Control method for automatically recognizing replacement of a pot by a lifting hood

Abstract

The application provides a control method for automatically identifying and replacing a pot of a lifting range hood, and relates to the technical field of the lifting range hood, and comprises the following steps: S1: acquiring a front distance B sensed by a sensor; S2: when the sensor-sensed distance is greater than the distance B, performing S3; S3: judging whether the sensor-sensed distance is not greater than the distance B, if yes, the range hood is moved upward, otherwise, the range hood is moved downward; S4: judging whether the sensor-sensed distance is greater than the distance between the sensor and the cooking table, if yes, the range hood is stopped, and an sensed distance value is acquired; S5: judging whether the sensor-sensed distance is less than the distance between the sensor and the cooking table, if yes, the telescopic part is stopped, and the sensed distance value is acquired; and S6: controlling the lifting of the range hood and correcting a height value. The application judges the pot-replacing operation of a user by detecting the distance change of the sensor, judges the condition of replacing the new pot by the distance value after the pot is replaced, adjusts the distance of the smoke collection cavity by the height from the sensor to the plane of the new pot, and is intelligent and has high recognition accuracy.

Description

Control method for automatic identification and replacement of cookware in a range hood Technical Field

[0001] This invention relates to the field of lifting range hood technology, and in particular, to a control method for automatically identifying and replacing cookware in a lifting range hood. Background Technology

[0002] A lift-up range hood is a type of range hood whose smoke collection chamber can be raised and lowered. By changing the position of the smoke collection chamber, the distance between the chamber and the cookware is reduced, thereby improving the suction effect. When not in use, the smoke collection chamber can also be retracted, reducing the size of the range hood and making it easier for the user to operate. In existing technology, the raising and lowering of the smoke collection chamber is typically controlled by a sensor that detects the distance to the cookware. Then, after matching the distance to the optimal smoke extraction effect, the height of the smoke collection chamber is adjusted to maintain the distance between the chamber and the cookware at that optimal distance.

[0003] There are increasingly more designs for lifting range hoods. For example, there is an existing intelligent lifting range hood, which includes a housing, a smoke guide plate or smoke collection hood located below the housing, a drive motor inside the housing for raising or lowering the smoke guide plate or smoke collection hood, and a control board electrically connected to the drive motor for starting or stopping the drive motor. The drive motor is connected to the smoke guide plate or smoke collection hood through a transmission mechanism, which converts the rotational motion of the drive motor's output shaft into the up-and-down motion of the smoke guide plate or smoke collection hood. A first magnet is located inside the housing, connected to the output shaft of the drive motor and driven to rotate by the drive motor. A detection device is also located inside the housing opposite the first magnet. The control board detects the rotation angle of the drive motor in real time based on the output signal of the detection circuit to obtain the current lifting position of the smoke guide plate or smoke collection hood. This invention can accurately obtain the current lifting position of the smoke guide plate or smoke collection hood, achieving intelligent control of the smoke extraction effect.

[0004] However, due to the diverse cooking needs of users, it may be necessary to change pots during the cooking process. If a user changes pots according to their cooking needs, the originally preset height will not match the new pot, and the smoke extraction effect will not be optimal. It is necessary to manually press the relevant key position of the range hood to readjust the height of the smoke collection chamber to achieve the best smoke extraction effect, which is a rather troublesome process. Especially when a user changes from a small pot to a large pot, the original matching height of the smoke collection chamber may reduce the user's operating space and affect the user experience.

[0005] Therefore, in order to solve the above problems, it is necessary for us to design a reasonable and efficient control method for automatic identification and replacement of cookware by lifting range hood. Summary of the Invention

[0006] The purpose of this invention is to provide a control method for an adjustable range hood that automatically identifies and changes cookware. The method uses sensors to detect changes in distance to determine if the user is changing cookware. By comparing the distance value after the change with a preset standard value, the method determines the height of the new cookware and controls the range hood to rise or fall accordingly to obtain the height of the sensor from the new cookware plane. This adjusts the distance of the smoke collection chamber. The method is highly intelligent and has high accuracy in identifying cookware changes.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] A control method for automatically identifying and changing cookware in a lifting range hood, the method comprising the following steps:

[0009] S1: The main controller acquires the sensing distance in front of the sensor, which is denoted as the standard distance B;

[0010] S2: Determine whether the sensing distance in front of the sensor has changed and whether the changed distance value is greater than the standard distance B. If so, proceed to step S3; otherwise, do not perform the operation.

[0011] S3: Determine whether the sensing distance in front of the sensor has changed and whether the changed distance value is not greater than the standard distance B. If so, the lifting range hood moves upward and executes step S4; otherwise, the lifting range hood moves downward and executes step S5.

[0012] S4: Real-time determination of whether the sensing distance in front of the sensor is greater than the standard distance B. If so, the lifting range hood stops moving; otherwise, the lifting range hood continues to move upward.

[0013] S5: In real time, determine whether the sensing distance in front of the sensor is not greater than the standard distance B. If so, the lifting range hood stops moving; otherwise, the lifting range hood continues to move downward.

[0014] As a preferred embodiment of the present invention, step S6 is further included: when the lifting range hood stops moving, the current sensing distance value in front of the sensor is obtained, the height difference H between the sensor and the horizontal plane of the cookware is calculated, and the main controller controls the lifting range hood to lift and lower through the range hood lifter to complete the adjustment of the lifting range hood.

[0015] As a preferred embodiment of the present invention, the sensor is inclined downward toward the stove head;

[0016] When executing step S1, after the lifting smoke machine has started up and entered normal working state, the main controller obtains the sensing distance in front of the sensor and the angle α between the sensor's orientation and the vertical direction.

[0017] When performing step S6, the height difference H between the sensor and the horizontal plane of the cookware is calculated based on the current sensing distance value in front of the sensor and the angle α between the sensor's orientation direction and the vertical direction.

[0018] As a preferred embodiment of the present invention, if the sensing distance in front of the sensor does not change during step S2, or if the distance changes but the changed distance value is not greater than the standard distance B, it indicates that the cookware is still on the stove and no operation is performed.

[0019] As a preferred embodiment of the present invention, step S3 is specifically performed as follows:

[0020] S31: Determine whether the sensing distance in front of the sensor changes within the first predetermined time. If yes, proceed to step S32; otherwise, do not proceed.

[0021] S32: Determine whether the sensing distance in front of the sensor remains stable within the second predetermined time. If so, proceed to step S33; otherwise, do not proceed.

[0022] S33: Determine whether the value of the sensing distance in front of the sensor after the change has stabilized is not greater than the standard distance B; if so, the lifting range hood moves upward and executes step S4; otherwise, the lifting range hood moves downward and executes step S5.

[0023] As a preferred embodiment of the present invention, when performing step S3, the main controller controls the lifting and lowering of the range hood through the range hood lifter.

[0024] As a preferred embodiment of the present invention, when performing step S4, when the lifting range hood moves upward, it is determined whether the lifting range hood has moved to the upper limit position. If so, an alarm is issued; otherwise, no operation is performed.

[0025] As a preferred embodiment of the present invention, when performing step S5, when the lifting range hood moves downward, it is determined whether the lifting range hood has moved downward to the lower limit position. If so, an alarm is issued; otherwise, no operation is performed.

[0026] As a preferred embodiment of the present invention, when performing step S6, the current sensing distance value L in front of the sensor and the angle α between the sensor's orientation direction and the vertical direction are obtained, and the height difference H between the sensor and the horizontal plane of the cookware is calculated as L*cos α.

[0027] As a preferred embodiment of the present invention, when performing step S6, the required adjustment distance value of the lifting range hood is calculated based on the height difference H between the sensor and the horizontal plane of the cookware. It is then determined whether the adjustment distance value is not less than the preset accuracy value X. If so, the main controller controls the lifting range hood to raise or lower the adjustment distance value through the range hood lifter, thereby completing the lifting range hood control; otherwise, no operation is performed.

[0028] The beneficial effects of the automatic identification and cookware replacement control method of the lifting range hood of the present invention are as follows: the user's cookware replacement operation is judged by detecting the distance change through the sensor, and the height of the new cookware is judged by comparing the distance value after the cookware replacement with the preset standard value. The lifting range hood is then controlled to rise or fall accordingly to obtain the height of the sensor to the new cookware plane after the cookware replacement, thereby adjusting the distance of the smoke collection chamber. It is highly intelligent and has high accuracy in identifying cookware replacement. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 is a schematic diagram of the control flow of an embodiment of the control method for automatic identification and replacement of cookware in a lifting range hood according to the present invention.

[0031] Figure 2 is a side view of the control structure of the lifting range hood according to the present invention, which is a control method for automatically identifying and replacing cookware in a lifting range hood.

[0032] Figure 3 is a top view of the control structure of the lifting range hood according to the present invention, which is a control method for automatically identifying and replacing cookware in a lifting range hood. Detailed Implementation

[0033] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0034] In the following description, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The following description provides multiple embodiments of this application, which can be substituted or combined with each other. Therefore, this application can also be considered to include all possible combinations of the same and / or different embodiments described. Thus, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then this application should also be considered to include embodiments containing one or more other possible combinations of A, B, C, and D, even if such embodiments are not explicitly described in the following text.

[0035] The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made to the function and arrangement of the described elements without departing from the scope of this application. Various processes or components may be appropriately omitted, substituted, or added to the examples. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.

[0036] Example: Please refer to Figures 1 to 3. The present invention provides a control method for automatic identification and replacement of cookware by a lifting range hood. The method is applicable to a lifting range hood control structure, which includes: a burner mounted on the stove, a lifting range hood mounted on the upper side behind the burner, and a sensor mounted on the lower side of the lifting range hood. The sensor is inclined downward toward the burner. The lifting range hood is equipped with a main controller electrically connected to the sensor and a range hood lifter electrically connected to the main controller.

[0037] In this invention, the burner is set on the stove platform for placing cookware. With the direction from which the worker stands as the front, the lifting range hood is set on the upper side behind the burner. The lifting range hood can be raised and lowered. When it is lowered, it can extend to the back of the cookware to extract steam and fumes from the cookware.

[0038] It should be noted that the lifting part of the range hood is actually the smoke collection chamber. All references to "lifting and lowering of the range hood" in the following text refer to "the smoke collection chamber lifting and lowering".

[0039] A sensor is installed on the lower side of the range hood. The sensor is preferably an infrared rangefinder and is tilted downwards towards the stove. The sensor can measure the distance to obstacles in front of it. It is generally used to measure the distance to pots and pans placed on the stove in front of it. The tilt angle will not exceed 45° so that the front of the sensor is always on the stove and can detect whether there are pots or pans on the stove.

[0040] In addition, the lifting smoke machine is equipped with a main controller for electrical connection with the sensor, so that the sensor can obtain the distance of the obstacle in front (hereinafter referred to as the sensor front sensing distance) and then send it to the main controller;

[0041] The lifting smoke machine is also equipped with a smoke machine lifter that is electrically connected to the main controller. In other words, the main controller controls the lifting and lowering of the smoke collection chamber of the lifting smoke machine through the smoke machine lifter.

[0042] The method includes the following steps:

[0043] S1: The main controller acquires the sensing distance in front of the sensor, which is denoted as the standard distance B;

[0044] As an optional embodiment of this application, the main controller obtains the distance between the front of the sensor and the pot under certain conditions. It should be done after the height of the smoke collection chamber is adjusted when the range hood is started, and after ensuring that the range hood is started and enters normal working state.

[0045] When the range hood is first used, it is manually turned on to start. Then, the range hood is adjusted by controlling the function button or by automatically lowering it until the height of the smoke collection chamber corresponds to the pot on the stove. After the height of the smoke collection chamber is adjusted, the sensor can detect the presence of the pot in front, and the main controller obtains the distance between the sensor and the pot.

[0046] Meanwhile, the sensor is tilted downwards towards the stove head, so after the lifting range hood completes the start-up and enters the working state, the main controller also obtains the angle α between the sensor's orientation direction and the vertical direction.

[0047] At this point, the height difference between the range hood and the cookware can be considered the optimal height difference, and the distance between the sensor and the edge of the cookware is also the optimal distance, which can be regarded as the standard distance B.

[0048] Generally, when performing step S1, after recording the standard distance B, the sensor continues to detect the distance and transmits the distance data to the main controller, but the standard distance B remains unchanged.

[0049] S2: Determine whether the sensing distance in front of the sensor has changed and whether the changed distance value is greater than the standard distance B. If so, proceed to step S3; otherwise, do not perform the operation.

[0050] As an optional embodiment of this application, during the cooking process, kitchen staff will inevitably touch the pot. At this time, the real-time distance in front of the sensor will change. If the real-time distance is less than the standard distance B, it indicates that the staff is tossing and stirring the pot during cooking, and no operation is performed. Conversely, if the real-time distance is greater than the standard distance B, it can be considered that the staff has removed the pot, and further judgment is needed to execute step S3.

[0051] In summary, if the sensing distance in front of the sensor does not change, or if it changes and the changed distance is less than or equal to the standard distance B, it means that the pot is still on the stove.

[0052] Conversely, if the sensing distance in front of the sensor changes and the changed distance value is greater than the standard distance B, then the pot has been removed and further detection is required.

[0053] S3: Determine whether the sensing distance in front of the sensor has changed and whether the changed distance value is not greater than the standard distance B. If so, the lifting range hood moves upward and executes step S4; otherwise, the lifting range hood moves downward and executes step S5.

[0054] Here, when performing step S3, it is determined whether the sensing distance in front of the sensor changes within a predetermined time and whether the changed distance value is less than the standard distance B; if so, the lifting range hood moves upward and step S4 is executed; otherwise, the lifting range hood moves downward and step S5 is executed.

[0055] Specifically, step S3 includes the following steps:

[0056] S31: Determine whether the sensing distance in front of the sensor changes within the first predetermined time. If yes, proceed to step S32; otherwise, do not proceed.

[0057] S32: Determine whether the sensing distance in front of the sensor remains stable within the second predetermined time. If so, proceed to step S33; otherwise, do not proceed.

[0058] S33: Determine whether the value of the sensing distance in front of the sensor after the change has stabilized is not greater than the standard distance B; if so, the lifting range hood moves upward and executes step S4; otherwise, the lifting range hood moves downward and executes step S5.

[0059] As an optional embodiment of this application, if the cooking operation is not stopped after the pot is removed, the pot will still be placed back on the stove. If the sensing distance in front of the sensor changes within a predetermined time after the pot is removed, and the changed distance value is not greater than the standard distance, it means that the pot has been put back on the stove; otherwise, the pot has not been put back, or the pot has not been sensed.

[0060] It's important to note that removing the cookware usually means emptying the food, rinsing the cookware, or replacing the cookware. The first two situations can be understood as the cookware not being replaced, while the latter indicates that the cookware has been replaced.

[0061] If the cookware is not replaced, it means that the real-time distance between the sensor and the cookware will be restored to the sensor distance value recorded by the main controller in step S1. This value is still not greater than the standard distance B, which can be regarded as the cookware being put back.

[0062] If the cookware has been replaced, there are two scenarios: either a taller new cookware or a shorter new cookware. If it is a taller new cookware, the real-time distance between the sensor and the cookware will still not exceed the standard distance B. Conversely, if it is a shorter new cookware, the real-time distance between the sensor and the cookware will exceed the standard distance B.

[0063] Here, if a shorter pot is placed back, the sensor will still detect a change in distance as long as the pot passes in front of it. However, after the change, the sensor will still detect a distance greater than the standard distance B after the shorter pot is placed on the stove.

[0064] In summary, if the real-time distance between the sensor and the cookware changes within the predetermined time, it means the cookware has been put back; conversely, if the real-time distance between the sensor and the cookware does not change within the predetermined time, it means the cookware has not been put back.

[0065] If the real-time distance between the sensor and the cookware changes within a predetermined time and the stable value after the change is not greater than the standard distance B, it means that the cookware has been put back. It may be the original cookware or a cookware that is higher. At this time, the range hood should be moved upward and step S4 should be executed.

[0066] Conversely, if the real-time distance between the sensor and the cookware changes within a predetermined time and the stable value after the change is greater than the standard distance B, it indicates that the cookware has been put back and the new cookware is too short. In this case, the range hood should be moved downward and step S5 should be executed.

[0067] In this invention, before executing step S3, a first predetermined time value is preset; it is generally set to 20 seconds to 100 seconds, depending on the work habits of the staff; a second predetermined time value is preset, generally 1 second, that is, if the pot is put back for one second, it is considered that the pot has been put back and the sensing distance is stable.

[0068] Furthermore, when executing step S3, the main controller controls the lifting and lowering of the range hood via the range hood lifter.

[0069] It should be noted that the range hood has a lifting control, so the real-time distance sensed by the sensor in front will change as the range hood is raised or lowered.

[0070] S4: In real time, determine whether the sensing distance in front of the sensor is greater than the standard distance B. If so, the lifting range hood stops moving, obtains the current sensing distance value in front of the sensor, and executes step S6; otherwise, the lifting range hood continues to move upward.

[0071] As an optional embodiment of this application, before the range hood moves upward, there is a pot in front of the sensor, and the distance between the sensor and the pot is not greater than the standard distance B. When the range hood moves upward, once the distance between the sensor and the pot is greater than the standard distance B, it means that the sensor has lost the ability to sense the new pot in front, and at this time the position of the upper edge of the pot is known.

[0072] At this point, the lifting range hood stops moving upwards and records the current sensing distance value in front of the sensor. To be precise, it is the sensing distance value before the moment the sensor lost its sensing value.

[0073] Of course, if the distance between the sensor and the cookware is never greater than the standard distance B, it means that the edge of the cookware is not detected, and the range hood continues to move upward.

[0074] It is important to note that when performing step S4, if the range hood moves upward, it is determined whether the range hood has moved to the upper limit. If the range hood has moved to the upper limit and there is still no sensor loss, it may be that the pot is too high or that the sensor is faulty, and an alarm should be issued. Otherwise, no operation is performed, that is, the range hood continues to move upward.

[0075] S5: In real time, determine whether the sensing distance in front of the sensor is not greater than the standard distance B. If so, the lifting range hood stops moving, obtains the current sensing distance value in front of the sensor, and executes step S6; otherwise, the lifting range hood continues to move down.

[0076] As an optional embodiment of this application, before the range hood moves downward, there is no pot in front of the sensor. The sensor senses that the distance in front is greater than the standard distance B. When the range hood moves downward, once the sensor senses that the distance in front is not greater than the standard distance B, it means that the sensor senses that there is a pot in front, and at this time the position of the upper edge of the pot is known.

[0077] At this point, the lifting range hood stops moving downwards and records the current sensing distance value in front of the sensor. To be precise, it is the sensing distance value at the instant after the sensor senses the distance in front.

[0078] Of course, if the distance between the sensor and the cookware is never less than the standard distance B, then it means that the edge of the cookware is not detected, and the range hood continues to move downward.

[0079] It should be noted that when performing step S5, when the range hood moves downward, it is determined whether the range hood has moved down to the lower limit. If the range hood has moved down to the lower limit and no sensor detects an obstacle, it may be that the cookware is too short or the sensor is faulty, and an alarm should be issued; otherwise, no operation is performed, that is, the range hood continues to move downward.

[0080] Furthermore, when performing step S5, as the range hood moves downward, the sensor height is acquired in real time to determine whether the real-time sensor height is not lower than the height of the stove head (or reaches below the predetermined height from the stove head). If so, the range hood continues to move downward; otherwise, an alarm is issued.

[0081] In other words, once the range hood has moved down to the height of the stove, and no pot is detected before the extension rod reaches this height, the range hood should not continue to move down and should issue an alarm indicating that no pot has been placed inside.

[0082] In addition, the present invention also includes step S6: when the range hood stops moving, the current sensing distance value in front of the sensor is obtained, and based on the current sensing distance value in front of the sensor and the angle α between the sensor's orientation direction and the vertical direction, the height difference H between the sensor and the horizontal plane of the cookware is calculated. The main controller controls the range hood to rise and fall through the range hood lifter to complete the adjustment of the range hood.

[0083] As an optional embodiment of this application, when performing step S6, the current sensing distance value L in front of the sensor and the angle α between the sensor's orientation direction and the vertical direction are obtained, and the height difference H between the sensor and the horizontal plane of the pot is calculated as L*cos α.

[0084] Furthermore, when executing step S6, the required adjustment distance value of the lifting range hood is calculated based on the height difference H between the sensor and the horizontal plane of the cookware. It is then determined whether the adjustment distance value is not less than the preset accuracy value X. If so, the main controller controls the lifting range hood to raise or lower the range hood by the adjustment distance value through the range hood lifter, thus completing the lifting range hood control; otherwise, no operation is performed.

[0085] Here, the preset accuracy value X is a preset value. If the required adjustment distance of the lifting smoke machine is less than the preset accuracy value X, it is considered that the lifting adjustment of the lifting smoke machine has little impact on the smoke extraction effect, and it is assessed that no adjustment is needed to prevent the smoke collection chamber from frequently moving in height, which would be unpleasant for the staff. Conversely, if the required adjustment distance is not less than the preset accuracy value X, then the lifting smoke machine needs to be raised or lowered.

[0086] This invention discloses a control method for automatically identifying and changing cookware in a lifting range hood. The method uses sensors to detect changes in distance to determine if the user is changing cookware. By comparing the distance value after the change with a preset standard value, the method determines the height of the new cookware and controls the lifting range hood to rise or fall accordingly to obtain the height of the sensor from the new cookware plane. This adjusts the distance of the smoke collection chamber. The method is highly intelligent and has high accuracy in identifying cookware changes.

[0087] The foregoing description is merely an exemplary embodiment of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Those skilled in the art will readily conceive of embodiments of this disclosure upon considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described herein. The specification and embodiments are to be considered exemplary only, and the scope and spirit of this disclosure are defined by the claims.

Claims

1. A control method for automatically identifying and changing cookware in a lifting range hood, characterized in that, The method includes the following steps: S1: The main controller acquires the sensing distance in front of the sensor, denoted as the standard distance B; the sensor is tilted downwards towards the stove head to measure the distance between the sensor and the pot placed in front of the stove head; S2: Determine whether the sensing distance in front of the sensor has changed and whether the changed distance value is greater than the standard distance B. If so, proceed to step S3; otherwise, do not perform the operation; S3: Determine whether the sensing distance in front of the sensor has changed again and whether the changed distance value is not greater than the standard distance B. If so, the range hood moves upwards and proceeds to step S4; otherwise, the range hood moves downwards and proceeds to step S5; S4: Real-time determination of whether the sensing distance in front of the sensor is greater than the standard distance B. If so, the lifting range hood stops moving; otherwise, the lifting range hood continues to move upward. S5: In real time, determine whether the sensing distance in front of the sensor is not greater than the standard distance B. If so, the lifting range hood stops moving; otherwise, the lifting range hood continues to move downward.

2. The control method for automatic identification and replacement of cookware by a lifting range hood according to claim 1, characterized in that: It also includes step S6: when the lifting range hood stops moving, the current sensing distance value in front of the sensor is obtained, the height difference H between the sensor and the horizontal plane of the pot is calculated, and the main controller controls the lifting range hood to lift and lower through the range hood lifter to complete the adjustment of the lifting range hood.

3. The control method for automatically identifying and replacing cookware in a lifting range hood according to claim 2, characterized in that: When executing step S1, after the lifting range hood completes startup and enters normal working state, the main controller obtains the sensing distance in front of the sensor and the angle α between the sensor's orientation direction and the vertical direction; when executing step S6, based on the current sensing distance value in front of the sensor and the angle α between the sensor's orientation direction and the vertical direction, the height difference H between the sensor and the horizontal plane of the cookware is calculated.

4. The control method for automatically identifying and changing cookware in a lifting range hood according to claim 1, characterized in that: If the sensing distance in front of the sensor does not change during step S2, or if the distance changes but the changed distance value is not greater than the standard distance B, then no operation is performed.

5. The control method for automatically identifying and changing cookware in a lifting range hood according to claim 1, characterized in that: When executing step S3, specifically: S31: Determine whether the sensing distance in front of the sensor changes within a first predetermined time. If yes, proceed to step S32; otherwise, do not execute the operation. S32: Determine whether the sensing distance in front of the sensor remains stable within a second predetermined time. If yes, proceed to step S33; otherwise, do not execute the operation. S33: Determine whether the value of the sensing distance in front of the sensor after the change stabilizes is not greater than the standard distance B. If yes, the lifting range hood moves upward and proceeds to step S4; otherwise, the lifting range hood moves downward and proceeds to step S5.

6. The control method for automatically identifying and changing cookware in a lifting range hood according to claim 5, characterized in that: When executing step S3, the main controller controls the lifting and lowering of the range hood via the range hood lifter.

7. The control method for automatically identifying and changing cookware in a lifting range hood according to claim 1, characterized in that: When performing step S4, if the lifting range hood moves upward, determine whether the lifting range hood has moved to the upper limit position. If so, issue an alarm; otherwise, do not perform the operation.

8. The control method for automatically identifying and replacing cookware in a lifting range hood according to claim 1, characterized in that: When performing step S5, if the lifting range hood moves downward, determine whether the lifting range hood has moved to the lower limit. If so, issue an alarm; otherwise, do not perform the operation.

9. The control method for automatically identifying and changing cookware in a lifting range hood according to claim 2, characterized in that: When executing step S6, the current sensing distance value L in front of the sensor and the angle α between the sensor's orientation direction and the vertical direction are obtained, and the height difference H between the sensor and the horizontal plane of the pot is calculated as L*cosa.

10. The control method for automatic identification and replacement of cookware by a lifting range hood according to claim 2, characterized in that: When executing step S6, the required adjustment distance value of the range hood is calculated based on the height difference H between the sensor and the horizontal plane of the cookware. It is then determined whether the adjustment distance value is not less than the preset accuracy value X. If so, the main controller controls the range hood to raise or lower the range hood by the adjustment distance value through the range hood lifter, thus completing the range hood control. Otherwise, no operation is performed.

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