Range hood control method and range hood

Abstract

The present invention relates to a range hood control method and a range hood, wherein the range hood control method includes: collecting air volume values and operating noise values of the range hood at different operating currents and motor speeds, obtaining functional relationships corresponding to the air volume value and the operating noise value with the current value and the speed value, respectively; collecting the current operating current and motor speed of the range hood, and calculating the current operating air volume value and the operating noise value according to the functional relationship; comparing the current operating air volume with a preset air volume value and the current operating noise value with a preset noise value, and controlling the range hood to perform corresponding operations. The method is low-cost, reliable, and stable, and simultaneously controls the range hood to perform corresponding operations by taking into account both the air volume value and the operating noise value, thereby ensuring a good cooking experience.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular to a range hood control method and a range hood. Background Art

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It operates based on the principles of fluid dynamics, using a centrifugal fan installed inside the range hood to draw in and exhaust cooking fumes. A centrifugal fan consists of a volute, an impeller mounted within the volute, and a motor that drives the impeller. As the impeller rotates, negative pressure is generated at the fan's center, drawing cooking fumes from beneath the range hood into the fan. After being accelerated by the fan, the fumes are collected by the volute and directed outside.

[0003] In actual use, users of range hoods generally pay attention to the extraction effect and noise level. Constant gear control cannot adapt to different user usage conditions and flue resistance conditions, and the extraction effect and noise cannot be balanced. Currently, range hoods mainly use the following three common methods to change the extraction effect and noise:

[0004] Method 1: Use sensor feedback methods such as oil smoke sensors and sound pressure sensors to obtain the current status and adjust the fan's real-time working conditions to achieve intelligent adjustment;

[0005] Method 2: Intelligent adjustment is achieved by indirectly obtaining the amount of oil smoke generated by cooking and adjusting the real-time working conditions of the fan based on this amount. For example, the Chinese invention patent "A range hood and its air volume adjustment method and device" with application number CN 202211028568.5 (application publication number CN 115388443A) adopts an air outlet resistance information acquisition module to obtain the air outlet resistance information of the fan, so as to determine the operating gear of the fan according to the cooking scene information and the air outlet resistance information, thereby outputting an air volume that matches the amount of oil smoke generated by cooking, which can effectively reduce power consumption and avoid excessive noise;

[0006] Method three: Use active noise reduction and passive noise reduction measures to improve the noise of the range hood; such as the noise reduction device shown in the Chinese invention patent "A range hood with active and passive noise reduction devices and noise reduction method" with application number ZL201810781598.0 (authorization announcement number CN 108954443B).

[0007] However, the above solutions have the following limitations: the sensor feedback in method 1 has feedback hysteresis and is relatively costly;

[0008] Although the second method can ensure the smoke extraction effect, the smoke extraction effect and the noise experience are often contradictory, that is, the increase in working air volume will bring about a simultaneous increase in working noise, so this method cannot achieve the optimal noise reduction effect; although the third method can reduce noise, the additional equipment will increase the cost, and both methods one and three are prone to oil stickiness over time and gradually become ineffective.

[0009] Therefore, it is necessary to further improve the existing technology. Summary of the Invention

[0010] The first technical problem to be solved by the present invention is to provide a range hood control method that can control and adjust both the fume extraction effect and the noise in accordance with the above-mentioned prior art.

[0011] The second technical problem to be solved by the present invention is to provide a range hood using the above control method.

[0012] The technical solution adopted by the present invention to solve the first technical problem is: a range hood control method, characterized by comprising the following steps:

[0013] Step 1: collecting air volume values and operating noise values of the range hood at different operating currents and motor speeds, and fitting the relationship between the air volume value, the current value, and the speed value, as well as fitting the relationship between the operating noise value, the current value, and the speed value, to obtain a first functional relationship between the air volume value Q, the current value, and the speed value, and a second functional relationship between the operating noise value D, the current value, and the speed value;

[0014] Step 2: Collect the current working current i0 and motor speed N0 of the range hood, substitute the current working current i0 and motor speed N0 into the first functional relationship and the second functional relationship in step 1, and calculate the current working air volume value Q0 and working noise value D0;

[0015] Step 3: Compare the current working air volume value Q0 with the preset minimum air volume value Q min , air volume setting value Q S For comparison, Q min <Q S ;

[0016] Step 4: According to the comparison result obtained in step 3, the current working noise value D0 and the preset maximum value D of the noise value are selected accordingly. max , the noise value setting value D s and the preset minimum value D of the noise value min Compare at least one value in D min <D s <D max ;

[0017] Step 5: According to the comparison result obtained in step 4, the range hood is controlled to perform corresponding operations.

[0018] Preferably, the judgment logic in step 3 and step 4 is:

[0019] When Q0<Q min , then the current working noise value D0 is compared with the preset maximum noise value D max Make a comparison;

[0020] When Q min ≤Q0≤Q S , then the current working noise value D0 is compared with the preset maximum noise value D max And the noise level setting value D s Make a comparison;

[0021] When Q0>Q S , then the current working noise value D0 is compared with the preset minimum noise value D min And the noise level setting value D s Make a comparison.

[0022] Further preferably, when the current working noise value D0 is equal to the preset maximum noise value D max When performing the comparison, the judgment logic of step 5 is:

[0023] When D0≤D max , then gradually increase the working current of the range hood until the current working air volume value Q0 is the set value of the air volume Q S Or D0=D max ,Finish;

[0024] When D0>D max , then it ends.

[0025] Further preferably, when the current working noise value D0 is equal to the preset maximum noise value D max And the noise level setting value D s By comparison, the judgment logic of step 5 is:

[0026] When D0<D s , then gradually increase the working current of the range hood until the current working air volume value Q0 is the set value of the air volume Q S Or D0=D s ,Finish;

[0027] When D s ≤D0≤D max , the range hood maintains the current working state;

[0028] When D0>D max, then gradually reduce the operating current of the range hood until the current operating air volume value Q0 is Q min Or D0=D max ,Finish.

[0029] Further preferably, when the current working noise value D0 is equal to the preset minimum noise value D min And the noise level setting value D s By comparison, the judgment logic of step 5 is:

[0030] When D0<D min , the range hood maintains the current working state;

[0031] When D min ≤D0≤D s , then gradually reduce the working current of the range hood until the current working air volume value Q0 is the set value of the air volume Q S Or D0=D min ,Finish;

[0032] When D0>D s , then gradually reduce the working current of the range hood until the current working air volume value Q0 is the set value of the air volume Q S Or D0=D s ,Finish.

[0033] In order to balance the oil fume extraction effect and noise, instead of blindly pursuing the optimal solution of a certain indicator, the set value of the air volume Q S =x1*(Q max -Q min )+Q min , x1 is the preset first coefficient, 0<x1<1, Q max The preset maximum value for the air volume.

[0034] Preferably, the value of x1 is 0.5.

[0035] In order to balance the oil fume extraction effect and noise, the setting value of the noise value D s =x2*(D max -D min )+D min , x2 is the preset second coefficient, 0<x2<1.

[0036] Preferably, the value of x2 is 0.5.

[0037] In order to satisfy the user's experience, the preset maximum value D of the noise value max and the preset minimum value D of the noise value minThe default value set at the factory for the range hood and / or the operating current and motor speed under user-defined conditions where the range hood operating noise experience is satisfactory and does not meet the threshold are obtained by substituting the operating current and motor speed under the two conditions into the second functional relationship. The default value set at the factory for the range hood can meet the usage experience of most users. The preset maximum noise value D is calculated by using the operating current and motor speed under user-defined conditions where the range hood operating noise experience is satisfactory and does not meet the threshold. max and the preset minimum value D of the noise value min This approach can satisfy the user's personalized usage experience, thus meeting the needs of most users.

[0038] In order to make this control method closer to the actual user usage scenario, the operating noise value of the range hood in step 1 is obtained through laboratory standard kitchen testing.

[0039] Preferably, in step 1, a third-order multivariate function is used to fit the relationship between the air volume value, the current value and the speed value and / or to fit the relationship between the working noise value, the current value and the speed value.

[0040] The technical solution adopted by the present invention to solve the second technical problem is: a range hood, characterized in that: the operation is achieved by adopting the control method as described above.

[0041] Compared with the existing technology, the advantages of the present invention are: through a sensorless feedback method, the functional relationship between the air volume value, the current value and the speed value, as well as the functional relationship between the working noise value, the current value and the speed value, can be used to intelligently adjust the operating conditions of the range hood. Therefore, this method is low-cost, reliable and stable, and at the same time takes into account the air volume value and the working noise value to control the range hood to perform corresponding operations, thereby ensuring the cooking experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic diagram of a range hood test according to an embodiment of the present invention;

[0043] Figure 2 Flowchart of the range hood control method in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0045] like Figure 2 As shown, the range hood control method in this embodiment includes the following steps:

[0046] Step 1: collecting air volume values and operating noise values of the range hood at different operating currents and motor speeds, and fitting the relationship between the air volume value, the current value, and the speed value, as well as fitting the relationship between the operating noise value, the current value, and the speed value, to obtain a first functional relationship between the air volume value Q, the current value, and the speed value, and a second functional relationship between the operating noise value D, the current value, and the speed value;

[0047] In this embodiment, before the range hood leaves the factory, it is necessary to obtain and establish a database and relationship of the current (this current refers to the working current of the power board in the range hood), speed, real-time air volume, and working noise in a standard kitchen environment. The working noise test environment adopts a standard kitchen, such as Figure 1 As shown, the exhaust port of the range hood 1 exhausts smoke through a smoke pipe 3. A regulating valve 4 is provided at the tail end of the smoke pipe 3. A sound level meter probe 2 is provided on the range hood 1. Noise test points are set at designated locations for noise testing. By controlling the valve throttle 4 at the tail end, noise values are obtained when the range hood is operating at different current values and speeds. These noise values are closer to the actual noise values of users than those in a traditional semi-anechoic chamber.

[0048] Through the above test data, the discrete current value, speed value, air volume value and working noise value are obtained, and the least squares method is used to fit the air volume / working noise solution equation of no less than 3rd order;

[0049] The calculation formula for air volume value Q and working noise value D is:

[0050] Q=F1(i,N), D=F2(i,N),

[0051] Where i is the current value, N is the speed value, F1(.) is the functional relationship between the air volume value Q and the current value and the speed value, and F2(.) is the functional relationship between the working noise value D and the current value and the speed value;

[0052] The current real-time air volume and working noise can be obtained through the current and speed feedback on the power board in the user environment. In this embodiment, when a third-order multivariate function is used for fitting, the equation can be expressed as follows: Q = (a1*N 3 +b1*N 2 +c1*N+d1)*(m1*i+n1), D=(a2*N 3 +b2*N 2 +c2*N+d2)*(m2*i+n2), the above a1, b1, c1, d1, m1, n1, a2, b2, c2, d2, m2 and n2 are all fitting coefficients, and each coefficient is a constant;

[0053] Step 2: Collect the current operating current i0 and motor speed N0 of the range hood, substitute the current operating current i0 and motor speed N0 into the first functional relationship and the second functional relationship in step 1, respectively, to calculate the current operating air volume value Q0 and the operating noise value D0. In this embodiment, the operating current and motor speed of the range hood can be collected using sensors or other methods in the prior art, which will not be further described here.

[0054] Step 3: Compare the current working air volume value Q0 with the preset minimum air volume value Q min , air volume setting value Q S For comparison, Q min <Q S ;

[0055] Step 4: According to the comparison result obtained in step 3, the current working noise value D0 and the preset maximum value D of the noise value are selected accordingly. max , the noise value setting value D s and the preset minimum value D of the noise value min Compare at least one value in D min <D s <D max ;

[0056] In this embodiment, when Q0<Q min , indicating that the working air volume is too low and the fume extraction effect is poor. At this time, the current value is increased to the maximum tolerable noise value D max The current working noise value D0 is equal to the preset maximum value D of the noise value. max Make a comparison;

[0057] When Q min ≤Q0≤Q S , indicating that the working air volume is in the appropriate range, but is less than the set value. At this time, the set value of the working noise is combined to judge and achieve the best experience effect. The current working noise value D0 is compared with the preset maximum value D of the noise value. max And the noise level setting value D s Make a comparison;

[0058] When Q0>Q S , indicating that the working air volume is too large and the working noise needs to be considered, then the current working noise value D0 is compared with the preset minimum value D min And the noise level setting value D s Make a comparison;

[0059] Step 5: According to the comparison result obtained in step 4, the range hood is controlled to perform corresponding operations;

[0060] In this embodiment, the current working noise value D0 is compared with the preset maximum noise value Dmax The judgment logic for comparison is:

[0061] When D0≤D max , then gradually increase the working current of the range hood until the current working air volume value Q0 is the set value of the air volume Q S Or D0=D max ,Finish;

[0062] When D0>D max , at this time, the noise has exceeded the user setting, and the current remains unchanged. In this case, it is recommended that the user change the threshold or check the flue blockage, then end;

[0063] The current working noise value D0 is compared with the preset maximum noise value D max And the noise level setting value D s The judgment logic for comparison is:

[0064] When D0<D s , then gradually increase the working current of the range hood until the current working air volume value Q0 is the set value of the air volume Q S Or D0=D s ,Finish;

[0065] When D s ≤D0≤D max , the range hood maintains the current working state;

[0066] When D0>D max , then gradually reduce the operating current of the range hood until the current operating air volume value Q0 is Q min Or D0=D max ,Finish;

[0067] The current working noise value D0 is compared with the preset minimum noise value D min And the noise level setting value D s The judgment logic for comparison is:

[0068] When D0<D min , the range hood maintains the current working state;

[0069] When D min ≤D0≤D s , then gradually reduce the working current of the range hood until the current working air volume value Q0 is the set value of the air volume Q S Or D0=D min , you can have a better noise experience, end;

[0070] When D0>D s , then gradually reduce the working current of the range hood until the current working air volume value Q0 is the set value of the air volume Q SOr D0=D s , do not choose to drop to D at this time min Because D s It is the average noise level generally accepted by users, which can provide a better experience of oil fume absorption. min This will require sacrificing more working air volume; end.

[0071] In each of the above steps, before the end, the current value may be maintained for a fixed time before proceeding to step 2. The fixed time may be 1 minute.

[0072] The preset maximum value of the noise value D max and the preset minimum value D of the noise value min The default values set when the range hood leaves the factory and / or the operating current and motor speed under user-defined range hood operating noise experience satisfactory and unsatisfactory threshold working conditions are obtained by substituting the operating current and motor speed under the two working conditions into the second functional relationship.

[0073] Specifically, the range hood effect of the user's home is closely related to the working air volume of the range hood itself. It is also affected by the installation environment of the user's home and the resistance of the flue. At the beginning of the installation and use of the range hood, the user can customize the acceptance value of the range hood effect and the noise acceptance value according to individual needs. The program sets the Q default range (Q min , Q max ), such as (10m 3 / min, 15m 3 / min), and D default interval (D min , D max ), such as (58dB, 70dB). Depending on the user's home installation environment and their own user experience, if the user is dissatisfied with the default experience, they can determine the threshold point based on their actual needs. Because the operating noise level and operating air volume are related, when setting the threshold for both, the operating noise level at the minimum operating air volume value must not exceed the upper threshold for the setting to be successful.

[0074] Taking operating noise as an example, the specific method is to turn on the range hood and adjust its speed or gear continuously. Two threshold operating conditions are defined for satisfactory and unsatisfactory noise experience. Using the built-in fitting function relationship, the operating noise threshold range is obtained and replaced with the default range. This meets the needs of users in different scenarios and better meets their respective usage experience. Due to the influence of the range hood usage time and external factors, the user can be asked to change this setting at a set interval, such as every six months.

[0075] The fume extraction effect and noise experience are often contradictory. That is, the increase in working air volume will bring about a simultaneous increase in working noise. Therefore, we should not blindly pursue the optimal solution of a certain indicator, but should make a trade-off. S and Ds, the set value of the working air volume Q S =x1*(Q max -Q min )+Q min , x1 is the preset first coefficient, 0<x1<1, Q max The preset maximum value of air volume; the setting value of noise value D s =x2*(D max -D min )+D min , x2 is the preset second coefficient, 0<x2<1; the preferred coefficients x1 and x 2均 is 0.5.

[0076] This embodiment also involves a range hood, which adopts the above-mentioned control method to realize operation, so that the range hood can simultaneously adjust the air volume value and the working noise value to improve the user experience.

Claims

1. A range hood control method, characterized in that The steps include: Step 1: collecting air volume values and operating noise values of the range hood at different operating currents and motor speeds, and fitting the relationship between the air volume value, the current value, and the speed value, as well as fitting the relationship between the operating noise value, the current value, and the speed value, to obtain a first functional relationship between the air volume value Q, the current value, and the speed value, and a second functional relationship between the operating noise value D, the current value, and the speed value; Step 2: Collect the current working current i0 and motor speed N0 of the range hood, substitute the current working current i0 and motor speed N0 into the first functional relationship and the second functional relationship in step 1, and calculate the current working air volume value Q0 and working noise value D0; Step 3: Compare the current working air volume value Q0 with the preset minimum air volume value Q min , air volume setting value Q S For comparison, Q min <Q S ; Step 4: According to the comparison result obtained in step 3, the current working noise value D0 and the preset maximum value D of the noise value are selected accordingly. max , the noise value setting value D s and the preset minimum value D of the noise value min Compare at least one value in D min <D s <D max ; Step 5: According to the comparison result obtained in step 4, the range hood is controlled to perform corresponding operations.

2. The range hood control method according to claim 1, wherein: The judgment logic in step 3 and step 4 is: When Q0<Q min , then the current working noise value D0 is compared with the preset maximum noise value D max Make a comparison; When Q min ≤Q0≤Q S , then the current working noise value D0 is compared with the preset maximum noise value D max And the noise level setting value D s Make a comparison; When Q0>Q S , then the current working noise value D0 is compared with the preset minimum noise value D min And the noise level setting value D s Make a comparison.

3. The range hood control method according to claim 2, wherein: The current working noise value D0 and the preset maximum noise value D max When performing the comparison, the judgment logic of step 5 is: When D0≤D max , then gradually increase the working current of the range hood until the current working air volume value Q0 is the set value of the air volume Q S Or D0=D max ,Finish; When D0>D max , then it ends.

4. The range hood control method according to claim 2, wherein: The current working noise value D0 and the preset maximum noise value D max And the noise level setting value D s By comparison, the judgment logic of step 5 is: When D0<D s , then gradually increase the working current of the range hood until the current working air volume value Q0 is the set value of the air volume Q S Or D0=D s ,Finish; When D s ≤D0≤D max , the range hood maintains the current working state; When D0>D max , then gradually reduce the operating current of the range hood until the current operating air volume value Q0 is Q min Or D0=D max ,Finish.

5. The range hood control method according to claim 2, wherein: The current working noise value D0 and the preset minimum noise value D min And the noise level setting value D s By comparison, the judgment logic of step 5 is: When D0<D min , the range hood maintains the current working state; When D min ≤D0≤D s , then gradually reduce the working current of the range hood until the current working air volume value Q0 is the set value of the air volume Q S or D 0＝ D min ,Finish; When D0>D s , then gradually reduce the working current of the range hood until the current working air volume value Q0 is the set value of the air volume Q S or D 0＝ D s ,Finish.

6. The range hood control method according to any one of claims 1 to 5, characterized in that: The set value Q of the air volume S =x1*(Q max -Q min )+Q min , x1 is the preset first coefficient, 0<x1<1, Q max The preset maximum value for the air volume.

7. The range hood control method according to claim 6, characterized in that: The value of x1 is 0.

5.

8. The range hood control method according to claim 6, wherein: The set value D of the noise value s =x2*(D max -D min )+D min , x2 is the preset second coefficient, 0<x2<1.

9. The range hood control method according to claim 8, characterized in that: The value of x2 is 0.

5.

10. The range hood control method according to any one of claims 1 to 5, characterized in that: The preset maximum value D of the noise value max and the preset minimum value D of the noise value min The default values set when the range hood leaves the factory and / or the operating current and motor speed under user-defined range hood operating noise experience satisfactory and unsatisfactory threshold working conditions are obtained by substituting the operating current and motor speed under the two working conditions into the second functional relationship.

11. The range hood control method according to any one of claims 1 to 5, characterized in that: The operating noise value of the range hood in step 1 is obtained through laboratory standard kitchen testing.

12. The range hood control method according to claim 11, characterized in that: In the step 1, a third-order multivariate function is used to fit the relationship between the air volume value, the current value and the speed value and / or to fit the relationship between the working noise value, the current value and the speed value.

13. A range hood, characterized in that: The operation is achieved by adopting the control method as described in any one of claims 1 to 12 above.

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