Range hood and method for monitoring dirt condition of filter screen of range hood

Abstract

The invention discloses a method for monitoring the smudginess condition of a filter screen (1) of a range hood, and the method at least comprises the following steps: starting the range hood at a preset detection moment, especially in an unconventional cooking time period, so as to execute detection operation, in the detection operation, at least detecting working parameters of a fan (2) of the range hood, the working parameters are related to the wind resistance of the filter screen (1); and judging the smudginess condition of the filter screen (1) at least based on the working parameters. The invention further discloses a corresponding range hood. According to some exemplary embodiments of the present application, by recording the working parameters in the non-cooking time period, the interference on the working parameters caused by the simultaneous cooking of other users is eliminated. In addition, the dirt degree of the filter screen can be predicted by directly collecting working parameters by means of the characteristics of the motor, and other sensors are not needed. In addition, by introducing the total floor of the building and the floor where the range hood is located, the smudginess degree of the filter screen can be judged more reliably.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for monitoring the dirt condition of a filter screen of an extractor hood and a corresponding extractor hood. BACKGROUND

[0002] At present, almost all the extractor hoods on the market are provided with a filter screen for filtering oil and guiding the oil into an oil cup. After long-term cooking, the filter screen will be affected by the accumulated oil, which will cause problems such as affecting the appearance, emitting odor, and even affecting the smoke suction effect of the extractor hood. Therefore, the customer needs to clean it. However, due to the differences in structure of various models and filter screens, as well as the different cooking habits of customers themselves, the time period required for cleaning the filter screen to reach the dirt standard is not the same. The recommended cleaning period given by the manufacturer is a general reference value and cannot be applied to users of various models and cooking characteristics. For example, cleaning according to the recommended value may cause trouble to the customer.

[0003] Therefore, corresponding improvements are needed. SUMMARY

[0004] In order to overcome one of the above-mentioned drawbacks and / or other possible drawbacks in the prior art not mentioned herein, the object of the present application is to provide an improved method for monitoring the dirt condition of a filter screen of an extractor hood and a corresponding extractor hood.

[0005] According to a first aspect of the present application, a method for monitoring the dirt condition of a filter screen of an extractor hood is provided, the method comprising at least the following steps: S1: starting the extractor hood to perform a detection operation at a predetermined detection time, especially during an irregular cooking period, in which detection operation, at least a working parameter of a fan of the extractor hood is detected, the working parameter being related to the air resistance of the filter screen; and S2: judging the dirt condition of the filter screen based at least on the working parameter.

[0006] According to an optional embodiment of the present application, the detection operation is performed by running the extractor hood at a predetermined gear.

[0007] According to an optional embodiment of the present application, the predetermined detection time is allowed to be set by the manufacturer and / or user of the extractor hood.

[0008] According to an optional embodiment of the present application, the extractor hood is automatically started to perform the detection operation at the predetermined detection time.

[0009] According to an optional embodiment of the present application, the extractor hood is automatically turned off after the detection operation is completed.

[0010] According to an optional embodiment of the present application, a detection start prompt signal is issued before the extractor hood is started to perform the detection operation.

[0011] According to an optional embodiment of the present application, the determination of the dirtiness condition of the filter screen is based at least on a comparison of the working parameter with a comparison parameter.

[0012] According to an optional embodiment of the present application, the comparison parameter is related to at least a working characteristic of the range hood in a clean condition of the filter screen.

[0013] According to an optional embodiment of the present application, the average of the working parameter within a predetermined time length of the fan in a stable running state is compared with the comparison parameter.

[0014] According to an optional embodiment of the present application, the comparison parameter is further related to a model of the range hood and the predetermined gear.

[0015] According to an optional embodiment of the present application, the comparison parameter is determined by running the range hood in a clean condition of the filter screen in an actual installation and use condition of the range hood.

[0016] According to an optional embodiment of the present application, the comparison parameter is further related to a floor and / or a total floor of a corresponding building in the actual installation and use condition of the range hood, and the total floor and / or the floor is allowed to be set by a user.

[0017] According to an optional embodiment of the present application, the determination of the dirtiness condition of the filter screen is based at least on a variation characteristic of the working parameter during a current detection operation.

[0018] According to an optional embodiment of the present application, the determination of the dirtiness condition of the filter screen is based at least on a variation of the working parameter of the fan during a starting running to a stable state.

[0019] According to an optional embodiment of the present application, the determination of the dirtiness condition of the filter screen is based at least on a variation rate and / or a time length of the working parameter of the fan during a starting running to a stable state.

[0020] According to an optional embodiment of the present application, the determination of the dirtiness condition of the filter screen is based at least on a variation characteristic of the working parameter between multiple detection operations, preferably successive detection operations.

[0021] According to an optional embodiment of the present application, the working parameter is a rotation speed and / or an electrical input characteristic of the fan.

[0022] According to an optional embodiment of the present application, a cleaning reminding signal for reminding cleaning the filter screen is sent if a determination result of a current detection operation indicates that the filter screen reaches a dirtiness standard requiring cleaning.

[0023] According to an optional embodiment of the present application, if the judgment result of the current detection operation indicates that the filter screen has not reached the dirt level requiring cleaning, the next detection operation is performed at an interval period, wherein the interval period is a predetermined period, for example, a predetermined number of days, or is adjustable.

[0024] According to an optional embodiment of the present application, the interval period is adjusted based on at least one of the number of detection operations performed since the last cleaning state of the filter screen, the time length elapsed, and the actual usage of the range hood.

[0025] According to an optional embodiment of the present application, the actual usage includes at least one of the cumulative working time length of the range hood since the last cleaning state of the filter screen, the working gear, and the service life of the range hood.

[0026] According to an optional embodiment of the present application, the interval period to the next detection operation is adjusted based on the current dirt condition of the filter screen.

[0027] According to an optional embodiment of the present application, the timing of issuing the cleaning reminder signal is adjusted based on at least learning of historical data of the user cleaning the filter screen.

[0028] According to an optional embodiment of the present application, the presentation form and / or presentation time of the cleaning reminder signal are determined based on a predetermined detection time.

[0029] According to a second aspect of the present application, a range hood is provided, comprising: a filter screen; a fan; and a controller configured to at least assist in performing the method according to any of the above embodiments.

[0030] According to an optional embodiment of the present application, the range hood has an input module allowing input of information related to the monitoring of the dirt condition of the filter screen.

[0031] According to certain exemplary embodiments of the present application, by recording the working parameters during a non-cooking period, the interference of other users cooking at the same time on the working parameters is excluded, the purpose of accurately judging the dirt level of the filter screen is achieved, and the user experience of cleaning the filter screen is improved. Moreover, the working parameters can be directly collected by means of the motor's own characteristics to predict the dirt level of the filter screen, without the need for other sensors, thereby reducing the cost of function implementation. In addition, by introducing the total number of floors of the building and the floor on which the range hood is located, the dirt level of the filter screen can be more reliably judged. BRIEF DESCRIPTION OF DRAWINGS

[0032] The principles, features and advantages of the present application can be better understood by referring to the following detailed description of the application, taken in conjunction with the accompanying drawings in which:

[0033] Figure 1A schematic diagram showing a usage scenario of a range hood is shown in accordance with one example embodiment of the present application.

[0034] Figure 2 A flowchart showing a method for monitoring a dirty condition of a filter screen of a range hood is shown in accordance with one example embodiment of the present application.

[0035] Figure 3 A flowchart showing a method for monitoring a dirty condition of a filter screen of a range hood is shown in accordance with one more specific example embodiment of the present application. DETAILED DESCRIPTION

[0036] In order to make the technical problems to be solved by the present application, technical solutions and beneficial technical effects more clearly understood, the present application will be further described in detail below in conjunction with the accompanying drawings and multiple example embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the protection scope of the present application, and each embodiment can share the same view or multiple views described, but it cannot be interpreted that all features appearing in the same view as a feature that an embodiment must have. On the contrary, as long as they are not technically mutually exclusive, they can be combined in any suitable manner. Moreover, for the sake of brevity, different aspects of different embodiments can be presented in the same specific design, however, such presentation does not mean that the embodiments of these aspects should appear together. All possible disassembling and / or combinations of embodiments and / or technical features should also consider the description of the specification and what can be directly and unambiguously determined by the person skilled in the art based on the description of the specification.

[0037] Figure 1 A schematic diagram showing a usage scenario of a range hood is shown in accordance with one example embodiment of the present application.

[0038] As Figure 1 shown, in a building, range hoods at different floors are usually connected to the same chimney of the building so as to suck cooking fumes in the kitchen into the chimney and then discharge out of the building (see arrows in Figure 1 ). Figure 1 Only two adjacent floors are shown schematically in

[0039] As Figure 1As shown by the arrows in the figure, a filter 1 for filtering the oil smoke and a fan 2 for generating suction are located along the oil smoke flow path. Fan 2 is located downstream of filter 1. As the suction process progresses, grease gradually accumulates on filter 1, reducing its flow characteristics. This not only affects the operation of fan 2 but also reduces the filtering capacity of filter 1 itself, and can even cause grease to flow from filter 1 to undesirable locations. Therefore, filter 1 needs to be cleaned regularly depending on its contamination level.

[0040] To this end, according to an exemplary embodiment of the present application, a flow chart of a method for monitoring the dirtiness of the filter 1 of a range hood is provided. Figure 2 As shown, the method includes at least the following steps: S1) starting the range hood at a predetermined detection time to perform a detection operation, in which at least the working parameters of the fan 2 of the range hood are detected, and the working parameters are related to the wind resistance of the filter 1; and S2) judging the dirtiness of the filter 1 based on at least the working parameters.

[0041] In a range hood, in order to achieve a set suction force, when the filter 1 is dirty and the wind resistance increases, the fan 2 must be matched with corresponding operating parameters, that is, the output power must be increased.

[0042] However, if Figure 1 As shown, when fan 2 is actually used, it will be in a specific fluid path scenario. Its operating characteristics are also affected by other factors, especially the airflow conditions in the flue downstream of fan 2. The same flue may be connected to multiple range hoods, which may operate at different times, models, specifications, and gears. The operating effects of range hoods on different floors on the airflow in the flue will also vary. Therefore, in order to improve the accuracy and reliability of detection, it is necessary to avoid or reduce this influence as much as possible.

[0043] To this end, according to an exemplary embodiment of the present application, the detection operation is performed during an irregular cooking period. In other words, the scheduled detection time falls within the irregular cooking period. During irregular cooking periods, the probability of a range hood being used is low, and there may be no range hoods in use in the same flue. Therefore, during the detection operation, only one range hood to be tested is likely to be operating, creating a relatively reliable premise for the detection operation.

[0044] It is appreciated by those skilled in the art that the irregular cooking period is relative to the regular cooking period and is a relative concept. For example, the regular cooking period (local time) can be approximately as follows: breakfast 6-9 o'clock, lunch 11-14 o'clock, and dinner 16-19 o'clock. The other time of the day can be referred to as the irregular cooking period. The probability of a user cooking at home for lunch is low on weekdays, and the probability of a user cooking at home for three meals increases on weekends and holidays. The use of the range hood can also be different in restaurants or other places. Even in a villa or other use, the range hood can be started at any time for detection operation. Regardless of how, it is shown that the irregular cooking period changes with the use of the range hood, and therefore, according to an example embodiment of the present application, the predetermined detection time can be set by the user. Alternatively, the irregular cooking period can be set, and therefore, any subsequent detection operation must be performed within the set non-cooking period.

[0045] In this way, the predetermined detection time can be flexibly set at a time that does not affect the user's life according to the actual situation. For example, the user can set the predetermined detection time in the irregular cooking period when no one is at home according to his own life and work rhythm. In this case, the range hood can be automatically started to perform the detection operation at the predetermined detection time. Of course, the range hood is preferably automatically turned off after the detection operation. In this case, the entire detection operation is automatically completed by the range hood without human intervention.

[0046] According to an example embodiment of the present application, the range hood is caused to operate at a predetermined gear to perform the detection operation. It is appreciated by those skilled in the art that the working parameters of the range hood change with the working gear of the range hood, and therefore, it is very advantageous to cause the range hood to operate at a predetermined gear during detection. The "predetermined gear" can correspond to those actual working gears of the range hood that can be selected by the user, or can be a certain working state of the built-in fan 2. The predetermined gear can be selected to cause the fan 2 to work at the lowest noise, which can reduce the impact on the user.

[0047] However, as described above, the range of the irregular cooking period is large, and it is likely to overlap with the user's living habits and affect the user's life. For example, the noise generated by starting the range hood in the early morning to the morning can affect the user or the neighbor's rest, and even cause unnecessary fright. Therefore, according to an example embodiment of the present application, a detection start prompt signal is issued before the range hood is started to perform the detection operation. The user decides whether to start the range hood to perform the detection operation according to the detection start prompt signal.

[0048] In addition, according to an example embodiment of the present application, the predetermined detection time can also be set by the manufacturer of the range hood.

[0049] According to an exemplary embodiment of the present application, the dirty condition of the filter screen 1 is determined based on at least a comparison between the operating parameter of the fan 2 and a comparison parameter. As mentioned above, the operating parameter of the fan 2 is related to the dirty condition of the filter screen 1. Therefore, by detecting whether and / or how much the actual operating parameter of the fan 2 deviates from the comparison parameter, the dirty condition of the filter screen 1 can be determined. The comparison parameter can be a preset threshold value or a set of preset parameters (e.g. a characteristic curve). As a possible embodiment, the filter screen 1 is considered to be in a state requiring cleaning when the operating parameter deviates from the comparison parameter by more than 10%.

[0050] The operating parameter of the fan 2 (of its motor) is not stable when the fan 2 is started, and therefore, it is relatively reliable to compare the average value of the operating parameter of the fan 2 within a predetermined time period of stable operation with the comparison parameter. Herein, the "average value" should be understood as any suitable mathematical expression representing the overall level of the operating parameter, such as "median".

[0051] Preferably, the comparison parameter is related to at least the operating characteristics of the extractor hood when the filter screen 1 is clean. In practice, the comparison parameter can be determined during the manufacturing process and / or during the operation of the extractor hood or by other means. Of course, the comparison parameter is also related to the model of the extractor hood and the predetermined gear. Different models can have different specifications of the fan 2 and different flow paths of the extractor hood, which can affect the comparison parameter. An advantageous embodiment is to determine the comparison parameter when the extractor hood is started with a clean filter screen 1, for example, immediately after cleaning or immediately after installation of a brand new extractor hood, so as to eliminate as many influencing factors as possible. This can be achieved by providing a corresponding setting button or function menu on the operation interface of the extractor hood.

[0052] It can be understood that for a building with a total number of floors, the installation of the extractor hood at different floors means that the fan 1 is in different environments of gas flow, which will inevitably affect the determination of the comparison parameter. For example, the fan is at the first floor and the tenth floor, and the wind resistance downstream of the fan 2 is different.

[0053] Therefore, according to an exemplary embodiment of the present application, the comparison parameter is also related to the floor at which the extractor hood is installed and / or the total number of floors of the corresponding building in the actual installation and use state of the extractor hood, and the total number of floors and / or the floor can be set by the user. In particular, the total number of floors and / or the floor can be set when the extractor hood is initially installed. In particular, taking into account the total number of floors of the building and the specific floor at which the extractor hood is installed can reliably correct the preset comparison parameter of the extractor hood.

[0054] In this case, the comparison parameter can be a function of the floor and the total number of floors, and when the user inputs the floor and the total number of floors, the controller (not shown) of the extractor hood can automatically calculate (update) the corrected comparison parameter corresponding to the extractor hood.

[0055] The accumulation of oil directly affects the wind resistance of the filter screen 1, which also directly affects the working characteristics of the fan 2 during the current detection operation. In some cases, the working characteristics can also be represented by the change of working parameters. For example, as the oil accumulates more or less, the fan 2 either starts with a heavy load or starts more lightly, so the change of working parameters, such as the initial start-up current for driving the fan 2, will also be different. Therefore, according to an exemplary embodiment of the present application, the dirty condition of the filter screen 1 is determined based at least on the change characteristics of the working parameters during the current detection operation. At this time, there can also be a comparison parameter as a comparison reference.

[0056] As described above, preferably, according to an exemplary embodiment of the present application, the dirty condition of the filter screen 1 is determined at least by the change of working parameters, such as the working current, of the fan 2 from the start-up operation to the steady state.

[0057] Further, the dirty condition of the filter screen 1 is determined at least by the change rate and / or the time length of the working parameters of the fan 2 from the start-up operation to the steady state.

[0058] The oil is usually accumulated gradually, that is, the dirty degree of the filter screen 1 is also gradually changed, which means that the working parameters during multiple detection operations, preferably successive detection operations, will also be changed. This change indicates the development trend of the dirty degree of the filter screen 1. Therefore, according to an exemplary embodiment of the present application, the dirty condition of the filter screen 1 is determined based at least on the change characteristics of the working parameters between multiple detection operations, preferably successive detection operations. For example, if the working parameters before and after the operation of the range hood for a period of time do not change much, one of the most possible cases is that the filter screen 1 is dirty to the extent that it cannot be dirtier, therefore, in principle, the dirty condition of the filter screen 1 can also be determined by the change trend of the working parameters between multiple detection operations. Of course, if combined with other parameters, such as how long the range hood has been away from the last cleaning operation of the filter screen 1, the accuracy of the determination can be further improved.

[0059] This determination method can be realized by learning the historical data of the range hood or the historical data of other corresponding range hoods.

[0060] According to an exemplary embodiment of the present application, if the determination result of the current detection operation indicates that the filter screen 1 has not reached the dirty standard requiring cleaning, the next detection operation can be performed at an interval period.

[0061] The interval period can be a predetermined period, for example, a predetermined number of days. Alternatively, the interval period is adjustable, in particular, in dependence of the current detection result, for example, the degree of deviation of the operating parameter from the comparison parameter. For example, in case the filter 1 has just been cleaned, the next detection operation can be performed after a relatively long interval, and as the grease accumulates, the detection operations can be performed with increasing frequency.

[0062] The determination of the interval period can also take into account at least one of the length of time since the last cleaning, the number of detection operations performed cumulatively, and the actual usage of the extractor hood.

[0063] According to an exemplary embodiment of the present application, the actual usage comprises at least one of the cumulative operating time of the extractor hood since the last cleaning of the filter 1, the operating mode, and the age of the extractor hood.

[0064] As mentioned above, the operating parameter can reflect the dirtiness of the filter 1, and thus, the interval period until the next detection operation can be dynamically adjusted based on the current dirtiness of the filter 1, which can be characterized by the current operating parameter. In this way, the number of detection operations, and thus, the impact on the user can be minimized.

[0065] As mentioned above, the operating parameter can be the operating current of the fan 2, and of course, also other electrical input characteristics, as long as they reflect the corresponding reaction of the fan 2 in response to the dirtiness of the filter 1, for example, also the rotational speed can be used.

[0066] According to an exemplary embodiment of the present application, a cleaning reminder signal can be issued if the result of the current detection operation indicates that the filter 1 has reached the dirtiness criterion requiring cleaning. In this way, the user can clean the filter 1 in time. As mentioned above, the detection operation is performed during an irregular cooking period, for example, between 9 and 10 o'clock in the morning on weekdays, when the house can be unoccupied and the cleaning reminder signal cannot be noticed. In this case, the cleaning reminder signal can be presented at another predetermined time, for example, during a subsequent regular cooking period or between 8 and 9 o'clock in the evening. It can be presented in the form of a lighted indicator. This can minimize the impact on the user. Of course, the form of the cleaning reminder signal can also be determined, for example, in dependence of a user setting, for example, if the detection operation occurs at night, the cleaning reminder signal can be presented in the form of a lighted indicator or delayed, and if it occurs during a user set period, it can be presented in the form of an acoustic signal.

[0067] One scenario is that even if the controller of the range hood judges that the filter 1 needs cleaning, the user can think that it can still hold on for a while before cleaning by naked eyes or experience. For this reason, according to one exemplary embodiment of the present application, the timing of sending the cleaning reminder signal is adjusted based on at least learning of historical data of the user cleaning the filter 1.

[0068] Preferably, after the user cleans the filter 1, the user can input a signal to the range hood through the user interface of the range hood that the user has finished cleaning, which can serve as the starting point for the next judgment or form useful historical data.

[0069] Various possible embodiments of the present application have been described above, but for better understanding, Figure 3 A flow chart according to one specific embodiment of the present application is shown.

[0070] In Figure 3 Steps S1 and S2 can be the same as the above-mentioned steps S1 and S2, and will not be described again here. If the judgment result in step S2 indicates that the dirt condition of the filter 1 has not yet reached the dirt standard requiring cleaning, i.e. the judgment result is N, the range hood can wait for a predetermined period of time (which can be determined by the controller) in step S3, and then return to step S1. If the judgment result in step S2 is Y, it can proceed to step S4 to send a cleaning reminder signal. After the user completes the cleaning operation in step S5 under the instruction of the cleaning reminder signal, the user performs cleaning completion confirmation, for example through the user interface, and then returns to step S1 to perform the next round of detection.

[0071] According to another aspect of the present application, a range hood is provided, comprising a filter 1, a fan 2, and a controller configured to at least assist in performing the method according to any of the above embodiments.

[0072] As mentioned above, in order to achieve more efficient dirt condition monitoring, it is advantageous to allow the user to interact with the range hood, for which, according to one exemplary embodiment of the present application, the range hood has an input module allowing input of information related to the monitoring of the dirt condition of the filter 1. The input module can be part of the existing user interface.

[0073] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present application disclosure, even if a single embodiment is described only with respect to a particular feature. The feature examples provided in the present application disclosure are intended to be illustrative rather than limiting, unless explicitly stated otherwise. In actual implementation, a plurality of features can be combined with each other as technically feasible according to actual needs. Various substitutions, changes and modifications can also be conceived without departing from the spirit and scope of the present application.

Claims

1. A method for monitoring a dirty condition of a filter screen (1) of an extractor hood, the method comprising at least the following steps: S1 : initiating the extractor hood to perform a detection operation at a predetermined detection time, in particular during an irregular cooking period, in which detection operation at least a working parameter of a fan (2) of the extractor hood is detected, which working parameter is related to an air resistance of the filter screen (1); and S2: determining the dirty condition of the filter screen (1) based at least on the working parameter.

2. The method according to claim 1, wherein the detection operation is performed with the extractor hood running at a predetermined operating level; and / or the predetermined detection time is allowed to be set by a manufacturer and / or a user of the extractor hood; and / or the extractor hood is automatically initiated to perform the detection operation at the predetermined detection time; and / or the extractor hood is automatically switched off after the detection operation is finished; and / or a detection start prompt signal is issued before the extractor hood is initiated to perform the detection operation.

3. The method according to claim 1 or 2, wherein the dirty condition of the filter screen (1) is determined based at least on a comparison of the working parameter with a comparison parameter.

4. The method according to claim 3, wherein the comparison parameter is related at least to a working characteristic of the extractor hood in a state in which the filter screen (1) is clean; and / or an average value of the working parameter over a predetermined time duration of a stable running state of the fan (2) is compared with the comparison parameter.

5. The method according to any one of claims 1 to 4, wherein the comparison parameter is further related to a model of the extractor hood and the predetermined operating level; and / or the comparison parameter is determined by running the extractor hood in a state in which the filter screen (1) is clean in an actual installation and use state of the extractor hood; and / or the comparison parameter is further related to a floor level and / or a total floor level of a corresponding building in which the extractor hood is installed and used, the total floor level and / or the floor level being allowed to be set by a user.

6. The method according to any one of claims 1 to 5, wherein the dirty condition of the filter screen (1) is determined based at least on a variation characteristic of the working parameter during a current detection operation.

7. The method according to claim 6, wherein the dirty condition of the filter screen (1) is determined at least by a variation of the working parameter during a start-up running to a stable state of the fan (2).

8. The method according to claim 7, wherein the dirty condition of the filter screen (1) is determined at least by a variation rate and / or a time duration of the working parameter during a start-up running to a stable state of the fan (2).

9. The method according to any one of claims 1 to 8, wherein the dirty condition of the filter screen (1) is determined based at least on a variation characteristic of the working parameter between a plurality of detection operations, preferably successive detection operations; and / or the working parameter is a rotational speed and / or an electrical input characteristic of the fan (2); and / or a cleaning reminder signal is issued if a result of a determination of a current detection operation indicates that the filter screen (1) reaches a dirty standard requiring cleaning.

10. An extractor hood comprising a filter screen (1) and a fan (2) for monitoring a dirty condition of the filter screen (1), the extractor hood comprising a control unit (3) configured to perform a method according to any one of claims 1 to 9. ​ ​ 10. The method according to any one of claims 1-9, wherein, if the result of the current detection operation indicates that the filter screen (1) has not yet reached a dirtiness level requiring cleaning, a next detection operation is performed at an interval period, wherein the interval period is a predetermined period, e.g. a predetermined number of days, or is adjustable.

11. The method according to claim 10, wherein, the interval period is adjusted based on at least one of the number of detection operations performed since the last cleaning state of the filter screen (1), the elapsed time, and the actual usage of the extractor hood.

12. The method according to claim 11, wherein, the actual usage comprises at least one of the accumulated working time of the extractor hood since the last cleaning state of the filter screen (1), the working gear, and the age of the extractor hood; and / or the interval period until the next detection operation is adjusted based on the current dirtiness condition of the filter screen (1).

13. The method according to claim 16, wherein, the timing of the cleaning reminder signal is adjusted based on at least a learning of historical data of user cleaning of the filter screen (1); and / or the presentation form and / or the presentation time of the cleaning reminder signal is determined based on a predetermined detection time.

14. An extractor hood, comprising: a filter screen (1); a fan (2); and a controller configured to at least assist in performing the method according to any one of claims 1-13.

15. The extractor hood according to claim 14, wherein, the extractor hood has an input module allowing input of information related to the monitoring of the dirtiness condition of the filter screen (1). ​

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