A control method of a range hood and a range hood

Abstract

This invention discloses a control method for a range hood and a range hood itself. The range hood includes a fan, and the control method includes: S1, after the fan is turned on, acquiring the oil fume concentration value Q. n S2. If the oil fume concentration value Q is obtained, the corresponding reference oil fume concentration value is obtained. n The difference between the value and the reference oil fume concentration value △Q n If the difference is greater than a preset value △Q0, the fan speed is increased by △V; otherwise, it is decreased by △V; wherein △Q0 ≥ 0. In this invention, the oil fume concentration value Q... n The difference between the value and the reference oil fume concentration value △Q n By controlling the fan speed, the influence of individual differences and assembly errors of range hoods on the fan speed control is avoided. When the difference △Q n When the difference is greater than the preset value △Q0, it indicates that the current oil fume concentration value Q is greater than the preset value △Q0. n When the difference is large, increasing the fan speed will allow the fumes to be expelled promptly; conversely, when the difference ΔQ is small... n When the difference is less than the preset value △Q0, it indicates that the current oil fume concentration value Q is less than the preset value △Q0. n When the fan speed is low, reducing the fan speed can decrease the energy consumption of the range hood.

Description

Technical Field

[0001] This invention belongs to the field of mechanical equipment technology, specifically, it relates to a control method for a range hood and a range hood. Background Technology

[0002] A range hood is a kitchen appliance installed above the stove to purify the kitchen environment. When the range hood is powered on, the motor is driven, causing the fan to rotate at high speed. This creates a negative pressure zone in the space above the stove, drawing the cooking fumes from the room into the range hood.

[0003] The oily fumes are filtered through the oil screen of the range hood for the first oil-fume separation. Then, they enter the duct of the range hood and undergo a second oil-fume separation through the rotation of the impeller. The oil fumes in the duct are subjected to centrifugal force, and the oil mist condenses into oil droplets, which are collected in the oil cup through the oil path. Finally, the purified fumes are discharged along a fixed path.

[0004] Currently, most range hoods have multiple fan speed settings, which are adjusted according to the concentration of cooking fumes. Some products on the market add intelligent functionality by incorporating sensors to detect cooking fumes. When fumes are detected, the appropriate fan speed is automatically activated to ensure timely fume removal.

[0005] However, due to individual differences in sensors, assembly errors, and the tendency for oil fumes to accumulate on the sensors, the detected oil fume concentration often differs from the actual oil fume concentration, resulting in inaccurate detection results. Consequently, the fan speed controlled based on these results is also inaccurate. Insufficient fan speed prevents timely exhaust of oil fumes; excessive fan speed leads to high energy consumption of the range hood.

[0006] In view of this, the present invention is hereby proposed. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the problem that the oil fume concentration detected by the existing range hood is inaccurate, which leads to the inaccuracy of the wind speed controlled based on the detection result. The present invention provides a control method and range hood for a range hood, which makes the detection result of oil fume concentration more accurate, thereby making the wind speed control of the range hood more accurate, improving the oil fume emission efficiency and reducing energy consumption.

[0008] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0009] A method for controlling a range hood, the range hood including a fan.

[0010] S1. After the fan is turned on, obtain the oil fume concentration value Q. n And obtain the corresponding reference oil fume concentration value.

[0011] S2, if the oil fume concentration value Q n The difference between the value and the reference oil fume concentration value △Q n If the difference is greater than the preset value △Q0, the fan speed is increased by △V, and vice versa; △Q0≥0.

[0012] Furthermore, in step S2,

[0013] If the oil fume concentration value Q1 is obtained for the first time, the reference oil fume concentration value is the preset value;

[0014] If the oil fume concentration value Q is obtained for the nth time... n The reference oil fume concentration value is the preset value, or the oil fume concentration value Q detected in the nkth time. n-k Or, Q is the average value of the oil fume concentration detected from the 1st to the nkth time. (Q1+Q2+……Qn-k) / (n-k) The n≥2, 1≤k<n, and n and k are both integers.

[0015] Furthermore, the △V and |△Q n | There is a positive correlation.

[0016] Furthermore, the preset function is △V=A*|△Q n |, where coefficient A is a positive number

[0017] In step S2, the difference △Q n Substituting this into the function, we obtain the △V.

[0018] Further, step S2 includes:

[0019] S21. Obtain the difference △Q n The difference △Q from the previous one n-1 The difference between them is △Q';

[0020] S22. If the difference ΔQ' = 0, the control coefficient A remains unchanged; if the difference ΔQ' > 0, the control coefficient A increases; if the difference ΔQ' < 0, the control coefficient A decreases.

[0021] Furthermore, the coefficient A is positively correlated with the difference ΔQ'.

[0022] Furthermore, the preset difference △Q n The database corresponding to △V

[0023] In step S2, based on the obtained difference △Q n Retrieve the corresponding △V from the database.

[0024] Furthermore, step S0 is included before step S1.

[0025] S0, preset oil fume concentration value Q0, obtain oil fume concentration value Q, if Q>Q0, control the fan to turn on;

[0026] Preferably, a preset reference oil fume concentration value is used. If the difference between the obtained oil fume concentration value Q and the reference oil fume concentration value is △Q > Q0, the fan is controlled to start.

[0027] Furthermore, the wind speed at which the fan is turned on is positively correlated with the oil fume concentration value Q;

[0028] Preferably, the fan speed includes low, medium, high, and ultra-high settings, and the corresponding oil fume concentration ranges for low, medium, high, and ultra-high settings are preset. Step S0 includes:

[0029] S01. Obtain the oil fume concentration value Q.

[0030] S02. Determine the range of oil fume concentration values ​​Q, and control the fan speed to be the speed corresponding to that range of oil fume concentration values.

[0031] The present invention also discloses a range hood controlled by any of the control methods described above.

[0032] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0033] In this invention, the oil fume concentration value Q is used as the basis. n The difference between the value and the reference oil fume concentration value △Q n Controlling the fan speed avoids the impact of individual differences and assembly errors in range hoods on fan speed control; when the difference △Q n When the difference is greater than the preset value △Q0, it indicates that the current oil fume concentration value Q is greater than the preset value △Q0. n When the difference is large, increasing the fan speed will allow the fumes to be expelled promptly; conversely, when the difference ΔQ is small... n When the difference is less than the preset value △Q0, it indicates that the current oil fume concentration value Q is less than the preset value △Q0. n When the fan speed is low, reducing the fan speed can decrease the energy consumption of the range hood.

[0034] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0035] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0036] Figure 1 This is a flowchart of a control method for the range hood of the present invention;

[0037] Figure 2 This is a flowchart of another control method for the range hood of the present invention;

[0038] Figure 3 This is a flowchart of another control method for the range hood of the present invention;

[0039] Figure 4 This is a flowchart of another control method for the range hood of the present invention;

[0040] Figure 5 This is a flowchart of another control method for the range hood of the present invention.

[0041] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] like Figures 1 to 5 As shown, this invention discloses a control method for a range hood. The range hood includes a fan, and the control method for the range hood includes:

[0046] S1. After the fan is turned on, obtain the oil fume concentration value Q. nAnd obtain the corresponding reference oil fume concentration value;

[0047] S2, if the oil fume concentration value Q n The difference between the value and the reference oil fume concentration value △Q n If the difference is greater than the preset value △Q0, the fan speed is increased by △V, and vice versa; △Q0≥0.

[0048] In this invention, the oil fume concentration value Q is used as the basis. n The difference between the value and the reference oil fume concentration value △Q n Controlling the fan speed avoids the impact of individual differences and assembly errors in range hoods on fan speed control. When the difference △Q n When the difference is greater than the preset value △Q0, it indicates that the current oil fume concentration value Q is greater than the preset value △Q0. n When the difference is large, increasing the fan speed will allow the fumes to be expelled promptly; conversely, when the difference ΔQ is small... n When the difference is less than the preset value △Q0, it indicates that the current oil fume concentration value Q is less than the preset value △Q0. n When the fan speed is low, reducing the fan speed can decrease the energy consumption of the range hood.

[0049] As one embodiment of the present invention, such as Figure 1 As shown, the control method for a range hood includes the following control steps:

[0050] S11, Fan starts, preset difference △Q0 and reference oil fume concentration value;

[0051] S12, Obtain the oil fume concentration value Q n ;

[0052] S21. Calculate Q n The difference between the value and the reference oil fume concentration value △Q n ;

[0053] S22. Determine the difference ΔQ n Is it greater than the preset difference △Q0?

[0054] S23. If so, increase the fan speed by ΔV.

[0055] Otherwise, determine the difference △Q n If the difference is less than the preset value △Q0, control the fan speed to decrease by △V; otherwise, repeat steps S12 to S23 until the range hood is turned off.

[0056] In this embodiment, the reference oil fume concentration value can be preset before the range hood leaves the factory. Specifically, the range hood is first tested before leaving the factory. The range hood is used to detect oil fumes of known concentration to obtain the actual detection value. The preset reference oil fume concentration value is obtained by subtracting the known concentration from the actual detection value.

[0057] Different range hoods may produce different reference oil fume concentration values ​​due to individual differences in components and the different installation positions of components, requiring individual test presets.

[0058] In this embodiment, if the difference ΔQ n If the difference is greater than the preset value △Q0, it indicates that the current oil fume concentration value Q is greater than the preset value △Q0. n If the difference is large, increasing the fan speed by ΔV will help to expel the fumes more promptly. If the difference is ΔQ... n If the difference is less than the preset value △Q0, it indicates that the current oil fume concentration value Q is less than the preset value △Q0. n When the airflow is relatively small, the fan speed is reduced by ΔV. This ensures that the fumes can be discharged in a timely manner without causing excessive airflow and wasting energy.

[0059] In another embodiment of the present invention, in step S2,

[0060] If the oil fume concentration value Q1 is obtained for the first time, the reference oil fume concentration value is the preset value;

[0061] If the oil fume concentration value Q is obtained for the nth time... n The reference value for the oil fume concentration is the oil fume concentration value Q detected in the nkth time. n-k The n≥2, 1≤k<n, and n and k are both integers.

[0062] In this embodiment, the reference oil fume concentration value is the oil fume concentration value Q detected for the nkth time. n-k Where n≥2, 1≤k<n, and n and k are both integers. That is, the reference oil fume concentration value is the previously detected oil fume concentration value. The oil fume concentration value Q is obtained through calculation. n The difference △Q between the previously detected oil fume concentration value and the value. n This can more accurately indicate the changing patterns of current oil fume concentration.

[0063] In this embodiment, if △Q n If the difference is greater than the preset value △Q0, it indicates a high concentration of oil fumes. In this case, increasing the fan speed can further improve the emission efficiency of the oil fumes. Conversely, if △Q... n If the difference is less than the preset value △Q0, it indicates that the oil fume concentration is relatively low. At this time, the fan speed can be reduced to save energy.

[0064] As one implementation method of this embodiment, such as Figure 2 As shown, the control method for a range hood includes the following control steps:

[0065] S11, Fan starts, preset difference △Q0 and reference oil fume concentration value;

[0066] S12, First acquisition of oil fume concentration value Q1;

[0067] S21. Calculate the difference ΔQ between Q1 and the reference oil fume concentration value. n ;

[0068] S22. Determine the difference ΔQ n Is it greater than the preset difference △Q0?

[0069] S23. If so, increase the fan speed by ΔV.

[0070] Otherwise, determine the difference △Q n If the difference is less than the preset difference △Q0, control the fan speed to decrease by △V; otherwise, proceed to step S24.

[0071] S24. Obtain the oil fume concentration value Q again. n ;

[0072] S25, Calculate Q n The difference between Q1 and ΔQ n Repeat steps S22 to S25 until the range hood is turned off.

[0073] In this embodiment, when the oil fume concentration value Q1 is obtained for the first time, the reference oil fume concentration value is a preset value to ensure that the difference ΔQ obtained in the first time is not exceeded. n Unaffected by the range hood, ensuring accurate wind speed control.

[0074] When the oil fume concentration value Q is obtained again n When the first obtained oil fume concentration value Q1 is used as the reference oil fume concentration value, and the difference ΔQ is obtained... n When the difference is greater than the preset value △Q0, it indicates that the oil fume concentration value is greater than the oil fume concentration value detected in the first test. Controlling the fan speed to increase △V is beneficial for timely exhaust of oil fumes.

[0075] Conversely, when the obtained difference ΔQ n When the difference is less than the preset value △Q0, it indicates that the oil fume concentration value is less than the oil fume concentration value detected in the first test. The fan speed is controlled to decrease by △V to reduce the energy consumption of the range hood.

[0076] As another implementation method of this embodiment, such as Figure 3 As shown, the control method for a range hood includes the following control steps:

[0077] S11, Fan starts, preset difference △Q0 and reference oil fume concentration value;

[0078] S12, First acquisition of oil fume concentration value Q1;

[0079] S21. Calculate the difference ΔQ between Q1 and the reference oil fume concentration value. n ;

[0080] S22. Determine the difference ΔQ n Is it greater than the preset difference △Q0?

[0081] S23. If so, increase the fan speed by ΔV.

[0082] Otherwise, determine the difference △Q n If the difference is less than the preset difference △Q0, control the fan speed to decrease by △V; otherwise, proceed to step S24.

[0083] S24. Obtain the oil fume concentration value Q again. n Record the previously obtained oil fume concentration value Q. n-1 ;

[0084] S25, Calculate Q n With Q n-1 The difference △Q n Repeat steps S22 to S25 until the range hood is turned off.

[0085] In this embodiment, when the oil fume concentration value Q1 is obtained for the first time, the reference oil fume concentration value is a preset value to ensure that the difference ΔQ obtained in the first time is not exceeded. n Unaffected by the range hood, ensuring accurate wind speed control.

[0086] When the oil fume concentration value Q is obtained again n At that time, the oil fume concentration value Q obtained in the (n-1)th time is used. n-1 This is a reference value for oil fume concentration. When the difference ΔQ is obtained... n When the difference is greater than the preset value △Q0, it indicates that the oil fume concentration value is greater than the oil fume concentration value detected in the previous test. Controlling the fan speed to increase △V is beneficial for timely exhaust of oil fumes.

[0087] Conversely, when the obtained difference ΔQ n When the difference is less than the preset value △Q0, it indicates that the oil fume concentration is less than the previous oil fume concentration value. The fan speed is controlled to decrease by △V to reduce the energy consumption of the range hood.

[0088] In this embodiment, when the oil fume concentration value Q is obtained for the nth time... n When the oil fume concentration values ​​detected in the 2nd, 3rd, 4th...kth time are used as reference oil fume concentration values, where k is less than n, this provides multiple selectable schemes for the control method of the present invention.

[0089] As another embodiment of the present invention, such as Figure 4 As shown, the reference oil fume concentration value is the average value Q of the oil fume concentration values ​​detected from the 1st to the nkth time. (Q1+Q2+……Qn-k) / (n-k) .

[0090] Specifically, the following control steps are included:

[0091] S11, Fan starts, preset difference △Q0 and reference oil fume concentration value;

[0092] S12, First acquisition of oil fume concentration value Q1;

[0093] S21. Calculate the difference ΔQ between Q1 and the reference oil fume concentration value. n ;

[0094] S22. Determine the difference ΔQ n Is it greater than the preset difference △Q0?

[0095] S23. If so, increase the fan speed by ΔV.

[0096] Otherwise, determine the difference △Q n If the difference is less than the preset difference △Q0, control the fan speed to decrease by △V; otherwise, proceed to step S24.

[0097] S24. Obtain the oil fume concentration value Q again. n Calculate the average value Q of the oil fume concentration detected from the 1st to the (n-1th)th time. (Q1+Q2+……Qn-1) / (n-1) ;

[0098] S25, Calculate Q n With Q (Q1+Q2+……Qn-1) / (n-1) The difference △Q n Repeat steps S22 to S25 until the range hood is turned off.

[0099] In this embodiment, the average value Q of the previously detected oil fume concentration values ​​will be used. (Q1+Q2+……Qn-1) / (n-1) This serves as a reference value for oil fume concentration, to avoid any adverse impact on the wind speed control of this invention due to inaccurate or large deviations in individual oil fume concentration detection results.

[0100] When △Q n When the value is greater than ΔQ0, it indicates that the current oil fume concentration value Q is... n If the current oil fume concentration is higher than the average of previously detected values, the fan speed should be increased to expel the oil fumes more quickly and reduce their accumulation. When ΔQ n When it is less than △Q0, it indicates that the current oil fume concentration value Q n The fan speed is reduced to a smaller value, further reducing the energy consumption of the range hood.

[0101] In another embodiment of the present invention, the change in wind speed of the fan, ΔV, and |ΔQ n |A positive correlation exists. In △Q n When △Q is greater than △Q0, △Q n The larger the value of ΔQ, the greater the increase in fan speed ΔV. n When ΔQ is less than ΔQ0, ΔQ nThe smaller the value, the greater the reduction in fan speed ΔV. In this embodiment, ΔV adapts to the increase or decrease of ΔQ0, which is beneficial for timely exhaust of fumes, and the increase in fan speed will not be too large, so as to avoid excessive energy consumption of the range hood.

[0102] As one implementation method of this embodiment, such as Figure 5 As shown, the preset function is △V=A*|△Q n |, where coefficient A is a positive number. In step S2, the difference △Q n Substituting these values ​​into the function yields the increase or decrease in wind speed, ΔV.

[0103] Specifically, the following control steps are included:

[0104] S11, Fan starts, preset difference △Q0 and reference oil fume concentration value;

[0105] S12, First acquisition of oil fume concentration value Q1;

[0106] S21. Calculate the difference ΔQ between Q1 and the reference oil fume concentration value. n ;

[0107] S22. Determine the difference ΔQ n Is it greater than the preset difference △Q0?

[0108] S23. If so, the difference △Q n Substitute △V=A*|△Q n In the process, we obtain ΔV, and control the fan speed to increase ΔV.

[0109] Otherwise, determine the difference △Q n Is it less than the preset difference △Q0? If so, adjust the difference △Q0. n Substitute △V=A*|△Q n If ΔV is obtained, the fan speed is controlled to decrease ΔV; otherwise, step S24 is executed.

[0110] S24. Obtain the oil fume concentration value Q again. n Record the previously obtained oil fume concentration value Q. n-1 ;

[0111] S25, Calculate Q n With Q n-1 The difference △Q n Repeat steps S22 to S25 until the range hood is turned off.

[0112] In this embodiment, △V=A*|△Q n | is an empirical formula. The ΔV obtained by the calculation formula in this implementation method can not only expel the oil fumes as quickly as possible, but also avoid excessive wind speed and energy waste.

[0113] In another embodiment of the present invention, step S2 includes:

[0114] Obtain the difference △Q n The difference △Q from the previous one n-1 The difference between them is ΔQ'; where the previous difference ΔQ n-1 The value of oil fume concentration Q detected at the previous detection time. n-1 The difference between the value and the reference oil fume concentration;

[0115] If the difference ΔQ' = 0, the control coefficient A remains unchanged; if the difference ΔQ' > 0, the control coefficient A increases; if the difference ΔQ' < 0, the control coefficient A decreases.

[0116] Specifically, the following steps are included:

[0117] S11, Fan starts, preset difference △Q0 and reference oil fume concentration value;

[0118] S12, First acquisition of oil fume concentration value Q1;

[0119] S21. Calculate the difference ΔQ between Q1 and the reference oil fume concentration value. n ;

[0120] S22. Determine the difference ΔQ n Is it greater than the preset difference △Q0?

[0121] S23, If △Q n If the difference is greater than the preset difference △Q0, calculate the difference △Q. n The difference △Q from the previous one n-1 The difference between them is △Q'.

[0122] When the difference ΔQ' = 0, the difference ΔQ n Substitute △V=A*|△Q n From this, we obtain △V.

[0123] When the difference ΔQ' > 0, the difference ΔQ n Substitute △V=(A+△A)*|△Q n From this, we obtain △V.

[0124] When the difference ΔQ' < 0, the difference ΔQ n Substitute △V=(A-△A)*|△Q n In the process, we obtain ΔV, and control the fan speed to increase ΔV.

[0125] If △Q n If it is less than the preset difference △Q0, calculate the difference △Q. n The difference △Q from the previous one n-1 The difference between them is △Q'.

[0126] When the difference ΔQ' = 0, the difference ΔQ n Substitute △V=A*|△Q n From this, we obtain △V;

[0127] When the difference ΔQ' > 0, the difference ΔQ n Substitute △V=(A+△A)*|△Q n From this, we obtain △V;

[0128] When the difference ΔQ' < 0, the difference ΔQ n Substitute △V=(A-△A)*|△Q n From this, we obtain △V;

[0129] Control the fan speed to decrease ΔV; otherwise, proceed to step S24.

[0130] S24. Obtain the oil fume concentration value Q again. n Record the previously obtained oil fume concentration value Q. n-1 ;

[0131] S25, Calculate Q n With Q n-1 The difference △Q n Repeat steps S22 to S25 until the range hood is turned off.

[0132] In this embodiment, the difference △Q n If the difference is greater than the preset difference ΔQ0, and if ΔQ' > 0, it indicates that the oil fume concentration is not only increasing, but the rate of increase is also increasing. In this case, the control coefficient A is increased, resulting in a larger calculated ΔV, which is beneficial for efficiently reducing the oil fume concentration. Conversely, if ΔQ' < 0, it indicates that although the oil fume concentration is increasing, the rate of increase is small. In this case, the control coefficient A is decreased, resulting in a relatively smaller calculated ΔV, avoiding excessive wind speed increase and wasting wind energy.

[0133] In one implementation of this embodiment, the coefficient A is positively correlated with the difference ΔQ'. This configuration ensures timely exhaust of fumes while avoiding excessive wind speed and wasted wind energy.

[0134] As another embodiment of the present invention, a preset difference △Q is provided. n In step S2, based on the database corresponding to △V, the difference △Q is... n The corresponding increase in wind speed, ΔV, is obtained from the database.

[0135] In this embodiment, each △Q nEach of them has a corresponding wind speed change ΔV, which can control and adjust the wind speed in real time according to the actual oil fume concentration value, so as not to cause oil fume accumulation or waste of wind energy.

[0136] In another embodiment of the present invention, step S0 is included before step S1.

[0137] S0, preset oil fume concentration value Q0, obtain oil fume concentration value Q, if Q>Q0, control the fan to turn on; otherwise, control the fan to remain off.

[0138] In this embodiment, when the obtained oil fume concentration value reaches the preset value, that is, when the oil fume concentration in the environment reaches a certain level, the fan is controlled to start, effectively exhausting the oil fume in the environment, realizing the intelligent start-up of the fan and improving the user experience.

[0139] As one implementation method of this embodiment, a preset reference oil fume concentration value is provided. If the difference ΔQ between the obtained oil fume concentration value Q and the reference oil fume concentration value is greater than the preset oil fume concentration value Q0, the fan is controlled to start.

[0140] The reference oil fume concentration value in this embodiment is the factory set value. Different range hoods may have different reference oil fume concentration values ​​due to individual differences in components and installation locations, and individual test presets are required.

[0141] In this embodiment, the fan is controlled by the relationship between the difference ΔQ and the preset oil fume concentration value Q0, so as to avoid the range hood itself from having an adverse effect on the oil fume detection results, and to make the fan speed controlled according to the oil fume detection results more accurate.

[0142] In another implementation of this embodiment, the fan speed is positively correlated with the oil fume concentration value Q. Specifically, the larger the oil fume concentration value Q, the higher the corresponding fan speed.

[0143] In this embodiment, the wind speed when the fan is turned on is positively correlated with the oil fume concentration value Q, so that the range hood can not only exhaust the oil fumes, but also avoid wasting wind energy.

[0144] In another embodiment of this invention, the fan speed includes low, medium, high, and ultra-high settings, with preset ranges of oil fume concentration values ​​corresponding to the low, medium, high, and ultra-high settings.

[0145] Step S1 includes:

[0146] S01. Obtain the oil fume concentration value Q.

[0147] S02. Determine the range of oil fume concentration values ​​Q that the current oil fume concentration value Q is in, and control the fan speed to the speed level corresponding to that range of oil fume concentration values.

[0148] More specifically, if the obtained fume concentration value Q is in the range of 0-12, the control fan is turned on and the fan speed is set to low; if the obtained fume concentration value Q is in the range of 13-23, the control fan is turned on and the fan speed is set to medium; if the obtained fume concentration value Q is in the range of 24-34, the control fan is turned on and the fan speed is set to high; if the obtained fume concentration value Q is in the range of 35-99, the control fan is turned on and the fan speed is set to ultra-high.

[0149] In this embodiment, the fan speed is selected according to the range of oil fume concentration values ​​Q, making the selection of fan speed more reasonable.

[0150] The present invention also provides a range hood, which is controlled by any of the control methods described in the above embodiments, or by a combination of the control methods described in the above embodiments.

[0151] The range hood of this invention avoids interference from the components of the range hood in the detection of cooking fumes, making the detected fume concentration value more accurately represent the current fume concentration. The fan speed controlled based on this fume concentration is also more accurate, ensuring not only timely exhaust of fumes but also preventing energy waste.

[0152] As one embodiment of the present invention, the range hood includes:

[0153] Fans are used to create a negative pressure environment;

[0154] Oil fume detection device, used to detect the concentration of oil fumes;

[0155] The control system is electrically or communicatively connected to the fume detection device and the fan, and is used to control the fan's on / off state and fan speed based on the fume concentration detected by the fume detection device.

[0156] In this embodiment, the fan is turned on, off, and its speed is controlled based on the oil fume concentration value detected by the oil fume detection device, which makes the fan control more intelligent and more accurate.

[0157] Furthermore, the oil fume detection device in this invention is a photoelectric sensor. A photoelectric sensor is a sensor that uses photoelectric elements as detection elements.

[0158] A photoelectric sensor includes a detection light emitting device and a detection light receiving device. The detection light emitting device emits detection light, and the detection light receiving device receives the detection light. After the received detection light is refracted by the measured substance (such as the concentration of oil fumes), the light intensity will change. Then, the light intensity signal is further converted into an electrical signal by photoelectric elements.

[0159] Photoelectric detection methods have advantages such as high precision, fast response, and non-contact operation. They can also measure a wide range of parameters, and the sensors have simple structures and flexible forms.

[0160] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A control method for a range hood, the range hood including a fan, characterized in that: Step S1: After the fan is turned on, obtain the oil fume concentration value Q. n And obtain the corresponding reference oil fume concentration value; Step S2: If the obtained oil fume concentration value Q n The difference between the value and the reference oil fume concentration value △Q n If the difference is greater than the preset value △Q0, the fan speed is increased by △V, and vice versa; △Q0≥0; Preset function △V=A*|△Q n |, where coefficient A is a positive number, in step S2, the difference △Q n Substituting into the function, we obtain △V; Step S2 includes: Step S21: Obtain the difference △Q n The difference △Q from the previous one n-1 The difference between them is △Q'; Step S22: If the difference △Q' = 0, the control coefficient A remains unchanged; if the difference △Q' > 0, the control coefficient A increases; if the difference △Q' < 0, the control coefficient A decreases.

2. The control method for a range hood according to claim 1, characterized in that: In step S2 If the oil fume concentration value Q1 is obtained for the first time, the reference oil fume concentration value is the preset value; If the oil fume concentration value Q is obtained for the nth time... n The reference oil fume concentration value is the preset value, or the oil fume concentration value Q detected in the nkth time. n-k Or, Q is the average value of the oil fume concentration detected from the 1st to the nkth time. (Q1+Q2+……Qn-k) / (n-k) The n≥2, 1≤k<n, and n and k are both integers.

3. The control method for a range hood according to claim 1, characterized in that: The coefficient A is positively correlated with the difference ΔQ'.

4. The control method for a range hood according to claim 1, characterized in that: Preset difference △Q n The database corresponding to △V In step S2, based on the obtained difference △Q n Retrieve the corresponding △V from the database.

5. The control method for a range hood according to claim 1, characterized in that: Step S0 is included before step S1. Step S0: Preset the oil fume concentration value Q0, obtain the oil fume concentration value Q, and if Q > Q0, control the fan to turn on.

6. The control method for a range hood according to claim 5, characterized in that: A preset reference oil fume concentration value is set. If the difference between the obtained oil fume concentration value Q and the reference oil fume concentration value is △Q > Q0, the fan is controlled to start.

7. A control method for a range hood according to claim 5 or 6, characterized in that: The airflow speed when the fan is turned on is positively correlated with the oil fume concentration value Q.

8. The control method for a range hood according to claim 7, characterized in that: The wind speed at which the fan is turned on is positively correlated with the difference ΔQ.

9. The control method for a range hood according to claim 7, characterized in that: The fan speed includes low, medium, high, and ultra-high settings, with preset ranges for oil fume concentration corresponding to these settings. Step S0 includes: Step S01: Obtain the oil fume concentration value Q; Step S02: Determine the range of oil fume concentration values ​​Q, and control the fan speed to be the speed level corresponding to that range of oil fume concentration values.

10. A range hood, characterized in that: Controlled by any one of the control methods described in claims 1-9.

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