Range hood and range hood control method

Abstract

Embodiments of the present application provide an extractor hood and an extractor hood control method. The extractor hood comprises a cabinet assembly, a smoke collecting assembly, a first driving device, a distance measuring device, a second driving device and a controller. The smoke collecting assembly is connected to the cabinet assembly in a liftable manner, and the smoke collecting assembly is provided with an air inlet. The first driving device is connected to the smoke collecting assembly and is used to drive the smoke collecting assembly to lift. The distance measuring device is rotatably arranged on the cabinet assembly and faces downward, and is used to detect a distance and generate a distance measuring signal. The second driving device is connected to the distance measuring device and is used to drive the distance measuring device to rotate periodically within a preset angle range in a vertical plane. The controller is connected to the first driving device and the distance measuring device, and is used to determine a minimum vertical distance between the distance measuring device and an object below the distance measuring device according to the distance measuring signal generated by the distance measuring device during a previous preset time period, and control the first driving device to drive the smoke collecting assembly according to the minimum vertical distance. The extractor hood can improve the efficiency of oil fume suction.

Description

Technical Field

[0001] This application relates to the field of kitchen appliances technology, specifically to a range hood and a range hood control method. Background Technology

[0002] Range hoods and cooktops are widely used kitchen appliances. Cooking produces fumes, and using a range hood effectively reduces these fumes. For users, this not only reduces the amount of fumes inhaled, protecting their health, but also keeps the kitchen clean.

[0003] In existing technology, the air intake of range hoods is mostly fixed. In other words, once the range hood is installed, its relative position to the cooktop remains unchanged. A specific smoke extraction zone is formed between the air intake and the cooktop.

[0004] During the use of range hoods, users have diverse cooking methods and use various shapes of cooking utensils. Under these diverse application conditions, existing range hoods lack versatility, making it difficult to maintain effective smoke extraction while ensuring convenient cooking for users, thus impacting the user experience. Summary of the Invention

[0005] To at least partially address the problems existing in the prior art, a range hood is provided according to a first aspect of this application. The range hood includes a casing assembly, a smoke collection assembly, a first drive device, a distance measuring device, a second drive device, and a controller. The smoke collection assembly is vertically and flexibly connected to the casing assembly and has an air intake. The first drive device is connected to the smoke collection assembly and drives it to move up and down. The distance measuring device is rotatably mounted on the casing assembly and faces downwards, and is used to detect distance and generate a distance measurement signal. The second drive device is connected to the distance measuring device and drives it to rotate periodically within a preset angle range in a vertical plane. The controller is connected to the first drive device and the distance measuring device and determines, based on the distance measurement signal generated during the rotation of the distance measuring device in a previous preset time period, the minimum vertical distance between the distance measuring device and an object below it, and controls the first drive device to drive the smoke collection assembly based on the minimum vertical distance.

[0006] According to the above solution, this range hood can achieve real-time lifting and lowering control of the smoke collection component by measuring the distance in real time through the rotation of the ranging device. Furthermore, since the ranging device can acquire distance information from multiple locations below it in real time during rotation, it can accurately detect the state of objects below, thereby enabling precise lifting and lowering control of the smoke collection component. This significantly improves the efficiency of the range hood in removing cooking fumes while ensuring the convenience of the user's cooking operations, thus significantly enhancing the user experience.

[0007] For example, the vertical plane extends in the left-right direction, and the ranging device is positioned directly above the center of the corresponding burner head. The preset angle range includes the angle between the first line and the second line. The first line is a vertical line passing through the center of the ranging device, and the second line is the line connecting the leftmost or rightmost edge point of the burner head to the center of the ranging device. Alternatively, the vertical plane extends in the front-back direction, and the ranging device is positioned directly above the center of the corresponding burner head. The preset angle range includes the angle between the first line and the third line. The third line is the line connecting the frontmost or rearmost edge point of the burner head to the center of the ranging device.

[0008] According to the above scheme, the ranging device can be positioned directly above the corresponding burner head and can rotate in the left-right or front-back direction. During its rotation, the ranging range can include the area corresponding to the left and / or right, front and / or rear half of the burner head. Therefore, the ranging device can rotate within a specific angular range for distance measurement, saving time and improving detection accuracy. It also allows the controller to effectively and accurately determine the minimum vertical distance between the ranging device and objects below it, enabling precise lifting and lowering control of the smoke collection assembly. This, in turn, allows for efficient use of the range hood while facilitating user cooking operations.

[0009] For example, the ranging device includes a left ranging device and a right ranging device, with the left ranging device positioned directly above the center of the left burner head and the right ranging device positioned directly above the center of the right burner head.

[0010] According to the above scheme, the range hood can simultaneously perform rotational distance measurement using two ranging devices positioned on the left and right. This improves detection efficiency, thereby enhancing the controller's real-time control efficiency over the smoke collection components. Furthermore, it allows for flexible control of other components of the range hood based on the different states of the cooking appliances on the two burners, improving the range hood's controllability and user experience.

[0011] For example, the second driving device includes a left driving device and a right driving device. The left driving device is connected to the left ranging device, and the right driving device is connected to the right ranging device. The controller is also connected to the left driving device and the right driving device respectively to control the left driving device and the right driving device to drive the corresponding ranging device.

[0012] According to the above scheme, the left and right ranging devices of the range hood can also be controlled by independent drive devices. This avoids ineffective rotation of the ranging devices, thereby reducing energy consumption and extending the life of the range hood. Furthermore, the controller can coordinate the control of the first and second drive devices, thus uniformly scheduling the smoke collection assembly and all ranging devices. For example, during the process of driving the left ranging device via the left drive device and the right ranging device via the right drive device to complete at least one full rotation within a preset angle range, the minimum vertical distance can be determined based on the ranging signals generated by the two measuring devices, and the first drive device can be used to drive the smoke collection assembly to rise and fall. Therefore, the controller can effectively utilize all the ranging signals measured by the two measuring devices, resulting in simpler control logic and a lower risk of control errors.

[0013] For example, the vertical plane extends in the left-right direction, and the ranging device is set directly above the center of the two burners. The preset angle range includes the angle range between the fourth line and the fifth line. The fourth line is the line connecting the center of the ranging device and the center of the left burner, and the fifth line is the line connecting the center of the ranging device and the center of the right burner.

[0014] According to the above scheme, the minimum vertical distance can be determined by rotating a ranging device left and right within a vertical plane corresponding to the center range of the two furnace heads. This can improve the detection efficiency of the ranging device and reduce the computational load of the controller.

[0015] For example, the controller is also connected to a second drive unit for controlling the second drive unit to drive the ranging device.

[0016] According to the above scheme, the controller can coordinate the control of the first and second drive devices. Therefore, the controller's control logic is simpler and less prone to control errors.

[0017] For example, the air intake is provided with an openable and closable air guide plate, and the controller is also used to control the opening and closing of the air guide plate according to the minimum distance information.

[0018] This range hood can control the opening and closing of its two air guide vanes based on the distance measurement signal from the ranging device. This ensures both the aesthetics of the range hood during off-peak hours and its effective smoke collection and extraction.

[0019] For example, the ranging device is disposed at the bottom of the smoke collection assembly.

[0020] This allows the ranging device to be conveniently hidden from the user's line of sight, improving the overall visual appeal of the range hood. Furthermore, it enables easy and accurate acquisition of distance information from below, avoiding interference from other factors.

[0021] For example, the ranging device is an ultrasonic ranging device.

[0022] Because ultrasonic ranging devices are stable, accurate in measuring distance, and have a small blind zone, the accuracy of the distance information obtained by the controller is guaranteed, which in turn ensures the controller's precise control over the smoke collection components.

[0023] According to another aspect of this application, a range hood control method is also provided, comprising: controlling a range hood ranging device to rotate periodically on the range hood's casing assembly within a preset angle range in a vertical plane; during the rotation of the ranging device, detecting the distance below and generating a ranging signal using the ranging device; determining the minimum vertical distance between the ranging device and an object below the ranging device based on the ranging signal generated during the rotation of the ranging device in a previous preset time period; and controlling the lifting and lowering of the range hood's smoke collection assembly based on the minimum vertical distance.

[0024] According to the aforementioned range hood control method, real-time lifting and lowering control of the smoke collection component can be achieved by using the real-time rotation and distance measurement of the ranging device. Furthermore, since the ranging device can detect the distance to multiple locations below it in real time during rotation, it can accurately detect the state of objects below, thereby enabling precise lifting and lowering control of the smoke collection component. This significantly improves the efficiency of the range hood in removing cooking fumes while ensuring the convenience of the user's cooking operations, thus significantly enhancing the user experience.

[0025] For example, determining the minimum vertical distance between the ranging device and the object below the ranging device based on the ranging signal generated during the rotation of the ranging device in the previous preset time period includes: determining the corresponding vertical distance based on the ranging signal and real-time rotation angle information generated in real time during the rotation of the ranging device in the previous preset time period, according to trigonometric function relationships; and determining the minimum value among all vertical distances determined in the previous preset time period as the minimum vertical distance.

[0026] According to the above scheme, the vertical distance can be determined based on the distance measurement signal and real-time rotation angle information generated in real time during the rotation of the distance measuring device within a previous preset time period. This allows for the determination of the minimum vertical distance between the distance measuring device and the object below it. This scheme is simple, requires little computation, has high accuracy, and low control costs.

[0027] For example, controlling the lifting and lowering of the smoke collection component of a range hood based on a minimum vertical distance includes: at least based on the minimum vertical distance h i minimum vertical distance h i-1 The difference between them controls the raising and lowering of the smoke collection assembly, where the minimum vertical distance h is... i and minimum vertical distance h i-1These distances are determined based on the distance measurement signals generated by the ranging device during the rotation process in the i-th and i-1th preset time periods after the range hood is started, respectively, at the minimum vertical distance h. i Greater than the minimum vertical distance h i-1 At that time, the smoke collection assembly is controlled to descend to the minimum vertical distance h. i Less than the minimum vertical distance h i-1 At that time, control the smoke collection component to rise.

[0028] According to the above scheme, after the range hood is turned on, the ranging device can read the ranging signal detected by the ranging device at preset time intervals, and determine the minimum vertical distance for that time interval. The raising and lowering of the range hood's smoke collection component can be controlled based on at least the difference between the minimum vertical distance of each time interval and the minimum vertical distance of the previous time interval. This scheme is simple, and the obtained minimum vertical distance can accurately represent the maximum height of cooking appliances below the range hood, thereby enabling real-time and precise control of the range hood's smoke collection component.

[0029] For example, at least according to the minimum vertical distance h i minimum vertical distance h i-1 The differences between them control the raising and lowering of the smoke collection assembly, including: determining the minimum vertical distance h. i minimum vertical distance h i-1 The difference; at least based on the difference, determine the time for raising and lowering the smoke collection assembly; based on the determined time, control the raising and lowering of the smoke collection assembly.

[0030] According to the above scheme, the lifting and lowering time of the smoke collection component can be determined by the difference between the minimum vertical distance in the current time period and the minimum vertical distance in the previous time period, thereby achieving lifting and lowering control of the smoke collection component. This control method is simple, accurate, and consumes relatively low computational resources. For example, determining the lifting and lowering time of the smoke collection component, at least based on the difference, includes: determining the lifting and lowering time T of the smoke collection component based on the following formula:

[0031] T = |hi - hi - 1| / v, where v represents the lifting speed of the smoke collection assembly.

[0032] This calculation method is simple, accurate, and requires relatively little computation, which helps to improve the control efficiency of the smoke collection assembly 120.

[0033] For example, at least according to the minimum vertical distance h i minimum vertical distance h i-1 The differences between them, controlling the raising and lowering of the smoke collection assembly, also include: at the minimum vertical distance h i-1 When the distance is greater than or equal to the first preset distance, the distance is based on the minimum vertical distance h. i Control the smoke collection component during time period T iThe internal decreases, where Ti = |hi-h01| / v, h 01 This represents the second preset distance; where, at the minimum vertical distance h i Less than the minimum vertical distance h i-1 At that time, the smoke collection component is controlled to rise, only at the minimum vertical distance h. i-1 Execute when the distance is greater than or equal to the first preset distance.

[0034] The above technical solution allows the smoke collection component to reset, thus avoiding unnecessary operation of the range hood and preventing environmental dust pollution when the smoke collection component is not in operation. After the smoke collection component resets, the above solution allows it to smoothly return to its ideal working state, ensuring the effective operation of the range hood.

[0035] For example, at least according to the minimum vertical distance h i minimum vertical distance h i-1 The difference between them, before controlling the raising and lowering of the smoke collection assembly, the method also includes: based on the minimum vertical distance h i Determine whether the cooking appliance on the burner has been removed; when it is determined that the cooking appliance has been removed, control the smoke collection assembly to reset.

[0036] According to the above scheme, the minimum vertical distance determined by the ranging signal generated during the rotation of the ranging device within a previous preset time period can be used to determine whether the cooking appliance on the burner has been removed. Upon confirming that the appliance has been removed, the smoke collection assembly is controlled to reset. This ensures the effective operation of the range hood while preventing the smoke collection assembly from accumulating dust from the environment, reducing the time and effort required for users to clean the assembly.

[0037] For example, the method further includes: controlling the smoke collection assembly to reset when the range hood is turned off.

[0038] The above solution allows the smoke collection component of the range hood to reset when the range hood is turned off. This solution is simple and easy to implement, and while ensuring the range hood operates in good condition, it prevents the smoke collection component from accumulating dust from the environment, reducing the time and effort required for users to clean the smoke collection component.

[0039] For example, the ranging device includes a left ranging device and a right ranging device. The left ranging device is positioned directly above the left burner, and the right ranging device is positioned directly above the right burner. Based on the ranging signal generated during the rotation of the ranging device within a previous preset time period, the minimum vertical distance between the ranging device and the object below the ranging device is determined. This includes: based on the ranging signal generated during the rotation of the left ranging device within the i-th preset time period after the range hood is started, determining the minimum vertical distance h between the left ranging device and the object below the left ranging device. ilBased on the ranging signal generated during the rotation of the right ranging device in the i-th preset time period, determine the minimum vertical distance h between the right ranging device and the object below the right ranging device. ir Compare the minimum vertical distance h il minimum vertical distance h ir Determine the minimum vertical distance h. il minimum vertical distance h ir The smaller of the two is the minimum vertical distance between the ranging device and the object below the ranging device.

[0040] According to the above scheme, the minimum vertical distance for each preset time period can be determined by comparing the minimum vertical distances determined by the distance measurement signals generated by the two distance measuring devices in each preset time period. This scheme is simple, easy to implement, and can also improve the efficiency of distance measurement signal acquisition, thereby enabling real-time and efficient control of the smoke collection component.

[0041] The invention description introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This description is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0042] The advantages and features of this application are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0043] The following drawings, which are incorporated herein by reference and are used to understand this application, illustrate embodiments of the invention and their descriptions to explain the principles of the invention. In the drawings,

[0044] Figure 1 A schematic diagram of a range hood according to a first embodiment of this application is shown;

[0045] Figure 2 A graph showing the minimum vertical distance determined by a controller according to one embodiment of this application;

[0046] Figure 3a A schematic diagram of a range hood according to a second embodiment of this application is shown;

[0047] Figure 3b A side view of a range hood according to a third embodiment of this application is shown;

[0048] Figure 4 A schematic diagram of a range hood according to a fourth embodiment of this application is shown;

[0049] Figure 5 A schematic flowchart of a range hood control method according to an embodiment of this application is shown;

[0050] Figure 6 A schematic flowchart illustrating the generation of ranging signals by a ranging device according to an embodiment of this application is shown; and

[0051] Figure 7 A signal timing diagram showing the operation of an ultrasonic testing device according to an embodiment of this application is provided.

[0052] The above figures include the following reference numerals:

[0053] 110. Chassis assembly; 120. Smoke collection assembly; 130. First drive unit; 140. Distance measuring device; 150. Second drive unit; 160. Controller; 310. First line; 320. Second line; 330. Third line; 141. Left distance measuring device; 142. Right distance measuring device. Detailed Implementation

[0054] In the following description, numerous details are provided to enable a thorough understanding of this application. However, those skilled in the art will appreciate that the following description merely illustrates preferred embodiments of the application, and that the application can be implemented without one or more of these details. Furthermore, to avoid confusion with this application, some technical features well-known in the art have not been described in detail.

[0055] In practical applications, the closer the range hood's air intake is to the cooking appliance, the better the smoke extraction effect. As mentioned earlier, the air intake in existing range hoods is fixed and cannot be adjusted according to the height of the cooking appliance. If the pot is relatively high, the distance between the air intake and the pot may be too small, causing inconvenience for the user during cooking. If the pot is relatively low, the smoke collection area between the air intake and the pot is large, making it difficult to avoid smoke overflow and affecting the range hood's smoke extraction effect.

[0056] To at least partially solve the above problems, according to a first aspect of the embodiments of this application, a range hood is provided. Figure 1A schematic diagram of a range hood according to a first embodiment of this application is shown. The range hood may include a casing assembly 110, a smoke collection assembly 120, a first drive device 130, a ranging device 140, a second drive device 150, and a controller 160. The casing assembly 110 may include a casing housing and a fan (not shown) and a smoke collection duct (not shown) disposed inside the casing housing. The top of the smoke collection duct may include an air outlet, which may be located at the top of the casing housing. The casing housing may be a cuboid or similar shape. The fan may be any existing or future-developed fan. The fan may be used to generate negative pressure. The fan may be connected to the smoke collection assembly 120 through the smoke collection duct to draw fumes near the smoke collection assembly 120 into the smoke collection duct and discharge them through the air outlet. The number of fans may be one or more. When there are multiple fans, each fan may operate independently and correspond to one smoke collection duct. The smoke collection duct may include a rigid pipe or a flexible pipe (e.g., a corrugated pipe), without specific limitation.

[0057] The smoke collection assembly 120 is vertically and flexibly connected to the chassis assembly 110. The chassis assembly 110 and the smoke collection assembly 120 can be connected via a lifting rail. Exemplarily, and not limitingly, the lifting rail can be disposed inside the chassis assembly 110; for example, the lifting rail can be fixedly disposed on the left and right sides of the rear wall of the chassis assembly 110, and the smoke collection assembly 120 and the chassis assembly 110 can have a generally "drawer-like" structure. The smoke collection assembly 120 can move along the lifting rail between a lowest descending position and a highest rising position under the drive of the first drive device 130. As the smoke collection assembly 120 gradually descends from the first position to the second position, the exposed portion extending beyond the chassis assembly 110 can gradually increase. And when in the highest rising position, all or part of the smoke collection assembly 120 can be located inside the chassis housing.

[0058] The smoke collection assembly 120 may be equipped with air intakes. When the fan is operating, the fumes near the air intakes can be drawn into the air intakes and then discharged through the smoke collection duct. The shape and number of air intakes can be any, without specific limitation. Optionally, there may be two air intakes, each corresponding to a burner head located below it. When there are two air intakes, each air intake can also be connected to a corresponding fan through a smoke collection duct to achieve independent control of the fan and adsorption of nearby fumes. Alternatively, there may be two air intakes and one fan; the fumes drawn in from the two air intakes can be drawn to the fan through a single smoke collection duct and discharged through the exhaust vent. Each air intake may also be equipped with an automatically opening and closing guide plate to achieve independent control of the opening and closing of each air intake.

[0059] The air intake of the smoke collection assembly 120 can be located on the side of its bottom. For example, when the smoke collection assembly 120 is in its highest raised position, the air intake can be retracted into the chassis housing. When the smoke collection assembly 120 is lowered, the air intake can extend beyond the bottom of the chassis housing. Furthermore, the air intake of the smoke collection assembly 120 can be connected to the smoke collection duct during both raising and lowering. Therefore, with this configuration, the height of the air intake can be adjusted by changing the position of the smoke collection assembly 120, allowing the air intake to be positioned more effectively for collecting fumes.

[0060] The first drive device 130 can be connected to the smoke collection assembly 120 and is used to drive the smoke collection assembly 120 to rise and fall. The first drive device 130 can be any suitable drive device, as long as it can drive the smoke collection assembly 120 to rise and fall. For example, the first drive device 130 includes a motor and a connecting rod. The first drive device 130 can be connected to the smoke collection assembly 120 via the connecting rod. The connecting rod can include a hydraulic push rod or a pneumatic push rod, etc.

[0061] The ranging device 140 is rotatably mounted on the chassis assembly 110 and faces downwards, for detecting distance and generating a ranging signal. The ranging device 140 may include any suitable ranging sensor, such as an infrared pyroelectric sensor, an ultrasonic sensor, a radar sensor, etc. The number of ranging devices 140 may be one or more. The ranging device 140 may be located at the front of the chassis assembly 110, for example, on the outer side of the front wall of the chassis housing. The ranging device 140 may also be located at the bottom of the chassis assembly 110. Of course, the ranging device 140 may also be located in other suitable positions. The ranging device 140 faces downwards, for example, with the measuring probe facing downwards, to detect the distance information of the object located below it that is closest to its probe. The ranging device 140 may face directly downwards or diagonally downwards. Exemplarily and not limitingly, when the ranging device 140 is in a reset state, it may face directly downwards. At the moment when the ranging device 140 is dynamically rotating, it may also face diagonally downwards, for example, to the lower left or lower right.

[0062] The second drive device 150 can be connected to the ranging device 140, for example, it can be electrically connected to the ranging device 140. The second drive device 150 can be any type of drive device, as long as it can drive the ranging device 140 to rotate. Exemplarily, and not limitingly, the second drive device 150 may include a motor. The second drive device 150 can be used to drive the ranging device 140 to rotate periodically within a preset angle range in a vertical plane to detect the distance between a point in the vertical plane and the ranging device 140. The vertical plane can be any plane perpendicular to the horizontal plane. For example, the vertical plane can be a front surface extending in a left-right direction. The aforementioned preset angle range can be any suitable angle range. Figure 1 As shown, the preset angle range can be [0, α]. According to an embodiment of this application, α can be an angle less than 180°, such as 60°. Exemplarily and not limitingly, α can be the angle formed by the ranging device 140 and the left and right edges of the burner below it, or it can be other angles greater than this angle. It is easy to understand that by rotating the ranging device 140 within this preset angle range, it can detect the distance information between itself and various positions in the left and right directions of the upper surface of the left burner or the cooking appliance on the left burner. This facilitates accurate detection of the height information of the cooking appliance on the burner, thereby allowing for accurate adjustment of the height of the air intake.

[0063] The controller 160 can be data-connected to both the ranging device 140 and the first drive device 130. On one hand, it can acquire the ranging signal generated by the ranging device 140 during its rotation, and further acquire the ranging signal generated by the ranging device 140 during its rotation within a previous preset time period, thus determining the minimum vertical distance between the ranging device and the object below it. The previous preset time period can be longer than one rotation cycle of the ranging device 140. For example, if the ranging device 140 completes one full rotation within a preset angle range [0, 60°], i.e., the rotation cycle from 0° to 60° takes 1 second, then the previous preset time period could be the previous 1 second or the previous 2 seconds, etc.

[0064] It is easy to understand that the ranging device 140 can detect information about the nearest object along the rotation angle in real time during its rotation. During its rotation, when a cooking appliance is present in its rotation direction, it can detect the distance information from the device to the highest point of the cooking appliance. When the cooking appliance in the stove area is stationary, the distance information detected by the ranging device 140 may differ depending on its orientation during rotation. Similarly, when the stove area includes pots of different heights, the distance information detected by the ranging device 140 may differ depending on its orientation during rotation. For example, when the ranging device 140 rotates towards a shorter wok, it detects the distance between the ranging device 140 and the wok. Conversely, when the ranging device 140 rotates towards a taller steamer, it detects the distance between the ranging device 140 and the steamer. Furthermore, for the same cooking appliance, the ranging device 140 can also effectively detect whether it is covered during rotation. For example, in... Figure 1 When the range hood shown is in operation, when the ranging device 140 rotates towards the edge of the uncovered wok on the left burner, it detects the distance D1 between the ranging device 140 and the edge of the wok. When the ranging device 140 rotates towards the center of the uncovered wok, it detects the distance D2 between the ranging device 140 and the bottom of the wok. When the ranging device 140 rotates towards the edge of a covered wok of the same size on the right burner, it detects the distance D1 between the ranging device 140 and the edge of the wok. When the ranging device 140 rotates towards the center of the covered wok, it detects the distance D3 between the ranging device 140 and the top of the lid handle. This is easily understood as... Figure 1 The distance measuring device 140 shown directly detects the distance D between itself and an object in its orientation direction at the instant of its rotation. After acquiring the distance information representing the distance D, the controller 160 can determine the vertical distance component d of the distance D based on the distance D and the rotation angle θ of the distance measuring device 140 relative to the vertical direction. That is, the controller 160 can determine the vertical distance of the distance measuring device 140 to the object in its orientation direction during rotation. Furthermore, the controller 160 can also determine the minimum vertical distance of the distance measuring device 140 to the object in its orientation direction during rotation in each preset time period, such as within one rotation cycle.

[0065] Figure 2 A graph showing the minimum vertical distance determined by a controller according to an embodiment of this application is presented. As shown, the controller 160 can be viewed as... Figure 1The minimum vertical distance d is determined by the ranging signal generated during the periodic rotation of the ranging device 140 in the vertical plane within a preset angular range such as [0, α]. Within one rotation cycle, the ranging device 140 rotates, for example, from the leftmost side of the left burner aligned with the stove in the illustration to the rightmost side of the right burner aligned with the stove. During this process, the distance D detected by the ranging device 140 can change with time, and consequently, the minimum vertical distance d determined by the controller 160 can also change with time. For example, at time t0, the ranging device 140 is facing the leftmost side of the preset angular range, i.e., the left side of the left burner. At this time, the ranging device 140 can detect its distance D0 from the left surface of the burner, and thus determine its vertical distance d0. As the ranging device 140 gradually rotates to the right, and at time t1 it faces the left edge of the uncovered wok on the left burner, the vertical distance d1 between the ranging device 140 and the edge of the wok can be determined. Then, at time t2, with the ranging device 140 pointing towards the center of the wok, the vertical distance d2 between the ranging device 140 and the bottom of the wok can be determined. At time t3, with the ranging device 140 pointing towards the edge of a wok with a lid of the same size on the right burner, the vertical distance d1 between the ranging device 140 and the edge of the wok can be determined. Next, at time t4, with the ranging device 140 pointing above the center of the wok with the lid, the vertical distance d3 between the ranging device 140 and the top of the lid handle can be determined. Furthermore, the controller 160 can determine the minimum vertical distance between the ranging device 140 and the object below it based on the ranging signal within this cycle. It can be understood that the minimum vertical distance corresponds to the maximum height of the object below. For example, it can be determined that... Figure 2 The minimum vertical distance within one rotation cycle shown in the figure represents the vertical distance d3 between the top of the pot lid handle and the distance measuring device 140. Therefore, based on this minimum vertical distance d3, the first drive device 130 can be controlled to drive the smoke collection assembly 120 to rise and fall.

[0066] After determining the minimum vertical distance based on the ranging signal generated by the ranging device 140 during its rotation within a previous preset time period, the controller 160 can control the smoke collection assembly 120 to rise or fall according to the relationship between the currently determined minimum vertical distance and the previously determined minimum vertical distance. This relationship can represent the state changes of the cooking appliance above the burner, thereby enabling real-time control of the smoke collection assembly 120's rise and fall based on these changes. For example, the rise and fall of the smoke collection assembly 120 can be controlled in real-time based on changes in the state of the cooking appliance, such as moving a pot, changing pots, or the opening and closing of the lid. Exemplarily, and not limitingly, when changing from a higher cooking appliance to a lower one, the controller 160 can control the smoke collection assembly 120 to fall if the currently determined minimum vertical distance is greater than the previously determined minimum vertical distance.

[0067] The controller 160 can control the first drive device 130 in various suitable ways. For example, a high-level signal can control the first drive device 130 to drive the smoke collection assembly 120 to rise, and a low-level signal can control the first drive device 130 to drive the smoke collection assembly 120 to fall. The single-cycle lifting and lowering height of the smoke collection assembly 120 can also be controlled by controlling the single-cycle energization time of the first drive device 130. Of course, the controller 160 can also control the first drive device 130 to drive the smoke collection assembly 120 to rise or fall in other suitable ways.

[0068] It should be noted that the directional terms “up,” “down,” “front,” “back,” “left,” and “right” used in this application are all relative to the user when the range hood is in use.

[0069] It's understandable that fixed-position distance measuring devices struggle to accurately detect the status of cooking utensils under complex cooking conditions. For example, when the pot is uncovered, the distance measuring device might detect the height of the food at the bottom of the pot, rather than the actual height of the pot itself. This is especially true when the pot is tall, while the food at the bottom might be shorter. Adjusting the suction vent height based on the height of the food at the bottom could cause the vent to drop too low, even below the edge of the pot. This not only inconveniences the user when cooking but also severely impacts the range hood's smoke extraction efficiency. The solution described above allows the range hood to control the real-time raising and lowering of the smoke collection component based on the real-time rotation of the distance measuring device. Furthermore, since the measuring device can acquire distance information from multiple locations below it during rotation, it can accurately detect the status of the cooking utensils below, enabling precise control of the smoke collection component's raising and lowering. This significantly improves the range hood's smoke extraction efficiency while maintaining user convenience during cooking, thus significantly enhancing the user experience.

[0070] As mentioned above, the smoke collection assembly 120 may be provided with air intakes, such as a left air intake and a right air intake. Exemplarily, the air intakes may be provided with openable and closable air guides, and the controller 160 is also used to control the opening and closing of the air guides according to the minimum vertical distance.

[0071] According to embodiments of this application, a guide vane may be included above each air intake. The guide vane can be made of any suitable material and can be configured in any suitable shape. The function of the guide vane is to guide the airflow entering the air intake, making the airflow into the smoke collection duct smoother and facilitating the collection of fumes. For example, the guide vane can tilt backward from the lower edge of the air intake in an upward direction. The controller 160 can also control the opening and closing of the left and right guide vanes based on a minimum vertical distance. For example, the controller 160 can control the opening and closing state of the guide vanes, or it can also control the opening and closing angle of the guide vanes. For example, when the cooking appliance on the stove is removed, the minimum vertical distance determined by the controller 160 will reach a certain threshold, thereby controlling the tilt angle of the guide vanes to gradually decrease until they are closed.

[0072] Therefore, this range hood can control the opening and closing of its two air guide plates based on the ranging signal from the ranging device. This ensures both the aesthetics of the range hood during off-peak hours and its effective smoke collection and extraction.

[0073] For example, the aforementioned vertical plane can extend in the left-right direction, and the ranging device 140 can be positioned directly above the center of the corresponding burner head. The preset angle range can include the angle between a first line and a second line, where the first line is a vertical line passing through the center of the ranging device 140, and the second line is the line connecting the leftmost or rightmost edge of the burner head to the center of the ranging device 140. Alternatively, the aforementioned vertical plane can extend in the front-back direction, and the ranging device 140 can be positioned directly above the center of the corresponding burner head. The preset angle range can include the angle between a first line and a third line, where the third line is the line connecting the frontmost or rearmost edge of the burner head to the center of the ranging device.

[0074] Figure 3a A schematic diagram of a range hood according to a second embodiment of this application is shown. Figure 3aAs shown, the vertical plane can be a plane parallel to the wall where the range hood is located. The ranging device 140 can be set directly above the corresponding burner head, such as directly above the center of the left burner head. That is, the horizontal projection of the center of the ranging device 140 can coincide with the horizontal projection of the center of the left burner head. The ranging device 140 can rotate left and right along a preset angle range of the vertical plane. This preset angle range can be an angle that ensures that the ranging device 140 can completely detect the distance to each position of the cooking appliance on the burner head below it during rotation. Since the cooking appliance is usually symmetrical, its height can also be symmetrical about the center of the burner head when it is placed above the burner head. Therefore, as long as the ranging device 140 can detect half of the burner head area during rotation, the minimum vertical distance between the ranging device 140 and the cooking appliance below it can be obtained more accurately. Therefore, the preset angle range can include the angle range between the first line 310 and the second line 320. According to the embodiment of this application, the first line 310 is a vertical line passing through the center point O of the ranging device 140 and perpendicular to the horizontal plane. The second line 320 can be either the line connecting point O to the leftmost edge of the burner head or the line connecting point O to the rightmost edge of the burner head. It is easy to understand that, based on a preset angle range including the angle between the first line 310 and the second line 320, the ranging device 140 can completely detect the distance between the ranging device 140 and at least the upper surface of the left or right half of the cooking appliance below it. Therefore, the controller 160 can accurately determine the vertical distance between the ranging device 140 and the highest point of the cooking appliance below it, i.e., the aforementioned minimum vertical distance. This facilitates the controller 160 in controlling the smoke collection assembly 120 to rise and fall to the desired position.

[0075] Figure 3b A side view of a range hood according to a third embodiment of this application is shown. Figure 3bAs shown, the ranging device 140 can be positioned directly above the corresponding burner head. For example, if positioned directly above the center of the left burner head, the horizontal projection of the center of the ranging device 140 can coincide with the horizontal projection of the center of the left burner head. The vertical plane can also be a side parallel to the depth direction of the range hood, i.e., a plane perpendicular to the wall where the range hood is located. The ranging device 140 can rotate back and forth within a preset angle range along the vertical plane. This preset angle range can include the angle between the first line 310 and the third line 330. The third line 330 can be the line connecting the foremost or rearmost edge of the left burner head to the center O of the ranging device. Similar to the preset angle range including the angle range between the first line 310 and the second line 320, it is easy to understand that, based on the preset angle range including the angle range between the first line 310 and the third line 330, the ranging device 140 can completely detect the distance between the ranging device 140 and the upper surface of at least the front half or the rear half of the cooking appliance below it. Since cooking appliances are typically symmetrical, the minimum vertical distance determined by the controller 160 based on the ranging signal generated by the ranging device 140 during its rotation within this angular range can accurately represent the vertical distance between the ranging device 140 and the highest point of the cooking appliance below it. This allows for precise control of the raising and lowering of the smoke collection assembly 120.

[0076] According to the above scheme, the ranging device can be positioned directly above the corresponding burner head and can rotate in the left-right or front-back direction. During its rotation, the ranging range can include the area corresponding to the left and / or right, front and / or rear half of the burner head. Therefore, the ranging device can rotate within a specific angular range for distance measurement, saving time and improving detection accuracy. It also allows the controller to effectively and accurately determine the minimum vertical distance between the ranging device and objects below it, enabling precise lifting and lowering control of the smoke collection assembly. This, in turn, allows for efficient use of the range hood while facilitating user cooking operations.

[0077] For example, the number of ranging devices 140 can be two. Figure 4A schematic diagram of a range hood according to a fourth embodiment of this application is shown. The range hood's ranging device 140 may include a left ranging device 141 and a right ranging device 142. The left ranging device 141 may be positioned directly above the left burner, and the right ranging device 142 may be positioned directly above the right burner. As mentioned above, the vertical plane may extend in the left-right direction, and the preset angle range may include the angle range between the first line and the second line. The left ranging device 141 can rotate left and right within a ranging range including the left half and / or right half corresponding to the left burner. This facilitates real-time detection of the minimum vertical distance between the cookware above the left burner and the left ranging device 141. Similarly, the right ranging device 142 can rotate left and right within a ranging range including the left half and / or right half corresponding to the right burner, facilitating real-time detection of the minimum vertical distance between the upper surface of the cookware above the right burner and the right ranging device 142. In this way, on the one hand, the vertical distance between the left ranging device 141 and the cooking appliance on the left burner, and the vertical distance between the right ranging device 142 and the cooking appliance on the right burner can be quickly obtained. This allows the controller 160 to quickly obtain the minimum vertical distance, thereby improving the efficiency of the controller 160 in controlling the lifting and lowering of the smoke collection assembly 120. On the other hand, it also allows for different controls based on the different status information of the cooking appliances on the left and right burners. Exemplarily, but not limitingly, the smoke collection assembly 120 may be provided with a left air intake and a right air intake, and the housing assembly 110 includes a left fan connected to the left air intake and a right fan connected to the right air intake. The controller 160 can also independently control the switching on and off of the left and right fans based on the different minimum vertical distances detected by the left ranging device 141 and the right ranging device 142 in the previous preset time period. For example, the left fan can be turned on when the minimum vertical distance detected by the left ranging device 141 is less than a certain threshold. When the minimum vertical distance detected by the right ranging device 142 is greater than the threshold, the right fan is controlled to shut down.

[0078] According to the above scheme, the range hood can simultaneously perform rotational distance measurement using two ranging devices positioned on the left and right. This improves detection efficiency, thereby enhancing the controller's real-time control efficiency over the smoke collection components. Furthermore, it allows for flexible control of other components of the range hood based on the different states of the cooking appliances on the two burners, improving the range hood's controllability and user experience.

[0079] For example, the second drive device 150 includes a left drive device and a right drive device. The left drive device is connected to the left ranging device 141, and the right drive device is connected to the right ranging device 142. The controller 160 is also connected to the left drive device and the right drive device respectively to control the left drive device and the right drive device to drive the corresponding ranging device 140. According to the embodiments of this application, the left ranging device 141 and the right ranging device 142 can also be independently controlled by the two drive devices. For example, both the left drive device and the right drive device include a motor. The left ranging device 141 is electrically connected to the left motor so as to be driven by the left motor; the right ranging device 142 is electrically connected to the right motor so as to be driven by the right motor. Specifically, the controller 160 can be connected to the left drive device and the right drive device respectively, and can also independently control the operation of each drive device. For example, the controller 160 can determine whether there is a cooking appliance on the left burner by obtaining the minimum vertical distance of the left measuring device 141, and can control the left motor to stop running when it is determined that there is no cooking appliance on the left burner, so as to avoid the invalid rotation of the left measuring device 141.

[0080] According to the above scheme, the left and right ranging devices of the range hood can also be controlled by independent drive devices. This avoids ineffective rotation of the ranging devices, thereby reducing energy consumption and extending the life of the range hood. Furthermore, the controller can coordinate the control of the first and second drive devices, thus uniformly scheduling the smoke collection assembly and all ranging devices. For example, during the process of driving the left ranging device via the left drive device and the right ranging device via the right drive device to complete at least one full rotation within a preset angle range, the minimum vertical distance can be determined based on the ranging signals generated by the two measuring devices, and the first drive device can be used to drive the smoke collection assembly to rise and fall. Therefore, the controller can effectively utilize all the ranging signals measured by the two measuring devices, resulting in simpler control logic and a lower risk of control errors.

[0081] It is understood that even if the ranging device 140 includes multiple ranging devices 140 such as the left ranging device 141 and the right ranging device 142, these ranging devices 140 can all be driven by a second drive device 150, enabling them to rotate synchronously in the same direction or in opposite directions, thereby traversing their rotation range. In this case, the controller may or may not be connected to the second drive device. For example, the second drive device can autonomously drive the ranging devices 140 to rotate.

[0082] In this technical solution, the cost of the range hood is relatively low.

[0083] For example, the aforementioned vertical plane can extend in the left-right direction, and the ranging device is positioned directly above the center of the two burners. The preset angle range includes the angle between the fourth line and the fifth line, where the fourth line is the line connecting the center of the ranging device to the center of the left burner, and the fifth line is the line connecting the center of the ranging device to the center of the right burner.

[0084] As previously mentioned, the vertical plane can extend in the left-right direction. The height of cooking appliances above the two burners can also be detected by rotating a ranging device left and right within the vertical plane. This ranging device can be positioned, for example, directly above the midpoint between the left and right burners. Since cooking appliances are typically symmetrical, the height information of half of the cooking appliance on each burner can be detected by a ranging device 140. Accordingly, the rotation ranging range of the ranging device 140 can correspond to the central area of ​​the two burners, which can include the right half of the left burner and the left half of the right burner. The preset angle range of the ranging device 140 can include the angle range between the fourth and fifth lines. The fourth and fifth lines represent the lines connecting the ranging device to the centers of the two burners, respectively. Therefore, during the left and right rotation of the ranging device 140, the distance between the top of the right half of the cooking appliance on the left burner and the ranging device 140, and the distance between the top of the left half of the cooking appliance on the right burner and the ranging device 140, can be detected. This improves the detection efficiency of the ranging device and reduces the computational load on the controller 160. The controller 160 can determine the minimum vertical distance, i.e., the distance between the highest point of the cooking appliances on the two burners and the ranging device 140, based on the ranging signal generated by the ranging device 140 within, for example, at least one rotation cycle, thereby controlling the raising and lowering of the smoke collection assembly 120.

[0085] According to the above scheme, the minimum vertical distance can be determined by rotating a ranging device left and right within a vertical plane corresponding to the center range of the two furnace heads. This can improve the detection efficiency of the ranging device and reduce the computational load of the controller.

[0086] As previously described, the controller 160 can also be connected to the second drive unit 150 for controlling the second drive unit 150 to drive the distance measuring device 140. Exemplarily, and not limitingly, the second drive unit 150 may include a motor. The controller 160 can also be electrically connected to the motor, and can further control the distance measuring device 140 by controlling the motor. Optionally, the controller 160 can control the power supply to the second drive unit 150. For example, in the example described above where the second drive unit 150 includes a left drive unit and a right drive unit, the controller 160 can also control the power supply to the left drive unit corresponding to the burner head to be turned off when the cooking appliance on the burner head is removed, such as when the cooking appliance on the left burner head is removed. This avoids invalid rotation of the distance measuring device 140. In another example, the controller 160 can also control and adjust the operating speed of the second drive unit 150. For example, after the range hood is turned on, the second drive unit 150 can be controlled to operate at a higher operating speed so that the distance measuring device 140 rotates at a faster speed to quickly obtain the minimum vertical distance. After the ranging signal stabilizes, for example after several rotation cycles, the operating speed of the second drive device 150 can be reduced by outputting a low level.

[0087] According to the above scheme, the controller can coordinate the control of the first drive device 130 and the second drive device. Therefore, the controller's control logic is simpler and less prone to control errors.

[0088] Alternatively, the controller and the second drive unit may not be connected. For example, the second drive unit could be an electric actuator. As long as the range hood is started, the second drive unit can be powered on, and it can continuously drive the ranging device to rotate periodically along the vertical plane.

[0089] In this technical solution, the driving scheme of the ranging device is simple and easy to implement.

[0090] For example, the ranging device 140 can be located at the bottom of the smoke collection assembly 120. This allows the ranging device to be hidden from the user's line of sight, improving the overall visual appeal of the range hood. Furthermore, it facilitates accurate acquisition of distance information from below, avoiding interference from other factors.

[0091] Exemplarily, the ranging device 140 is an ultrasonic ranging device 140. The ultrasonic ranging device 140 can generate ultrasonic waves. Since the speed of ultrasonic waves in air is known, the actual distance from the ultrasonic ranging device to the object in front can be calculated based on the difference between the time the ultrasonic wave is emitted and the time it takes for it to be reflected back from an obstacle and received. In embodiments of this application, the object in front is a cooking appliance or the burner of a stove.

[0092] Because ultrasonic ranging devices are stable, accurate in measuring distance, and have a small blind zone, the accuracy of the distance information obtained by the controller is guaranteed, which in turn ensures the controller's precise control over the smoke collection components.

[0093] According to another aspect of this application, a method for controlling a range hood is provided. Figure 5 A schematic flowchart of a range hood control method according to an embodiment of this application is shown. Figure 5 As shown, the range hood control method 500 includes the following steps:

[0094] In step S520, the range measuring device 140 of the range hood is controlled to rotate periodically on the range hood housing assembly 110 within a preset angle range in the vertical plane.

[0095] In step S540, during the rotation of the ranging device 140, the ranging device 140 detects the downward distance and generates a ranging signal. As mentioned earlier, the ranging device 140 can be oriented directly downward in the reset state, thereby detecting the distance between itself and the nearest object directly below it; the ranging device can also be oriented diagonally downward momentarily during rotation, thereby detecting the distance between itself and the nearest object diagonally downward. For simplicity, the distance detected by the ranging device to the nearest object in its oriented direction is collectively referred to as the downward distance. Since the ranging device 140 detects the downward distance during its rotation, it can measure the distance between itself and objects at multiple locations below the chassis assembly 110.

[0096] It is understood that the ranging device 140 can be any existing or future-developed ranging device suitable for detecting distances less than 1 meter, such as an ultrasonic ranging device 140. Exemplarily, the ranging device 140 can detect the distance below and generate a ranging signal through the following steps S541 to S544.

[0097] In step S541, the controller 160 receives a trigger signal of the first frequency.

[0098] The controller 160 can send a trigger signal of a first frequency to the ranging device 140. The first frequency can be any value between 100 and 200 Hz, a frequency range that can reduce the computational load on the controller 160 while ensuring the control accuracy of the smoke machine. Taking 100 Hz as an example, the ranging device 140 receives a trigger signal from the controller 160 every 10 milliseconds. The trigger signal can be a square wave signal with a pulse width of, for example, 10 microseconds or more.

[0099] Figure 6 A schematic flowchart illustrating the generation of a ranging signal by a ranging device 140 according to an embodiment of this application is shown. Figure 6The left side shows a schematic flowchart of a timing subroutine that can run continuously. When the controller 160 starts working, it can initialize the flag bit flag = 0. In the timing subroutine, the timing flag bit flag_10ms is first initialized to 0, and a loop timing operation begins. When the loop timing operation has counted 10 milliseconds, flag_10ms is set to 1. When flag_10ms = 1, the controller 160 determines the distance measured by the ranging device 140 based on the ranging signal, see [link to relevant documentation]. Figure 6 As shown in the flowchart on the right; flag_10ms is set to 0 again, and a trigger signal, such as a 10-microsecond high level, is sent to the ranging device 140 while flag = 0, and flag is set to 1 at the same time. Thus, the ranging device 140 will receive a trigger signal of, for example, 100 Hz.

[0100] Step S542: Send a detection signal upon triggering the trigger signal.

[0101] When the ranging device 140 receives a trigger signal, it can generate and send a detection signal under the trigger of the trigger signal. The following explanation takes an ultrasonic ranging device 140 as an example. Figure 7 A signal timing diagram illustrating the operation of the ultrasonic ranging device 140 according to an embodiment of this application is shown. Figure 7 As shown, when the ultrasonic ranging device 140 receives a high-level pulse signal (i.e., trigger signal) with a pulse width of 10 microseconds, the ultrasonic detection device can generate a periodic level signal with a frequency of 40 kHz consisting of 8 high-level pulses and transmit it. This periodic level signal is the detection signal.

[0102] Step S543: Receive the echo signal generated when the detection signal encounters an object within the effective range.

[0103] After the detection signal is emitted, once it encounters an object within the effective range of the ultrasonic ranging device 140, it can immediately generate an echo signal and reflect it back to the ultrasonic ranging device 140. The effective range can be reasonably set according to the user's needs, for example, it can be a value of 1 meter.

[0104] Step S544: A ranging signal is generated based on the detection signal and the echo signal. The pulse width of the ranging signal is proportional to the distance between the object and the ranging device 140. In this example, the detection signal and the echo signal can represent the ultrasonic wave emitted by the ultrasonic ranging device 140 as described above and the ultrasonic wave reflected back after encountering an obstacle, respectively. The ultrasonic ranging device 140 can generate a ranging signal based on the detection signal and the echo signal. The pulse width of the ranging signal can represent the time difference between the ultrasonic wave emitted and received by the ultrasonic ranging device 140. It can be understood that a wider pulse width results in a larger time difference, indicating a longer time required for the ultrasonic wave to reflect back, i.e., a greater distance between the object and the ranging device 140. The measured distance can be calculated based on the pulse width.

[0105] Therefore, the distance between the measured object and the ranging device depends only on the detection signal and the echo signal, and is not affected by factors such as ambient brightness or lighting. This ensures the accuracy of the measured distance, resulting in more stable control of the stove's firepower and smaller errors.

[0106] Step S560: Determine the minimum vertical distance between the ranging device 140 and the object below it based on the ranging signal generated during the rotation of the ranging device 140 in the previous preset time period. The ranging signal includes distance information.

[0107] For example, this step can be implemented by controller 160. Controller 160 can determine the distance information included in the ranging signal based on the ranging signal.

[0108] For example, the controller 160 may perform the following operations to determine the distance information included in the ranging signal.

[0109] When a high level of the ranging signal is first detected, the counter is started. The counter increments at a second frequency, that is, the count increases by 1 at fixed time intervals. When a low level of the ranging signal is detected for the first time after a high level is detected, the counter is stopped. The distance is calculated based on the counter count. For ease of understanding, please refer to [link to previous text]. Figure 6 Explain it. Figure 6The right side shows a schematic flowchart of an external interrupt subroutine according to an embodiment of this application. This external interrupt subroutine is used by the controller 160 to determine the distance based on the ranging signal. A timing subroutine can start the external interrupt subroutine at a fixed frequency, for example, every 10 milliseconds. As mentioned earlier, every 10 milliseconds, when flag = 0, flag can be set to 1, thereby starting the external interrupt subroutine to begin determining the distance based on the ranging signal. It can be understood that the duration of the high level of the ranging signal represents the distance between the ranging signal and the object in front; the rising edge is the start of the high level, and the falling edge is the end of the high level. In this embodiment, the distance between the ranging device 140 and the object in front is determined by a counter operation. The counting operation refers to counting the time the ranging signal received by the controller 160 remains high at a second frequency. Figure 6 As shown in the external interrupt subroutine, after the external interrupt subroutine starts, it first checks the current flag value. If flag = 1 and a high level of the ranging signal is detected for the first time, the counter is started. The first detection of a high level of the ranging signal means that the ranging signal has a rising edge at the current moment. At this time, the count n of the counter is set to 1 and flag is set to 2. Then, the process returns to the beginning step of the external interrupt subroutine to check the current flag value again. This time, flag = 2, and it checks whether a high level of the ranging signal is detected. If the ranging signal is still high, the current flag value is checked again. This loop repeats until a low level of the ranging signal is detected, which is the first low level detected after a high level was detected, and the ranging signal has a falling edge at the current moment. At this point, the high level of the ranging signal ends. The counter can be terminated, and flag can be reset to 0 to prepare for the next start of the external interrupt subroutine. Since the counting operation is performed at a fixed second frequency, the duration of the high level can be determined based on the count n. At this point, the external interrupt subroutine execution ends and exits.

[0110] The duration of the high-level signal in the ranging signal can be calculated using a simple logic circuit called a counter. The counter is not only simple in structure and low in cost, but also provides relatively accurate counts, ensuring the accuracy of the obtained distance.

[0111] For example, the distance can be calculated using the formula d = (n-1)*340 / 2f. Here, d represents the distance, n represents the count, f represents the second frequency, and 340 m / s is the speed of sound in air. The second frequency is, for example, 8000 Hz. As mentioned earlier, the counter is started when the rising edge of the ranging signal is detected. Therefore, the difference between the count and 1, divided by the second frequency f, represents the duration of the high level. Multiplying the time by the speed yields the round-trip distance of the signal. Therefore, dividing the previously obtained distance by 2 gives the final distance d.

[0112] The method described above for determining distance information from the ranging signal involves minimal computation and yields accurate results. This effectively ensures precise control of the range hood.

[0113] Step S580 involves controlling the raising and lowering of the smoke collection component of the range hood based on the minimum vertical distance. This step can be implemented by the controller 160, which can control the raising and lowering of the smoke collection component 120 in real time according to the minimum vertical distance. For example, the raising and lowering of the smoke collection component 120 can be controlled by controlling the energizing time of the drive motor. Those skilled in the art can understand the specific steps and technical effects of the above-described range hood control method by reading the detailed description of the range hood above, and will not be repeated here for the sake of brevity.

[0114] For example, step S560, determining the minimum vertical distance between the ranging device 140 and the object below the ranging device 140 based on the ranging signal generated during the rotation of the ranging device 140 in the previous preset time period, includes steps S561 and S562.

[0115] In step S561, the corresponding vertical distance can be determined based on the ranging signal and real-time rotation angle information generated in real time during the rotation of the ranging device 140 within the previous preset time period, according to trigonometric relationships. Exemplarily, and not limitingly, the real-time rotation angle information of the ranging device 140 may include, for example... Figure 1 The distance measuring device 140 is shown with respect to the real-time rotation angle θ relative to the vertical direction. It is easy to understand that, based on the distance measuring signal generated in real-time during the rotation of the distance measuring device 140 within a previous preset time period, the distance D detected by the distance measuring device 140 in real-time during that period can be directly determined. When the real-time rotation angle θ is 0, this distance D can be the vertical distance. When the real-time rotation angle θ is not 0, this distance D can be the oblique distance. As mentioned earlier, after determining the distance D, the vertical distance component d of the distance D can be determined based on the distance D and the real-time rotation angle θ of the distance measuring device 140 relative to the vertical direction. This vertical distance component d is the vertical distance. According to the principle of trigonometric functions, the vertical distance d can be equal to the product of the distance D and the cosine of the real-time rotation angle θ of the distance measuring device 140 relative to the vertical direction. That is: d = D × cosθ. Of course, the real-time rotation angle information can also be other information that can represent the rotation angle of the distance measuring device 140. The vertical distance can also be determined through other calculation methods.

[0116] In step S562, the minimum value among all vertical distances determined within the previous preset time period is identified as the minimum vertical distance. (Refer to again...) Figure 2The preset time can be the time period from t0 to t4 shown in the figure. The minimum vertical distance can be determined from the minimum vertical distance among multiple vertical distances determined within this time period. For example, the vertical distance d3 between the top of the pot lid handle and the measuring device 140 detected by the measuring device 140 at time t4 can be determined as the minimum vertical distance for this time period, and the smoke collection assembly 120 can be controlled to rise and fall to the desired position based on this minimum vertical distance.

[0117] According to the above scheme, the vertical distance can be determined based on the distance measurement signal and real-time rotation angle information generated in real time during the rotation of the distance measuring device within a previous preset time period. This allows for the determination of the minimum vertical distance between the distance measuring device and the object below it. This scheme is simple, requires little computation, has high accuracy, and low control costs.

[0118] For example, step S580, which controls the lifting and lowering of the smoke collection component of the range hood based on the minimum vertical distance, includes step S581.

[0119] In step S581, at least according to the minimum vertical distance h i minimum vertical distance h i-1 The difference between them controls the raising and lowering of the smoke collection assembly. Among them, the minimum vertical distance h... i and minimum vertical distance h i-1 These distances are determined based on the ranging signals generated by the ranging device during the rotation process within the i-th and i-1th preset time periods after the range hood is started. Furthermore, the minimum vertical distance h... i Greater than the minimum vertical distance h i-1 At that time, the smoke collection assembly is controlled to descend to the minimum vertical distance h. i Less than the minimum vertical distance h i-1 At that time, the smoke collection assembly is controlled to rise. The minimum vertical distance h can be determined based on the ranging signal generated by the ranging device 140 during its rotation within the i-th preset time period after the range hood is started. i i is a positive integer. It's easy to understand that the i-th preset time period can represent the previous preset time period. As stated above, the duration of the previous preset time period can be greater than or equal to the time encompassed by one cycle of rotation of the ranging device 140 within a preset angle range in the vertical plane. One cycle can be the time taken for the ranging device 140 to rotate from the smallest angle to the largest angle within the preset angle range. For example, one cycle is 1 second, and the previous preset time period is, for example, 1 second. For example, if the current time is the 5th second after the range hood starts, then i can be equal to 5. We can first acquire all the ranging signals generated during the rotation of the ranging device 140 within the 5th second after the range hood starts, and then filter out the minimum vertical distance h5 included in these signals.

[0120] It is easy to understand that the minimum vertical distance can be the vertical distance between the measuring device 140 and the highest point of the cooking utensil, as detected by the measuring device 140.

[0121] For simplicity, the preset time period will be referred to as the time period, for example, h. i It can represent the current time period, h i-1 This can represent the previous time period. The raising and lowering of the smoke collection component 120 can be controlled based on the difference between the minimum vertical distance in the current time period and the minimum vertical distance detected in the previous time period. For example, if the preset time period is 1 second, and the current time period is the 5th second after the range hood starts, the difference between the minimum vertical distance h5 and the minimum vertical distance h4 can be determined. Then, the raising and lowering of the smoke collection component 120 can be controlled based on this difference. For example, generally, if the difference is positive, the smoke collection component 120 can be controlled to descend. If the difference is negative, the smoke collection component 120 can be controlled to rise. Alternatively, the difference can be compared with a preset difference threshold. Exemplarily and not limitingly, the difference threshold can include a first difference threshold and a second difference threshold, where the first difference threshold can be positive and the second difference threshold can be negative. The smoke collection component 120 can be controlled to descend only if the difference is greater than the first difference threshold, and the smoke collection component 120 can be controlled to rise only if the difference is less than the second difference threshold.

[0122] In the above scheme, i can also be equal to 1. In this case, for example, the minimum vertical distance of the 0th preset time period can be the minimum vertical distance determined by the controller 160 during the rotation process of the ranging device 140 in the last preset time period after the last start of the range hood.

[0123] According to the above scheme, after the range hood is turned on, the ranging device can read the ranging signal detected by the ranging device at preset time intervals, and determine the minimum vertical distance for that time interval. The raising and lowering of the range hood's smoke collection component can be controlled based on at least the difference between the minimum vertical distance of each time interval and the minimum vertical distance of the previous time interval. This scheme is simple, and the obtained minimum vertical distance can accurately represent the maximum height of cooking appliances below the range hood, thereby enabling real-time and precise control of the range hood's smoke collection component.

[0124] For example, in step S581, at least based on the minimum vertical distance h i minimum vertical distance h i-1 The difference between them controls the raising and lowering of the smoke collection assembly 120, including steps S581.1, S581.2 and S581.3.

[0125] In step S581.1, the minimum vertical distance h can be determined. i minimum vertical distance h i-1The difference. For example, if the preset time period is 1 second, and the current time period is the 10th second since the range hood started, the minimum vertical distance h of the range hood's rotation during the 10th second can be obtained. 10 The minimum vertical distance h9 at the 9th second can be used to obtain the difference h between the two. 10 -h9.

[0126] In step S581.2, the lifting and lowering time of the smoke collection assembly 120 can be determined at least based on the difference. It is easy to understand that the difference can be 0 or not. Whether the difference is 0 or not, it can be determined whether the state of the cooking appliance on the stovetop below the ranging device 140 has changed. When the difference is not 0, the state of the cooking appliance on the stovetop below the ranging device 140 has changed. Alternatively, considering detection error, it can be determined that the state of the cooking appliance on the stovetop below the ranging device 140 has changed when the absolute value of the difference reaches a first absolute value threshold. This first absolute value threshold can be a value close to 0, such as 0.5. When the difference is not 0 or the absolute value of the difference is greater than the first absolute value threshold, the expected lifting and lowering height of the smoke collection assembly 120 can be further determined based on the difference. Since the difference can accurately reflect the change in the highest point of the cooking appliance on the stovetop, the expected lifting and lowering height of the smoke collection assembly 120 can be determined based on the difference. The difference can be directly used as the expected lifting and lowering height, or the difference can be converted according to a preset conversion rule to obtain the expected lifting and lowering height. Meanwhile, the smoke collection assembly 120 can maintain a fixed speed of rising or falling, and the range hood can reach the expected lifting height by controlling the lifting time of the smoke collection assembly 120. The lifting time can be calculated based on the obtained expected lifting height and the fixed lifting speed of the smoke collection assembly 120. It is easy to understand that this lifting time can be the single lifting time of the smoke collection assembly 120 in the current time period.

[0127] In step S581.3, the smoke collection assembly 120 is controlled to rise and fall based on the determined time. After determining the rising and falling time of the smoke collection assembly 120 in the current time period, the rising and falling of the smoke collection assembly 120 can also be controlled by controlling the drive device of the smoke collection assembly 120. For example, the rising and falling of the smoke collection assembly 120 can be controlled by controlling the energizing time of its drive device, which can be equal to the determined rising and falling time. Various implementations of this solution are readily understood by those skilled in the art and will not be elaborated upon here.

[0128] According to the above scheme, the raising and lowering time of the smoke collection component can be determined by the difference between the minimum vertical distance in the current time period and the minimum vertical distance in the previous time period, thereby achieving the raising and lowering control of the smoke collection component. This control method is simple, accurate, and requires relatively low computational resources.

[0129] For example, step S581.2, determining the lifting and lowering time of the smoke collection assembly 120 based at least on the difference, includes: determining the lifting and lowering time T of the smoke collection assembly 120 based on the following formula:

[0130] T = |h i -h i-1 The formula | / v, where v represents the lifting speed of the smoke collection component 120, which is a known quantity. The lifting speed v of the smoke collection component 120 is, for example, 16 mm / s. During the operation of the range hood, based on the minimum vertical distance determined in real time for each time interval according to the distance measurement signal generated by the distance measuring device 140, this minimum vertical distance can be substituted into the above formula to quickly obtain the lifting time of the smoke collection component. Therefore, real-time lifting control of the smoke collection component of the range hood can be achieved.

[0131] This calculation method is simple, accurate, and requires relatively little computation, which helps to improve the control efficiency of the smoke collection assembly 120.

[0132] For example, in step S581, at least according to the minimum vertical distance h i minimum vertical distance h i-1 The differences between them, controlling the lifting and lowering of the smoke collection assembly 120, also include: at the minimum vertical distance h i-1 When the distance is greater than or equal to the first preset distance, the distance is based on the minimum vertical distance h. i Control the smoke collection assembly 120 during time period T i Internal decrease, of which T i =|h i -h 01 ] / V,h 01 This indicates the second preset distance. Specifically, the smoke collection assembly 120 is raised only at the minimum vertical distance h. i-1 The operation is performed when the distance is greater than or equal to a first preset distance. The first preset distance can be equal to the distance between the ranging device 140 and the highest point of the stove head. The second preset distance can be the desired distance between the smoke collection assembly 120 and the highest point of the cooking appliance, which can be set as needed, for example, 10 centimeters. v represents the lifting speed of the smoke collection assembly 120.

[0133] It is understandable that in some cases, the smoke collection assembly 120 of the range hood may reset for various reasons, i.e., return to its highest raised position. For example, when the range hood is turned off, the smoke collection assembly 120 may return into the housing assembly 110, at which point the range hood cannot perform smoke extraction. Ideally, in the case of the smoke collection assembly 120 resetting, the minimum vertical distance is a first preset distance. Considering the measurement error of the ranging device 140, the minimum vertical distance may also be slightly greater than the first preset distance. Based on this, if the currently detected minimum vertical distance h... i Relative to the first preset distance (i.e., the minimum vertical distance h)i-1 The distance has been reduced; for example, if a user places a cooking appliance on the stovetop, the distance can be based on the minimum vertical distance h. i Control the smoke collection assembly 120 during time period T i The smoke collection assembly 120 descends to a distance h from the cooking appliance. 01 The location.

[0134] The above technical solution allows the smoke collection component to reset, thus avoiding unnecessary operation of the range hood and preventing environmental dust pollution when the smoke collection component is not in operation. After the smoke collection component resets, the above solution allows it to smoothly return to its ideal working state, ensuring the effective operation of the range hood.

[0135] For example, in step S581, at least according to the minimum vertical distance h i minimum vertical distance h i-1 Before controlling the raising and lowering of the smoke collection assembly 120, the method further includes steps S580.1 and S580.2.

[0136] In step S580.1, the minimum vertical distance h can be used as a basis. i This determines whether cooking appliances on the stovetop have been moved. For example, the minimum vertical distance h acquired in real time for each time period can be used. i This is compared to the aforementioned first preset distance. As mentioned earlier, the first preset distance can be equal to the distance between the ranging device 140 and the top of the burner head. For example, the distance between the ranging device 140 and the top of the burner head is, for instance, 75 centimeters. The minimum vertical distance h at the current time period can be obtained in real time. i If the distance is less than 75 cm, it confirms that the cooking appliance on the stovetop has not been moved. The minimum vertical distance h for the current time period can be obtained in real-time. i If the distance is equal to or greater than 75 cm, it is determined that the cooking appliance on the burner head has been removed. Then, in step S580.2, upon determining that the cooking appliance above the burner head has been removed, the smoke collection assembly 120 can be controlled to reset. Here, the smoke collection assembly 120 can be controlled to return to its original position, for example, it can be controlled to return to its highest raised position, such as being completely concealed inside the casing. Furthermore, if the minimum vertical distance indicates the presence of a cooking appliance on the burner head during the next preset time period, the smoke collection assembly 120 can be controlled to lower again.

[0137] According to the above scheme, the minimum vertical distance determined by the ranging signal generated during the rotation of the ranging device within a previous preset time period can be used to determine whether the cooking appliance on the burner has been removed. Upon confirming that the appliance has been removed, the smoke collection assembly is controlled to reset. This ensures the effective operation of the range hood while preventing the smoke collection assembly from accumulating dust from the environment, reducing the time and effort required for users to clean the assembly.

[0138] For example, the method 500 further includes step S590, controlling the smoke collection assembly 120 to reset when the range hood is turned off. Alternatively, the smoke collection assembly 120 can be controlled to return to its initial position when the range hood is detected to be turned off. For example, the smoke collection assembly 120 can be controlled to rise to its highest raised position, for example, it can be completely or partially retracted into the casing.

[0139] The above solution allows the range hood's smoke collection component to reset when the range hood is turned off. This solution is simple and easy to implement, and while ensuring the range hood's optimal working condition, it prevents the smoke collection component from accumulating environmental dust, reducing the time and effort users need to spend cleaning it.

[0140] For example, the ranging device 140 includes a left ranging device 141 and a right ranging device 142, with the left ranging device 141 positioned directly above the left burner head and the right ranging device 142 positioned directly above the right burner head. The implementation of this scheme is as described above and will not be repeated here for the sake of simplicity.

[0141] Step S560, based on the ranging signal generated by the ranging device 140 during its rotation within the previous preset time period, determines the minimum vertical distance between the ranging device 140 and the object below it. This may include steps S560.3, S560.4, and S560.5. In these three steps, the ranging signals generated by the two ranging devices 140 can be combined to determine the minimum vertical distance h for each preset time period in real time. i .

[0142] In step S560.3, the ranging signal generated by the left ranging device 141 during the rotation process within the i-th preset time period after the range hood is started can be acquired in real time, and the minimum vertical distance h between the left ranging device 141 and the object below the left ranging device 141 can be determined accordingly. il In step S560.4, the ranging signal generated by the right ranging device 142 during the rotation process within the i-th preset time period after the range hood is started can be acquired in real time, and the minimum vertical distance h can be determined accordingly. ir Then, in step S560.5, the minimum vertical distance h can be determined based on the comparison results. i For example, in h il >h ir In this case, h can be ir The minimum vertical distance h for this time period is determined. i And in h il <h ir In this case, h can be il The minimum vertical distance for that time period is determined.

[0143] According to the above scheme, the minimum vertical distance for each preset time period can be determined by comparing the minimum vertical distances determined by the distance measurement signals generated by the two distance measuring devices in each preset time period. This scheme is simple, easy to implement, and can also improve the efficiency of distance measurement signal acquisition, thereby enabling real-time and efficient control of the smoke collection component.

[0144] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of this application. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of this application. All such changes and modifications are intended to be included within the scope of this application as claimed in the appended claims.

[0145] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0146] Similarly, it should be understood that, in order to streamline this application and aid in understanding one or more of the various inventive aspects, features of this application may sometimes be grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of this application. However, this approach should not be construed as reflecting an intention that the claimed application requires more features than are expressly recited in each claim. Rather, as reflected in the corresponding claims, its inventive point lies in solving the corresponding technical problem with features fewer than all features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this application.

[0147] Those skilled in the art will understand that, apart from the mutual exclusion of features, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or apparatus so disclosed can be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0148] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0149] It should be noted that the above embodiments are illustrative of this application and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0150] The above description is merely a specific embodiment or illustration of the embodiments of this application. The scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A range hood, characterized in that, It includes a chassis assembly, a smoke collection assembly, a first drive unit, a ranging device, a second drive unit, and a controller, wherein, The smoke collection assembly is vertically and vertically connected to the chassis assembly, and the smoke collection assembly is provided with an air intake. The first driving device is connected to the smoke collection assembly and is used to drive the smoke collection assembly to rise and fall; The ranging device is rotatably mounted on the chassis assembly and faces downwards, and is used to detect distance and generate ranging signals; The second driving device is connected to the ranging device and is used to drive the ranging device to rotate periodically within a preset angle range in the vertical plane; The controller connects the first driving device and the ranging device, and is used to determine the minimum vertical distance between the ranging device and the object below the ranging device based on the ranging signal generated by the ranging device during its rotation in a previous preset time period, and to control the first driving device to drive the smoke collection assembly based on the minimum vertical distance.

2. The range hood as described in claim 1, characterized in that, The vertical plane extends in the left-right direction, and the ranging device is positioned directly above the center of the corresponding burner head. The preset angle range includes the angle range between the first line and the second line. The first line is a vertical line passing through the center of the ranging device, and the second line is a line connecting the leftmost or rightmost edge of the burner head to the center of the ranging device; or The vertical plane extends in the front-to-back direction, and the ranging device is set directly above the center of the corresponding burner head. The preset angle range includes the angle between the first line and the third line, and the third line is the line connecting the foremost or last edge point of the burner head to the center of the ranging device.

3. The range hood as described in claim 2, characterized in that, The ranging device includes a left ranging device and a right ranging device. The left ranging device is located directly above the center of the left furnace head, and the right ranging device is located directly above the center of the right furnace head.

4. The range hood as described in claim 3, characterized in that, The second driving device includes a left driving device and a right driving device. The left driving device is connected to the left ranging device, and the right driving device is connected to the right ranging device. The controller is also connected to the left driving device and the right driving device respectively to control the left driving device and the right driving device to drive the corresponding ranging device.

5. The range hood as described in claim 1, characterized in that, The vertical plane extends in the left-right direction, and the ranging device is set directly above the center of the two burners. The preset angle range includes the angle range between the fourth line and the fifth line. The fourth line is the line connecting the center of the ranging device and the center of the left burner, and the fifth line is the line connecting the center of the ranging device and the center of the right burner.

6. The range hood according to any one of claims 1 to 5, characterized in that, The controller is also connected to the second drive device and is used to control the second drive device to drive the ranging device.

7. The range hood according to any one of claims 1 to 5, characterized in that, The air intake is equipped with an openable and closable air guide plate, and the controller is also used to control the opening and closing of the air guide plate according to the minimum vertical distance.

8. The range hood according to any one of claims 1 to 5, characterized in that, The ranging device is located at the bottom of the smoke collection assembly.

9. The range hood according to any one of claims 1 to 5, characterized in that, The ranging device is an ultrasonic ranging device.

10. A method for controlling a range hood, characterized in that, include: The range measuring device of the range hood is controlled to rotate periodically on the casing assembly of the range hood within a preset angle range in the vertical plane; During the rotation of the ranging device, the distance below is detected by the ranging device and a ranging signal is generated; Based on the ranging signal generated during the rotation of the ranging device within a previous preset time period, the minimum vertical distance between the ranging device and the object below the ranging device is determined; and The range hood's smoke collection assembly is raised and lowered based on the minimum vertical distance.

11. The range hood control method as described in claim 10, characterized in that, The step of determining the minimum vertical distance between the ranging device and the object below the ranging device based on the ranging signal generated during the rotation of the ranging device within a previous preset time period includes: Based on the distance measurement signal and real-time rotation angle information generated in real time during the rotation process of the distance measuring device within the previous preset time period, the corresponding vertical distance is determined according to trigonometric relationships; and The minimum value among all vertical distances determined within the previous preset time period is the minimum vertical distance.

12. The range hood control method as described in claim 10, characterized in that, The method of controlling the lifting and lowering of the smoke collection component of the range hood based on the minimum vertical distance includes: At least based on the minimum vertical distance h i minimum vertical distance h i-1 The difference between them controls the raising and lowering of the smoke collection assembly, wherein the minimum vertical distance h i and the minimum vertical distance h i-1 The distances are determined based on the distance measurement signals generated by the ranging device during the rotation process in the i-th and i-1-th preset time periods after the range hood is started, respectively, at the minimum vertical distance h. i Greater than the minimum vertical distance h i-1 At that time, the smoke collection assembly is controlled to descend, at the minimum vertical distance h. i Less than the minimum vertical distance h i-1 At that time, the smoke collection assembly is controlled to rise.

13. The range hood control method as described in claim 12, characterized in that, The minimum vertical distance h is at least based on i minimum vertical distance h i-1 The difference between them controls the raising and lowering of the smoke collection assembly, including: Determine the minimum vertical distance h i With the minimum vertical distance h i-1 The difference; The timing of the raising and lowering of the smoke collection assembly is determined at least based on the difference. The smoke collection assembly is controlled to rise and fall based on the determined time.

14. The range hood control method as described in claim 13, characterized in that, Determining the lifting and lowering time of the smoke collection assembly based at least on the difference includes: determining the lifting and lowering time T of the smoke collection assembly based on the following formula: ， Where v represents the lifting speed of the smoke collection assembly.

15. The range hood control method according to any one of claims 12 to 14, characterized in that, The minimum vertical distance h is at least based on i minimum vertical distance h i-1 The difference between them, controlling the raising and lowering of the smoke collection assembly, also includes: At the minimum vertical distance h i-1 When the distance is greater than or equal to the first preset distance, based on the minimum vertical distance h i Control the smoke collection assembly during time period T i Internal decline, among which h 01 Indicates the second preset distance; Wherein, the minimum vertical distance h i Less than the minimum vertical distance h i-1 At that time, the smoke collection assembly is controlled to rise, only at the minimum vertical distance h. i-1 Execute when the distance is greater than or equal to the first preset distance.

16. The range hood control method as described in claim 15, characterized in that, At least according to the minimum vertical distance h i minimum vertical distance h i-1 Before controlling the raising and lowering of the smoke collection assembly, the method further includes: Based on the minimum vertical distance h i Make sure the cooking utensils on the stove have not been removed; When it is determined that the cooking appliance has been removed, the smoke collection assembly is controlled to reset.

17. The range hood control method as described in claim 15, characterized in that, The method further includes: controlling the smoke collection assembly to reset when the range hood is turned off.

18. The range hood control method according to any one of claims 10 to 14, characterized in that, The ranging device includes a left ranging device and a right ranging device. The left ranging device is positioned directly above the left furnace head, and the right ranging device is positioned directly above the right furnace head. The step of determining the minimum vertical distance between the ranging device and the object below the ranging device based on the ranging signal generated during the rotation of the ranging device within a previous preset time period includes: Based on the distance measurement signal generated by the left distance measuring device during its rotation within the i-th preset time period after the range hood is started, the minimum vertical distance h between the left distance measuring device and the object below the left distance measuring device is determined. il ; Based on the ranging signal generated by the right ranging device during its rotation within the i-th preset time period, the minimum vertical distance h between the right ranging device and the object below the right ranging device is determined. ir ; Compare the minimum vertical distance h il With the minimum vertical distance h ir ; Determine the minimum vertical distance h il minimum vertical distance h ir The smaller of the two is the minimum vertical distance between the ranging device and the object below the ranging device.

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