the gas channel 450 and damaging the cooling device 400.

In some embodiments, during the refrigeration process, it is determined whether to stop the operation of the refrigeration device 400 according to the actual temperature. Specifically, during the operation of the refrigeration device 400, the actual temperature is compared with the preset second refrigeration temperature threshold. When the actual temperature is lower than the second refrigeration temperature threshold, the operation of the refrigeration device 400 is stopped, otherwise the operation of the refrigeration device 400 is not stopped. For example, the second refrigeration temperature threshold is 0°C, that is, when the actual temperature in the cavity 110 drops below zero, the refrigeration is temporarily stopped. After the operation of the refrigeration device 400 is stopped, when the actual temperature is higher than the second refrigeration temperature threshold, the operation of the refrigeration device 400 is started again. In the above manner, the temperature in the cavity 110 can be prevented from being too low.

Based on the steam oven in some examples of the present application, the embodiment shown in FIG6 provides a heating and cooling control method for the steam oven, including:

Step B100: obtaining a temperature measurement value in the cavity 110 through each of at least two temperature sensors.

Similar to the above-mentioned first temperature sensor 510 and second temperature sensor 520, when more temperature sensors are arranged in the cavity 110, each temperature sensor has a corresponding temperature measurement sensitive range, and the measurement accuracy of each temperature sensor in the corresponding temperature measurement sensitive range is higher than the measurement accuracy of other temperature sensors, and the temperature measurement sensitive ranges corresponding to different temperature sensors do not intersect. Among them, the temperature measurement sensitive range represents that the measurement accuracy of the temperature sensor is high within the temperature measurement sensitive range. For example, among the three temperature sensors, one temperature sensor has the highest measurement accuracy at 0°C to 30°C, and its temperature measurement sensitive range is 0°C to 30°C; another temperature sensor has the highest measurement accuracy at 40°C to 60°C, and its temperature measurement sensitive range is 40°C to 60°C; and another temperature sensor has the highest measurement accuracy at 70°C to 100°C, and its temperature measurement sensitive range is 70°C to 100°C. It can be understood that the temperature measurement sensitive range can be different from the temperature measurement range of the temperature sensor. Still taking the above three temperature sensors as an example, the temperature measurement ranges of the three temperature sensors can be the same, for example, the temperature measurement ranges of the three temperature sensors are all 0°C to 260°C or 0°C to 100°C. Similarly, similar to the above embodiment, the measurement accuracy here can be reflected by the error between the temperature sensor and the standard temperature measuring instrument. When each temperature sensor is a resistive sensor, the curves of the resistance of each temperature sensor changing with temperature are also different.

Step B200: determining the actual temperature in the cavity 110 according to the temperature measurement value of at least one temperature sensor.

In some embodiments, the temperature measurement sensitive range within which the temperature measurement value of the target temperature sensor falls is determined as the target temperature measurement sensitive range, and then the temperature measurement value of the temperature sensor corresponding to the target measurement sensitive range is determined as the actual temperature. The target temperature sensor is a pre-selected temperature sensor. For example, there are three temperature sensors distributed up and down in the cavity 110, and the middle temperature sensor is pre-set as the target temperature sensor. When the temperature measurement value of the target temperature sensor falls within the temperature measurement sensitive range corresponding to the bottom temperature sensor, the temperature measurement value of the bottom temperature sensor is determined as the actual temperature, that is, the heating device 300 and/or the refrigeration device 400 is controlled according to the temperature measurement value of the bottom temperature sensor.

Tr＝w1*T1+w2*T2+w3*T3…+wi*Ti；

Step B300: Control heating and/or cooling of the cavity 110 according to the actual temperature.

Step B300 is similar to the above-mentioned step A400 and will not be described in detail here.

The steam oven and the heating and cooling control method thereof of the above-mentioned embodiment can obtain a more accurate actual temperature in the cavity, and can adopt a variety of heating schemes to meet cooking needs. During cooling, the refrigeration device can also be automatically defrosted, thereby improving the reliability of the steam oven.

This document is described with reference to various exemplary embodiments. However, those skilled in the art will recognize that changes and modifications may be made to the exemplary embodiments without departing from the scope of this document. For example, various operating steps and components for performing the operating steps may be implemented in different ways (e.g., one or more steps may be deleted, modified, or incorporated into other steps) depending on the specific application or considering any number of cost functions associated with the operation of the system.

In addition, as will be appreciated by those skilled in the art, the principles of the present invention may be reflected in a computer program product on a computer-readable storage medium preloaded with computer-readable program code. Any tangible, non-transitory computer-readable storage medium may be used, including magnetic storage devices (hard disks, floppy disks, etc.), optical storage devices (CD-ROMs, DVDs, Blu-Ray disks, etc.), flash memory, and/or the like. These computer program instructions may be loaded onto a general-purpose computer, a special-purpose computer, or other programmable data processing device to form a machine, such that the instructions executed on the computer or other programmable data processing device may generate a device that implements a specified function. These computer program instructions may also be stored in a computer-readable memory, which may instruct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable memory may form an article of manufacture, including an implementation device that implements a specified function. The computer program instructions may also be loaded onto a computer or other programmable data processing device, thereby executing a series of operating steps on the computer or other programmable device to produce a computer-implemented process, such that the instructions executed on the computer or other programmable device may provide steps for implementing a specified function.

Although the principles of this invention have been shown in various embodiments, many modifications of structures, arrangements, proportions, elements, materials and components particularly suitable for specific environments and operational requirements can be used without departing from the principles and scope of this disclosure. The above modifications and other changes or amendments will be included in the scope of this invention.

The foregoing specific description has been described with reference to various embodiments. However, those skilled in the art will recognize that various modifications and changes can be made without departing from the scope of the present disclosure. Therefore, the consideration of the present disclosure will be in an illustrative rather than a restrictive sense, and all these modifications will be included in its scope. Similarly, the advantages, other advantages and solutions to the problems of various embodiments have been described above. However, the benefits, advantages, solutions to the problems and any elements that can produce these, or solutions that make them more clear should not be interpreted as critical, necessary or necessary. The term "include" and any other variants used in this article are all non-exclusive inclusions, so that the process, method, article or device including the list of elements includes not only these elements, but also includes other elements that are not explicitly listed or do not belong to the process, method, system, article or device. In addition, the term "coupled" and any other variants used in this article refer to physical connections, electrical connections, magnetic connections, optical connections, communication connections, functional connections and/or any other connections.

Those skilled in the art will appreciate that many changes may be made to the details of the above-described embodiments without departing from the basic principles of the invention. Accordingly, the scope of the invention should be determined from the following claims.

Claims

A steam oven, characterized by comprising:

A box body having a cavity for containing food and an opening connecting the outside with the cavity;

A door, which is used to open and close the opening;

A heating device, the heating device is used to increase the temperature in the cavity;

A refrigeration device, the refrigeration device is used to reduce the temperature in the cavity;

A temperature detection device, the temperature detection device comprising a first temperature sensor and a second temperature sensor, the first temperature sensor being used to obtain a first temperature measurement value in the cavity, the second temperature sensor being used to obtain a second temperature measurement value in the cavity, the measurement accuracy of the first temperature sensor being higher than the measurement accuracy of the second temperature sensor within a first temperature measurement sensitive range, and the measurement accuracy of the second temperature sensor being higher than the measurement accuracy of the first temperature sensor within a second temperature measurement sensitive range different from the first temperature measurement sensitive range;

A control device is used to determine the actual temperature in the cavity according to at least one of the first temperature measurement value and the second temperature measurement value, and control the heating device and/or the refrigeration device according to the actual temperature.
The steam oven according to claim 1, characterized in that the determining the actual temperature in the cavity according to at least one of the first temperature measurement value and the second temperature measurement value comprises at least one of the following:

When the first temperature measurement value and/or the second temperature measurement value is within the second temperature measurement sensitive range, determining the second temperature measurement value as the actual temperature;

When the first temperature measurement value and/or the second temperature measurement value is within the first temperature measurement sensitive range, determining the first temperature measurement value as the actual temperature;

When the first temperature measurement value and/or the second temperature measurement value is outside the first temperature measurement sensitive range and the second temperature measurement sensitive range, the actual temperature is obtained according to the first temperature measurement value and the second temperature measurement value.
The steam oven according to claim 2, characterized in that the actual temperature is obtained according to the first temperature measurement value and the second temperature measurement value, comprising:

The actual temperature is obtained according to the first temperature measurement value and the second temperature measurement value based on a preset first weight coefficient corresponding to the first temperature sensor and a preset second weight coefficient corresponding to the second temperature sensor.
A steam oven, characterized by comprising:

A box body having a cavity for containing food and an opening connecting the outside with the cavity;

A door, which is used to open and close the opening;

A heating device, the heating device is used to increase the temperature in the cavity;

A refrigeration device, the refrigeration device is used to reduce the temperature in the cavity;

a temperature detection device, the temperature detection device comprising a first temperature sensor and a second temperature sensor, the first temperature sensor being used to obtain a first temperature measurement value in the cavity, the second temperature sensor being used to obtain a second temperature measurement value in the cavity, a first curve of resistance variation with temperature of the first temperature sensor being different from a second curve of resistance variation with temperature of the second temperature sensor;

A control device is used to determine the actual temperature in the cavity according to at least one of the first temperature measurement value and the second temperature measurement value, and control the heating device and/or the refrigeration device according to the actual temperature.
A steam oven, characterized by comprising:

A box body having a cavity for containing food and an opening connecting the outside with the cavity;

A door, which is used to open and close the opening;

A heating device, the heating device is used to increase the temperature in the cavity;

A refrigeration device, the refrigeration device is used to reduce the temperature in the cavity;

a temperature detection device, the temperature detection device comprising a first temperature sensor and a second temperature sensor, the first temperature sensor being used to obtain a first temperature measurement value in the cavity, and the second temperature sensor being used to obtain a second temperature measurement value in the cavity;

a control device, configured to obtain a temperature control mode set for the cavity, the temperature control mode comprising a heating mode and a cooling mode, and when the temperature control mode is the heating mode, determining the first temperature measurement value as the actual temperature in the cavity, and when the temperature control mode is the cooling mode, determining the second temperature measurement value as the actual temperature in the cavity;

The heating device is controlled and/or the cooling device is controlled according to the actual temperature.
The steam oven according to claim 5, characterized in that a first curve of the resistance of the first temperature sensor varying with temperature is different from a second curve of the resistance of the second temperature sensor varying with temperature.
The steam oven according to claim 5 is characterized in that within a first temperature measurement sensitive range, the measurement accuracy of the first temperature sensor is higher than the measurement accuracy of the second temperature sensor, and within a second temperature measurement sensitive range lower than the first temperature measurement sensitive range, the measurement accuracy of the second temperature sensor is higher than the measurement accuracy of the first temperature sensor, and when the temperature control mode is a heating mode, the control device is further used to display the second temperature measurement value when the first temperature measurement value and/or the second temperature measurement value are within the second temperature measurement sensitive range.
The steam oven according to claim 1, 4 or 5 is characterized in that the cavity includes a first temperature rise zone and a second temperature rise zone, when the heating device is working, the temperature rise rate of the first temperature rise zone is faster than the temperature rise rate of the second temperature rise zone, the first temperature sensor is located in the first temperature rise zone, and the second temperature sensor is located in the second temperature rise zone.
The steam oven according to claim 8, characterized in that the heating device comprises a plurality of heating tubes, the plurality of heating tubes are distributed on the top wall and the side walls of the cavity, and the first temperature sensor and the second temperature sensor are distributed up and down in the cavity.
In the steam oven as described in claim 1, 4 or 5, the first temperature sensor and the second temperature sensor are distributed vertically in the cavity.
A steam oven, characterized by comprising:

A box body having a cavity for containing food and an opening connecting the outside with the cavity;

A door, which is used to open and close the opening;

A heating device, the heating device is used to increase the temperature in the cavity;

A refrigeration device, the refrigeration device is used to reduce the temperature in the cavity;

A temperature detection device, wherein the temperature detection device comprises at least two temperature sensors, each of which is used to obtain a temperature measurement value in the cavity, each of which has a corresponding temperature measurement sensitive range, and the measurement accuracy of each temperature sensor within the corresponding temperature measurement sensitive range is higher than the measurement accuracy of other temperature sensors, and the temperature measurement sensitive ranges corresponding to different temperature sensors do not intersect;

A control device is used to determine the actual temperature in the cavity according to the temperature measurement value of the at least one temperature sensor, and control the heating device and/or the refrigeration device according to the actual temperature.
The steam oven according to claim 11, characterized in that the determining the actual temperature in the cavity according to the temperature measurement value of the at least one temperature sensor comprises:

The control device compares the temperature measurement value of each of the temperature sensors with each of the temperature measurement sensitive ranges, so as to determine whether there is a target temperature measurement sensitive range in the at least two temperature ranges, wherein the number of temperature sensors whose temperature measurement values fall into the target temperature measurement sensitive range exceeds a preset number threshold;

When there is a target temperature measurement sensitive range, the temperature measurement value of the temperature sensor corresponding to the target temperature measurement sensitive range is determined as the actual temperature; when there is no target temperature measurement sensitive range, the actual temperature is obtained according to the temperature measurement values of the at least two temperature sensors.
The steam oven according to claim 12, characterized in that the actual temperature is obtained according to the temperature measurement values of the at least two temperature sensors, comprising:

The actual temperature is obtained according to the temperature measurement values of the at least two temperature sensors based on a preset weight coefficient corresponding to each temperature sensor.
The steam oven according to claim 12, characterized in that the control device compares the temperature measurement value of each of the temperature sensors with each of the temperature measurement sensitive ranges, thereby determining whether there is a target temperature measurement sensitive range in the at least two temperature ranges, comprising:

The control device compares the temperature measurement value of each temperature sensor with each temperature measurement sensitive range according to a predetermined comparison order of the temperature measurement sensitive range; when the number of temperature sensors whose temperature measurement values fall within the temperature measurement sensitive range exceeds a preset number threshold, it is determined that the target temperature measurement sensitive range exists and the comparison is stopped; otherwise, the comparison is continued according to the comparison order until all the temperature measurement sensitive ranges have completed the comparison, and it is determined that the target temperature measurement sensitive range does not exist.
The steam oven according to claim 11, characterized in that the determining the actual temperature in the cavity according to the temperature measurement value of the at least one temperature sensor comprises:

The control device determines the temperature measurement sensitive range within which the temperature measurement value of the target temperature sensor falls as the target temperature measurement sensitive range, wherein the target temperature sensor is a temperature sensor selected from the at least two temperature sensors;

A temperature measurement value of a temperature sensor corresponding to the target measurement sensitive range is determined as the actual temperature.
The steam oven according to claim 11 is characterized in that the cavity includes at least two temperature rising areas, when the heating device is working, the temperature rising speeds of different temperature rising areas are different, and each of the temperature sensors is located in one of the temperature rising areas.
The steam oven according to claim 1, 4, 5 or 11, characterized in that the controlling the heating device according to the actual temperature comprises:

After detecting that the user sets the target temperature in the cavity, monitoring the temperature difference between the target temperature and the actual temperature;

Control the heating device to enter a first heating stage, control the heating device to work at a first heating power in the first heating stage, obtain the relationship between the temperature difference and a first threshold value, and when the temperature difference is greater than the first threshold value, continue the first heating stage; otherwise

The heating device is controlled to enter at least one second heating stage in sequence, each of the second heating stages has a corresponding second threshold and a second heating power, the heating device is controlled to operate at the corresponding second heating power in each of the second heating stages, the relationship between the temperature difference and the corresponding second threshold is obtained, when the temperature difference is greater than the corresponding second threshold, the current second heating stage is continued, otherwise, the next second heating stage is entered, or the heating device is controlled to enter the third heating stage in the last second heating stage; wherein, when there is one second heating stage, the second threshold is less than the first threshold; when there are at least two second heating stages, the second thresholds and second heating powers corresponding to different second heating stages are both decreased, each of the second heating powers is less than the first heating power, and each of the second thresholds is less than the first threshold;

In the third heating stage, the temperature difference is used as input, and a PID algorithm is used to control the third heating power of the heating device when it is working, so that the actual temperature reaches the target temperature.
The steam oven according to claim 17, characterized in that the step of controlling the heating device to operate at a first heating power, obtaining a relationship between the temperature difference and a first threshold, and continuing the first heating stage when the temperature difference is greater than the first threshold, comprises:

After controlling the heating device to work at the first heating power for a preset time, the relationship between the temperature difference and the first threshold is obtained, and when the temperature difference is greater than the first threshold, the heating device continues to be controlled to work at the first heating power for a preset time.
The steam oven according to claim 17, characterized in that the second heating stage includes one, and the control device is further used for:

The timing starts when the heating device is controlled to enter the second heating stage. When the timing duration reaches a preset first time threshold and the heating device has not entered the third heating stage, the heating device is controlled to enter the third heating stage.
The steam oven according to claim 1, 4, 5 or 11, characterized in that the control device controls the refrigeration device according to the actual temperature, comprising at least one of the following steps:

When the user sets a cooling setting in the cavity, determining whether to start the cooling device according to the actual temperature;

During the operation of the refrigeration device, determining whether to stop the operation of the refrigeration device according to the actual temperature;

During the operation of the refrigeration device, the refrigeration power of the refrigeration device is determined according to the actual temperature.
The steam oven according to claim 20, characterized in that when the user sets a refrigeration setting in the cavity, determining whether to start the refrigeration device according to the actual temperature comprises:

When it is detected that the user sets a cooling setting in the cavity, the actual temperature is compared with a preset first cooling temperature threshold, and when the actual temperature is higher than the first cooling temperature threshold, the cooling device is started, otherwise, the cooling device is stopped;

During the operation of the refrigeration device, determining whether to stop the operation of the refrigeration device according to the actual temperature includes:

During the operation of the refrigeration device, the actual temperature is compared with a preset second refrigeration temperature threshold. When the actual temperature is lower than the second refrigeration temperature threshold, the operation of the refrigeration device is terminated. Otherwise, the operation of the refrigeration device is not terminated. After the operation of the refrigeration device is terminated, when the actual temperature is higher than the second refrigeration temperature threshold, the refrigeration device is started again.
The steam oven according to claim 21, wherein the refrigeration device comprises:

A gas channel, the gas channel having at least two air guide ports connected to the cavity;

At least two valves, the at least two valves corresponding to the at least two air guide ports respectively, the valves being capable of closing and opening the corresponding air guide ports to connect or isolate the gas channel and the cavity;

A semiconductor refrigeration module, wherein the semiconductor refrigeration module has a hot end and a cold end, and the cold end of the semiconductor refrigeration module is used to cool the gas channel;

a fan, disposed in the gas passage, wherein when the fan rotates, the fan inhales gas from the cavity through at least one of the air guide ports, and delivers gas into the cavity through at least another of the air guide ports;

The step of the control device starting the refrigeration device to work includes:

Control the valve to open the corresponding air guide port;

Controlling the semiconductor refrigeration module to start refrigeration;

Control the fan to rotate.
The steam oven according to claim 22, characterized in that the refrigeration device further comprises: a refrigeration fin, which is arranged in the gas channel, and the refrigeration fin is thermally connected to the cold end of the semiconductor refrigeration module; the temperature detection device comprises a third temperature sensor, and the third temperature sensor is arranged on the refrigeration fin to obtain a third temperature measurement value of the refrigeration fin. After the refrigeration device is started according to the actual temperature control, the control device is also used to:

Monitor the relationship between the third temperature measurement value and a preset third refrigeration threshold value. When the time duration during which the third temperature measurement value is continuously lower than the third refrigeration threshold value reaches a preset second time threshold value, control the semiconductor refrigeration module to stop refrigeration until the third temperature measurement value is greater than the third refrigeration threshold value, and control the semiconductor refrigeration module to start refrigeration again.
The steam oven according to claim 1, 4, 5 or 11, characterized in that the control device is also used to determine whether to issue an overtemperature alarm and/or whether to allow the user to open the oven door based on the actual temperature.
A heating and cooling control method for a steam oven, characterized by comprising:

Acquiring a first temperature measurement value in a cavity of a steam oven through a first temperature sensor, wherein the cavity is used to contain food;

obtaining a second temperature measurement value in the cavity through a second temperature sensor, wherein within a first temperature measurement sensitive range, a measurement accuracy of the first temperature sensor is higher than a measurement accuracy of the second temperature sensor, and within a second temperature measurement sensitive range different from the first temperature measurement sensitive range, a measurement accuracy of the second temperature sensor is higher than a measurement accuracy of the first temperature sensor;

An actual temperature in the cavity is determined based on at least one of the first temperature measurement value and the second temperature measurement value, and heating and/or cooling of the cavity is controlled based on the actual temperature.
The method of claim 25, wherein determining the actual temperature in the cavity based on at least one of the first temperature measurement value and the second temperature measurement value comprises at least one of the following:

When the first temperature measurement value and/or the second temperature measurement value is within the second temperature measurement sensitive range, determining the second temperature measurement value as the actual temperature;

When the first temperature measurement value and/or the second temperature measurement value is within the first temperature measurement sensitive range, determining the first temperature measurement value as the actual temperature;

When the first temperature measurement value and/or the second temperature measurement value is outside the first temperature measurement sensitive range and the second temperature measurement sensitive range, the actual temperature is obtained according to the first temperature measurement value and the second temperature measurement value.
A heating and cooling control method for a steam oven, characterized by comprising:

Acquiring a first temperature measurement value in a cavity of a steam oven through a first temperature sensor, wherein the cavity is used to contain food;

obtaining a second temperature measurement value in the cavity by a second temperature sensor, wherein a first curve of resistance variation with temperature of the first temperature sensor is different from a second curve of resistance variation with temperature of the second temperature sensor;

An actual temperature in the cavity is determined based on at least one of the first temperature measurement value and the second temperature measurement value, and heating and/or cooling of the cavity is controlled based on the actual temperature.
A heating and cooling control method for a steam oven, characterized by comprising:

Acquiring a first temperature measurement value in a cavity of a steam oven through a first temperature sensor, wherein the cavity is used to contain food;

obtaining a second temperature measurement value in the cavity by a second temperature sensor;

acquiring a temperature control mode set for the cavity, the temperature control mode including a heating mode and a cooling mode, and when the temperature control mode is the heating mode, determining the first temperature measurement value as the actual temperature in the cavity, and when the temperature control mode is the cooling mode, determining the second temperature measurement value as the actual temperature in the cavity;

The heating and/or cooling of the cavity is controlled according to the actual temperature.
The method of claim 28, wherein a first curve of resistance variation with temperature of the first temperature sensor is different from a second curve of resistance variation with temperature of the second temperature sensor.
A heating and cooling control method for a steam oven, characterized by comprising:

The temperature measurement value in the inner cavity of the steam oven is obtained by each of the at least two temperature sensors, each of the temperature sensors has a corresponding temperature measurement sensitive range, the measurement accuracy of each temperature sensor in the corresponding temperature measurement sensitive range is higher than the measurement accuracy of other temperature sensors, and the temperature measurement sensitive ranges corresponding to different temperature sensors do not intersect;

The actual temperature in the cavity is determined according to the temperature measurement value of the at least one temperature sensor, and the heating and/or cooling of the cavity is controlled according to the actual temperature.
The method of claim 25, 27, 28 or 30, wherein controlling the heating of the cavity according to the actual temperature comprises:

After detecting that the user sets the target temperature in the cavity, monitoring the temperature difference between the target temperature and the actual temperature;

Controlling a heating device for increasing the temperature in the steam oven to enter a first heating stage, controlling the heating device to operate at a first heating power in the first heating stage, obtaining a relationship between the temperature difference and a first threshold, and continuing the first heating stage when the temperature difference is greater than the first threshold; otherwise

The heating device is controlled to enter at least one second heating stage in sequence, each of the second heating stages has a corresponding second threshold value and a second heating power, the heating device is controlled to operate at the corresponding second heating power in each of the second heating stages, the relationship between the temperature difference and the corresponding second threshold value is obtained, when the temperature difference is greater than the corresponding second threshold value, the current second heating stage is continued, otherwise, the next second heating stage is entered, or the heating device is controlled to enter the third heating stage in the last second heating stage; wherein, when there is one second heating stage, the second threshold value is less than the first threshold value; when there are at least two second heating stages, the second threshold values and the second heating powers corresponding to different second heating stages are both decreased, each of the second heating powers is less than the first heating power, and each of the second threshold values is less than the first threshold value;

In the third heating stage, the temperature difference is used as input, and a PID algorithm is used to control the third heating power of the heating device when it is working, so that the actual temperature reaches the target temperature.
The method of claim 31, wherein the second heating stage comprises one, the method further comprising:

The timing starts when the heating device is controlled to enter the second heating stage. When the timing duration reaches a preset first time threshold and the heating device has not entered the third heating stage, the heating device is controlled to enter the third heating stage.
The method of claim 25, 27, 28 or 30, wherein controlling the cooling of the cavity according to the actual temperature comprises at least one of the following steps:

When detecting that the user sets a cooling setting in the cavity, determining whether to start cooling according to the actual temperature;

During the process of cooling the cavity, determining whether to terminate cooling according to the actual temperature;

In the process of cooling the cavity, the cooling power of the cooling device in the steam oven for reducing the temperature is determined according to the actual temperature.
A computer-readable storage medium, characterized in that a program is stored on the medium, and the program can be executed by a processor to implement the method as described in any one of claims 25 to 33.