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 C sensed by a sensor; S2: when the distance sensed by the sensor changes to be greater than C, performing S3; S3: when the distance sensed by the sensor changes to be not greater than C, the sensor rotates upward and performs S4; otherwise, the sensor rotates downward and performs S5; S4: when the distance sensed by the sensor is greater than C, the sensor stops rotating, and the sensed distance value and the included angle are acquired; S5: when the distance sensed by the sensor is less than the corrected value of C, the sensor stops rotating, and the sensed distance value and the included angle are acquired; and S6: the range hood is lifted. The application judges the user's pot replacing operation by detecting the distance change of the sensor, compares the distance value after the pot is replaced with a preset standard value to judge the height of the new pot replaced by the user, adjusts the distance of the smoke collecting cavity according to the height of the sensor to the plane of the new pot, and is intelligent and has high recognition accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lifting range hood, in particular, the present application relates to a control method for automatic identification and replacement of the pot of lifting range hood. BACKGROUND

[0002] The lifting range hood is a kind of range hood with lifting cavity. By changing the position of the cavity, the distance between the cavity and the pot is reduced to improve the suction effect. The cavity can be retracted when not in use to reduce the size of the range hood and facilitate user operation. In the prior art, the lifting control of the cavity is usually achieved by setting a sensor to detect the distance of the pot, and then adjusting the height of the cavity to keep the distance between the cavity and the pot at the optimal suction distance.

[0003] Now there are more and more structure designs for lifting range hood. For example, an intelligent lifting range hood includes a housing, a smoke guide plate or a smoke collecting cover arranged below the housing, a drive motor arranged in the housing for driving the smoke guide plate or the smoke collecting cover to rise or fall, a control panel electrically connected with the drive motor for starting or stopping the drive motor, and a transmission mechanism for converting the rotary motion of the output shaft of the drive motor into the up-down motion of the smoke guide plate or the smoke collecting cover. The housing is provided with a first magnet coupled with the output shaft of the drive motor and driven to rotate by the drive motor. The housing is also provided with a detection device opposite to the first magnet. The control panel detects the rotation angle of the drive motor in real time according to the output signal of the detection circuit to obtain the current lifting position of the smoke guide plate or the smoke collecting cover. The above-mentioned application can accurately obtain the current lifting position of the smoke guide plate or the smoke collecting cover to achieve the purpose of intelligent control of the suction effect of the range hood.

[0004] However, due to the diversity of user's cooking needs, the pot may need to be replaced during cooking. If the user replaces the pot according to the cooking needs, the originally preset height cannot match the newly replaced pot, and the suction effect cannot reach the best. The user needs to manually press the relevant key position of the range hood to re-adjust the height of the smoke collecting cavity to make the suction effect reach the best, which is troublesome. Especially when the user replaces a large pot with a small pot, the originally matched height of the smoke collecting cavity may make the user's operation space small, affecting 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 the pot of lifting range hood. SUMMARY

[0006] The purpose of the present application is to provide a control method for automatically identifying and replacing the pot of a liftable range hood, which judges the user's pot replacement operation by detecting the distance change through a sensor, judges the height of the new pot placed by the user by comparing the distance value after the pot replacement with the preset standard value, and controls the rotation of the sensor to obtain the height of the sensor to the plane of the new pot after the pot replacement, so as to adjust the distance of the smoke collection cavity, which is intelligent and has high recognition accuracy for the replacement of the pot.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] A control method for automatically identifying and replacing the pot of a liftable range hood, the method comprising the following steps:

[0009] S1: The main controller obtains the sensing distance in front of the sensor, denoted as the standard distance C;

[0010] The sensor is arranged on the lower side of the liftable range hood and rotates around the connection with the liftable range hood, and the rotation surface of the sensor is located on the plane formed by the connection of the sensor and the liftable range hood, the projection of the connection of the sensor and the liftable range hood on the cooking table, and the center of the cooking table where the pot is placed;

[0011] S2: It is judged whether the sensing distance in front of the sensor changes and the distance value after the change is greater than the standard distance C, and if so, step S3 is executed; otherwise, no operation is performed;

[0012] S3: It is judged whether the sensing distance in front of the sensor changes and the distance value after the change is not greater than the standard distance C, and if so, the sensor rotates upward, and step S4 is executed, otherwise, the sensor rotates downward, and step S5 is executed;

[0013] S4: It is judged whether the real-time sensing distance in front of the sensor is greater than the standard distance C, and if so, the sensor stops rotating, and the sensing distance value in front of the sensor and the real-time angle value of the sensor are obtained; otherwise, the sensor continues to rotate upward;

[0014] S5: It is judged whether the real-time sensing distance in front of the sensor is not greater than the predetermined distance, and if so, the sensor stops rotating, and the sensing distance value in front of the sensor and the real-time angle value of the sensor are obtained; otherwise, the sensor continues to rotate downward.

[0015] As a preferred embodiment of the present application, after the sensing distance value in front of the sensor and the real-time angle value of the sensor are obtained in step S4, step S6 is executed;

[0016] In step S5, after the sensing distance value in front of the sensor and the real-time angle value of the sensor are obtained, step S6 is executed;

[0017] S6: Based on the sensor's forward sensing distance value and the sensor's real-time angle value, the height difference H between the sensor and the cookware's horizontal plane is calculated. The main controller then controls the range hood to rise and fall via the range hood lifter, thus completing the range hood adjustment.

[0018] As a preferred embodiment of the present invention, when performing step S1, after the lifting smoke machine has started up and entered normal working state, the main controller acquires the sensing distance in front of the sensor, which is recorded as the standard distance C.

[0019] 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 C, then no operation is performed.

[0020] As a preferred embodiment of the present invention, when performing step S3, it is determined whether the sensing distance in front of the sensor changes within a predetermined time and the changed distance value is less than the standard distance C. If so, the sensor rotates upward and step S4 is performed; otherwise, the sensor rotates downward and step S5 is performed.

[0021] Specifically, step S3 includes:

[0022] 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.

[0023] 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.

[0024] 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 C; if so, the sensor rotates upward and executes step S4; otherwise, the sensor rotates downward and executes step S5.

[0025] As a preferred embodiment of the present invention, when performing step S1, the upper and lower limits of the sensor's rotation are obtained.

[0026] As a preferred embodiment of the present invention, when performing step S4, if the sensor rotates upward, it is determined whether the sensor has rotated upward to the upper limit position. If so, an alarm is issued; otherwise, no operation is performed.

[0027] As a preferred embodiment of the present invention, when performing step S5, if the sensor rotates downward, it is determined whether the sensor has rotated downward to the lower limit position. If so, an alarm is issued; otherwise, no operation is performed.

[0028] As a preferred embodiment of the present invention, a predetermined distance value is generated before performing step S5; wherein the predetermined distance value is equal to the standard distance C multiplied by a correction factor.

[0029] 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 real-time angle value b of the sensor are obtained, and the height difference H between the sensor and the horizontal plane of the pot is calculated as L*cos b.

[0030] As a preferred embodiment of the present invention, when performing step S6, the required adjustment distance value S = HM for the lifting range hood is calculated based on the height difference H between the sensor and the horizontal plane of the cookware and the preset optimal suction height value M. It is then determined whether the adjustment distance value S 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.

[0031] 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 by 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 sensor is rotated 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

[0032] 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.

[0033] Fig. 1 This is a schematic diagram of the control flow of an embodiment of a control method for automatically identifying and replacing cookware in a lifting range hood according to the present invention;

[0034] Fig. 2 This is a side view of the control structure of a lifting range hood, which is a control method for automatically identifying and changing cookware according to the present invention.

[0035] Fig. 3 This is a top view of the control structure of a lifting range hood, which is part of the control method for automatically identifying and changing cookware according to the present invention. Detailed Implementation

[0036] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0037] 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, C, C, and another embodiment includes features C, D, then this application should also be considered to include embodiments containing one or more of all other possible combinations of A, C, C, D, although such embodiments may not be explicitly described in the following text.

[0038] 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.

[0039] Example: Please refer to Figs. 1 to 3 This invention discloses a control method for automatically identifying and replacing cookware in a lifting range hood. The method is applicable to a lifting range hood control structure, which includes: a burner mounted on a stovetop, 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 extends downward and rotates around its connection point with the lifting range hood toward the burner. The lifting range hood contains a main controller electrically connected to the sensor and a range hood lifter electrically connected to the main controller.

[0040] 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.

[0041] 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".

[0042] A sensor is installed on the lower side of the range hood. The sensor is preferably an infrared rangefinder and extends downward. The sensor rotates around the connection point with the range hood towards the stove. The sensor can measure the distance to obstacles, generally the distance to pots and pans placed on the stove. The maximum tilt angle b0 generally does not exceed 45°, so that the sensor's sensing direction is always in front of the stove, for sensing whether there are pots and pans on the stove.

[0043] Here, the sensor's orientation has a minimum angle of 0 with the vertical direction, meaning it extends vertically downwards; the sensor's orientation has a maximum angle of b0 with the vertical direction, meaning it extends downwards towards the stove head; when the sensor rotates towards the maximum angle, it can be considered to rotate upwards; conversely, when the sensor rotates towards the minimum angle, it can be considered to rotate downwards.

[0044] 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;

[0045] 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.

[0046] The method includes the following steps:

[0047] S1: The main controller acquires the sensing distance in front of the sensor, which is denoted as the standard distance C;

[0048] The sensor is located on the lower side of the range hood and rotates around the connection point with the range hood. The rotating surface of the sensor is located on the plane formed by three points: the connection point between the sensor and the range hood, the projection of the connection point between the sensor and the range hood onto the stove, and the center of the stove where the pot is placed.

[0049] 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 working normally.

[0050] When the range hood is first used, it is manually turned on to start. Then, the range hood is adjusted by using 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 be tilted and detect the presence of the pot in front. The sensor angle is adjusted so that it just detects the edge of the pot away from the sensor. The main controller obtains the distance between the front of the sensor and the pot, which is recorded as the standard distance C.

[0051] At the same time, after the range hood completes the adjustment of the smoke collection chamber height during startup, the main controller obtains the maximum angle b0 between the sensor's orientation direction and the vertical direction. To be precise, the sensor can only tilt towards the direction where the cookware is placed on the stove. When the angle is at its maximum, the sensor is at its upper limit. When the angle is zero, that is, when the sensor is set to extend vertically downwards, the sensor is at its lower limit.

[0052] Generally, when executing step S1, after the main controller records the sensing distance C in front of the sensor, the sensor continues to sense the distance in front and continuously sends it to the main controller as a real-time distance value.

[0053] S2: Determine whether the sensing distance in front of the sensor has changed and the changed distance value is greater than the standard distance C. If so, proceed to step S3; otherwise, do not perform the operation.

[0054] As an optional embodiment of this application, during the cooking process, kitchen staff will inevitably touch the pot. At this time, the real-time sensing distance in front of the sensor will change. If the real-time sensing distance is less than or equal to the standard distance C, it indicates that the staff is tossing and stirring the pot during cooking, and no operation is performed. Conversely, if the real-time sensing distance is greater than the standard distance C, it can be considered that the staff has removed the pot, and further judgment is required to execute step S3.

[0055] In summary, if the real-time sensing distance in front of the sensor does not change, or if it changes and the changed distance value is not greater than the standard distance C, it means that the pot is still on the stove and the step is not executed; otherwise, once the sensing distance in front of the sensor changes and the changed distance value is greater than the standard distance C, the pot is removed and detection needs to continue, i.e., step S3 is executed.

[0056] S3: Determine whether the sensing distance in front of the sensor has changed and the changed distance value is not greater than the standard distance C. If so, the sensor rotates upward and proceeds to step S4; otherwise, the sensor rotates downward and proceeds to step S5.

[0057] In fact, when executing 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 not greater than the standard distance C. If so, step S4 is executed; otherwise, step S5 is executed.

[0058] 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 first predetermined time after the pot is removed, and the distance value at the moment of change is less than the standard distance C, it indicates that the sensor senses that the pot has passed by, and it can be considered that the pot has been put back. Otherwise, no pot has passed by, or no pot has been sensed.

[0059] It should be noted that taking away the pot usually means pouring out the food, rinsing the pot, or replacing the pot. The first two situations can be understood as not replacing the pot, while the latter means that the pot has been replaced.

[0060] When the sensor detects a pot passing in front of it, it needs to determine whether the sensing distance in front of the sensor is stable, that is, whether the state of the object in front is stable. If the pot is placed back on the stove and the new pot is high, the sensor will directly sense the new pot, and the sensing distance will remain stable within the second predetermined time. If the pot is not placed back on the stove or the new pot is placed back at a lower position, the sensor will sense the distance to the stove. This value will also remain stable within the second predetermined time. At this time, further sensing is required.

[0061] If the cookware is not replaced, that is, the cookware that is put back is the same as the original cookware, then the real-time distance between the front of the sensor and the cookware will be restored to the sensor sensing distance value C recorded by the main controller in step S1. This value still meets the requirement of not being greater than the standard distance C, 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 C. Conversely, if it is a shorter new cookware, the real-time distance between the sensor and the cookware will exceed the standard distance C.

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

[0064] In summary, if the real-time distance between the sensor and the cookware changes within the predetermined time and the instantaneous distance is less than the standard distance C, it means that the cookware has been put back; otherwise, if the real-time distance between the sensor and the cookware does not change within the predetermined time, it means that the cookware has not been put back.

[0065] Specifically, step S3 includes the following steps:

[0066] 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.

[0067] 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.

[0068] 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 C; if so, the sensor rotates upward and executes step S4; otherwise, the sensor rotates downward and executes step S5.

[0069] In other words, once the sensor detects that the distance in front no longer changes and stabilizes, if the stable value is not greater than the standard distance C, it means that the pot has been put back. It may be the original pot or a taller pot. At this time, the sensor should be rotated upward and step S4 should be executed. Conversely, if the stable value is greater than the standard distance C, it means that the pot has been put back and the new pot is shorter. At this time, the sensor should be rotated downward and step S5 should be executed.

[0070] In this invention, a preset time value is set before executing step S3. Generally, the first preset time value is set to 20 to 100 seconds, depending on the work habits of the staff; the second preset time value is 2 seconds, that is, if the sensing distance remains unchanged within 2 seconds, it is considered that the pot in front is in a stable return state.

[0071] S4: Determine whether the real-time sensing distance in front of the sensor is greater than the standard distance C. If so, the sensor stops rotating and the sensor's real-time angle value is obtained; otherwise, the sensor continues to rotate upward.

[0072] As an optional embodiment of this application, before the sensor rotates 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 C. When the sensor rotates upward, once the distance between the sensor and the pot is greater than the standard distance C, it means that the sensor loses the ability to sense the new pot in front, and at this time the position of the upper edge of the pot is known.

[0073] At this point, the sensor stops rotating upwards and records the current sensing distance value in front of the sensor and the corresponding real-time angle value of the sensor. To be precise, it records the sensing distance value before the moment the sensor lost its sensing and the corresponding real-time angle value of the sensor.

[0074] Of course, if the distance between the sensor and the cookware is never greater than the standard distance C, it means that the edge of the cookware is not detected, and the sensor continues to rotate upward.

[0075] It is important to note that when performing step S4, as the range hood moves upward, it is determined whether the sensor has rotated to the upper limit. If the sensor has rotated to the upper limit, that is, the sensor's orientation is at the maximum angle b0 with the vertical direction, and there is still no sensor loss, then the pot may be too high or the sensor may be faulty, and an alarm should be issued; otherwise, no operation is performed, that is, the sensor continues to rotate upward.

[0076] S5: Determine whether the real-time sensing distance in front of the sensor is not greater than the predetermined distance. If so, the sensor stops rotating and obtains the sensing distance value in front of the sensor and the real-time angle value of the sensor; otherwise, the sensor continues to rotate downward.

[0077] As an optional embodiment of this application, before the sensor rotates downward, there is no pot in front of the sensor (in front of the sensor's sensing direction), and the sensor senses a distance in front that is greater than the standard distance C. When the sensor rotates downward, once the sensor senses a distance in front that is not greater than the predetermined distance, it means that the sensor senses a pot in front, and at this time the position of the upper edge of the pot is known.

[0078] At this point, the sensor stops rotating downwards and records the current sensing distance value in front of the sensor. More precisely, it records the sensing distance value at the instant after the sensor senses the distance in front and the corresponding real-time angle value of the sensor.

[0079] Of course, if the distance between the sensor and the cookware is always greater than the predetermined distance, it means that the edge of the cookware is not detected, and the sensor continues to rotate downwards.

[0080] Here, before executing step S5, a predetermined distance value is generated; wherein, the predetermined distance value is equal to the standard distance C multiplied by a correction factor; since the new cookware is relatively short, the sensor detects the upper edge of the cookware at a real-time distance greater than the standard distance C. Therefore, when executing step S5, the standard distance C cannot be directly used as the standard, but the predetermined distance value is used as the standard. The correction factor is determined according to the load-bearing parameters of the entire stove, and is generally 1.1. That is, once the real-time sensing distance of the sensor is not greater than 1.1 times the standard distance C, it can be considered that the sensor has detected the edge of the cookware in front.

[0081] It should be noted that when performing step S5, when the sensor rotates downward, it is determined whether the sensor has rotated to the lower limit, that is, the sensor has been set to extend vertically downward. If the sensor has rotated to the lower limit and the sensor still does not detect an obstacle, it may be that the pot is too short or the sensor is faulty, and an alarm should be issued; otherwise, no operation is performed, that is, the sensor continues to rotate downward.

[0082] Finally, let's adjust the range hood:

[0083] After obtaining the sensor's forward sensing distance value and the sensor's real-time angle value in step S4, step S6 is executed.

[0084] After obtaining the sensor's forward sensing distance value and the sensor's real-time angle value in step S5, step S6 is executed.

[0085] Step S6: Based on the sensor's forward sensing distance value and the sensor's real-time angle value, the height difference H between the sensor and the horizontal plane of the cookware is calculated. The main controller controls the lifting range hood to rise and fall through the range hood lifter to complete the adjustment of the lifting range hood.

[0086] As an optional embodiment of this application, when performing step S6, the current sensing distance value L in front of the sensor and the real-time angle value b of the sensor are obtained, and the height difference H between the sensor and the horizontal plane of the pot is calculated as L*cos b.

[0087] Furthermore, during step S6, the required adjustment distance S = HM for the lifting range hood is calculated based on the height difference H between the sensor and the horizontal plane of the cookware and the preset optimal suction height value M. If S is positive, the smoke collection chamber of the lifting range hood moves downward; otherwise, if S is negative, the smoke collection chamber of the lifting range hood moves upward. The distance the smoke collection chamber moves is the absolute value of S.

[0088] Furthermore, it determines whether the adjustment distance value S is not less than the preset accuracy value X. If so, the main controller controls the lifting of 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 lifting control; otherwise, no operation is performed.

[0089] Here, the preset accuracy value X is a preset value. If the required adjustment distance value S (which should be the absolute value of S) 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 result in a poor working experience for staff. Conversely, if the required adjustment distance value S (which should be the absolute value of S) is not less than the preset accuracy value X, then the lifting smoke machine needs to be raised or lowered.

[0090] 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. The method then controls the sensor to rotate to obtain the height of the sensor from the new cookware plane after the change, thereby adjusting the distance of the smoke collection chamber. This method is highly intelligent and has high accuracy in identifying cookware changes.

[0091] 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, which is denoted as the standard distance C; The sensor is located on the lower side of the range hood and rotates around the connection point with the range hood. The rotating surface of the sensor is located on the plane formed by three points: the connection point between the sensor and the range hood, the projection of the connection point between the sensor and the range hood onto the stove, and the center of the stove where the pot is placed. S2: Determine whether the sensing distance in front of the sensor has changed and the changed distance value is greater than the standard distance C. If so, proceed to step S3; otherwise, do not perform the operation. S3: When executing step S3, the specific steps include: 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. 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. 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 C; if so, rotate the sensor upward and execute step S4; otherwise, rotate the sensor downward and execute step S5. S4: Determine whether the real-time sensing distance in front of the sensor is greater than the standard distance C. If so, the sensor stops rotating, obtains the current sensing distance value in front of the sensor and the real-time angle value of the sensor corresponding to the sensing distance value, and executes step S6; otherwise, the sensor continues to rotate upward. S5: Determine whether the real-time sensing distance in front of the sensor is not greater than the predetermined distance. If so, the sensor stops rotating, obtains the current sensing distance value in front of the sensor and the real-time angle value of the sensor, and executes step S6; otherwise, the sensor continues to rotate downward. S6: Based on the current sensor distance value and the sensor real-time angle value, the height difference H between the sensor and the horizontal plane of the cookware is calculated. 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. The current sensor forward sensing distance value during step S4 is the sensing distance value before the instant that the sensor forward sensing distance value is greater than the standard distance C.

2. The control method for automatic identification and replacement of cookware by a lifting range hood according to claim 1, characterized in that: If the sensing distance in front of the sensor does not change when performing step S2, or if it changes and the changed distance value is not greater than the standard distance C, then no operation is performed.

3. The control method for automatic identification and replacement of cookware by a lifting range hood according to claim 1, characterized in that: When performing step S1, the upper and lower limits of the sensor's rotation are obtained.

4. The control method for automatic identification and replacement of cookware by a lifting range hood according to claim 3, characterized in that: When performing step S4, if the sensor rotates upward, determine whether the sensor has rotated to the upper limit position. If so, issue an alarm; otherwise, do not perform the operation.

5. The control method for automatic identification and replacement of cookware by a lifting range hood according to claim 3, characterized in that: When performing step S5, if the sensor rotates downwards, determine whether the sensor has rotated to the lower limit. If so, issue an alarm; otherwise, do not perform the operation.

6. The control method for automatic identification and replacement of cookware by a lifting range hood according to claim 1, characterized in that: Before executing step S5, a predetermined distance value is generated; wherein the predetermined distance value is equal to the standard distance C multiplied by a correction factor.

7. The control method for automatically identifying and changing cookware in a lifting range hood according to claim 1, characterized in that: When executing step S6, the current sensing distance value L in front of the sensor and the real-time angle value b of the sensor are obtained, and the height difference H between the sensor and the horizontal plane of the pot is calculated as L*cos b. The current sensor forward sensing distance value L is the sensing distance value before the instant when the sensor forward sensing distance value exceeds the standard distance C.

8. The control method for automatic identification and replacement of cookware by a lifting range hood according to claim 7, characterized in that: When executing step S6, the required adjustment distance S=HM for the range hood is calculated based on the height difference H between the sensor and the horizontal plane of the cookware and the preset optimal suction height value M. It is then determined whether the adjustment distance S 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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