Range hood control method

Abstract

The invention relates to the technical field of kitchen ventilators, and discloses a kitchen ventilator control method which comprises the following steps: detecting the temperature of a kitchen range area in real time; identifying whether a sudden heat source exists in the stove area or not based on the temperature change of the stove area temperature at the adjacent detection moments; if it is identified that the sudden heat source exists in the stove area, determining a first stove temperature change trend in a first preset duration based on a plurality of stove area temperatures detected in the first preset duration; if the first stove temperature change trend shows that the temperature of the stove area is in the rising trend, the range hood is controlled to start a draught fan. Therefore, the sudden heat source can be quickly sensed when the sudden heat source exists in the stove area, and the response speed is high; further judging whether the temperature change of the kitchen range area caused by the sudden heat source continuously rises or not according to the first kitchen range temperature change trend, and controlling the range hood to start the fan when the first kitchen range temperature change trend shows that the temperature of the kitchen range area is in the rising trend, so that interference of other heat sources is eliminated, and false triggering of the range hood is avoided while the starting speed of the range hood is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and particularly to a range hood control method. Background Art

[0002] For a range hood with a temperature-sensing linkage function, it mainly calculates the difference between the temperature of the cooking device and the ambient temperature to identify whether the cooking device is fired, and thus controls whether the range hood is turned on based on this. In this solution, the cooking temperature is easily affected by other temperatures such as the human body temperature, hot water, and the temperature brought by sunlight irradiation, resulting in problems such as mis-triggering of the range hood device, and the anti-mis-triggering ability is weak.

[0003] In response to this, in the related art, the slope of the temperature change of the cooking device is collected, and whether the cooking device is fired is identified according to the slope of the temperature change to avoid misjudgment caused by other temperatures. However, in this solution, it is easy to cause the range hood to start slowly or even unable to start the range hood normally due to slope mismatch. Therefore, how to reasonably and effectively control the range hood device with a temperature-sensing linkage function has become an urgent technical problem to be solved. Summary of the Invention

[0004] The first technical problem solved by the present invention is to provide a range hood control method, which effectively solves the problem that the current range hood control scheme cannot balance the start-up speed and anti-mis-triggering.

[0005] The above first technical problem is solved by the following technical solutions:

[0006] A range hood control method, the method includes:

[0007] Real-time detect the temperature of the cooking area;

[0008] Based on the temperature change of the cooking area temperature at adjacent detection times, identify whether there is a sudden heat source in the cooking area;

[0009] If it is identified that there is a sudden heat source in the cooking area, then based on multiple cooking area temperatures detected within a first preset duration, determine the first stove temperature change trend within the first preset duration;

[0010] If the first stove temperature change trend shows that the cooking area temperature shows an upward trend, then control the range hood to start the blower.

[0011] Compared with the background art, the beneficial effects of the range hood control method of the present invention are as follows: By the temperature change of the stove area at adjacent detection times, it is identified whether there is a sudden heat source in the stove area, so that when there is a sudden heat source in the stove area, the existing sudden heat source can be quickly sensed, and the response speed is fast; in the case where there is a sudden heat source in the stove area, based on the multiple stove area temperatures detected within the first preset duration, the first stove temperature change trend within the first preset duration is determined, so as to further judge whether the temperature change of the stove area caused by the sudden heat source is continuously rising, and when the first stove temperature change trend shows that the temperature of the stove area shows an upward trend, the range hood is controlled to start the fan, thereby excluding the interference of other heat sources, and thus avoiding false triggering of the range hood while ensuring the starting speed of the range hood.

[0012] In one embodiment, determining the first stove temperature change trend within the first preset duration based on the multiple stove area temperatures detected within the first preset duration includes:

[0013] Based on the temperature changes of the stove area temperatures at all adjacent detection times within the first preset duration, determine the stove temperature change index within the first preset duration;

[0014] Based on the temperature change of the stove area temperature at the last detection time relative to the first detection time within the first preset duration, determine the first stove temperature change value within the first preset duration;

[0015] If the stove temperature change index within the first preset duration reaches the preset threshold, and the first stove temperature change value shows that the temperature rises and the rising value reaches the first temperature change threshold, then it is determined that the first stove temperature change trend shows that the temperature of the stove area shows an upward trend.

[0016] In one embodiment, determining the first stove temperature change trend within the first preset duration based on the multiple stove area temperatures detected within the first preset duration includes:

[0017] Based on the temperature changes of the stove area temperatures at all adjacent detection times within the first preset duration, determine the stove temperature change index within the first preset duration;

[0018] Based on the temperature change of the stove area temperature at the last detection time relative to the first detection time within the first preset duration, determine the first stove temperature change value within the first preset duration;

[0019] Based on the temperature change of the ambient temperature at the last detection time relative to the first detection time within the first preset duration, determine the first ambient temperature change value within the first preset duration, where the ambient temperature is obtained by real-time detection;

[0020] If the stove temperature change index reaches a preset threshold within the first preset duration, and the first stove temperature change value shows that the temperature rises and the rising value reaches the first temperature change threshold or the first ambient temperature change value shows that the temperature rises and the rising value reaches the second temperature change threshold, then it is determined that the first stove temperature change trend shows that the temperature in the stove area presents an upward trend.

[0021] In one embodiment, determining the stove temperature change index within the first preset duration based on the temperature changes of the stove area temperature at all adjacent detection moments within the first preset duration includes:

[0022] If the temperature change of the stove area temperature at adjacent detection moments within the first preset duration shows that the temperature rises or is stable, then increase the stove temperature change index by a first preset value;

[0023] If the temperature change of the stove area temperature at adjacent detection moments within the first preset duration shows that the temperature drops and the dropping value does not reach the third temperature change threshold, then decrease the stove temperature change index by a second preset value.

[0024] In one embodiment, the method further includes:

[0025] If the temperature change of the stove area temperature at adjacent detection moments within the first preset duration shows that the temperature drops and the dropping value reaches the third temperature change threshold, then re-identify whether there is a sudden heat source in the stove area based on the temperature change of the stove area temperature at adjacent detection moments.

[0026] In one embodiment, after identifying whether there is a sudden heat source in the stove area, the method further includes:

[0027] If it is identified that there is a sudden heat source in the stove area, then within the second preset duration, determine the second stove temperature change trend within the second preset duration based on the stove area temperature detected at the current detection moment and the stove area temperature at the first detection moment within the second preset duration;

[0028] If the second stove temperature change trend shows that the temperature in the stove area presents an upward trend, then control the range hood to start the fan, where the second preset duration is greater than the first preset duration.

[0029] In one embodiment, after identifying whether there is a sudden heat source in the stove area, the method further includes:

[0030] If it is identified that there is a sudden heat source in the stove area, then within the second preset duration, determine the second stove temperature change trend within the second preset duration based on the stove area temperature detected at the current detection moment and the stove area temperature at the first detection moment within the second preset duration;

[0031] Determine the second ambient temperature change trend within the second preset duration based on the ambient temperature detected at the current detection moment and the ambient temperature at the first detection moment within the second preset duration;

[0032] If the second stove temperature change trend shows that the temperature in the stove area is on the rise, or the second ambient temperature change trend shows that the ambient temperature is on the rise, then control the range hood to start the blower, where the second preset duration is greater than the first preset duration.

[0033] In one embodiment, determining the second stove temperature change trend within the second preset duration based on the temperature in the stove area detected at the current detection moment and the temperature in the stove area at the first detection moment within the second preset duration includes:

[0034] Determine the second stove temperature change value within the second preset duration based on the temperature change of the temperature in the stove area detected at the current detection moment relative to the temperature in the stove area at the first detection moment within the second preset duration;

[0035] If the second stove temperature change value shows that the temperature is rising and the rising value reaches the fourth temperature change threshold, then determine that the second stove temperature change trend shows that the temperature in the stove area is on the rise;

[0036] If the second stove temperature change value shows that the temperature is falling and the falling value reaches the fifth temperature change threshold, then determine that the second stove temperature change trend shows that the temperature in the stove area is on the decline, where the fifth temperature change threshold is not less than the fourth temperature change threshold.

[0037] In one embodiment, after determining the second stove temperature change trend within the second preset duration based on the temperature in the stove area detected within the second preset duration, the method further includes:

[0038] If the second stove temperature change trend shows that the temperature in the stove area is on the decline, then re-identify whether there is a sudden heat source in the stove area based on the temperature change of the temperature in the stove area at adjacent detection moments.

[0039] In one embodiment, after controlling the range hood to start the blower, the method further includes:

[0040] In response to the stop work instruction, control the blower to stop rotating, pause identifying whether there is a sudden heat source in the stove area, and determine the third stove temperature change trend after the range hood is turned off based on the temperature in the stove area detected in real time;

[0041] When the third stove temperature change trend shows that the temperature in the stove area is on the decline, time the third preset duration;

[0042] After the third preset duration, re-identify whether there is a sudden heat source in the stove area based on the temperature change of the temperature in the stove area at adjacent detection moments.

[0043] In one embodiment, based on the temperature of the cooking appliance area detected in real time, determining a third cooking appliance temperature change trend after the range hood is turned off, includes:

[0044] If the temperature change of the cooking appliance area at continuously preset adjacent detection times shows a temperature decrease and the decrease value reaches a sixth temperature change threshold, or there is a temperature change of the cooking appliance area at adjacent detection times that shows a temperature decrease and the decrease value reaches a seventh temperature change threshold, then it is determined that the third cooking appliance temperature change trend shows that the temperature of the cooking appliance area shows a downward trend;

[0045] Wherein, the seventh temperature change threshold is not less than the sixth temperature change threshold.

[0046] In one embodiment, based on the temperature change of the cooking appliance area at adjacent detection times, identifying whether there is a sudden heat source in the cooking appliance area, includes:

[0047] Detecting the ambient temperature in real time;

[0048] Based on the ambient temperature, determining a heat source temperature change threshold;

[0049] If the temperature change of the cooking appliance area at adjacent detection times shows a temperature increase reaching the heat source temperature change threshold, then it is determined that there is a sudden heat source in the cooking appliance area. Brief Description of the Drawings

[0050] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0051] Figure 1 is a schematic flowchart of a range hood control method according to an embodiment of the present invention;

[0052] Figure 2 is a schematic flowchart of determining a first cooking appliance temperature change trend in a range hood control method according to an embodiment of the present invention;

[0053] Figure 3 is a schematic flowchart of determining a first cooking appliance temperature change trend in a range hood control method according to an embodiment of the present invention;

[0054] Figure 4 is a schematic flowchart of another range hood control method according to an embodiment of the present invention;

[0055] Figure 5 is a schematic flowchart of another range hood control method according to an embodiment of the present invention;

[0056] Figure 6 It is a schematic flowchart after the range hood stops working in a range hood control method according to an embodiment of the present invention. Specific embodiments

[0057] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0058] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0059] For a range hood with a temperature-sensing linkage function, it mainly calculates the difference between the temperature of the cooking device and the ambient temperature to identify whether the cooking device is ignited, and thereby controls whether the range hood is turned on based on this. In this solution, the cooking temperature is easily affected by other temperatures such as the human body temperature, hot water, and the temperature brought by sunlight irradiation, resulting in problems such as mis-triggering of the range hood device, and the anti-mis-triggering ability is weak. In response to this, in the related art, the slope of the temperature change of the cooking device is collected, and whether the cooking device is ignited is identified according to the slope of the temperature change to avoid misjudgment caused by other temperatures. However, in this solution, it is easy to cause the range hood to start up slowly due to slope mismatch, and even the range hood cannot be started normally.

[0060] In order to solve the problem that the current range hood control scheme cannot balance the start-up speed and anti-mis-triggering, the present invention provides a range hood control method. This method identifies whether there is a sudden heat source in the cooking area through the temperature change of the cooking area temperature at adjacent detection times, so that it can quickly sense the existing sudden heat source when there is a sudden heat source in the cooking area, and the response speed is fast; in the case where there is a sudden heat source in the cooking area, based on the multiple cooking area temperatures detected within the first preset duration, the first stove temperature change trend within the first preset duration is determined, so as to further judge whether the temperature change in the cooking area caused by the sudden heat source is continuously rising, and when the first stove temperature change trend shows that the cooking area temperature shows an upward trend, the range hood is controlled to start the fan, thereby excluding the interference of other heat sources, and thus avoiding mis-triggering of the range hood while ensuring the start-up speed of the range hood.

[0061] The smoke machine control method provided by the embodiments of the present invention can be applied to a smoke machine control system. The smoke machine control system includes an infrared temperature probe, and the infrared temperature probe has a cold end and a hot end. Among them, the cold end is used to detect the ambient temperature of the smoke machine, and the hot end is used to detect the temperature of the stove area corresponding to the smoke machine.

[0062] The following combines Figures 1 to 6 , and describes the embodiments of the present invention.

[0063] According to an embodiment of the present invention, a smoke machine control method is provided. Figure 1 It is a schematic flowchart of a smoke machine control method according to an embodiment of the present invention. As Figure 1 shown, the method may include the following steps:

[0064] Step 110: Detect the temperature of the stove area in real time.

[0065] In the embodiments of the present invention, in the smoke machine control system, the hot end of the infrared temperature probe detects the temperature of the stove area corresponding to the smoke machine in real time to identify the temperature of the stove area. Among them, the detection of the temperature of the stove area can be implemented according to a set temperature detection period.

[0066] Step 120: Based on the temperature change of the stove area temperature at adjacent detection times, identify whether there is a sudden heat source in the stove area.

[0067] In the embodiments of the present invention, the temperature change of the stove area temperature at adjacent detection times refers to the temperature change value of the stove area temperature at the latter detection time compared with the stove area temperature at the previous detection time. If the temperature change value reaches the set heat source temperature change threshold, it can be determined that the temperature of the stove area has suddenly risen, and at this time, there is a sudden heat source in the stove area; if the temperature change value does not reach the set heat source temperature change threshold, it can be determined that the temperature of the stove area has not risen, and at this time, there is no sudden heat source in the stove area.

[0068] In one embodiment, in order to eliminate the influence of the ambient temperature on the temperature change of the stove area, when identifying whether there is a sudden heat source in the stove area, the heat source temperature change threshold is determined based on the ambient temperature; among them, the heat source temperature change threshold is used to judge whether there is a sudden heat source in the stove area. Specifically, the ambient temperature is detected in real time; based on the ambient temperature, the heat source temperature change threshold is determined; if the temperature change of the stove area temperature at adjacent detection times shows that the temperature rise reaches the heat source temperature change threshold, it is determined that there is a sudden heat source in the stove area.

[0069] Among them, based on the ambient temperature, a heat source temperature change threshold is determined. Specifically, on the basis of a preset heat source temperature change threshold, a correction value corresponding to the ambient temperature is superimposed to correct the preset heat source temperature change threshold pair. There is a mapping relationship between the ambient temperature range where the ambient temperature is located and the correction value, which can be specifically shown in Table 1 below. Considering that the ambient temperature will inhibit the temperature rise in the cooking appliance area when the ambient temperature is relatively high and relatively low, a lower correction value is adopted when the ambient temperature is relatively high and relatively low to appropriately reduce the determination condition for identifying that there is a sudden heat source in the cooking appliance area, making it more in line with the temperature change law, thereby improving the determination of the existence of a sudden heat source in the cooking appliance area to be more accurate.

[0070] Table 1

[0071] Ambient temperature T T<20 20≤T<25 25≤T<40 40≤T<50 T≥50 Correction value k k＝0 k＝1 k＝2 k＝1 k＝0

[0072] Step 130: If it is recognized that there is a sudden heat source in the cooking appliance area, then based on the multiple cooking appliance area temperatures detected within the first preset duration, determine the first stove temperature change trend within the first preset duration.

[0073] In the embodiment of the present invention, after it is recognized that there is a sudden heat source in the cooking appliance area, it is further confirmed whether the sudden heat source in the cooking appliance area is a cooking device to exclude the temperature interference caused by other heat sources and avoid the mis-triggering of the range hood. Specifically, within the first preset duration starting from the recognition of the existence of a sudden heat source in the cooking appliance area, according to the multiple cooking appliance area temperatures detected in real time, determine the first stove temperature change trend within the first preset duration. It should be noted that the starting point of time of the first preset duration is the time point when the existence of a sudden heat source in the cooking appliance area is recognized.

[0074] Among them, the first stove temperature change trend represents the overall temperature change trend of the cooking appliance area within the first preset duration; if the overall temperature change direction of the multiple cooking appliance area temperatures detected within the first preset duration is upward, it indicates that the first stove temperature change trend shows that the temperature in the cooking appliance area presents an upward trend; specifically, for the judgment method of the overall temperature change direction, for example, the slope of the curve fitted according to the multiple cooking appliance area temperatures is greater than zero, and the temperature difference between the cooking appliance area temperatures at adjacent detection times among the multiple cooking appliance area temperatures generally shows a temperature increase, etc., which are not specifically limited here.

[0075] Step 140: If the first stove temperature change trend shows that the temperature in the cooking appliance area presents an upward trend, then control the range hood to start the fan.

[0076] In the embodiment of the present invention, if the first stove temperature change trend shows that the temperature in the cooking appliance area presents an upward trend, it indicates that the current temperature in the cooking appliance area is rising steadily, and it can be determined that the sudden heat source in the current recognized cooking appliance area is a cooking device, and the current temperature rise in the cooking appliance area is caused by the use of the cooking device. Therefore, control the range hood to start the fan.

[0077] In one embodiment, in order to accurately determine the temperature change trend in the cooking appliance area within the first preset duration, the first stove temperature change trend may be determined by combining the continuous change of the temperature in the cooking appliance area detected within the first preset duration and the overall change of the temperature in the cooking appliance area within the first preset duration. Specifically, Figure 2 FIG. is a schematic flowchart of determining the first stove temperature change trend in a smoke machine control method according to an embodiment of the present invention. As Figure 2 shown, the above step 130 may include the following steps:

[0078] Step 210: Determine the stove temperature change index within the first preset duration based on the temperature changes of the temperature in the cooking appliance area at all adjacent detection times within the first preset duration.

[0079] In an embodiment of the present invention, the stove temperature change index is used to characterize the tendency of the temperature in the cooking appliance area to change in the positive direction within the first preset duration, and is determined according to the temperature changes of the temperature in the cooking appliance area at all adjacent detection times within the first preset duration to reflect the continuous change of the temperature in the cooking appliance area within the first preset duration.

[0080] In one embodiment, the stove temperature change index may be specifically calculated by weighted calculation in the following manner:

[0081] If the temperature change of the temperature in the cooking appliance area at adjacent detection times within the first preset duration shows a temperature rise or temperature stability, the stove temperature change index is increased by a first preset value. Among them, if the temperature change value of the temperature in the cooking appliance area at adjacent detection times, that is, the temperature difference between the temperature in the cooking appliance area at the later detection time and the temperature in the cooking appliance area at the previous detection time, is greater than or equal to zero, it indicates that the temperature change of the temperature in the cooking appliance area at adjacent detection times shows a temperature rise or temperature stability.

[0082] If the temperature change of the temperature in the cooking appliance area at adjacent detection times within the first preset duration shows a temperature drop and the drop value does not reach the third temperature change threshold, the stove temperature change index is decreased by a second preset value. Among them, if the temperature change value of the temperature in the cooking appliance area at adjacent detection times is less than zero, it indicates that the temperature change of the temperature in the cooking appliance area at adjacent detection times shows a temperature drop, and at the same time, if the absolute value of the temperature change value does not reach the third temperature change threshold, it indicates that the drop value does not reach the third temperature change threshold.

[0083] Step 220: Determine the first stove temperature change value within the first preset duration based on the temperature change of the temperature in the cooking appliance area at the last detection time relative to the first detection time within the first preset duration.

[0084] In an embodiment of the present invention, the first stove temperature change value is used to characterize the overall temperature change of the stove area within the first preset duration. The temperature difference between the stove area temperature at the last detection moment and the first detection moment within the first preset duration is determined as the first stove temperature change value.

[0085] Step 230: If the stove temperature change index within the first preset duration reaches the preset threshold, and the first stove temperature change value shows that the temperature rises and the rising value reaches the first temperature change threshold, it is determined that the first stove temperature change trend shows that the temperature of the stove area shows an upward trend.

[0086] In an embodiment of the present invention, if the stove temperature change index within the first preset duration reaches the preset threshold, it indicates that the temperature of the stove area is generally on an upward trend within the first preset duration; if the first stove temperature change value shows that the temperature rises and the rising value reaches the first temperature change threshold, that is, the first stove temperature change value is greater than zero and reaches the first temperature change threshold, it indicates that the temperature of the stove area rises as a whole within the first preset duration. When both conditions are met, it can be determined that the first stove temperature change trend shows that the temperature of the stove area shows an upward trend.

[0087] In one embodiment, in order to avoid inaccurate temperature detection of the stove area by the infrared temperature probe, the change of the ambient temperature can be used to assist in judging the overall temperature change within the first preset duration; correspondingly, Figure 3 is a schematic flowchart of determining the first stove temperature change trend in a smoke machine control method according to an embodiment of the present invention, as Figure 3 shown, the above 130 may include the following steps:

[0088] Step 310: Based on the temperature change of the stove area temperature at all adjacent detection moments within the first preset duration, determine the stove temperature change index within the first preset duration. For details, reference can be made to Figure 2 step 210 of the embodiment shown, which will not be elaborated here.

[0089] Step 320: Based on the temperature change of the stove area temperature at the last detection moment relative to the first detection moment within the first preset duration, determine the first stove temperature change value within the first preset duration. For details, reference can be made to Figure 2 step 220 of the embodiment shown, which will not be elaborated here.

[0090] Step 330: Based on the temperature change of the ambient temperature at the last detection moment relative to the first detection moment within the first preset duration, determine the first ambient temperature change value within the first preset duration.

[0091] In an embodiment of the present invention, the ambient temperature is obtained by real-time detection, and it is detected in real time together with the temperature in the cooking appliance area according to a set temperature detection period. The first ambient temperature change value is used to characterize the overall temperature change of the ambient temperature within a first preset duration. The temperature difference between the ambient temperature at the last detection moment and the ambient temperature at the first detection moment within the first preset duration is determined as the first ambient temperature change value.

[0092] Step 340: If the stove temperature change index reaches a preset threshold within the first preset duration, and the first stove temperature change value shows that the temperature rises and the rising value reaches the first temperature change threshold or the first ambient temperature change value shows that the temperature rises and the rising value reaches the second temperature change threshold, then it is determined that the first stove temperature change trend shows that the temperature in the cooking appliance area presents an upward trend.

[0093] In an embodiment of the present invention, if the stove temperature change index reaches a preset threshold within the first preset duration, it indicates that the temperature in the cooking appliance area is generally on an upward trend within the first preset duration; if the first stove temperature change value shows that the temperature rises and the rising value reaches the first temperature change threshold, that is, the first stove temperature change value is greater than zero and reaches the first temperature change threshold, it indicates that the temperature in the cooking appliance area rises as a whole within the first preset duration; if the first ambient temperature change value shows that the temperature rises and the rising value reaches the second temperature change threshold, that is, the first ambient temperature change value is greater than zero and reaches the second temperature change threshold, it indicates that the ambient temperature rises as a whole within the first preset duration. When any one of the temperature change values among the stove temperature change index, the first stove temperature change value, and the first ambient temperature change value satisfies the condition, and both conditions are satisfied, it can be determined that the first stove temperature change trend shows that the temperature in the cooking appliance area presents an upward trend.

[0094] In an embodiment, if the temperature change of the temperature in the cooking appliance area between adjacent detection moments within the first preset duration shows a temperature drop and the drop value reaches the third temperature change threshold, it indicates that the temperature rise in the cooking appliance area is not continuous and is caused by interference from other heat sources. Therefore, based on the temperature change of the temperature in the cooking appliance area between adjacent detection moments, whether there is a sudden heat source in the cooking appliance area is re-identified.

[0095] In an embodiment, the method of determining the change trend of the temperature in the cooking appliance area within the first preset duration to determine whether to control the smoke machine to turn on the fan mainly aims at the situation where the temperature rises rapidly in a short time. For the situation where the temperature in the cooking appliance area rises slowly, the following method can be used for judgment and control. It should be noted that in the actual control process, the following embodiments and the above embodiments are actually executed in parallel to accurately judge and control the smoke machine under different temperature change conditions.

[0096] Specifically, Figure 4 is a schematic flowchart of another smoke machine control method according to an embodiment of the present invention, as Figure 4As shown, after identifying whether there is a sudden heat source in the cooking appliance area in the above step 120, the method further includes:

[0097] Step 410: If it is identified that there is a sudden heat source in the cooking appliance area, then within a second preset duration, based on the temperature of the cooking appliance area detected at the current detection moment and the temperature of the cooking appliance area at the first detection moment within the second preset duration, determine the second stove temperature change trend within the second preset duration.

[0098] In an embodiment of the present invention, after identifying that there is a sudden heat source in the cooking appliance area, it is further confirmed whether the sudden heat source in the cooking appliance area is a cooking device, so as to exclude the temperature interference caused by other heat sources and avoid the mis-triggering of the range hood. Specifically, within the second preset duration starting from the identification of the sudden heat source in the cooking appliance area, according to the temperature of the cooking appliance area detected at the current detection moment and the temperature of the cooking appliance area at the first detection moment within the second preset duration, determine the second stove temperature change trend within the second preset duration. Among them, the second preset duration is greater than the first preset duration. It should be noted that the starting time point of the second preset duration is the time point when the sudden heat source in the cooking appliance area is identified, that is, the starting time points of the first preset duration and the second preset duration are the same; the first detection moment within the second preset duration is also the time point when the sudden heat source in the cooking appliance area is identified.

[0099] In one embodiment, based on the temperature change of the temperature of the cooking appliance area detected at the current detection moment relative to the temperature of the cooking appliance area at the first detection moment within the second preset duration, determine the second stove temperature change value; that is, take the temperature difference between the temperature of the cooking appliance area detected at the current detection moment and the temperature of the cooking appliance area at the first detection moment as the second stove temperature change value. If the second stove temperature change value shows a temperature increase and the increase value reaches the fourth temperature change threshold, it indicates that the temperature in the current cooking appliance area has risen to a level that can exclude the interference of other heat sources, so it is determined that the second stove temperature change trend shows that the temperature in the cooking appliance area shows an upward trend; if the second stove temperature change value shows a temperature decrease and the decrease value reaches the fifth temperature change threshold, it indicates that the temperature in the cooking appliance area has dropped suddenly, so it is determined that the second stove temperature change trend shows that the temperature in the cooking appliance area shows a downward trend, where the fifth temperature change threshold is not less than the fourth temperature change threshold.

[0100] In one embodiment, within the second preset duration, it is also possible to detect in real time the temperature change between the temperatures of the stove area at adjacent detection moments, determine whether the temperature change between the temperatures of the stove area at adjacent detection moments shows a temperature drop, and the drop value reaches the temperature drop threshold, so as to judge whether the temperature of the stove area has a sudden drop; if the temperature change between the temperatures of the stove area at adjacent detection moments shows a temperature drop and the drop value reaches the temperature drop threshold, it can be determined that the second stove temperature change trend shows that the temperature of the stove area shows a downward trend. Among them, since it is to judge the temperature change between the temperatures of the stove area at adjacent detection moments, the temperature drop threshold can be less than the fifth temperature change threshold but not less than the fourth temperature change threshold.

[0101] Step 420: If the second stove temperature change trend shows that the temperature of the stove area shows an upward trend, control the range hood to start the blower.

[0102] In the embodiment of the present invention, if the second stove temperature change trend shows that the temperature of the stove area shows an upward trend, it can be determined that the sudden heat source in the currently identified stove area is a cooking device, and the current increase in the temperature of the stove area is caused by the use of the cooking device. Therefore, control the range hood to start the blower.

[0103] In one embodiment, in order to avoid inaccurate temperature detection of the stove area by the infrared temperature probe, the change in the ambient temperature can be used to assist in judging the current temperature change situation within the second preset duration; correspondingly, Figure 5 is a schematic flowchart of another range hood control method according to an embodiment of the present invention. As Figure 5 shown, after identifying whether there is a sudden heat source in the stove area in the above step 120, the method further includes:

[0104] Step 510: If it is identified that there is a sudden heat source in the stove area, within the second preset duration, based on the temperature of the stove area detected at the current detection moment and the temperature of the stove area at the first detection moment within the second preset duration, determine the second stove temperature change trend within the second preset duration. For details, reference can be made to Figure 4 the steps of the embodiment shown in

[0105] Step 520: Based on the ambient temperature detected at the current detection moment and the ambient temperature at the first detection moment within the second preset duration, determine the second ambient temperature change trend within the second preset duration.

[0106] In an embodiment of the present invention, the temperature difference between the ambient temperature detected at the current detection moment and the ambient temperature at the first detection moment within the second preset duration is determined as the second ambient temperature change value, and the second ambient temperature change trend within the second preset duration is determined based on the second ambient temperature change value. Among them, if the second ambient temperature change value shows a temperature increase and the increase value reaches the fourth temperature change threshold, it indicates that the second ambient temperature change trend shows an upward trend of the ambient temperature.

[0107] Step 530: If the second stove temperature change trend shows an upward trend of the temperature in the stove area, or the second ambient temperature change trend shows an upward trend of the ambient temperature, then control the range hood to start the fan.

[0108] In an embodiment of the present invention, if the second stove temperature change trend shows an upward trend of the temperature in the stove area, or the second ambient temperature change trend shows an upward trend of the ambient temperature, it can be determined that the sudden heat source in the stove area currently identified is a cooking device, and the increase in the current stove area temperature is caused by the use of the cooking device. Therefore, control the range hood to start the fan.

[0109] In one embodiment, if the second stove temperature change trend shows a downward trend of the temperature in the stove area, it indicates that the increase in the temperature in the stove area is not continuous and is caused by interference from other heat sources. Therefore, based on the temperature change of the stove area temperature at adjacent detection moments, re-identify whether there is a sudden heat source in the stove area. Similarly, if within the second preset duration, neither the second stove temperature change trend nor the second ambient temperature change trend meets the conditions in the above Figure 4 or Figure 5 shown embodiments, that is, the second stove temperature change trend always shows a downward trend and the second ambient temperature change trend always shows a downward trend, then based on the temperature change of the stove area temperature at adjacent detection moments, re-identify whether there is a sudden heat source in the stove area.

[0110] In one embodiment, after controlling the range hood to start the fan, in order to avoid the residual temperature of the cooking device accidentally triggering the range hood to start after the cooking device has been used for a long time, after the range hood stops working, the range hood pauses to identify whether there is a sudden heat source in the stove area. Specifically, Figure 6 is a schematic flowchart of the process after the range hood stops working in a range hood control method according to an embodiment of the present invention. As Figure 6 shown, after controlling the range hood to start the fan, it may further include:

[0111] Step 610: In response to the stop work instruction, control the fan to stop rotating, pause to identify whether there is a sudden heat source in the stove area, and determine the third stove temperature change trend after the range hood is turned off based on the real-time detected stove area temperature.

[0112] In an embodiment of the present invention, in response to an instruction to stop working, the range hood stops working, and the fan is controlled to stop rotating. At the same time, due to the operation of the cooking equipment, there is a heat source in the stove area, so the identification of whether there is a sudden heat source in the stove area is suspended to avoid false triggering of the range hood, and based on the real-time detected stove area temperature, the third stove temperature change trend after the range hood is turned off is determined to determine the timing to re-identify the presence of a sudden heat source in the stove area.

[0113] In one embodiment, if the temperature change of the stove area temperature at a preset number of consecutive adjacent detection moments shows that the temperature is decreasing and the decrease value reaches a sixth temperature change threshold, or the temperature change of the stove area temperature at adjacent detection moments shows that the temperature is decreasing and the decrease value reaches a seventh temperature change threshold, it is determined that the third stove temperature change trend shows that the stove area temperature presents a decreasing trend; wherein the seventh temperature change threshold is not less than the sixth temperature change threshold.

[0114] Step 620: When the third stove temperature variation trend shows that the temperature of the stove area presents a downward trend, count the third preset time.

[0115] In the embodiment of the present invention, if the third stove temperature change trend shows that the temperature of the stove area is showing a downward trend, it means that the residual temperature of the stove area is dissipating. Therefore, the third preset time duration is counted to reserve time for the temperature of the stove area to drop, to ensure that when re-identifying whether there is a sudden heat source in the stove area, it will not be falsely triggered due to the residual temperature still existing in the stove area.

[0116] Step 630: after the third preset time period, based on the temperature change of the stove area at adjacent detection moments, re-identify whether there is a sudden heat source in the stove area.

[0117] In a specific embodiment, in the above embodiment, the temperature detection period for the stove area temperature and the ambient temperature can be set to 2s, and accordingly, the first preset time length is set to 6s, the second preset time length is set to 40s, and the third preset time length is set to 1min.

[0118] In a specific embodiment, the first temperature change threshold can be set to 1°C, the second temperature change threshold can be set to 1°C, the third temperature change threshold can be set to 1°C, the fourth temperature change threshold can be set to 2°C, the fifth temperature change threshold can be set to 5°C, the sixth temperature change threshold can be set to 1°C, and the seventh temperature change threshold can be set to 5°C.

[0119] The smoke machine control method provided by the embodiment of the present invention identifies whether there is a sudden heat source in the stove area through the temperature change of the stove area temperature at adjacent detection times, so that it can quickly sense the existing sudden heat source when there is a sudden heat source in the stove area, and the response speed is fast; in the case where there is a sudden heat source in the stove area, based on the multiple stove area temperatures detected within the first preset duration, the first stove temperature change trend within the first preset duration is determined, so as to further judge whether the temperature change of the stove area caused by the sudden heat source is continuously rising, and when the first stove temperature change trend shows that the stove area temperature shows an upward trend, the smoke machine is controlled to start the fan, so as to exclude the interference of other heat sources, thereby avoiding false triggering of the smoke machine while ensuring the startup speed of the smoke machine.

[0120] In the specific content of the above specific implementation manner, each technical feature can be combined arbitrarily without contradiction. For the sake of concise description, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features does not exist in contradiction, it should be considered as the scope recorded in this specification.

[0121] The specific content of the above specific implementation manner only expresses several implementation manners of the present invention, and its description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A control method for a range hood, characterized in that, The method includes: Real-time detecting the temperature of the cooking range area; Based on the temperature change of the cooking range area at adjacent detection times, identifying whether there is a sudden heat source in the cooking range area; If it is identified that there is a sudden heat source in the cooking range area, then based on multiple temperatures of the cooking range area detected within a first preset duration, determining the first stove temperature change trend within the first preset duration; If the first stove temperature change trend shows that the temperature of the cooking range area shows an upward trend, then controlling the range hood to start the blower.

2. The method according to claim 1, wherein The determining the first stove temperature change trend within the first preset duration based on multiple temperatures of the cooking range area detected within the first preset duration includes: Based on the temperature change of the cooking range area at all adjacent detection times within the first preset duration, determining the stove temperature change index within the first preset duration; Based on the temperature change of the cooking range area at the last detection time relative to the first detection time within the first preset duration, determining the first stove temperature change value within the first preset duration; If the stove temperature change index within the first preset duration reaches a preset threshold, and the first stove temperature change value shows that the temperature rises and the rising value reaches the first temperature change threshold, then determining that the first stove temperature change trend shows that the temperature of the cooking range area shows an upward trend.

3. The method according to claim 1, wherein The determining the first stove temperature change trend within the first preset duration based on multiple temperatures of the cooking range area detected within the first preset duration includes: Based on the temperature change of the cooking range area at all adjacent detection times within the first preset duration, determining the stove temperature change index within the first preset duration; Based on the temperature change of the cooking range area at the last detection time relative to the first detection time within the first preset duration, determining the first stove temperature change value within the first preset duration; Based on the temperature change of the ambient temperature at the last detection time relative to the first detection time within the first preset duration, determining the first ambient temperature change value within the first preset duration, where the ambient temperature is obtained by real-time detection; If the stove temperature change index within the first preset duration reaches a preset threshold, and the first stove temperature change value shows that the temperature rises and the rising value reaches the first temperature change threshold or the first ambient temperature change value shows that the temperature rises and the rising value reaches the second temperature change threshold, then determining that the first stove temperature change trend shows that the temperature of the cooking range area shows an upward trend.

4. The method according to claim 2 or 3, characterized in that, The determining the stove temperature change index within the first preset duration based on the temperature change of the cooking range area at all adjacent detection times within the first preset duration includes: If the temperature change of the cooking range area at adjacent detection times within the first preset duration shows that the temperature rises or is stable, then increasing the stove temperature change index by a first preset value; If the temperature change of the cooking range area at adjacent detection times within the first preset duration shows that the temperature drops and the dropping value does not reach the third temperature change threshold, then decreasing the stove temperature change index by a second preset value.

5. The method according to claim 4, characterized in that, The method further includes: If the temperature change of the stove area temperature at adjacent detection times within the first preset duration shows a temperature drop and the drop value reaches the third temperature change threshold, then based on the temperature change of the stove area temperature at adjacent detection times, re-identify whether there is a sudden heat source in the stove area.

6. The method according to claim 1, wherein After identifying whether there is a sudden heat source in the stove area, the method further includes: If it is identified that there is a sudden heat source in the stove area, then within a second preset duration, based on the stove area temperature detected at the current detection time and the stove area temperature at the first detection time within the second preset duration, determine the second stove temperature change trend within the second preset duration; If the second stove temperature change trend shows that the stove area temperature is on the rise, then control the range hood to start the blower, where the second preset duration is greater than the first preset duration.

7. The method according to claim 1, wherein After identifying whether there is a sudden heat source in the stove area, the method further includes: If it is identified that there is a sudden heat source in the stove area, then within a second preset duration, based on the stove area temperature detected at the current detection time and the stove area temperature at the first detection time within the second preset duration, determine the second stove temperature change trend within the second preset duration; Based on the ambient temperature detected at the current detection time and the ambient temperature at the first detection time within the second preset duration, determine the second ambient temperature change trend within the second preset duration; If the second stove temperature change trend shows that the stove area temperature is on the rise, or the second ambient temperature change trend shows that the ambient temperature is on the rise, then control the range hood to start the blower, where the second preset duration is greater than the first preset duration.

8. The method according to claim 6 or 7, characterized in that, The determining the second stove temperature change trend within the second preset duration based on the stove area temperature detected at the current detection time and the stove area temperature at the first detection time within the second preset duration includes: Based on the temperature change of the stove area temperature detected at the current detection time relative to the stove area temperature at the first detection time within the second preset duration, determine the second stove temperature change value within the second preset duration; If the second stove temperature change value shows a temperature rise and the rise value reaches the fourth temperature change threshold, then determine that the second stove temperature change trend shows that the stove area temperature is on the rise; If the second stove temperature change value shows a temperature drop and the drop value reaches the fifth temperature change threshold, then determine that the second stove temperature change trend shows that the stove area temperature is on the decline, where the fifth temperature change threshold is not less than the fourth temperature change threshold.

9. The method according to claim 8, wherein After determining the second stove temperature change trend within the second preset duration based on the stove area temperature detected within the second preset duration, the method further includes: If the second stove temperature change trend shows that the stove area temperature is on the decline, then based on the temperature change of the stove area temperature at adjacent detection times, re-identify whether there is a sudden heat source in the stove area.

10. The method according to claim 1, characterized in that After controlling the range hood to start the blower, the method further includes: In response to an instruction to stop working, control the blower to stop rotating, pause identifying whether there is a sudden heat source in the cooktop area, and determine the third cooktop temperature change trend after the range hood shuts down based on the temperature of the cooktop area detected in real time; When the third cooktop temperature change trend shows that the temperature of the cooktop area is decreasing, time the third preset duration; After the third preset duration, re-identify whether there is a sudden heat source in the cooktop area based on the temperature change of the cooktop area at adjacent detection times.

11. The method according to claim 10, wherein The determining the third cooktop temperature change trend after the range hood shuts down based on the temperature of the cooktop area detected in real time includes: If the temperature change of the cooktop area at a continuous preset number of adjacent detection times shows that the temperature is decreasing and the decrease value reaches the sixth temperature change threshold, or there is a temperature change of the cooktop area at adjacent detection times that shows that the temperature is decreasing and the decrease value reaches the seventh temperature change threshold, then determine that the third cooktop temperature change trend shows that the temperature of the cooktop area is decreasing; Wherein, the seventh temperature change threshold is not less than the sixth temperature change threshold.

12. The method according to claim 1, wherein The identifying whether there is a sudden heat source in the cooktop area based on the temperature change of the cooktop area at adjacent detection times includes: Detect the ambient temperature in real time; Determine the heat source temperature change threshold based on the ambient temperature; If the temperature change of the cooktop area at adjacent detection times shows that the temperature is rising to reach the heat source temperature change threshold, then determine that there is a sudden heat source in the cooktop area.

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