Range hood, control method thereof, filter replacement method and device

Abstract

The application discloses an extractor hood, a control method thereof, a filter replacement method and device. The method is applied to the extractor hood, the extractor hood comprises a filter arranged at an air inlet of the extractor hood, and the method comprises the following steps: acquiring illumination information of the filter; wherein the illumination information represents an oil fume condition; judging whether the illumination information meets a filter replacement condition; when the judgment result is yes, replacing the filter and / or prompting filter replacement information. The application can accurately identify the oil stain accumulation condition of the filter based on the illumination information of the filter, automatically replace the filter, and is convenient to operate. Moreover, the filter can be effectively replaced in time, so that the use effect of the extractor hood is not affected by the failure to replace the filter in time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent household appliances, and in particular to an extractor hood, a control method thereof, and a filter replacement method and device. BACKGROUND

[0002] An extractor hood is an essential appliance for people to use in cooking and oil fume extraction. Products with smoke stove linkage or intelligent start-up and wind volume adjustment functions have become increasingly popular in recent years. Currently, some users gradually use disposable filters (e.g., filter paper) to protect the extractor hood, and filter and intercept at the front end of the fan. However, whether the filter needs to be replaced is determined by the user. If the filter is replaced frequently, it will result in waste of the filter. If the filter is not replaced in time, it will affect the use of the extractor hood. SUMMARY

[0003] The present application aims to overcome the above-mentioned defects in the prior art and provide an extractor hood, a control method thereof, and a filter replacement method and device.

[0004] The present application solves the above-mentioned technical problems by the following technical solutions:

[0005] In a first aspect, a filter replacement method is provided and applied to an extractor hood. The extractor hood includes a filter arranged at an air inlet of the extractor hood. The method includes the following steps:

[0006] Obtaining illumination information of the filter, wherein the illumination information represents an oil fume condition;

[0007] Determining whether the illumination information meets a filter replacement condition;

[0008] When the determination result is yes, replacing the filter and / or prompting filter replacement information.

[0009] Optionally, the extractor hood includes a photoelectric sensor. The determination of whether the illumination information meets the filter replacement condition includes the following steps:

[0010] Obtaining at least two electrical signals output by the photoelectric sensor in sequence, wherein the electrical signals are converted from the illumination information by the photoelectric sensor;

[0011] Determining whether the illumination information meets the filter replacement condition according to the at least two electrical signals.

[0012] Optionally, the determination of whether the illumination information meets the filter replacement condition includes the following steps:

[0013] Determining an operating state of the extractor hood;

[0014] Determining a filter replacement condition matched with the operating state;

[0015] determine whether the illumination information meets a filter replacement condition matched with the operation state.

[0016] Optionally, when the operation state is the shutdown state, the filter replacement condition comprises a first preset range; when the operation state is the running state, the filter replacement condition comprises a second preset range.

[0017] The determination of whether the illumination information meets the filter replacement condition comprises:

[0018] When the operation state is the shutdown state, it is determined whether a feature value of an illumination feature contained in the illumination information falls within the first preset range.

[0019] When the operation state is the running state, it is determined whether a feature value of an illumination feature contained in the illumination information falls within the second preset range.

[0020] Optionally, the filter replacement condition comprises a preset change rate; the determination of whether the illumination information meets the filter replacement condition comprises:

[0021] It is determined whether a change rate of an illumination feature contained in the illumination information meets the preset change rate.

[0022] Optionally, the filter is a flexible filter; the range hood further comprises a first storage roller and a second storage roller arranged opposite to the first storage roller; the first storage roller is configured to store unused filters, and the second storage roller is configured to store used filters; the replacement of the filter comprises:

[0023] Controlling the first storage roller and the second storage roller to rotate in the same direction, and the second storage roller to rotate along the direction of the first storage roller, so as to replace the filter.

[0024] In a second aspect, a control method of a range hood is provided, comprising:

[0025] According to the filter replacement method of the first aspect, the filter on the range hood is controlled to be replaced.

[0026] Optionally, further comprising:

[0027] According to the illumination information, an operation strategy is matched;

[0028] Based on the operation strategy, the range hood is controlled to operate.

[0029] In a third aspect, a filter replacement device is provided, applied to a range hood, the range hood comprising a filter arranged at an air inlet of the range hood, the device comprising:

[0030] An acquisition module is configured to acquire illumination information of the filter element, wherein the illumination information represents an oil fume condition.

[0031] A judgment module is configured to judge whether the illumination information meets a filter element replacement condition.

[0032] A processing module is configured to replace the filter element and / or prompt filter element replacement information when the judgment result is yes.

[0033] In a fourth aspect, an oil fume extractor is provided, which comprises a memory, a processor, and a computer program stored in the memory and configured to run on the processor, wherein the processor implements the method of the first aspect or the second aspect when the computer program is executed.

[0034] On the basis of common knowledge in the art, the above-mentioned preferred conditions can be combined arbitrarily, thereby obtaining preferred examples of the present application.

[0035] The present application has the following positive progress effects: the present application can accurately identify the oil accumulation condition of the filter element based on the illumination information of the filter element, automatically replace the filter element, and is convenient to operate. Moreover, the filter element can be replaced in time and effectively, thereby avoiding the influence of the filter element on the use effect of the oil fume extractor. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 FIG. 1 is a structural schematic diagram of an oil fume extractor according to an example embodiment of the present application;

[0037] Figure 2 FIG. 2 is a flowchart of a filter element replacement method according to an example embodiment of the present application;

[0038] Figure 3 FIG. 3 is an illumination effect schematic diagram of a filter element not contacting water or oil according to an example embodiment of the present application;

[0039] Figure 4 FIG. 4 is an effect schematic diagram of a filter element contacting water or oil according to an example embodiment of the present application;

[0040] Figure 5 FIG. 5 is an illumination effect schematic diagram of a filter element contacting water or oil according to an example embodiment of the present application;

[0041] Figure 6 FIG. 6 is an effect schematic diagram of a filter element contacting water or oil according to an example embodiment of the present application;

[0042] Figure 7A schematic diagram of photoelectric sensor same side receiving and opposite direction receiving of a control method of a range hood is provided for an exemplary embodiment of the present application;

[0043] Figure 8 A flow chart of a control method of a range hood is provided for an exemplary embodiment of the present application;

[0044] Figure 9 A flow chart of another control method of a range hood is provided for an exemplary embodiment of the present application;

[0045] Figure 10 A flow chart of another control method of a range hood is provided for an exemplary embodiment of the present application;

[0046] Figure 11 A flow chart of another control method of a range hood is provided for an exemplary embodiment of the present application;

[0047] Figure 12 A module schematic diagram of a filter replacement device is provided for an exemplary embodiment of the present application;

[0048] Figure 13 A structure schematic diagram of a range hood is provided for an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0049] The present application is further illustrated by the following examples without limiting the present application to the examples.

[0050] An exemplary filter replacement method is provided for a range hood in an embodiment of the present application, referring to Figure 1 The range hood includes a fan 61, a filter 31 arranged at an air outlet, a smoke collecting cover 65, and various required sensors. Oil fume enters the fan frame from the air outlet of the smoke collecting cover, and is filtered by the filter before entering the fan. Most of the oil stains are filtered and adhered to the filter, which ensures long-term cleanliness of the fan. Of course, the range hood can also include other required devices, which are not described here. The material of the filter can be set according to actual conditions, such as filter paper, stainless steel, etc.

[0051] In one embodiment, the range hood includes a photoelectric sensor, the photoelectric sensor is located at the air outlet of the range hood, the emitting end 63 and the receiving end 69 of the photoelectric sensor are installed on the side of the range hood, oil fume enters the fan frame from the smoke collecting cover 65 of the range hood, and is filtered by the filter 31 of the drum before entering the fan 61. The airflow 68 before filtering passes through the filter, becomes the airflow 611 after filtering, most of the oil fume is filtered and adhered to the filter 31, which ensures long-term cleanliness of the fan 61. The total material air gap of the filter is replaced by water or oil, the transmitted light 610 changes, and the illumination characteristics change.

[0052] Figure 2 A flow chart of a filter replacement method is provided for an exemplary embodiment of the present application, which comprises the following steps:

[0053] Step 201, obtaining illumination information of the filter.

[0054] The illumination information represents the oil fume condition. The oil stain accumulated on the filter will change the illumination information of the filter, so the illumination information of the filter can represent the oil fume condition.

[0055] Step 202, judging whether the illumination information meets the filter replacement condition.

[0056] The filter replacement condition is set according to experience. When the illumination information meets the filter replacement condition, it means that the filter has accumulated more oil stain.

[0057] If the result of step 202 is yes, it means that the filter has accumulated more oil stain and needs to be replaced, then step 203 is executed; if the result of step 202 is no, it means that the filter has not accumulated enough oil stain to meet the replacement condition, then no action is taken or other control actions unrelated to filter replacement are performed on the range hood.

[0058] Step 203, replacing the filter.

[0059] In order to realize automatic replacement of the filter, in an embodiment, referring to Figure 1 , the range hood is further provided with a first storage roller 67 and a second storage roller 64, the first storage roller 67 is arranged opposite to the second storage roller 64, the first storage roller is used to store unused filters, the second storage roller is used to store used filters, and automatic replacement of the filter can be realized by controlling the rotation of the first storage roller and the second storage roller. Specifically, the first storage roller and the second storage roller are controlled to rotate in the same direction, and the second storage roller rotates in the direction of the first storage roller. The unused filter stored in the first storage roller extends in the direction of the second storage roller during the rotation of the first storage roller, and the used filter is stored in the second storage roller during the rotation of the second storage roller, thereby realizing replacement of the filter.

[0060] In an embodiment, the range hood is further provided with a support 66 to support the filter.

[0061] In the embodiment of the present application, the illumination information of the filter can accurately identify the accumulation of oil stain on the filter, and the filter can be automatically replaced, which is convenient to operate. Moreover, the filter can be replaced in time and effectively, so as to avoid affecting the use effect of the range hood due to failure to replace the filter in time.

[0062] In one embodiment, step 203 is replaced by step 203'.

[0063] Step 203', prompting filter replacement information. To remind the user to replace the filter in time.

[0064] The filter replacement information can be prompted by voice broadcast, SMS, sound and light alarm, display on the display screen, etc. The filter replacement information can include the replacement time, replacement frequency, and remaining amount of the filter, but is not limited thereto.

[0065] In the embodiment of the present application, the light information of the filter can accurately identify the oil accumulation of the filter, timely and effectively remind the user to replace the filter, and on the one hand, can avoid waste of the filter caused by frequent replacement, and on the other hand, can avoid affecting the use effect of the range hood caused by untimely replacement.

[0066] In one embodiment, the filter replacement information is also prompted when the filter is replaced. To inform the user that the filter has been replaced, and can be used with confidence.

[0067] In one embodiment, the light information is collected by a photoelectric sensor arranged on the range hood. The photoelectric sensor can convert the collected light signal into an electrical signal that is easy to process. In step 202, it is determined whether the electrical signal meets the filter replacement condition.

[0068] It can be understood that the photoelectric sensor periodically collects the light information of the filter, and converts each collected light information into an electrical signal representing the light feature. In step 202, whether the light information meets the filter replacement condition is determined based on at least two electrical signals output by the photoelectric sensor in sequence. The collection period of the photoelectric sensor can be set according to actual conditions.

[0069] Taking two electrical signals as an example, the first electrical signal and the second electrical signal are two electrical signals output by the photoelectric sensor at the two time points closest to the current time. The first electrical signal and the second electrical signal can accurately reflect the oil accumulation of the filter. In step 202, whether the light information meets the filter replacement condition is determined based on the first electrical signal and the second electrical signal.

[0070] In the embodiment of the present application, whether the filter replacement condition is met is determined based on at least two electrical signals. Compared with determining based on the current electrical signal, the accuracy is higher, and the oil accumulation on the filter can be more accurately identified, and the interference caused by water vapor accumulated on the filter can be excluded.

[0071] Through experiments, it is found that when the range hood is in different operating states, different filter replacement conditions are set, and the accuracy is higher. Therefore, the filter replacement condition is determined according to different operating states.

[0072] In one embodiment, a running state of the range hood is determined, and a filter replacement condition matching the running state is determined, and it is determined whether the illumination information meets the filter replacement condition matching the running state.

[0073] When the running state is the shutdown state, the filter replacement condition includes a first preset range; when the running state is the running state, the filter replacement condition includes a second preset range.

[0074] When the running state is the shutdown state, it is determined whether a feature value of an illumination feature contained in the illumination information falls within the first preset range. If the feature value of the illumination feature falls within the first preset range, step 203 and / or step 203' are executed. Otherwise, no action is taken or other control actions unrelated to filter replacement are performed on the range hood.

[0075] When the running state is the running state, it is determined whether a feature value of an illumination feature contained in the illumination information falls within the second preset range. If the feature value of the illumination feature falls within the second preset range, step 203 and / or step 203' are executed. Otherwise, no action is taken or other control actions unrelated to filter replacement are performed on the range hood.

[0076] The above-mentioned illumination feature includes, but is not limited to, at least one of the transmittance, reflectance, refractive index, and system light source information of the filter. It can be understood that the filter replacement condition is different when different illumination features are used.

[0077] Taking two electrical signals and the refractive index as an example, assuming that the first preset range is [S2, +∞), when the amplitudes of the first electrical signal and / or the second electrical signal fall within the first preset range [S2, +∞), i.e., as long as one of the first electrical signal and the second electrical signal falls within the first preset range [S2, +∞), it is considered that the filter is saturated and cannot absorb oil fume any more, and the filter replacement action must be triggered, then step 103 and / or step 103' are executed. Otherwise, no action is taken or other control actions unrelated to filter replacement are performed on the range hood.

[0078] Assuming that the second preset range is [S3, +∞), when the amplitudes of the first electrical signal and / or the second electrical signal fall within the second preset range [S3, +∞), i.e., as long as one of the first electrical signal and the second electrical signal falls within the second preset range [S3, +∞), it is considered that the filter is saturated and cannot absorb oil fume any more, and the filter replacement action must be triggered, then step 103 and / or step 103' are executed. Otherwise, no action is taken or other control actions unrelated to filter replacement are performed on the range hood.

[0079] S3 > S2. Because the filter material to be replaced needs to ensure that the next time it can automatically control the hood to start based on the light information, the filter material replacement condition requires a more stringent S2. The filtering capacity during use mainly considers the ability to act as a sensor medium, which can be judged under the off condition. This can make more full use of the filter material while retaining the ability of the hood to automatically turn on and off based on light information. In one embodiment, the filter replacement condition includes a preset change rate; in step 102, it is determined whether the change rate of the light feature contained in the light information meets the preset change rate. The change rate of the light feature can more accurately identify the accumulation of oil stains.

[0080] Taking filter paper as the filter element and the refractive index as the light feature, for example, the refractive index of the filter paper will change after it contacts or soaks up the water vapor or oil stains during cooking. The unused filter paper is not transparent, mainly because the light is scattered significantly when it passes through the fiber-air and air-filler interfaces. The refractive indices of fiber, air, and filler are different (refractive index: water 1.33, air 1.0, fiber 1.53, filler calcium carbonate 1.56, talc 1.57, titanium dioxide 2.55, and edible oil 1.47). The greater the difference in refractive index, the more obvious the scattering, and the weaker the light transmission. The smaller the difference, the stronger the light transmission.

[0081] As shown in Figure 3 , when the filter element is unused and does not contact or soak up water and oil, the fiber 22 and the filler 23 are mainly filled with air 21. The arrow represents the emission information of the light source. Most of the light is scattered, and the transmitted light is very small, the light transmission rate is weak, and the filter element 31 is in a state of not contacting or drying after the water vapor. As shown in Figure 4 , the transparency of the filter element is high. As shown in Figure 5 , when water or oil 41 (edible oil droplets) accumulates on the filter element, the water or oil 41 will soak and fill the pores between the fibers 22 of the filter element. Compared with air 21, the refractive index of water and oil 41 is closer to the fiber and filler 23, the light scattering is weakened, the transmitted light is increased, the light transmission rate is strong, and the light transmission rate of the filter element 31 after contacting oil is increased. As shown in Figure 6 , the transparency of the filter element is high. Compared with oil, the difference between the refractive index of water and the fiber and filler is greater, so the light transmission rate will decrease. The light information of the filter element can be used to determine whether it is in a wok cooking or steaming cooking state, identify the accumulation of oil stains, and determine whether the filter element needs to be replaced.

[0082] According to the test, the water vapor generated during steaming cooking evaporates after the cooking stops and shuts down for a period of time, so that the filter element basically returns to its original state. That is, the light feature is not constant throughout the cooking process. The change rate of the light feature can more accurately identify the accumulation of oil stains and accurately identify the timing of replacing the filter element.

[0083] In one embodiment, the photoelectric sensor can include a transmitting end and an output end, the transmitting end emits light source to the filter, and the output end receives light information reflected and / or refracted by the filter for the light source. The change of the refractive index also causes the change of the reflectivity and the light transmittance of the interface of the filter, and the reflectivity decreases and the transmittance increases after absorbing water or oil. As shown in Figure 7 The transmitting end of the light source is 71, the photoelectric sensor receives 72 on the same side, and the filter is immersed in water or oil 41. When the transmitted light increases, the value of the same side receiving 72 decreases. The photoelectric sensor receives 73 in the opposite direction, and the filter is immersed in water or oil 41. When the transmitted light increases, the value of the opposite direction receiving 73 increases, that is, the reflectivity decreases and the transmittance increases after absorbing oil or water.

[0084] The embodiment of the present application also provides a control method of the range hood, which comprises: controlling the replacement of the filter on the range hood according to the filter replacement method provided by any of the above embodiments.

[0085] In one embodiment, the method further comprises matching the operation strategy according to the light information, and controlling the operation of the range hood based on the operation strategy.

[0086] The light information can also represent the oil fume condition in the environment. By using the change of the light information such as the refractive index of the filter after contacting or immersing the water vapor or oil stain in the cooking process, the operation strategy of the range hood is matched, for example, the range hood is turned on or off, or the gear is adjusted, and the filter can also be automatically identified and replaced, the composite application of the filter is realized, and the ability of intercepting oil fume and the intelligent level of the range hood are improved.

[0087] In one embodiment, the range hood comprises a photoelectric sensor, and the operation strategy is matched according to the light information of the filter, which comprises:

[0088] At least two electrical signals output by the photoelectric sensor in sequence are obtained, wherein the electrical signals are obtained according to the light information; and the operation strategy is matched according to the electrical signals.

[0089] It can be understood that the photoelectric sensor periodically collects the light information of the filter, and converts the light information collected each time into an electrical signal representing the light characteristics. The electrical signal can be two electrical signals output by the photoelectric sensor at the two time points closest to the current time. The collection period of the photoelectric sensor can be set by itself according to the actual situation.

[0090] The change of the refractive index also causes the change of the reflectivity and the light transmittance of the interface of the filter, and the reflectivity decreases and the transmittance increases after absorbing water or oil. As shown in Figure 7As shown, 71 is the emission end of the light source, the same side receiving 72 is reflective, when the filter is immersed in water or oil 41, the transmitted light increases, and the value of the same side receiving 72 decreases; while the opposite direction receiving 73 of the photoelectric sensor is transmissive, when the filter is immersed in water or oil 41, the transmitted light increases, and the value of the opposite direction receiving 73 increases, that is, the reflectivity decreases after absorbing oil or water, and the transmissivity increases.

[0091] At least two electrical signals output by the photoelectric sensor are obtained, wherein the interval between the two electrical signals is a first time length threshold, by obtaining the electrical signals at two time points, the light information of the filter at different times is obtained, and the operation strategy of the range hood is matched according to the change of the light information, so as to improve the identification ability of the oil fume and the control accuracy of the range hood.

[0092] In one embodiment, the electrical signal includes a first electrical signal and a second electrical signal, and matching the operation strategy according to the electrical signal includes:

[0093] The first electrical signal and the second electrical signal are compared with a threshold value; wherein the threshold value includes a first threshold value and a second threshold value, the first threshold value is not greater than the second threshold value, when the first electrical signal is not less than the first threshold value and the first electrical signal is less than the second threshold value, the range hood is started or switched to a low gear, and when the first electrical signal or the second electrical signal is not less than the second threshold value, the range hood is started or switched to a high gear, for example, when the first electrical signal is M1, the second electrical signal is M2, the first threshold value is S1, and the second threshold value is S2, the condition for starting or switching the range hood to a low gear is S1≤M1<S2.

[0094] In one embodiment, the electrical signal includes a first electrical signal and a second electrical signal, and matching the operation strategy according to the electrical signal includes:

[0095] The first electrical signal and the second electrical signal are compared with a threshold value; wherein the threshold value includes a first threshold value and a second threshold value, the first threshold value is not greater than the second threshold value, when the second electrical signal is not less than the first threshold value and the second electrical signal is less than the second threshold value, the range hood is started or switched to a low gear, and when the first electrical signal or the second electrical signal is not less than the second threshold value, the range hood is started or switched to a high gear, for example, when the first electrical signal is M1, the second electrical signal is M2, the first threshold value is S1, and the second threshold value is S2, the condition for starting or switching the range hood to a low gear is S1≤M2<S2.

[0096] In one embodiment, the electrical signal includes a first electrical signal and a second electrical signal, and matching the operation strategy according to the electrical signal includes:

[0097] comparing the first electric signal and the second electric signal with a threshold value; wherein the threshold value comprises a first threshold value and a second threshold value, the first threshold value is not greater than the second threshold value, when the first electric signal and the second electric signal are not less than the first threshold value and the first electric signal and the second electric signal are less than the second threshold value, the range hood is started or switched to a low gear, when the first electric signal or the second electric signal is not less than the second threshold value, the range hood is started or switched to a high gear, for example, when the first electric signal is M1, the second electric signal is M2, the first threshold value is S1, and the second threshold value is S2, the condition for starting or switching the range hood to the low gear is S1≤M1<S2 and S1≤M2<S2.

[0098] When the value of the electric signal is not less than the first threshold value, it indicates that the oil fume is small, it is judged that water vapor is immersed, and it is a cooking mode, the range hood is started or switched to a low gear; when the value of the electric signal is not less than the second threshold value, it indicates that the oil fume is large, it is judged that there is obvious oil fume, and it is a stir-frying cooking mode, the range hood is started or switched to a high gear.

[0099] The first threshold value and the second threshold value are set according to actual conditions.

[0100] In an embodiment, the threshold value further comprises a third threshold value and a fourth threshold value, when the range hood is in a starting state, the matching operation strategy according to the electric signal further comprises:

[0101] When the first electric signal and the second electric signal are not greater than the first threshold value, and the difference between the first electric signal and the second electric signal is not less than the fourth threshold value, the range hood is kept or switched to a low gear; when the first electric signal or the second electric signal is not less than the second threshold value, and the first electric signal or the second electric signal is less than the third threshold value, the range hood is kept or switched to a high gear.

[0102] When the electric signal is not less than the second threshold value, it indicates that the oil fume is large, at this time, the third threshold value is added for judgment, to further judge whether the filter is saturated, if saturated, it will lose further filtering capacity, and the filter needs to be automatically replaced during cooking use to continue to maintain the filtering capacity.

[0103] The third threshold value and the fourth threshold value are set according to actual conditions, when the receiving end and the emitting end of the photoelectric sensor are arranged on the opposite sides of the filter, if the first threshold value is S1, the second threshold value is S2, the third threshold value is S3, and the fourth threshold value is Sk, the relationship between the threshold values is S1≤S2≤S3, and Sk≥S1; when the receiving end and the emitting end of the photoelectric sensor are arranged on the same side of the filter, if the first threshold value is P1, the second threshold value is P2, and the third threshold value is P3, the relationship between the threshold values is P3≤P1≤P2.

[0104] In an embodiment, it further comprises: judging whether the filter replacement condition is met according to the at least two electric signals; when the judgment result is yes, replacing the filter.

[0105] In one embodiment, further comprising: judging whether the filter replacement condition is met according to the at least two electrical signals, and prompting the filter replacement information when the judging result is yes.

[0106] In one embodiment, further comprising: judging whether the filter replacement condition is met according to the at least two electrical signals, and replacing the filter and prompting the filter replacement information when the judging result is yes.

[0107] The existing range hood uses a disposable filter to filter and intercept at the front end of the fan, and the need for filter replacement is also lack of automatic judgment and replacement. In the embodiment of the application, the state of the filter is obtained according to the light information, i.e. electrical signals, of the filter, and the filter replacement condition is judged according to the state of the filter, thereby improving the accuracy of judging the filter replacement, replacing the filter or prompting the filter replacement information, and keeping the range hood in good filtering capacity.

[0108] In one embodiment, further comprising: determining the running state of the range hood, determining the filter replacement condition matched with the running state, and judging whether the at least two electrical signals meet the filter replacement condition matched with the running state.

[0109] The running state of the range hood includes but is not limited to turning on, standby, turning off, running, etc. The filter replacement condition is matched according to different running states of the range hood, thereby improving the accuracy of replacing the filter. For example, when the range hood is in the turning-on state, one of the filter replacement conditions is that the two electrical signals are less than the second threshold value, so as to ensure that the filter is not affected by oil stains to judge the light information during the use of the range hood, and to ensure the filtering capacity of the range hood.

[0110] In one embodiment, when the range hood is in the turning-on state, the running strategy matched according to the electrical signals further comprises:

[0111] When the first electrical signal and the second electrical signal are not less than the second threshold value, the filter of the range hood is replaced, and the range hood is turned off; and when the first electrical signal and the second electrical signal are less than the second threshold value, the range hood is turned off.

[0112] The filter to be replaced in the turning-off state needs to ensure that the next time it can be automatically detected and then turned on. The second threshold value is selected as the condition for replacing the filter. The second threshold value is not greater than the third threshold value. If the first electrical signal and the second electrical signal are not less than the second threshold value, it means that the oil fume is large, which affects the next turning-on judgment, and the filter needs to be replaced, thereby ensuring the filtering capacity of the range hood and fully utilizing the filter while retaining the automatic turning-on and turning-off capability of the range hood.

[0113] S13, controlling the range hood to run based on the running strategy.

[0114] Based on at least two electrical signals obtained by the photoelectric sensor, the light information of the filter is determined, and the opening, gear shifting and replacement of the range hood are determined according to the change of the light information.

[0115] The control method of the range hood will be further described below by taking a specific example: Figure 8 And Figure 9 , a specific example of the control method of the range hood is further described:

[0116] The receiving end and the transmitting end of the sensor are arranged on the opposite sides of the filter. When there is water vapor and oil, the refraction index difference decreases after the water vapor is absorbed, and the light transmission is stronger. The refraction index of oil is closer to other fillings than that of water, and the light transmission is stronger. After the water vapor evaporates and the filter is dried, the refraction index difference in the filter increases, and the light transmission ability becomes weaker.

[0117] As shown in Figure 8 , when the range hood is in a standby state, if no start signal is detected, the receiving and transmitting ends of the photoelectric sensor operate at a low frequency and low power consumption. At this time, the signals of the photoelectric sensor are obtained, the electrical signals M1 and M2 obtained at an interval of a first time threshold are obtained, and the storage thresholds S1 and S2 are obtained. M1 is the first electrical signal, M2 is the second electrical signal, Δt1 is the first time threshold, S1 is the first threshold, S2 is the second threshold, and Sk is the fourth threshold.

[0118] M1, M2, S1, S2 are compared. If S2≤M1 or M2, it is judged that there is obvious oil fume, and the range hood is in a stir-frying cooking mode. The range hood is started to run at a high gear. If S1≤M1 or M2<S2, it is judged that there is water vapor, and the range hood is in a stir-frying cooking mode. The range hood is started to run at a low gear. If M1 and M2 are both <S1, and M2-M1<Sk, it is judged that there is water vapor or oil fume gradually accumulating on the filter, which is gradually infiltrating or filling, changing the light transmission of the filter. If M2-M1 is not less than Sk, this round is ignored.

[0119] As shown in Figure 9 , when the range hood is in a start state, if no shutdown signal is received, the fan of the range hood operates according to the command gear, and the photoelectric sensor normally operates to detect more quickly. The signals of the sensor are obtained, the electrical signals M1 and M2 obtained at an interval of a first time threshold are obtained, and the storage thresholds S1, S2 and S3 are obtained. M1 is the first electrical signal, M2 is the second electrical signal, Δt1 is the first time threshold, S1 is the first threshold, S2 is the second threshold, S3 is the third threshold, and Sk is the fourth threshold.

[0120] Comparing M1, M2, S1, S2 and S3, if S2≤M1 or M2 and S3≤M1 or M2, it is judged that the filter is saturated, the rotating drum is rotated, and the filter is replaced; if S2≤M1 or M2 but S3 is not less than M1 or M2, it is judged that the oil fume is large, and the range hood is switched or kept at a high gear; if S1≤M1 or M2<S2, it is judged that there is water vapor, and the range hood is switched or kept at a low gear in a cooking mode; if M1 and M2 are both less than S1, and M2-M1<Sk, the range hood is switched or kept at a low gear. When the range hood receives a shutdown signal, the functions of the fan and the like except the photoelectric sensor are closed, the signals of the sensor are acquired, the electrical signals M1 and M2 with a first time interval threshold are acquired, the second threshold S2 is acquired, if M2 and M1 are both less than S2, the range hood is shut down, and the sensor is switched to a low-power operation, if not, the filter is contaminated with oil fume, which will affect the next start-up, and the rotating drum is rotated to replace the filter.

[0121] The addition of S3 is mainly for the running process of the fan. Once S3 is triggered during the running process of the fan, it means that the filter is saturated due to oil fume during cooking. If it is not replaced, it will affect the filtering effect of gas in the subsequent cooking process, and it is easy to pollute the rear-end parts such as the impeller.

[0122] As shown in Figure 10 and Figure 11 , the receiving end and the transmitting end of the sensor are arranged on the same side of the filter. When there is water vapor and oil, the refractive index difference decreases after the water vapor is absorbed, and the light transmission is stronger. The refractive index of oil is closer to other fillings than that of water, and the light transmission is stronger. At this time, the value received on the same side decreases. After the water vapor evaporates and the filter material dries, the refractive index difference in the filter increases, and the light transmission ability becomes weaker, and the value received on the same side increases instead.

[0123] As shown in Figure 10 , when the range hood is in a standby state, if no start-up signal is detected, the receiving and transmitting ends of the photoelectric sensor operate at a low frequency and low power consumption. At this time, the signals of the photoelectric sensor are acquired, the electrical signals M1 and M2 with a first time interval threshold are acquired, and the storage thresholds P1 and P2 are acquired, wherein M1 is a first electrical signal, M2 is a second electrical signal, Δt1 is a first time interval threshold, P1 is a first threshold, P2 is a second threshold, and Pk is a fourth threshold.

[0124] Compare M1, M2, P1, and P2. If M1 or M2 ≤ P1, the reflection is significantly reduced, indicating significant oil fumes and the cooking mode is high (stir-fry mode). The range hood should be set to high speed. If P1 ≤ M1 or M2 < P2, the presence of moisture indicates high cooking mode and the range hood should be set to low speed. If both M1 and M2 > P2, the reflection is high, and M2 - M1 > Pk, indicating that moisture or oil fumes are gradually accumulating on the filter, gradually wetting or filling it, thus changing the filter's light transmittance. If M2 - M1 is not less than Pk, this round is ignored.

[0125] like Figure 11 As shown, when the range hood is in the on state, if no shutdown signal is received, the range hood fan will run according to the command setting, the photoelectric sensor will operate normally, the detection will be faster, the sensor signal will be acquired, electrical signals M1 and M2 at intervals of the first time threshold will be acquired, and storage thresholds P1, P2 and P3 will be acquired, where M1 is the first electrical signal, M2 is the second electrical signal, Δt1 is the first time threshold, P1 is the first threshold, P2 is the second threshold, P3 is the third threshold, and Pk is the fourth threshold.

[0126] Compare M1, M2, P1, P2, and P3. If M1 or M2 ≤ P1 and M1 or M2 ≤ P3, the filter is saturated and the reflection value is very small. Rotate the drum and replace the filter. If M1 or M2 ≤ P1, but M1 or M2 is not ≤ P3, the fumes are heavy. Switch the range hood to a higher setting or keep it running at a higher speed. If P1 ≤ M1 or M2 ≤ P2, there is moisture. The range hood is in steaming / cooking mode. Switch the range hood to a lower setting or keep it running at a lower speed. If both M1 and M2 are greater than P1, the reflection value is high, and M2 - M1 > Pk. Switch the range hood to a lower setting or keep it running at a lower speed. When the range hood receives a shutdown signal, all functions except for the photoelectric sensor are turned off. The range hood acquires the sensor signals, acquires electrical signals M1 and M2 at intervals of a first time threshold, and acquires the first threshold P1. If both M2 and M1 are greater than P1, the range hood is turned off and the sensor switches to low-power operation. If not, the filter is contaminated with oil fumes, which will affect the next use. In this case, the drum is rotated and the filter is replaced.

[0127] By utilizing the changes in light information after the filter element comes into contact with or is immersed in water vapor or oil stains during the cooking process, the system can automatically determine whether to turn the machine on or off or adjust the speed. This allows the filter element to both filter oil stains and perform control and judgment functions, thus improving the intelligence of the range hood.

[0128] Corresponding to the aforementioned filter replacement method and range hood control method embodiments, the present invention also provides embodiments of a filter replacement device and a range hood control device.

[0129] Figure 12A module schematic diagram of a filter replacement device is provided for an exemplary embodiment of the present application. The filter replacement device is applied to an extractor hood. The extractor hood comprises a filter arranged at an air inlet of the extractor hood. The device comprises:

[0130] An acquisition module 121 is configured to acquire illumination information of the filter. The illumination information represents an oil fume condition.

[0131] A determination module 122 is configured to determine whether the illumination information meets a filter replacement condition.

[0132] A processing module 123 is configured to replace the filter and / or prompt filter replacement information when the determination result is yes.

[0133] Optionally, the extractor hood comprises a photoelectric sensor. The determination module 122 is specifically configured to:

[0134] Acquire at least two electrical signals output by the photoelectric sensor in sequence. The electrical signals are converted from the illumination information by the photoelectric sensor.

[0135] Determine whether the illumination information meets the filter replacement condition according to the at least two electrical signals.

[0136] Optionally, the determination module 122 is specifically configured to:

[0137] Determine an operating state of the extractor hood.

[0138] Determine a filter replacement condition matched with the operating state.

[0139] Determine whether the illumination information meets the filter replacement condition matched with the operating state.

[0140] Optionally, when the operating state is a shutdown state, the filter replacement condition comprises a first preset range. When the operating state is a running state, the filter replacement condition comprises a second preset range.

[0141] The determination module 122 is specifically configured to:

[0142] When the operating state is the shutdown state, determine whether a feature value of an illumination feature contained in the illumination information falls within the first preset range.

[0143] When the operating state is the running state, determine whether the feature value of the illumination feature contained in the illumination information falls within the second preset range.

[0144] Optionally, the filter replacement condition comprises a preset change rate. The determination module 122 is specifically configured to:

[0145] Judge whether the change rate of the illumination feature contained in the illumination information meets a preset change rate.

[0146] Optionally, the filter is a flexible filter;The range hood further comprises a first storage roller and a second storage roller arranged opposite to the first storage roller;The first storage roller is used for storing unused filters, and the second storage roller is used for storing used filters;The processing module 123 is specifically used for:

[0147] The first storage roller and the second storage roller are controlled to rotate in the same direction, and the two storage rollers rotate along the direction of the first storage roller, so as to replace the filter.

[0148] The embodiment of the application also provides a control device of the range hood, which comprises the filter replacing device provided by any of the above embodiments, and is used for controlling the replacement of the filter on the range hood.

[0149] Optionally, the control device further comprises a control module;The control module is used for matching an operation strategy according to the illumination information;And the range hood is controlled to operate based on the operation strategy.

[0150] For the device embodiment, since it basically corresponds to the method embodiment, the related parts are described in the part of the method embodiment. The device embodiment described above is only schematic, and the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, that is, they can be located in one place, or they can be distributed on multiple network units. According to actual needs, some or all of the modules can be selected to achieve the purpose of the present application scheme.

[0151] Figure 13 A structural schematic diagram of an electronic device is shown for an example embodiment of the application, which shows a block diagram of an exemplary electronic device 90 suitable for implementing the embodiments of the application. Figure 13 The electronic device 90 shown is only an example, and should not limit the function and use range of the embodiments of the application.

[0152] As Figure 13 shown, the electronic device 90 can be in the form of a general computing device, for example, it can be a server device. The components of the electronic device 90 can include but are not limited to the above-mentioned at least one processor 91, the above-mentioned at least one memory 92, the bus 93 connecting different system components including the memory 92 and the processor 91.

[0153] The bus 93 includes a data bus, an address bus and a control bus.

[0154] The memory 92 can include volatile memory, such as random access memory (RAM) 921 and / or cache memory 922, and can further include non-volatile memory, both readable and writeable ROM 923.

[0155] The memory 92 can include program tools 925 (or utilities) having a set of (at least one) program modules 924, including but not limited to: an operating system, one or more application programs, other program modules, and program data, and each of these examples, or some combination thereof, can include implementation of a network environment.

[0156] The processor 91 performs various function applications and data processing by running computer programs stored in the memory 92, such as the method provided by any of the above embodiments.

[0157] The electronic device 90 can also communicate with one or more external devices 94 (such as a keyboard or a pointing device, etc.) via an input / output (I / O) interface 95. In addition, the model generating electronic device 90 can also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 96. As shown, the network adapter 96 communicates with other modules of the model generating electronic device 90 via the bus 93. It should be understood that although not shown in the figure, other hardware and / or software modules can be used in conjunction with the model generating electronic device 90, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID (Redundant Array of Independent Disks) systems, tape drives, and data backup storage systems, etc.

[0158] It should be noted that although several units / modules or sub-units / modules of the electronic device are mentioned in the above detailed description, such division is merely exemplary and not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided into a plurality of units / modules.

[0159] Although the above describes specific embodiments of the present application, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and such changes and modifications all fall within the protection scope of the present application.

Claims

1. A filter element replacement method characterized by, The method is applied to an extractor hood, the extractor hood comprising a filter arranged at an air inlet of the extractor hood, and the method comprising: obtaining illumination information of the filter; wherein the illumination information represents an oil fume condition; determining whether the illumination information meets a filter replacement condition; when the determination result is yes, replacing the filter and / or prompting filter replacement information; the filter replacement condition comprises a preset change rate; and the determining whether the illumination information meets the filter replacement condition comprises: determining whether a change rate of an illumination feature contained in the illumination information meets the preset change rate.

2. The filter replacement method according to claim 1, characterized by, the extractor hood comprises a photoelectric sensor; and the determining whether the illumination information meets the filter replacement condition comprises: obtaining at least two electrical signals output by the photoelectric sensor in sequence; wherein the electrical signals are converted from the illumination information by the photoelectric sensor; determining whether the illumination information meets the filter replacement condition according to the at least two electrical signals.

3. The filter replacement method according to claim 1 or 2, characterized by, the determining whether the illumination information meets the filter replacement condition comprises: determining an operating state of the extractor hood; determining a filter replacement condition matched with the operating state; determining whether the illumination information meets the filter replacement condition matched with the operating state.

4. The filter replacement method according to claim 3, characterized by, when the operating state is shutdown, the filter replacement condition comprises a first preset range; and when the operating state is running, the filter replacement condition comprises a second preset range; the determining whether the illumination information meets the filter replacement condition comprises: when the operating state is shutdown, determining whether a feature value of an illumination feature contained in the illumination information falls within the first preset range; and when the operating state is running, determining whether a feature value of an illumination feature contained in the illumination information falls within the second preset range.

5. The filter replacement method according to claim 1, wherein, the filter is a flexible filter; the extractor hood further comprises a first storage roller and a second storage roller arranged opposite to the first storage roller; the first storage roller is used for storing an unused filter, and the second storage roller is used for storing a used filter; and the replacing the filter comprises: controlling the first storage roller and the second storage roller to rotate in the same direction to replace the filter.

6. A control method of an extractor hood, characterized by, the method comprises: controlling a filter on an extractor hood to be replaced according to the filter replacement method in any one of claims 1-5.

7. The control method of the range hood according to claim 6, characterized by, the method further comprises: matching an operating strategy according to the illumination information; and controlling the extractor hood to operate based on the operating strategy.

8. A filter replacement device characterized by, The device is applied to an extractor hood, the extractor hood comprising a filter arranged at an air inlet of the extractor hood, and the device comprising: an obtaining module, configured to obtain illumination information of the filter; wherein the illumination information represents an oil fume condition; a determining module, configured to determine whether the illumination information meets a filter replacement condition; a processing module, configured to, when the determination result is yes, replace the filter and / or prompt filter replacement information; the filter replacement condition comprises a preset change rate; and the determining module is configured to determine whether a change rate of an illumination feature contained in the illumination information meets the preset change rate.

9. An extractor hood comprising a memory, a processor and a computer program stored on the memory for running on the processor, characterized in that, The processor implements the filter replacement method of any one of claims 1-5 when executing the computer program.

10. An extractor hood comprising a memory, a processor and a computer program stored on the memory for running on the processor, characterized in that, The processor implements the control method of the range hood of claim 6 when executing the computer program.

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