CN109237544B

CN109237544B - Dry burning prevention control method and dry burning prevention system

Info

Publication number: CN109237544B
Application number: CN201811028212.5A
Authority: CN
Inventors: 韩杰; 李孟彬; 季俊生
Original assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Priority date: 2018-09-04
Filing date: 2018-09-04
Publication date: 2021-03-19
Anticipated expiration: 2038-09-04
Also published as: CN109237544A

Abstract

The invention discloses an anti-dry heating control method and an anti-dry heating system. The control method for preventing dry burning comprises the following steps: collecting the temperature of the pot; determining whether the cooker is in a water cooking state or not according to the temperature of the cooker; when the cooking range is determined to be in a water cooking state, timing is started; when the timing duration is greater than the alarm time threshold of the stove and the temperature of the pot is not greater than the dry-burning prevention temperature threshold of the stove, controlling the stove to send alarm information; and when the temperature of the cooker is higher than the dry-burning prevention temperature threshold value of the cooker, controlling the cooker to be closed. In the control method for preventing dry burning, the timing is started when the cooking state of the stove is determined to be the water cooking state, and thus the stove is controlled to send out alarm information in a timing mode, so that the stove can inform a user of paying attention to the cooking condition of the stove before or just before the dry burning occurs, the control precision of the dry burning prevention function of the stove can be improved, and the dry burning prevention misjudgment can be prevented.

Description

Dry burning prevention control method and dry burning prevention system

Technical Field

The invention relates to the technical field of cooking appliances, in particular to an anti-dry heating control method and an anti-dry heating system.

Background

In the related art, the dry burning prevention function provided in the household cooker can automatically close the cooker when the temperature of the cooker reaches the dry burning prevention temperature threshold. Because the time for the cookware to reach the dry burning prevention state under different cooking states and firepower is different, the existing dry burning prevention control method uses the same dry burning prevention temperature threshold, and the dry burning occurrence is judged when the temperature of the cookware is higher than the dry burning prevention temperature threshold. Thus, dry burning prevention misjudgment is easy to occur. Meanwhile, before the stove is dry-burned or when the stove just starts dry-burning, the user cannot be informed to close the stove in time, when the temperature of the pot reaches the dry-burning prevention temperature threshold, the pot may be dry-burned for a certain time, so that the food in the pot is easily carbonized, the pot is difficult to clean, and the user experience is poor. Therefore, how to set a proper alarm time point and a dry burning prevention temperature value becomes a problem to be solved urgently.

Disclosure of Invention

The embodiment of the invention provides an anti-dry heating control method and an anti-dry heating system.

The dry burning prevention control method is used for the kitchen range. The control method for preventing dry burning comprises the following steps:

collecting the temperature of the pot;

determining whether the cooker is in a water cooking state or not according to the temperature of the cooker;

starting timing when the cooker is determined to be in the water cooking state;

when the timed duration is greater than the alarm time threshold of the cooker and the temperature of the cookware is not greater than the dry-burning prevention temperature threshold of the cooker, controlling the cooker to send out alarm information;

when the temperature of the cooker is higher than the dry-burning prevention temperature threshold value of the cooker, the cooker is controlled to be closed.

In the control method for preventing dry burning, timing is started when the cooking state of the stove is determined to be a water cooking state, and the stove is controlled to send alarm information in a timing mode, so that the stove informs a user of the cooking condition of the stove before or immediately before dry burning occurs, the control precision of the dry burning prevention function of the stove can be improved, and the dry burning prevention misjudgment is prevented.

In certain embodiments, the control method comprises:

gather the current firepower of cooking utensils, and according to the current firepower of cooking utensils acquires corresponding first anti-dry heating temperature value and first alarm time value, and will first anti-dry heating temperature value set up to the anti-dry heating temperature threshold value of cooking utensils and with first alarm time value set up to the alarm time threshold value of cooking utensils, the firepower of cooking utensils with the anti-dry heating temperature threshold value of cooking utensils is positive correlation, the firepower of cooking utensils with the alarm time threshold value negative correlation of cooking utensils.

In some embodiments, determining whether the cooktop is in a water cooking state according to the temperature of the cookware includes:

judging whether the boiling section exists in the pot according to the temperature of the pot,

if so, determining that the stove is in the water cooking state;

if not, determining that the stove is in a waterless cooking state.

In some embodiments, determining whether a boiling section is present based on the temperature of the pot comprises:

judging whether the collected quantity of the temperatures of the cookware is larger than a preset quantity or not;

if so, calculating the change rate of the temperature of the pot within a preset time, and when the change rate of the temperature is smaller than or equal to a preset value, determining that the boiling section of the pot exists and taking the current temperature of the pot as the pot boiling temperature of the pot;

and when the change rate of the temperature is greater than the preset value, determining that the boiling section does not exist in the pot.

In some embodiments, the rate of change of the temperature of the pot over the preset time period comprises at least one of:

the sum of absolute values of differences between the temperatures of the pots in the preset duration and the average value of the temperatures of the pots in the preset duration;

the slope of the temperature of the cookware to the time within the preset time length;

the variance of the temperature of the cookware within the preset time length;

and the standard deviation of the temperature of the cookware within the preset time length.

In certain embodiments, the control method comprises: work as the cooking utensils are in when having water culinary art state, according to the temperature of pan acquires the heat conductivity of pan, gather the current firepower of cooking utensils and according to the current firepower of cooking utensils with the heat conductivity of pan acquires the correspondence alarm time threshold with the dry combustion preventing temperature threshold of cooking utensils.

In some embodiments, obtaining the corresponding alarm time threshold and the dry-burning prevention temperature threshold of the cooker according to the current firepower of the cooker and the thermal conductivity of the pot includes:

judging whether the boiling temperature of the pot is less than or equal to the preset heat conduction temperature,

if yes, obtaining a second dry burning prevention temperature value and a second alarm time value according to the current firepower of the cooker and the heat conductivity of the cooker, setting the second dry burning prevention temperature value as a dry burning prevention temperature threshold value of the cooker and setting the second alarm time value as an alarm time threshold value of the cooker.

If not, acquiring a third dry burning prevention temperature value and a third alarm time value according to the current firepower of the cooker and the heat conductivity of the cooker, and setting the third dry burning prevention temperature value as an anti-dry burning prevention temperature threshold value of the cooker and setting the third alarm time value as an alarm time threshold value of the cooker;

the third dry burning prevention temperature value is greater than the second dry burning prevention temperature value, and the third alarm time value is greater than the second alarm time value.

In certain embodiments, the control method comprises:

and when the cooker is determined to be in a waterless cooking state and the temperature of the cooker is higher than the dry burning prevention threshold value of the cooker, controlling the cooker to be closed.

In some embodiments, the alarm time threshold includes a plurality of different alarm time thresholds, the plurality of alarm time thresholds define a plurality of alarm ranges, the alarm information includes a plurality of alarm information, each of the alarm ranges corresponds to one of the alarm information, and the controlling of the cooker to send out the alarm information includes:

and controlling the kitchen range to send out the alarm information corresponding to the alarm range according to the alarm range where the timed duration is located.

In certain embodiments, the control method comprises:

receiving an alarm termination instruction;

and controlling the kitchen range to stop sending the alarm information according to the alarm termination instruction.

The embodiment of the invention also provides an anti-dry burning system, which comprises a control device and a stove, wherein the control device is connected with the stove and is used for the steps of the control method of any one of the above embodiments.

In the dry burning prevention system, the timing is started when the cooking state of the stove is determined to be the water cooking state, and the stove is controlled to send alarm information in a timing mode, so that the stove can inform a user of paying attention to the cooking condition of the stove before or immediately before dry burning occurs, the control precision of the dry burning prevention function of the stove can be improved, and the dry burning prevention misjudgment can be prevented.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a flowchart of a dry-fire prevention control method according to an embodiment of the present invention.

Fig. 2 is a scene schematic diagram of the dry burning prevention system according to the embodiment of the present invention.

Fig. 3 is a schematic block diagram of an anti-dry heating system according to an embodiment of the present invention.

Fig. 4 is another flowchart of the dry burning prevention control method according to the embodiment of the present invention.

Fig. 5 is a graph of the temperature of the pot over time with the pot in a water cooking state.

Fig. 6 is a graph of the temperature of the pot over time when the pot is in a no water cooking state.

Fig. 7 is still another flowchart of the dry-fire prevention control method according to the embodiment of the present invention.

Fig. 8 is still another flowchart of the dry burning prevention control method according to the embodiment of the present invention.

Fig. 9 is still another flowchart of the dry burning prevention control method according to the embodiment of the present invention.

Fig. 10 is still another flowchart of the dry burning prevention control method according to the embodiment of the present invention.

Fig. 11 is still another flowchart of the dry burning prevention control method according to the embodiment of the present invention.

Fig. 12 is still another flowchart of the dry burning prevention control method according to the embodiment of the present invention.

Fig. 13 is still another flowchart of the dry burning prevention control method according to the embodiment of the present invention.

Fig. 14 is still another flowchart of the dry burning prevention control method according to the embodiment of the present invention.

Description of the main element symbols:

the dry-heating prevention system 100, the cooker 20, the pot 30, the temperature sensor 40, the control device 50 and the fire power detection sensor 60.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, embodiments of the invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1 to 3, a dry-burning prevention control method according to an embodiment of the present invention is applied to a cooker 20. The control method for preventing dry burning comprises the following steps:

step S10, collecting the temperature of the pot 30;

step S20, determining whether the cooking utensil 20 is in a water cooking state according to the temperature of the pot 30;

step S30, when the cooking range 20 is determined to be in a water cooking state, timing is started;

step S32, judging whether the timing duration is greater than the alarm time threshold of the cooker 20;

step S40, when the timing duration is longer than the alarm time threshold of the kitchen range 20 and the temperature of the pot 30 is not longer than the dry-burning prevention temperature threshold of the kitchen range 20, controlling the kitchen range 20 to send out alarm information;

step S50, judging whether the temperature of the pot 30 is larger than the dry-burning prevention temperature threshold value of the stove 20;

and step S52, when the temperature of the pot 30 is higher than the dry-burning prevention temperature threshold of the cooker 20, controlling the cooker 20 to be closed.

The dry burning prevention system 100 of the embodiment of the invention comprises a cooker 20 and a control device 50, wherein the control device 50 is connected with the cooker 20. As an example, the dry burning prevention control method according to the embodiment of the present invention may be implemented by the dry burning prevention system 100 according to the embodiment of the present invention, and is applied to the cooker 20.

Step S10, step S20, step S30, step S32, step S40, step S42, step S50, step S60, and step S62 of the dry burning prevention control method according to the embodiment of the present invention may be implemented by control device 50. That is, the control device 50 is used for collecting the temperature of the pot 30; determining whether the cooker 20 is in a water cooking state according to the temperature of the cooker 30; when the cooking range 20 is determined to be in a water cooking state, timing is started; judging whether the timed duration is greater than the alarm time threshold of the cooker 20, and controlling the cooker 20 to send alarm information when the timed duration is greater than the alarm time threshold of the cooker 20 and the temperature of the cooker 30 is not greater than the dry burning prevention temperature threshold of the cooker 20; judging whether the temperature of the cooker 30 is greater than the dry burning prevention temperature threshold of the cooker 20; and when the temperature of the cooker 30 is higher than the dry-burning prevention temperature threshold of the cooker 20, controlling the cooker 20 to be closed.

In the dry burning prevention control method of the embodiment of the invention, the timing is started when the cooking state of the stove 20 is determined to be the water cooking state, and thus, the stove 20 is controlled to send out alarm information in a timing mode, so that the stove 20 informs a user of paying attention to the cooking condition of the stove 20 before or immediately before dry burning occurs, the control precision of the dry burning prevention function of the stove 20 can be improved, and the occurrence of false judgment of dry burning prevention can be prevented.

Referring to fig. 3, the temperature of the pot 30 can be measured by the temperature sensor 40. In one embodiment, the temperature sensor 40 may be disposed on the cooktop 20, for example, the temperature sensor 40 is a dry-fire protection temperature probe of the cooktop 20. The dry-fire prevention temperature probe may be provided in a burner of the cooker 20. The collected temperature of the pot 30 can be understood as temperature data output by the temperature sensor 40 (such as an anti-dry heating temperature probe), and is not necessarily linked to whether the pot 30 is placed on the cooker 20. When the pot 30 is placed on the cooker 20, the pot 30 is elastically abutted against the dry-burning prevention temperature probe, so that the dry-burning prevention temperature probe obtains more accurate temperature of the pot 30.

In another embodiment, the temperature of the pot 30 is detected by a temperature sensor 40 provided at the pot 30. The temperature sensor 40 may be a wireless passive temperature sensor. The wireless passive temperature sensor does not need power supply, and can send out the collected temperature data in a wireless mode.

In another embodiment, the temperature sensor 40 may be another temperature sensor, the temperature sensor may be disposed in an interlayer at the bottom of the pot body of the pot 30, and the temperature of the pot 30 collected by the temperature sensor may be transmitted to the control device 50 through a temperature signal transmitting unit disposed at the handle of the pot 30.

Referring to fig. 4, in some embodiments, step S20 includes:

step S22, judging whether the pot 30 has boiling section according to the temperature of the pot 30,

if yes, step S24, determining that the cooking range 20 is in a water cooking state;

if not, step S26, determining that the cooking range 20 is in the water-free cooking state.

The control method described above can be implemented by the dry combustion preventing system 100 according to the embodiment of the present invention. The steps S22, S24, and S26 of the dry burning prevention control method according to the embodiment of the present invention may be implemented by the control device 50. That is, the control device 50 is configured to determine whether the pot 30 has a boiling section according to the temperature of the pot 30, and if so, determine that the cooker 20 is in the water cooking state; if not, determining that the cooker 20 is in the waterless cooking state.

In particular, the boiling section of the pot 30 can be understood as the temperature section reached by the pot 30 when the pot 30 is in the boiling stage of the water cooking state. It should be noted that when the water in the pot 30 is boiling, the temperature of the water in the pot 30 is maintained at a stable temperature, and at this time, the temperature of the outer surface of the pot 30 is also maintained at a stable temperature when the heat is transferred to the outer surface of the pot 30. The fluctuation range of the temperature of the outer surface of the pot 30 within the predetermined range can also be understood as being in the boiling section.

Generally, the water cooking can be a water cooking mode with small change of temperature change rate of stewing, boiling, stewing and steaming. The waterless cooking comprises a waterless cooking mode with large change rate of temperature change of frying, stir-frying and frying. When the cooking utensil 20 is in a water cooking state, please refer to fig. 5, and the inventor finds that the temperature-time curves 1 and 2 of the pot 30 have a typical three-stage distribution characteristic, and the temperature-time curve 1 and the temperature-time curve 2 are temperature curves of the pot 30 with respect to temperature and time, respectively: a first stage: when the cooker 20 starts to heat, the temperature of the pot 30 gradually rises; and a second stage: when the water in the pot 30 is boiling, the temperature of the pot 30 is in a constant or approximately constant state, that is, the pot 30 has a boiling section; a third stage: when the water in the pot 30 is dried, the temperature of the pot 30 is increased again. Wherein, for the cookware 30 with good heat conductivity, such as the metal cookware 30, when the water in the pan is boiled, the temperature of the outer surface of the pan bottom is lower, such as 110 ℃ to 130 ℃, as shown in the temperature-time curve 1; for a pot 30 with poor thermal conductivity, such as a casserole, the temperature of the outer surface of the pot bottom is higher when the water in the pot is boiling. E.g., 140 c to 180 c, as shown in temperature time curve 2. When the cooking utensil 20 is in the water-free cooking state, the temperature-time curve 3 is a temperature curve of the temperature and the time of the pot 30 as shown in fig. 6, and the temperature curve 3 of the temperature and the time of the pot 30 has large fluctuation and no obvious rule, that is, in the water-free cooking state, the pot 30 generally has no boiling section.

Referring to fig. 7, in some embodiments, step S22 includes:

step S522, determining whether the collected temperature quantity of the cookware 30 is greater than a preset quantity;

if yes, step S524, calculating a change rate of the temperature of the pot 30 within a preset time period;

step S525, determining whether the change rate of the temperature of the pot 30 within the preset time is less than or equal to a preset value, if yes, step S526, determining that the pot 30 has a boiling section and taking the current temperature of the pot 30 as the pot boiling temperature of the pot 30; if not, step S528 determines that the pot 30 has no boiling section.

The control method of the present embodiment can be realized by the dry burning prevention system 100 of the present embodiment, wherein the control device 50 can realize steps S522, S524, S525, S526, and S528 of the dry burning prevention control method of the present embodiment. That is, the control device 50 is used to determine whether the collected temperature number of the cookware 30 is greater than a preset number; if so, calculating the change rate of the temperature of the pot 30 within the preset time; judging whether the change rate of the temperature of the pot 30 in the preset time is smaller than or equal to a preset value, if so, determining that the pot 30 has a boiling section and taking the current temperature of the pot 30 as the pot boiling temperature of the pot 30; if not, determining that the pot 30 does not have the pot boiling temperature.

The control method of the above embodiment determines whether the pot 30 has the boiling section by calculating the change rate of the temperature of the pot 30 within the preset time period, so that the cooking state of the cooker 20 can be accurately and quickly determined and the pot boiling temperature of the pot 30 can be obtained.

It should be noted that the rate of change of the temperature of the pot 30 within the preset time period in the present embodiment can be obtained by any one of the following embodiments.

The sum of absolute values of differences between the temperatures of the pots 30 in the preset time period and the average value of the temperatures of the pots 30 in the preset time period;

the slope of the temperature of the pot 30 versus time within a preset duration;

variance of temperature of the pot 30 within a preset time period;

the standard deviation of the temperature of the pot 30 within a preset time period.

Specifically, the change rate of the temperature of the pot 30 in the preset time period in the present embodiment may be obtained by the sum of the absolute values of the differences between the temperature of the pot 30 in the preset time period and the average value of the temperatures of the pot 30 in the preset time period. In one embodiment, the temperature T of the pot 30 is collected_kWhen the number is larger than the preset value N (namely k is larger than N), calculating T_k-NTo T_kN +1 in the intervalThe average value Tmean of the data of the temperatures of the individual pots 30, and the sum of the absolute values of the differences between the average value of the temperatures of the pots 30 and the individual temperatures Ti of the pots 30 within the preset time period can be represented as: SUB ═ Σ | Ti — Tmean | (i ═ k-N to k), and large SUB indicates large temperature change. When the SUB is less than or equal to the preset value, it indicates that the temperature change of the pot 30 is small, and it can be considered that the pot 30 is in a water cooking state such as stewing, boiling, stewing, steaming, etc. and the water is boiling, the cooker 20 is in a water cooking state, and the current temperature data T of the pot 30 at this time is used_kAs boiling temperature T of pot_b. It should be noted that when the current temperature T of the pot 30 is measured_kAs boiling temperature T of pot_bThat is, T_b＝T_kThereafter, if SUB is larger than the preset value, the pot 30 is also considered to be in the water cooking state.

It should be noted that the preset time length may be set to different values, and accordingly, according to an actual situation, the size of the preset value may also be correspondingly adjusted to a preset value corresponding to the time length of the preset time length, which is not limited herein. In one example, the preset time period may be 2 minutes, the temperature data of one pot 30 is collected every two seconds, the value of N may be 60, the preset value may be 10, and if k is 80, T is_k-NTo T_kThe data of the temperatures of N +1 pots 30 in the interval (b) can be understood as: t20 to T80 totaled 61 pot 30 temperature data within 2 minutes. It is to be understood that these specific values and the specific values recited in the following detailed description are merely exemplary in nature and are not to be construed as limiting the present invention. Since the temperature data of the pots 30 are acquired every other time period, when the temperature data of a certain number of pots 30 are acquired, there is a time period for acquiring the temperature data of the number of pots 30 accordingly. That is, the specific value of the preset time period can be associated with the required temperature amount of the pot 30.

Specifically, the change rate of the temperature of the pot 30 in the preset time period in the present embodiment can be realized by the slope of the temperature of the pot 30 in the preset time period with respect to time. In one embodiment, the temperature T of the pot 30 is collected_kLarge in quantityAt a predetermined value of N (i.e., k > N), T is a predetermined duration_k-NTo T_kWithin the interval of (2), obtain the linear fitting T_k-NTo T_kThe slope of the temperature of the pot 30 changing along with the time to the time is obtained by fitting, namely, y is ax + b, if a is smaller than or equal to the preset slope, the pot 30 is judged to be in a water cooking state such as stewing, boiling, stewing, steaming and the like, the water is boiled, the stove 20 is judged to be in the water cooking state, and the temperature data T at the moment is used_kAs boiling temperature T of pot_b. It should be noted that when the current temperature T of the pot 30 is measured_kAs boiling temperature T of pot_bThat is, T_b＝T_kThereafter, if a is greater than the predetermined slope, the pot 30 is considered to be in the water cooking state.

Specifically, the rate of change of the temperature of the pot 30 within the preset time period in the present embodiment may be realized by the variance of the temperature of the pot 30 within the preset time period. In one embodiment, the temperature data T is collected as_kWhen the number is larger than a preset value N (namely k is larger than N), T in the preset time length is calculated_k-NTo T_kThe Variance (VA) of the N +1 temperature data in the interval (b), wherein a large VA indicates a large temperature change of the pot 30. When VA is less than or equal to the preset value (the temperature change of the pot 30 is small), namely the pot 30 is in a cooking state with water such as stewing, boiling, stewing, steaming and the like, and the water is boiled, the temperature data T at the moment is obtained_kAs boiling temperature T of pot_b. It should be noted that when the current temperature T of the pot 30 is measured_kAs boiling temperature T of pot_bThat is, T_b＝T_kThereafter, if VA is greater than the predetermined value, the pot 30 is also considered to be in the water cooking state.

Specifically, the rate of change of the temperature of the pot 30 within the preset time period in the present embodiment may be realized by the standard deviation of the temperature of the pot 30 within the preset time period. In one embodiment, the temperature data T is collected as_kWhen the number is larger than a preset value N (namely k is larger than N), T in the preset time length is calculated_k-NTo T_kN +1 standard deviations (STD) of the temperature data in the interval(s), a large STD indicates a large temperature change of the pot 30. When the STD is less than or equal to the preset value (pot 3)0 temperature change is small), that is, the pot 30 is in a cooking state with water such as stewing, boiling, stewing, steaming, etc., and the water is boiling, the temperature data T at this time is_kAs boiling temperature T of pot_b. It should be noted that when the current temperature T of the pot 30 is measured_kAs boiling temperature T of pot_bThat is, T_b＝T_kThereafter, if the STD is greater than the preset value, the pot 30 is also considered to be in the water cooking state.

It should be noted that, when it is determined that the cooking utensil 20 is in the water cooking state, it indicates that the pot boiling temperature of the pot 30 is determined at this time, that is, the timing is started when the current temperature of the pot 30 is taken as the pot boiling temperature of the pot 30. When the timed duration is greater than the alarm time threshold of the cooker 20 and the temperature of the cooker 30 is not greater than the dry burning prevention temperature threshold of the cooker 20, the cooker 20 is controlled to send out alarm information.

When the timed duration is greater than the alarm time threshold of the cooker 20, it indicates that the state of the cooker 30 may be close to the dry-cooking state, and at this time, the cooker 20 is controlled to send out alarm information so as to timely inform the user of the cooking condition of the cooker 20. It should be noted that, no matter whether the timed duration is greater than the alarm time threshold, the cooking range 20 is controlled to be closed as long as the temperature of the pot 30 is greater than the dry-burning prevention temperature threshold of the cooking range 20.

In the embodiment of the present invention, the controlling of the cooking stove 20 to be turned off mainly means controlling the cooking stove 20 to stop heating, for example, when the cooking stove 20 is an electromagnetic stove, the current of the coil is cut off, and when the cooking stove 20 is a gas stove, the control device 50 may send a turn-off instruction to the electromagnetic valve to cut off the gas supply of the cooking stove 20, so as to turn off the burner of the cooking stove 20. It should be noted that, in one embodiment, the cooking range 20 is controlled to stop sending the alarm information while the cooking range 20 is controlled to be closed. In another embodiment, after the cooking stove 20 is controlled to be closed, the cooking stove 20 is continuously controlled to send out alarm information, and the alarm information may be a voice for prompting that the cooking stove 20 is closed, of course, the alarm information may also be expressed in other manners, which is not limited herein.

It should be noted that part or all of the functions of the control device 50 according to the embodiment of the present invention may be implemented by a controller or a processor, or a control panel, or a computer board of the cooker 20 itself, or the control device 50 is manufactured as a separate control box or a control terminal including the controller, the processor, the control panel, or the computer board, and is installed on the cooker 20, or at another location outside the cooker 20. That is, the dry burning prevention system 100 may be implemented by the cooktop 20 having the control device 50. Therefore, the protection scope of the dry burning prevention system 100 of the present invention also includes the cooking appliance 20 having the function of the control device 50.

In some embodiments, a control method comprises:

when the firepower of the cooker 20 is detected to be adjusted and/or the cooker 30 is in the state of leaving the cooker, the timing duration is cleared, or a part of the timing duration is cleared, or the alarm time threshold is prolonged.

The dry burning prevention control method can be realized by the dry burning prevention system 100 according to the embodiment of the present invention. The control method described above may be implemented by the control device 50. That is, the control device 50 is used to clear the timed duration, or clear a part of the timed duration, or extend the alarm time threshold when it is detected that the fire of the cooker 20 is adjusted and/or the pot 30 is in the out-of-pot state.

Note that, in one embodiment, when it is detected that the heating power of the cooktop 20 is adjusted, the counted time period is cleared. In another embodiment, a portion of the timed length is cleared when it is detected that the fire of the cooktop 20 is adjusted. In yet another embodiment, the alarm time threshold is extended when it is detected that the fire of the cooktop 20 is adjusted. In yet another embodiment, the timed duration is cleared when it is detected that the pot 30 is in the out-of-pot state. In yet another embodiment, a portion of the timed duration is cleared when the pot 30 is detected to be in an out-of-pot condition. In yet another embodiment, the alarm time threshold is extended when it is detected that the pot 30 is in an off-pot state.

Specifically, referring to fig. 3, in some embodiments, the fire detection sensor 60 is used to detect the fire of the cooktop 20. In the present embodiment, it is possible to determine whether the heating power of the cooker 20 is adjusted according to the heating power detected by the heating power detection sensor 60 by detecting the heating power of the cooker 20.

It should be noted that the pot 30 in the present embodiment is in the state of being away from the pot, which means that the pot 30 is not placed on the cooking utensil 20. Preferably, when determining whether the pot 30 is in the state of leaving the pot, the timing can be started when the pot 30 leaves the stove 20, and the timing duration is longer than the preset pot leaving duration, then the pot 30 is determined to be in the state of leaving the pot. Because in some food cooking scenarios, the pot 30 may leave the cooking range 20 for a short time or several times during the cooking process, and the food cooked by the pot 30 is not changed, the control method can be more accurate.

In one embodiment, whether the pot 30 is away from the pot may be detected by installing the seated pot detection contact temperature sensor 40.

In another embodiment, during cooking, whether the pot 30 is in the out-of-pot state can be determined by the temperature rising rate of the pot 30 detected by the contact temperature sensor 40 without pot detection installed on the cooking range 20, and when the cooking range 20 is heated, the temperature change value Δ T within the preset time period T is calculated, and when the temperature change value Δ T is greater than the first predetermined value, the pot 30 is determined to be in the out-of-pot state. Or when the cooker 20 is heated, calculating the slope Δ T/T of the temperature within the preset time period T, and when the slope Δ T/T of the temperature is greater than a second predetermined value, determining that the pot 30 is in the out-of-pot state. Or when the cooker 20 is heated, calculating a temperature change value delta T and a temperature gradient delta T/T within a preset time length T, and when the temperature change value delta T is greater than a first preset value and the temperature gradient delta T/T is greater than a second preset value, determining that the cooker 30 is in a cooker-leaving state.

In yet another embodiment, during cooking, whether the temperature of the pot 30 fluctuates greatly or not can be detected by the non-contact temperature sensor 40 installed on the cooking range 20, when the cooking range 20 is heated, the temperature change value Δ T within the preset time period T is calculated, and when the temperature change value Δ T is greater than the first preset value, it is determined that the pot 30 is in the off-pot state. Or when the cooker 20 is heated, calculating the slope delta T/T of the temperature within the preset time length T, and when the slope delta T/T of the temperature is greater than a second preset value, determining that the pot 30 is in the out-of-pot state. Or when the cooker 20 is heated, calculating a temperature change value delta T and a temperature gradient delta T/T within a preset time length T, and when the temperature change value delta T is greater than a first preset value and the temperature gradient delta T/T is greater than a second preset value, determining that the cooker 30 is in the out-of-cooker state. In yet another embodiment, the position sensor connected by the contact temperature sensor 40 detects whether the pot 30 is in the off-pot state.

In yet another embodiment, during cooking, it may be detected whether the pot 30 is in an out-of-pot state by an image sensor mounted on the hob 20 without the hob 20 being shut down.

In yet another embodiment, a weight sensor may be mounted on the pot support during cooking. In the cooking process, whether the cooker 30 is in the state of leaving the cooker or not is judged by measuring the weight born by the cooker support. If the measured weight is close to zero within the preset range, it is determined that the pot 30 is in the state of leaving the pot.

It is understood that in some embodiments, the means for determining whether the pot 30 is in the off-pot state may adopt any one or a combination of two or more of the above embodiments.

It should be noted that, when it is detected that the fire of the cooker 20 is adjusted and/or the pot 30 is in the off-pot state, that is, the user has already noticed the cooking condition of the cooker 20 and intervenes to operate the fire of the cooker 20 or operate the pot 30, which indicates that in this case, the pot 30 is not easy to dry-fire, so in the present embodiment, when it is detected that the fire of the cooker 20 is adjusted and/or the pot 30 is in the off-pot state, the timing duration is cleared, or a part of the timing duration is cleared, or the alarm time threshold is extended, so that the control accuracy of the dry-fire prevention function of the cooker 20 can be improved.

Referring to fig. 8, in some embodiments, the control method includes:

step S100, collecting the current firepower of the cooker 20;

step S110, obtaining a corresponding first dry burning prevention temperature value and a first alarm time value according to the current fire power of the stove 20, and setting the first dry burning prevention temperature value as a dry burning prevention temperature threshold of the stove 20 and the first alarm time value as an alarm time threshold of the stove 20.

The control method of the present embodiment may be implemented by the dry burning prevention system 100 of the present embodiment, wherein the control device 50 may implement the steps S100 and S110 of the dry burning prevention control method of the present embodiment. That is, the control device 50 is configured to obtain a corresponding first dry burning prevention temperature value and a first alarm time value according to the current fire of the stove 20, and set the first dry burning prevention temperature value as a dry burning prevention temperature threshold of the stove 20 and the first alarm time value as an alarm time threshold of the stove 20.

Specifically, referring to fig. 3, in some embodiments, the cooktop 20 includes a fire detection sensor 60, and the fire detection sensor 60 is used to detect the fire of the cooktop 20. In one embodiment, the cooking range 20 is a gas stove, the fire detection sensor 60 may be a rotatable potentiometer installed on a switch knob post of the cooking range 20, a fire adjustment position of the cooking range 20 is obtained by sensing a resistance, a voltage or a current change of the potentiometer, and the fire of the cooking range 20 is further determined. In another embodiment, the fire detection sensor 60 may be a gas flow rate sensing device installed on a gas pipeline, and the fire of the cooking stove 20 is determined by sensing the flow rate of the gas. In another embodiment, the fire detection sensor 60 may be a gas flow rate sensing device installed on a gas pipeline, and the fire of the cooking range 20 is determined by sensing the flow rate of the gas. In another embodiment, the fire detection sensor 60 may be a gas pressure sensor installed on the gas pipeline, and the fire of the cooking stove 20 is determined by sensing the pressure of the gas. The heating power of the induction cooker can be judged by detecting the current supplied to the coil or the heating power gear.

Specifically, in the present embodiment, a corresponding first dry heating prevention temperature value is obtained according to the current fire of the stove 20, and the first dry heating prevention temperature value is set as a dry heating prevention temperature threshold of the stove 20, that is, a first preset relationship between the fire of the stove 20 and the dry heating prevention temperature threshold may be established, where the first preset relationship is expressed in a form of a table or a line relation graph.

In addition, in the embodiment of the present invention, the dry burning prevention temperature threshold of the cooker 20 is directly related to the fire power of the cooker 20, that is, the greater the fire power of the cooker 20, the greater the dry burning prevention temperature threshold of the cooker 20. The smaller the firepower of the cooking range 20 is, the smaller the dry-burning prevention temperature threshold of the cooking range 20 is. When the firepower of the cooker 20 is high, the dry burning prevention temperature threshold of the cooker 20 is correspondingly set to be high, so that the condition that the fire is cut off in advance due to the fact that the cooker 20 judges the dry burning by mistake can be avoided. When the firepower of the cooker 20 is small, the dry-heating prevention temperature threshold of the cooker 20 is correspondingly set to be low, so that the time for the temperature of the cooker 30 to reach the dry-heating prevention temperature threshold can be reduced, and the dry-heating time is prevented from being too long.

Specifically, in the present embodiment, a corresponding first alarm time value is obtained according to the current firepower of the cooker 20, and the first alarm time value is set as the alarm time threshold of the cooker 20, that is, a second preset relationship between the firepower of the cooker 20 and the alarm time threshold of the cooker 20 may be established, where the second preset relationship is expressed in a form such as a table or a line relational graph.

In addition, the firepower of the cooker 20 is inversely related to the alarm time threshold of the cooker 20, that is, the larger the firepower of the cooker 20 is, the smaller the alarm time threshold of the cooker 20 is set; the smaller the firepower of the cooking range 20 is, the larger the alarm time threshold of the cooking range 20 is. When the firepower of the cooker 20 is large, the time for the cooker 30 to reach the dry-cooking state is short, and at this time, a small alarm time threshold value of the cooker 20 needs to be set, so that after the cooker 30 is determined to be in the water cooking state, the cooker 20 can be controlled to send alarm information as soon as possible to remind a user of paying attention to the cooking state of the cooker 20 in time. When the firepower of the cooker 20 is small, the time for the pot 30 to reach the dry-burning state is long, and at the moment, a large alarm time threshold value of the cooker 20 needs to be set, so that the cooker 20 can be prevented from sending alarm information too early.

It should be noted that, under the same thermal power, the temperature when the cooking range 20 is in the water cooking state to achieve the dry burning prevention is relatively low, and the temperature when the cooking range 20 is in the water-free cooking state to achieve the dry burning prevention is relatively high, so that the current dry burning prevention temperature threshold of the cooking range 20 corresponding to the water cooking state is lower than the current dry burning prevention temperature threshold of the cooking range 20 corresponding to the water-free cooking state.

Referring to fig. 9, in some embodiments, the control method includes:

step S100, collecting the current firepower of the cooker 20;

step S130, when the cooking range 20 is in a water cooking state, acquiring the thermal conductivity of the pot 30 according to the temperature of the pot 30, and acquiring a corresponding alarm time threshold and a dry-burning prevention temperature threshold of the cooking range 20 according to the current firepower of the cooking range 20 and the thermal conductivity of the pot 30.

The control method described above can be implemented by the dry burning prevention system 100 according to the embodiment of the present invention, wherein the control device 50 can implement the steps S100 and S130 of the dry burning prevention control method according to the embodiment of the present invention. That is, the control device 50 is configured to obtain the thermal conductivity of the pot 30 according to the temperature of the pot 30 when the cooking range 20 is in the water cooking state, and obtain the corresponding alarm time threshold and the dry-heating prevention temperature threshold of the cooking range 20 according to the current fire power of the cooking range 20 and the thermal conductivity of the pot 30.

Therefore, when the cooker 20 is in a water cooking state, the corresponding alarm time threshold and the dry burning prevention temperature threshold are obtained according to the current firepower of the cooker 20 and the heat conductivity of the cooker 30, so that a more appropriate alarm time threshold and a more appropriate dry burning prevention temperature threshold can be obtained, the cooker 20 can timely inform a user of paying attention to the cooking state of the cooker 20, and the dry burning prevention function can be accurately started when the cooker 20 reaches the dry burning prevention state, so that misjudgment is avoided.

Referring to fig. 10, in some embodiments, step S130 includes:

step S132, determining whether the pot boiling temperature of the pot 30 is less than or equal to the preset heat conducting temperature,

if yes, step S134, obtaining a second dry burning prevention temperature value and a second alarm time value according to the current firepower of the cooker 20 and the thermal conductivity of the pot 30, and setting the second dry burning prevention temperature value as a dry burning prevention temperature threshold of the cooker 20 and the second alarm time value as an alarm time threshold of the cooker 20.

If not, step S136, obtaining a third dry-burning prevention temperature value and a third alarm time value according to the current firepower of the cooker 20 and the thermal conductivity of the pot 30, and setting the third dry-burning prevention temperature value as a dry-burning prevention temperature threshold value of the cooker 20 and setting the third alarm time value as an alarm time threshold value of the cooker 20.

The control method described above can be implemented by the dry burning prevention system 100 according to the embodiment of the present invention, wherein steps S132, S134, and S136 of the dry burning prevention control method according to the embodiment of the present invention can be implemented by the control device 50. That is to say, the control device 50 is configured to determine whether the pot boiling temperature of the pot 30 is less than or equal to the preset heat conduction temperature, and if so, obtain a second dry burning prevention temperature value and a second alarm time value according to the current fire of the stove 20 and the heat conductivity of the pot 30, and set the second dry burning prevention temperature value as the dry burning prevention temperature threshold of the stove 20 and the second alarm time value as the alarm time threshold of the stove 20. If not, acquiring a third dry burning prevention temperature value and a third alarm time value according to the current firepower of the cooker 20 and the heat conductivity of the cooker 30, and setting the third dry burning prevention temperature value as an anti-dry burning prevention temperature threshold value of the cooker 20 and setting the third alarm time value as an alarm time threshold value of the cooker 20.

Therefore, the cooker 20 can inform the user of the cooking state of the cooker 20 in time and can accurately start the dry burning prevention function when the cooker 20 reaches the dry burning prevention state, so as to avoid misjudgment.

Specifically, in the water cooking state, the pot boiling temperature Tb of the pot 30 with better thermal conductivity is smaller when cooking, so that under the same fire power of the cooker 20, the thermal conductivity of the pot 30 is better, the set dry-burning prevention temperature threshold value is smaller, and the set alarm temperature threshold value is larger. It should be noted that the temperature rise speed of the bottom of the pot 30 is the fastest at the time of a big fire, the temperature rise speed of the bottom of the pot 30 is the second highest at the time of a middle fire, and the temperature rise speed of the bottom of the pot 30 is the slowest at the time of a small fire. Thus, in order to reduce the dry-fire time for medium and small fires, a lower dry-fire prevention temperature threshold may be set than for large fires, and in addition, because the medium and small fires reach a dry-fire state for a longer time than for large fires, a greater warning temperature threshold may be set than for large fires in order to avoid too early warning of the cooking appliance 20. That is, under the thermal conductivity of the same pot 30, the smaller the heating power of the cooking range 20 is, the smaller the set dry heating prevention temperature threshold is, and the larger the set alarm temperature threshold is.

Referring to fig. 5, for a pot 30 with good thermal conductivity, such as a metal pot 30, when the water in the pot is boiling, the temperature of the outer surface of the pot bottom is lower, for example, 110 ℃ to 130 ℃, as shown in the temperature-time curve 1; for a pot 30 with poor thermal conductivity, such as a casserole, the temperature of the outer surface of the pot bottom is higher when the water in the pot is boiling. E.g., 140 c to 180 c, as shown in temperature time curve 2. Therefore, the type of the pot 30 can be determined by comparing the boiling temperature of the pot during boiling with the preset heat conducting temperature. The preset heat conduction temperature can be calibrated according to the heat conductivity of the pot 30. Further, under the fire power of the same cooker 20, different alarm time thresholds and dry burning prevention temperature thresholds can be determined by comparing the boiling temperature of the cooker with the preset heat conduction temperature, so that the cooker 20 can timely inform a user of paying attention to the cooking state of the cooker 20 and accurately start the dry burning prevention function when the cooker 20 reaches the dry burning prevention state, thereby avoiding misjudgment and having good user experience.

In some embodiments, a control method comprises:

and controlling the cooker 20 to be closed when the cooker 20 is determined to be in the water-free cooking state and the temperature of the cooker 30 is greater than the dry burning prevention threshold value of the cooker 20.

The control method described above may be implemented by the control device 50. That is, the control means 50 is for controlling the hob 20 to be turned off when it is determined that the hob 20 is in the water free cooking state and when the temperature of the pot 30 is greater than the dry burning prevention threshold of the hob 20.

Therefore, the dry burning prevention function can be accurately started when the stove 20 reaches the dry burning prevention state, misjudgment is avoided, and the user experience is good.

It should be noted that, when the cooking range 20 is in the waterless cooking state, the dry-heating prevention temperature thresholds of different cooking ranges 20 can be obtained according to different firepowers of the cooking ranges 20. The larger the firepower is, the larger the anti-dry temperature threshold of the cooking range 20 is. In the present embodiment, since the temperature of the pot 30 changes greatly when the cooker 20 is in the waterless cooking state, in order to avoid frequent erroneous determination of the cooker 20 and interference with the user, the cooker 20 is in the waterless cooking state. The alarm time threshold of the hob 20 is not set.

It should be noted that, in the above embodiment, when the collected temperature quantity of the pot 30 is not enough to judge the cooking state of the cooker 20, the step S510 is entered, and the dry-burning prevention temperature threshold of the cooker 20 is obtained according to the current fire power of the cooker 20. That is, the dry-heating prevention temperature threshold of the cooker 20 is directly obtained by the control strategy of the waterless cooking state.

In some embodiments, the alarm time threshold includes a plurality of different alarm time thresholds, the plurality of alarm time thresholds define a plurality of alarm ranges, the alarm information includes a plurality of alarm information, each alarm range corresponds to an alarm information, and the controlling the cooker 20 in step S40 sends out the alarm information, including:

and controlling the kitchen range 20 to send alarm information corresponding to the alarm range according to the alarm range where the timed duration is located.

The control method described above may be implemented by the control device 50. That is to say, the control device 50 is configured to control the cooker 20 to send out alarm information corresponding to the alarm range according to the alarm range where the timed duration is located.

So, the alarm range that the length of time of according to timing was located sends the alarm information that corresponds with the alarm range with control cooking utensils 20, can let the user learn the dry combustion method state of cooking utensils 20 through the alarm information that corresponds like this to in time make the processing, user experience nature is good.

Specifically, in one embodiment, the alarm time thresholds of the cooktop 20 respectively include a first alarm time threshold a and a second alarm time threshold B, where the first alarm time threshold a is smaller than the second alarm time threshold B. The first alarm time value threshold a and the second alarm time threshold B together define two alarm ranges a, B) and B, + ∞). When the timed duration is in the alarm range [ a, B), the control cooker 20 sends out a first alarm message, for example, the alarm sound alarms every 60 seconds, and lasts for 3 seconds each time. When the timed duration is in the alarm range [ B, + ∞ "), the cooking utensil 20 is controlled to send out second alarm information, for example, the alarm sound alarms once every 30 seconds, lasts 3 seconds each time, and along with the continuous rise of the temperature of the pot 30, when the temperature of the pot 30 is greater than the dry-burning prevention temperature threshold, the cooking utensil 20 can be controlled to be closed and stop sending out alarm information.

It should be noted that the alarm time threshold of the present embodiment may be understood as a time period from the time when the cooking range 20 is determined to be in the water cooking state to the time when the cooking range 20 is controlled to send out the alarm information for the first time. When the warning time threshold of the cooking range 20 is multiple, that is, the multiple warning time thresholds jointly define multiple warning ranges. The size of the alarm range is understood in the present embodiment as the size of the numerical value of the alarm range, and is not the size of the time period difference range defined by the alarm range. For example, when the alarm time thresholds of the cooking range 20 are three, which are 0.5h, 0.8h and 1h, respectively, the three alarm time thresholds define the ranges of [0.5h, 0.8h), [0.8h, 1h) and [1h, + ∞), and the magnitude relationship of the values of the alarm ranges is: [1h, + ∞) > [0.8h, 1h) > [0.5h, 0.8 h).

In some embodiments, the alert information includes a sound having a frequency that is positively correlated with the magnitude of the value of the alert range. Specifically, the larger the value of the alarm range, the higher the frequency of the sound. In one embodiment, the alarm information is an alarm sound. When the timing duration falls within the alarm range of [0.5h, 0.8h), the alarm sound alarms once every 60 seconds, wherein each time lasts for 3 seconds, and the alarm sound is low-frequency sound. When the timed duration is within the alarm range of [0.8h, 1h), the alarm sound alarms once every 30 seconds, lasts for 3 seconds each time, and is a medium-frequency sound. When the timing duration falls within the alarm range of [1h, + ∞ ], the alarm sound is given once every 15 seconds, lasts for 3 seconds each time, and is a high-frequency sound.

In some embodiments, the alert information includes a light having a flashing frequency that is positively correlated with the magnitude of the value of the alert range. Specifically, the higher the value of the alarm range, the higher the blinking frequency of the light, that is, the longer the integration of the time period of the timer, the higher the blinking frequency of the light. In one embodiment, the alarm information is light emitted from an alarm display lamp. When the timing time length falls within the alarm range of [0.5h, 0.8h), the alarm display lamp flashes every 60 seconds, and the time lasts for 3 seconds. When the timing time length falls within the alarm range of [0.8h, 1h), the alarm display lamp flashes every 30 seconds, and the time lasts for 3 seconds. When the time length of the timing falls within the alarm range of [1h, + ∞), the alarm display lamp flashes every 15 seconds, each time lasting 3 seconds.

It should be noted that, when the temperature of the pot 30 is greater than the alarm time threshold, in one embodiment, the cooker 20 may be controlled to simultaneously emit an alarm sound and flash an alarm display lamp. In another embodiment, only the cooking range 20 is controlled to emit an alarm sound at the same time, for example, a preset voice "please note pot temperature, prevent dry burning" is emitted. In yet another embodiment, only cooktop 20 is controlled to flash an alarm display light, e.g., an alarm display light flashes red in an alarm. The alarm information may be set according to the actual needs of the user, and is not limited herein.

Referring to fig. 11, in some embodiments, the control method includes:

step S210, receiving an alarm termination instruction;

and step S220, controlling the kitchen range 20 to stop sending alarm information and clearing timing data according to the alarm termination instruction.

The control method described above can be implemented by the dry combustion preventing system 100 according to the embodiment of the present invention. Here, steps S210 and S220 of the dry-burning prevention control method according to the embodiment of the present invention may be implemented by the control device 50. That is, the control device 50 is configured to receive an alarm termination instruction; and controlling the stove 20 to stop sending alarm information and clearing timing data according to the alarm termination instruction.

Therefore, the alarm of the cooker 20 can be flexibly controlled according to the user requirements, and the user experience is good.

Specifically, a button or a knob may be disposed on the cooker 20, and after a user presses the button or rotates the knob, the alarm of the cooker 20 may be released within a preset time (e.g., 2 seconds), and then automatically returns to the state to be alarmed. In one embodiment, the warning knob of the cooktop 20 may be shared with the ignition knob.

Referring to fig. 12, in some embodiments, the control method further includes:

in step S230, an alarm function activation instruction is received, and the process proceeds to step S10.

The control method described above can be implemented by the dry combustion preventing system 100 according to the embodiment of the present invention. Step S230 of the dry-burning prevention control method according to the embodiment of the present invention may be implemented by the control device 50. That is, the control device 50 is configured to receive the alarm function activation instruction and then proceed to step S10. Therefore, the cooker 20 can be controlled to send alarm information according to the alarm function opening instruction, so that the requirements of users are easily met, and the user experience is good.

It should be noted that, in the embodiment of the present invention, an alarm function button may be disposed on the kitchen range 20, and when the kitchen range 20 leaves a factory, the alarm function is turned off by default. Under the condition that the alarm function is closed, when the alarm function key is operated, the stove 20 generates an alarm function opening instruction, the control device 50 can receive the alarm function opening instruction, the step S10 is carried out, whether the stove 20 is in a water cooking state or not is further determined according to the temperature of the cooker 30, and timing is started when the stove 20 is determined to be in the water cooking state; when the timed duration is greater than the alarm time threshold of the cooker 20 and the temperature of the cooker 30 is not greater than the dry-burning prevention temperature threshold of the cooker 20, the cooker 20 is controlled to send out alarm information. Under the condition that the alarm function is turned on, when the alarm function key is operated, the cooker 20 generates an alarm function turn-off instruction, the control device 50 can receive the alarm function turn-off instruction, and does not enter the step S10, that is, the temperature of the cooker 30 is not collected, or when the timing duration is greater than the alarm time threshold of the cooker 20 and the temperature of the cooker 30 is not greater than the dry-burning prevention temperature threshold of the cooker 20, the cooker 20 is controlled not to send out alarm information. It is understood that in other embodiments, the warning function may be turned on by default when the cooktop 20 leaves the factory. In other embodiments, an alarm function on button and an alarm function off button may be provided on the cooktop 20.

Further, an alarm volume button may be disposed on the cooker 20, and a user may adjust the volume of the sound emitted during the alarm by adjusting the alarm volume button.

Specifically, in a specific practical application scenario, a corresponding alarm time threshold and an anti-dry-heating temperature threshold are obtained according to a cooking state of the pot 30, a thermal conductivity of the pot 30, and a current firepower of the pot 30.

The first embodiment, the second embodiment and the third embodiment are embodiments in which the cooker 20 is in different firepower when the cooker 30 is in a water cooking state and the cooker boiling temperature of the cooker 30 is less than or equal to the preset heat conducting temperature.

The first embodiment is as follows: when the cooktop 20 is on a fire, the dry-fire prevention temperature threshold of the cooktop 20 is set at T1 — 210 ℃. In one embodiment, when the number of alarm time thresholds of the cooktop 20 is one, the alarm time threshold may be set to W1 ═ 0.5 h. When the cooking range 20 is determined to be in the water cooking state, that is, when the pot boiling temperature of the pot 30 is detected, timing is started, after 0.5h, and when the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T1 of the cooking range 20, the cooking range 20 is controlled to send out alarm information corresponding to the water cooking state and the fire power of the cooking range 20 for alarming, for example, the control device 50 may control the cooking range 20 to send out an alarm sound every 60 seconds, wherein each alarm sound lasts for 3 seconds. In another embodiment, when the number of the alarm time thresholds of the cooktop 20 is two, the alarm time thresholds may be set to W1 ═ 0.5h and W2 ═ 0.8 h. When the temperature of the pot 30 is greater than the alarm time threshold W1 and less than or equal to W2 and the temperature of the pot 30 is not greater than the dry-burning prevention temperature threshold T1 of the cooker 20, the control device 50 may control the cooker 20 to emit an alarm sound every 60 seconds, wherein the alarm sound lasts 3 seconds every time, and the alarm sound is a low-frequency alarm sound. When the temperature of the pot 30 is greater than the alarm time threshold W2 and the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T1 of the cooker 20, the control device 50 can control the cooker 20 to send out an alarm sound every 30 seconds, the alarm sound lasts 3 seconds every time, and the alarm sound is a high-frequency alarm sound. When the temperature of the pot 30 is greater than the dry burning prevention threshold T1 of the cooker 20, in one embodiment, the cooker 20 is controlled to be turned off and the cooker 20 is controlled to stop sending alarm information. In another embodiment, the cooking appliance 20 is controlled to be closed and the cooking appliance 20 is continuously controlled to send alarm information, the alarm information can be voice prompting that the cooking appliance 20 is closed, the alarm information is not limited here, and the alarm information can be set according to actual requirements.

Example two: when the cooktop 20 is on a medium fire, the dry-fire prevention temperature threshold of the cooktop 20 is set at T2 ═ 190 ℃. In one embodiment, when the number of alarm time thresholds of the cooktop 20 is one, the alarm time threshold may be set to W3 ═ 0.6 h. When the cooking range 20 is determined to be in the water cooking state, that is, when the pot boiling temperature of the pot 30 is detected, timing is started, after 0.6h, and when the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T2 of the cooking range 20, the cooking range 20 is controlled to send out alarm information corresponding to the water cooking state and the fire power of the cooking range 20 for alarming, for example, the control device 50 may control the cooking range 20 to send out an alarm sound every 60 seconds, wherein each alarm sound lasts for 3 seconds. In another embodiment, when the number of the alarm time thresholds of the cooktop 20 is two, the alarm time thresholds may be set to W3 ═ 0.6h and W4 ═ 0.9 h. When the temperature of the pot 30 is greater than the alarm time threshold W3 and less than or equal to W4 and the temperature of the pot 30 is not greater than the dry-burning prevention temperature threshold T2 of the cooker 20, the control device 50 may control the cooker 20 to emit an alarm sound every 60 seconds, wherein the alarm sound lasts 3 seconds every time, and the alarm sound is a low-frequency alarm sound. When the temperature of the pot 30 is greater than the alarm time threshold W4 and the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T2 of the cooker 20, the control device 50 can control the cooker 20 to send out an alarm sound every 30 seconds, the alarm sound lasts 3 seconds every time, and the alarm sound is a high-frequency alarm sound. When the temperature of the pot 30 is greater than the dry burning prevention threshold T2 of the cooker 20, in one embodiment, the cooker 20 is controlled to be turned off and the cooker 20 is controlled to stop sending alarm information. In another embodiment, the cooking appliance 20 is controlled to be closed and the cooking appliance 20 is continuously controlled to send alarm information, the alarm information can be voice prompting that the cooking appliance 20 is closed, the alarm information is not limited here, and the alarm information can be set according to actual requirements.

Example three: when the cooktop 20 is on a small fire, the dry-fire prevention temperature threshold of the cooktop 20 is set at 170 ℃. In one embodiment, when the number of alarm time thresholds of the cooktop 20 is one, the alarm time threshold may be set to W5 ═ 0.7 h. When the cooking range 20 is determined to be in the water cooking state, that is, when the pot boiling temperature of the pot 30 is detected, timing is started, after 0.7h, and when the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T3 of the cooking range 20, the cooking range 20 is controlled to send out alarm information corresponding to the water cooking state and the fire power of the cooking range 20 for alarming, for example, the control device 50 may control the cooking range 20 to send out an alarm sound every 60 seconds, wherein each alarm sound lasts for 3 seconds. In another embodiment, when the number of the alarm time thresholds of the cooktop 20 is two, the alarm time thresholds may be set to W5 ═ 0.7h and W6 ═ 1.0 h. When the temperature of the pot 30 is greater than the alarm time threshold W5 and less than or equal to W6 and the temperature of the pot 30 is not greater than the dry-burning prevention temperature threshold T3 of the cooker 20, the control device 50 may control the cooker 20 to emit an alarm sound every 60 seconds, wherein the alarm sound lasts 3 seconds every time, and the alarm sound is a low-frequency alarm sound. When the temperature of the pot 30 is greater than the alarm time threshold W6 and the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T3 of the cooker 20, the control device 50 can control the cooker 20 to send out an alarm sound every 30 seconds, the alarm sound lasts 3 seconds every time, and the alarm sound is a high-frequency alarm sound. When the temperature of the pot 30 is greater than the dry burning prevention threshold T3 of the cooker 20, in one embodiment, the cooker 20 is controlled to be turned off and the cooker 20 is controlled to stop sending alarm information. In another embodiment, the cooking appliance 20 is controlled to be closed and the cooking appliance 20 is continuously controlled to send alarm information, the alarm information can be voice prompting that the cooking appliance 20 is closed, the alarm information is not limited here, and the alarm information can be set according to actual requirements.

The fourth embodiment, the fifth embodiment and the sixth embodiment are embodiments in which the cooker 30 is in a water cooking state, and when the boiling temperature of the cooker is higher than the preset heat conducting temperature, the cooker 20 is in different firepower.

Example four: when the cooktop 20 is on a fire, the dry-fire prevention temperature threshold of the cooktop 20 is set at 250 ℃ T4. In one embodiment, when the number of alarm time thresholds of the cooktop 20 is one, the alarm time threshold may be set to W7 ═ 0.9 h. When the cooking range 20 is determined to be in the water cooking state, that is, when the pot boiling temperature of the pot 30 is detected, timing is started, after 0.9h, and when the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T4 of the cooking range 20, the cooking range 20 is controlled to send out alarm information corresponding to the water cooking state and the fire power of the cooking range 20 for alarming, for example, the control device 50 may control the cooking range 20 to send out an alarm sound every 60 seconds, wherein each alarm sound lasts for 3 seconds. In another embodiment, when the number of the alarm time thresholds of the cooktop 20 is two, the alarm time thresholds may be set to W7 ═ 0.9h and W8 ═ 1.1 h. When the temperature of the pot 30 is greater than the alarm time threshold W7 and less than or equal to W8 and the temperature of the pot 30 is not greater than the dry-burning prevention temperature threshold T4 of the cooker 20, the control device 50 may control the cooker 20 to emit an alarm sound every 60 seconds, wherein the alarm sound lasts 3 seconds every time, and the alarm sound is a low-frequency alarm sound. When the temperature of the pot 30 is greater than the alarm time threshold W8 and the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T4 of the cooker 20, the control device 50 can control the cooker 20 to send out an alarm sound every 30 seconds, the alarm sound lasts 3 seconds every time, and the alarm sound is a high-frequency alarm sound. When the temperature of the pot 30 is greater than the dry burning prevention threshold T4 of the cooker 20, in one embodiment, the cooker 20 is controlled to be turned off and the cooker 20 is controlled to stop sending alarm information. In another embodiment, the cooking appliance 20 is controlled to be closed and the cooking appliance 20 is continuously controlled to send alarm information, the alarm information can be voice prompting that the cooking appliance 20 is closed, the alarm information is not limited here, and the alarm information can be set according to actual requirements.

Example five: when the cooking range 20 is on a medium fire, the dry burning prevention temperature threshold of the cooking range 20 is set to be 230 ℃ at T5. In one embodiment, when the number of alarm time thresholds of the cooktop 20 is one, the alarm time threshold may be set to W9 ═ 1.0 h. When the cooking range 20 is determined to be in the water cooking state, that is, when the pot boiling temperature of the pot 30 is detected, timing is started, after 1.0 hour elapses and the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T5 of the cooking range 20 at this time, the cooking range 20 is controlled to issue an alarm message corresponding to the water cooking state and the fire power of the cooking range 20 to alarm, for example, the control device 50 may control the cooking range 20 to issue an alarm sound every 60 seconds, and each alarm sound lasts for 3 seconds. In another embodiment, when the number of the alarm time thresholds of the cooktop 20 is two, the alarm time thresholds may be set to W9 ═ 1.0h and W10 ═ 1.2 h. When the temperature of the pot 30 is greater than the alarm time threshold W9 and less than or equal to W10 and the temperature of the pot 30 is not greater than the dry-burning prevention temperature threshold T5 of the cooker 20, the control device 50 may control the cooker 20 to emit an alarm sound every 60 seconds, wherein the alarm sound lasts 3 seconds every time, and the alarm sound is a low-frequency alarm sound. When the temperature of the pot 30 is greater than the alarm time threshold W10 and the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T5 of the cooker 20, the control device 50 can control the cooker 20 to send out an alarm sound every 30 seconds, the alarm sound lasts 3 seconds every time, and the alarm sound is a high-frequency alarm sound. When the temperature of the pot 30 is greater than the dry burning prevention threshold T5 of the cooker 20, in one embodiment, the cooker 20 is controlled to be turned off and the cooker 20 is controlled to stop sending alarm information. In another embodiment, the cooking appliance 20 is controlled to be closed and the cooking appliance 20 is continuously controlled to send alarm information, the alarm information can be voice prompting that the cooking appliance 20 is closed, the alarm information is not limited here, and the alarm information can be set according to actual requirements.

Example six: when the cooktop 20 is on a small fire, the dry-fire prevention temperature threshold of the cooktop 20 is set at 210 ℃ T6. In one embodiment, when the number of alarm time thresholds of the cooktop 20 is one, the alarm time threshold may be set to W11 ═ 1.1 h. When the cooking range 20 is determined to be in the water cooking state, that is, when the pot boiling temperature of the pot 30 is detected, timing is started, after 1.1h, and when the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T6 of the cooking range 20, the cooking range 20 is controlled to send out alarm information corresponding to the water cooking state and the fire power of the cooking range 20 for alarming, for example, the control device 50 may control the cooking range 20 to send out an alarm sound every 60 seconds, wherein each alarm sound lasts for 3 seconds. In another embodiment, when the number of the alarm time thresholds of the cooktop 20 is two, the alarm time thresholds may be set to W11 ═ 1.1h and W12 ═ 1.3 h. When the temperature of the pot 30 is greater than the alarm time threshold W11 and less than or equal to W12 and the temperature of the pot 30 is not greater than the dry-burning prevention temperature threshold T6 of the cooker 20, the control device 50 may control the cooker 20 to emit an alarm sound every 60 seconds, wherein the alarm sound lasts 3 seconds every time, and the alarm sound is a low-frequency alarm sound. When the temperature of the pot 30 is greater than the alarm time threshold W12 and the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T6 of the cooker 20, the control device 50 can control the cooker 20 to send out an alarm sound every 30 seconds, the alarm sound lasts 3 seconds every time, and the alarm sound is a high-frequency alarm sound. When the temperature of the pot 30 is greater than the dry burning prevention threshold T6 of the cooker 20, in one embodiment, the cooker 20 is controlled to be turned off and the cooker 20 is controlled to stop sending alarm information. In another embodiment, the cooking appliance 20 is controlled to be closed and the cooking appliance 20 is continuously controlled to send alarm information, the alarm information can be voice prompting that the cooking appliance 20 is closed, the alarm information is not limited here, and the alarm information can be set according to actual requirements.

Note that when the cooktop 20 is in the water-free cooking state, the dry-heating prevention temperature threshold of the cooktop 20 may be set to T7-290 ℃. When the cooktop 20 is on a medium fire, the dry-fire prevention temperature threshold of the cooktop 20 may be set at T8 ═ 260 ℃. When the cooktop 20 is on a small fire, the dry-fire prevention temperature threshold of the cooktop 20 may be set at T9-230 ℃. In order to avoid interference to the user caused by frequent occurrence of false dry-fire prevention judgment when cooking is performed in a water-free cooking state, in this case, it is not necessary to set an alarm time threshold of the cooker 20.

By combining the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment and the dry burning prevention temperature threshold set according to the fire power when the cooking range 20 is in the anhydrous cooking state, the flow one of the following control methods can be summarized.

Flow one (refer to fig. 13)

A1, opening the cooking range 20.

A2, temperature sensor 40 collects temperature T of pot 30_k。

A3, control 50 determines the cooking state of cooktop 20. If the cooking range 20 is in a water cooking state, entering the step A4; if the cooking range 20 is in the water-free cooking state, the step A9 is entered.

And A4, starting timing.

A5, the control device 50 reads the current firepower P of the cooking range 20.

A6, the control device 50 determines whether the temperature of the pan 30 detected currently exceeds the dry-heating prevention temperature threshold corresponding to the cooking state with water, the thermal conductivity of the pan 30 and the current fire power of the cooker 20. If yes, go to step A11; if not, go to step A7.

A7, control device 50 determines whether the current accumulated time exceeds the alarm time threshold corresponding to the water cooking state, the heat conductivity of pot 30, the current fire power of cooking utensil 20 and the alarm information. If yes, go to step A8; if not, go to step A2.

A8, the control device 50 controls the buzzer to send out alarm information corresponding to the alarm time threshold value, and returns to the step A2.

A9, the control device 50 reads the current firepower P of the cooking range 20.

A10, control device 50 determines whether the temperature of pan 30 detected currently exceeds the dry-heating prevention temperature threshold corresponding to the no-water cooking state and the current fire power of cooker 20. If yes, go to step A11; if not, go to step A2.

A11, controlling the cooking range 20 to be closed.

The seventh, eighth and ninth embodiments are embodiments in which the cooking range 20 is in a water cooking state, and the cooking range 20 is in different firepower regardless of the heat conductivity of the pan. Wherein, the boiling temperature of the pot 30 is T_b。

Example seven: when the cooktop 20 is on a fire, the dry-fire prevention temperature threshold of the cooktop 20 is set to T10 ═ (T_b+80) deg.C. In one embodiment, when the number of alarm time thresholds of the cooktop 20 is one, the alarm time threshold may be set to W13 ═ 0.8 h. When it is determined that the cooking appliance 20 is in the water cooking state, that is, the pot boiling temperature T of the pot 30 is detected_bThe timing is started, after 0.8h, and when the temperature of the pot 30 is not more than the dry-heating prevention temperature threshold T10 of the cooker 20, the cooker 20 is controlled to send alarm information corresponding to the water cooking state and the firepower of the cooker 20 to give an alarm, for example, the control device 50 can control the cooker 20 to send an alarm sound every 60 seconds, and the alarm sound lasts for 3 seconds every time. In another embodiment, when the number of the alarm time thresholds of the cooktop 20 is two, the alarm time thresholds may be set to W13 ═ 0.8h and W14 ═ 1.0 h. When the temperature of the pot 30 is greater than the alarm time threshold W13 and less than or equal to W14 and the temperature of the pot 30 is not greater than the dry-burning prevention temperature threshold T10 of the cooker 20, the control device 50 may control the cooker 20 to emit an alarm sound every 60 seconds, wherein the alarm sound lasts 3 seconds every time, and the alarm sound is a low-frequency alarm sound. When the temperature of the pot 30 is greater than the alarm time threshold W14 and the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T10 of the cooker 20, the control device 50 can control the cooker 20 to send out an alarm sound every 30 seconds, the alarm sound lasts 3 seconds every time, and the alarm sound is a high-frequency alarm sound. When the temperature of the pot 30 is greater than the dry burning prevention threshold T10 of the cooker 20, in one embodiment, the cooker 20 is controlled to be turned off and the cooker 20 is controlled to stop sending alarm information. In another embodiment, the cooking appliance 20 is controlled to be closed and the cooking appliance 20 is continuously controlled to send alarm information, the alarm information can be voice prompting that the cooking appliance 20 is closed, the alarm information is not limited here, and the alarm information can be set according to actual requirements.

Example eight: when the cooktop 20 is on a medium fire, the dry-fire prevention temperature threshold of the cooktop 20 is set to T11 ═ (T_b+70) deg.C. In one embodiment, when the number of alarm time thresholds of the cooktop 20 is one, the alarm time threshold may be set to W15 ═ 0.9 h. When it is determined that the cooking appliance 20 is in the water cooking state, that is, the pot boiling temperature T of the pot 30 is detected_bTiming is started, after 0.9h, and when the temperature of the cookware 30 is not more than the dry-burning prevention temperature threshold T11 of the cooker 20, the cooker 20 is controlled to send alarm information corresponding to the water cooking state and the firepower of the cooker 20 for alarming, for example, the control device 50 can control the cooker 20 to send alarm sound every 60 seconds, and alarm sound every timeThe alarm sound lasts 3 seconds. In another embodiment, when the number of the alarm time thresholds of the cooktop 20 is two, the alarm time thresholds may be set to W15 ═ 0.9h and W16 ═ 1.1 h. When the temperature of the pot 30 is greater than the alarm time threshold W15 and less than or equal to W16 and the temperature of the pot 30 is not greater than the dry-burning prevention temperature threshold T11 of the cooker 20, the control device 50 may control the cooker 20 to emit an alarm sound every 60 seconds, wherein the alarm sound lasts 3 seconds every time, and the alarm sound is a low-frequency alarm sound. When the temperature of the pot 30 is greater than the alarm time threshold W16 and the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T11 of the cooker 20, the control device 50 can control the cooker 20 to send out an alarm sound every 30 seconds, the alarm sound lasts 3 seconds every time, and the alarm sound is a high-frequency alarm sound. When the temperature of the pot 30 is greater than the dry burning prevention threshold T11 of the cooker 20, in one embodiment, the cooker 20 is controlled to be turned off and the cooker 20 is controlled to stop sending alarm information. In another embodiment, the cooking appliance 20 is controlled to be closed and the cooking appliance 20 is continuously controlled to send alarm information, the alarm information can be voice prompting that the cooking appliance 20 is closed, the alarm information is not limited here, and the alarm information can be set according to actual requirements.

Example nine: when the cooktop 20 is on a small fire, the dry-fire prevention temperature threshold of the cooktop 20 is set to T12 ═ (T_b+60) deg.C. In one embodiment, when the number of alarm time thresholds of the cooktop 20 is one, the alarm time threshold may be set to W17 ═ 1.0 h. When it is determined that the cooking appliance 20 is in the water cooking state, that is, the pot boiling temperature T of the pot 30 is detected_bThe timing is started, after 1.0 hour, and when the temperature of the pot 30 is not more than the dry-heating prevention temperature threshold T12 of the cooker 20, the cooker 20 is controlled to send alarm information corresponding to the water cooking state and the firepower of the cooker 20 to give an alarm, for example, the control device 50 can control the cooker 20 to send an alarm sound every 60 seconds, and the alarm sound lasts for 3 seconds every time. In another embodiment, when the number of the alarm time thresholds of the cooktop 20 is two, the alarm time thresholds may be set to W17 ═ 1.0h and W18 ═ 1.2 h. When the temperature of the pot 30 is greater than the alarm time threshold value W18 and less than or equal to W18 and the temperature of the pot 30 is not greater than the dry burning prevention of the cooker 20When the temperature is T12, the control device 50 can control the cooker 20 to send out an alarm sound every 60 seconds, wherein the alarm sound lasts 3 seconds every time, and the alarm sound is a low-frequency alarm sound. When the temperature of the pot 30 is greater than the alarm time threshold W18 and the temperature of the pot 30 is not greater than the dry-heating prevention temperature threshold T12 of the cooker 20, the control device 50 can control the cooker 20 to send out an alarm sound every 30 seconds, the alarm sound lasts 3 seconds every time, and the alarm sound is a high-frequency alarm sound. When the temperature of the pot 30 is greater than the dry burning prevention threshold T12 of the cooker 20, in one embodiment, the cooker 20 is controlled to be turned off and the cooker 20 is controlled to stop sending alarm information. In another embodiment, the cooking appliance 20 is controlled to be closed and the cooking appliance 20 is continuously controlled to send alarm information, the alarm information can be voice prompting that the cooking appliance 20 is closed, the alarm information is not limited here, and the alarm information can be set according to actual requirements.

Combining the seventh embodiment, the eighth embodiment, and the ninth embodiment, and the dry-burning prevention temperature threshold set according to the fire power when the cooking range 20 is in the anhydrous cooking state, the flow can be summarized as the second flow of the following control method.

Flow two (refer to fig. 14)

A1, opening the cooking range 20.

A2, temperature T collected by temperature sensor 40_k。

And A4, starting timing.

A6, control device 50 determines whether the temperature of pan 30 detected currently exceeds the dry-burning prevention temperature threshold corresponding to the water cooking state and the current fire power of cooking utensil 20. If yes, go to step A11; if not, go to step A7.

A7, control device 50 judges whether the current accumulated time length exceeds the alarm time threshold corresponding to the water cooking state, the current firepower of cooking utensil 20 and the alarm information. If yes, go to step A8; if not, go to step A2.

A8, control device 50 controls the buzzer to alarm information corresponding to the alarm time threshold, and returns to step a 2.

A11, controlling the cooking range 20 to be closed.

In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processing module-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection having one or more wires (control method), a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of embodiments of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A control method for preventing dry burning is used for a kitchen range, and is characterized in that the control method for preventing dry burning comprises the following steps:

collecting the temperature of the pot;

starting timing when the cooker is determined to be in the water cooking state;

when the temperature of the cooker is higher than the dry-burning prevention temperature threshold value of the cooker, controlling the cooker to be closed;

the control method further comprises the following steps:

when detecting that the firepower of the cooker is adjusted and/or the cooker is in a state of leaving the cooker, clearing the timed duration, or clearing a part of the timed duration, or prolonging the alarm time threshold;

alarm time threshold value includes a plurality of different alarm time threshold values, a plurality of alarm ranges are injectd to a plurality of alarm time threshold values, alarm information includes a plurality of alarm information, every alarm range corresponds one alarm information, control cooking utensils send alarm information, include:

2. The control method according to claim 1, characterized by comprising:

3. The control method of claim 1, wherein determining whether the cooker is in a water cooking state according to the temperature of the pot comprises:

if so, determining that the stove is in the water cooking state;

if not, determining that the stove is in a waterless cooking state.

4. The control method of claim 3, wherein determining whether a boiling section exists according to the temperature of the pot comprises:

5. The control method according to claim 4, wherein the rate of change of the temperature of the pot in the preset time period comprises at least one of:

the variance of the temperature of the cookware within the preset time length;

6. The control method according to claim 4, characterized by comprising: work as the cooking utensils are in when having water culinary art state, according to the temperature of pan acquires the heat conductivity of pan, gather the current firepower of cooking utensils and according to the current firepower of cooking utensils with the heat conductivity of pan acquires the correspondence alarm time threshold with the dry combustion preventing temperature threshold of cooking utensils.

7. The control method of claim 6, wherein obtaining the corresponding alarm time threshold and the dry-burning prevention temperature threshold of the cooker according to the current firepower of the cooker and the thermal conductivity of the pot comprises:

if yes, obtaining a second dry burning prevention temperature value and a second alarm time value according to the current firepower of the cooker and the heat conductivity of the cooker, and setting the second dry burning prevention temperature value as a dry burning prevention temperature threshold value of the cooker and setting the second alarm time value as an alarm time threshold value of the cooker;

8. The control method according to claim 1, characterized by comprising:

9. The control method according to claim 1, characterized by comprising:

receiving an alarm termination instruction;

10. An anti-dry burning system, which is characterized by comprising a cooker and a control device, wherein the control device is connected with the cooker and is used for realizing the steps of the control method of any one of claims 1 to 9.