Self-cleaning method and device of target range hood and target range hood

Abstract

The invention discloses a self-cleaning method and device for a target range hood and the target range hood. The method comprises the steps that in response to a power-on operation instruction for the target range hood, a first motor is controlled to operate at a target gear, the real-time rotating speed of the first motor within a preset duration is obtained, and a target rotating speed set is obtained; determining a rotating speed change rate of the first motor within a preset time length according to the target rotating speed set, and obtaining an oil contamination coefficient according to the rotating speed change rate; querying a first oil contamination threshold value matched with the target gear in a preset oil contamination threshold value relation library; if the oil contamination coefficient is larger than a first oil contamination threshold value, and the target range hood is in a working stop state, a cleaning agent spraying device and a rotary brush head assembly are controlled to clean the oil contamination on the impeller, and the actual oil fume contamination degree in the range hood is reflected through the rotating speed change rate; self-cleaning is efficiently achieved according to the actual oil smoke contamination degree of the range hood, and the self-cleaning efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the field of range hood control, and in particular, relates to a self-cleaning method and device for a target range hood, and a target range hood. Background Art

[0002] In the process of cooking in the kitchen, the range hood is an indispensable device used to exhaust the fumes generated by cooking. However, during the long-term use of the range hood, its internal impeller, air duct and other parts will gradually be covered with fumes and dirt, resulting in a decline in its performance, such as poor exhaust effect and increased noise.

[0003] At present, most range hoods need to be cleaned manually, which is time-consuming and labor-intensive, and difficult to clean thoroughly. Although some range hoods are equipped with automatic cleaning functions, their cleaning timing is often fixed, and they cannot be accurately cleaned according to the actual degree of oil fume contamination of the range hood. There are problems of excessive cleaning or untimely cleaning, which leads to increased energy consumption or reduced performance of the range hood.

[0004] Therefore, how to efficiently control the range hood to perform self-cleaning is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The present application provides a target range hood self-cleaning method, device and target range hood, which can efficiently control the range hood to perform self-cleaning according to the actual degree of oil fume contamination.

[0006] On the one hand, an embodiment of the present application provides a self-cleaning method for a target range hood, the method comprising:

[0007] In response to a power-on command for a target range hood, the first motor is controlled to operate at a target gear, and the real-time speed of the first motor within a preset time period is obtained to obtain a target speed set; the first motor is used to drive the impeller to rotate;

[0008] Determine the speed change rate of the first motor within the preset time period according to the target speed set, and obtain an oil contamination coefficient according to the speed change rate; the oil contamination coefficient represents the degree of oil contamination on the impeller;

[0009] A first oil contamination threshold value matching the target gear is searched in a preset oil contamination threshold value relationship library; the preset oil contamination threshold value relationship library includes a correspondence between a preset gear and a preset oil contamination threshold value; the preset oil contamination threshold value is used to characterize the corresponding oil contamination degree when the self-cleaning operation needs to be triggered when the first motor is in the preset gear;

[0010] If the oil contamination coefficient is greater than the first oil contamination threshold and the target range hood is in a stopped state, control the cleaner spraying device and the rotating brush head assembly to clean the oil contamination on the impeller.

[0011] In an exemplary embodiment, the obtaining the real-time rotation speeds of the first motor within a preset duration to obtain a target rotation speed set includes:

[0012] Determine the moment of receiving the power-on operation instruction as the start moment of timing and start timing;

[0013] During the timing, detect the rotation speed difference between the real-time rotation speed at the current moment and the real-time rotation speed at the previous moment;

[0014] If the rotation speed difference is less than the rotation speed difference threshold, determine that the timing ends and obtain the end moment of timing;

[0015] Determine the multiple real-time rotation speeds obtained from the start moment of timing to the end moment of timing as the target rotation speed set.

[0016] In an exemplary embodiment, the method further includes:

[0017] Obtain the voltage values at both ends of the first motor from the start moment of timing to the end moment of timing to obtain a voltage set;

[0018] Detect the difference between the voltage values at any two adjacent moments in the voltage set. If the difference is less than or equal to the voltage fluctuation threshold, increase the real-time rotation speeds corresponding to the any two adjacent moments to the target rotation speed set.

[0019] In an exemplary embodiment, the cleaner spraying device includes a pressure pump and a rotating nozzle; the if the oil contamination coefficient is greater than the first oil contamination threshold and the target range hood is in a stopped state, control the cleaner spraying device and the rotating brush head assembly to clean the oil contamination on the impeller includes:

[0020] In the case where the target range hood is in a stopped state, determine the oil contamination coefficient as the current oil contamination coefficient;

[0021] If the current oil contamination coefficient is greater than the first oil contamination threshold, control the cleaner spraying device and the rotating brush head assembly to clean the oil contamination on the impeller within a preset cleaning duration;

[0022] When the cleaning duration reaches the preset cleaning duration, control the target range hood to run again at the target gear and determine the oil contamination coefficient corresponding to the real-time rotation speeds of the first motor obtained within the preset duration;

[0023] Re - use the oil contamination coefficient as the current oil contamination coefficient; jump to execute the step of controlling the cleaning agent spraying device and the rotating brush head assembly to clean the oil stains on the impeller within a preset cleaning duration until a preset end condition is met, if the current oil contamination coefficient is greater than the first oil contamination threshold.

[0024] In an exemplary embodiment, the cleaning agent spraying device includes a pressure pump and a rotating nozzle; the rotating brush head assembly includes a second motor and a cleaning brush; the step of controlling the cleaning agent spraying device and the rotating brush head assembly to clean the oil stains on the impeller within a preset cleaning duration includes:

[0025] Control the pressure pump to atomize the cleaning agent;

[0026] Control the rotating nozzle to spray the atomized cleaning agent onto the blades inside the impeller to dissolve the oil stains on the blades;

[0027] Control the second motor to rotate in a first rotation direction to drive the cleaning brush to contact and peel off the dissolved oil stains on the first surface of the blade;

[0028] When the second motor rotates in the first rotation direction for a first duration, control the second motor to rotate in a second rotation direction to drive the cleaning brush to contact and peel off the dissolved oil stains on the second surface of the blade;

[0029] When the second motor rotates in the second rotation direction for a second duration, determine that the target range hood has completed self - cleaning; the sum of the first duration and the second duration is the preset cleaning duration.

[0030] In an exemplary embodiment, the preset end condition includes reaching a preset number of cleaning times; the method further includes:

[0031] If the target range hood's self - cleaning reaches the preset number of cleaning times, obtain the current oil contamination coefficient of the first motor;

[0032] If the current oil contamination coefficient of the first motor is greater than the first oil contamination threshold, generate a reminder message;

[0033] Send the reminder message to a target terminal; the target terminal is used to display the reminder message to remind the user to perform manual cleaning on the target range hood.

[0034] In an exemplary embodiment, if the current oil stain contamination coefficient is greater than a second oil stain contamination threshold, the second oil stain contamination threshold is greater than the first oil stain contamination threshold, and the difference between the second oil stain contamination threshold and the first oil stain contamination threshold is greater than a preset value, the method further includes:

[0035] Controlling the second motor to rotate in the first rotation direction;

[0036] When the second motor rotates in the first rotation direction for a third duration, controlling the second motor to rotate in the second rotation direction; the third duration is greater than the first duration;

[0037] When the second motor rotates in the second rotation direction for a fourth duration, determining that the target range hood has completed self-cleaning; the fourth duration is greater than the second duration.

[0038] On the other hand, the present application also provides a self-cleaning device for a target range hood, and the device includes:

[0039] A target speed set determination module, configured to, in response to a power-on operation instruction for the target range hood, control the first motor to operate at a target gear, and obtain real-time speeds of the first motor within a preset duration to obtain a target speed set; the first motor is used to drive the impeller to rotate;

[0040] An oil stain contamination coefficient determination module, configured to determine a speed change rate of the first motor within the preset duration according to the target speed set, and obtain an oil stain contamination coefficient according to the speed change rate; the oil stain contamination coefficient characterizes the degree of oil stain contamination on the impeller;

[0041] A threshold query module, configured to query a first oil stain contamination threshold matching the target gear in a preset oil stain contamination threshold relationship library; the preset oil stain contamination threshold relationship library includes a correspondence between a preset gear and a preset oil stain contamination threshold; the preset oil stain contamination threshold is used to characterize the degree of oil stain contamination corresponding to triggering a self-cleaning operation when the first motor is in the preset gear;

[0042] A self-cleaning module, configured to, if the oil stain contamination coefficient is greater than the first oil stain contamination threshold and the target range hood is in a stopped working state, control a cleaning agent spraying device and a rotating brush head assembly to clean the oil stains on the impeller.

[0043] On the other hand, the present application also provides a target range hood, which includes a first motor, an impeller, a cleaning device, and a controller; the cleaning device includes a cleaning agent spraying device and a rotating brush head assembly; the first motor is connected to the impeller through an output shaft, and the first motor is used to drive the impeller to rotate; the controller is electrically connected to the cleaning device; the controller is used to control the range hood to perform self-cleaning according to the method embodiment described above.

[0044] In an exemplary embodiment, the cleaning agent spraying device includes a pressure pump and a rotating nozzle; the rotating brush head assembly includes a second motor and a cleaning brush; the second motor is electrically connected to the controller; the second motor is fixed on the volute in the direction opposite to the axis of the first motor; the cleaning brush is connected to the second motor through a telescopic arm.

[0045] On the other hand, the present application also provides an electronic device, which includes a processor and a memory. At least one instruction or at least one program segment is stored in the memory, and the at least one instruction or the at least one program segment is loaded and executed by the processor to implement the self-cleaning method of the target range hood described above.

[0046] On the other hand, the present application also provides a computer storage medium, which stores at least one instruction or at least one program segment, and the at least one instruction or the at least one program segment is loaded and executed by a processor to implement the self-cleaning method of the target range hood described above.

[0047] On the other hand, the present application also provides a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes to implement the self-cleaning method of the target range hood described above.

[0048] The self-cleaning method of the target range hood provided by the present application has the following technical effects:

[0049] In the embodiments of the present application, in response to the power-on operation instruction for the target range hood, the first motor is controlled to operate at the target gear, and the real-time rotation speed of the first motor within the preset duration is acquired to obtain the target rotation speed set; the rotation speed change rate of the first motor within the preset duration is determined according to the target rotation speed set, and the oil stain contamination coefficient is obtained according to the rotation speed change rate; the oil stain contamination coefficient characterizes the degree of oil stain contamination on the impeller; the first oil stain contamination threshold matching the target gear is queried in the preset oil stain contamination threshold relationship library; if the oil stain contamination coefficient is greater than the first oil stain contamination threshold and the target range hood is in the stopped working state, the cleaning agent spraying device and the rotating brush head assembly are controlled to clean the oil stains on the impeller. By using the rotation speed change rate to reflect the actual oil fume contamination degree inside the range hood, the self-cleaning is efficiently realized according to the actual oil fume contamination degree of the range hood. On the one hand, over-cleaning is avoided, and on the other hand, the situation of untimely cleaning is also avoided. In the embodiments of the present application, the cleaning agent spraying device and the rotating brush head assembly are used to clean the oil stains on the impeller. Compared with the volute heating method, the self-cleaning efficiency of the range hood can be further improved by the combined chemical and physical cleaning method of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0051] Figure 1 is a schematic structural diagram of the target range hood provided by the embodiments of the present application;

[0052] Figure 2 is a schematic flowchart of the self-cleaning method of the target range hood provided by the embodiments of the present application;

[0053] Figure 3 is a schematic flowchart of controlling the target range hood to perform self-cleaning provided by the embodiments of the present application;

[0054] Figure 4 is a schematic flowchart of the self-cleaning process of the target range hood within one cleaning cycle provided by the embodiments of the present application;

[0055] Figure 5 is a schematic flowchart of controlling the second motor provided by the embodiments of the present application;

[0056] Figure 6 is a schematic structural diagram of the self-cleaning device of the target range hood provided by the embodiments of the present application;

[0057] Figure 7It is a hardware structure block diagram of a server for a self - cleaning method of a target range hood provided by an embodiment of the present application. Detailed implementation manners

[0058] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0059] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above - mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non - exclusive inclusion. For example, a process, method, system, product or server including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0060] Figure 1 It is a schematic structural diagram of the target range hood provided by an embodiment of the present application. As Figure 1 shown, the target range hood provided by the embodiment of the present application includes a first motor 1, an impeller 2, a cleaning device and a controller; the cleaning device includes a cleaning agent spraying device and a rotating brush head assembly; the first motor 1 is connected to the impeller 2 through an output shaft, and the first motor 1 is used to drive the impeller 2 to rotate; the controller is electrically connected to the cleaning device; the controller is used to control the target range hood to perform self - cleaning.

[0061] In an exemplary implementation manner, the cleaning agent spraying device includes a pressure pump and a rotating nozzle; it should be noted that the rotating nozzle can be arranged at the axis center of the output shaft of the first motor 1. The rotating nozzle can be a 360 - degree rotating nozzle, which can spray out the cleaning agent and cover the surface of the impeller 2 to dissolve the oil stains on the impeller 2.

[0062] The rotating brush head assembly includes a second motor 31 and a cleaning brush 32; the second motor 31 is electrically connected to the controller; the second motor 31 is fixed on the volute in the direction opposite to the axis of the first motor 1; the cleaning brush 32 is connected to the second motor 31 through a telescopic arm 33. The second motor 31 is used to control the rotation of the cleaning brush 32 so that the cleaning brush 32 moves axially along the impeller to achieve full coverage cleaning. The cleaning brush 32 can use bristles made of nylon or soft rubber, and during high-speed rotation, it rubs against the blade surface of the impeller 2 to peel off the dissolved oil stains. The second motor 31 can rotate forward and backward to better remove stains. It should be noted that the cleaning brush 32 is a detachable component and can be replaced manually.

[0063] Figure 2 It is a schematic flow chart of the self-cleaning method of the target range hood provided by the embodiment of the present application.

[0064] S201: In response to the power-on operation instruction for the target range hood, control the first motor to operate at the target gear, and obtain the real-time speed of the first motor within a preset duration to obtain a target speed set;

[0065] Wherein, the first motor is used to drive the impeller to rotate;

[0066] The first motor can be the first motor 1 as Figure 1 shown. The power-on operation instruction may include the target gear. When different gears are set, the speeds that the first motor needs to reach are also different. Taking the first motor as a DC brushless motor as an example, by adjusting the pulse width of the excitation signal driving the first motor, the first motor can work at different gears. Specifically, by using pulse width modulation technology to adjust the duty cycle of the excitation signal. In another implementation, the first motor can also work at different gears by changing the voltage value across the first motor.

[0067] During the operation of the first motor, the real-time speed of the first motor can be collected according to a preset acquisition period to obtain a target speed set.

[0068] In one implementation, the real-time speed of the first motor can be collected by a sensor.

[0069] S203: Determine the speed change rate of the first motor within the preset duration according to the target speed set, and obtain an oil stain contamination coefficient according to the speed change rate;

[0070] Wherein, the oil stain contamination coefficient characterizes the degree of oil stain contamination on the impeller;

[0071] The rate of change of rotational speed represents the change in rotational speed per unit time. The set of target rotational speeds includes the rotational speeds corresponding to multiple acquisition moments within a preset duration. In one implementation, the rotational speeds corresponding to multiple acquisition moments can be fitted to obtain a functional expression of rotational speed with respect to time. Then, by taking the derivative of this functional expression, the rate of change of the rotational speed of the first motor within the preset duration can be obtained. This rate of change of rotational speed can reflect the degree of oil contamination on the impeller.

[0072] It should be noted that, without considering the influence of oil contamination factors, the ideal rotational speed of the first motor can be expressed by the following formula:

[0073]

[0074] where n represents the rotational speed, V represents the input voltage, I represents the motor current, R represents the internal resistance of the motor, and Ke represents the back electromotive force constant.

[0075] The rate of change of rotational speed can be expressed by the following formula:

[0076]

[0077] where represents the rate of change of rotational speed, V represents the input voltage, R represents the internal resistance of the motor, Ke represents the back electromotive force constant, Kt represents the torque constant, ω represents the angular velocity, J represents the moment of inertia, and T load represents the load torque.

[0078] From the above formula for the rate of change of rotational speed, it can be concluded that the more oil there is, the heavier the blades, the greater the moment of inertia, and the smaller the rate of change of rotational speed; in addition, if the load on the motor increases and the load torque is greater, it will also cause the rate of change of rotational speed to be smaller and the rotational speed to change more slowly.

[0079] Therefore, by determining the actual rate of change of rotational speed, the degree of oil contamination can be determined. At the same gear position, the smaller the rate of change of rotational speed, the greater the degree of oil fume contamination, that is, the greater the oil contamination coefficient.

[0080] S205: Query the first oil contamination threshold that matches the target gear position in the preset oil contamination threshold relationship library;

[0081] where the preset oil contamination threshold relationship library includes the corresponding relationship between the preset gear position and the preset oil contamination threshold; the preset oil contamination threshold is used to characterize the degree of oil contamination corresponding to triggering the self-cleaning operation when the first motor is in the preset gear position;

[0082] The preset oil stain contamination threshold relationship library can be set through experiments and actual requirements. Different preset gears correspond to different preset oil stain contamination thresholds. In one implementation, the preset oil stain contamination threshold relationship library can be a library in the form of a formula, a table, or other forms including the corresponding relationship between the preset gear and the preset oil stain contamination threshold; if the preset oil stain contamination threshold relationship library is a formula, substitute the ideal speed of the first motor corresponding to the target gear into the formula to obtain the first oil stain contamination threshold; if the preset oil stain contamination threshold relationship library is a table, input the ideal speed of the first motor corresponding to the target gear into the preset oil stain contamination threshold relationship library to obtain the first oil stain contamination threshold corresponding to the target gear.

[0083] S207: If the oil stain contamination coefficient is greater than the first oil stain contamination threshold and the target range hood is in a stopped working state, control the cleaner spraying device and the rotating brush head assembly to clean the oil stains on the impeller.

[0084] If the oil stain contamination coefficient is greater than the first oil stain contamination threshold, it is determined that the self-cleaning operation can be triggered. When the target range hood is in a stopped working state, perform self-cleaning. It should be noted that since the self-cleaning method of this application is applied to the target range hood as Figure 1 shown, therefore, this application controls the cleaner spraying device and the rotating brush head assembly in the target range hood to clean the oil stains on the impeller. The cleaner spraying device can spray the cleaner to dissolve the oil stains on the impeller, and the rotating brush head assembly can peel off the dissolved oil stains. It should be noted that the cleaner can be a high-temperature alkaline solution.

[0085] In the embodiment of this application, in response to the power-on operation instruction for the target range hood, control the first motor to operate in the target gear, and obtain the real-time speed of the first motor within a preset time period to obtain a set of target speeds; determine the speed change rate of the first motor within the preset time period according to the set of target speeds, and obtain the oil stain contamination coefficient according to the speed change rate; this oil stain contamination coefficient represents the degree of oil stain contamination on the impeller; query the first oil stain contamination threshold matching the target gear in the preset oil stain contamination threshold relationship library; if the oil stain contamination coefficient is greater than the first oil stain contamination threshold and the target range hood is in a stopped working state, control the cleaner spraying device and the rotating brush head assembly to clean the oil stains on the impeller. By using the speed change rate to reflect the actual oil fume contamination degree inside the range hood, it efficiently realizes self-cleaning according to the actual oil fume contamination degree of the range hood. On the one hand, it avoids over-cleaning, and on the other hand, it also avoids the situation of untimely cleaning. In the embodiment of this application, the cleaner spraying device and the rotating brush head assembly are used to clean the oil stains on the impeller. Compared with the cleaning method of vortex shell heating in the prior art, the chemical plus physical combination cleaning method of this application can further improve the self-cleaning efficiency of the range hood.

[0086] In one embodiment, obtaining the real-time rotational speed of the first motor within a preset time period to obtain a target rotational speed set may include:

[0087] Determine the moment when the power-on operation instruction is received as the start moment of timing and start timing;

[0088] During the timing, detect the rotational speed difference between the real-time rotational speed at the current moment and the real-time rotational speed at the previous moment; in an example, if the T-th acquisition moment is the current moment, the difference between the rotational speeds at the T-th acquisition moment and the (T - 1)-th acquisition moment can be detected;

[0089] If the rotational speed difference is less than the rotational speed difference threshold, determine that the timing ends and obtain the end moment of timing; when the rotational speed difference is less than the rotational speed difference threshold, it can be considered that the rotational speed reaches stability and the target range hood enters a stable working state;

[0090] In one embodiment, it can also be detected whether the rotational speed differences between the rotational speeds at the preset consecutive acquisition moments and the previous acquisition moment are all less than the rotational speed difference threshold. If satisfied, determine that the timing ends;

[0091] Determine the multiple real-time rotational speeds obtained from the start moment of timing to the end moment of timing as the target rotational speed set.

[0092] In the embodiments of the present application, by detecting the real-time rotational speed and the rotational speed difference of the first motor of the target range hood, the rotational speeds collected during the period from when the target range hood is powered on to reaching the stable operation state are obtained, so as to obtain the target rotational speed set, which is convenient for subsequent fitting processing of the rotational speed values, making the fitted rotational speed change rate more accurate.

[0093] In one embodiment, the method provided by the present application may further include:

[0094] Obtain the voltage values at both ends of the first motor from the start moment of timing to the end moment of timing to obtain a voltage set;

[0095] Detect the difference between the voltage values at any two adjacent moments in the voltage set. If the difference is less than or equal to the voltage fluctuation threshold, increase the real-time rotational speeds corresponding to the any two adjacent moments to the target rotational speed set.

[0096] It should be noted that the voltage fluctuation threshold can be determined according to the actual detection accuracy, for example, it can be 0.1V, etc. When the voltage fluctuates, the rotational speed value of the first motor will also become abnormal. For example, the rotational speed suddenly increases or suddenly decreases, and these abnormal values will affect the fitting accuracy of the subsequent rotational speed change rate. In the embodiment of the present application, by adding the rotational speed value collected at the moment when the voltage is stable to the target rotational speed set, the influence caused by voltage fluctuation is avoided, abnormal rotational speed values are eliminated, and the accuracy of the rotational speed change rate is improved.

[0097] In one embodiment, the cleaning agent spraying device may include a pressure pump and a rotating nozzle. Figure 3 It is a schematic flowchart of controlling the target range hood to perform self-cleaning provided by the embodiment of the present application. As Figure 3 shown, if the oil stain contamination coefficient is greater than the first oil stain contamination threshold and the target range hood is in a stopped working state, controlling the cleaning agent spraying device and the rotating brush head assembly to clean the oil stains on the impeller may include:

[0098] S301: When the target range hood is in a stopped working state, determine the oil stain contamination coefficient as the current oil stain contamination coefficient;

[0099] The stopped working state of the target range hood means that the first motor stops working. In one implementation, in response to the exhaust end instruction for the target range hood, the target range hood can be controlled to be in a stopped working state;

[0100] S303: If the current oil stain contamination coefficient is greater than the first oil stain contamination threshold, control the cleaning agent spraying device and the rotating brush head assembly to clean the oil stains on the impeller within a preset cleaning duration;

[0101] If the current oil stain contamination coefficient is greater than the first oil stain contamination threshold δn1, it is determined at this time that the target range hood needs to perform self-cleaning. In the present application, the cleaning agent spraying device and the rotating brush head assembly are controlled to clean the oil stains on the impeller within a preset cleaning duration. In one implementation, the preset cleaning duration can be a fixed duration, such as 2 minutes; in another implementation, the preset cleaning duration can be determined according to the current oil stain contamination coefficient, and the greater the current oil stain contamination coefficient, the longer the preset cleaning duration.

[0102] S305: When the cleaning duration reaches the preset cleaning duration, control the target range hood to run again at the target gear, and determine the oil stain contamination coefficient corresponding to the real-time rotational speed of the first motor obtained within the preset duration;

[0103] When the cleaning duration reaches the preset cleaning duration, it can be determined that the target range hood has completed a self-cleaning operation. To detect the self-cleaning effect, the present application further controls the target range hood to operate again at the target gear, and determines the oil stain contamination coefficient corresponding to the real-time rotation speed of the first motor obtained within the preset duration. The obtaining process is similar to step S201 and will not be elaborated here.

[0104] S307: Reuse the oil stain contamination coefficient as the current oil stain contamination coefficient; jump to execute the step of controlling the cleaner spraying device and the rotating brush head assembly to clean the oil stains on the impeller within the preset cleaning duration until the preset end condition is met.

[0105] It should be noted that after the preset end condition is reached, a cleaning completion message can be sent. The present application does not limit the specific form of the cleaning completion message. For example, it can be to control the user panel of the target range hood to flash a light for prompt, or a sound prompt, etc.

[0106] In the embodiment of the present application, by detecting the oil stain contamination coefficient again after completing a self-cleaning, it is thus possible to judge whether to perform self-cleaning again or end the self-cleaning according to the oil stain contamination coefficient, so as to be able to flexibly judge whether subsequent cleaning procedures are needed according to the actual cleaning effect. On the one hand, it reduces energy consumption and is beneficial to energy conservation and environmental protection; on the other hand, it effectively improves the self-cleaning efficiency of the target range hood and realizes the efficient control of the self-cleaning of the target range hood.

[0107] In one embodiment, the cleaner spraying device includes a pressure pump and a rotating nozzle; the rotating brush head assembly includes a second motor and a cleaning brush; Figure 4 is a schematic diagram of the self-cleaning process of the target range hood within a cleaning cycle provided by the embodiment of the present application. As Figure 4 shown, the step of controlling the cleaner spraying device and the rotating brush head assembly to clean the oil stains on the impeller within the preset cleaning duration may include:

[0108] S401: Control the pressure pump to atomize the cleaner;

[0109] In one implementation, the cleaner can be a high-temperature alkaline solution;

[0110] It should be noted that before atomization, the temperature of the cleaner can be obtained through a temperature sensor; if the temperature is less than the preset temperature, the cleaner is heated and then atomized to improve the cleaning ability of the cleaner.

[0111] S403: Control the rotating nozzle to spray the atomized cleaner on the blades inside the impeller to dissolve the oil stains on the blades;

[0112] In one implementation, the rotary sprinkler can be mounted on the top of the output shaft of the first motor. In another implementation, the rotary sprinkler can also be mounted on the top of the output shaft of the second motor to achieve the effect of full coverage spraying.

[0113] S405: Control the second motor to rotate in the first rotation direction to drive the cleaning brush to contact and strip the dissolved oil stains on the first surface of the blade;

[0114] The cleaning brush can be the cleaning brush 32 as Figure 1 shown; the first rotation direction can be the clockwise direction, and the second motor drives the cleaning brush to contact and strip the dissolved oil stains on the first surface of the blade.

[0115] S407: When the second motor rotates in the first rotation direction for a first duration, control the second motor to rotate in the second rotation direction to drive the cleaning brush to contact and strip the dissolved oil stains on the second surface of the blade;

[0116] The first duration can be determined according to the actual cleaning requirements; in one example, the first duration can be 30 seconds. The second rotation direction can be the counterclockwise direction, and the second motor drives the cleaning brush to contact and strip the dissolved oil stains on the second surface of the blade.

[0117] It should be noted that if the first rotation direction is the counterclockwise direction, correspondingly, the second rotation direction can be the clockwise direction.

[0118] S409: When the second motor rotates in the second rotation direction for a second duration, determine that the target range hood has completed self-cleaning; the sum of the first duration and the second duration is the preset cleaning duration.

[0119] The second duration can also be determined according to the actual cleaning requirements; the second duration can be the same as or different from the first duration; in one example, the second duration can be 30 seconds.

[0120] In the embodiments of the present application, by spraying the cleaning agent and scrubbing the surface of the blade with the cleaning brush, the oil stains on the blade can be dissolved and stripped, so as to achieve a good cleaning effect. By cleaning the blade in the first rotation direction and the second rotation direction, the self-cleaning efficiency of the target range hood is effectively improved.

[0121] Figure 5It is a schematic flowchart of controlling the second motor provided by an embodiment of the present application. If the current oil stain contamination coefficient is greater than the second oil stain contamination threshold δn2, the second oil stain contamination threshold δn2 is greater than the first oil stain contamination threshold δn1, and the difference between the second oil stain contamination threshold δn2 and the first oil stain contamination threshold δn1 is greater than a preset value, as Figure 5 shown, the method further includes:

[0122] S501: Control the second motor to rotate in the first rotation direction;

[0123] Similar to step S405, the first rotation direction can be the clockwise direction.

[0124] S503: When the second motor rotates in the first rotation direction for a third duration, control the second motor to rotate in the second rotation direction;

[0125] Wherein, the third duration is greater than the first duration; if the current oil stain contamination coefficient is greater than the second oil stain contamination threshold δn2, the present application increases the cleaning duration to achieve a better cleaning effect; for example, when the first duration is 30 seconds, the third duration can be 45 seconds;

[0126] Similar to step S405, the second rotation direction can be the counterclockwise direction.

[0127] S505: When the second motor rotates in the second rotation direction for a fourth duration, determine that the target range hood has completed self-cleaning;

[0128] Wherein, the fourth duration is greater than the second duration. For example, when the second duration is 30 seconds, the fourth duration can be 45 seconds. The present application does not limit the specific values of the third duration and the fourth duration, which can be determined according to actual cleaning requirements. At this time, the sum of the third duration and the fourth duration is the preset cleaning duration.

[0129] In an embodiment of the present application, if the current oil stain contamination coefficient is not only greater than the first oil stain contamination threshold, but further greater than the second oil stain contamination threshold, it indicates that the degree of oil stain contamination is relatively large. At this time, by increasing the cleaning duration, the cleaning requirements can be better met, and a good self-cleaning effect can be achieved.

[0130] In one embodiment, the preset end condition includes reaching a preset number of cleaning times; the method further includes:

[0131] If the target range hood self-cleans to reach the preset number of cleaning times, obtain the current oil stain contamination coefficient of the first motor;

[0132] In the embodiment of the present application, after the second motor completes cleaning in the second rotation direction, it can be regarded as completing one self-cleaning. The preset number of cleaning times can be three, that is, after performing three times according to the Figure 4 method shown, the current oil stain contamination coefficient of the first motor can be detected and obtained again;

[0133] If the current oil stain contamination coefficient of the first motor is greater than the first oil stain contamination threshold, a reminder message is generated;

[0134] The reminder message is sent to the target terminal; the target terminal is used to display the reminder message to remind the user to perform manual cleaning on the target range hood.

[0135] In the embodiment of the present application, after the cleaning reaches the preset number of cleaning times, the present application detects the current oil stain contamination coefficient again. When the current oil stain contamination coefficient is still greater than the first oil stain contamination threshold, it indicates that the cleaning process has not achieved the ideal effect, and there may be reasons such as insufficient cleaning agent or low cleaning agent temperature. Therefore, the user is reminded to perform manual cleaning in time to avoid oil stain accumulation and ensure the normal use of the target range hood.

[0136] Figure 6 is a schematic structural diagram of a self-cleaning device for a target range hood provided by an embodiment of the present application. The device 600 may include:

[0137] A target speed set determination module 601, configured to, in response to a power-on operation instruction for the target range hood, control the first motor to operate at a target gear, and obtain the real-time speed of the first motor within a preset duration to obtain a target speed set; the first motor is used to drive the impeller to rotate;

[0138] An oil stain contamination coefficient determination module 602, configured to determine the speed change rate of the first motor within the preset duration according to the target speed set, and obtain an oil stain contamination coefficient according to the speed change rate; the oil stain contamination coefficient characterizes the degree of oil stain contamination on the impeller;

[0139] A threshold query module 603, configured to query a first oil stain contamination threshold matching the target gear in a preset oil stain contamination threshold relationship library; the preset oil stain contamination threshold relationship library includes the corresponding relationship between a preset gear and a preset oil stain contamination threshold; the preset oil stain contamination threshold is used to characterize the degree of oil stain contamination corresponding to triggering a self-cleaning operation when the first motor is in the preset gear;

[0140] A self-cleaning module 604, configured to, if the oil stain contamination coefficient is greater than the first oil stain contamination threshold and the target range hood is in a stopped working state, control a cleaning agent spraying device and a rotating brush head assembly to clean the oil stains on the impeller.

[0141] In some embodiments, the target speed set determination module may include:

[0142] A start time determination sub-module, configured to determine the time when the power-on operation instruction is received as the start time of timing and start timing;

[0143] A speed difference detection sub-module, configured to detect the speed difference between the real-time speed at the current moment and the real-time speed at the previous moment during the timing;

[0144] An end time determination sub-module, configured to determine the end of timing and obtain the end time of timing if the speed difference is less than the speed difference threshold;

[0145] A target speed set determination sub-module, configured to determine the multiple real-time speeds obtained from the start time of timing to the end time of timing as the target speed set.

[0146] In some embodiments, the target speed set determination module may include:

[0147] A voltage set determination sub-module, configured to obtain the voltage values at both ends of the first motor from the start time of timing to the end time of timing to obtain a voltage set;

[0148] A voltage fluctuation detection sub-module, configured to detect the difference between the voltage values at any two adjacent moments in the voltage set, and if the difference is less than or equal to the voltage fluctuation threshold, add the real-time speeds corresponding to the any two adjacent moments to the target speed set.

[0149] In some embodiments, the cleaning agent spraying device includes a pressure pump and a rotary nozzle; the self-cleaning module includes:

[0150] A current oil stain contamination coefficient determination sub-module, configured to determine the oil stain contamination coefficient as the current oil stain contamination coefficient when the target range hood is in a stopped working state;

[0151] A self-cleaning sub-module, configured to control the cleaning agent spraying device and the rotary brush head assembly to clean the oil stains on the impeller within a preset cleaning duration if the current oil stain contamination coefficient is greater than the first oil stain contamination threshold;

[0152] A gear operation sub-module, configured to control the target range hood to operate again in the target gear when the cleaning duration reaches the preset cleaning duration, and determine the oil stain contamination coefficient corresponding to the real-time speed of the first motor obtained within the preset duration;

[0153] A cleaning sub-module for reusing the oil contamination coefficient as the current oil contamination coefficient; jumping to execute the step of controlling the detergent spraying device and the rotating brush head assembly to clean the oil stains on the impeller within a preset cleaning duration until a preset end condition is met if the current oil contamination coefficient is greater than the first oil contamination threshold.

[0154] In some embodiments, the detergent spraying device includes a pressure pump and a rotating nozzle; the rotating brush head assembly includes a second motor and a cleaning brush; the self-cleaning sub-module includes:

[0155] An atomization unit for controlling the pressure pump to atomize the detergent;

[0156] A spraying unit for controlling the rotating nozzle to spray the atomized detergent on the blades inside the impeller to dissolve the oil stains on the blades;

[0157] A first rotation control unit for controlling the second motor to rotate in a first rotation direction to drive the cleaning brush to contact and peel off the dissolved oil stains on the first surface of the blade;

[0158] A second rotation control unit for controlling the second motor to rotate in a second rotation direction when the second motor rotates in the first rotation direction for a first duration to drive the cleaning brush to contact and peel off the dissolved oil stains on the second surface of the blade;

[0159] A self-cleaning completion confirmation unit for determining that the target range hood has completed self-cleaning when the second motor rotates in the second rotation direction for a second duration; the sum of the first duration and the second duration is the preset cleaning duration.

[0160] In some embodiments, the preset end condition includes reaching a preset cleaning times; the self-cleaning module may include:

[0161] A current oil contamination coefficient determination sub-module for obtaining the current oil contamination coefficient of the first motor if the self-cleaning of the target range hood reaches the preset cleaning times;

[0162] A reminder information generation sub-module for generating reminder information if the current oil contamination coefficient of the first motor is greater than the first oil contamination threshold;

[0163] A reminder information sending sub-module for sending the reminder information to a target terminal; the target terminal is used to display the reminder information to remind the user to perform manual cleaning on the target range hood.

[0164] In some embodiments, if the current oil stain contamination coefficient is greater than a second oil stain contamination threshold, the second oil stain contamination threshold is greater than the first oil stain contamination threshold, and the difference between the second oil stain contamination threshold and the first oil stain contamination threshold is greater than a preset value, the self-cleaning sub-module further includes:

[0165] A rotation control unit, configured to control the second motor to rotate in the first rotation direction;

[0166] A third rotation control unit, configured to control the second motor to rotate in the second rotation direction when the second motor rotates in the first rotation direction for a third duration; the third duration is greater than the first duration;

[0167] A fourth rotation control unit, configured to determine that the target range hood has completed self-cleaning when the second motor rotates in the second rotation direction for a fourth duration; the fourth duration is greater than the second duration.

[0168] The device in the device embodiment and the method embodiment are based on the same inventive concept.

[0169] An embodiment of the present application further provides an electronic device, which includes a processor and a memory. At least one instruction or at least one program segment is stored in the memory, and the at least one instruction or at least one program segment is loaded and executed by the processor to implement the method provided in the above method embodiment.

[0170] An embodiment of the present application further provides a computer storage medium, which can be set in a terminal to store at least one instruction or at least one program segment related to implementing the method provided in the above method embodiment. The at least one instruction or at least one program segment is loaded and executed by the processor to implement the method provided in the above method embodiment.

[0171] An embodiment of the present application further provides a computer program product or a computer program, which includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes to implement the method provided in the above method embodiment.

[0172] Optionally, in the embodiments of the present application, the storage medium may be located in at least one of multiple network servers of a computer network. Optionally, in this embodiment, the above storage medium may include, but is not limited to, various media that can store program codes, such as USB flash drives, read-only memories (ROMs), random access memories (RAMs), mobile hard disks, magnetic disks, or optical discs.

[0173] The memory in the embodiments of the present application can be used to store software programs and modules. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory. The memory mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for functions, etc.; the data storage area can store data created according to the use of the device, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices. Correspondingly, the memory may further include a memory controller to provide the processor with access to the memory.

[0174] The method provided by the embodiments of the present application can be executed on a mobile terminal, a computer terminal, a server, or a similar computing device. Taking running on a server as an example, Figure 7 is a hardware structure block diagram of a server for a self-cleaning method of a target range hood provided by the embodiments of the present application. As Figure 7As shown, the server 700 can vary significantly due to configuration or performance differences. It can include one or more central processing units (CPUs) 710 (the central processing unit 710 can include, but is not limited to, processing devices such as a microprocessor MCU or a field-programmable gate array FPGA), a memory 730 for storing data, and one or more storage media 720 for storing application programs 723 or data 722 (such as one or more mass storage devices). Among them, the memory 730 and the storage media 720 can be transient storage or persistent storage. The program stored in the storage media 720 can include one or more modules, and each module can include a series of instruction operations on the server. Further, the central processing unit 710 can be set to communicate with the storage media 720 and execute a series of instruction operations in the storage media 720 on the server 700. The server 700 can also include one or more power supplies 760, one or more wired or wireless network interfaces 750, one or more input / output interfaces 740, and / or one or more operating systems 721, such as Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, etc.

[0175] The input / output interface 740 can be used to receive or send data via a network. Specific examples of the above network can include the wireless network provided by the communication provider of the server 700. In one example, the input / output interface 740 includes a network interface controller (NIC), which can be connected to other network devices through a base station and thus communicate with the Internet. In one example, the input / output interface 740 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0176] Those of ordinary skill in the art can understand that Figure 7 the structure shown is only schematic and does not limit the structure of the above electronic device. For example, the server 700 can also include more or fewer components than Figure 7 shown, or have a different configuration from Figure 7 shown.

[0177] As can be seen from the embodiments of the self-cleaning method, device, and target range hood provided by the present application above, in response to the power-on operation instruction for the target range hood, the present application controls the first motor to operate at a target gear, and obtains the real-time rotation speed of the first motor within a preset duration to obtain a target rotation speed set; determines the rotation speed change rate of the first motor within the preset duration according to the target rotation speed set, and obtains an oil stain contamination coefficient according to the rotation speed change rate; this oil stain contamination coefficient characterizes the degree of oil stain contamination on the impeller; queries the first oil stain contamination threshold matching the target gear in the preset oil stain contamination threshold relationship library; if the oil stain contamination coefficient is greater than the first oil stain contamination threshold and the target range hood is in a stopped working state, controls the cleaning agent spraying device and the rotating brush head assembly to clean the oil stains on the impeller, and reflects the actual oil fume contamination degree inside the range hood through the rotation speed change rate, efficiently realizing self-cleaning according to the actual oil fume contamination degree of the range hood. On the one hand, it avoids over-cleaning, and on the other hand, it also avoids the situation of untimely cleaning, can extend the service life of the range hood, reduce the maintenance cost, and at the same time reduce the frequency of manual cleaning by users, improving the user experience. In the embodiments of the present application, the cleaning agent spraying device and the rotating brush head assembly are used to clean the oil stains on the impeller. Compared with the way of volute heating, the present application can further improve the self-cleaning efficiency of the range hood through a chemical plus physical combined cleaning method.

[0178] It should be noted that: the above sequence of the embodiments of the present application is only for description and does not represent the superiority or inferiority of the embodiments. And the above specifically describes a specific embodiment of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be executed in a different order from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0179] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the embodiments of the device, equipment, and storage medium, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiments.

[0180] Those of ordinary skill in the art can understand that all or part of the steps to implement the above embodiments can be completed by hardware, or can be completed by a program instructing relevant hardware. The program can be stored in a computer storage medium, and the above-mentioned storage medium can be a read-only memory, a disk, an optical disc, etc.

[0181] The above are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A self-cleaning method for a range hood, characterized in that: The method comprises: In response to a power-on command for a target range hood, the first motor is controlled to operate at a target gear, and the real-time speed of the first motor within a preset time period is obtained to obtain a target speed set; the first motor is used to drive the impeller to rotate; Determine the speed change rate of the first motor within the preset time period according to the target speed set, and obtain an oil contamination coefficient according to the speed change rate; the oil contamination coefficient represents the degree of oil contamination on the impeller; A first oil contamination threshold value matching the target gear is searched in a preset oil contamination threshold value relationship library; the preset oil contamination threshold value relationship library includes a correspondence between a preset gear and a preset oil contamination threshold value; the preset oil contamination threshold value is used to characterize the corresponding oil contamination degree when the self-cleaning operation needs to be triggered when the first motor is in the preset gear; If the oil contamination coefficient is greater than the first oil contamination threshold and the target range hood is in a stopped state, the detergent spraying device and the rotating brush head assembly are controlled to clean the oil on the impeller.

2. The method according to claim 1, characterized in that The step of acquiring the real-time rotation speed of the first motor within a preset time period to obtain a target rotation speed set includes: Determine the time of receiving the power-on operation instruction as the timing start time, and start timing; During the timing, the speed difference between the real-time speed at the current moment and the real-time speed at the previous moment is detected; If the speed difference is less than the speed difference threshold, it is determined that the timing is over, and the timing end time is obtained; A plurality of real-time rotational speeds acquired between the timing start time and the timing end time are determined as the target rotational speed set.

3. The method according to claim 2, characterized in that The method further comprises: Obtaining voltage values ​​at both ends of the first motor from the timing start time to the timing end time to obtain a voltage set; The difference between the voltage values ​​at any two adjacent moments in the voltage set is detected, and if the difference is less than or equal to the voltage fluctuation threshold, the real-time rotation speed corresponding to the any two adjacent moments is increased to the target rotation speed set.

4. The method according to claim 1, characterized in that: The detergent spraying device comprises a pressure pump and a rotating nozzle; if the oil contamination coefficient is greater than the first oil contamination threshold and the target range hood is in a stopped working state, controlling the detergent spraying device and the rotating brush head assembly to clean the oil on the impeller comprises: When the target range hood is in a stopped working state, determining the oil pollution coefficient as a current oil pollution coefficient; If the current oil contamination coefficient is greater than the first oil contamination threshold, controlling the detergent spraying device and the rotating brush head assembly to clean the oil on the impeller within a preset cleaning time; When the cleaning time reaches the preset cleaning time, the target range hood is controlled to run at the target gear again, and the oil contamination coefficient corresponding to the real-time rotation speed of the first motor obtained within the preset time is determined; The oil contamination coefficient is re-used as the current oil contamination coefficient; if the current oil contamination coefficient is greater than the first oil contamination threshold, the execution is jumped to the step of controlling the detergent spraying device and the rotating brush head assembly to clean the oil on the impeller within a preset cleaning time until a preset end condition is met.

5. The method according to claim 4, characterized in that The detergent spraying device includes a pressure pump and a rotating spray head; the rotating brush head assembly includes a second motor and a cleaning brush; and the cleaning agent spraying device and the rotating brush head assembly are controlled within a preset cleaning time to clean the oil stains on the impeller, including: Controlling the pressure pump to atomize the cleaning agent; Controlling the rotating nozzle to spray the atomized cleaning agent onto the blades inside the impeller to dissolve the oil stains on the blades; Controlling the second motor to rotate in a first rotation direction to drive the cleaning brush to contact and peel off the dissolved oil stains on the first surface of the blade; When the second motor rotates in the first rotation direction for a first time period, controlling the second motor to rotate in a second rotation direction to drive the cleaning brush to contact and peel off the dissolved oil stains on the second surface of the blade; When the second motor rotates in the second rotation direction for a second time period, it is determined that the target range hood has completed self-cleaning; the sum of the first time period and the second time period is the preset cleaning time period.

6. The method according to claim 4, characterized in that The preset end condition includes reaching a preset number of cleaning times; the method further includes: If the self-cleaning of the target range hood reaches the preset cleaning times, obtaining the current oil contamination coefficient of the first motor; If the current oil contamination coefficient of the first motor is greater than the first oil contamination threshold, generating a reminder message; The reminder information is sent to a target terminal; the target terminal is used to display the reminder information to remind the user to manually clean the target range hood.

7. The method according to claim 5, characterized in that If the current oil pollution coefficient is greater than a second oil pollution threshold, the second oil pollution threshold is greater than the first oil pollution threshold, and the difference between the second oil pollution threshold and the first oil pollution threshold is greater than a preset value, the method further includes: controlling the second motor to rotate in the first rotation direction; When the second motor rotates in the first rotation direction for a third time period, controlling the second motor to rotate in the second rotation direction; the third time period is greater than the first time period; When the second motor rotates in the second rotation direction for a fourth time period, it is determined that the target range hood has completed self-cleaning; and the fourth time period is greater than the second time period.

8. A self-cleaning device for a range hood, characterized in that: The device comprises: a target speed set determination module, for responding to a power-on operation instruction for a target range hood, controlling the first motor to operate at a target gear, and acquiring a real-time speed of the first motor within a preset time to obtain a target speed set; the first motor is used to drive the impeller to rotate; an oil contamination coefficient determination module, configured to determine a speed change rate of the first motor within the preset time period according to the target speed set, and obtain an oil contamination coefficient according to the speed change rate; the oil contamination coefficient represents the degree of oil contamination on the impeller; A threshold query module, used to query a first oil contamination threshold value matching the target gear in a preset oil contamination threshold relationship library; the preset oil contamination threshold relationship library includes a correspondence between a preset gear and a preset oil contamination threshold value; the preset oil contamination threshold value is used to characterize the corresponding oil contamination degree when the self-cleaning operation needs to be triggered when the first motor is in the preset gear; The self-cleaning module is used to control the detergent spraying device and the rotating brush head assembly to clean the oil on the impeller if the oil contamination coefficient is greater than the first oil contamination threshold and the target range hood is in a stopped state.

9. A target range hood, characterized in that: The target range hood comprises a first motor, an impeller, a cleaning device and a controller; the cleaning device comprises a detergent spraying device and a rotating brush head assembly; the first motor is connected to the impeller via an output shaft, and the first motor is used to drive the impeller to rotate; the controller is electrically connected to the cleaning device; The controller is used to control the range hood to perform self-cleaning according to the method described in any one of claims 1 to 7.

10. The method according to claim 9, characterized in that The detergent spraying device includes a pressure pump and a rotating nozzle; the rotating brush head assembly includes a second motor and a cleaning brush; the second motor is electrically connected to the controller; the second motor is fixed on a vortex casing in a direction opposite to the axis of the first motor; the cleaning brush is connected to the second motor through a telescopic arm.

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