CN110507183B - Dry burning protection method for cooking appliance, cooking appliance and storage medium - Google Patents
Dry burning protection method for cooking appliance, cooking appliance and storage medium Download PDFInfo
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
- A47J27/086—Pressure-cookers; Lids or locking devices specially adapted therefor with built-in heating means
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
- A47J27/09—Safety devices
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Abstract
The application discloses a dry-burning protection method for a cooking appliance, the cooking appliance and a storage medium, relates to the field of household appliances, and can solve the technical problem that an electric pressure cooker is dry-burned because a temperature measuring sensor detects inaccurate temperature. The method may be applied to a cooking appliance. The cooking utensil comprises a pot body, a pot cover and an inner container, the inner container is placed in the pot body, and a temperature measuring sensor and a heating device are arranged at the bottom of the pot body. After the inner container is put into the pot body, the following method is executed: acquiring a first temperature change value of the bottom of the cooking appliance in a first preset time period at the starting moment of cooking; if the first temperature change value is within the preset interval, judging that the temperature sensor and the inner container are in cold-hot state balance; and after the cold state and the hot state are balanced, controlling the cooking appliance to perform dry burning detection, and stopping heating the cooking appliance in the dry burning state or heating the cooking appliance by adopting reduced heating power.
Description
Technical Field
The application relates to the field of household appliances, in particular to a dry burning protection method for a cooking appliance, the cooking appliance and a storage medium.
Background
With the development of the field of household appliances, especially with the introduction of cooking appliances such as electric pressure cookers into each household, users have higher requirements for the use safety of the cooking appliances. Taking an electric pressure cooker as an example, the electric pressure cooker in the market generally has a dry burning protection function, and aims to prevent a user from realizing the dry burning protection of the electric pressure cooker by stopping heating under the condition that water is not injected into an inner container of the electric pressure cooker or the water in the inner container is dried. Therefore, the safety problems of the electric pressure cooker, such as fire, caused by dry burning can be effectively prevented, and the use safety of the electric pressure cooker is improved.
At present, the triggering of the dry burning protection function is usually performed after the electric pressure cooker is heated to a certain temperature limit point, and the heating of the electric pressure cooker is stopped at the moment. However, in the actual working process of the electric pressure cooker, the temperature detected by the temperature measuring sensor arranged at the bottom of the electric pressure cooker is inaccurate due to the influence of the environment and the like. For example, when the temperature detected by the temperature measuring sensor is lower than the actual temperature, it is likely that the temperature at the bottom of the electric pressure cooker reaches the limit temperature, but the heating of the electric pressure cooker is not stopped, so that the electric pressure cooker can be still burned.
Disclosure of Invention
The application provides a dry-burning protection method for a cooking appliance, the cooking appliance and a storage medium, which are used for solving the technical problem that the electric pressure cooker is dry-burned because a temperature measuring sensor detects inaccurate temperature.
In order to solve the above problems, the technical solution provided by the present application is as follows:
in a first aspect, embodiments of the present application provide a dry-fire protection method for a cooking appliance. The method may be applied to a cooking appliance. The cooking utensil comprises a pot body, a pot cover and an inner container, the inner container is placed in the pot body, and a temperature measuring sensor and a heating device are arranged at the bottom of the pot body. After the inner container is put into the pot body, the following method is executed: acquiring a first temperature change value of the bottom of the cooking appliance in a first preset time period at the starting moment of cooking; if the first temperature change value is within the preset interval, judging that the temperature sensor and the inner container are in cold-hot state balance; and after the cold state and the hot state are balanced, controlling the cooking appliance to perform dry burning detection, and stopping heating the cooking appliance in the dry burning state or heating the cooking appliance by adopting reduced heating power.
In one implementation, the process of detecting dry burning of the cooking appliance can be implemented as follows: acquiring a second temperature change value of the bottom of the cooking utensil in a second preset time period, wherein the starting time of the second preset time period is the ending time of the first preset time period; and determining that the cooking appliance with the second temperature change value larger than or equal to the first threshold value is in a dry-burning state according to the magnitude relation between the second temperature change value and the first threshold value.
In one implementation, the first temperature variation value is an absolute value of a difference between a first temperature value and a second temperature value, the first temperature value is a temperature value of the bottom of the cooking appliance at a start time of a first preset time period, and the second temperature value is a temperature value of the bottom of the cooking appliance at an end time of the first preset time period.
In one implementation, the obtaining of the second temperature variation value of the bottom of the cooking appliance in the second preset time period may be implemented as: controlling the cooking appliance to stop heating at the ending time of the second preset time period, and acquiring a third temperature value of the bottom of the cooking appliance; and determining a difference value between the third temperature value and the second temperature value as a second temperature change value, wherein the second temperature value is a temperature value of the bottom of the cooking utensil at the ending moment of the first preset time period.
In one implementation, the value of the second preset time period is matched with at least one of a basic parameter of the cooking appliance, a called cooking function and an environmental parameter.
In one implementation, if the first temperature variation value is within a preset interval, the method may further include: and controlling the cooking appliance to detect the low water quantity, and stopping heating the cooking appliance in the low water quantity state or heating the cooking appliance by adopting the reduced heating power.
In one implementation, the temperature change value of the bottom of the cooking appliance in the low water state is positively correlated with the time.
In one implementation, the process of the cooking appliance performing low water detection may be implemented as: acquiring a third temperature change value of the bottom of the cooking appliance in a third preset time period; if the third temperature change value is greater than or equal to the second threshold, updating the third preset time period to a next time period adjacent to the third preset time period, obtaining the third temperature change value at the bottom of the cooking appliance again, comparing the third temperature change value with the second threshold until the continuous occurrence frequency of the third temperature change value greater than or equal to the second threshold reaches the preset frequency, and determining that the cooking appliance is in a low water level state; and if the third temperature change value is smaller than the second threshold value, ending the low water quantity detection of the cooking appliance at this time.
In a second aspect, embodiments of the present application provide a cooking appliance. The cooking utensil comprises a pot body, a pot cover and an inner container, the inner container is placed in the pot body, and a temperature measuring sensor and a heating device are arranged at the bottom of the pot body. The cooking appliance may further include:
the acquisition module is used for acquiring a first temperature change value of the bottom of the cooking appliance in a first preset time period at the cooking starting moment after the inner container is placed into the pot body.
And the processing module is used for judging that the temperature sensor and the inner container are in cold-hot state balance if the first temperature change value acquired by the acquisition module is within a preset interval.
And the control module is used for controlling the cooking appliance to carry out dry-burning detection after the processing module determines that the cold state and the hot state are balanced, and stopping heating the cooking appliance in the dry-burning state or heating the cooking appliance by adopting reduced heating power.
In one implementation, the control module is further configured to obtain a second temperature variation value of the bottom of the cooking appliance within a second preset time period, and a start time of the second preset time period is an end time of the first preset time period.
And the processing module is further used for determining that the cooking appliance with the second temperature change value larger than or equal to the first threshold value is in a dry-burning state according to the magnitude relation between the second temperature change value and the first threshold value.
In one implementation, the first temperature variation value is an absolute value of a difference between a first temperature value and a second temperature value, the first temperature value is a temperature value of the bottom of the cooking appliance at a start time of a first preset time period, and the second temperature value is a temperature value of the bottom of the cooking appliance at an end time of the first preset time period.
In one implementation, the control module is further configured to control the cooking appliance to stop heating at an end time of the second preset time period, and acquire a third temperature value of the bottom of the cooking appliance through the acquisition module.
And the processing module is further used for determining a difference value between the third temperature value and the second temperature value as a second temperature change value, wherein the second temperature value is a temperature value of the bottom of the cooking appliance at the end time of the first preset time period.
In one implementation, the value of the second preset time period is matched with at least one of a basic parameter of the cooking appliance, a called cooking function and an environmental parameter.
In one implementation, the control module is further configured to control the cooking appliance to perform low water detection if the first temperature variation value is within a preset interval, and stop heating the cooking appliance in a low water state or perform heating with reduced heating power.
In one implementation, the temperature change value of the bottom of the cooking appliance in the low water state is positively correlated with the time.
In one implementation, the obtaining module is further configured to obtain a third temperature variation value of the bottom of the cooking appliance in a third preset time period.
The processing module is further configured to update the third preset time period to a next time period adjacent to the third preset time period if the third temperature change value is greater than or equal to the second threshold, and compare the third temperature change value at the bottom of the cooking appliance with the second threshold again through the obtaining module until the number of times that the third temperature change value is greater than or equal to the second threshold appears continuously reaches the preset number of times, so as to determine that the cooking appliance is in a low water level state; if the third temperature variation value is smaller than the second threshold value, the control module ends the low water detection of the cooking appliance at this time.
In a third aspect, the present application provides a cooking appliance comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of the first aspect and any of its various possible implementations when executing the computer program.
In a fourth aspect, the present application provides a computer-readable storage medium. The storage medium stores a computer program which, when executed by a processor, implements the method of the first aspect described above and any of its various possible implementations.
Compared with the situation that the temperature measuring sensor detects inaccurate temperature and the electric pressure cooker burns dry in the prior art, in the embodiment of the application, whether the temperature measuring sensor and the inner container are balanced in a cold and hot state or not is determined by combining the acquired first temperature change value, and the cooking appliance is controlled to burn dry in the situation that the temperature measuring sensor and the inner container are balanced in the cold and hot state, so that the cooking appliance in the dry burning state is heated by stopping heating or adopting reduced heating power, and the dry burning protection of the cooking appliance is realized.
The first temperature change value reflects the temperature change degree of the bottom of the cooking appliance in a period of time, and the temperature change degree can often reflect whether the overall cold and hot states of the cooking appliance are balanced. For the cooking utensil with balanced cold and hot states, the accuracy of the temperature detected by the subsequent temperature measuring sensor is higher, so that the inaccurate temperature detected by the temperature measuring sensor can be effectively avoided. Under the relatively accurate temperature measurement condition, the cooking utensil can realize corresponding dry combustion method and detect according to the temperature that detects to realize dry combustion method protection under the condition that needs take dry combustion method protection.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a first flowchart of a dry-fire protection method for a cooking appliance according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a dry-fire protection method for a cooking appliance according to an embodiment of the present disclosure;
fig. 3 is a flow chart of a dry-fire protection method for a cooking appliance according to an embodiment of the present application;
fig. 4 is a flowchart illustrating a dry-fire protection process of a cooking appliance according to an embodiment of the present disclosure;
fig. 5 is a fourth flowchart of a dry-fire protection method for a cooking appliance according to an embodiment of the present application;
fig. 6 is a flowchart of a dry-fire protection method for a cooking appliance according to an embodiment of the present application;
fig. 7 is a flow chart of low water protection of a cooking appliance according to an embodiment of the present disclosure;
fig. 8 is a first schematic structural diagram of a cooking appliance according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a cooking appliance according to an embodiment of the present application.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.
The embodiment of the application provides a cooking appliance. The cooking utensil can comprise a pot body, a pot cover and an inner container. The inner container is arranged in the pot body, and the bottom of the pot body is provided with a temperature sensor and a heating device. Wherein, temperature sensor can be used for detecting the temperature of cooking utensil bottom, and heating device can be with heating inner bag to the material that makes to hold in the inner bag obtains the culinary art. In the embodiment of the present application, the cooking appliance may be a food processing device such as an electric pressure cooker, and the kind of the cooking appliance is not limited herein.
The embodiment of the application provides a dry-burning protection method for a cooking appliance, which can be applied to the cooking appliance, and after an inner container is placed in a pot body, the method steps shown in figure 1 can be executed:
s101, acquiring a first temperature change value of the bottom of the cooking appliance in a first preset time period at the starting time of cooking.
The first temperature change value is an absolute value of a difference value between a first temperature value and a second temperature value, the first temperature value is a temperature value of the bottom of the cooking utensil at the starting moment of a first preset time period, and the second temperature value is a temperature value of the bottom of the cooking utensil at the ending moment of the first preset time period.
In this embodiment, the first preset time period may be a time period after the cooking appliance starts to heat, and the starting time of the first preset time period may be the starting time of the heating process or a certain time in the heating process. For the case of intermittent heating, the starting time of the first preset time period may be the starting time of the whole heating process, or a certain time in the whole heating process, that is, the state corresponding to the real time of the first preset time period may be stop heating, start heating, or heating.
It should be noted that, the setting manner, specific value, and the like of the parameters, such as the duration of the first preset time period, the start time and the end time of the first preset time period, are not limited herein.
The first temperature value and the second temperature value may be the same or different. In the case that the first temperature value is different from the second temperature value, the first temperature value may be smaller than the second temperature value, or the first temperature value may be larger than the second temperature value.
For example, the temperature of the pot body of the cooking appliance is low, and the pot body is in a cold pot state, so that the temperature of the inner container can be raised to a high temperature in a short time after the inner container is heated, and for the pot body in the cold pot state, the temperature is gradually raised to a temperature close to the inner container from a low temperature. In the process, the data detected by the temperature measuring sensor is influenced by the ambient temperature (namely, the data is influenced by the low temperature of the pot body), and can generate large fluctuation. At this time, the detected first temperature value is usually smaller than the second temperature value, and the absolute value of the difference between the first temperature value and the second temperature value is larger.
For another example, after the cooking device is heated for a period of time, the temperature of the pot body is high, and the pot body is in a hot pot state, so that after cold water is injected into the inner container, the temperature of the inner container is reduced to a low temperature in a short time, and for the pot body in the hot pot state, the temperature is gradually reduced from a high temperature to a temperature close to the inner container. In the process, the data detected by the temperature measuring sensor is influenced by the ambient temperature (namely the high temperature of the pot body), and can generate large fluctuation. At this time, the detected first temperature value is usually greater than the second temperature value, and the absolute value of the difference between the first temperature value and the second temperature value is larger.
It can be seen that the difference between the first temperature value and the second temperature value can be either positive or negative. In the embodiment of the present application, whether the temperature sensor and the liner are in cold-hot state balance or not can be determined according to the absolute value of the difference, that is, whether the temperature detected by the temperature sensor is relatively stable and effective can be determined, which may be referred to as S102.
And S102, if the first temperature change value is within a preset interval, judging that the temperature sensor and the inner container are in cold-hot state balance.
The preset interval may be preset before the cooking appliance leaves a factory, and may be specifically determined according to one or more of parameters such as a historical experience value, a delay of the temperature measurement sensor, and a measurement accuracy of the temperature measurement sensor. The subsequent user can adjust the preset interval according to one or more of the parameters such as the specific requirement of dry burning protection, the loss degree of the cooking utensil and the like. It should be noted that, in the embodiment of the present application, the setting manner, the adjusting manner, the specific value, and the like of the preset interval are not limited.
In this embodiment of the application, the preset interval may be a value range, or, in an implementation manner, the first temperature change value may be compared with a constant to determine whether the temperature sensor and the inner container are in cold-hot state balance. For example, when the first temperature variation value is smaller than the preset constant, it is determined that the temperature sensor and the inner container are in cold-hot state balance. The setting mode, the adjusting mode, the specific value, and the like of the preset constant are similar to the preset interval, and are not described herein again. Of course, in the implementation process, other implementation means can be adopted to determine whether the temperature sensor and the inner container are in cold-hot state balance.
S103, after the cold state and the hot state are balanced, controlling the cooking appliance to perform dry burning detection, and stopping heating the cooking appliance in the dry burning state or heating the cooking appliance by adopting reduced heating power.
When the temperature difference between the pot body and the inner container is large, the temperature detected by the temperature sensor reflects the cold-hot state unbalance between the temperature sensor and the inner container, the detection result obtained by dry combustion detection at the moment is more or less influenced, and a large judgment error is easily generated, so that the dry combustion detection process is started after the cold-hot state balance in the embodiment of the application. The specific implementation manner of the dry burning detection process will be presented below, and will not be described herein.
In the embodiment of the present application, the cooking appliance in the dry-fire state refers to a cooking appliance to be dried-fire, or a cooking appliance having a tendency to be dried-fire. That is, in the embodiment of the present application, the cooking appliance in the dry-fire state may be a cooking appliance that has not been dried-fire, and of course, may also be a cooking appliance that has been dried-fire. Therefore, the dry-cooking protection method provided by the embodiment of the application can be used for protecting the cooking appliance to be dried, namely, dry-cooking prevention measures, and can also be used for protecting the cooking appliance which is dried, namely, eliminating the potential safety hazard of the dried cooking appliance, and shortening the dry-cooking duration of the cooking appliance as much as possible so as to ensure the safety of using the cooking appliance by a user.
Compared with the situation that the temperature measuring sensor detects inaccurate temperature and the electric pressure cooker burns dry in the prior art, in the embodiment of the application, whether the temperature measuring sensor and the inner container are balanced in a cold and hot state or not is determined by combining the acquired first temperature change value, and the cooking appliance is controlled to burn dry in the situation that the temperature measuring sensor and the inner container are balanced in the cold and hot state, so that the cooking appliance in the dry burning state is heated by stopping heating or adopting reduced heating power, and the dry burning protection of the cooking appliance is realized.
The first temperature change value reflects the temperature change degree of the bottom of the cooking appliance in a period of time, and the temperature change degree can often reflect whether the overall cold and hot states of the cooking appliance are balanced. For the cooking utensil with balanced cold and hot states, the accuracy of the temperature detected by the subsequent temperature measuring sensor is higher, so that the inaccurate temperature detected by the temperature measuring sensor can be effectively avoided. Under the relatively accurate temperature measurement condition, the cooking utensil can realize corresponding dry combustion method and detect according to the temperature that detects to realize dry combustion method protection under the condition that needs take dry combustion method protection.
In addition, the dry combustion detection process may be an implementation manner different from the conventional temperature value comparison in the prior art, in the embodiment of the present application, the dry combustion detection process has a more complete detection system, and the specific implementation manner may refer to the following, which is not described herein again.
In the prior art, after the electric pressure cooker stops heating, the temperature of the electric pressure cooker still continues to rise within a subsequent period of time, and the rising trend of the bottom temperature of the electric pressure cooker is higher than that of the normal heating process due to the dry burning of the electric pressure cooker, so that the overall temperature of the electric pressure cooker rises to a higher temperature within a short time. Thus, the components of the electric pressure cooker are likely to be deformed and damaged, and the service life of the electric pressure cooker is reduced. In addition, when the parts of the electric pressure cooker are seriously deformed and damaged, other safety problems such as air leakage and the like can be further caused, and the user experience is influenced. In order to solve the above problem, in an implementation manner of the embodiment of the present application, a manner of implementing dry burning detection by a variation degree of a temperature of a bottom of a cooking appliance during a heating process is provided. As shown in fig. 2, the process of detecting the dry burning of the cooking appliance may include S201 and S202.
And S201, acquiring a second temperature change value of the bottom of the cooking utensil in a second preset time period.
The starting time of the second preset time period may be the ending time of the first preset time period. Therefore, in the process of acquiring the temperature by the temperature measuring sensor, in order to obtain the first temperature change value and the second temperature change value, two temperature change values, namely the first temperature change value and the second temperature change value, can be finally obtained only by acquiring the temperature at three moments. And because when the second temperature variation value is obtained, the temperature sensor and the inner container are in cold-hot state balance, the temperature acquired at the cut-off time of the first preset time period can not have excessive influence on the accuracy of the second temperature variation value.
In this embodiment, the value of the second preset time period may be matched with at least one of a basic parameter of the cooking appliance, a called cooking function, and an environmental parameter. The basic parameters refer to parameters such as specifications of the cooking appliances, for example, working powers of different types of cooking appliances may be different, and therefore, second preset time periods corresponding to different types of cooking appliances may be different; the environmental parameters refer to parameters such as environmental temperature and humidity, and considering the influence of the environment on the operation of the cooking appliance, the environmental parameters may also be influence parameters set in the second preset time period, for example, the second preset time period corresponding to the same cooking appliance applied to two geographical locations with large latitude and longitude differences may be different. It should be noted that the setting manner, specific value, and the like of the parameters, such as the duration of the second preset time period, the start time and the stop time of the second preset time period, are not limited herein.
S202, according to the magnitude relation between the second temperature change value and the first threshold value, determining that the cooking appliance with the second temperature change value larger than or equal to the first threshold value is in a dry-burning state.
The first threshold may be preset before the cooking appliance leaves a factory, and may be specifically determined according to one or more of parameters such as a historical experience value, a delay of the temperature measurement sensor, and a measurement accuracy of the temperature measurement sensor. The subsequent user can adjust the preset interval according to one or more of the parameters such as the specific requirement of dry burning protection, the loss degree of the cooking utensil and the like. In the embodiment of the present application, the setting manner, the adjustment manner, the specific value, and the like of the first threshold are not limited.
The bottom temperature of a cooking utensil in normal heating is usually changed linearly or close to linear, i.e. the bottom temperature is usually proportional to time. Generally, under the same cooking condition of cooking appliances with the same specification, the temperature change trend of the cooking appliances with dry burning is greatly changed within a period of time, namely, the bottom temperature is sharply increased, and the conventional linear change rule is broken away. Therefore, in the embodiment of the present application, whether the cooking appliance is in the dry-fire state can be directly determined according to the magnitude of the change in the bottom temperature.
In an implementation manner of the embodiment of the present application, there is a certain correlation between the obtaining timing of the second temperature variation value and the obtaining timing of the first temperature variation value, that is, the temperature value of the bottom of the cooking appliance at the ending time of the first preset time period may be used as a parameter for calculating the first temperature variation value, and may also be used as a parameter for calculating the second temperature variation value. Therefore, on the basis of the implementation shown in fig. 2, the implementation shown in fig. 3 can also be realized. Wherein, S201 obtains the second temperature variation value of the bottom of the cooking appliance in the second preset time period, which can be implemented as S2011 and S2012.
And S2011, controlling the cooking appliance to stop heating at the ending time of the second preset time period, and acquiring a third temperature value of the bottom of the cooking appliance.
It should be noted that, in consideration of the fact that the cooking appliance in the dry-fire state is usually in the temperature-rising state after the heating is stopped, in the embodiment of the present application, in order to avoid the potential safety hazard caused by the temperature continuing to rise greatly in the detection process, the cooking process may be temporarily interrupted by stopping heating the cooking appliance, and the third temperature is obtained. In addition, in the actual temperature detection process, for the matter with larger specific heat capacity contained in the inner container, along with the continuation of heating, the matter can absorb partial heat of the inner container in the heating process, so that the temperature of the inner container is reduced, and the accuracy of temperature detection is influenced. Therefore, the third temperature is detected after the cooking utensil stops heating, and the accuracy of temperature detection can be improved to some extent.
S2012, determining the difference between the third temperature value and the second temperature value as a second temperature change value.
And the second temperature value is the temperature value of the bottom of the cooking utensil at the ending moment of the first preset time period.
The dry-fire protection scheme provided by the embodiments of the present application is further described below with reference to specific examples. Fig. 4 is a flow chart illustrating an exemplary dry-fire protection scheme provided in an embodiment of the present application. The dry-fire protection process may include S301 to S309.
S301, recording the bottom temperature Bot of the electric pressure cooker0And starting a timer T0。
S302, when the timer T0When the time reaches a certain time, recording the current bottom temperature Bot1。
S303, judging | Bot1-Bot0Whether | is greater than or equal to 3 degrees. If yes, go to S304; otherwise, S305 and subsequent steps are performed.
Note that the range of the interval of 0 to 3 degrees (excluding 3 degrees), i.e., the preset interval, is defined. In the embodiment of the present application, the lower limit of the preset interval is 0 and the upper limit is 3, and the values of the upper limit and the lower limit of the preset interval are not limited to the embodiment of the present application, and are only used as an exemplary implementation manner.
S304, determining that the electric pressure cooker is in an unstable state at the moment, and waiting for the electric pressure cooker to be stable. And then S301 is performed again.
The stable state refers to a state in which the temperature sensor and the liner are in a cold-hot state balance, and the specific contents can be expressed by referring to the foregoing description, which is not repeated herein.
S305, starting heating and starting a timer T1。
S306, as a timer T1When the time reaches a certain time, the heating is stopped, and the current bottom temperature Bot is recorded2。
S307, judging Bot2-Bot1Whether it is greater than or equal to the set difference. If yes, go to S308; otherwise, S309 is executed.
The set difference may be the first threshold, and reference may be specifically made to the related description of the first threshold, which is not repeated herein.
And S308, determining that the electric pressure cooker is in a dry burning state, and keeping heating stopped.
For the electric pressure cooker in the dry-burning state, the continuity of the dry-burning state can be relieved by adopting a mode of reducing heating power. Of course, for an electric pressure cooker that has been dry-fired, the most reliable and efficient way to achieve this is to stop the heating.
S309, determining that the electric pressure cooker is not in a dry-burning state, and continuing heating.
In the embodiment of the present application, the timer T0And a timer T1This can be done by using a timer, for example, in a time division multiplexing manner. Wherein, the timer T0And a timer T1The recording time may be the same or different, and the corresponding time is not limited herein, and may be preset by combining historical experience values.
Considering that the cooking appliance may cause dry-burning of the cooking appliance due to too little water during the cooking process, in one implementation manner of the embodiment of the present application, during the dry-burning detection, low-water detection may be performed on the cooking appliance. Therefore, on the basis of the implementation shown in fig. 1, the implementation shown in fig. 5 can also be realized. After the first temperature variation value of the bottom of the cooking appliance is obtained within the first preset time period at the start time of executing the cooking in S101, if the first temperature variation value is within the preset interval, S104 may also be executed.
And S104, controlling the cooking appliance to detect the low water quantity, and stopping heating the cooking appliance in the low water quantity state or heating the cooking appliance by adopting the reduced heating power.
Wherein, the temperature variation value of the bottom of the cooking utensil in the low water state is in positive correlation with the time.
In order to improve the taste of food, the cooking utensil can be controlled to continuously exhaust and boil in the process of exhausting and boiling, so that the water in the inner container of the cooking utensil is reduced and even completely removed, and the hidden danger of dry burning exists. Therefore, in order to further reduce the safety problem of the cooking appliance caused by dry burning, in one implementation manner of the embodiment of the present application, certain measures need to be taken for the cooking appliance in a low water state.
It should be noted that there may be no chronological order between the dry-fire detection and the low-water detection, that is, for the cooking appliance, the two detection processes may be executed in parallel or in a certain order.
As shown in fig. 6, the process of the cooking appliance performing low water detection may include S401 and S402, or S401 and S403.
S401, acquiring a third temperature change value of the bottom of the cooking utensil in a third preset time period.
It should be noted that the setting manner, specific value, and the like of the parameters, such as the duration of the second preset time period, the start time and the stop time of the second preset time period, are not limited herein.
S402, if the third temperature change value is larger than or equal to the second threshold, updating the third preset time period to a next time period adjacent to the third preset time period, obtaining the third temperature change value at the bottom of the cooking appliance again, comparing the third temperature change value with the second threshold until the continuous occurrence frequency of the third temperature change value larger than or equal to the second threshold reaches the preset frequency, and determining that the cooking appliance is in a low water level state.
In the embodiment of the present application, the second threshold may be the same as or different from the first threshold, i.e. the same or different thresholds may be selected for different detection processes. In addition, in the practical application process, for the low water detection process performed in different time periods, the same or different thresholds may be selected for measurement, that is, the second thresholds in different time periods may be the same or different. It should be noted that, the setting manner of the second threshold is similar to that of the first threshold, and reference may be made to the related expression of the first threshold, which is not described herein again.
In addition, the setting manner, value, and the like of the preset times are similar to the first threshold and the second threshold, and the description of the first threshold and the second threshold may be specifically referred to, which is not repeated herein.
And S403, if the third temperature change value is smaller than the second threshold value, ending the low water quantity detection of the cooking utensil at this time.
The dry-fire protection scheme provided by the embodiments of the present application is further described below with reference to specific examples. Fig. 7 is a flow chart illustrating an exemplary low water protection scheme provided in an embodiment of the present application. The low water protection process may include S501 to S508.
S501, initializing the number of exceptions, Cnt being 0.
S502, recording the bottom temperature Bot of the electric pressure cooker3Start timer T2。
S503, when the timer T2When the time reaches a certain time, recording the current bottom temperature Bot4。
S504, judging Bot4-Bot3Whether greater than or equal to 3 degrees. If yes, go to step S506 and the following steps; otherwise, S505 is executed.
The 3 degrees is only an exemplary value of the second threshold, and is not limited to the embodiment of the present application, and for the value of the second threshold, for example, the foregoing related expression of the second threshold may be specifically referred to, and details are not repeated herein.
S505 clears the abnormality count to Cnt 0. After S505 is executed, S502 is executed.
S506, adding 1 to the abnormal times, namely Cnt + 1.
And S507, judging whether the abnormal frequency is more than or equal to 4. If yes, go to S508; otherwise, S502 is executed.
Wherein 4 is only an exemplary value of the preset number, and is not limited to the embodiment of the present application, and for the value of the preset number, reference may be specifically made to the foregoing related expression of the preset number, and details are not repeated herein.
And S508, determining that the current electric pressure cooker is in a low water volume state, and stopping heating.
It should be noted that the low water amount protection process includes a determination process implemented based on the superposition of abnormal times, and also includes a low water amount protection process adopted by the electric pressure cooker in the low water amount state. In the embodiment of the application, the electric pressure cooker is determined to be in the low water volume state only under the condition of continuous abnormality for many times, and the misjudgment in the detection process is ignored in the mode of clearing the abnormality times only temporarily, so that the accuracy of the low water volume detection process is ensured.
Referring to the low water protection process, it can be known that the temperature difference before and after the comparison is performed at intervals in the embodiment of the present application. And when the temperature difference is large, judging the abnormal condition, and accumulating on the basis of the original abnormal times. When the abnormal times reach a certain value, the electric pressure cooker can be judged to be abnormal, namely, in a low water content state, and the corresponding protection effect can be achieved by stopping heating or reducing heating power.
The embodiment of the application provides a cooking appliance. The cooking utensil comprises a pot body, a pot cover and an inner container, the inner container is placed in the pot body, and a temperature measuring sensor and a heating device are arranged at the bottom of the pot body. As shown in fig. 8, the cooking appliance 60 may further include:
the obtaining module 61 is configured to obtain a first temperature change value of the bottom of the cooking appliance in a first preset time period at a cooking start time after the inner container is placed in the pot body.
And the processing module 62 is configured to determine that the temperature sensor and the liner are in cold-hot state balance if the first temperature change value acquired by the acquiring module 61 is within the preset interval.
And the control module 63 is configured to control the cooking appliance to perform dry-fire detection after the processing module 62 determines that the cold state and the hot state are balanced, and stop heating the cooking appliance in the dry-fire state or perform heating with reduced heating power.
In one implementation, the control module 63 is further configured to obtain a second temperature variation value of the bottom of the cooking appliance in a second preset time period, where a starting time of the second preset time period is an ending time of the first preset time period.
The processing module 62 is further configured to determine that the cooking appliance with the second temperature variation value being greater than or equal to the first threshold is in the dry-fire state according to the magnitude relationship between the second temperature variation value and the first threshold.
In one implementation, the first temperature variation value is an absolute value of a difference between a first temperature value and a second temperature value, the first temperature value is a temperature value of the bottom of the cooking appliance at a start time of a first preset time period, and the second temperature value is a temperature value of the bottom of the cooking appliance at an end time of the first preset time period.
In one implementation, the control module 63 is further configured to control the cooking appliance to stop heating at the ending time of the second preset time period, and acquire a third temperature value of the bottom of the cooking appliance through the acquisition module 61.
The processing module 62 is further configured to determine a difference between the third temperature value and the second temperature value as a second temperature change value, where the second temperature value is a temperature value of the bottom of the cooking appliance at a stop time of the first preset time period.
In one implementation, the value of the second preset time period is matched with at least one of a basic parameter of the cooking appliance, a called cooking function and an environmental parameter.
In one implementation, the control module 63 is further configured to control the cooking appliance to perform low water detection if the first temperature variation value is within a preset interval, and stop heating the cooking appliance in a low water state or perform heating with reduced heating power.
In one implementation, the temperature change value of the bottom of the cooking appliance in the low water state is positively correlated with the time.
In one implementation, the obtaining module 61 is further configured to obtain a third temperature variation value of the bottom of the cooking appliance in a third preset time period.
The processing module 62 is further configured to update the third preset time period to a next time period adjacent to the third preset time period if the third temperature change value is greater than or equal to the second threshold, and compare the third temperature change value at the bottom of the cooking appliance with the second threshold again through the obtaining module 61 until the number of times that the third temperature change value is greater than or equal to the second threshold appears continuously reaches a preset number of times, so as to determine that the cooking appliance is in a low water level state; if the third temperature variation value is smaller than the second threshold, the control module 63 ends the low water level detection of the cooking appliance this time.
In one implementation, the cooking appliance 60 may further include one or more of a storage module 64, a display module 65, and a communication module 66. The storage module 64 may be configured to store contents required by the modules to implement corresponding functions; a display module 65, which may be used to display parameters of the cooking appliance 60, such as the cooking function performed, the remaining cooking time, etc., for indicating the cooking condition, and/or other contents; the communication module 66 may be used to implement data interaction between the above modules and/or support data interaction between the cooking appliance 60 and a device such as a mobile phone. In the embodiment of the present application, the content, format, and the like stored in the storage module are not limited.
In the embodiment of the present application, the obtaining module 61 and the communication module 66 may be implemented as a communication interface, the processing module 62 and the control module 63 may be implemented as a processor and/or a controller, the storage module 64 may be implemented as a memory, and the display module 65 may be implemented as a display.
Fig. 9 is a schematic structural diagram of another cooking appliance according to an embodiment of the present application. The cooking appliance 70 may include a communication interface 71 and a processor 72. In one implementation of the embodiment of the present application, the cooking appliance 70 may further include a memory 73 and a display 74. The communication interface 71, the processor 72, the memory 73, and the display 74 may communicate with each other through a bus 75. The functions implemented by the above components may refer to the description of the functions of the modules, which is not repeated herein.
It should be noted that, referring to fig. 8 and 9, the cooking appliance provided in the embodiments of the present application may include more or less modules and components than those shown in the drawings, which is not limited herein.
The present application provides a cooking appliance comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of any one of the above-mentioned various possible implementations when executing the computer program.
The present application provides a computer-readable storage medium. The storage medium stores a computer program which, when executed by a processor, implements the method of any of the various possible implementations described above.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the entity and system embodiments, since they are substantially similar to the method embodiments, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiments.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A dry-burning protection method for a cooking appliance is characterized in that the cooking appliance comprises a pot body, a pot cover and an inner container, the inner container is placed in the pot body, a temperature measuring sensor and a heating device are arranged at the bottom of the pot body, and after the inner container is placed in the pot body, the following steps are executed:
acquiring a first temperature change value of the bottom of the cooking appliance in a first preset time period at the starting moment of cooking;
if the first temperature change value is within a preset interval, judging that the temperature sensor and the inner container are in cold-hot state balance;
and after the cold state and the hot state are balanced, controlling the cooking appliance to perform dry burning detection, and stopping heating the cooking appliance in the dry burning state or heating the cooking appliance by adopting reduced heating power.
2. The method of claim 1, wherein the cooking appliance performs a dry fire detection process comprising:
acquiring a second temperature change value of the bottom of the cooking appliance in a second preset time period, wherein the starting time of the second preset time period is the ending time of the first preset time period;
and determining that the cooking appliance with the second temperature change value larger than or equal to the first threshold value is in a dry-burning state according to the magnitude relation between the second temperature change value and the first threshold value.
3. The method according to claim 2, wherein the first temperature variation value is an absolute value of a difference between a first temperature value and a second temperature value, the first temperature value is a temperature value of the bottom of the cooking appliance at a start time of the first preset time period, and the second temperature value is a temperature value of the bottom of the cooking appliance at an end time of the first preset time period.
4. The method according to claim 3, wherein the obtaining a second temperature variation value of the bottom of the cooking appliance in a second preset time period comprises:
controlling the cooking appliance to stop heating at the ending time of the second preset time period, and acquiring a third temperature value of the bottom of the cooking appliance;
and determining a difference value between the third temperature value and a second temperature value as the second temperature change value, wherein the second temperature value is the temperature value of the bottom of the cooking utensil at the end time of the first preset time period.
5. The method of claim 2, wherein the value of the second preset time period matches at least one of a base parameter of the cooking appliance, an invoked cooking function, and an environmental parameter.
6. The method of claim 1, wherein if the first temperature variation value is within a predetermined interval, the method further comprises:
and controlling the cooking appliance to detect the low water quantity, and stopping heating the cooking appliance in the low water quantity state or heating the cooking appliance by adopting the reduced heating power.
7. The method of claim 6, wherein the temperature variation of the bottom of the cooking appliance in the low water state is positively correlated to time.
8. The method of claim 6, wherein the cooking appliance performs a low water detection process comprising:
acquiring a third temperature change value of the bottom of the cooking appliance in a third preset time period;
if the third temperature change value is greater than or equal to a second threshold value, updating the third preset time period to a next time period adjacent to the third preset time period, obtaining the third temperature change value at the bottom of the cooking appliance again, comparing the third temperature change value with the second threshold value until the number of times that the third temperature change value is greater than or equal to the second threshold value continuously appears reaches a preset number of times, and determining that the cooking appliance is in the low water level state;
and if the third temperature change value is smaller than the second threshold value, ending the low water quantity detection of the cooking appliance at this time.
9. A cooking appliance comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of any one of claims 1 to 8 when executing the computer program.
10. A computer-readable storage medium, characterized in that the storage medium stores a computer program which, when executed by a processor, implements the method of any of the preceding claims 1 to 8.
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| CN113133665B (en) * | 2020-01-17 | 2022-10-04 | 九阳股份有限公司 | Dry burning prevention detection method for cooking utensil and cooking utensil |
| CN113133636B (en) * | 2020-01-17 | 2022-12-06 | 九阳股份有限公司 | Dry burning prevention detection method for cooking appliance and cooking appliance |
| CN113390106B (en) * | 2020-03-12 | 2024-04-05 | 广东美的白色家电技术创新中心有限公司 | Control method, cooking appliance and storage medium |
| CN113747620B (en) * | 2020-05-29 | 2024-05-31 | 佛山市顺德区美的电热电器制造有限公司 | Control circuit and control method of cooking appliance, cooking appliance and storage medium |
| CN113729472A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method of cooking appliance, cooking appliance and computer readable storage medium |
| CN112631351A (en) * | 2020-11-26 | 2021-04-09 | 中山市雅乐思电器制造有限公司 | Dry burning prevention control method for liquid heater |
| CN115727356A (en) * | 2021-09-01 | 2023-03-03 | 佛山市顺德区美的洗涤电器制造有限公司 | Operation control method and device for kitchen range and computer readable storage medium |
| CN113729508B (en) * | 2021-09-01 | 2022-11-01 | 珠海格力电器股份有限公司 | Cooking equipment control method and device, computer equipment and storage medium |
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