CN114704861A - Control method and device of range hood and range hood - Google Patents

Control method and device of range hood and range hood Download PDF

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Publication number
CN114704861A
CN114704861A CN202210316829.7A CN202210316829A CN114704861A CN 114704861 A CN114704861 A CN 114704861A CN 202210316829 A CN202210316829 A CN 202210316829A CN 114704861 A CN114704861 A CN 114704861A
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China
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concentration
concentration difference
oil smoke
range hood
variation
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Chinese (zh)
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卢宇聪
符海毅
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Guangdong Wanhe Thermal Energy Technology Co Ltd
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Guangdong Wanhe Thermal Energy Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2021—Arrangement 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 application relates to a control method and device of a range hood and the range hood. The control method of the range hood comprises the following steps: acquiring the concentration difference of a first detection period of the range hood in the operation process, wherein the concentration difference is the difference value of the first oil smoke concentration and the second oil smoke concentration; determining the concentration difference variation of the first detection period, wherein the concentration difference variation is the difference between the concentration difference of the range hood in the first detection period and the concentration difference of the second detection period, and the second detection period is before the first detection period; and controlling the rotating speed of a fan of the range hood according to the concentration difference variation of the first detection period. The invention can reduce the occurrence of the situation of misinformation of the oil smoke concentration, thereby ensuring the oil smoke suction effect of the range hood when the oil smoke concentration changes, matching the suction force of the range hood with the current oil smoke concentration and improving the intelligent degree of the oil smoke suction function of the range hood.

Description

Control method and device of range hood and range hood
Technical Field
The application relates to the technical field of control of range hoods, in particular to a control method and a control device for a range hood and the range hood.
Background
Range hoods have remained a fast development in recent years. The range hood with intelligence among them becomes a concern that consumers are more and more favored. At present, the intelligent range hood capable of automatically sensing the oil smoke concentration and adjusting the wind power is rapidly increased in the market, and the intelligent requirements of consumers are met.
At present, the range hood mainly has two kinds to the response mode of oil smoke. One is to place the oil smoke induction device around the kitchen range, through the concentration and the scope of induction kitchen range annex oil smoke, send concentration information to the cigarette machine, through with the fixed concentration benchmark value that presets come the size of judgement oil smoke concentration this moment. The other is to place the oil smoke sensing device under the wind wheel, send the concentration information to the cigarette machine by sensing the concentration of the sucked oil smoke, and judge the oil smoke concentration at the moment by the preset fixed concentration reference value.
The two oil smoke sensing modes are easy to cause the condition of inaccurate judgment of the oil smoke concentration, so that the detected oil smoke concentration is not matched with the oil smoke suction capacity of the range hood.
Disclosure of Invention
Accordingly, it is necessary to provide a control method and device for a range hood and a range hood, which can solve the problem that the detected oil smoke concentration is not matched with the oil smoke suction capability of the range hood, in view of the above technical problems.
The first technical problem to be solved by the invention is to provide a control method of a range hood, which can effectively reduce the occurrence of misinformation of oil smoke concentration, so that the current oil smoke concentration and the suction force of a fan can be matched with each other, and the intelligence degree of the smoking function of the range hood is improved.
The second technical problem to be solved by the invention is to provide a control device of a range hood, which can effectively reduce the occurrence of misinformation of oil smoke concentration, so that the current oil smoke concentration and the suction force of a fan can be matched with each other, and the intelligence degree of the smoking function of the range hood is improved.
The third technical problem to be solved by the invention is to provide a range hood, which can effectively reduce the occurrence of misinformation of oil smoke concentration, so that the current oil smoke concentration and the suction force of a fan can be matched with each other, and the intelligence degree of the smoking function of the range hood is improved.
The first technical problem is solved by the following technical scheme:
a control method of a range hood comprises the following steps:
acquiring a concentration difference of a first detection period of the range hood in the operation process, wherein the concentration difference is a difference value between a first oil smoke concentration and a second oil smoke concentration; the first oil smoke concentration is the oil smoke concentration detected by a first oil smoke detection device, and the second oil smoke concentration is the oil smoke concentration detected by a second oil smoke detection device, wherein the first oil smoke detection device is arranged at an air inlet of the range hood, and the second oil smoke detection device is arranged at an air outlet of the range hood;
determining the concentration difference variation of a first detection period, wherein the concentration difference variation is the difference between the concentration difference of the range hood in the first detection period and the concentration difference of a second detection period, and the second detection period is before the first detection period;
and controlling the rotating speed of a fan of the range hood according to the concentration difference variation of the first detection period.
Compared with the background technology, the control method of the range hood of the invention has the following beneficial effects: the oil smoke concentration difference is acquired in real time, the concentration difference of the last detection period is used as the reference value of the next detection period to determine the concentration difference change condition of the current detection period, the change condition of the oil smoke concentration can be reflected more intuitively and accurately, the condition of misinformation of the oil smoke concentration can be reduced, and when the oil smoke concentration changes, the oil smoke absorption effect of the range hood is favorably ensured, the suction force of the range hood is matched with the current oil smoke concentration, the use requirement of a user is met, and the intelligence degree of the smoking function of the range hood is improved.
In one embodiment, the concentration difference of the first detection cycle includes concentration differences at a plurality of times, and the determining the concentration difference change amount of the first detection cycle includes:
respectively calculating the difference between the concentration difference at each moment and the concentration difference in the second detection period to obtain the concentration difference variation at each moment;
an average value of the concentration difference change amounts is determined from the concentration difference change amount at each time, and the average value of the concentration difference change amounts is determined as the concentration difference change amount of the first detection period.
In one embodiment, the controlling the fan speed of the range hood according to the concentration difference variation of the first detection period includes:
determining the variation trend of the concentration difference variation according to the concentration difference variation of the first detection period and the concentration difference variation of the historical detection period; the concentration difference variation of the historical detection period is the concentration difference variation of N continuous detection periods before the first detection period, wherein N is a positive integer;
and controlling the rotating speed of the fan of the range hood according to the variation trend of the concentration difference variation.
In one embodiment, the change trend of the concentration difference change amount comprises a linear increasing change, a linear decreasing change and a stable state maintaining state; the controlling the rotating speed of the fan of the range hood according to the variation trend of the concentration difference variation comprises the following steps:
if the variation trend of the concentration difference variation is linear incremental variation, the rotating speed of a fan of the range hood is increased;
if the variation trend of the concentration difference variation is linear decreasing variation, reducing or maintaining the rotating speed of the fan of the range hood;
and if the variation trend of the concentration difference variation is constant, maintaining the rotating speed of the fan of the range hood.
In one embodiment, the variation trend of the concentration difference variation includes a non-linear variation, and the controlling the fan speed of the range hood according to the variation trend of the concentration difference variation includes:
and if the variation trend of the concentration difference variation is nonlinear variation, controlling the rotating speed of the fan of the range hood according to the average value of the concentration difference variation of the historical detection period and the concentration difference variation of the first detection period.
In one embodiment, the controlling the fan speed of the range hood according to the average value of the concentration difference variation of the historical detection periods and the concentration difference variation of the first detection period includes:
if the concentration difference variation of the first detection period is larger than the average value of the concentration difference variations, the rotating speed of a fan of the range hood is increased;
if the concentration difference variation of the first detection period is smaller than the average value of the concentration difference variations, reducing or maintaining the rotating speed of a fan of the range hood;
and if the concentration difference variation of the first detection period is equal to the average value of the concentration difference variations, maintaining the rotating speed of the fan of the range hood.
In one embodiment, if the first detection period is an initial detection period, the concentration difference of the second detection period is an initial reference value; the control method further comprises the following steps:
acquiring a first initial oil smoke concentration and a second initial oil smoke concentration of the range hood at a starting stage; the first initial oil smoke concentration is obtained by detecting through the first oil smoke detection device, and the second initial oil smoke concentration is obtained by detecting through the second oil smoke detection device;
and determining the initial reference value according to the concentration difference between the first initial oil smoke concentration and the second initial oil smoke concentration.
In one embodiment, the first initial oil smoke concentration and the second initial oil smoke concentration of the range hood in the start-up phase include first initial oil smoke concentration and second initial oil smoke concentration at a plurality of moments in the start-up phase, and the determining the initial reference value according to the concentration difference between the first initial oil smoke concentration and the second initial oil smoke concentration includes:
respectively calculating the concentration difference between the first initial oil smoke concentration and the second initial oil smoke concentration at each moment to obtain the concentration difference at each moment;
and calculating a concentration difference average value according to the concentration difference at each moment, and taking the concentration difference average value as the initial reference value.
The second technical problem is solved by the following technical solutions:
a control device for a range hood, comprising:
the concentration difference acquisition module is used for acquiring the concentration difference of the range hood in a first detection period in the operation process, wherein the concentration difference is the difference value of the first oil smoke concentration and the second oil smoke concentration; the first oil smoke concentration is the oil smoke concentration detected by a first oil smoke detection device, and the second oil smoke concentration is the oil smoke concentration detected by a second oil smoke detection device, wherein the first oil smoke detection device is arranged at an air inlet of the range hood, and the second oil smoke detection device is arranged at an air outlet of the range hood;
the concentration difference variation determining module is used for determining the concentration difference variation of a first detection period, wherein the concentration difference variation is the difference value between the concentration difference of the range hood in the first detection period and the concentration difference of the range hood in a second detection period; the second detection period precedes the first detection period;
and the control module is used for controlling the rotating speed of the fan of the range hood according to the concentration difference variation of the first detection period.
The third technical problem is solved by the following technical scheme:
the utility model provides a range hood, includes air intake and air outlet, and wherein, range hood still includes:
a fan;
the first oil smoke detection device is arranged at the air inlet and used for acquiring first oil smoke concentration;
the second oil smoke detection device is arranged at the air outlet and used for acquiring a second oil smoke concentration;
a controller comprising a memory and a processor, the memory storing a computer program which when executed by the processor implements the steps of the method of any of the above embodiments.
It can be understood that the beneficial effects that the control device of the range hood according to the second aspect and the range hood according to the third aspect can achieve can be referred to the foregoing upgrading method of the smart home device according to the first aspect and the beneficial effects in any one of the embodiments, which are not described herein again.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the description of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the description below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic flow chart illustrating a control method of a range hood according to an embodiment;
fig. 2 is a schematic flow chart of a control method of the range hood in another embodiment;
fig. 3 is a change curve of the oil smoke concentration obtained by the range hood in the prior art;
FIG. 4 is a graph showing the change of suction force of a range hood according to the prior art;
FIG. 5 is a graph showing the variation of the concentration of soot at the inlet of the range hood;
FIG. 6 is a graph showing the variation of the concentration of soot at the outlet of the range hood in one embodiment;
FIG. 7 is a graph showing a variation of a difference between oil smoke concentrations at an air inlet and an air outlet of the range hood according to an embodiment;
FIG. 8 is a graph showing the variation of the suction force of the range hood according to one embodiment;
FIG. 9 is a schematic structural diagram of a range hood according to an embodiment;
fig. 10 is a schematic structural diagram of a range hood in another embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It is to be understood that the terms "first", "second", and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of technical features being indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. The terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. Further, in the description of the present application, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In the description of the present application, "a plurality" means at least one, e.g., one, two, etc., unless explicitly specified otherwise.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
In one embodiment, as shown in fig. 1, a method for controlling a range hood is provided, and the method includes steps S100 to S400.
Step S100, acquiring a concentration difference of a first detection period in the operation process of the range hood, wherein the concentration difference is a difference value between a first oil smoke concentration and a second oil smoke concentration; the first oil smoke concentration is the oil smoke concentration detected by the first oil smoke detection device, and the second oil smoke concentration is the oil smoke concentration detected by the second oil smoke detection device, wherein the first oil smoke detection device is arranged at an air inlet of the range hood, and the second oil smoke detection device is arranged at an air outlet of the range hood.
The first oil smoke detection device is arranged at the air inlet of the range hood, and the second oil smoke detection device is arranged at the air outlet of the range hood. The first oil smoke concentration of the air inlet and the second oil smoke concentration of the air outlet are respectively obtained through the two oil smoke detection devices in the operation process of the range hood, and the concentration difference between the first oil smoke concentration and the second oil smoke concentration is calculated. There is an interval time between each detection cycle, that is, the acquisition of concentration data of one detection cycle is performed at intervals of a period of time. For example, every 5min or 10 min. Every detection cycle can acquire oil smoke concentration once and also can acquire oil smoke concentration many times, and the first oil smoke concentration and the second oil smoke concentration are all acquired at the same moment every time, for example, every detection cycle acquires 3-6 times of oil smoke concentration.
Step S200, determining the concentration difference variation of the first detection period, wherein the concentration difference variation is the difference between the concentration difference of the range hood in the first detection period and the concentration difference of the second detection period, and the second detection period is before the first detection period.
In one embodiment, the second detection period is a previous detection period of the first detection period, or may be several previous detection periods. And calculating the difference between the first oil smoke concentration and the second oil smoke concentration acquired in the first detection period to obtain the concentration difference of the first detection period. And calculating the difference between the concentration difference of the first detection period and the concentration difference of the second detection period to obtain the concentration difference variation of the first detection period, so that the reference value of the concentration difference of each period is the concentration difference of the previous period, and the variation condition of the oil smoke concentration and the oil smoke suction capability of the range hood can be reflected more visually. The concentration difference of the first detection period may be a concentration difference at one moment or a concentration difference at multiple moments, that is, each detection period may acquire one lampblack concentration data or multiple lampblack concentration data.
And step S300, controlling the rotating speed of a fan of the range hood according to the concentration difference variation of the first detection period.
Specifically, the rotation speed of the fan is controlled, that is, the oil smoke absorption capacity of the range hood is controlled, the oil smoke absorption capacity is strong when the rotation speed of the fan is fast, and the oil smoke absorption capacity is weak when the rotation speed of the fan is slow. And controlling a fan of the range hood according to the concentration difference variation of the first detection period to change the oil fume extraction capacity of the range hood, so that the oil fume extraction capacity of the range hood can be matched with the current oil fume concentration. In one embodiment, the fan speed of the range hood is controlled according to the variation of the concentration difference variation of the first detection period and the variation of the concentration difference variation of the previous detection period. In one embodiment, the fan speed of the range hood is controlled according to the change of the concentration difference change quantity relative to the change threshold value. In one embodiment, the fan speed of the range hood is controlled according to the variation trend of the concentration difference variation of the first detection period and the N detection periods before the first detection period.
In the above embodiment, the concentration difference of the range hood in the first detection period in the operation process is obtained, the concentration difference variation of the first detection period is determined, the concentration difference variation is the difference between the concentration difference of the range hood in the first detection period and the concentration difference of the range hood in the second detection period, and the fan of the range hood is controlled according to the concentration difference variation of the first detection period. The oil smoke concentration difference is acquired in real time, the concentration difference of the last detection period is used as the reference value of the current detection period to determine the concentration difference change condition of the current detection period, the change condition of the oil smoke concentration can be reflected more intuitively and accurately, the condition of misinformation of the oil smoke concentration can be reduced, and when the oil smoke concentration changes, the oil smoke absorption effect of the range hood is favorably ensured, the suction force of the range hood is matched with the current oil smoke concentration, the use requirement of a user is met, and the intelligence degree of the smoking function of the range hood is improved.
In one embodiment, the concentration difference of the first detection cycle includes a concentration difference at a plurality of times, and determining the concentration difference change amount of the first detection cycle includes: respectively calculating the difference between the concentration difference at each moment and the concentration difference in the second detection period to obtain the concentration difference variation at each moment; an average value of the concentration difference change amounts is determined from the concentration difference change amount at each time, and the average value of the concentration difference change amounts is determined as the concentration difference change amount of the first detection period.
Specifically, each detection period obtains concentration differences at a plurality of moments, respectively calculates concentration differences between a first oil smoke concentration and a second oil smoke concentration at the same moment to obtain a concentration difference at each moment, and then respectively calculates a difference value between the concentration difference at each moment and the concentration difference at a second detection period to obtain a concentration difference variation at each moment, wherein the concentration difference at the second detection period is an average value of the concentration differences at the plurality of moments of the second detection period. The average of the concentration difference variation amounts at a plurality of times is used as the concentration difference variation amount in the detection period. The oil smoke concentration obtained for multiple times in each detection period can reduce errors (such as errors of data obtained by a detection device) caused by the data obtaining process, and improve the detection accuracy of the oil smoke change condition. In a specific embodiment, the interval time of each detection period is set to be 10min, and a round of first oil smoke concentration and second oil smoke concentration is obtained every 10min under the state that the range hood continuously operates. Acquiring concentration data for 6 times in the current detection period, calculating a difference value to obtain concentration differences CC2 of 6 current detection periods, and calculating concentration difference variation CF2 between the concentration difference CC2 of the 6 current detection periods and the concentration difference CC1 of the last detection period respectively, wherein CC1 is an average value of the concentration differences of the 6 last detection periods.
In one embodiment, step S300 includes:
s310, determining the variation trend of the concentration difference variation according to the concentration difference variation of the first detection period and the concentration difference variation of the historical detection period; the concentration difference variation of the historical detection period is the concentration difference variation of N continuous detection periods before the first detection period, wherein N is a positive integer;
and S320, controlling the rotating speed of the fan of the range hood according to the variation trend of the concentration difference variation.
Specifically, the variation trend of the current concentration difference variation can be judged according to the concentration difference variation of N detection periods before the first detection period, and the variation trend of the concentration difference variation can reflect the variation trend of the current oil smoke concentration, so that the variation trend of the oil smoke absorption capacity (suction) of the range hood can be determined, and the suction of the range hood can be changed by controlling the rotating speed of the fan. The rotating speed of the fan is determined according to the variation trend of the concentration difference variation, so that the suction force of the range hood can be more accurately controlled to be matched with the current oil smoke concentration.
In one embodiment, the trend of the concentration difference change amount includes a linear increasing change, a linear decreasing change and a stable state maintaining state; step S320 specifically includes: if the variation trend of the concentration difference variation is linear incremental variation, the rotating speed of a fan of the range hood is increased; if the variation trend of the concentration difference variation is linear decreasing variation, reducing or maintaining the rotating speed of a fan of the range hood; and if the variation trend of the concentration difference variation is to keep a stable state, keeping the rotating speed of the fan of the range hood.
Specifically, the variation tendency of the concentration difference variation amount is a variation of the concentration difference variation amount determined in the first detection period and N detection periods before the first detection period, and the linear incremental variation is a variation of the concentration difference variation amount gradually increasing (for example, the concentration difference variation amount in the first detection period is larger than that in the second detection period, and the concentration difference variation amount in the second detection period is larger than that in the third detection period). The variation trend is linear incremental variation, which shows that the oil smoke concentration difference is becoming larger at the moment, the suction force of the range hood is gradually weaker than the suction force required by the current oil smoke concentration, and the rotating speed of a fan of the range hood needs to be increased so as to increase the suction force of the range hood; the linear decreasing change is a change condition that the concentration difference change is gradually reduced (for example, the concentration difference change in the first detection period is smaller than the concentration difference change in the second detection period, and the concentration difference change in the second detection period is smaller than the concentration difference change in the third detection period), and the change trend is a linear decreasing change which indicates that the suction force of the range hood at the moment is gradually stronger than the suction force required by the current oil smoke concentration, so that the rotating speed of a fan of the range hood can be reduced to reduce the suction force of the range hood, or the rotating speed of the fan of the range hood is kept unchanged; the stable state maintaining state is the condition that the concentration difference variation is not changed (for example, the concentration difference variation of the first detection period is equal to the concentration difference variation of the second detection period, and the concentration difference variation of the second detection period is equal to the concentration difference variation of the third detection period), and the variation trend is that the stable state maintaining state indicates that the suction force of the range hood can be matched with the current oil smoke concentration at the moment, and the current fan rotating speed is maintained.
In one embodiment, the variation trend of the concentration difference variation includes a non-linear variation, and the step S400 specifically includes: and if the variation trend of the concentration difference variation is nonlinear variation, determining the suction information of the range hood according to the concentration difference variation of the first detection period and the average value of the historical concentration difference variations.
Specifically, the non-linear change is a change in the change pattern of the concentration difference change amount in the history detection period and the first detection period in more than one pattern, such as the concentration difference change amount increasing first and then decreasing, or increasing first and then not changing, or not changing first and then decreasing. In this case, the suction information of the range hood cannot be determined only from the increase or decrease of the concentration difference variation. In this embodiment, first, an average value of the concentration difference variation of N consecutive detection periods before the first detection period is calculated, the average value of the concentration difference variation is used as a determination reference value of the variation condition of the concentration difference variation of the first detection period, and the suction information of the current range hood is determined according to the magnitude relationship between the concentration difference variation of the first detection period and the average value of the concentration difference variation. And after the comparison of the current round is finished, clearing the average value of the concentration difference variation of the comparison of the current round, judging the variation trend of the concentration difference variation in the next detection period, and determining the suction information of the next round.
In one embodiment, in the concentration difference variation amount of the first detection period and the concentration difference variation amount of the history detection period, if the concentration difference variation amount of the (i + 1) th detection period is larger than the concentration difference variation amount of the (i) th detection period, the variation trend is a linear incremental variation; wherein i is a positive integer and is more than or equal to 1 and less than or equal to N; if the concentration difference variation of the (i + 1) th detection period is smaller than that of the (i) th detection period, the variation trend is linear decreasing variation; if the concentration difference variation of the (i + 1) th detection period is equal to that of the (i) th detection period, the variation trend is no variation; and if the concentration difference variation does not meet the condition that the (i + 1) th concentration difference variation is larger than the ith concentration difference variation, or the (i + 1) th concentration difference variation is smaller than the ith concentration difference variation, or the (i + 1) th concentration difference variation is equal to the ith concentration difference variation, the variation trend is nonlinear variation.
In one embodiment, the controlling the rotation speed of the fan of the range hood according to the average value of the concentration difference variation of the historical detection period and the concentration difference variation of the first detection period specifically includes: if the concentration difference variation of the first detection period is larger than the average value of the concentration difference variation, the rotating speed of a fan of the range hood is increased; if the concentration difference variation of the first detection period is smaller than the average value of the concentration difference variation, reducing or keeping the rotating speed of a fan of the range hood; and if the concentration difference variation of the first detection period is equal to the average value of the concentration difference variations, maintaining the rotating speed of the fan of the range hood.
Specifically, the concentration difference variation of the first detection period is larger than the average value of the concentration difference variations, which indicates that the oil smoke concentration difference is becoming larger, the suction force of the range hood is weakened compared with the suction force required by the current oil smoke concentration, the oil smoke suction capability of the range hood cannot effectively suck the current oil smoke, the oil smoke suction capability is smaller, and the rotating speed of a fan of the range hood is increased to increase the suction force, so that the oil smoke concentration difference is reduced; the concentration difference variation of the first detection period is smaller than the average value of the concentration difference variation, which shows that the oil smoke concentration difference is smaller at the moment, the suction force of the range hood is stronger than the suction force required by the current oil smoke concentration, the oil smoke suction capability of the range hood is larger, the rotating speed of a fan can be kept unchanged, the rotating speed of the fan of the range hood can be reduced to reduce the suction force, and the electric quantity is saved; the concentration difference variation of the first detection period is equal to the average value of the concentration difference variation, which indicates that the oil smoke concentration difference basically keeps unchanged, the suction force of the range hood integrally tends to be stable, the range hood can be matched with the current oil smoke concentration, and the rotating speed of the fan keeps unchanged.
In one embodiment, if the first detection period is an initial detection period, the concentration difference of the second detection period is an initial reference value; as shown in fig. 2, the control method further includes:
a1, acquiring a first initial oil smoke concentration and a second initial oil smoke concentration of the range hood at a starting stage; the first initial oil smoke concentration is obtained by detecting through a first oil smoke detection device, and the second initial oil smoke concentration is obtained by detecting through a second oil smoke detection device;
and A2, determining an initial reference value according to the concentration difference of the first initial oil smoke concentration and the second initial oil smoke concentration.
Specifically, the initial detection period is a first detection period of the range hood at each starting stage, and in the first detection period, an initial reference value is used as a comparison value of the concentration difference of the first detection period, and then the concentration difference of the second detection period is the initial reference value. The initial oil smoke concentration is obtained when the range hood is started, the range hood is started at every time, the first oil smoke detection device of the air inlet pre-detects the oil smoke environment condition at the air inlet to obtain the first initial oil smoke concentration, and meanwhile, the second oil smoke detection device of the air outlet detects the second initial oil smoke concentration detected after the current flue and the motor wind power. Theoretically, if the difference between the first initial soot concentration and the second initial soot concentration is 0, the difference can be regarded as a set difference. In fact, the difference is not necessarily 0 depending on the time of the range hood used by the user, the whole wind cabinet system and flue system, and the effect of the losses of the motor itself. The initial reference value is determined according to the change of the oil smoke concentration, and the initial reference value can be obtained through self detection after the range hood is powered on and the motor is started each time. The running conditions of the whole flue system of the current range hood and the motor rotating speed for removing the current oil smoke concentration are reflected by updating the initial reference value when the motor is started every time. The method can eliminate the influence of system errors, ensure the accuracy of the current oil smoke concentration detection, and is more accurate compared with the method with system error interference in the prior art. When the oil smoke concentration data is obtained, the first initial oil smoke concentration and the second initial oil smoke concentration at one moment can be obtained, and the first initial oil smoke concentration and the second initial oil smoke concentration at a plurality of moments can also be obtained. In one embodiment, the interval time of each moment is a preset interval time, the preset interval time is determined according to actual conditions, in some embodiments, the interval time of each moment is 10ms, and the first initial oil smoke concentration and the second initial oil smoke concentration of 5-7 moments are obtained respectively.
In one embodiment, the first initial oil smoke concentration and the second initial oil smoke concentration of the range hood at the start stage include the first initial oil smoke concentration and the second initial oil smoke concentration at a plurality of moments at the start stage, and the step a2 specifically includes: respectively calculating the concentration difference between the first initial oil smoke concentration and the second initial oil smoke concentration at each moment to obtain the concentration difference at each moment; and calculating a concentration difference average value according to the concentration difference at each moment, and taking the concentration difference average value as an initial reference value.
Specifically, after the range hood is started, first initial oil smoke concentrations and second initial oil smoke concentrations corresponding to multiple moments are obtained, concentration differences between the first initial oil smoke concentrations and the second initial oil smoke concentrations corresponding to each moment are calculated to obtain concentration differences of each moment, the concentration differences of all the moments are averaged to obtain concentration difference average values, and the obtained concentration difference average values are used as initial reference values. The error of the detection device in the data acquisition process can be reduced by acquiring the concentration difference at a plurality of moments, and the accuracy of the initial reference value is improved.
The beneficial effects of the present invention will be described by comparing the control effects of the range hood of the prior art with the control effects of the present invention.
The existing oil smoke detection control mode is that after the range hood acquires the change of the oil smoke concentration, the suction force of the range hood is simply adjusted according to the change of the oil smoke concentration. As shown in fig. 3 and 4, after the soot concentration is obtained, the range hood starts to control its suction force. With the change of the oil smoke concentration, the suction force is also changed. Although the change of the oil smoke concentration is not large in the front section, the suction curve is greatly changed, the amplitude of the suction curve in the whole process is greatly changed, and the change of the suction is difficult to be accurately controlled according to the change of the oil smoke concentration.
In the invention, the suction force of the range hood is adjusted according to the concentration difference change of the air inlet and the air outlet instead of the change of the acquired oil smoke concentration. As shown in fig. 5 to 8, comparison is performed after the oil smoke concentrations of the air inlet and the air outlet are obtained each time. And analyzing the trend of the oil smoke concentration according to the change of the difference value. And the current oil smoke concentration of the air inlet and the air outlet is obtained in real time, so that the error of the system and the interference of other air flows are reduced. The oil smoke situation at that time can be reflected better. By comparing fig. 4 and fig. 8, it can be found that, under the condition of obtaining the concentration of the range hood at the same time, the detection control mode of the invention is more gentle than the existing detection control mode for the suction force change curve, and the suction force of the range hood can be more effectively and accurately adjusted according to the concentration of the oil smoke in real time.
It should be understood that, although the steps in the flowcharts of fig. 1 and 2 are shown as being sequentially acquired as indicated by the arrows, the steps are not necessarily executed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 and 2 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternatively with other steps or at least a portion of the steps or stages in other steps.
In one embodiment, there is also provided a control device of a range hood, including: the concentration difference acquisition module, the concentration difference variable quantity determination module and the control module are connected with the control module; the concentration difference acquisition module is used for acquiring the concentration difference of the range hood in a first detection period in the operation process, wherein the concentration difference is the difference value of the first oil smoke concentration and the second oil smoke concentration; the first oil smoke concentration is the oil smoke concentration detected by the first oil smoke detection device, and the second oil smoke concentration is the oil smoke concentration detected by the second oil smoke detection device, wherein the first oil smoke detection device is arranged at an air inlet of the range hood, and the second oil smoke detection device is arranged at an air outlet of the range hood; the concentration difference variation determining module is used for determining the concentration difference variation of the first detection period, and the concentration difference variation is the difference value of the concentration difference of the range hood in the first detection period and the concentration difference of the second detection period; the second detection period precedes the first detection period; the control module is used for controlling the rotating speed of a fan of the range hood according to the concentration difference variation of the first detection period.
In one embodiment, the concentration difference of the first detection cycle is a concentration difference at a plurality of times, and the concentration difference change amount determination module includes: a first calculation unit and a second calculation unit. The first calculating unit is used for calculating the difference value between the concentration difference at each moment and the concentration difference in the second detection period respectively to obtain the concentration difference variation at each moment; the second calculation unit is configured to determine an average value of the concentration difference change amounts from the concentration difference change amount at each time, and determine the average value of the concentration difference change amounts as the concentration difference change amount of the first detection period.
In one embodiment, the control module includes a trend determination unit and a fan control unit. The trend determining unit is used for determining the variation trend of the concentration difference variation according to the concentration difference variation of the first detection period and the concentration difference variation of the historical detection period; the concentration difference variation of the historical detection period is the concentration difference variation of N continuous detection periods before the first detection period, wherein N is a positive integer; the fan control unit is used for controlling the fan rotating speed of the range hood according to the variation trend of the concentration difference variation.
In one embodiment, the trend of the concentration difference change amount includes a linear increasing change, a linear decreasing change and a stable state maintaining state; the fan control unit comprises a first control unit, and the first control unit is used for increasing the rotating speed of the fan of the range hood if the variation trend of the concentration difference variation is linear incremental variation; if the variation trend of the concentration difference variation is linear decreasing variation, reducing or keeping the rotating speed of the fan of the range hood; and if the variation trend of the concentration difference variation is to keep a stable state, keeping the rotating speed of the fan of the range hood.
In one embodiment, the variation trend of the concentration difference variation includes a non-linear variation, and the fan control unit further includes a second control unit, and the second control unit is configured to control the fan speed of the range hood according to an average value of the concentration difference variations in the historical detection periods and the concentration difference variation in the first detection period if the variation trend of the concentration difference variation is a non-linear variation.
In one embodiment, the second control unit is specifically configured to increase the rotation speed of the fan of the range hood if the variation of the concentration difference in the first detection period is greater than the average value of the variation of the concentration difference; if the concentration difference variation of the first detection period is smaller than the average value of the concentration difference variation, reducing or keeping the rotating speed of a fan of the range hood; and if the concentration difference variation of the first detection period is equal to the average value of the concentration difference variations, maintaining the rotating speed of the fan of the range hood.
In one embodiment, if the first detection period is an initial detection period, the concentration difference of the second detection period is an initial reference value; the control device of the range hood further comprises: the device comprises an initial oil smoke concentration obtaining module and an initial reference value determining module. The initial oil smoke concentration acquisition module is used for acquiring a first initial oil smoke concentration and a second initial oil smoke concentration of the range hood at a starting stage; the first initial oil smoke concentration is obtained by detecting a first oil smoke detection device, and the second initial oil smoke concentration is obtained by detecting a second oil smoke detection device; the initial reference value determining module is used for determining an initial reference value according to the concentration difference between the first initial oil smoke concentration and the second initial oil smoke concentration.
In one embodiment, the first initial oil smoke concentration and the second initial oil smoke concentration of the range hood in the starting stage comprise the first initial oil smoke concentration and the second initial oil smoke concentration at a plurality of moments in the starting stage, and the initial reference value determining module comprises a third calculating unit and a fourth calculating unit. The third calculating unit is used for calculating the concentration difference between the first initial oil smoke concentration and the second initial oil smoke concentration at each moment respectively to obtain the concentration difference at each moment; the fourth calculating unit is used for calculating the concentration difference average value according to the concentration difference at each moment and taking the concentration difference average value as the initial reference value.
In one embodiment, a range hood is also provided, which comprises an air inlet and an air outlet; as shown in fig. 9 and 10, the range hood 500 further includes: fan 510, first oil smoke detection device 520, second oil smoke detection device and controller 530. The first oil smoke detection device 510 is arranged at the air inlet and is used for acquiring a first oil smoke concentration; the second oil smoke detection device 520 is arranged at the air outlet and is used for acquiring a second oil smoke concentration; the controller 530 comprises a memory storing a computer program and a processor implementing the steps of the above-described method embodiments when executing the computer program.
Specifically, the first oil smoke detection device and the second oil smoke detection device may be any device capable of detecting oil smoke concentration, such as an infrared detection device. The first oil smoke detection device is arranged around an air inlet of the range hood, the second oil smoke detection device is arranged around an air outlet of the range hood, and the controller is used for adjusting the rotating speed of the fan after processing data acquired by the oil smoke concentration detection device, so that the suction force of the range hood is matched with the current oil smoke concentration.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A control method of a range hood is characterized by comprising the following steps:
acquiring a concentration difference of a first detection period of the range hood in the operation process, wherein the concentration difference is a difference value between a first oil smoke concentration and a second oil smoke concentration; the first oil smoke concentration is the oil smoke concentration detected by a first oil smoke detection device, and the second oil smoke concentration is the oil smoke concentration detected by a second oil smoke detection device, wherein the first oil smoke detection device is arranged at an air inlet of the range hood, and the second oil smoke detection device is arranged at an air outlet of the range hood;
determining concentration difference variation of a first detection period, wherein the concentration difference variation is a difference value between the concentration difference of the range hood in the first detection period and the concentration difference of a second detection period, and the second detection period is before the first detection period;
and controlling the rotating speed of a fan of the range hood according to the concentration difference variation of the first detection period.
2. The control method of the range hood according to claim 1, wherein the concentration difference of the first detection period comprises concentration differences at a plurality of moments, and the determining the concentration difference variation of the first detection period comprises:
respectively calculating the difference between the concentration difference at each moment and the concentration difference in the second detection period to obtain the concentration difference variation at each moment;
an average value of the concentration difference change amounts is determined from the concentration difference change amount at each time, and the average value of the concentration difference change amounts is determined as the concentration difference change amount of the first detection period.
3. The method for controlling a range hood according to claim 1, wherein the controlling the fan speed of the range hood according to the concentration difference variation of the first detection period comprises:
determining the variation trend of the concentration difference variation according to the concentration difference variation of the first detection period and the concentration difference variation of the historical detection period; the concentration difference variation of the historical detection period is the concentration difference variation of N continuous detection periods before the first detection period, wherein N is a positive integer;
and controlling the rotating speed of the fan of the range hood according to the variation trend of the concentration difference variation.
4. The control method of the range hood according to claim 3, wherein the variation trend of the concentration difference variation includes a linear increasing variation, a linear decreasing variation and a stable state maintaining; the control of the fan rotating speed of the range hood according to the variation trend of the concentration difference variation comprises the following steps:
if the variation trend of the concentration difference variation is linear incremental variation, the rotating speed of a fan of the range hood is increased;
if the variation trend of the concentration difference variation is linear decreasing variation, reducing or maintaining the rotating speed of the fan of the range hood;
and if the variation trend of the concentration difference variation is in a stable state, maintaining the rotating speed of the fan of the range hood.
5. The control method of the range hood according to claim 3 or 4, wherein the variation trend of the concentration difference variation includes a non-linear variation, and the controlling the fan rotation speed of the range hood according to the variation trend of the concentration difference variation includes:
and if the variation trend of the concentration difference variation is nonlinear variation, controlling the rotating speed of the fan of the range hood according to the average value of the concentration difference variation of the historical detection period and the concentration difference variation of the first detection period.
6. The method for controlling a range hood according to claim 5, wherein the controlling the fan speed of the range hood according to the average of the concentration difference variation of the historical detection periods and the concentration difference variation of the first detection period comprises:
if the concentration difference variation of the first detection period is larger than the average value of the concentration difference variations, the rotating speed of a fan of the range hood is increased;
if the concentration difference variation of the first detection period is smaller than the average value of the concentration difference variations, reducing or maintaining the rotating speed of a fan of the range hood;
and if the concentration difference variation of the first detection period is equal to the average value of the concentration difference variations, maintaining the rotating speed of the fan of the range hood.
7. The control method of the range hood according to claim 1, wherein if the first detection period is an initial detection period, the concentration difference of the second detection period is an initial reference value; the control method further comprises the following steps:
acquiring a first initial oil smoke concentration and a second initial oil smoke concentration of the range hood at a starting stage; the first initial oil smoke concentration is obtained by detecting through the first oil smoke detection device, and the second initial oil smoke concentration is obtained by detecting through the second oil smoke detection device;
and determining the initial reference value according to the concentration difference between the first initial oil smoke concentration and the second initial oil smoke concentration.
8. The control method of the range hood according to claim 7, wherein the first and second initial concentrations of soot in the start-up phase of the range hood include first and second initial concentrations of soot at a plurality of times in the start-up phase, and the determining the initial reference value according to the concentration difference between the first and second initial concentrations of soot includes:
respectively calculating the concentration difference between the first initial oil smoke concentration and the second initial oil smoke concentration at each moment to obtain the concentration difference at each moment;
and calculating a concentration difference average value according to the concentration difference at each moment, and taking the concentration difference average value as the initial reference value.
9. A control device of a range hood is characterized by comprising:
the concentration difference acquisition module is used for acquiring the concentration difference of the range hood in a first detection period in the operation process, wherein the concentration difference is the difference value of the first oil smoke concentration and the second oil smoke concentration; the first oil smoke concentration is the oil smoke concentration detected by a first oil smoke detection device, and the second oil smoke concentration is the oil smoke concentration detected by a second oil smoke detection device, wherein the first oil smoke detection device is arranged at an air inlet of the range hood, and the second oil smoke detection device is arranged at an air outlet of the range hood;
the concentration difference variation determining module is used for determining the concentration difference variation of a first detection period, wherein the concentration difference variation is the difference value between the concentration difference of the range hood in the first detection period and the concentration difference of the range hood in a second detection period; the second detection period precedes the first detection period;
and the control module is used for controlling the rotating speed of the fan of the range hood according to the concentration difference variation of the first detection period.
10. The utility model provides a range hood, includes air intake and air outlet, its characterized in that still includes:
a fan;
the first oil smoke detection device is arranged at the air inlet and used for acquiring first oil smoke concentration;
the second oil smoke detection device is arranged at the air outlet and used for acquiring a second oil smoke concentration;
a controller comprising a memory storing a computer program and a processor implementing the steps of the method of any one of claims 1 to 8 when the processor executes the computer program.
CN202210316829.7A 2022-03-29 2022-03-29 Control method and device of range hood and range hood Pending CN114704861A (en)

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Application Number Priority Date Filing Date Title
CN202210316829.7A CN114704861A (en) 2022-03-29 2022-03-29 Control method and device of range hood and range hood

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210316829.7A CN114704861A (en) 2022-03-29 2022-03-29 Control method and device of range hood and range hood

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103822283A (en) * 2014-03-12 2014-05-28 黄善花 Air capacity controlling device and method for extractor hood
CN109974059A (en) * 2019-04-29 2019-07-05 广东万和热能科技有限公司 Range hood wind pressure detects control method, device, equipment and storage medium
WO2021135972A1 (en) * 2020-01-03 2021-07-08 宁波方太厨具有限公司 Integrated cooking utensil and control method therefor
CN113280385A (en) * 2021-06-10 2021-08-20 青岛海尔智慧厨房电器有限公司 Range hood control method and range hood
CN113280381A (en) * 2021-06-02 2021-08-20 青岛海尔智慧厨房电器有限公司 Range hood gear adjusting method and range hood
CN113280382A (en) * 2021-06-02 2021-08-20 青岛海尔智慧厨房电器有限公司 Method for adjusting air speed of range hood and range hood

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103822283A (en) * 2014-03-12 2014-05-28 黄善花 Air capacity controlling device and method for extractor hood
CN109974059A (en) * 2019-04-29 2019-07-05 广东万和热能科技有限公司 Range hood wind pressure detects control method, device, equipment and storage medium
WO2021135972A1 (en) * 2020-01-03 2021-07-08 宁波方太厨具有限公司 Integrated cooking utensil and control method therefor
CN113280381A (en) * 2021-06-02 2021-08-20 青岛海尔智慧厨房电器有限公司 Range hood gear adjusting method and range hood
CN113280382A (en) * 2021-06-02 2021-08-20 青岛海尔智慧厨房电器有限公司 Method for adjusting air speed of range hood and range hood
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