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

Abstract

The application provides a control method for automatic identification and replacement of a pot by a lifting range hood, and relates to the technical field of lifting range hoods, and comprises the following steps: S1: acquiring the distance of the pot in front of a sensor; S2: if the distance sensed by the sensor is greater than A, S3 is executed; S3: determining whether the distance sensed by the sensor is less than A within a predetermined time, if yes, the telescopic rod is retracted, otherwise, the telescopic rod is extended; S4: determining whether the distance sensed by the sensor is greater than A, if yes, the telescopic rod is stopped, and the displacement distance of the telescopic rod is recorded; S5: determining whether the distance sensed by the sensor is less than A, if yes, the telescopic rod is stopped, and the displacement distance of the telescopic rod is recorded; and S6: controlling the lifting of the lifting range hood. The application judges the pot replacement operation of a user by detecting the distance change of a sensor, compares the distance value after the pot replacement with a preset standard value to judge the height of the new pot replaced by the user, adjusts the distance of the smoke collection cavity according to the height of the sensor to the plane of the new pot, and has high intelligence and 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 cookware of a liftable range hood, which judges the user's cookware replacement operation by detecting the distance change of the sensor, compares the distance value after replacing the cookware with the preset standard value to judge the height of the new cookware replaced by the user, and controls the telescopic structure to rise or fall to obtain the height of the sensor to the plane of the new cookware after replacing the cookware, so as to adjust the distance of the smoke collection cavity, which is intelligent and has high recognition accuracy for replacing cookware.

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

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

[0009] S1: The main controller obtains the real-time distance between the front of the sensor and the cookware;

[0010] S2: It is judged whether the real-time distance between the front of the sensor and the cookware is greater than the standard distance A between the sensor and the center of the cooktop, if yes, step S3 is executed; otherwise, no operation is performed;

[0011] S3: It is judged whether the real-time distance between the front of the sensor and the cookware is less than the standard distance A within a predetermined time, if yes, the telescopic rod is retracted, and step S4 is executed; otherwise, the telescopic rod is extended downward, and step S5 is executed;

[0012] S4: It is judged whether the real-time distance between the front of the sensor and the cookware is greater than the standard distance A, if yes, the telescopic rod is stopped, the displacement distance S1 of the telescopic rod is recorded, and step S6 is executed; otherwise, the telescopic rod continues to retract;

[0013] S5: It is judged whether the real-time distance between the front of the sensor and the cookware is less than the standard distance A, if yes, the telescopic rod is stopped, the displacement distance S2 of the telescopic rod is recorded, and step S6 is executed; otherwise, the telescopic rod continues to extend downward;

[0014] S6: Based on the displacement distance value of the telescopic rod, the main controller controls the liftable range hood to lift or lower through the range hood lifter, and completes the adjustment of the liftable range hood.

[0015] As a preferred embodiment of the present application, when step S1 is executed, the main controller obtains the real-time distance between the front of the sensor and the cookware after the liftable range hood starts to enter the normal working state.

[0016] As a preferred embodiment of the present application, the main controller records the real-time distance between the sensor and the current cookware, judges whether the real-time distance is not greater than the standard distance A, if yes, step S2 is executed; otherwise, an alarm is given.

[0017] As a preferred embodiment of the present application, when step S1 is executed, the main controller obtains the distance between the front of the sensor and the cookware before obtaining the standard distance A and recording.

[0018] As a preferred embodiment of the present application, a predetermined time value is preset before step S3 is performed.

[0019] As a preferred embodiment of the present application, when step S5 is performed, the real-time sensor height is obtained when the telescopic rod is extended downward, and it is determined whether the real-time sensor height is not lower than the height of the cooking head. If yes, the telescopic rod continues to move downward. If not, an alarm is issued.

[0020] As a preferred embodiment of the present application, when step S4 is performed, the telescopic rod displacement distance S1 is a positive movement of the telescopic rod.

[0021] When step S5 is performed, the telescopic rod displacement distance S2 is a negative movement of the telescopic rod.

[0022] As a preferred embodiment of the present application, when step S6 is performed, the telescopic rod displacement distance value is an absolute value of the telescopic rod displacement distance.

[0023] As a preferred embodiment of the present application, when step S6 is performed, it is determined whether the telescopic rod displacement distance value is not less than a preset precision value X. If yes, the main controller controls the range hood lifter to lift the range hood to complete the range hood control. If not, the range hood lifting adjustment is not performed, and the process returns to step S1.

[0024] As a preferred embodiment of the present application, when step S6 is performed, when the range hood is adjusted downward, it is determined in real time whether the range hood is adjusted to the lowest position. If yes, the adjustment is stopped. If not, the range hood continues to be adjusted downward until the telescopic rod displacement distance value.

[0025] The control method for automatically identifying replacement of a pot by a range hood has the advantages that the distance change detected by the sensor is used to determine the user's pot replacement operation, the distance value after the pot is replaced is compared with a preset standard value to determine the height of the new pot, the telescopic structure is controlled to ascend or descend to obtain the height of the sensor to the plane of the new pot after the pot is replaced, and the distance of the smoke collection cavity is adjusted, so that the control method is intelligent and has high accuracy in identification of replacement of a pot. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Fig. 1 FIG. 1 is a control flow diagram of an embodiment of the control method for automatically identifying replacement of a pot by a range hood.

[0028] Fig. 2It is a side view of the lifting range hood control structure of the control method for automatically identifying and replacing the pot of the lifting range hood according to the present application;

[0029] Fig. 3 It is a top view of the lifting range hood control structure of the control method for automatically identifying and replacing the pot of the lifting range hood according to the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application.

[0031] In the following description, the terms "first", "second", etc. are only for the purpose of description and cannot be understood as indicating or implying relative importance. The following description provides a plurality of embodiments of the present application, and different embodiments can be replaced or combined, so the present application can also be considered to include all possible combinations of the same and / or different embodiments described. Therefore, if one embodiment includes features A, B and C, and another embodiment includes features B and D, the present application should also be considered to include an embodiment including one or more all other possible combinations of A, B, C and D, although this embodiment can not be explicitly described in the following content.

[0032] The following description provides examples and does not limit the scope, applicability or examples set forth in the claims. Changes can be made to the functions and arrangements of the described elements without departing from the scope of the present application. Various processes or components can be appropriately omitted, replaced or added in each example. For example, the described methods can be performed in different order from the described order, and various steps can be added, omitted or combined. In addition, features described with respect to some examples can be combined into other examples.

[0033] Embodiment: refer to Figs. 1 to 3 The control method for automatically identifying and replacing the pot of the lifting range hood according to the present application is suitable for the lifting range hood control structure, which includes: a stove head, a lifting range hood arranged behind the stove head, an extension rod arranged at the lower side of the lifting range hood, and a sensor arranged at the lower end of the extension rod, the sensor is arranged towards the stove head, the lifting range hood is provided with a main controller for electrically connecting with the sensor and a range hood lifter electrically connected with the main controller.

[0034] In the present application, the stove head is arranged on the cooking bench for placing the pot, and the direction in which the worker stands is regarded as the front, then the lifting range hood is arranged at the upper side behind the stove head, the lifting range hood can be lifted up and down, and can be extended to the rear of the pot when descending to suck the steam and oil fume of the pot.

[0035] The lower side of the lifting range hood is provided with a telescopic rod extending downward, and the lower end of the telescopic rod is provided with a sensor, which is preferably an infrared distance meter and is arranged to face forward, that is, the sensor can measure the distance of the obstacle in front, which is generally used to measure the distance of the pot arranged on the stove head in front.

[0036] In addition, a main controller is arranged in the lifting range hood and is electrically connected with the sensor, so that the sensor obtains the distance of the obstacle in front (hereinafter referred to as the sensor distance or the sensor front distance) and then sends it to the main controller.

[0037] The lifting range hood is also provided with a range hood lifter electrically connected with the main controller, that is, the main controller controls the lifting of the lifting range hood through the range hood lifter.

[0038] Of course, the telescopic rod is also electrically connected with the main controller, and the telescopic rod can be extended downward or retracted upward, and the telescopic distance of the telescopic rod is also sent to the main controller.

[0039] The method comprises the following steps:

[0040] S1: The main controller obtains the real-time distance between the sensor front and the pot, and records the distance between the sensor and the current pot as a mark distance L.

[0041] As an option of the embodiment of the application, the main controller obtains the distance between the sensor front and the pot under a premise, that is, after the height of the smoke collecting cavity of the lifting range hood is adjusted after starting, that is, after the lifting range hood enters the normal working state, the main controller obtains the real-time distance between the sensor front and the pot.

[0042] When the lifting range hood is started, the lifting range hood is manually started, and then the lifting range hood is adjusted by the function button control or automatic lowering of the lifting range hood, until the height of the smoke collecting cavity of the lifting range hood corresponds to the pot on the current stove head, that is, after the height adjustment of the smoke collecting cavity is completed, the main controller obtains the distance between the sensor front and the pot.

[0043] Generally, when step S1 is performed, after the main controller records the initial distance between the sensor and the current pot as a mark distance L, it is judged whether the mark distance L is less than a standard distance A, if yes, step S2 is performed, otherwise, an alarm is given.

[0044] Here, the standard distance A is the horizontal distance between the sensor and the center of the stove head, and the value A is a preset value which is sent to the main controller when the lifting range hood is installed, or in other words, before the main controller obtains the distance between the sensor front and the pot, the main controller obtains the standard distance A and records it when step S1 is performed.

[0045] Generally, the standard distance A is set before the equipment is shipped, which can be the horizontal distance from the sensor to the center of the cooking zone. Since the size of the cooking zone in a user's home is usually within the range of standard size 50-60 cm, this data can also be obtained by multiple simulation tests to get the best matching value, that is, the sensor is lowered and the telescopic rod is extended downward until the sensor is at the same height as the cooking zone, and the distance between the sensor and the edge of the cooking zone is measured, and then 25-30 cm is added to obtain the value of the standard distance A.

[0046] Then, the main controller records the distance between the sensor and the current pot as the marked distance L. If the marked distance L is less than the standard distance A, it can be considered that there is a pot on the cooking zone.

[0047] The sensor continuously obtains the real-time distance between the front of the sensor and the pot and transmits the distance data to the main controller.

[0048] S2: Determine whether the real-time distance between the front of the sensor and the pot is greater than the standard distance A from the sensor to the center of the cooking zone. If yes, execute step S3; otherwise, do not execute step S3.

[0049] As an option of the embodiment of the present application, during the cooking process of the kitchen staff, the pot will inevitably be touched, at which time the real-time distance in front of the sensor will change. If the real-time distance is not greater than the standard distance A, it indicates that this is a scenario of the staff stirring the pot during cooking. Conversely, if the real-time distance is greater than the standard distance A, it can be considered that the staff has taken away the current pot, and further judgment needs to be performed, i.e., step S3 is executed.

[0050] S3: Determine whether the real-time distance between the front of the sensor and the pot is less than the standard distance A within a predetermined time. If yes, the telescopic rod is retracted, and step S4 is executed. Conversely, the telescopic rod is extended downward, and step S5 is executed.

[0051] As an option of the embodiment of the present application, after the pot is taken away, if the cooking operation is not stopped and the pot is placed back on the cooking zone again, when the pot is taken away, if the real-time distance between the front of the sensor and the pot is less than the standard distance A within a predetermined time, it indicates that the pot has been placed back on the cooking zone. Conversely, the pot has not been placed back, or the pot has not been sensed.

[0052] It should be noted that taking away the pot generally means pouring out the dishes, washing the pot, or replacing the pot. The first two cases can be understood as not replacing the pot, and the latter case is replacing the pot.

[0053] If the pot is not replaced, it indicates that the real-time distance between the front of the sensor and the pot is the marked distance L, which is still less than A, and it can be considered that the pot has been placed back.

[0054] If the pot has been replaced, it is divided into two cases, the new pot is replaced by a higher one or the new pot is replaced by a lower one. If the new pot is higher, the real-time distance between the sensor and the pot in front of the sensor is still less than the standard distance A. If the new pot is lower, the real-time distance between the sensor and the pot in front of the sensor is greater than the standard distance A.

[0055] Here, if the lower pot is put back, as long as the pot passes in front of the sensor, the sensor will still sense the change of the distance value. After the change, the sensor sensing distance is still greater than the standard distance A after the lower pot is placed on the stove top.

[0056] In summary, if the real-time distance between the sensor and the pot in front of the sensor changes within a predetermined time, it means that the pot has been put back. If the real-time distance between the sensor and the pot in front of the sensor does not change within a predetermined time, it means that the pot has not been put back.

[0057] In fact, step S3 should be: judging whether the real-time distance between the sensor and the pot in front of the sensor changes within a predetermined time and the stable value after the change is less than the standard distance A,

[0058] When the real-time distance between the sensor and the pot in front of the sensor changes within a predetermined time and the stable value after the change is less than the standard distance A, it means that the pot has been put back. It can be the original pot or a higher pot. At this time, the telescopic rod should be retracted and step S4 should be executed.

[0059] On the contrary, when the real-time distance between the sensor and the pot in front of the sensor changes within a predetermined time and the stable value after the change is not less than the standard distance A, it means that the pot has been put back and the new pot is lower. At this time, the telescopic rod should be extended downward and step S5 should be executed.

[0060] In the present application, a predetermined time value is preset before step S3 is executed. It is generally set to 20-100 seconds and is set according to the working habits of the staff.

[0061] S4: judging whether the real-time distance between the sensor and the pot in front of the sensor is greater than the standard distance A. If yes, the telescopic rod stops and the displacement distance S1 of the telescopic rod is recorded. Step S6 is executed. If not, the telescopic rod continues to retract.

[0062] As an option of the embodiment of the present application, before the telescopic rod retracts, there is a pot in front of the sensor and the distance between the sensor and the pot is less than the standard distance A. When the telescopic rod retracts, if the distance between the sensor and the pot is greater than the standard distance A, it means that the height of the sensor is higher than the height of the upper edge of the pot. At this time, the height of the upper edge of the pot is known.

[0063] At this time, the telescopic rod stops retracting and the displacement distance S1 of the telescopic rod is recorded. That is, the current height of the sensor is known. The height value is the height of the upper edge of the pot.

[0064] Of course, if the distance between the sensor and the pot is always not greater than the standard distance A, it means that the pot edge is not sensed, and the telescopic rod continues to retract;

[0065] It should be noted that if the telescopic rod is retracted to the minimum value and the sensor still does not sense the pot edge, the lifting range hood can be raised, or an acoustic and light prompt can be given to sense the abnormality.

[0066] S5: Determine whether the real-time distance between the front of the sensor and the pot is less than the standard distance A. If yes, the telescopic rod stops, the telescopic rod displacement distance S2 is recorded, and step S6 is performed. Otherwise, the telescopic rod continues to extend downward.

[0067] As an option of the embodiment of the present application, before the telescopic rod extends downward, the front of the sensor is not the pot, the sensor senses that the front distance is greater than the standard distance A, and when the telescopic rod extends downward, once the sensor senses that the front distance is less than the standard distance A, it means that the sensor senses that there is a pot in front, and the height of the sensor is lower than the height of the pot edge. At this time, the height of the upper end edge of the new pot is known.

[0068] At this time, the telescopic rod stops extending downward, and the telescopic rod displacement distance S2 is recorded, that is, the current height of the sensor is known, and the height value is the height of the upper end edge of the pot.

[0069] Of course, if the distance between the sensor and the pot is always not less than the standard distance A, it means that the pot edge is not sensed, and the telescopic rod continues to extend downward.

[0070] It should be noted that if the telescopic rod is retracted to the maximum value and the sensor still does not sense the pot edge, the lifting range hood can be lowered, or an acoustic and light prompt can be given to sense the abnormality.

[0071] Moreover, when step S5 is performed, the height of the sensor is acquired in real time when the telescopic rod extends downward, it is determined whether the real-time height of the sensor is not lower than the height of the cooktop, if yes, the telescopic rod continues to displace downward, otherwise, an alarm is given.

[0072] That is, once the telescopic rod extends downward to the height of the cooktop and no pot is sensed before the telescopic rod reaches the height, the telescopic rod should not continue to extend downward, and an alarm is given to prompt that no pot is put in.

[0073] It should be noted that when step S4 is performed, the telescopic rod displacement distance S1 is a positive value, that is, the telescopic rod displacement is a positive motion.

[0074] When step S5 is performed, the telescopic rod displacement distance S2 is a negative value, that is, the telescopic rod displacement is a negative motion.

[0075] Alternatively, when step S4 is executed, the telescopic rod displacement distance S1 is negative, i.e. the telescopic rod displacement is negative movement;

[0076] When step S5 is executed, the telescopic rod displacement distance S2 is positive, i.e. the telescopic rod displacement is positive movement.

[0077] In summary, the positive and negative signs are used to record the direction of the telescopic rod displacement, so as to know the height value of the current telescopic rod.

[0078] S6: Based on the telescopic rod displacement distance value, the main controller controls the lifting of the smoke machine through the smoke machine lifter to complete the lifting adjustment of the smoke machine.

[0079] As an option of the embodiment of the present application, when step S6 is executed, the telescopic rod displacement distance value is the absolute value of the telescopic rod displacement distance, but the direction of the lifting adjustment of the smoke machine is determined according to the positive and negative signs of the telescopic rod displacement distance.

[0080] Further, when step S6 is executed, it is judged whether the telescopic rod displacement distance value is not less than a preset precision value X, if yes, the main controller controls the lifting of the smoke machine through the smoke machine lifter to complete the lifting adjustment of the smoke machine; otherwise, the lifting adjustment of the smoke machine is not executed, and the step S1 is returned.

[0081] Here, the preset precision value X is a preset value, if the telescopic rod displacement distance value is less than the preset precision value X, it is considered that the height difference between the new pot and the original pot is not large, the lifting of the smoke machine has little effect on the height adjustment of the smoke collection cavity, and the evaluation can not be adjusted, which can prevent the smoke collection cavity from frequently moving the height and the staff from having a poor perception; otherwise, if the telescopic rod displacement distance value is not less than the preset precision value X, the lifting of the smoke machine is needed.

[0082] It should be noted that if the pot put back is the original pot, when step S4 is executed, the telescopic rod is stopped from retracting after being upwardly displaced by a small value, the absolute value of S1 is small, and the absolute value is less than the preset precision value X, so the lifting of the smoke machine is not needed.

[0083] In addition, when step S6 is executed, when the lifting of the smoke machine is adjusted downward, it is judged in real time whether the lifting of the smoke machine is adjusted to the lowest position, if yes, it is indicated that the lifting of the smoke machine has reached the lower limit position and cannot continue to be lowered, at this time the adjustment should be stopped; otherwise, the lifting of the smoke machine continues to be adjusted downward until the telescopic rod displacement distance value.

[0084] The application discloses a control method for automatically identifying and replacing a pot of a lifting range hood. The distance change is detected by a sensor to determine the user's pot replacing operation. The height of the new pot is determined by comparing the distance value after the pot is replaced with a preset standard value. The telescopic structure is controlled to ascend or descend to obtain the height of the sensor to the plane of the new pot after the pot is replaced, so that the distance of the smoke collecting cavity is adjusted. The application is intelligent and has high recognition accuracy for the pot replacement.

[0085] The above description is only exemplary embodiments of the present disclosure, and cannot limit the scope of the present disclosure. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. Those skilled in the art will easily think of embodiments of the present disclosure after considering the specification and practicing the disclosure herein. The present application is intended to cover any variations, uses, or adaptive changes of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not described in the present disclosure. The specification and examples are only considered as exemplary, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. A control method for automatically recognizing replacement of a pot by a lifting hood, characterized by, The method comprises the following steps: S1: the main controller obtains the distance between the sensor and the pot in front of the sensor; The lower side of the lifting range hood is provided with a telescopic rod extending downward, and the lower end of the telescopic rod is provided with a sensor facing forward to measure the distance of the pot provided on the cooking head in front of the sensor; S2: determine whether the real-time distance between the sensor and the pot in front of the sensor is greater than the standard distance A between the sensor and the center of the cooking head, if yes, execute step S3; otherwise, do not execute the operation; The standard distance A is the horizontal distance between the sensor and the center of the cooking head; S3: determine whether the real-time distance between the sensor and the pot in front of the sensor is less than the standard distance A within a predetermined time, if yes, the telescopic rod is retracted, and step S4 is executed; otherwise, the telescopic rod extends downward, and step S5 is executed; S4: determine whether the real-time distance between the sensor and the pot in front of the sensor is greater than the standard distance A, if yes, the telescopic rod stops, records the displacement distance S1 of the telescopic rod, and executes step S6; otherwise, the telescopic rod continues to retract; S5: determine whether the real-time distance between the sensor and the pot in front of the sensor is less than the standard distance A, if yes, the telescopic rod stops, records the displacement distance S2 of the telescopic rod, and executes step S6; otherwise, the telescopic rod continues to extend downward; S6: based on the displacement distance value of the telescopic rod, the main controller controls the lifting range hood to lift through the range hood lifter, and completes the adjustment of the lifting range hood.

2. The control method of claim 1, wherein when step S1 is executed, after the height of the smoke collection cavity is adjusted when the lifting range hood is started, and after the lifting range hood is ensured to work normally, the main controller obtains the distance between the sensor and the pot in front of the sensor.

3. The control method of claim 1, wherein when step S1 is executed, the main controller records the distance between the sensor and the current pot as a mark distance L, and then determines whether the mark distance L is less than the standard distance A, if yes, step S2 is executed; otherwise, an alarm is given.

4. The control method of claim 3, wherein when step S1 is executed, the main controller obtains the standard distance A and records it before obtaining the distance between the sensor and the pot in front of the sensor.

5. The control method of claim 1, wherein before step S3 is executed, a predetermined time value is preset.

6. The control method of claim 1, wherein when step S5 is executed, when the telescopic rod extends downward, the height of the sensor is obtained in real time, and it is determined whether the real-time height of the sensor is not lower than the height of the cooking head, if yes, the telescopic rod continues to move downward; otherwise, an alarm is given.

7. The control method of claim 1, wherein when step S4 is executed, the displacement distance S1 of the telescopic rod is a positive motion of the telescopic rod; When step S5 is executed, the displacement distance S2 of the telescopic rod is a negative motion of the telescopic rod.

8. The control method of claim 7, wherein ​ ​ ​ ​ ​ ​ The telescopic rod displacement distance value is an absolute value of the telescopic rod displacement distance.

9. The control method of claim 1, wherein the control method further comprises: determining whether the telescopic rod displacement distance value is greater than or equal to a preset precision value X; and if yes, controlling the lifting range hood to be lifted by the lifting range hood controller, and if not, returning to step S1.

10. The control method of claim 1, wherein the control method further comprises: determining whether the lifting range hood is adjusted to the lowest position when the lifting range hood is adjusted downward, and if yes, stopping the adjustment, and if not, continuing to adjust the lifting range hood downward until the telescopic rod displacement distance value is obtained. ​ ​

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