CN113531618A - Control method of range hood - Google Patents

Control method of range hood Download PDF

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Publication number
CN113531618A
CN113531618A CN202110816369.XA CN202110816369A CN113531618A CN 113531618 A CN113531618 A CN 113531618A CN 202110816369 A CN202110816369 A CN 202110816369A CN 113531618 A CN113531618 A CN 113531618A
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oil smoke
fan
value
range hood
data set
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CN113531618B (en
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林枝堂
潘叶江
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Vatti Co Ltd
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Vatti Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24CDOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00Details
    • F24C15/20Removing cooking fumes
    • F24C15/2021Arrangement or mounting of control or safety systems

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  • Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

The embodiment of the invention discloses a control method of a range hood, which comprises the following steps: s1, powering on the range hood; s2, acquiring an oil smoke data set; s3, calculating mutation amplitude H according to the oil smoke data set, determining whether the oil smoke data mutates at least according to the oil smoke data set and a preset value, and adding 1 to mutation frequency F if the oil smoke data mutates; s4, judging whether the mutation frequency F is larger than or equal to a first threshold value Fs or whether the mutation amplitude H is larger than or equal to a second threshold value Hs; s5, if F is less than Fs and H is less than Hs, the extractor hood maintains the current state and returns to the step S2; s6, if F is more than or equal to Fs or H is more than or equal to Hs, executing the air quantity gear adjusting strategy. According to the method, through counting the mutation times F and the mutation amplitude H, whether the air quantity gear adjusting strategy needs to be executed or not is determined reliably and quickly, and therefore the phenomenon that the air quantity gear is switched frequently can be avoided.

Description

Control method of range hood
Technical Field
The embodiment of the invention relates to the technical field of range hoods, in particular to a control method of a range hood.
Background
When the food materials are fried in cooking, the food materials are in a dry-fire state, and the air quantity gear is switched, the smoke concentration value can be rapidly changed, and the smoke concentration value is quite unstable. When the smoke concentration value is unstable, the fluctuation and the amplitude of the smoke concentration value are changed, and if the collected smoke concentration value is simply used for judging whether to switch the air volume gear, the phenomenon of frequently switching the air volume gear is generated.
Disclosure of Invention
The embodiment of the invention aims to solve at least one of the problems in the prior art to a certain extent, and therefore, the embodiment of the invention provides a control method of a range hood, which can not only obviously improve the response speed, but also reliably and quickly determine whether an air quantity gear adjusting strategy needs to be executed, so that the phenomenon of frequently switching air quantity gears can be avoided.
According to the control method of the range hood, the control method is realized through the following technical scheme:
a control method of a range hood comprises the following steps:
s1, powering on the range hood;
s2, acquiring a lampblack data set, wherein the lampblack data comprises lampblack temperature and/or lampblack concentration;
s3, calculating mutation amplitude H according to the oil smoke data set, determining whether the oil smoke data mutates at least according to the oil smoke data set and a preset value, and adding 1 to mutation frequency F if the oil smoke data mutates;
s4, judging whether the mutation frequency F is larger than or equal to a first threshold value Fs or whether the mutation amplitude H is larger than or equal to a second threshold value Hs;
s5, if the mutation frequency F is less than the first threshold value Fs and the mutation amplitude H is less than the second threshold value Hs, the range hood maintains the current state and returns to the step S2;
s6, if the mutation frequency F is larger than or equal to the first threshold value Fs or the mutation amplitude H is larger than or equal to the second threshold value Hs, executing an air volume gear adjusting strategy.
In some embodiments, the amplitude of the sudden change H is calculated from the soot data set, specifically: and extracting the maximum value and the minimum value in the oil smoke data group, and calculating the difference value between the maximum value and the minimum value, wherein the difference value forms the mutation amplitude H.
In some embodiments, the predetermined value is a first predetermined value, and the determining whether the fume data has a sudden change according to at least the fume data set and the predetermined value includes:
s311, calculating a variance according to the oil smoke data set;
s312, judging whether the variance is larger than or equal to a first preset value, if so, determining that the oil smoke data mutates, and if not, determining that the oil smoke data does not mutate.
In some embodiments, the preset value is a second preset value, and the determining whether the lampblack data has a sudden change according to at least the lampblack data set and the preset value includes:
s321, calculating a standard deviation according to the oil smoke data set;
and S322, judging whether the standard deviation is greater than or equal to a second preset value, if so, determining that the oil smoke data mutates, and if not, determining that the oil smoke data does not mutate.
In some embodiments, the lampblack data set is composed of a plurality of cumulatively collected lampblack data values, and each lampblack data value is collected at intervals Δ t by a lampblack detection module.
In some embodiments, the executing the air volume gear adjustment strategy specifically includes: judging whether the fan of the range hood is started, if not, starting the fan, and then returning to the step S2; and if the fan is started, adjusting the air volume gear of the fan.
In some embodiments, the adjusting the air volume gear of the fan includes:
s61, acquiring real-time oil smoke parameter values, and calculating an oil smoke average value according to the latest acquired oil smoke data set;
s62, judging whether the real-time oil smoke parameter value is larger than the oil smoke average value;
s63, if the real-time oil smoke parameter value is larger than the average value of the oil smoke, the air quantity gear of the fan is increased, and then the step S2 is returned;
s64, if the real-time oil smoke parameter value is equal to the average value of the oil smoke, controlling the fan to work according to the current air volume gear, and then returning to the step S2;
and S65, if the real-time oil smoke parameter value is smaller than the average value of the oil smoke, the air volume gear of the fan is lowered, and then the step S2 is returned.
In some embodiments, the air quantity gear of the fan is increased by first determining whether the current air quantity gear of the fan is at the highest air quantity gear, if so, controlling the fan to continue to operate at the highest air quantity gear, and otherwise, increasing the air quantity gear of the fan.
In some embodiments, the wind volume gear of the fan is adjusted down by first determining whether the current wind volume gear of the fan is at the lowest wind volume gear, if so, controlling the fan to continue to operate at the low wind volume gear, and otherwise, adjusting down the wind volume gear of the fan.
In some embodiments, before returning to step S2, it is determined whether the total collection duration t of the lampblack data values is greater than or equal to a preset time period, if yes, the mutation number F and the zero clearing are performed, and then the step S2 is returned to; if not, the step S2 is directly returned to.
Compared with the prior art, the embodiment of the invention at least comprises the following beneficial effects:
1. according to the control method, the mutation times F are counted at least according to the oil smoke data group and the preset value, and the reliability of determining whether the air quantity gear adjusting strategy needs to be executed or not can be effectively ensured according to the comparison result of the mutation times F and the first threshold value Fs;
2. calculating the sudden change amplitude H according to the oil fume data set, and remarkably improving the response speed for determining whether the air quantity gear adjustment strategy needs to be executed or not according to the comparison result of the sudden change amplitude H and a second threshold value Hs;
3. by counting the mutation times F and the mutation amplitude H, whether the air quantity gear adjusting strategy needs to be executed or not is reliably and quickly determined, so that the phenomenon that the air quantity gears are frequently switched can be avoided.
Drawings
FIG. 1 is a flowchart of a control method in embodiment 1 of the invention;
fig. 2 is a connection block diagram of the range hood in embodiment 1 of the present invention;
fig. 3 is a flowchart of adjusting the air volume gear of the fan in embodiment 2 of the present invention;
fig. 4 is a connection block diagram of the range hood in embodiment 3 of the present invention.
Detailed Description
The following examples are illustrative of the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the invention or equivalent replacements of parts of technical features without departing from the spirit of the embodiments of the invention are intended to be covered by the scope of the claims of the embodiments of the invention.
Example 1
As shown in fig. 1-2, this embodiment provides a control method of a range hood, where the range hood includes a control module 1, an oil smoke detection module 2, a timing module 3, a counting module 4, and a fan 5, the oil smoke detection module 2 is configured to detect an oil smoke data value of an area where the range hood is located in real time, where the oil smoke data value includes an oil smoke temperature value and/or an oil smoke concentration value, the timing module 3 is at least configured to record a total acquisition duration of the oil smoke data value, the counting module 4 is configured to record a mutation frequency F of an occurrence mutation of the oil smoke data, and the control module 1 is electrically connected to the oil smoke detection module 2, the timing module 3, the counting module 4, and the fan 5, respectively. The control method comprises the following steps:
s1, powering on the range hood;
specifically, after the range hood is powered on, the parameters are initialized to avoid that the data prestored in the control module 1 before the power-on affects the accuracy of the following data.
S2, acquiring a lampblack data set, wherein the lampblack data comprises lampblack temperature and/or lampblack concentration;
specifically, the oil smoke data value is collected through the oil smoke detection module 2, and an oil smoke data set can be obtained according to the accumulated collected oil smoke data value. Meanwhile, the timing module 3 starts to record the total acquisition duration of the oil smoke data value, so that before the total acquisition duration is greater than or equal to the preset time period, the control module 1 can accurately identify whether the air volume gear adjustment strategy needs to be executed.
S3, calculating mutation amplitude H according to the oil smoke data set, determining whether the oil smoke data mutates at least according to the oil smoke data set and a preset value, and adding 1 to mutation frequency F if the oil smoke data mutates;
specifically, the oil smoke data set calculates the mutation amplitude H, specifically: the controller module 1 extracts the maximum value and the minimum value in the oil smoke data group, calculates the difference between the maximum value and the minimum value, and the difference constitutes the sudden change amplitude H, that is, the sudden change amplitude H is the maximum value-the minimum value, so that whether the oil smoke data in the data group change rapidly or not can be accurately identified according to the sudden change amplitude H counted by the oil smoke data group.
The preset value is a first preset value or a second preset value. The method for determining whether the oil smoke data are mutated or not at least according to the oil smoke data group and a preset value specifically comprises the following steps: according to the oil smoke data set, the control module 1 calculates the variance or standard deviation of the oil smoke data set, and according to the comparison result of the variance and the first preset value or the standard deviation and the second preset value, the control module 1 can determine whether the oil smoke data in the oil smoke data set are suddenly changed, so that whether the oil smoke data in the data set are rapidly changed can be accurately identified.
When the control module 1 determines that the sudden change occurs, the counting module 4 counts by adding 1, namely adding 1 to the sudden change frequency F, which indicates that the oil smoke data of the range hood in the area is rapidly changed.
S4, judging whether the mutation frequency F is larger than or equal to a first threshold value Fs or whether the mutation amplitude H is larger than or equal to a second threshold value Hs;
s5, if the mutation frequency F is less than the first threshold value Fs and the mutation amplitude H is less than the second threshold value Hs, the range hood maintains the current state and returns to the step S2;
s6, if the mutation frequency F is larger than or equal to the first threshold value Fs or the mutation amplitude H is larger than or equal to the second threshold value Hs, executing an air volume gear adjusting strategy.
Therefore, the control method of the embodiment can effectively ensure the reliability of determining whether to execute the air volume gear adjustment strategy or not by counting the mutation times F at least according to the oil smoke data set and the preset value and according to the comparison result of the mutation times F and the first threshold value Fs. And calculating the sudden change amplitude H according to the oil smoke data set, and remarkably improving the response speed for determining whether the air quantity gear adjustment strategy needs to be executed according to the comparison result of the sudden change amplitude H and the second threshold Hs. Therefore, by counting the mutation times F and the mutation amplitude H, whether the air quantity gear adjusting strategy needs to be executed or not is reliably and quickly determined, and the phenomenon that the air quantity gear is frequently switched can be avoided.
Preferably, in this embodiment, taking the example that the oil smoke data includes the oil smoke concentration, the oil smoke detection module 2 is configured to detect the oil smoke concentration value of the area where the range hood is located in real time. In step S2, the acquiring of the oil smoke data set acquires oil smoke data at intervals of Δ t through the oil smoke detection module 2, and transmits the acquired oil smoke data to the control module 1, and when the oil smoke detection module 2 acquires a plurality of oil smoke data values in an accumulated manner, the acquiring of the oil smoke data set is performed, and the oil smoke data set is composed of a plurality of oil smoke data values acquired in an accumulated manner.
Preferably, in step S3, the determining whether the fume data has a sudden change according to at least the fume data set and a preset value includes any one of the following two ways.
The first mode is as follows: when the preset value is a first preset value, determining whether the lampblack data are mutated at least according to the lampblack data group and the preset value, wherein the step comprises the following steps: s311, the control module 1 calculates variance according to the oil smoke data set; s312, judging whether the variance is larger than or equal to a first preset value, if so, determining that the oil smoke data mutates, and if not, determining that the oil smoke data does not mutate.
The second mode is as follows: when the preset value is a second preset value, determining whether the lampblack data are mutated at least according to the lampblack data group and the preset value, wherein the step comprises the following steps: s321, calculating a standard deviation by the control module 1 according to the oil smoke data set; and S322, judging whether the standard deviation is greater than or equal to a second preset value, if so, determining that the oil smoke data mutates, and if not, determining that the oil smoke data does not mutate.
More preferably, in order to further improve the detection and statistical accuracy of the number of mutations F in step S3, before calculating the variance or standard deviation, the minimum value and the maximum value in the soot data set are removed to obtain a calculation array, and then the variance or standard deviation is calculated according to the calculation array.
Preferably, in step S5, before returning to step S2, it is determined whether the total collection duration of the soot data values is greater than or equal to a preset time period, and if the total collection duration is greater than or equal to the preset time period, the number of mutations F is cleared and the total collection duration recorded by the timer module 3 is cleared, and then the process returns to step S2. If the total acquisition duration is less than the preset time period, the process returns directly to step S2. Therefore, in the preset time period, whether the air quantity gear adjustment strategy needs to be executed in the preset time period can be accurately identified by counting the mutation times F and the mutation amplitude H, and when the strategy does not need to be executed, the mutation times F and the recorded total acquisition duration are reset, so that the condition that the detection accuracy and reliability of the next preset time period are influenced by the statistical data of the current preset time period can be avoided.
Example 2
The present embodiment is different from embodiment 1 in that the present embodiment further includes a specific step of executing an air volume gear adjustment strategy. The executing air quantity gear adjusting strategy specifically comprises the following steps: judging whether the fan of the range hood is started, if not, starting the fan, and then returning to the step S2; and if the fan is started, adjusting the air volume gear of the fan. From this, when confirming the demand and carrying out amount of wind gear adjustment strategy, control the fan and start when the fan does not start, realized opening of automatic control fan, improve intelligent degree, liberation user's both hands promote user and use experience. The air quantity gear of the fan is adjusted when the fan is started, so that the air quantity gear of the fan is dynamically updated, the air quantity gear of the range hood is guaranteed to be matched with oil smoke data of an area where the range hood is located, and the smoke gathering effect is improved.
As shown in fig. 3, preferably, the adjusting the air volume gear of the blower specifically includes:
s61, acquiring real-time oil smoke parameter values, and calculating an oil smoke average value according to the latest acquired oil smoke data set;
specifically, the oil smoke detection module 2 collects oil smoke parameter values of the area where the range hood is located, and calculates an oil smoke average value of the latest oil smoke data set according to the acquired latest oil smoke data set.
In this embodiment, the real-time lampblack parameter value is used as the last subdata in the latest lampblack data set, i.e. the real-time lampblack parameter value belongs to the latest lampblack data set. Before calculating the average value of the oil smoke in the latest oil smoke data group, whether the maximum value and the minimum value in the latest oil smoke data group are removed or not can be determined according to requirements.
S62, judging whether the real-time oil smoke parameter value is larger than the oil smoke average value;
s63, if the real-time oil smoke parameter value is larger than the average value of the oil smoke, the air quantity gear of the fan is increased, and then the step S2 is returned;
s64, if the real-time oil smoke parameter value is equal to the average value of the oil smoke, controlling the fan to work according to the current air volume gear, and then returning to the step S2;
and S65, if the real-time oil smoke parameter value is smaller than the average value of the oil smoke, the air volume gear of the fan is lowered, and then the step S2 is returned.
Therefore, the average value of the oil smoke is calculated according to the latest acquired oil smoke data set, and the average value of the oil smoke is used as a judgment basis, so that the judgment basis is dynamically acquired, a judgment standard value does not need to be prestored in advance, and the intelligent control degree of the product is further improved. In addition, according to the comparison result of the real-time oil fume parameter value acquired in real time and the calculated oil fume average value, how to adjust the air quantity gear of the fan 5 can be accurately identified, and the accuracy and the reliability of adjusting the air quantity gear of the fan 5 are obviously improved.
Preferably, the air quantity gear of the blower is increased by firstly judging whether the current air quantity gear of the blower is in the highest air quantity gear, if so, controlling the blower to continuously work according to the highest air quantity gear, otherwise, increasing the air quantity gear of the blower, thus avoiding redundant gear shifting when the blower is in the highest air quantity gear, and when the blower is not in the highest air quantity gear, further improving the smoking effect by improving the air quantity gear of the blower.
Preferably, the air quantity gear of the fan is adjusted down, whether the current air quantity gear of the fan is in the lowest air quantity gear is judged firstly, if so, the fan is controlled to continue working according to the low and high air quantity gear, otherwise, the air quantity gear of the fan is adjusted down, so that redundant gear adjusting actions can be avoided when the fan is in the lowest air quantity gear, and when the fan is not in the lowest air quantity gear, the air quantity gear of the fan is adjusted down, so that the smoking effect can be guaranteed, and meanwhile, the energy consumption is saved.
Preferably, in steps S63 to S65, before returning to step S2, it is determined whether the total collection duration of the lampblack data values is greater than or equal to a preset time period, if the total collection duration is greater than or equal to the preset time period, the mutation number F and the total collection duration recorded by the timing module 3 are both cleared, and then the step S2 is returned to; if the total acquisition duration is less than the preset time period, the process returns directly to step S2. Therefore, in the preset time period, whether the air quantity gear adjustment strategy needs to be executed in the preset time period can be accurately identified by counting the mutation times F and the mutation amplitude H, and when the strategy does not need to be executed, the mutation times F and the recorded total acquisition duration are reset, so that the condition that the detection accuracy and reliability of the next preset time period are influenced by the statistical data of the current preset time period can be avoided.
Example 3
The difference between the present embodiment and embodiment 2 is that the range hood has a different structure and control method. As shown in fig. 4, the range hood of this embodiment may further include an auxiliary fan 6 electrically connected to the control module 1, where the auxiliary fan 6 is used to assist in promoting the smoke gathering effect, so as to further promote the smoking effect and further reduce the escape of oil smoke.
Preferably, in step S63, the increasing the wind volume gear of the fan, and then returning to step S2, specifically includes:
s631, judging whether the current air volume gear of the fan is the highest air volume gear or not, and judging whether the auxiliary fan 6 is started or not;
s632, if the fan is not at the highest air volume gear and the auxiliary fan 6 is not started, increasing the air volume gear of the fan, and then returning to the step S2;
s633, if the fan is in the highest air volume gear and the auxiliary fan 6 is not started, the control module 1 controls the auxiliary fan 6 to start, and then the step S2 is returned;
and S634, if the fan is in the highest air volume gear and the auxiliary fan 6 is started, controlling the fan and the auxiliary fan 6 to maintain the current working state, and then returning to the step S2.
Therefore, when the smoke concentration value is rapidly changed and violent and the fan is in the highest air quantity gear, the auxiliary fan 6 is started, so that the smoking effect can be further improved.
Preferably, in step S65, the wind volume gear of the fan is turned down, and then the process returns to step S2, which specifically includes:
s651, determining whether the auxiliary blower 6 is turned on, turning off the auxiliary blower 6 if the auxiliary blower 6 is turned on, and then returning to step S2; if the auxiliary fan 6 is not started, the next step is carried out;
and S652, judging whether the current air volume gear of the fan is in the lowest air volume gear, if so, controlling the fan to continuously work according to the low and high air volume gears, and otherwise, reducing the air volume gear of the fan.
Therefore, when the smoke concentration value is not changed greatly, the energy consumption is saved while the smoking effect is ensured by closing the auxiliary fan 6 or closing the auxiliary fan 6 and reducing the air quantity gear of the fan.
What has been described above are merely some implementations of embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept of the embodiments of the present invention, which fall within the scope of the embodiments of the invention.

Claims (10)

1. A control method of a range hood is characterized by comprising the following steps:
s1, powering on the range hood;
s2, acquiring a lampblack data set, wherein the lampblack data comprises lampblack temperature and/or lampblack concentration;
s3, calculating mutation amplitude H according to the oil smoke data set, determining whether the oil smoke data mutates at least according to the oil smoke data set and a preset value, and adding 1 to mutation frequency F if the oil smoke data mutates;
s4, judging whether the mutation frequency F is larger than or equal to a first threshold value Fs or whether the mutation amplitude H is larger than or equal to a second threshold value Hs;
s5, if the mutation frequency F is less than the first threshold value Fs and the mutation amplitude H is less than the second threshold value Hs, the range hood maintains the current state and returns to the step S2;
s6, if the mutation frequency F is larger than or equal to the first threshold value Fs or the mutation amplitude H is larger than or equal to the second threshold value Hs, executing an air volume gear adjusting strategy.
2. The control method of a range hood according to claim 1, wherein the step amplitude H is calculated according to the oil smoke data set, specifically: and extracting the maximum value and the minimum value in the oil smoke data group, and calculating the difference value between the maximum value and the minimum value, wherein the difference value forms the mutation amplitude H.
3. The control method of a range hood according to claim 1, wherein the preset value is a first preset value, and the determining whether the fume data has a sudden change according to at least the fume data set and the preset value comprises:
s311, calculating a variance according to the oil smoke data set;
s312, judging whether the variance is larger than or equal to a first preset value, if so, determining that the oil smoke data mutates, and if not, determining that the oil smoke data does not mutate.
4. The control method of a range hood according to claim 1, wherein the predetermined value is a second predetermined value, and the determining whether the fume data has a sudden change according to at least the fume data set and the predetermined value comprises:
s321, calculating a standard deviation according to the oil smoke data set;
and S322, judging whether the standard deviation is greater than or equal to a second preset value, if so, determining that the oil smoke data mutates, and if not, determining that the oil smoke data does not mutate.
5. The control method of a range hood according to claim 1, wherein the oil smoke data set is composed of a plurality of oil smoke data values collected cumulatively, and each of the oil smoke data values is collected at intervals Δ t by an oil smoke detection module.
6. The control method of the range hood according to claim 1, wherein the executing of the air volume gear adjustment strategy specifically comprises: judging whether the fan of the range hood is started, if not, starting the fan, and then returning to the step S2; and if the fan is started, adjusting the air volume gear of the fan.
7. The control method of the range hood according to claim 6, wherein the adjusting of the air volume gear of the fan comprises:
s61, acquiring real-time oil smoke parameter values, and calculating an oil smoke average value according to the latest acquired oil smoke data set;
s62, judging whether the real-time oil smoke parameter value is larger than the oil smoke average value;
s63, if the real-time oil smoke parameter value is larger than the average value of the oil smoke, the air quantity gear of the fan is increased, and then the step S2 is returned;
s64, if the real-time oil smoke parameter value is equal to the average value of the oil smoke, controlling the fan to work according to the current air volume gear, and then returning to the step S2;
and S65, if the real-time oil smoke parameter value is smaller than the average value of the oil smoke, the air volume gear of the fan is lowered, and then the step S2 is returned.
8. The control method of the range hood according to claim 7, wherein the increase of the air volume gear of the fan is performed by first determining whether the current air volume gear of the fan is at the highest air volume gear, if so, controlling the fan to continue to operate at the highest air volume gear, and otherwise, increasing the air volume gear of the fan.
9. The control method of the range hood according to claim 7, wherein the wind volume gear of the fan is turned down by first determining whether the current wind volume gear of the fan is at the lowest wind volume gear, if so, controlling the fan to continue to operate at the low wind volume gear, and if not, turning down the wind volume gear of the fan.
10. The control method of a range hood according to any one of claims 1 or 6-9, wherein before returning to step S2, it is determined whether the total collection duration t of soot data values is greater than or equal to a preset time period, if yes, the mutation number F and the zero clearing are performed, and then returning to step S2; if not, the step S2 is directly returned to.
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN116147040A (en) * 2023-04-17 2023-05-23 杭州老板电器股份有限公司 Air valve control method and system of variable-frequency range hood

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