Variable-frequency extractor hood, control method and device thereof and storage medium

Abstract

The invention discloses a variable-frequency extractor hood control method and device, an extractor hood and a storage medium. The variable-frequency extractor hood control method comprises the steps that first back pressure borne by the extractor hood during operation is obtained, and the air volume of a variable-frequency draught fan of the extractor hood under the first back pressure is obtained; whether the first back pressure is in a middle back pressure interval or not is determined, and a plurality of back pressure intervals are preset based on the back pressure range possibly borne by the range hood during operation and comprise the high back pressure interval, the middle back pressure interval and the low back pressure interval; if yes, target operation parameters of the frequency conversion fan are determined according to the first back pressure and the air volume; and the frequency conversion fan is controlled to operate according to the target operation parameters. According to the embodiment of the invention, the variable-frequency fan of the range hood is more accurately controlled, so that the oil smoke suction effect of the range hood is improved.

Description

Technical Field

[0001] The present application relates to the technical field of range hood control, and in particular to a variable frequency range hood and a control method, device, and storage medium thereof. Background Art

[0002] With the rapid development of intelligent devices, range hoods have also evolved from fixed-frequency control to variable-frequency control. Variable-frequency control of range hoods involves installing a variable-frequency fan within the range hood and intelligently controlling it to achieve variable-frequency operation. In related technologies, variable-frequency range hoods typically control the fan's operating frequency based on indoor oil fume concentration, for example, by adjusting the fan's frequency as oil fume concentration changes. However, this adjustment method has been ineffective. Summary of the Invention

[0003] The main purpose of this application is to provide a variable frequency range hood and its control method, device and storage medium, aiming to make the frequency conversion control process of the range hood more accurate and improve the oil fume extraction effect of the range hood.

[0004] To achieve the above objectives, in a first aspect, the present application provides a method for controlling a variable frequency range hood, the method comprising:

[0005] obtaining a first back pressure to which the range hood is subjected during operation, and obtaining an air volume of a variable frequency fan of the range hood when subjected to the first back pressure;

[0006] determining whether the first back pressure is in a medium back pressure interval, wherein a plurality of back pressure intervals are preset based on a back pressure range that the range hood may be subjected to during operation, including a high back pressure interval, the medium back pressure interval, and a low back pressure interval;

[0007] If yes, determining target operating parameters of the variable frequency fan according to the first back pressure and the air volume;

[0008] The variable frequency fan is controlled to operate according to the target operating parameters.

[0009] In a possible implementation, determining the target operating parameters of the variable frequency fan according to the first back pressure and the air volume includes:

[0010] determining a backpressure change trend based on the first backpressure and a second backpressure obtained in a previous period;

[0011] Target operating parameters of the variable frequency fan are determined according to the first back pressure, the air volume, and the back pressure change trend.

[0012] In a possible implementation, determining the target operating parameters of the variable frequency fan according to the first back pressure, the air volume, and the back pressure change trend includes:

[0013] When the back pressure change trend reflects that the back pressure to which the range hood is subjected is gradually increasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is less than or equal to the first preset air volume threshold, the target operating parameters are determined based on the first operating parameters required by the variable frequency fan when the back pressure to which the range hood is subjected is in the high back pressure range.

[0014] In a possible implementation, determining the target operating parameters of the variable frequency fan according to the first back pressure, the air volume, and the back pressure change trend includes:

[0015] When the back pressure change trend reflects that the back pressure to which the range hood is subjected is gradually increasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is greater than or equal to the second preset air volume threshold, the target operating parameters are determined based on the second operating parameters required by the variable frequency fan when the back pressure to which the range hood is subjected is in the medium back pressure range, wherein the first preset air volume threshold is less than or equal to the second preset air volume threshold.

[0016] In a possible implementation, determining the target operating parameters of the variable frequency fan according to the first back pressure, the air volume, and the back pressure change trend includes:

[0017] When the back pressure change trend reflects that the back pressure to which the range hood is subjected is gradually decreasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is greater than or equal to the second preset air volume threshold, the target operating parameter is determined based on the third operating parameter required by the variable frequency fan when the back pressure to which the range hood is subjected is in the low back pressure range.

[0018] In a possible implementation, determining the target operating parameters of the variable frequency fan according to the first back pressure, the air volume, and the back pressure change trend includes:

[0019] When the back pressure change trend reflects that the back pressure to which the range hood is subjected is gradually decreasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is less than or equal to the first preset air volume threshold, the target operating parameters are determined based on the second operating parameters required for the variable frequency fan when the back pressure to which the range hood is subjected is in the medium back pressure range.

[0020] In a possible implementation, after obtaining the first back pressure to which the range hood is subjected during operation and obtaining the air volume of the variable frequency fan of the range hood when subjected to the first back pressure, the method further includes:

[0021] The first preset air volume threshold and the second preset air volume threshold are determined according to the first back pressure.

[0022] A second aspect based on the first aspect above further provides a variable frequency range hood control device, the control device comprising:

[0023] an acquiring unit, configured to acquire a first back pressure to which the range hood is subjected during operation, and to acquire an air volume of a variable frequency fan of the range hood when subjected to the first back pressure;

[0024] a judgment unit, configured to determine whether the first back pressure is in a medium back pressure interval, wherein a plurality of back pressure intervals are preset based on a back pressure range that the range hood may be subjected to during operation, including a high back pressure interval, a medium back pressure interval, and a low back pressure interval;

[0025] a processing unit, configured to determine target operating parameters of the variable frequency fan according to the first back pressure and the air volume when the judgment unit determines that the first back pressure is in the medium back pressure range;

[0026] A control unit is used to control the variable frequency fan to operate according to the target operating parameters.

[0027] A third aspect based on the first or second aspect is also provided, wherein a variable frequency range hood comprises: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other via the communication bus;

[0028] The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute the method described in the first aspect above.

[0029] A fourth aspect based on the first aspect is further proposed, wherein a computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it is used to implement the method described in the first aspect.

[0030] In a fifth aspect, the present application further provides a computer program product, wherein the computer program product comprises at least one executable instruction, and the executable instruction is configured to execute the method described in the first aspect above.

[0031] The embodiments of the present application propose a variable-frequency range hood and its control method, device and storage medium. During the operation of the range hood, the target operating parameters of the variable-frequency fan are determined based on the first back pressure applied to the range hood and the air volume of the variable-frequency fan of the range hood when it is subjected to the first back pressure. Then, the variable-frequency fan is controlled based on the target operating parameters. In particular, when the first back pressure is in the medium back pressure range, the target operating parameters are determined by the first back pressure and the air volume, so that the range hood always maintains an optimal oil fume extraction state. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A flow chart of a method for controlling a variable frequency range hood is provided for one embodiment of the present application;

[0033] Figure 2 A schematic diagram showing the relationship between standard static pressure and air volume of a variable frequency fan for a range hood provided in one embodiment of the present application;

[0034] Figure 3 A flow chart of a method for controlling a variable frequency range hood provided in another embodiment of the present application;

[0035] Figure 4 for Figure 2 Enlarged schematic diagram of the middle M part;

[0036] Figure 5 A flowchart of a method for controlling a variable frequency range hood is provided for another embodiment of the present application;

[0037] Figure 6 This is a structural schematic diagram of a variable frequency range hood control device provided in one embodiment of the present application.

[0038] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] In the specification and claims of this application, as well as in the accompanying drawings, the terms "first," "second," "third," "fourth," and so on are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate. For example, first information could be referred to as second information, and similarly, second information could be referred to as first information without departing from the scope of this disclosure.

[0041] The word "if" as used herein may be interpreted as "when" or "when" or "in response to determining," depending on the context.

[0042] Furthermore, as used herein, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise.

[0043] It should be further understood that the terms “comprises” and “includes” indicate the existence of features, steps, operations, elements, components, items, types, and / or groups, but do not preclude the existence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, types, and / or groups.

[0044] The terms "or" and "and / or" as used herein are to be interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C." An exception to this definition occurs only when a combination of elements, functions, steps, or operations are inherently mutually exclusive in some manner.

[0045] Variable-frequency range hoods intelligently adjust the frequency of their fans based on indoor fume concentration. Compared to fixed-frequency range hoods, they offer better fume extraction and are energy-efficient, making them increasingly popular. However, the intelligent control of these range hoods still has limitations. For example, while they control the fan's frequency based on fume concentration, they are also affected by duct back pressure (exhaust resistance) during actual operation. Even if the fan's frequency is adjusted to a higher value, the back pressure will still limit the fan's air volume, impacting the fume extraction effect. This is especially true when the back pressure is above a certain value and is gradually increasing. If the fan cannot be quickly adjusted to maintain or increase its air volume, the fume extraction effect will be poor.

[0046] Based on this, an embodiment of the present application provides a variable frequency range hood control method. When the range hood is subjected to a large back pressure, a better target operating frequency of the variable frequency fan is determined based on the back pressure and air volume, and the variable frequency fan is controlled according to the target operating frequency to improve the oil fume extraction effect of the variable frequency range hood.

[0047] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0048] Reference Figure 1 An embodiment of the present application provides a flow chart of a method for controlling a variable frequency range hood, the method comprising:

[0049] S101, obtaining a first back pressure to which the range hood is subjected during operation, and obtaining an air volume of a variable frequency fan of the range hood when subjected to the first back pressure;

[0050] In the embodiment of the present application, the range hood includes a variable frequency fan and a processor, with the variable frequency fan being controlled by the processor. During operation of the range hood, the back pressure within the duct may continuously change, so the first back pressure obtained at different times may vary. Accordingly, under the influence of the first back pressure, the air volume of the variable frequency fan may also vary when subjected to the first back pressure.

[0051] While obtaining the first back pressure on the range hood, the corresponding air volume of the variable frequency fan is obtained, and then the operating frequency of the variable frequency fan is adjusted in combination with the first back pressure and the air volume to ensure that the air volume of the variable frequency fan is sufficient to achieve an effective exhaust effect.

[0052] As an embodiment, a back pressure detection device can be installed in the range hood to detect the first back pressure during range hood operation. Correspondingly, an air volume detection device can be installed in the range hood to detect the air volume of the variable frequency fan.

[0053] As another implementation method, in order to reduce the cost of the range hood, the back pressure detection device and the air volume detection device may not be provided. By obtaining the power, current, torque, current and other operating parameters of the variable frequency fan, the first back pressure applied to the range hood and the air volume of the variable frequency fan when it is subjected to the first back pressure are calculated based on these operating parameters.

[0054] S102, determining that the first back pressure is in a medium back pressure range, and determining target operating parameters of the variable frequency fan based on the first back pressure and the air volume;

[0055] S103, controlling the variable frequency fan to operate according to target operating parameters.

[0056] During operation, a range hood experiences minimal resistance when the back pressure is below 400 Pa, and a variable-frequency fan achieves the highest air volume at the same power level. Therefore, a range hood's extraction efficiency is best achieved in the low-back-pressure range. However, due to factors such as the range hood's operating hours and peak cooking times, back pressure gradually increases, and correspondingly, air volume decreases. In other words, the range hood's exhaust difficulty increases as the back pressure reaches the medium and high back-pressure ranges.

[0057] In each embodiment of the present application, multiple back pressure intervals are preset based on the back pressure range that the range hood may be subjected to during operation, including a high back pressure interval, a medium back pressure interval, and a low back pressure interval. Figure 3 As shown in the figure, the range with standard static pressure above 800Pa is configured as high back pressure range, the range with standard static pressure between 400Pa and 800Pa is configured as medium back pressure range, and the range with standard static pressure below 400Pa is configured as low back pressure range. It should be noted that the range hood can successfully remove oil smoke only when the standard static pressure of the variable frequency fan is greater than the back pressure, and the standard static pressure changes with the back pressure, so the standard static pressure of the variable frequency fan reflects the changing trend and size of the back pressure. Figure 3 As shown in the figure, when the variable frequency fan operates in the low pressure range, the resistance encountered by the variable frequency fan is minimal and a large air volume can be achieved, so the low back pressure range is also a large flow range.

[0058] In different back pressure ranges, different frequency conversion control methods are adopted for the variable frequency fan according to the influence of back pressure on the oil fume extraction effect. For example, in the low back pressure range, the back pressure is small, and the static pressure of the variable frequency fan is small. The basic operating parameters, that is, the operating parameters associated with the low back pressure range, are set, and the variable frequency fan is controlled to operate according to the basic operating parameters, or the variable frequency fan is adjusted within the set basic operating parameter range according to the oil fume concentration. In the medium back pressure range, the range hood is subjected to a large back pressure, and the corresponding static pressure demand of the variable frequency fan increases. The static pressure demand is determined according to the back pressure, and then the upper limit operating parameters and lower limit operating parameters corresponding to the medium back pressure range are set according to the static pressure demand, that is, the operating parameters associated with the medium back pressure range, and the variable frequency fan is controlled to gradually adjust to the upper limit operating parameters based on the lower limit operating parameters corresponding to the medium back pressure range; wherein, in the medium back pressure range, the adjustment speed of the operating parameters of the variable frequency fan is faster than the adjustment speed of the low back pressure range. In the high back pressure range, the back pressure is the largest, and the back pressure may approach or exceed the maximum static pressure of the variable frequency fan, making smoke exhaust extremely difficult. Therefore, the maximum operating parameters corresponding to the high back pressure range are set, that is, the operating parameters associated with the high back pressure range. After the variable frequency fan is adjusted to the maximum operating parameters of the high back pressure range, if the back pressure continues to rise, the flue cleaning alarm is triggered.

[0059] Based on the above-mentioned control method of the variable frequency fan in different back pressure ranges, when the first back pressure experienced by the range hood is in the medium back pressure range, the variable frequency fan is controlled to gradually adjust from the lower limit operating parameter corresponding to the medium back pressure range to the upper limit operating parameter, or to perform variable frequency control between the upper and lower limit operating parameters based on the back pressure or air volume, thereby adjusting the oil fume extraction effect of the range hood. Although this adjustment method can meet the oil fume extraction effect of the range hood, when the first back pressure is in the medium back pressure range and the trend of the back pressure experienced by the range hood reflects a gradual increase in back pressure (i.e., when the back pressure rises rapidly), this control method of the variable frequency fan may experience adjustment lag. For example, when the back pressure rises to the upper limit back pressure of the medium back pressure range, the variable frequency fan needs to suddenly increase in speed to the operating parameter corresponding to the high back pressure range (maximum operating parameter). At this time, the static pressure of the variable frequency fan may still be lower than the back pressure (static pressure adjustment lag), which may cause oil fume backflow. That is, when the back pressure rises sharply from the medium back pressure range to the high back pressure range, the adjustment method of the variable frequency fan in the relevant technology may cause the problem of oil smoke backflow, thereby affecting the oil smoke extraction effect of the range hood.

[0060] Based on this, in an embodiment of the present application, when the first back pressure is in the medium back pressure range, the possibility of the back pressure of the range hood rising to the high back pressure range is analyzed based on the first back pressure and the air volume, and then the target operating parameters of the variable frequency fan are determined based on the possibility of the back pressure rising to the high back pressure range. Different target operating parameters are used to control the variable frequency fan in different situations, so that the range hood has a better oil fume extraction effect in different scenarios and operating environments. For example, if the first back pressure of the range hood is in the medium back pressure range, and the back pressure has the possibility of rising to the high back pressure range, the operating parameters of the variable frequency fan are increased in advance, and the back pressure of the fan is adjusted in advance so that the static pressure is always greater than the back pressure, which can avoid the occurrence of oil fume backflow when the back pressure rises to the high back pressure range. Among them, there are many specific ways to implement the early increase of the operating parameters of the variable frequency fan, such as using the operating parameters of the high back pressure range for control (for details, please refer to the description of the following embodiment), or using operating parameters that are greater than the operating parameters of the medium back pressure range for control, etc., which are not listed in detail here.

[0061] It is understandable that the operating parameters of the variable frequency fan include but are not limited to the operating frequency of the variable frequency fan.

[0062] In an embodiment of the present application, during the operation of the range hood, the target operating parameters of the variable frequency fan are determined based on the first back pressure to which the range hood is subjected and the air volume of the variable frequency fan of the range hood when subjected to the first back pressure, and then the variable frequency fan is controlled based on the target operating parameters. In particular, when the first back pressure is in the medium back pressure range, the target operating parameters are determined by the first back pressure and the air volume, so that the range hood always maintains an optimal oil fume suction state.

[0063] Figure 3 This is a flow chart of a method for controlling a variable frequency range hood according to another embodiment of the present invention. Based on the above embodiment, this embodiment further refines step S103, as follows: Figure 3 As shown, including:

[0064] S301, determining that a first back pressure is in an intermediate back pressure range, and determining a back pressure change trend based on the first back pressure and a second back pressure obtained in a previous time period;

[0065] In this step, the previous time period refers to a time period adjacent to the time when the first backpressure is obtained, and the second backpressure obtained in this time period includes at least one. For example, if the first backpressure is obtained at time T1, the previous time period refers to the time period before T1-1.

[0066] The backpressure variation trend can be determined based on the difference between the first backpressure and the second backpressure. For example, if the difference between the first backpressure and the second backpressure is greater than zero, it indicates that the backpressure variation trend is gradually increasing; if the difference between the first backpressure and the second backpressure is less than zero, it indicates that the backpressure variation trend is gradually decreasing.

[0067] In some examples, when the back pressure of the range hood increases from the low back pressure range to the medium back pressure range, the back pressure trend is gradually increasing. When the back pressure of the range hood decreases from the high back pressure range to the medium back pressure range, the back pressure trend is gradually decreasing. In other words, when the second back pressure of the range hood is in the medium back pressure range, the back pressure may gradually increase or decrease. When the back pressure gradually increases, the back pressure may rise to the high back pressure range, and when the back pressure gradually decreases, the back pressure may drop to the low back pressure range.

[0068] S302: Determine target operating parameters of the variable frequency fan according to the first back pressure, the air volume, and the back pressure change trend.

[0069] It should be noted that, in the scenario where the back pressure gradually increases, whether the back pressure will rise to the high back pressure interval is also related to the air volume generated by the variable frequency fan. Under the same back pressure, the air volume of the variable frequency fan may be different. When the air volume of the variable frequency fan is large, the back pressure may not rise to the high back pressure interval. When the air volume of the variable frequency fan is small, the back pressure will rise to the high back pressure interval. Similarly, in the scenario where the back pressure gradually decreases, whether the back pressure will drop to the low back pressure interval is also related to the air volume generated by the variable frequency fan. Under the same back pressure, when the air volume of the variable frequency fan is large, the back pressure will drop to the low back pressure interval. When the air volume of the variable frequency fan is small, the back pressure may not drop to the low back pressure interval. Based on this, the embodiment of the present application combines the back pressure change trend, the air volume of the variable frequency fan and the first back pressure to set different variable frequency control methods in the middle back pressure interval to improve the control accuracy of the range hood and improve the control effect of the range hood.

[0070] In some implementations, different operating parameters are set based on different backpressure trends, air volume, and first backpressure. These trends, air volume, first backpressure, and operating parameters are then correlated. After determining the first backpressure, air volume, and backpressure trends, the target operating parameters for the variable frequency fan are obtained using a table lookup. This approach enables more precise control and improves control effectiveness.

[0071] In some implementations, in the medium back pressure range, based on the back pressure change trend, air volume, and the first back pressure, the possibility of the back pressure of the range hood rising to the high back pressure range or falling to the low back pressure range is analyzed, and frequency hopping control is set. For example, when the first back pressure is in the medium back pressure range and has the possibility of rising to the high back pressure range, the variable frequency fan is controlled to jump to the operating parameters corresponding to the high back pressure range; when the first back pressure is in the medium back pressure range and has the possibility of falling to the low back pressure range, the variable frequency fan is controlled to jump to the operating parameters corresponding to the low back pressure range; there is no need to set additional operating parameters, the control logic is simplified, and through the frequency hopping control method, advance control is achieved to achieve rapid changes in the medium back pressure range, rapid adjustment from the low back pressure range to the high back pressure range, which can avoid adjustment lag, and rapid adjustment from the high back pressure range to the low back pressure range, which can save resources and reduce energy waste.

[0072] Specifically, in some implementations, determining target operating parameters of the variable frequency fan according to the first back pressure, the air volume, and the back pressure change trend includes:

[0073] When the back pressure change trend reflects that the back pressure on the range hood is gradually increasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is less than or equal to the first preset air volume threshold, the target operating parameters are determined based on the first operating parameters required by the variable frequency fan when the back pressure on the range hood is in the high back pressure range.

[0074] When the first back pressure is within the medium back pressure range and is greater than or equal to the preset back pressure threshold, and the back pressure trend reflects a gradual increase in the back pressure on the range hood, and the variable frequency fan's air volume is less than or equal to the first preset air volume threshold, indicating that the range hood's current air volume is low, the accumulated back pressure will accelerate the back pressure on the range hood, causing the back pressure to rise to the high back pressure range. Therefore, in this case, it is determined that the range hood's back pressure has the potential to rise to the high back pressure range. The variable frequency fan is controlled in advance to operate according to the first operating parameter associated with the high back pressure range, and the frequency conversion is carried out in advance to increase the static pressure of the variable frequency fan in advance, thereby avoiding the risk of oil fume backflow.

[0075] For example, Figure 4As shown, if the first back pressure is in the medium back pressure range, and the first back pressure is greater than or equal to the preset back pressure threshold C, and the air volume is less than or equal to the first air volume threshold A1, it means that the first back pressure on the range hood is high, and the air volume corresponding to the variable frequency fan is small, and the first back pressure on the range hood will continue to rise along the curve where A1 is located to the high back pressure range. Based on the fact that the first back pressure will continue to rise to the high back pressure range, in order to avoid the aforementioned frequency modulation lag problem, this embodiment skips the frequency modulation process in the medium back pressure range, adjusts the operating parameters of the variable frequency fan to the operating frequency corresponding to the high back pressure range, and increases the static pressure of the variable frequency fan in advance. When the back pressure rises to the back pressure range, the static pressure has been adjusted, and the static pressure is always greater than the back pressure, which can fundamentally avoid the risk of backflow.

[0076] Optionally, the first operating parameter may be a lower limit operating parameter associated with the high back pressure interval.

[0077] In some implementations, determining target operating parameters of the variable frequency fan based on the first back pressure, the air volume, and the back pressure change trend includes:

[0078] When the back pressure change trend reflects that the back pressure on the range hood is gradually increasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is greater than or equal to the second preset air volume threshold, the target operating parameters are determined based on the second operating parameters required by the variable frequency fan when the back pressure on the range hood is in the medium back pressure range.

[0079] If the first backpressure is within the medium backpressure range and is greater than or equal to a preset backpressure threshold, the backpressure trend indicates that the range hood's backpressure is gradually increasing, and the variable frequency fan's air volume is greater than or equal to a second preset air volume threshold, this indicates that the range hood's current air volume is high and sufficient to offset backpressure resistance, preventing backpressure accumulation. Therefore, in this case, the range hood's backpressure is unlikely to rise to the high backpressure range, and frequency hopping control can be omitted. In other words, the range hood can be maintained within the operating parameters corresponding to the medium backpressure range. Therefore, in this embodiment, the target operating parameters are determined based on the second operating parameters required by the variable frequency fan when the range hood's backpressure is within the medium backpressure range.

[0080] For example, Figure 4 As shown, if the first back pressure is in the medium back pressure interval, the first back pressure is greater than or equal to the preset back pressure threshold C, and the air volume is greater than or equal to the second air volume threshold B1, it means that although the range hood is subjected to a large first back pressure, the air volume of the variable frequency fan is relatively large. Under this air volume, the first back pressure will not continue to rise to the high back pressure interval, but will rise to a certain value along the curve where B1 is located, and then it will drop. Therefore, the range hood can be kept running with the operating parameters corresponding to the medium back pressure interval, which improves the range hood's oil fume extraction effect while taking into account energy-saving operation.

[0081] Optionally, the first preset air volume threshold is less than or equal to the second preset air volume threshold. If the first preset air volume threshold is equal to the second preset air volume threshold, then when the air volume is greater than the first preset air volume threshold, the target operating parameter is determined based on the second operating parameter required by the variable frequency fan when the back pressure applied to the range hood is in the medium back pressure range. If the air volume is less than or equal to the first preset air volume threshold, the target operating parameter is determined based on the first operating parameter required by the variable frequency fan when the back pressure applied to the range hood is in the high back pressure range.

[0082] In some embodiments, if the first preset air volume threshold is less than the second preset air volume threshold, then when the air volume is greater than the first preset air volume threshold and less than the second preset air volume threshold, the target operating parameter is determined based on the fourth operating parameter. Optionally, the fourth operating parameter is a pre-set fixed value. Taking the operating parameter including the operating frequency as an example, the fourth operating parameter is less than the first operating parameter, and the fourth operating parameter is greater than the second operating parameter.

[0083] Correspondingly, when the back pressure drops from the high back pressure range to the low back pressure range, the variable frequency fan can be controlled in the following ways:

[0084] In some implementations, determining target operating parameters of the variable frequency fan based on the first back pressure, the air volume, and the back pressure change trend includes:

[0085] When the back pressure change trend reflects that the back pressure on the range hood is gradually decreasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is greater than or equal to the second preset air volume threshold, the target operating parameters are determined based on the third operating parameters required by the variable frequency fan when the back pressure on the range hood is in the low back pressure range.

[0086] When the first back pressure is in the medium back pressure range and is greater than or equal to the preset back pressure threshold, and the back pressure trend reflects a gradual decrease in the range hood's back pressure, and the variable frequency fan's air volume is greater than or equal to the second preset air volume threshold, this indicates that the range hood's current air volume is high, and the back pressure is also gradually decreasing, with a high probability of the back pressure falling into the low back pressure range. Therefore, in this case, frequency hopping control can be used to preemptively control the variable frequency fan to operate according to the third operating parameter associated with the low back pressure range, preemptively changing the frequency, maintaining the range hood's fume extraction efficiency while reducing energy consumption and saving energy.

[0087] In some implementations, determining target operating parameters of the variable frequency fan based on the first back pressure, the air volume, and the back pressure change trend includes:

[0088] When the back pressure change trend reflects that the back pressure on the range hood is gradually decreasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is less than or equal to the first preset air volume threshold, the target operating parameters are determined based on the second operating parameters required for the variable frequency fan when the back pressure on the range hood is in the middle back pressure range.

[0089] When the first back pressure is in the medium back pressure range and is greater than or equal to the preset back pressure threshold, and the back pressure trend reflects a gradual decrease in the back pressure on the range hood, and the variable frequency fan's air volume is less than or equal to the first preset air volume threshold, this indicates that the range hood's current air volume is low. Although the back pressure is also gradually decreasing, the likelihood of the back pressure falling into the low back pressure range is low, and the back pressure is likely to remain in the medium back pressure range. Therefore, in this case, to avoid a back pressure increase caused by frequency hopping adjustment, the variable frequency fan is controlled to maintain the second operating parameters corresponding to the medium back pressure range, allowing the back pressure to drop to the low back pressure range and improve the range hood's oil fume extraction effect.

[0090] In some embodiments, the first preset air volume threshold and the second preset air volume threshold can be pre-set fixed values. For example, based on testing or analyzing the relationship between the back pressure and air volume of the range hood, it is determined that when the back pressure is greater than the preset back pressure threshold, when the back pressure has the possibility of rising to a high back pressure interval, the corresponding air volume critical value of the variable frequency fan is configured as the first preset air volume threshold. Correspondingly, when the back pressure does not have the possibility of rising to a high back pressure interval, the corresponding air volume critical value of the variable frequency fan is configured as the second preset air volume threshold.

[0091] In some embodiments, the first preset air volume threshold and the second preset air volume threshold are related to the size of the back pressure. When the back pressure is different, the corresponding first preset air volume threshold and the second preset air volume threshold are different. That is, the first preset air volume threshold and the second preset air volume threshold are determined based on the back pressure (or static pressure). Specifically, according to each back pressure, when there is a possibility of rising to the high back pressure interval, the corresponding air volume critical value of the variable frequency fan is configured as the first preset air volume threshold, and a first preset air volume threshold set that changes according to the back pressure size is obtained; correspondingly, under each back pressure, when there is no possibility of rising to the high back pressure interval, the corresponding air volume critical value of the variable frequency fan is configured as the second preset air volume threshold, and a second preset air volume threshold set that changes according to the back pressure size is obtained. After obtaining the first back pressure, the first preset air volume threshold and the second preset air volume threshold are determined according to the first back pressure, and then based on the determined first preset air volume threshold and the second preset air volume threshold, the target operating parameters of the variable frequency fan are determined. Since the influence of air volume on the back pressure rising trend is different under different back pressures, this embodiment determines the first preset air volume threshold and the second air volume threshold based on the back pressure, thereby improving the accuracy of judging whether the back pressure rises to the high back pressure range, improving the accuracy of the variable frequency fan control, and improving the oil fume extraction effect of the range hood.

[0092] For example, Figure 2 and Figure 4 As shown, when the first back pressure is 710Pa, the corresponding first preset air volume threshold is A1, and the second preset air volume threshold is B1; when the first back pressure is 730Pa, the corresponding first preset air volume threshold is A2, and the second preset air volume threshold is B2.

[0093] In this embodiment, the oil fume extraction effect of the range hood is improved by more precise control of the variable frequency fan. For example, when the back pressure of the range hood is in the medium back pressure range, if it is predicted that the back pressure is likely to rise to the high back pressure range, the control of the variable frequency fan is accelerated by frequency hopping, which can avoid the risk of oil fume backflow due to adjustment lag. At the same time, when it is predicted that the back pressure is likely to drop to the low back pressure range, the control of the variable frequency fan is accelerated by frequency hopping, which can achieve energy-saving operation and improve the oil fume extraction effect of the range hood.

[0094] Reference Figure 5 Another embodiment of the present application provides a flow chart of a method for controlling a variable frequency range hood. This embodiment is based on all the above embodiments and illustrates the control process of a variable frequency range hood. Figure 5 As shown, the variable frequency range hood control method includes:

[0095] S501, obtaining a first back pressure to which the range hood is subjected during operation, and obtaining an air volume of a variable frequency fan of the range hood when subjected to the first back pressure.

[0096] S502, determining that the first back pressure is in the intermediate back pressure range, determining a back pressure change trend based on the first back pressure and a second back pressure obtained in a previous time period, and determining a first preset air volume threshold and a second preset air volume threshold based on the first back pressure;

[0097] In steps S501 to S502, the method for obtaining the first back pressure and the air volume of the variable frequency fan, the method for determining the back pressure change trend, and the method for determining the first preset air volume threshold and the second preset air volume threshold are the same as those in the above-mentioned embodiment. Please refer to the above-mentioned embodiment for details and will not be repeated here.

[0098] S503, determining whether the first back pressure is greater than or equal to a preset back pressure threshold;

[0099] If yes, then execute S504 to determine whether the air volume is less than or equal to a first preset air volume threshold;

[0100] If so, execute S505 to determine whether the back pressure change trend is that the back pressure gradually increases;

[0101] If the back pressure gradually increases, executing S506, determining a target operating parameter based on the first operating parameter required by the variable frequency fan when the back pressure on the range hood is in the high back pressure range;

[0102] In steps S503 to S506, that is, when the back pressure change trend reflects that the back pressure on the range hood is gradually increasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is less than or equal to the first preset air volume threshold, the target operating parameters are determined based on the first operating parameters required by the variable frequency fan when the back pressure on the range hood is in the high back pressure range.

[0103] If the back pressure gradually decreases, executing S507, determining a target operating parameter based on the second operating parameter required by the variable frequency fan when the back pressure applied to the range hood is in the middle back pressure range;

[0104] In step S507, that is, when the back pressure change trend reflects that the back pressure on the range hood is gradually decreasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is less than or equal to the first preset air volume threshold, the target operating parameters are determined based on the second operating parameters required by the variable frequency fan when the back pressure on the range hood is in the back pressure range.

[0105] If the air volume is greater than the first preset air volume threshold, executing S506 to determine whether the air volume is greater than or equal to the second preset air volume threshold;

[0106] If so, execute S509 to determine whether the back pressure change trend is that the back pressure gradually increases;

[0107] If the back pressure gradually increases, execute S507;

[0108] In steps S506 to S509, that is, when the back pressure change trend reflects that the back pressure on the range hood is gradually increasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is greater than or equal to the second preset air volume threshold, the target operating parameters are determined based on the second operating parameters required by the variable frequency fan when the back pressure on the range hood is in the medium back pressure range.

[0109] If the back pressure gradually decreases, S510 is executed to determine the target operating parameter based on the third operating parameter required by the variable frequency fan when the back pressure to which the range hood is subjected is in the low back pressure range.

[0110] In step S510, that is, when the back pressure change trend reflects that the back pressure on the range hood is gradually decreasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is greater than or equal to the second preset air volume threshold, the target operating parameters are determined based on the third operating parameters required by the variable frequency fan when the back pressure on the range hood is in the low back pressure range.

[0111] S511, controlling the variable frequency fan to operate according to target operating parameters.

[0112] Exemplarily, the operating parameters include operating frequency, etc., and the variable frequency fan is controlled to operate according to the target operating frequency.

[0113] In this embodiment, during the operation of the range hood, the target operating parameters of the variable frequency fan are determined based on the first back pressure to which the range hood is subjected and the air volume of the variable frequency fan of the range hood when subjected to the first back pressure, and then the variable frequency fan is controlled based on the target operating parameters. In particular, when the first back pressure is in the medium back pressure range, the target operating parameters are determined by the first back pressure and the air volume, so that the variable frequency fan is more accurately controlled, thereby improving the oil fume extraction effect of the range hood. For example, when the back pressure to which the range hood is subjected is in the medium back pressure range, if it is predicted that the back pressure is likely to rise to the high back pressure range, the control of the variable frequency fan is accelerated by frequency hopping, thereby avoiding the risk of oil fume backflow due to adjustment lag. At the same time, when it is predicted that the back pressure is likely to drop to the low back pressure range, the control of the variable frequency fan is accelerated by frequency hopping, thereby achieving energy-saving operation and improving the oil fume extraction effect of the range hood.

[0114] like Figure 6 As shown, the embodiment of the present application further provides a variable frequency range hood control device, the control device 60 comprising:

[0115] An acquisition unit 601 is configured to acquire a first back pressure to which the range hood is subjected during operation, and to acquire an air volume of a variable frequency fan of the range hood when subjected to the first back pressure;

[0116] A determination unit 602 is configured to determine whether the first back pressure is within a medium back pressure range, wherein a plurality of back pressure ranges are preset based on a possible back pressure range during operation of the range hood, including a high back pressure range, a medium back pressure range, and a low back pressure range;

[0117] The processing unit 603 is configured to determine target operating parameters of the variable frequency fan according to the first back pressure and the air volume when the judgment unit determines that the first back pressure is in the medium back pressure range;

[0118] The control unit 604 is used to control the variable frequency fan to operate according to target operating parameters.

[0119] The variable frequency range hood control device provided in the embodiment of the present application can execute the various steps involved in the above-mentioned corresponding method embodiments. Its implementation principles and technical effects are similar and will not be repeated here.

[0120] The present application also provides an electronic device, which includes: a memory, a processor, and a camera connection program stored in the memory and runnable on the processor. When the camera connection program is executed by the processor, various embodiments of the above variable frequency range hood control method are implemented.

[0121] In addition, the present application also provides a computer-readable storage medium, on which a camera connection program is stored. When the camera connection program is executed by a processor, the various embodiments of the above-mentioned variable frequency range hood control method are implemented.

[0122] This embodiment further provides a computer program product. When the computer program product is run on a computer, the computer is caused to execute the above-mentioned related steps to implement the various embodiments of the variable frequency range hood control method provided in the above embodiments.

[0123] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0124] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as mentioned above, and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods of each embodiment of the present application.

[0125] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A variable frequency range hood control method, characterized in that: The method comprises: obtaining a first back pressure to which the range hood is subjected during operation, and obtaining an air volume of a variable frequency fan of the range hood when subjected to the first back pressure; determining whether the first back pressure is in a medium back pressure interval, wherein a plurality of back pressure intervals are preset based on a back pressure range that the range hood may be subjected to during operation, including a high back pressure interval, the medium back pressure interval, and a low back pressure interval; If yes, determining target operating parameters of the variable frequency fan according to the first back pressure and the air volume; The variable frequency fan is controlled to operate according to the target operating parameters.

2. The method according to claim 1, wherein The determining, based on the first back pressure and the air volume, target operating parameters of the variable frequency fan includes: determining a backpressure change trend based on the first backpressure and a second backpressure obtained in a previous period; Target operating parameters of the variable frequency fan are determined according to the first back pressure, the air volume, and the back pressure change trend.

3. The method according to claim 2, wherein The determining of target operating parameters of the variable frequency fan according to the first back pressure, the air volume, and the back pressure change trend includes: When the back pressure change trend reflects that the back pressure to which the range hood is subjected is gradually increasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is less than or equal to the first preset air volume threshold, the target operating parameters are determined based on the first operating parameters required by the variable frequency fan when the back pressure to which the range hood is subjected is in the high back pressure range.

4. The method according to claim 3, wherein The determining of target operating parameters of the variable frequency fan according to the first back pressure, the air volume, and the back pressure change trend includes: When the back pressure change trend reflects that the back pressure to which the range hood is subjected is gradually increasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is greater than or equal to the second preset air volume threshold, the target operating parameters are determined based on the second operating parameters required by the variable frequency fan when the back pressure to which the range hood is subjected is in the medium back pressure range, wherein the first preset air volume threshold is less than or equal to the second preset air volume threshold.

5. The method according to claim 3 or 4, wherein: The determining of target operating parameters of the variable frequency fan according to the first back pressure, the air volume, and the back pressure change trend includes: When the back pressure change trend reflects that the back pressure to which the range hood is subjected is gradually decreasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is greater than or equal to the second preset air volume threshold, the target operating parameter is determined based on the third operating parameter required by the variable frequency fan when the back pressure to which the range hood is subjected is in the low back pressure range.

6. The method according to claim 5, wherein The determining of target operating parameters of the variable frequency fan according to the first back pressure, the air volume, and the back pressure change trend includes: When the back pressure change trend reflects that the back pressure to which the range hood is subjected is gradually decreasing, and the first back pressure is greater than or equal to the preset back pressure threshold, and the air volume is less than or equal to the first preset air volume threshold, the target operating parameters are determined based on the second operating parameters required for the variable frequency fan when the back pressure to which the range hood is subjected is in the medium back pressure range.

7. The method according to claim 6, wherein After obtaining the first back pressure to which the range hood is subjected during operation and obtaining the air volume of the variable frequency fan of the range hood when subjected to the first back pressure, the method further includes: The first preset air volume threshold and the second preset air volume threshold are determined according to the first back pressure.

8. A variable frequency range hood control device, characterized in that: The control device comprises: an acquiring unit, configured to acquire a first back pressure to which the range hood is subjected during operation, and to acquire an air volume of a variable frequency fan of the range hood when subjected to the first back pressure; a judgment unit, configured to determine whether the first back pressure is in a medium back pressure interval, wherein a plurality of back pressure intervals are preset based on a back pressure range that the range hood may be subjected to during operation, including a high back pressure interval, a medium back pressure interval, and a low back pressure interval; a processing unit, configured to determine target operating parameters of the variable frequency fan according to the first back pressure and the air volume when the judgment unit determines that the first back pressure is in the medium back pressure range; A control unit is used to control the variable frequency fan to operate according to the target operating parameters.

9. A variable frequency range hood, characterized in that: The variable frequency range hood comprises: a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, which is used to implement the method according to any one of claims 1 to 7 when executed by a processor.

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