Air purifier control method and device and air purifier

Abstract

The invention relates to the technical field of intelligent control, and discloses an air purifier control method and device and an air purifier. The method comprises the steps that height information of a reference object in a current purification area is obtained; according to the method, the height information of the reference object is obtained, the target air inlet system is determined in the multiple air inlet systems with the different heights of the air purifier according to the height information, and the target air inlet system is started, the height information of the reference object is obtained, and the target air inlet system is determined and started in the multiple air inlet systems with the different heights according to the height information; the air purifier can be automatically matched with the air inlet with the corresponding height according to the actual height of a reference object, the air inlet height is matched with a personnel activity area, targeted purification can be achieved, unnecessary waste is reduced, and the air purifier belongs to the technical field of high efficiency and energy conservation in the energy-saving and environment-friendly industry.

Description

Technical Field

[0001] This invention relates to the field of intelligent control technology, specifically to an air purifier control method, device, and air purifier. Background Technology

[0002] As air quality deteriorates, the harmful components in the air pose an increasing risk to human health, leading to greater public concern about air pollution. Air purifiers effectively remove indoor air pollution and improve air quality in homes. However, in a home environment, the relative positions of the breathing areas of individuals at different heights (such as adults, children, and pets) and the air intake of the device vary. Existing purifiers have limitations in this scenario, exhibiting issues such as poor targeted purification, fan idling, and high energy consumption, failing to meet the energy-saving and environmental protection industry's technical requirements for high efficiency, energy saving, and intelligent purification. Summary of the Invention

[0003] This invention provides an air purifier control method, device, and air purifier to solve the problems of related air purifiers being unable to correlate with the user's actual activity perception capabilities, resulting in low purification efficiency and energy waste, as well as being unable to adapt to the breathing areas of people at different heights and having poor purification effects.

[0004] In a first aspect, the present invention provides an air purifier control method, the method comprising: acquiring the height information of a reference object in the current purification area; determining a target air intake system among multiple air intake systems of different heights in the air purifier based on the height information, and activating the target air intake system.

[0005] Based on the aforementioned technical means, by acquiring the height information of a reference subject and determining and activating the target air intake system among multiple air intake systems at different heights, the air purifier can automatically match the air intake at the corresponding height according to the actual height of the reference subject. This avoids the drawback of fixed-height air intake, which cannot meet the purification needs of people of different heights, and improves the targeting of purification. By acquiring the height information of the reference subject and automatically matching the corresponding height air intake system, ineffective air intake and high-load operation of the fan are avoided, thus improving the level of energy saving and environmental protection.

[0006] In one optional implementation, the method further includes: acquiring activity status information of a reference object; and controlling the fan speed of the air purifier based on the activity status information.

[0007] Based on the aforementioned technical means, by acquiring the activity status information of the reference object and controlling the fan speed according to this activity status information, the air purifier can dynamically adjust the fan operating intensity according to the actual activity level of the reference object. This avoids the drawback of keeping the fan speed at the same level and being unable to adapt to changes in activity status, thus coordinating the operating status with the current scene. By dynamically adjusting the fan speed in conjunction with the activity status of personnel, the high efficiency and energy-saving characteristics are enhanced, making this invention conform to the technical orientation and product requirements of the energy-saving and environmental protection industry and the high efficiency and energy-saving industry.

[0008] In one optional implementation, a target air intake system is determined from multiple air intake systems at different heights in the air purifier based on height information. This includes: matching the height range corresponding to each air intake system with the height information, and determining the corresponding target air intake system based on the target height range into which the height information falls. The height range is a range parameter determined longitudinally based on the setting height of the air intake system on the air purifier.

[0009] Based on the above technical means, by pre-defining the corresponding height range for each air intake system and matching the height information of the reference object with the height range to determine the target air intake system, the selection of the air intake system has a clear quantitative basis, realizing the accurate correspondence between height information and air intake system selection, and improving the accuracy and operability of air intake system selection.

[0010] In one optional implementation, the air purifier includes an upper air intake system located in the upper half of the main body and a lower air intake system located in the lower half of the main body. The system matches the height range corresponding to each air intake system with the user's height information, and determines the corresponding target air intake system based on the target height range within which the height information falls. Based on the user's height, the system selects to activate the upper air intake system and / or the lower air intake system, including: activating the upper air intake system and deactivating the lower air intake system when the user's height information is greater than a preset height threshold; activating the lower air intake system and deactivating the upper air intake system when the user's height information is less than or equal to the preset height threshold; and activating both the upper and lower air intake systems simultaneously when there are multiple users with height information greater than and less than or equal to the preset height threshold.

[0011] Based on the above technical means, by comparing height information with a preset height threshold, the upper air intake system is activated when the height is high, the lower air intake system is activated when the height is low, and the upper and lower air intake systems are activated simultaneously when multiple heights exist at the same time. This allows the opening and closing status of the air intake system to match the height distribution of the reference object, achieving precise air delivery in a single scene and comprehensive coverage in multiple scenes.

[0012] In one optional implementation, if the height information in multiple consecutive sampling periods is greater than a preset height threshold, it is determined that the height information is greater than the preset height threshold; if the height information in multiple consecutive sampling periods is less than or equal to the preset height threshold, it is determined that the height information is less than or equal to the preset height threshold.

[0013] The embodiments of the present invention determine the final judgment result only when the height information in multiple consecutive sampling periods meets the same condition, avoiding misjudgment caused by instantaneous detection errors or brief changes in the posture of the reference object, making the switching decision of the air intake system more stable and reliable, and improving the robustness of control.

[0014] In one optional implementation, the activity status information includes the target distance from the reference object to the air purifier and / or the target speed of the reference object. Controlling the fan speed of the air purifier according to the activity status information includes: controlling the fan speed of the air purifier according to a first mapping relationship and / or a second mapping relationship, wherein the first mapping relationship indicates that the target distance and the fan speed are negatively correlated, and the second mapping relationship indicates that the target speed and the fan speed are positively correlated.

[0015] Based on the above technical means, the fan speed is controlled by establishing a mapping relationship between the target distance and the fan speed, which is negatively correlated with the target speed and positively correlated with the fan speed. This allows the fan operating intensity to be comprehensively adjusted based on both the distance and speed of the reference object, avoiding the response deviation that may occur when adjusting based on only a single factor.

[0016] In one optional implementation, controlling the fan speed of the air purifier according to a first mapping relationship and / or a second mapping relationship includes: calculating a first control value based on the first mapping relationship and a target distance, wherein the first control value is negatively correlated with the target distance and positively correlated with the fan speed; calculating a second control value based on the second mapping relationship and a target speed, wherein the second control value is positively correlated with the target speed and positively correlated with the fan speed; obtaining a speed control value by weighted summing of the first control value and the second control value; and determining the current fan speed according to the matching relationship between the speed control value and the control value range corresponding to each speed.

[0017] Based on the above methods, the fan speed is controlled by establishing a mapping relationship between the target distance and the fan speed, which is negatively correlated with the target distance and positively correlated with the fan speed. This allows the fan operating intensity to be comprehensively adjusted based on both the distance and speed of the reference object, avoiding the response deviation that occurs when adjusting based on only a single factor. The fan speed control value is obtained by calculating the first and second control values ​​and performing a weighted sum. Then, the fan speed is determined based on the matching relationship between the fan speed control value and the range of control values ​​for each speed. This allows the influence of the target distance and target speed on the fan speed to be quantified into a unified control value for comprehensive evaluation, achieving a smooth conversion from detection data to discrete fan speeds.

[0018] In one optional implementation, before controlling the fan speed of the air purifier according to the first mapping relationship and / or the second mapping relationship, the method further includes: determining whether the target distance is greater than a preset distance threshold; when the target distance is greater than the preset distance threshold, controlling the fan speed based on the current environmental pollutant concentration; when the target distance is less than or equal to the preset distance threshold, performing the step of controlling the fan speed of the air purifier according to the first mapping relationship and / or the second mapping relationship.

[0019] Based on the aforementioned technical means, by determining whether the target distance is greater than a preset distance threshold, the fan speed is controlled based on pollutant concentration when the reference object is in the far field, and the fan speed is controlled based on mapping relationship when the reference object is in the near field. This enables the air purifier to automatically switch control strategies according to the distance of the reference object, taking into account the needs of two different scenarios: overall environmental purification and targeted near-field response.

[0020] Secondly, the present invention provides an air purifier control device, the device comprising: a height information acquisition module for acquiring the height information of a reference object in the current purification area; and a target air intake system determination module for determining the target air intake system among multiple air intake systems of different heights in the air purifier based on the height information, and activating the target air intake system.

[0021] Thirdly, the present invention provides an air purifier, comprising: a main body; an upper air intake system disposed on the upper part of the main body, including an upper fan and an upper filter; a lower air intake system disposed on the lower part of the main body, including a lower fan and a lower filter; a sensor array for acquiring user information in the environment surrounding the purifier, the user information including at least the user's height, the distance between the user and the purifier, and the user's activity speed; and a control module connected to the sensor array, the upper air intake system, and the lower air intake system respectively, for executing an air purifier control method according to the first aspect or any corresponding embodiment thereof. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the first process of an air purifier control method according to an embodiment of the present invention; Figure 2 This is a second flowchart illustrating an air purifier control method according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a first specific embodiment of an air purifier control method according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a second specific embodiment of an air purifier control method according to an embodiment of the present invention; Figure 5 This is a structural block diagram of an air purifier control device according to an embodiment of the present invention; Figure 6 This is a schematic diagram of an air purifier according to an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In the field of air purification equipment control, air purifiers in related technologies usually adopt a fixed-height air intake structure, that is, the air intake is set at a fixed position on the body. Regardless of the height of the people in the purification area, the air intake position remains unchanged. This setting method has obvious shortcomings in actual use.

[0028] When the air inlet is positioned high, the purified air cannot be directly delivered to the breathing zone of shorter children or people who are sitting or lying down, greatly reducing the purification effect. Conversely, when the air inlet is positioned low, the airflow cannot effectively cover the activity area of ​​taller adults.

[0029] In addition, the fan speed adjustment of air purifiers in related technologies mostly relies on manual operation by the user or is automatically adjusted only based on the concentration of pollutants, failing to take into account the actual activity status of people in the purification area.

[0030] When people are actively moving around in the area, the air quality requirements are high. If the fan is still running at a low speed at this time, it cannot respond quickly to the purification needs. When people are stationary, if the fan is still running at a high speed, it will generate unnecessary operating noise and energy waste.

[0031] Furthermore, even if some devices can detect the presence of people, they often rely on only a single dimension of information for control, such as simply detecting whether a person is nearby to decide whether to turn on or off. This lacks comprehensive application of multi-dimensional information such as height, distance, and movement speed, resulting in a rather coarse control strategy that struggles to achieve precise adjustments. Therefore, air purifiers in related technologies have room for improvement in areas such as air intake height adaptation, dynamic fan speed adjustment, and multi-dimensional information fusion control.

[0032] According to an embodiment of the present invention, an embodiment of an air purifier control method is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0033] This embodiment provides an air purifier control method, which can be used in the aforementioned air purifier. Figure 1 This is a flowchart of an air purifier control method according to an embodiment of the present invention, such as... Figure 1 As shown, the process includes the following steps: Step S101: Obtain the height information of the reference object in the current purification area.

[0034] Step S102: Based on the height information, determine the target air intake system from the multiple air intake systems of different heights in the air purifier, and turn on the target air intake system.

[0035] Specifically, the system obtains the height information of a reference object within the current purification area. The purification area refers to the area being monitored by the air purifier, such as a common indoor area being monitored, like a living room or bedroom. The reference object is a person or animal within this purification area, and the height information refers to the vertical distance from the top of the reference object's head to the bottom. The height information can be obtained through convenient everyday operations, such as using the air purifier's built-in infrared height detection function. When the reference object stands within the designated monitoring area of ​​the purifier, the device will automatically measure and record the height data. For example, in the detection area of ​​a bedroom, if the reference object is an adult who is 165 cm tall, the air purifier can obtain the height information of 165 cm through infrared detection.

[0036] Based on the obtained height information, the target air intake system is determined among the multiple air intake systems of the air purifier at different heights, and the target air intake system is activated. The air intake system is the component in the air purifier responsible for drawing in the air to be purified. Multiple air intake systems at different heights mean that the purifier has multiple air inlets, and the installation height of these air inlets is different.

[0037] In one example, some air intake systems are located at the bottom of the purifier (30 cm from the ground), while others are located at the top (120 cm from the ground). Determining the target air intake system involves selecting a system suitable for the height of the reference subject. Activating the target air intake system means turning on the selected system. For example, if the reference subject in the monitored area is 165 cm tall, the air intake system located at the top of the purifier (120 cm from the ground) is selected as the target system. This system is then activated to allow it to operate normally and draw in air from the bedroom for purification. Similarly, if the monitored area is a children's room and the reference subject is a child 90 cm tall, the air intake system located at the bottom of the purifier (30 cm from the ground) is selected as the target system after obtaining the 90 cm height information. This system is then activated to ensure the air intake position is appropriate for the child's height and suits everyday use.

[0038] This embodiment provides an air purifier control method that acquires the height information of a reference object in the current purification area and determines and activates a target air intake system from multiple air intake systems at different heights based on this height information. This allows the air purifier to automatically match the air intake at the appropriate height according to the actual height of the reference object. For example, when a tall adult is detected, the air intake system located at a higher position on the top of the purifier is automatically activated, adapting the air intake position to the adult's breathing zone height. When a short child or pet is detected, the air intake system located at a lower position on the bottom of the purifier is automatically activated, bringing the air intake closer to the child's activity area. This avoids the drawback of traditional air purifiers that use a fixed air intake height and cannot meet the purification needs of people of different heights. It allows purified air to be delivered more specifically to the vertical height area where the reference object is located, improving the effectiveness and comfort of purification. It also avoids wasted purification effect due to the mismatch between the air intake height and the person's height, making the operation of the air purifier more closely aligned with actual usage scenarios.

[0039] In one alternative implementation, the method further includes: Step a1: Obtain the activity status information of the reference object.

[0040] Step a2: Control the fan speed of the air purifier according to the activity status information.

[0041] Specifically, the activity status information of the reference object is acquired. This activity status information refers to data that reflects the movement status and activity level of the reference object within the current purification area, and may include dimensions such as the reference object's moving speed, distance from the air purifier, dwell time, and activity frequency. This information can be obtained through the sensor array mounted on the air purifier.

[0042] The air purifier's fan speed is controlled based on the acquired activity status information. The fan speed level corresponds to the fan's operating power; different levels correspond to different fan speeds and airflow rates. Higher speed levels mean faster fan speeds and increased air circulation within the purification area. The core logic of fan speed control is to match activity status with purification needs. When the activity status information indicates the reference object is active, such as moving around frequently or with high activity frequency, the fan speed is increased to a high level to enhance airflow and purification rate, quickly replacing the air in the purification area. When the activity status information indicates the reference object is stationary, such as sitting for long periods or lying down with low activity frequency, the fan speed is reduced to a medium-low level to decrease fan speed, ensuring basic purification effects while minimizing energy consumption.

[0043] In one example, user states are categorized into eight typical scenarios based on activity status information, as shown in the table below:

[0044] The air purifier uses a sensor array to collect the target distance and speed of a reference object in real time, matching it to the corresponding scenario in the nine states mentioned above, and then precisely adjusting the fan speed: When matching scenarios S1 and S5, the reference object is in a static state, so the fan speed is adjusted to low speed to maintain basic purification effect and reduce energy consumption; when matching scenarios S2 and S6, the reference object is in a slow-moving state, so the fan speed is adjusted to medium-low speed to balance purification and quietness; when matching scenarios S3 and S7, the reference object is in a medium-speed activity state, so the fan speed is adjusted to medium speed to improve the purification rate; when matching scenarios S4 and S8, the reference object is in a fast-moving state, so the fan speed is adjusted to high speed to quickly replace the air; when matching scenario S9, the reference object is in a long-distance activity state, so the fan speed is no longer adjusted based on distance and speed, but instead based on the current pollutant concentration in the environment.

[0045] Optionally, PWM intelligent gradual control technology is used when switching gears. By adjusting the duty cycle of the motor power supply, the wind speed is gradually changed, avoiding sudden noise changes.

[0046] In one example, the reference object is identified as an active individual 95 centimeters tall. If the sensor detects that this individual is continuously running and jumping within the purification area, classifying their activity as vigorous exercise, the air purifier will adjust its fan speed to high to increase the airflow and exhaust speed, thus quickly responding to dust or air disturbances that may be caused by vigorous activity. Conversely, if the sensor detects that the child is sitting quietly on a mat looking at a picture book, classifying their activity as still, the air purifier will switch the fan speed to low or silent mode, maintaining air purification while reducing operating noise to avoid disturbing the child's activities. If the detected activity is mild, such as a child walking slowly or playing with building blocks, the air purifier can set the fan speed to medium, achieving a balance between purification effectiveness and noise level.

[0047] The air purifier control method provided in this invention obtains the activity status information of a reference object and controls the fan speed of the air purifier according to the activity status information. This allows the air purifier to dynamically adjust the fan's operating intensity based on the actual activity status of the reference object. By obtaining the activity information of the reference object, the state of the reference object is determined. When the reference object is active, the fan speed is increased accordingly to match the greater purification demand; when the reference object is stationary, the fan speed is decreased accordingly, so that the operating state is coordinated with the current scene. This avoids the drawback of the fan speed always remaining at the same level and being unable to adapt to changes in the activity status of the reference object. The air purifier's operation can adaptively adjust to the actual state of the reference object. By obtaining the height information of the reference object and automatically matching the corresponding height air intake system, ineffective air intake and high-load operation of the fan are avoided, improving energy saving and environmental protection.

[0048] In one optional implementation, the activity status information includes the target distance from the reference object to the air purifier and / or the target speed of the reference object, and step a2 includes: Step a21: Control the fan speed of the air purifier according to the first mapping relationship and / or the second mapping relationship. The first mapping relationship indicates that the target distance and the fan speed are negatively correlated, and the second mapping relationship indicates that the target speed and the fan speed are positively correlated.

[0049] Specifically, the system acquires information about the activity status of a reference object, including the target distance from the reference object to the air purifier and / or the target speed of the reference object. The target distance refers to the spatial interval between the reference object's location within the purification area and the air purifier body. This distance can be obtained using infrared ranging sensors, ultrasonic sensors, or cameras combined with depth information algorithms. The target speed refers to the distance the reference object moves per unit time, reflecting its speed of movement. It is typically obtained by continuously detecting position changes at multiple time points and calculating the differences. For example, when the air purifier tracks an active object moving in the room using a camera, it can not only calculate in real time whether the object is one meter or three meters away from the machine, but also determine whether it is walking slowly or running quickly, thus obtaining specific distance and speed values.

[0050] In one example, the air purifier considers both the target distance and the target speed. Assuming a child is initially sitting quietly two meters away from the purifier (target distance is two meters, target speed is close to zero), the first mapping relationship (medium to near distance corresponds to medium speed) and the second mapping relationship (very low speed corresponds to low speed) combine to set the fan speed to medium-low. Subsequently, the child begins running around the room, the target distance varying from one meter to three meters, while the target speed increases to 1.2 meters per second. At this point, the first mapping relationship (closer distance) requires a higher speed, and the second mapping relationship (higher speed) also requires a higher speed. The combined effect of these two factors causes the air purifier to adjust the fan speed to high speed to quickly respond to the high-intensity activity. If a child runs past the air purifier at a very close distance but without slowing down, both mapping relationships point to the high setting, and the fan continues to run at high speed. When the child stops and walks to a distant corner to rest, the target distance increases and the target speed returns to zero, and both mapping relationships point to the low setting, causing the fan speed to drop to a low setting.

[0051] The air purifier control method provided in this invention obtains the target distance from the reference object to the air purifier and the target speed of the reference object, and controls the fan speed according to a first mapping relationship and a second mapping relationship. The target distance is negatively correlated with the fan speed, and the target speed is positively correlated with the fan speed. This allows the air purifier to adjust the fan speed based on both the distance to and the speed of the reference object. When the reference object is close, the fan speed is increased; when the distance is far, the fan speed is decreased. When the reference object moves quickly, the fan speed is increased; when the speed is slow, the fan speed is decreased. This allows the fan speed adjustment to comprehensively reflect the spatial position and movement state of the reference object, avoiding response deviations that may occur when adjusting based on a single factor. This makes the fan speed adjustment more closely match the actual activity scenario of the reference object. By dynamically adjusting the fan speed in conjunction with the activity state of personnel, the high-efficiency and energy-saving characteristics are enhanced, making this invention conform to the technical guidance and product requirements of the energy-saving and environmental protection industry.

[0052] In one alternative implementation, step a21 includes: Step b1: Calculate the first control value based on the first mapping relationship and the target distance. The first control value is negatively correlated with the target distance and positively correlated with the fan speed.

[0053] Step b2: Calculate the second control value based on the second mapping relationship and the target speed. The second control value is positively correlated with the target speed and also positively correlated with the fan speed.

[0054] Step b3: Weighted summation of the first control value and the second control value yields the gear control value.

[0055] Step b4: Determine the current fan speed based on the matching relationship between the speed control value and the corresponding control value range of each speed.

[0056] Specifically, after obtaining the target distance from the reference object to the air purifier and the target speed of the reference object, a first control value is first calculated based on a first mapping relationship and the target distance. The first mapping relationship stipulates a negative correlation between the target distance and the first control value; that is, the smaller the target distance, the larger the calculated first control value; and the larger the target distance, the smaller the first control value. Simultaneously, the first control value itself is positively correlated with the fan speed, meaning that the magnitude of the first control value directly reflects the intensity of the demand for a specific fan speed; the higher the value, the higher the corresponding fan speed should be. The negative correlation can be achieved in various ways during calculation, such as setting a baseline value minus the product of the target distance and a coefficient, or using the reciprocal of the distance multiplied by a preset gain.

[0057] Simultaneously, a second control value is calculated based on the second mapping relationship and the target speed. The second mapping relationship stipulates a positive correlation between the target speed and the second control value; that is, the faster the target speed, the larger the second control value; and the slower the target speed, the smaller the second control value. Furthermore, the second control value is also positively correlated with the fan speed setting, and its value reflects the degree of demand for that fan speed setting. For example, when the target speed of the reference object is detected to reach 1.5 meters per second, indicating rapid movement, the second control value calculated according to the second mapping relationship is 1.2; if the reference object is stationary and the target speed is zero, the second control value is calculated to be zero or an extremely low value.

[0058] After obtaining the first and second control values, they are weighted and summed to obtain the gear control value. During the weighted summation, different weight coefficients can be assigned to the first and second control values ​​to reflect the difference in importance between target distance and target speed in the final decision. The specific values ​​of the weight coefficients can be preset according to the air purifier's usage scenario or user preferences. For example, in a home environment, distance may be a more important factor, so the weight of the first control value might be set higher; while in frequently used locations, speed may be a more important factor, so the weight of the second control value might be increased.

[0059] After obtaining the control value for each fan speed, the current fan speed is determined based on the matching relationship between this control value and the corresponding control value range for each speed. The air purifier pre-defined the control value range for each fan speed.

[0060] In one example, the purification demand index (i.e., the gear control value) is defined as I=W. d ×f(d)+W v ×g(v), where: f(d) (first control value): distance function. The closer the distance, the higher the required value. f(d) = 1 / (d+0.1), where d is the target distance from the reference object to the air purifier. Adding 0.1 to the denominator is to prevent the denominator from being 0.

[0061] g(v) (second control value): speed function. The higher the speed, the greater the demand. g(v) = v, where v is the speed value. W d W v Adjustable weighting coefficients (default values ​​are 0.4 and 0.6 respectively), which users can set themselves.

[0062] The gear mapping rules are as follows: I<0.3: Level 1 (airflow 10%) 0.3≤I<0.6: Level 2 (30% airflow); 0.6≤I<0.9: Level 3 (60% airflow); I≥0.9: Level 4 (air volume above 90%).

[0063] The air purifier control method provided in this invention calculates a first control value based on a first mapping relationship and a target distance, calculates a second control value based on a second mapping relationship and a target speed, and then weights and sums the first and second control values ​​to obtain a speed control value. Finally, the current fan speed is determined according to the matching relationship between the speed control value and the corresponding control value range of each speed. This allows the influence of the two factors, target distance and target speed, on the fan speed to be quantified into a unified control value for comprehensive evaluation. By using a weighted summation method, the weight ratio of the two factors in the decision-making process can be adjusted according to actual needs, making the calculation of the speed control value more flexible. Ultimately, continuous speed control values ​​are mapped to preset speed control value ranges, achieving a smooth conversion from detection data to discrete fan speeds, and making the fan speed determination process have a clear calculation basis and repeatability.

[0064] In one alternative implementation, prior to step a21, the following steps are included: Step c1: Determine whether the target distance is greater than a preset distance threshold; Step c2: When the target distance is greater than the preset distance threshold, control the fan speed based on the current environmental pollutant concentration.

[0065] Step c3: When the target distance is less than or equal to the preset distance threshold, execute the step of controlling the fan speed of the air purifier according to the first mapping relationship and / or the second mapping relationship.

[0066] Specifically, before controlling the fan speed according to the first and second mapping relationships, it is first necessary to determine the acquired target distance, that is, whether the target distance is greater than a preset distance threshold. The preset distance threshold is a pre-set distance value used to define the critical point of distance between the reference object and the air purifier. For example, it can be set to two meters or three meters. The specific value is determined according to the installation environment of the air purifier, the applicable area, and the design goals. The significance of the threshold is to distinguish whether the reference object is in the near-field area or the far-field area of ​​the air purifier, because the focus of the control strategy will be different in these two different areas.

[0067] When the target distance is determined to be greater than the preset distance threshold, it indicates that the reference object is far from the air purifier and is in the far-field region. In this case, the impact of the reference object on local air quality is relatively weakened, while the overall air quality within the entire purification area becomes more important. Therefore, the fan speed is no longer adjusted based on the first and second mapping relationships, but instead, it is controlled based on the current environmental pollutant concentration. Pollutant concentration refers to the content of various pollutants in the air detected by the air purifier's built-in sensors, commonly including particulate matter concentration and volatile organic compound concentration. In operation, the air purifier reads the pollutant concentration values ​​fed back by the sensors in real time. When the concentration is high, the fan speed is increased to accelerate the purification process; when the concentration is low, the fan speed is decreased to maintain cleanliness and reduce energy consumption.

[0068] When the target distance is determined to be less than or equal to a preset distance threshold, it indicates that the reference object is in the near-field area of ​​the air purifier and is relatively close. In this case, the relative position and activity status between the reference object and the air purifier have a more direct impact on the air quality in that area. Therefore, the step of controlling the fan speed according to the first and second mapping relationships is executed, that is, adjusting the fan speed according to the aforementioned method, based on the law that the target distance is negatively correlated with the fan speed and the target speed is positively correlated with the fan speed.

[0069] In one example, during long-distance activities, where the distance is greater than 2.5m, if the user's long-distance activity time exceeds 10 minutes, the purifier automatically switches to air quality adjustment mode (adjusting the fan speed according to the concentration of air pollutants).

[0070] If the user manually adjusts the speed, the purifier will operate at the adjusted speed. If the user does not manually adjust the speed again within 10 minutes, it will return to automatic mode.

[0071] This invention, by first determining whether the target distance exceeds a preset distance threshold, allows the air purifier to automatically switch control strategies based on the area where the reference object is located. When the reference object is at a distance, priority is given to ensuring the overall purification effect of the environment; when the reference object enters the near-field area, more targeted response adjustments are made, ensuring that the fan's operating mode matches the actual situation in different scenarios.

[0072] This embodiment provides an air purifier control method, which can be used in the aforementioned air purifier. Figure 2 This is a flowchart of an air purifier control method according to an embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps: Step S201: Obtain the height information of the reference object in the current purification area. For details, please refer to [link to relevant documentation]. Figure 1 Step S101 of the illustrated embodiment will not be described again here.

[0073] Step S202: Based on the height information, determine the target air intake system from the multiple air intake systems of different heights in the air purifier, and turn on the target air intake system.

[0074] Specifically, step S202 includes: Step S2021: Match the height range and height information corresponding to each air intake system, and determine the corresponding target air intake system according to the target height range that the height information falls into. The height range is a range parameter determined vertically according to the setting height of the air intake system on the air purifier.

[0075] Specifically, after obtaining the height information of the reference object in the current purification area, it is necessary to select multiple air intake systems with different heights configured in the air purifier as the target air intake system and activate them, by matching the height information with the height range corresponding to each air intake system.

[0076] Each air intake system on an air purifier corresponds to a specific installation height. This height refers to the vertical installation position of the air intake vent on the unit. Therefore, each air intake system has a defined vertical height range as its corresponding parameter. The height range is usually based on the center height of the air intake vent, extending upwards and downwards by a certain distance. Alternatively, it can be determined based on the actual coverage area of ​​the air intake vent. For example, if the air purifier has an air intake system near the bottom, with a height of 15 centimeters from the ground, considering the area affected by the air intake vent, the corresponding height range for this air intake system can be defined as 0 to 0.4 meters. If the air intake system is located in the middle, with a height of 0.8 meters, the corresponding height range can be defined as 0.4 to 1.2 meters. If the air intake system is located at the top, with a height of 1.5 centimeters, the corresponding height range is defined as above 1.2 meters.

[0077] During the matching process, the height information of the reference object obtained earlier is compared with the pre-set height range of each air intake system to determine which height range the height value falls into. The height information of the reference object here serves to indicate the main activity height or breathing zone height of the reference object. When the height information falls within the range covered by the height range, the air intake system corresponding to that height range is identified as the target air intake system.

[0078] An air purifier control method according to an embodiment of the present invention associates the corresponding height range of each air inlet with its own position. The air purifier uses the pre-defined height range of each air intake system and the height information of the reference object as the matching basis to automatically select the air intake system that is most suitable for the current height of the reference object. This makes the opening position of the air inlet correspond to the actual height of the reference object, so that the purified air is delivered to the vertical area where the reference object is located more specifically.

[0079] In some optional embodiments, the air purifier includes an upper air intake system disposed in the upper half of the main body and a lower air intake system disposed in the lower half of the main body, and step S2022 includes: Step d1: When the height information is greater than the preset height threshold, turn on the upper air intake system and turn off the lower air intake system.

[0080] Step d2: When the height information is less than or equal to the preset height threshold, turn on the lower air intake system and turn off the upper air intake system.

[0081] Step d3: When there are multiple height information that are both greater than the preset height threshold and less than or equal to the preset height threshold, the upper air intake system and the lower air intake system are activated simultaneously.

[0082] In this embodiment of the invention, the upper half of the main body represents the area on the side of the cross-section away from the ground after the main body is evenly divided by a cross-section parallel to the ground when the main body is placed on the ground in a working posture, and the lower half of the main body represents the area on the side of the cross-section close to the ground after the main body is evenly divided by a cross-section parallel to the ground when the main body is placed on the ground in a working posture.

[0083] Specifically, after obtaining the height information of the reference object, the air purifier will compare the height information with the height threshold corresponding to each air intake system. The height threshold refers to the range parameter determined vertically on the air purifier body according to its set height. For example, the height range corresponding to the bottom air intake system is 0-100 cm, and the height range corresponding to the top air intake system is above 100 cm. The preset height threshold is actually the boundary value between the height ranges.

[0084] When the height information is greater than the preset height threshold, the air purifier activates the upper air intake system and deactivates the lower air intake system. When the height information is less than or equal to the preset height threshold, the lower air intake system activates and the upper air intake system deactivates, adapting the height of the purified air delivery to the activity area of ​​shorter individuals.

[0085] In one example, sensor data is acquired, and the height of the moving object is determined by combining data from an infrared thermal imaging sensor and millimeter-wave radar. If the height of the moving object is greater than 1m, the upper air intake system is activated; if the height of the moving object is less than or equal to 1m, the lower air intake system is activated.

[0086] When multiple height information points exist simultaneously, indicating that there are both taller and shorter reference objects in the current purification area, and that these objects belong to different height ranges covered by different air intake systems, the air purifier will simultaneously activate both the upper and lower air intake systems to ensure that the activity areas of people of different heights are covered at the same time.

[0087] The air purifier control method provided in this invention compares the height information of a reference object with a preset height threshold, and controls the opening and closing of the upper and lower air intake systems based on the comparison result. This allows the air purifier to select the appropriate air intake system according to the height of the reference object. When the height information is greater than the preset height threshold, the upper air intake system is activated and the lower air intake system is closed. When the height information is less than or equal to the preset height threshold, the lower air intake system is activated and the upper air intake system is closed. When multiple reference objects with heights greater than or less than or equal to the preset height threshold exist simultaneously, both the upper and lower air intake systems are activated simultaneously. This ensures that the opening and closing states of the air intake systems match the height distribution of the reference objects. In scenarios with a single height, concentrated airflow is used for purification through the air intake system at the corresponding height. In scenarios with multiple heights, simultaneous operation of the upper and lower air intake systems achieves multi-height coverage.

[0088] In one optional implementation, if the height information in multiple consecutive sampling periods is greater than a preset height threshold, it is determined that the height information is greater than the preset height threshold; if the height information in multiple consecutive sampling periods is less than or equal to the preset height threshold, it is determined that the height information is less than or equal to the preset height threshold.

[0089] Specifically, to avoid misjudgments caused by instantaneous detection errors or the brief passage of a reference object, the air purifier uses the detection results from multiple consecutive sampling cycles to make a comprehensive judgment when comparing height information with a preset height threshold. The sampling cycle refers to the time period during which the air purifier collects and records the height information of the reference object at fixed time intervals; for example, it can be set to collect data every two seconds. The preset height threshold is a pre-set boundary value used to divide the height range corresponding to different air intake systems, such as one meter.

[0090] During actual operation, the air purifier continuously acquires the height information of a reference subject over multiple consecutive sampling cycles and records the results of each detection. Only when the height information acquired over multiple consecutive sampling cycles is greater than a preset height threshold is the air purifier finally determined that the reference subject's height is greater than the preset height threshold. For example, assuming the preset height threshold is 1 meter, the air purifier only switches the airflow duct after detecting a stable height within a certain range for three consecutive sampling cycles to avoid false detections caused by people quickly crossing the height threshold. The sampling cycle is two seconds, and the number of consecutive samples is set to three. If the first detection shows a reference subject's height of 1.6 meters, the second 1.68 meters, and the third 1.63 meters, and all three detection results are greater than 1.2 meters, the air purifier determines that the reference subject's height is greater than the preset height threshold and then activates the upper air intake system and deactivates the lower air intake system.

[0091] Accordingly, when the height information obtained in multiple consecutive sampling periods is less than or equal to the preset height threshold, the air purifier finally determines that the height information of the reference object is less than or equal to the preset height threshold. Using the above sampling settings, if the height of the reference object is detected three times in a row as 0.95 meters, 0.98 centimeters and 0.93 centimeters respectively, all less than 1 meter, then the height information is determined to be less than or equal to the preset height threshold, and then the operation of turning on the lower air intake system and turning off the upper air intake system is executed.

[0092] If the detected height information is inconsistent across multiple consecutive sampling periods, for example, the first detection is 1.65 meters, the second is 0.95 meters, and the third is 1.68 meters, and a sequence of values ​​not all greater than or less than the threshold is not formed, the air purifier will not immediately change the on / off state of the air intake system. Instead, it will continue to maintain the original operating mode and continue to accumulate detection data in subsequent sampling periods until the same condition is met for multiple consecutive periods, at which point the corresponding switching operation will be performed.

[0093] By using this method of confirmation based on multiple consecutive sampling cycles, the air purifier can effectively avoid false triggering caused by instantaneous abnormal data or temporary changes in the posture of the reference object, making the switching decision of the air intake system more stable and reliable. The opening and closing combination of the air intake system will only be adjusted when the height of the reference object remains stable within a certain height range.

[0094] As a specific embodiment of the present invention, such as Figure 3 As shown, after system initialization and air purifier startup, the built-in millimeter-wave radar sensor and infrared thermal imaging sensor are automatically activated, entering working mode.

[0095] Activity object perception and identification: Environmental data is collected through millimeter-wave radar and infrared thermal imaging sensors to perceive the height information of active objects within the monitoring range of the air purifier. The object type is determined based on the height threshold: if the height of the active object is >1m, it is identified as an adult; if the height of the active object is ≤1m, it is identified as a child or pet; if objects with a height >1m and objects with a height ≤1m enter the monitoring range at the same time, it is identified as a mixed scene.

[0096] Fan and windshield control: Based on the identified object type, execute the corresponding fan and windshield control strategy: Adult scenario: turn off the lower fan, turn on the upper fan, and activate the upper fan windshield control module to concentrate the purified airflow in the adult activity height area; Child / pet scenario: turn off the upper fan, turn on the lower fan, and activate the lower fan windshield control module to concentrate the purified airflow in the child or pet activity height area; Mixed scenario: turn on the upper and lower fans simultaneously, and control the upper and lower fan windshield modules separately to achieve uniform purification across the entire height range.

[0097] Continuous operation and state switching: The purifier continues to operate according to the above control strategy until the user manually turns off the purifier or manually switches to another level; during operation, the sensor continuously collects data, updates the object type in real time and dynamically adjusts the control strategy.

[0098] As a specific embodiment of the present invention, such as Figure 4 As shown, the air purifier first collects data using a combination of millimeter-wave radar and a laser sensor to determine the position, distance, and speed of a reference object relative to the purifier. The millimeter-wave radar accurately captures the reference object's speed, while the laser sensor acquires the real-time straight-line distance between the reference object and the purifier. Subsequently, the purifier's control module calculates the purification demand index I based on the collected distance and speed information. The calculation formula is I = Wd × f(d) + WV × g(v), where W... d W is the distance weighting coefficient. VLet \(W\) be the speed weight coefficient, \(f(d)\) be a mapping function related to the target distance, which reflects the negative correlation between the target distance and the purification requirement. The closer the target distance is, the larger the value of \(f(d)\); \(g(v)\) is a mapping function related to the target speed, which reflects the positive correlation between the target speed and the purification requirement. The faster the target speed is, the larger the value of \(g(v)\). The weight coefficient and the mapping function can be preset according to the actual usage scenario. The control module compares the calculated purification requirement index \(I\) with a preset threshold, and accordingly adjusts the fan speed: when \(I < 0.3\), the purifier is controlled to operate at the first gear speed, at which time the fan speed is relatively low, suitable for scenarios where the reference object is far away and the activity state is gentle; when \(0.3\leq I < 0.6\), the purifier is controlled to operate at the second gear speed to adapt to medium purification requirements; when \(0.6\leq I < 0.9\), the purifier is controlled to operate at the third gear speed to meet higher purification requirements; when \(I\geq 0.9\), the purifier is controlled to operate at the fourth gear speed, at which time the fan speed is the highest, used for scenarios where the reference object is close and the activity state is active, so as to achieve an accurate match between the purification requirement and the fan speed. For example, if it is preset that \(W\) d = 0.4, \(W\) v = 0.6, when the target distance between the reference object and the purifier is 1.5 meters (corresponding to \(f(d)=0.8\)) and the target speed is 5 meters per minute (corresponding to \(g(v)=0.9\)), then the purification requirement index \(I = 0.4\times0.8 + 0.6\times0.9 = 0.86\), satisfying the condition of \(0.6 < I < 0.9\), and the purifier will automatically switch to operate at the third gear speed.

[0099] In this embodiment, an air purifier control device is also provided. This device is used to implement the above-mentioned embodiments and preferred implementation manners, and those that have been described will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0100] This embodiment provides an air purifier control device, as Figure 5 shown, including: A height information acquisition module 501, configured to acquire the height information of a reference object in the current purification area; A target air inlet system determination module 502, configured to determine a target air inlet system from multiple air inlet systems with different heights of the air purifier according to the height information, and open the target air inlet system.

[0101] The air purifier control device provided in this embodiment of the invention can execute an air purifier control method provided in any embodiment of the invention, and has corresponding functional modules and beneficial effects for executing the method. Further functional descriptions of the various modules and units are the same as in the corresponding embodiments described above, and will not be repeated here.

[0102] This invention also provides an air purifier, such as... Figure 6 As shown, the air purifier can be used to perform an air purifier control method in any of the above embodiments. Figure 6 The diagram shows the structure of the air purifier. As shown in the figure, the air purifier mainly includes a main body 1, an upper air intake system 2, a lower air intake system 3, a sensor array 4, and a control module 5.

[0103] The main body 1 forms the basic framework of the air purifier, supporting and mounting all other components. The main body 1 has an appropriate height in the vertical direction to allow for the installation of air intake systems at different locations, both vertically and horizontally.

[0104] The upper air intake system 2 is located on the upper part of the main body 1. This means that when the main body is placed on the ground in a working posture, the area on the side of the section furthest from the ground after dividing the main body into equal parts parallel to the ground includes an upper fan and an upper filter. The upper air intake system 2 is mainly used to draw in air from a high position of the air purifier, purify it, and then deliver it out through the corresponding air outlet. The upper fan provides the power for airflow in this air intake system, driving air to enter through the upper air inlet; the upper filter is used to filter and purify the incoming air, removing particulate matter, dust, or other pollutants.

[0105] The lower air intake system 3 is located at the lower part of the main body 1. The lower half of the main body represents the area closest to the ground after the main body is evenly divided by a cross-section parallel to the ground when it is placed on the ground in a working posture. It includes a lower fan and a lower filter. The lower air intake system 3 is structurally independent of the upper air intake system 2, and is mainly used to draw in air from the lower part of the air purifier. The lower fan provides independent power support for this air intake system, while the lower filter filters and purifies the drawn-in air. By placing the upper air intake system 2 and the lower air intake system 3 at different positions above and below the main body 1, and equipping each with an independent fan and filter, the air purifier can flexibly select to activate one or both air intake systems simultaneously as needed, to achieve targeted purification of different height areas.

[0106] Sensor array 4 is used to acquire user information from the environment surrounding the air purifier. Sensor array 4 can include various types of sensors, such as cameras for capturing image information, infrared or ultrasonic sensors for measuring distance, and pyroelectric sensors for detecting human activity. Through the coordinated operation of sensor array 4, the air purifier can acquire relevant information about the user in the surrounding environment. This user information includes at least the user's height, the distance between the user and the purifier, and the user's activity speed. Specifically, user height reflects the user's vertical dimensions and can be used to determine the user's breathing zone height; the distance between the user and the purifier reflects the user's proximity to the air purifier; and the user's activity speed reflects the user's movement state, such as whether they are stationary, walking slowly, or running quickly.

[0107] The control module 5 is connected to the sensor array 4, the upper air intake system 2, and the lower air intake system 3, respectively. The control module 5 is responsible for receiving user information collected by the sensor array 4 and executing one of the air purifier control methods described in any of the above embodiments based on this information. Specifically, the control module 5 determines the target air intake system to be activated from the upper air intake system 2 and the lower air intake system 3 based on the acquired user height information, and controls the corresponding system's fan to start and the air valve to open, thus putting the air intake system into operation. In determining the target air intake system, the control module 5 can match the user height with a preset height range. For example, when the user height is greater than a preset height threshold, the upper air intake system 2 is activated and the lower air intake system 3 is closed; when the user height is less than or equal to the preset height threshold, the lower air intake system 3 is activated and the upper air intake system 2 is closed; when multiple users of different heights exist simultaneously, both air intake systems are activated simultaneously. In addition, the control module 5 can also adjust the fan speed in the corresponding air intake system according to the distance between the user and the purifier and the user's activity speed, combined with the preset mapping relationship. For example, it can dynamically adjust the fan speed according to the principle that the closer the distance and the faster the speed, the higher the fan speed, so that the operation mode of the purifier is adapted to the user's actual state.

[0108] With the above structure, the air purifier can automatically select the appropriate height of the air intake system and adjust the corresponding fan speed based on multi-dimensional information such as the user's height, distance, and activity speed in the surrounding environment, so as to achieve targeted purification for users of different heights and different activity states.

[0109] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for controlling an air purifier, characterized in that, The method includes: Obtain the height information of the reference object in the current purification area; Based on the height information, a target air intake system is determined from multiple air intake systems of different heights in the air purifier, and the target air intake system is activated.

2. The method according to claim 1, characterized in that, The method further includes: Obtain the activity status information of the reference object; The fan speed of the air purifier is controlled according to the activity status information.

3. The method according to claim 1, characterized in that, The step of determining the target air intake system from multiple air intake systems of different heights in the air purifier based on the height information includes: The height range corresponding to each air intake system is matched with the height information, and the target air intake system is determined according to the target height range that the height information falls into. The height range is a range parameter determined vertically according to the setting height of the air intake system on the air purifier.

4. The method according to claim 3, characterized in that, The air purifier includes an upper air intake system located in the upper half of the main body and a lower air intake system located in the lower half of the main body. The process of matching the height range corresponding to each air intake system with the height information, and determining the corresponding target air intake system based on the target height range falling within the height information, includes: When the height information is greater than a preset height threshold, the upper air intake system is activated and the lower air intake system is deactivated. When the height information is less than or equal to the preset height threshold, the lower air intake system is activated and the upper air intake system is deactivated. When multiple height information points exist simultaneously, with heights greater than the preset height threshold and heights less than or equal to the preset height threshold, the upper air intake system and the lower air intake system are activated simultaneously.

5. The method according to claim 4, characterized in that, If the height information in multiple consecutive sampling periods is greater than the preset height threshold, it is determined that the height information is greater than the preset height threshold; if the height information in multiple consecutive sampling periods is less than or equal to the preset height threshold, it is determined that the height information is less than or equal to the preset height threshold.

6. The method according to claim 2, characterized in that, The activity status information includes the target distance from the reference object to the air purifier and / or the target speed of the reference object. Controlling the fan speed of the air purifier based on the activity status information includes: The fan speed of the air purifier is controlled according to a first mapping relationship and / or a second mapping relationship. The first mapping relationship indicates that the target distance and the fan speed are negatively correlated, and the second mapping relationship indicates that the target speed and the fan speed are positively correlated.

7. The method according to claim 6, characterized in that, The step of controlling the fan speed of the air purifier according to the first mapping relationship and / or the second mapping relationship includes: A first control value is calculated based on the first mapping relationship and the target distance. The first control value is negatively correlated with the target distance and positively correlated with the fan speed. A second control value is calculated based on the second mapping relationship and the target speed. The second control value is positively correlated with the target speed and also positively correlated with the fan speed. The gear control value is obtained by weighted summation of the first control value and the second control value; The current fan speed is determined based on the matching relationship between the speed control value and the corresponding control value range of each speed.

8. The method according to claim 6, characterized in that, Before controlling the fan speed of the air purifier according to the first mapping relationship and / or the second mapping relationship, the method further includes: Determine whether the target distance is greater than a preset distance threshold; When the target distance is greater than a preset distance threshold, the fan speed is controlled based on the current environmental pollutant concentration. When the target distance is less than or equal to a preset distance threshold, the step of controlling the fan speed of the air purifier according to the first mapping relationship and / or the second mapping relationship is executed.

9. An air purifier control device, characterized in that, The device includes: The height information acquisition module is used to acquire the height information of reference objects in the current purification area; The target air intake system module is used to determine the target air intake system among multiple air intake systems of different heights in the air purifier based on the height information, and to activate the target air intake system.

10. An air purifier, characterized in that, include: main body; The top air intake system is located at the top of the main body and includes an upper fan and an upper filter. The lower air intake system is located at the bottom of the main body and includes a lower fan and a lower filter. The upper part of the main body refers to the area on the side away from the ground after the main body is evenly divided by a cross section parallel to the ground when the main body is placed on the ground in a working posture. The lower part of the main body refers to the area on the side closer to the ground after the main body is evenly divided by a cross section parallel to the ground when the main body is placed on the ground in a working posture. A sensor array is used to acquire user information in the environment surrounding the air purifier, the user information including at least the user's height, the distance between the user and the air purifier, and the user's activity speed; The control module is connected to the sensor array, the upper air intake system, and the lower air intake system respectively, and is used to execute the air purifier control method according to any one of claims 1-8.

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