WO2024082237A1 - Method for controlling humidity in steam oven and steam oven - Google Patents

Abstract

Disclosed are a method for controlling the humidity in a steam oven, and a steam oven. The method comprises: acquiring a target temperature set by a user for a cavity of a steam oven (S100), the cavity being used for accommodating food; acquiring a target relative humidity set by the user for the cavity, and adjusting the humidity of air in the cavity, so that the relative humidity in the cavity reaches a reference relative humidity (S200); controlling, according to the relationship between the target relative humidity and the reference relative humidity, whether to introduce water vapor into the cavity (S300); acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change amount caused by whether water vapor is introduced into the cavity after the relative humidity in the cavity reaches the reference relative humidity (S400); and comparing the humidity measurement value change amount with a change amount threshold, and controlling introduction of water vapor into the cavity according to the comparison result (S500), wherein the change amount threshold is determined on the basis of the target temperature and the target relative humidity, and the humidity can be adjusted more accurately.

Description

A humidity control method for a steam oven and a steam oven Technical Field

The invention relates to the technical field of cooking, and in particular to a humidity control method for a steam oven and a steam oven.

Background technique

As people's quality of life improves, 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 requirements for the humidity in the steam ovens. Therefore, how to obtain the humidity in the steam ovens more accurately is one of the problems to be solved or improved.

To solve this problem, some cooking appliances such as steam ovens use absolute humidity sensors to measure humidity. A typical partial structure of an absolute humidity sensor is shown in Figure 1, which includes resistors R1, R2 and a comparator. The resistance of resistor R1 is theoretically the same as the resistance of resistor R2. Resistor R1 is exposed to the air, and resistor R2 is placed in a shell filled with inert gas. When the humidity in the air changes, the resistance of resistor R1 will change, while the resistance of resistor R2 will remain stable. The humidity measurement value in the air can be obtained through the resistance difference between resistors R1 and R2.

Although the use of absolute humidity sensors can improve the accuracy of humidity measurement to a certain extent, the absolute humidity sensor itself has at least the following errors: the first is the manufacturing error. The resistance values of resistors R1 and R2 may not be exactly the same, which affects the measurement accuracy of the absolute humidity sensor. Due to the existence of this error, the readings of different absolute humidity sensors may be different under the same humidity environment. The second is the measurement error. When there is airflow in the air or due to the influence of evaporation, the resistance value of resistor R1 may change differently under the same humidity environment, which may also cause the readings of different absolute humidity sensors to be different under the same humidity environment, or the same absolute humidity sensor may have different readings of humidity measured multiple times under the same humidity environment. In any of the above situations, it is not conducive to obtaining accurate humidity, thus affecting the expected cooking effect.

Summary of the invention

The main technical problem solved by the present invention is to provide a steam oven and a humidity control method for the steam oven, and the steam oven can measure humidity more accurately.

In order to solve the above technical problems, an embodiment of the present application provides a humidity control method for a steam oven, comprising:

a target temperature acquisition step, acquiring a target temperature set by a user for a cavity of the steam oven, the cavity being used to contain food;

a target relative humidity acquisition step, acquiring the target relative humidity set by the user for the cavity;

a first humidity control step of introducing water vapor into the cavity so that after the relative humidity in the cavity reaches 100%, no water vapor is introduced into the cavity;

A humidity change acquisition step, acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change caused by not introducing water vapor into the cavity after the relative humidity in the cavity reaches 100%;

The second humidity control step is to compare the change in the humidity measurement value with a change threshold, and control the introduction of water vapor into the cavity according to the comparison result, wherein the change threshold is determined based on the target temperature and the target relative humidity.

In order to solve the above technical problems, an embodiment of the present application provides a humidity control method for a steam oven, comprising:

a target temperature acquisition step, acquiring a target temperature set by a user for a cavity of the steam oven, the cavity being used to contain food;

a target relative humidity acquisition step, acquiring the target relative humidity set by the user for the cavity;

a first humidity control step of drying the air in the cavity so that the relative humidity in the cavity reaches approximately zero percent, and then introducing water vapor into the cavity;

a humidity change acquisition step, acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change caused by introducing water vapor into the cavity after the relative humidity in the cavity reaches approximately zero percent;

The second humidity control step is to compare the change in the humidity measurement value with a change threshold, and control the introduction of water vapor into the cavity according to the comparison result, wherein the change threshold is determined based on the target temperature and the target relative humidity.

In order to solve the above technical problems, an embodiment of the present application provides a humidity control method for a steam oven, comprising:

a target temperature acquisition step, acquiring a target temperature set by a user for a cavity of the steam oven, the cavity being used to contain food;

a target relative humidity acquisition step, acquiring the target relative humidity set by the user for the cavity;

a first humidity control step of adjusting the humidity of the air in the cavity so that the relative humidity in the cavity reaches a reference relative humidity, and then controlling whether to introduce water vapor into the cavity according to the relationship between the target relative humidity and the reference relative humidity;

A humidity change acquisition step, acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change amount caused by whether water vapor is introduced into the cavity after the relative humidity in the cavity reaches a reference relative humidity;

The second humidity control step is to compare the change in the humidity measurement value with a change threshold, and control the introduction of water vapor into the cavity according to the comparison result, wherein the change threshold is determined based on the target temperature and the target relative humidity.

In order to solve the above technical problems, an embodiment of the present application 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 steam generating device for generating water vapor for passing into the cavity;

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

A temperature detection device, the temperature detection device is used to obtain a temperature measurement value in the cavity;

an absolute humidity sensor, the absolute humidity sensor being located in the cavity and being used to obtain a humidity measurement value in the cavity;

A control device for performing the following steps:

a target temperature acquisition step, acquiring a target temperature set by a user for the cavity;

a target relative humidity acquisition step, acquiring the target relative humidity set by the user for the cavity;

a first humidity control step, controlling the steam generating device to pass water vapor into the cavity, so that after the relative humidity in the cavity reaches 100%, the steam generating device is controlled not to pass water vapor into the cavity;

a humidity change acquisition step, acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change amount caused by controlling the steam generating device not to introduce water vapor into the cavity after the relative humidity in the cavity reaches 100%;

The second humidity control step is to compare the change in the humidity measurement value with a change threshold, and control the introduction of water vapor into the cavity according to the comparison result, wherein the change threshold is determined based on the target temperature and the target relative humidity.

In order to solve the above technical problems, an embodiment of the present application 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 steam generating device for generating water vapor for passing into the cavity;

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

A temperature detection device, the temperature detection device is used to obtain a temperature measurement value in the cavity;

an absolute humidity sensor, the absolute humidity sensor being located in the cavity and being used to obtain a humidity measurement value in the cavity;

A control device for performing the following steps:

a target temperature acquisition step, acquiring a target temperature set by a user for the cavity;

a target relative humidity acquisition step, acquiring the target relative humidity set by the user for the cavity;

a first humidity control step of drying the air in the cavity so that the relative humidity in the cavity reaches approximately zero percent, and then controlling the steam generating device to pass water vapor into the cavity;

a humidity change acquisition step, acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change amount caused by controlling the steam generating device to pass water vapor into the cavity after the relative humidity in the cavity reaches approximately zero percent;

The second humidity control step is to compare the change in the humidity measurement value with a change threshold, and control the introduction of water vapor into the cavity according to the comparison result, wherein the change threshold is determined based on the target temperature and the target relative humidity.

In order to solve the above technical problems, an embodiment of the present application 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 steam generating device for generating water vapor for passing into the cavity;

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

A temperature detection device, the temperature detection device is used to obtain a temperature measurement value in the cavity;

an absolute humidity sensor, the absolute humidity sensor being located in the cavity and being used to obtain a humidity measurement value in the cavity;

A control device for performing the following steps:

a target temperature acquisition step, acquiring a target temperature set by a user for the cavity;

a target relative humidity acquisition step, acquiring the target relative humidity set by the user for the cavity;

a first humidity control step of adjusting the humidity of the air in the cavity so that the relative humidity in the cavity reaches a reference relative humidity, and then controlling whether the steam generating device introduces water vapor into the cavity according to the relationship between the target relative humidity and the reference relative humidity;

a humidity change acquisition step, acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change amount caused by controlling whether the steam generating device passes water vapor into the cavity after the relative humidity in the cavity reaches a reference relative humidity;

The second humidity control step is to compare the change in the humidity measurement value with a change threshold, and control the introduction of water vapor into the cavity according to the comparison result, wherein the change threshold is determined based on the target temperature and the target relative humidity.

In order to solve the above technical problem, an embodiment of the present application 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 humidity control method of the steam oven in the above embodiment, a reference relative humidity is set in advance, and then whether the cavity of the steam oven has reached the set target relative humidity is determined based on the change in humidity measurement value obtained by the absolute humidity sensor from the reference relative humidity. If the same absolute humidity sensor has experienced the same change in humidity measurement value at the reference relative humidity, it means that the current environment has reached the same relative humidity, which has nothing to do with the reading of the absolute humidity sensor at the reference relative humidity. Therefore, the error of the absolute humidity sensor itself can be eliminated, and the humidity measurement accuracy of the absolute humidity sensor can be improved to obtain the expected cooking effect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of an absolute humidity sensor according to an embodiment;

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

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

FIG4 is a schematic structural diagram of a steam oven according to an embodiment;

FIG5 is an enlarged schematic diagram of point A in FIG4 ;

FIG6 is a schematic structural diagram of a steam oven with a portion of the rear side wall hidden in an embodiment;

FIG. 7 is a schematic diagram of the front structure of a steam oven according to an embodiment;

FIG8 is a flow chart of a humidity control method for a steam oven according to an embodiment;

100, box body;

110, cavity; 120, access opening;

111, steam outlet; 112, gas circulation chamber; 113, ventilation outlet; 114, air inlet; 115, fan; 116, raised portion; 117, air guide outlet;

200, box door;

300. Steam generating device;

400. Heating device;

410, heating tube;

500. Temperature detection device;

510. Temperature sensor;

600, absolute humidity sensor;

610, sensing end;

700. Refrigeration equipment;

800, thermal protection module;

900. 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 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 the current passes through two connected conductors, a temperature difference will be generated at the connection, that is, the connection will produce heat absorption and heat release. This effect was discovered by the Frenchman Jean-Charles Peltier in 1834. The amount of heat absorption and heat release 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 heat release surface can be changed by changing the direction of the current.

The standard humidity measuring instrument referred to in this article refers to a professional instrument that can accurately measure relative humidity.

The relative humidity referred to in this article refers to the percentage of the actual water vapor content in the air (absolute humidity) to the saturated humidity (maximum possible water vapor content) at the same temperature.

The relative humidity of 100% mentioned in this article refers to saturated humidity, that is, the amount of water vapor has reached the limit of the air's ability to accommodate water vapor.

The relative humidity of approximately zero percent referred to herein means that there is almost no water vapor in the air. Since it is difficult to achieve a relative humidity of zero percent in actual use, approximately zero percent meets the requirement. The meaning of approximately here is definite to those skilled in the art. In some cases, it can be considered that when the relative humidity reaches one percent, the relative humidity is approximately zero percent. In other cases, it can be considered that when the relative humidity reaches three percent, the relative humidity is approximately zero percent. In other words, those skilled in the art can define approximately zero percent as needed.

Please refer to Figures 2 to 7. The embodiments shown in Figures 2 to 7 provide a steam oven, which includes a cabinet 100, a cabinet door 200, a steam generating device 300, a heating device 400, a temperature detecting device 500, an absolute humidity sensor 600 and a control device 900.

The box body 100 has a cavity 110 for accommodating food and an access opening 120 connecting the outside with the cavity 110. In this document, the side where the access opening 120 is located is called the front side, and the other side opposite to it is called the rear side. Users can take in and put in food or tools such as baking trays 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 steam generating device 300 is used to introduce water vapor into the cavity 110 through the steam port 111 opened in the cavity 110. Exemplarily, the steam generating device 300 includes a water tank, a water tank heating element, a gas collecting component, and some necessary ventilation pipelines. The water tank is used to contain water, the water tank heating element is used to heat the water in the water tank to convert the water into water vapor, the gas collecting component is used to collect water vapor, and the ventilation pipeline is used to guide the water vapor collected by the gas collecting component into the cavity 110 through the steam port 111.

The heating device 400 is used to increase the temperature in the cavity 110, that is, to realize the baking function of the steam oven. The heating device 400 may include one or more heating tubes 410 located in the cavity 110, which heat the cavity 110 by emitting heat radiation. In some embodiments, when the heating tube 410 includes multiple heating tubes, the multiple heating tubes 410 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 410 can also be distributed at other positions of the cavity 110.

The temperature detection device 500 is used to obtain the temperature measurement value in the cavity 110. The temperature detection device 500 may include one or more temperature sensors 510 located in the cavity 110 to obtain the temperature measurement value in the cavity 110.

As shown in FIG. 4 , the absolute humidity sensor 600 is located in the cavity 110 , and the absolute humidity sensor 600 is used to obtain a humidity measurement value in the cavity 110 .

Generally speaking, as shown in FIG5 , the absolute humidity sensor 600 has a sensing end 610 for sensing humidity to obtain a humidity measurement value; in some embodiments, not all of the portion of the absolute humidity sensor 600 exposed to the air is used to sense humidity. In some embodiments, the position between the absolute humidity sensor 600 and the steam port 111 is also cleverly designed. Specifically, the end face of the sensing end 610 is located outside the area directly facing the air outlet direction of the steam port 111. In some embodiments, if the end face of the sensing end 610 is projected along its own axis, the projected position will not be located within the steam port 111, that is, the steam port 111 does not directly blow the end face of the sensing end 610 when the air is discharged. The setting that the airflow with water vapor does not directly blow the end face of the sensing end 610 helps to reduce the possibility of failure of the sensing end 610 of the absolute humidity sensor 600, thereby improving the reliability of use.

It should be noted that the airflow with water vapor not directly blowing the end surface of the sensing end 610 and the airflow with water vapor not directly blowing the absolute humidity sensor 600 are two different concepts. The airflow with water vapor can directly blow the non-sensing surface of the absolute humidity sensor 600. In this embodiment, the air outlet direction of the steam port 111 can be directly facing the side surface of the absolute humidity sensor 600 (the end surface of the sensing end 610 is the top surface).

In some embodiments, the absolute humidity sensor 600 and the steam port 111 are both located on the rear side wall of the cavity 110 , and the sensing end 610 of the absolute humidity sensor 600 faces the access opening 120 to avoid being directly blown by the airflow carrying water vapor.

As shown in FIG6 , the rear side wall may also have a hollow gas circulation chamber 112, the gas circulation chamber 112 has a ventilation port 113 connected to the cavity 110 and an air inlet connected to the steam generating device 300, and the steam port 111 is connected to the steam generating device 300 through the gas circulation chamber 112, that is, the water vapor generated by the steam generating device 300 first enters the gas circulation chamber 112 through the air inlet 114, and then enters the cavity 110 through the steam port 111. A fan 115 is also provided in the gas circulation chamber 112, and the fan 115 is in the dotted line frame in FIG6 , and a circle of heating pipes 410 is also provided around the outside of the dotted line frame. In other embodiments, the heating pipes 410 may also be provided in other shapes near the fan 115, and the heating pipes 410 can heat the food from the rear side of the cavity 110. When the fan 115 is working, it draws the gas in the cavity 110 into the gas circulation chamber 112 through the ventilation port 113, and discharges the gas in the gas circulation chamber 112 into the cavity 110 through the steam port 111. Through the operation of the fan 115, the water vapor discharged from the steam port 111 into the cavity 110 includes both the water vapor newly entering from the air inlet 114 and the water vapor circulating in the cavity 110, thereby improving the utilization efficiency of the water vapor.

In some scenarios, the volume of the fan 115 is relatively large, and the space of the gas circulation chamber 112 needs to protrude in order to accommodate the fan 115. The large gas circulation chamber 112 may cause the rear side wall to protrude toward the outside of the box 100, which increases the space occupied by the box 100 and affects the appearance. Therefore, in some embodiments, as shown in FIG. 4 and FIG. 7 , the rear side wall has a protrusion 116 protruding toward the cavity 110, the gas circulation chamber 112 is located in the protrusion 116, and the ventilation port 113 is opened on the top wall of the protrusion 116. By providing the protrusion 116, the rear side wall can have a larger gas circulation chamber 112 when the box 100 is of the same size.

When a portion of the rear side wall forms a protrusion 116 , a plurality of steam ports 111 may be opened along the circumference of the protrusion 116 , so that water vapor can diffuse around the protrusion 116 to form a good gas flow circulation in the cavity 110 . In addition, the air inlet 114 is located on one side of the fan 115, and the absolute humidity sensor 600 is located on the other side of the fan 115. For the convenience of description, the side where the air inlet 114 is located is defined as the first side, and the side where the absolute humidity sensor 600 is located is defined as the second side of the fan 115. Since water vapor enters the gas circulation chamber 112 from the air inlet 114, more new water vapor will accumulate on the first side relative to the second side. The water vapor discharged from the steam port 111 on the first side into the cavity 110 will be more than the water vapor discharged from the steam port 111 on the second side into the cavity 110. By arranging the air inlet and the absolute humidity sensor 600 on both sides of the fan 115, the airflow flowing to the absolute humidity sensor 600 can be reduced under the same conditions. In addition to the side wall of the protrusion 116, the steam port 111 can also be arranged on the top wall of the protrusion 116.

In some embodiments, as shown in FIG. 2 , the steam oven further includes a refrigeration device 700 and a heat protection module 800. The refrigeration device 700 is used to reduce the temperature in the cavity 110. The heat protection module 800 is arranged between the cavity 110 and the refrigeration device 700 to isolate the heat transfer from the cavity 110 to the refrigeration device 700. Exemplarily, the refrigeration device 700 can adopt semiconductor refrigeration technology, that is, the refrigeration device 700 includes a semiconductor refrigeration sheet. Two air guide ports 117 connected to the refrigeration device 700 are arranged on the side wall of the cavity 110. When the refrigeration device 700 is working, the gas in the cavity 110 is sucked into the refrigeration device 700 from one air guide port 117 and cooled by the semiconductor refrigeration sheet. The cooled gas enters the interior of the cavity 110 from the other air guide port 117, thereby reducing the temperature in the cavity 110.

When the steam oven also includes a refrigeration device 700 and a thermal protection module 800, similar to the absolute humidity sensor 600, the refrigeration device 700 and the thermal protection module 800 are both located on the second side of the fan 115, thereby reducing the high-temperature airflow containing water vapor blowing toward the refrigeration device 700 and the thermal protection module 800, thereby avoiding damage to the refrigeration device 700 and the thermal protection module 800.

In some embodiments, when the temperature detection device 500 includes at least two temperature sensors 510, at least one temperature sensor 510 in the temperature detection device 500 is disposed adjacent to the absolute humidity sensor 600, so as to cooperate with the absolute humidity sensor 600 to obtain the temperature measurement value and the humidity measurement value in the same area in the cavity 110. For example, a plurality of temperature sensors 510 may be distributed up and down in the cavity 110, and the absolute humidity sensor 600 is disposed adjacent to one of the temperature sensors 510. When the heating device 400 includes a plurality of heating tubes 410 distributed on the top wall and the side wall of the cavity 110, the area close to the top wall generally heats up faster, and the absolute humidity sensor 600 is disposed adjacent to the lowest temperature sensor 510, and being away from the high temperature area can reduce the probability of failure of the absolute humidity sensor 600.

The control device 900 is used to control various devices, components, etc. in the steam oven according to external input operations and/or data obtained by the steam oven. For example, the heating device 400 and/or the refrigeration device 700 can be controlled according to the temperature measurement value. In addition, the steam generating device 300 can also be controlled according to the humidity measurement value.

Based on the steam oven in any of the above embodiments, the present application further provides a humidity control method, which includes a target temperature acquisition step, a target relative humidity acquisition step, a first humidity control step, a humidity change acquisition step, and a second humidity control step. Wherein:

The purpose of the target temperature acquisition step is to determine how many degrees Celsius the user wants to set the cavity 110 to. The target temperature may be different for different ingredients or different cooking methods.

The purpose of the target relative humidity acquisition step is to determine the relative humidity that the user wants to achieve in the cavity 110. Since the maximum amount of water vapor that air can accommodate is different at different temperatures, the absolute humidity may be different at different temperatures even if the relative humidity is the same.

The purpose of the first humidity control step is to adjust the relative humidity in the cavity 110 to a reference relative humidity. The meaning of the reference relative humidity and the specific adjustment means are described below.

The purpose of the humidity change acquisition step is to acquire the humidity measurement value change after the relative humidity is adjusted to the reference relative humidity.

The purpose of the second humidity control step is to determine whether to take measures to readjust the relative humidity and how to readjust the relative humidity according to the change in the humidity measurement value.

Please refer to the embodiment shown in FIG8 , which provides a humidity control method, including the steps of:

Step S100: Obtain the target temperature set by the user for the oven cavity 110. The user can set the target temperature directly through the panel or knob of the oven, or the user can also set the target temperature remotely through a remote controller or other means.

In this embodiment, after obtaining the target temperature, the steam oven will determine whether to heat or cool the cavity 110 according to the relationship between the detected temperature measurement value and the target temperature. For example, if the current temperature in the cavity 110 is 30°C and the target temperature is 50°C, the cavity 110 is heated to reach the target temperature. As described above, even if the relative humidity is the same at different temperatures, the absolute humidity may be different. In this embodiment, the difference between the temperature measurement value and the target temperature is obtained, and the difference is compared with a preset difference threshold. When the difference is less than the difference threshold, step S200 is executed. That is, the humidity control is started only when the actual temperature in the cavity 110 is stable near the target temperature.

Step S200: adjusting the humidity of the air in the cavity 110 so that the relative humidity in the cavity 110 reaches a reference relative humidity.

The reference relative humidity may be any value between approximately zero percent and one hundred percent, preferably one hundred percent or approximately zero percent. These two values are mainly used as examples for description below.

When the reference relative humidity is 100%, the air in the cavity 110 is adjusted to a supersaturated state where no more water vapor can be contained. The relative humidity can be made to reach 100% by introducing an excessive amount of water vapor. For example, water vapor can be introduced into the cavity 110 within a preset time, and the length of the preset time should be sufficient to allow the cavity 110 to reach a supersaturated state. For example, for a cavity 110 of known capacity, if continuous introduction of water vapor for at least m seconds can allow the cavity 110 to reach a supersaturated state, then m seconds is the minimum value of the preset time. In addition, a preset amount of water vapor can be introduced into the cavity 110, and the preset amount is sufficient to allow the cavity 110 to reach a supersaturated state. For example, for a cavity 110 of known capacity, if introduction of n milliliters of water vapor can allow the cavity 110 to reach a supersaturated state, then n milliliters is the minimum value of the preset amount. After the relative humidity in the cavity 110 reaches 100%, the introduction of water vapor is temporarily stopped.

The reference relative humidity is approximately zero percent, that is, the air in the cavity 110 is adjusted to an undersaturated state with almost no water vapor. The air in the cavity 110 can be dried so that the relative humidity reaches approximately zero percent. In some embodiments, when the indoor air itself is relatively dry, the cavity 110 can reach an undersaturated state after standing for a period of time at the target temperature. In other embodiments, the air in the cavity 110 is heated within a preset time and/or at a predetermined heating power to dry the air. It should be noted that the heating and drying of the air should not cause an excessive deviation between the actual temperature in the cavity 110 and the target temperature. After the relative humidity in the cavity 110 reaches approximately zero percent, the air drying process is stopped.

The reference relative humidity can also be other values. If the reference relative humidity is lower than the relative humidity in the current cavity 110, the relative humidity in the current cavity 110 is made to reach the reference relative humidity through drying treatment, and then the drying treatment is temporarily stopped; if the reference relative humidity is higher than the relative humidity in the current cavity 110, the relative humidity in the current cavity 110 is made to reach the reference relative humidity by introducing water vapor, and then the introduction of water vapor is temporarily stopped.

In some embodiments, the reference relative humidity of other values may be determined in the following manner:

If the readings of a certain absolute humidity sensor 600 at the same temperature and the same relative humidity are approximately the same, then the relative humidity can be used as the reference relative humidity of the absolute humidity sensor 600 at the temperature. For example, if the readings of an absolute humidity sensor 600 at 100°C and 40% relative humidity fluctuate around a each time, then the relative humidity of 40% can be used as the reference relative humidity of the absolute humidity sensor 600 at 100°C. When the target temperature is 100°C, if the current reading of the absolute humidity sensor 600 is less than a, water vapor is introduced into the cavity 110 until the reading is close to or equal to a; if the current reading of the absolute humidity sensor 600 is greater than a, the air in the cavity 110 is dried until the reading is close to or equal to a.

Step S300 : controlling whether to introduce water vapor into the cavity 110 according to the relationship between the target relative humidity and the reference relative humidity.

This step is to change the relative humidity in the cavity 110 from the reference relative humidity to the target relative humidity. When the target relative humidity is greater than the reference relative humidity, water vapor is introduced into the cavity 110, and the relative humidity in the cavity 110 increases; when the target relative humidity is less than or equal to the reference relative humidity, water vapor is not introduced into the cavity 110, and the relative humidity in the cavity 110 decreases over time.

It is easy to understand that when the reference relative humidity is 100%, the target relative humidity is usually lower than the reference relative humidity. That is, when the reference relative humidity is 100%, after the relative humidity in the cavity 110 reaches the reference relative humidity, water vapor is not introduced into the cavity 110, so that the relative humidity in the cavity 110 approaches the target relative humidity from the reference relative humidity. When the reference relative humidity is approximately zero percent, the target relative humidity is usually higher than the reference relative humidity. That is, when the reference relative humidity is approximately zero percent, water vapor is introduced into the cavity 110, so that the relative humidity in the cavity 110 approaches the target relative humidity from the reference relative humidity.

Step S400 : obtaining a change in the humidity measurement value caused by whether water vapor is introduced into the cavity 110 .

In step S300, whether water vapor is introduced into the cavity 110 or not, the relative humidity in the cavity 110 will change from the reference relative humidity. During the change, the reading of the absolute humidity sensor 600 will change, and the change in the reading is the change in the humidity measurement value.

In some embodiments, when the baseline relative humidity is 100%, the first humidity measurement value obtained when the relative humidity in the cavity 110 reaches 100% is first recorded, and then a second humidity measurement value that changes with time after no water vapor is introduced into the cavity 110 is obtained. Based on the first humidity measurement value and the second humidity measurement value, the change in the humidity measurement value is obtained.

In some embodiments, when the baseline relative humidity is approximately zero percent, a first humidity measurement value obtained when the relative humidity in cavity 110 reaches approximately zero percent is first recorded, and then a second humidity measurement value that changes with time after water vapor is introduced into cavity 110 is obtained. Based on the first humidity measurement value and the second humidity measurement value, the change in the humidity measurement value can be obtained.

When the reference relative humidity is other values, the method for obtaining the change in the humidity measurement value is similar to the above, and will not be described in detail here.

Step S500: compare the humidity measurement value change with the change threshold, and control the introduction of water vapor into the cavity 110 according to the comparison result.

Among them, the change threshold is determined based on the target temperature and the target relative humidity, that is, the change threshold is related to two factors: the target temperature and the target relative humidity. In some embodiments, after obtaining the target temperature and the target relative humidity, to obtain the change threshold, it is necessary to obtain the corresponding pre-set relationship table according to the target temperature, and the relationship table includes the change in humidity measurement value when the relative humidity changes from the base relative humidity to N percent at the corresponding target temperature. The relationship table corresponding to each temperature that the user allows to adjust can be pre-stored. For example, the steam oven allows the user to set the target temperature to any integer between 30°C and 100°C, and each integer pair between 30°C and 100°C has a corresponding relationship table. The following takes T°C as an example to explain how to obtain the relationship table corresponding to T°C.

First, place the absolute humidity sensor 600 used on the steam oven and the standard humidity measuring instrument in an environment with the same relative humidity at T℃, adjust the relative humidity in the environment until the standard humidity measuring instrument shows that the relative humidity reaches the reference relative humidity, record the reading of the absolute humidity sensor 600 at this time, and record it as X. Next, adjust the relative humidity in the environment until the standard humidity measuring instrument shows that the relative humidity reaches N percent, record the reading of the absolute humidity sensor 600 at this time, and record it as Y. Based on the above steps, the humidity measurement value change Z that occurs when the relative humidity changes from the reference relative humidity to N percent at T℃ can be obtained, Z=|X-Y|, and then the relationship table corresponding to T℃ can be obtained.

By introducing the change in humidity measurement value, the error existing in the absolute humidity sensor 600 itself can be effectively eliminated without adding additional structures. For example, at T℃, the reference relative humidity is 100%, and in the relationship table of an absolute humidity sensor 600, the change threshold for adjusting the relative humidity from 100% to 80% is 600kg/m ³ , then as long as the current relative humidity is determined to be 100%, no matter what the humidity measurement value (reading) of the absolute humidity sensor 600 is, as long as the reading drops by 600kg/m ³ from the relative humidity of 100%, it means that the relative humidity has reached 80%, thereby eliminating the measurement error of the absolute humidity sensor 600 as much as possible and obtaining a more accurate measurement result.

When the change in the humidity measurement value is caused by not introducing water vapor into the cavity 110, if the change in the humidity measurement value is less than the change threshold, water vapor is not introduced into the cavity 110. If the change in the humidity measurement value reaches the change threshold, the above steps S200, S300 and S400 are repeated.

For example, the reference relative humidity is 100%, the target relative humidity is 80%, and the change threshold is 600kg/m ³ . After the relative humidity in the cavity 110 reaches 100%, water vapor is no longer introduced into the cavity 110, and the change in the humidity measurement value is caused by not introducing water vapor into the cavity 110. When the change in the humidity measurement value does not reach 600kg/m ³ , water vapor is not introduced, and the relative humidity continues to decrease. When the change in the humidity measurement value reaches 600kg/m ³ , it indicates that the target relative humidity is reached. At this time, water vapor is introduced again until it reaches a supersaturated state and then stopped. When the change in the humidity measurement value reaches the change threshold again, the above steps S200, S300, and S400 are repeatedly executed.

When the change in the humidity measurement value is caused by the introduction of water vapor into the cavity 110, if the change in the humidity measurement value is less than the change threshold, continue to introduce water vapor into the cavity 110; if the change in the humidity measurement value reaches the change threshold, repeat the above steps S200, S300 and S400.

For example, the reference relative humidity is approximately zero percent, the target relative humidity is twenty percent, and the change threshold is 400 kg/m ³ . After the relative humidity in the cavity 110 reaches approximately zero percent, water vapor is introduced into the cavity 110, and the change in the humidity measurement value is caused by the introduction of water vapor into the cavity 110. When the change in the humidity measurement value does not reach 400 kg/m ³ , water vapor continues to be introduced, and the relative humidity continues to rise. When the change in the humidity measurement value reaches 400 kg/m ³ , it indicates that the target relative humidity is reached. At this time, the drying process is started again until it reaches an undersaturated state, and then the drying process is stopped. When the change in the humidity measurement value reaches the change threshold again, the above steps S200, S300, and S400 are repeatedly executed.

It can be seen from the above description that after the relative humidity in the cavity 110 reaches the target relative humidity, the present embodiment does not stop the subsequent operation, but continuously repeats the process from the reference relative humidity to the target relative humidity. This is because the inventors found that in the field of steam ovens, it is very difficult to stabilize the relative humidity in the cavity 110 at a value, and this uncontrollable state is not conducive to the cooking of food. By repeating the process from the reference relative humidity to the target relative humidity, it can be ensured that the relative humidity can reach the target relative humidity every time, thereby improving the cooking effect of the food.

In addition, when the target temperature or target relative humidity is reset, the change threshold is also determined based on the reset target temperature or target relative humidity, and the above steps S200, S300, and S400 are performed again based on the re-determined change threshold. For example, the reference relative humidity is 100%, the target relative humidity is 80%, the target temperature is 100°C, and the change threshold determined based on the target temperature and the target relative humidity is 600kg/ ^m3 . If the user changes the target relative humidity from 80% to 90% during the process of relative humidity decreasing after reaching the reference relative humidity, then water vapor is introduced again to make the cavity 110 reach an oversaturated state, and a new change threshold is determined based on the new target relative humidity and target temperature.

The inventors have also found in practice that not all relative humidities are used in the cooking of ingredients, but there are commonly used relative humidities. In some embodiments, multiple preset humidity levels are provided, and each humidity level has a corresponding relative humidity. The user's selection of a humidity level is received, and the relative humidity corresponding to the humidity level selected by the user is set as the target relative humidity. For example, the humidity level can be 20%, 40%, 60%, and 80%. By setting the humidity level, on the one hand, the user's operation is simplified, and on the other hand, the amount of data in the relationship table can be reduced.

The steam oven and humidity control method in the above-mentioned embodiment reduce or eliminate the measurement error of the absolute humidity sensor itself, so as to better control the relative humidity in the cavity and obtain the expected cooking effect. In addition, the reliability of the absolute humidity sensor in use is improved through various designs.

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 (29)

1. A humidity control method for a steam oven, characterized by comprising:

   a target temperature acquisition step, acquiring a target temperature set by a user for a cavity of the steam oven, the cavity being used to contain food;

   a target relative humidity acquisition step, acquiring the target relative humidity set by the user for the cavity;

   a first humidity control step of introducing water vapor into the cavity so that after the relative humidity in the cavity reaches 100%, no water vapor is introduced into the cavity;

   A humidity change acquisition step, acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change caused by not introducing water vapor into the cavity after the relative humidity in the cavity reaches 100%;

   The second humidity control step is to compare the change in the humidity measurement value with a change threshold, and control the introduction of water vapor into the cavity according to the comparison result, wherein the change threshold is determined based on the target temperature and the target relative humidity.
2. The method according to claim 1, characterized in that controlling the introduction of water vapor into the cavity according to the comparison result comprises:

   When the change in the humidity measurement value reaches the change threshold, performing the first humidity control step, the humidity change acquisition step and the second humidity control step again;

   When the change in the humidity measurement value is less than the change threshold, water vapor continues to not be introduced into the cavity.
3. The method according to claim 1 or 2, characterized in that the step of introducing water vapor into the cavity so that the relative humidity in the cavity reaches 100%, and then not introducing water vapor into the cavity, comprises:

   After water vapor is introduced into the cavity within a preset time, and/or after a preset amount of water vapor is introduced into the cavity, water vapor is no longer introduced into the cavity.
4. The method according to any one of claims 1 to 3, characterized in that the step of obtaining the humidity measurement value in the cavity and obtaining the humidity measurement value change caused by not introducing water vapor into the cavity after the relative humidity in the cavity reaches 100% comprises:

   Recording a first humidity measurement value obtained when the relative humidity in the cavity reaches 100 percent;

   Obtaining a second humidity measurement value that changes with time when no water vapor is introduced into the cavity;

   The humidity measurement value change is obtained based on the first humidity measurement value and the second humidity measurement value.
5. The method according to any one of claims 1 to 4, characterized in that the change threshold is determined based on the target temperature and the target relative humidity, comprising:

   Acquire a corresponding preset first relationship table according to the target temperature, wherein the first relationship table includes a humidity measurement value change amount that occurs when the relative humidity changes from 100% to N% at the corresponding target temperature;

   The change threshold of the relative humidity from 100% to the target relative humidity is obtained according to the target relative humidity and the first relationship table.
6. A humidity control method for a steam oven, characterized by comprising:

   a target temperature acquisition step, acquiring a target temperature set by a user for a cavity of the steam oven, the cavity being used to contain food;

   a target relative humidity acquisition step, acquiring the target relative humidity set by the user for the cavity;

   a first humidity control step of drying the air in the cavity so that the relative humidity in the cavity reaches approximately zero percent, and then introducing water vapor into the cavity;

   a humidity change acquisition step, acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change caused by introducing water vapor into the cavity after the relative humidity in the cavity reaches approximately zero percent;

   The second humidity control step is to compare the change in the humidity measurement value with a change threshold, and control the introduction of water vapor into the cavity according to the comparison result, wherein the change threshold is determined based on the target temperature and the target relative humidity.
7. The method according to claim 6, characterized in that controlling the introduction of water vapor into the cavity according to the comparison result comprises:

   When the change in the humidity measurement value reaches the change threshold, stop introducing water vapor into the cavity, and perform the first humidity control step, the humidity change acquisition step, and the second humidity control step again;

   When the change in the humidity measurement value is less than the change threshold, water vapor continues to be introduced into the cavity.
8. The method according to claim 6 or 7, characterized in that the drying of the air in the cavity comprises:

   The air in the cavity is heated and dried within a preset time and/or with a predetermined heating power.
9. The method according to any one of claims 6 to 8, characterized in that the step of obtaining the humidity measurement value in the cavity to obtain the humidity measurement value change caused by introducing water vapor into the cavity after the relative humidity in the cavity reaches approximately zero percent comprises:

   Recording a first humidity measurement value obtained when the relative humidity in the cavity reaches approximately zero percent;

   Obtaining a second humidity measurement value that changes with time after water vapor is introduced into the cavity;

   The humidity measurement value change is obtained based on the first humidity measurement value and the second humidity measurement value.
10. The method according to any one of claims 6 to 9, characterized in that the change threshold is determined based on the target temperature and the target relative humidity, comprising:

    Acquire a corresponding preset second relationship table according to the target temperature, wherein the second relationship table includes a humidity measurement value change amount that occurs when the relative humidity changes from approximately 100 percent to N percent at the corresponding target temperature;

    The change threshold of the relative humidity from approximately zero percent to the target relative humidity is determined according to the target relative humidity and the second relationship table.
11. A humidity control method for a steam oven, characterized by comprising:

    a target temperature acquisition step, acquiring a target temperature set by a user for a cavity of the steam oven, wherein the cavity is used to contain food;

    a target relative humidity acquisition step, acquiring the target relative humidity set by the user for the cavity;

    a first humidity control step of adjusting the humidity of the air in the cavity so that the relative humidity in the cavity reaches a reference relative humidity, and then controlling whether to introduce water vapor into the cavity according to the relationship between the target relative humidity and the reference relative humidity;

    a humidity change acquisition step, acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change amount caused by whether water vapor is introduced into the cavity after the relative humidity in the cavity reaches a reference relative humidity;

    The second humidity control step is to compare the change in the humidity measurement value with a change threshold, and control the introduction of water vapor into the cavity according to the comparison result, wherein the change threshold is determined based on the target temperature and the target relative humidity.
12. The method according to claim 11, characterized in that the step of adjusting the humidity of the air in the cavity so that the relative humidity in the cavity reaches a reference relative humidity comprises:

    Drying the air in the cavity so that the relative humidity in the cavity reaches a reference relative humidity; or

    The air in the cavity is humidified so that the relative humidity in the cavity reaches a reference relative humidity.
13. The method according to claim 12, characterized in that the drying process of the air in the cavity comprises: heating and drying the air in the cavity within a preset time and/or with a predetermined heating power;

    The humidifying process for the air in the cavity includes: introducing water vapor into the cavity within a preset time, and/or introducing a preset amount of water vapor into the cavity.
14. The method according to claim 11, characterized in that the step of controlling whether to introduce water vapor into the cavity according to the relationship between the target relative humidity and the reference relative humidity comprises:

    When the target relative humidity is greater than the reference relative humidity, introducing water vapor into the cavity;

    When the target relative humidity is less than or equal to the reference relative humidity, water vapor is not introduced into the cavity.
15. The method according to claim 11, characterized in that, when the change in the humidity measurement value is caused by not introducing water vapor into the cavity, controlling the introduction of water vapor into the cavity according to the comparison result comprises:

    When the change in the humidity measurement value reaches the change threshold, performing the first humidity control step, the humidity change acquisition step and the second humidity control step again;

    When the change in the humidity measurement value is less than the change threshold, water vapor is not introduced into the cavity.
16. The method according to claim 11, characterized in that, when the change in the humidity measurement value is caused by the introduction of water vapor into the cavity, controlling the introduction of water vapor into the cavity according to the comparison result comprises:

    When the change in the humidity measurement value reaches the change threshold, stop introducing water vapor into the cavity, and perform the first humidity control step, the humidity change acquisition step, and the second humidity control step again;

    When the change in the humidity measurement value is less than the change threshold, water vapor continues to be introduced into the cavity.
17. The method according to claim 11, characterized in that the step of obtaining the humidity measurement value in the cavity and obtaining the humidity measurement value change caused by whether water vapor is introduced into the cavity after the relative humidity in the cavity reaches the reference relative humidity comprises:

    Recording a first humidity measurement value obtained when the relative humidity in the cavity reaches the reference relative humidity;

    Acquire a second humidity measurement value that changes with time after the relative humidity in the cavity reaches the reference relative humidity;

    The humidity measurement value change is obtained based on the first humidity measurement value and the second humidity measurement value.
18. The method according to claim 15, wherein the change threshold is determined based on the target temperature and the target relative humidity, comprising:

    Acquire a corresponding preset relationship table according to the target temperature, wherein the relationship table includes a humidity measurement value change amount that occurs when the relative humidity changes from a reference relative humidity to N percent at the corresponding target temperature;

    The change threshold of the relative humidity from the reference relative humidity to the target relative humidity is determined according to the target relative humidity and the relationship table.
19. The method according to claim 1, 6 or 11, characterized in that the method further comprises:

    Monitor the target relative humidity set by the user. When the target relative humidity is reset, redetermine the change threshold value according to the target temperature value and the reset target relative humidity, and execute the first humidity control step, the humidity change acquisition step and the second humidity control step again based on the redetermined change threshold value.
20. The method according to claim 1, 6 or 11, characterized in that after the target temperature acquisition step, the method further comprises:

    Obtain a temperature measurement value in the cavity, obtain a difference between the temperature measurement value and the target temperature, compare the difference with a preset difference threshold, and when the difference is less than the difference threshold, execute the first humidity control step, otherwise do not execute the first humidity control step.
21. The method according to claim 1, 6 or 11, characterized in that the obtaining of the user's setting of the target relative humidity in the cavity comprises:

    Providing a plurality of preset humidity levels, each of the humidity levels having a corresponding relative humidity;

    A user's selection of the humidity level is received, and the relative humidity corresponding to the humidity level selected by the user is set as the target relative humidity.
22. 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 steam generating device for generating water vapor for passing into the cavity;

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

    A temperature detection device, the temperature detection device is used to obtain a temperature measurement value in the cavity;

    an absolute humidity sensor, the absolute humidity sensor being located in the cavity and being used to obtain a humidity measurement value in the cavity;

    A control device for performing the following steps:

    a target temperature acquisition step, acquiring a target temperature set by a user for the cavity;

    a target relative humidity acquisition step, acquiring the target relative humidity set by the user for the cavity;

    A first humidity control step, controlling the steam generating device to pass water vapor into the cavity, so that after the relative humidity in the cavity reaches 100%, the steam generating device is controlled not to pass water vapor into the cavity;

    a humidity change acquisition step, acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change caused by controlling the steam generating device not to introduce water vapor into the cavity after the relative humidity in the cavity reaches 100%;

    The second humidity control step is to compare the change in the humidity measurement value with a change threshold, and control the introduction of water vapor into the cavity according to the comparison result, wherein the change threshold is determined based on the target temperature and the target relative humidity.
23. The steam oven according to claim 22, characterized in that the step of controlling the introduction of water vapor into the cavity according to the comparison result comprises:

    When the change in the humidity measurement value reaches the change threshold, performing the first humidity control step, the humidity change acquisition step and the second humidity control step again;

    When the change in the humidity measurement value is less than the change threshold, water vapor continues to not be introduced into the cavity.
24. 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 steam generating device for generating water vapor for passing into the cavity;

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

    A temperature detection device, the temperature detection device is used to obtain a temperature measurement value in the cavity;

    an absolute humidity sensor, the absolute humidity sensor being located in the cavity and being used to obtain a humidity measurement value in the cavity;

    A control device for performing the following steps:

    a target temperature acquisition step, acquiring a target temperature set by a user for the cavity;

    a target relative humidity acquisition step, acquiring the target relative humidity set by the user for the cavity;

    a first humidity control step of drying the air in the cavity so that the relative humidity in the cavity reaches approximately zero percent, and then controlling the steam generating device to pass water vapor into the cavity;

    a humidity change acquisition step, acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change amount caused by controlling the steam generating device to pass water vapor into the cavity after the relative humidity in the cavity reaches approximately zero percent;

    The second humidity control step is to compare the change in the humidity measurement value with a change threshold, and control the introduction of water vapor into the cavity according to the comparison result, wherein the change threshold is determined based on the target temperature and the target relative humidity.
25. The steam oven according to claim 24, characterized in that the step of controlling the introduction of water vapor into the cavity according to the comparison result comprises:

    When the change in the humidity measurement value reaches the change threshold, stop introducing water vapor into the cavity, and perform the first humidity control step, the humidity change acquisition step, and the second humidity control step again;

    When the change in the humidity measurement value is less than the change threshold, water vapor continues to be introduced into the cavity.
26. 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 steam generating device for generating water vapor for passing into the cavity;

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

    A temperature detection device, the temperature detection device is used to obtain a temperature measurement value in the cavity;

    an absolute humidity sensor, the absolute humidity sensor being located in the cavity and being used to obtain a humidity measurement value in the cavity;

    A control device for performing the following steps:

    a target temperature acquisition step, acquiring a target temperature set by a user for the cavity;

    a target relative humidity acquisition step, acquiring the target relative humidity set by the user for the cavity;

    a first humidity control step of adjusting the humidity of the air in the cavity so that the relative humidity in the cavity reaches a reference relative humidity, and then controlling whether the steam generating device introduces water vapor into the cavity according to the relationship between the target relative humidity and the reference relative humidity;

    a humidity change acquisition step, acquiring a humidity measurement value in the cavity, and obtaining a humidity measurement value change amount caused by controlling whether the steam generating device passes water vapor into the cavity after the relative humidity in the cavity reaches a reference relative humidity;

    The second humidity control step is to compare the change in the humidity measurement value with a change threshold, and control the introduction of water vapor into the cavity according to the comparison result, wherein the change threshold is determined based on the target temperature and the target relative humidity.
27. The steam oven according to claim 26, characterized in that, when the change in the humidity measurement value is caused by not introducing water vapor into the cavity, controlling the introduction of water vapor into the cavity according to the comparison result comprises:

    When the change in the humidity measurement value reaches the change threshold, performing the first humidity control step, the humidity change acquisition step and the second humidity control step again;

    When the change in the humidity measurement value is less than the change threshold, water vapor continues to not be introduced into the cavity.
28. The steam oven according to claim 26, characterized in that, when the change in the humidity measurement value is caused by the introduction of water vapor into the cavity, controlling the introduction of water vapor into the cavity according to the comparison result comprises:

    When the change in the humidity measurement value reaches the change threshold, stop introducing water vapor into the cavity, and perform the first humidity control step, the humidity change acquisition step, and the second humidity control step again;

    When the change in the humidity measurement value is less than the change threshold, water vapor continues to be introduced into the cavity.
29. 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 according to any one of claims 1 to 21.

Images