A temperature control system and control method for a range hood

Abstract

The present application relates to the technical field of range hood temperature control, and particularly relates to a range hood temperature control system and a control method, the system comprising an integrated control center, a pre-warning evaluation layer, a range hood control layer, a program management layer, a program evaluation layer and an execution control layer; the present application preliminarily analyzes the control working condition of the range hood to determine whether the control working condition of the range hood is normal, so as to timely manage the range hood, to ensure the stability and reliability of the subsequent control of the range hood, and to intelligently operate and supervise the temperature control of the range hood on the basis of information feedback, to improve the temperature control precision and effectiveness of the range hood, and to provide data support for subsequent analysis during the temperature control supervision process of the range hood, to determine whether the range hood is accurately and effectively controlled during the operation control process through real-time data acquisition and analysis, to timely perform error processing and to avoid the risk of control abnormality.

Description

TECHNICAL FIELD

[0001] The present application relates to the kitchen hood temperature control field, and particularly relates to a kitchen hood temperature control system and a control method. BACKGROUND

[0002] With the advent of the smart home era, people have more diversified and intelligent requirements for household appliances, and the traditional kitchen hood has been difficult to meet the demand for intelligence, so there are many intelligent kitchen hoods on the market. On the basis of retaining the original function of the kitchen hood, the interactive property is increased, and diversified service functions such as recipes and videos can be provided for users.

[0003] However, in the prior art, the temperature of the kitchen hood cannot be accurately controlled, resulting in a large temperature control error of the kitchen hood, and the current control condition of the kitchen hood cannot be supervised, which is not conducive to timely management of the control condition of the kitchen hood, reduces the control efficiency of the kitchen hood, and further has the risk of abnormal control of the kitchen hood.

[0004] In view of the above technical defects, a solution is proposed. SUMMARY

[0005] The purpose of the present application is to provide a kitchen hood temperature control system and a control method to solve the above technical defects. The control condition of the kitchen hood is analyzed to determine whether the control condition of the kitchen hood is normal, so as to timely manage the kitchen hood to ensure the stability and reliability of the subsequent control of the kitchen hood. Based on information feedback, the temperature control of the kitchen hood is intelligently operated and supervised to improve the temperature control precision and effectiveness of the kitchen hood. During the temperature control supervision process of the kitchen hood, the response standard is accurately divided according to the different stages of the kitchen hood to provide data support for subsequent analysis. Through real-time data acquisition and analysis, it is determined whether the kitchen hood is accurately and effectively controlled during the operation control process, so as to timely perform error processing and avoid the risk of abnormal control.

[0006] The purpose of the present application can be realized by the following technical scheme: a kitchen hood temperature control system, comprising an integrated control center, a warning evaluation layer, a kitchen hood control layer, a program management layer, a program evaluation layer and an execution control layer.

[0007] The integrated control center is used to retrieve the control condition information of the kitchen hood, and send the control condition information to the warning evaluation layer for fault risk diagnosis analysis to obtain a stable signal or a risk signal.

[0008] When the stable signal is generated, the range hood control layer is used to collect the ambient temperature value T0 of the environment where the range hood is located, the trigger temperature value T1, and the real-time temperature value T2, and simultaneously perform temperature intelligent control analysis process;

[0009] When the stable signal is generated, the program management layer is used to collect the historical switching information of the range hood, and perform response division analysis on the historical switching information to obtain the gear switching average interval Ai and the data update average interval Bi corresponding to the pre-operation, mid-operation and post-operation, wherein i=1, 2, 3.

[0010] The program evaluation layer is used to perform effectiveness switching control analysis on the collected gear switching duration and data update duration of the range hood at the current time to obtain a response normal signal or a response abnormal signal.

[0011] Preferably, the fault risk diagnosis analysis process is as follows: the power-on period of the range hood is collected and set as a time threshold, the control working condition information of the range hood within the time threshold is obtained, the control working condition information includes a logical correlation index and a state evaluation result, the state evaluation result includes a state evaluation qualified or a state evaluation unqualified, and the logical correlation index and the state evaluation result are subjected to discriminant analysis to obtain a stable signal or a risk signal.

[0012] Preferably, the logical correlation index represents the total number of times that the defective features exist in the historical execution data of the range hood; the state evaluation qualified or unqualified: if the performance characteristics of the mechanical equipment in the range hood are all normal, it is determined that the state evaluation is qualified, and if the performance characteristics of the mechanical equipment in the range hood are not all normal, it is determined that the state evaluation is unqualified.

[0013] Preferably, the temperature intelligent control analysis process is as follows:

[0014] S1: the range hood starts the initialization program, and the range hood startup initialization program is specifically: the ambient temperature value T0 of the environment where the range hood is located within the time threshold is obtained, and the trigger temperature value T1 of the range hood within the time threshold is obtained;

[0015] S2: the real-time temperature value T2 of the range hood within the time threshold is obtained, and when the real-time temperature value T2 of the range hood is greater than the working trigger temperature T1 of the range hood, the range hood enters the medium work;

[0016] S3: after entering the medium work, the real-time temperature value T2 of the range hood is updated every second, and if the real-time temperature value T2 of the range hood is less than (ambient temperature value T0+4℃) within 60 seconds, the temperature control logic after shutdown is entered, and if the real-time temperature value T2 of the range hood is not less than (ambient temperature value T0+4℃) within 60 seconds, an update instruction is generated;

[0017] S4: When the update instruction is generated, the working trigger temperature T1 is updated to the real-time temperature value T2 two minutes ago every two minutes, when the working trigger temperature T1 (the real-time temperature value T2 two minutes ago) > the real-time temperature value T2, the low-grade work is entered, if the working trigger temperature T1 (the real-time temperature value T2 two minutes ago) ≤ the real-time temperature value T2, the middle-grade work is maintained;

[0018] After entering the low-grade work: the working trigger temperature T1 = the real-time temperature value T2 current value, starting 2 minutes timing, when the real-time temperature value T2 - the working trigger temperature T1 (the real-time temperature value T2 two minutes ago) > 2℃, the middle-grade work is entered, when 0 < the real-time temperature value T2 - the working trigger temperature T1 (the real-time temperature value T2 two minutes ago) ≤ 2℃, the low-grade work is maintained, when the real-time temperature value T2 < the working trigger temperature T1 (the real-time temperature value T2 two minutes ago), the temperature control logic after shutdown is entered after 1 minute delay;

[0019] S5: The temperature control logic after shutdown: after 2 minutes delay, if (the real-time temperature value T2 - the working trigger temperature T1) > 2℃, the middle-grade work is entered, if the real-time temperature value T2 ≤ 30℃, S1 is entered, otherwise the shutdown state is maintained.

[0020] Preferably, the response division analysis process is as follows: the historical operation and maintenance times of the normal range hood are obtained, the interval time lengths between each historical operation and maintenance time are obtained, the number of interval time lengths is set as g, g is a natural number greater than zero, the interval time lengths are divided into three sections, which are marked as operation and maintenance early stage, operation and maintenance middle stage and operation and maintenance late stage in turn;

[0021] The historical gear switching time length variation curves and historical data updating time length variation curves corresponding to the operation and maintenance early stage, operation and maintenance middle stage and operation and maintenance late stage of the normal range hood in each interval time length are obtained respectively, and the historical gear switching time length and historical data updating time length corresponding to the operation and maintenance early stage, operation and maintenance middle stage and operation and maintenance late stage are obtained from the historical gear switching time length variation curves and historical data updating time length variation curves.

[0022] Preferably, the mean values of the historical gear switching time length and historical data updating time length corresponding to the operation and maintenance early stage, operation and maintenance middle stage and operation and maintenance late stage are obtained, and are set as gear switching mean value and data updating mean value respectively, and the gear switching mean value set Qg and data updating mean value set Cg corresponding to the operation and maintenance early stage, operation and maintenance middle stage and operation and maintenance late stage are constructed based on the gear switching mean value and data updating mean value.

[0023] The maximum element and minimum element in the gear switching mean value set Qg and data updating mean value set Cg corresponding to the operation and maintenance early stage, operation and maintenance middle stage and operation and maintenance late stage are obtained, and the gear switching mean value interval Ai and data updating mean value interval Bi are constructed based on the maximum element and minimum element.

[0024] Preferably, the historical gear switching duration represents the average duration of the range switching from high to low or from low to medium in the range hood; and the historical data update duration represents the error duration between the collection time and the standard time of the temperature parameter data of the range hood.

[0025] Preferably, the effectiveness switching control analysis process is as follows: obtaining the gear switching average interval Ai and the data update average interval Bi corresponding to the stage in which the range hood is located at the current time within the time threshold, the stage representing the early operation and maintenance, the middle operation and maintenance, and the late operation and maintenance; comparing and analyzing the gear switching duration and the data update duration with the gear switching average interval Ai and the data update average interval Bi to obtain a response normal signal or a response abnormal signal.

[0026] The beneficial effects of the present application are as follows:

[0027] (1) The present application preliminarily analyzes the control working condition of the range hood to determine whether the control working condition of the range hood is normal, so as to timely manage the range hood to ensure the stability and reliability of the subsequent control of the range hood, and intelligently operate and supervise the temperature control of the range hood based on information feedback to improve the temperature control accuracy and effectiveness of the range hood.

[0028] (2) The present application is accompanied by the temperature control supervision process of the range hood, so as to accurately divide the response standard according to the different stages of the range hood to provide data support for subsequent analysis, and to determine whether the range hood is accurately and effectively controlled in the running control process through real-time data collection and analysis to timely perform error processing and avoid the risk of control abnormality. BRIEF DESCRIPTION OF DRAWINGS

[0029] The present application will be further described below with reference to the accompanying drawings;

[0030] Fig. 1 is a system flowchart of the present application;

[0031] Fig. 2 is a local analysis process diagram of the present application;

[0032] Fig. 3 is a method analysis diagram of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0034] Embodiment One:

[0035] Referring to Figs. 1 to 3 The application is a kind of temperature control system of range hood, including integrated control center, early warning evaluation layer, range hood control layer, program management layer, program evaluation layer and execution control layer, integrated control center and early warning evaluation layer are connected in one-way communication, early warning evaluation layer and range hood control layer and execution control layer are connected in one-way communication, range hood control layer and program management layer and program evaluation layer are connected in one-way communication, program management layer and program evaluation layer are connected in one-way communication, program evaluation layer and execution control layer are connected in one-way communication;

[0036] The integrated control center is used to retrieve the control working condition information of the range hood, and send the control working condition information to the early warning evaluation layer for fault risk diagnosis analysis, so as to timely manage the range hood, and ensure the stability and reliability of the next control of the range hood, and the specific fault risk diagnosis analysis process is as follows:

[0037] The power-on period of the range hood is collected and set as a time threshold, the control working condition information of the range hood within the time threshold is obtained, the control working condition information includes a logical correlation index and a state evaluation result, the state evaluation result includes state evaluation qualified or state evaluation unqualified, and the logical correlation index and the state evaluation result are subjected to discriminant analysis:

[0038] If the logical correlation index is less than a preset logical correlation index threshold, and the state evaluation result is state evaluation qualified, a stable signal is generated;

[0039] If the logical correlation index is greater than or equal to the preset logical correlation index threshold, or the state evaluation result is state evaluation qualified, a risk signal is generated, and the stable signal or the risk signal is sent to the execution control layer, after receiving the stable signal or the risk signal, the execution control layer immediately makes a preset early warning operation corresponding to the stable signal or the risk signal, so as to timely manage the range hood, and ensure the stability and reliability of the next control of the range hood;

[0040] The logical correlation index represents the total number of defect features existing in the historical execution data of the range hood, the historical execution data includes start, stop, gear switching, etc., and the defect features include stuttering, delayed response, etc.;

[0041] State evaluation qualified or unqualified: if the performance characteristics of the mechanical equipment in the range hood are all normal, it is determined that the state evaluation is qualified, if the performance characteristics of the mechanical equipment in the range hood are not all normal, it is determined that the state evaluation is unqualified, the mechanical equipment includes fan, sensor, etc., and the performance characteristics include running temperature, abnormal sound value, etc.;

[0042] When the stable signal is generated, the range hood control layer is used for temperature intelligent control analysis on the collected environment temperature value of the environment where the range hood is located and the trigger temperature value, and the specific temperature intelligent control analysis process is as follows:

[0043] S1: The range hood starts the initialization program, and the range hood starting initialization program is specifically: obtaining the environment temperature value T0 of the environment where the range hood is located within a time threshold, and simultaneously obtaining the trigger temperature value T1 of the range hood within the time threshold;

[0044] S2: The real-time temperature value T2 of the range hood within the time threshold is obtained, and when the real-time temperature value T2 of the range hood is greater than the working trigger temperature T1 of the range hood, the range hood enters the middle gear working;

[0045] S3: After entering the middle gear working, the real-time temperature value T2 of the range hood is updated every second, and if the real-time temperature value T2 of the range hood is < (the environment temperature value T0 + 4℃) within 60 seconds, the temperature control logic after shutdown is entered, and if the real-time temperature value T2 of the range hood is not < (the environment temperature value T0 + 4℃) within 60 seconds, an update instruction is generated;

[0046] S4: When the update instruction is generated, the working trigger temperature T1 is updated to the real-time temperature value T2 2 minutes ago every 2 minutes, and when the working trigger temperature T1 (the real-time temperature value T2 2 minutes ago) > the real-time temperature value T2, the low gear working is entered, and if the working trigger temperature T1 (the real-time temperature value T2 2 minutes ago) ≤ the real-time temperature value T2, the middle gear working is maintained;

[0047] After entering the low gear working: the working trigger temperature T1 = the current value of the real-time temperature value T2, and a 2-minute timer is started, when the real-time temperature value T2 - the working trigger temperature T1 (the real-time temperature value T2 2 minutes ago) > 2℃, the middle gear working is entered, when 0 < the real-time temperature value T2 - the working trigger temperature T1 (the real-time temperature value T2 2 minutes ago) ≤ 2℃, the low gear working is maintained, and when the real-time temperature value T2 < the working trigger temperature T1 (the real-time temperature value T2 2 minutes ago), the temperature control logic after shutdown is entered after 1 minute of delay;

[0048] S5: The temperature control logic after shutdown: after 2 minutes of delay, if (the real-time temperature value T2 - the working trigger temperature T1) > 2℃, the middle gear working is entered, if the real-time temperature value T2 ≤ 30℃, S1 is entered, otherwise the shutdown state is maintained, (this logic is mainly to avoid slow stewing to cause shutdown).

[0049] Example two:

[0050] When the stable signal is generated, the program management layer is used to collect the historical switching information of the range hood, and the historical switching information is analyzed in response to the different stages of the range hood to improve the analysis accuracy of the range hood.

[0051] The historical operation and maintenance times of the normal range hood are obtained, the interval durations between the historical operation and maintenance times are obtained, the number of interval durations is set as g, g is a natural number greater than zero, and the interval durations are divided into three sections, which are marked as pre-operation and maintenance, mid-operation and maintenance, and post-operation and maintenance.

[0052] The historical gear switching duration change curves and the historical data updating duration change curves corresponding to the pre-operation and maintenance, the mid-operation and maintenance, and the post-operation and maintenance of the normal range hood in each interval duration are obtained, and the historical gear switching duration and the historical data updating duration corresponding to the pre-operation and maintenance, the mid-operation and maintenance, and the post-operation and maintenance are obtained from the historical gear switching duration change curves and the historical data updating duration change curves.

[0053] The mean values of the historical gear switching duration and the historical data updating duration corresponding to the pre-operation and maintenance, the mid-operation and maintenance, and the post-operation and maintenance are obtained, and they are set as the gear switching mean value and the data updating mean value, respectively, and the gear switching mean value set Qg and the data updating mean value set Cg corresponding to the pre-operation and maintenance, the mid-operation and maintenance, and the post-operation and maintenance are constructed based on the gear switching mean value and the data updating mean value.

[0054] The maximum elements and the minimum elements in the gear switching mean value set Qg and the data updating mean value set Cg corresponding to the pre-operation and maintenance, the mid-operation and maintenance, and the post-operation and maintenance are obtained, and the gear switching mean value interval Ai and the data updating mean value interval Bi are constructed based on the maximum elements and the minimum elements, where i = 1, 2, 3, i.e. when i = 1, it represents the pre-operation and maintenance, when i = 2, it represents the mid-operation and maintenance, and when i = 3, it represents the post-operation and maintenance.

[0055] The historical gear switching duration represents the mean value of the duration between the start time and the complete switching time of the low gear switching or the low gear switching to the medium gear in the range hood.

[0056] The historical data updating duration represents the error duration between the collection time and the standard time of the temperature parameter data of the range hood, and the temperature parameter data includes the ambient temperature value T0, the trigger temperature value T1, and the real-time temperature value T2.

[0057] The program evaluation layer is used to collect the gear switching duration and the data updating duration of the range hood at the current time, and to perform effectiveness switching control analysis to determine whether the range hood is accurately and effectively controlled during the operation control process, so as to timely perform error processing and avoid the risk of control abnormality. The specific effectiveness switching control analysis process is as follows:

[0058] obtaining the gear switching average interval Ai and the data updating average interval Bi corresponding to the stage in which the range hood is located at the current time within the time threshold, wherein the stage represents the early operation and maintenance stage, the middle operation and maintenance stage, and the late operation and maintenance stage;

[0059] comparing and analyzing the gear switching time length and the data updating time length with the gear switching average interval Ai and the data updating average interval Bi;

[0060] if the gear switching time length belongs to the gear switching average interval Ai and the data updating time length belongs to the gear switching average interval Ai, a response normal signal is generated;

[0061] if the gear switching time length does not belong to the gear switching average interval Ai or the data updating time length does not belong to the gear switching average interval Ai, a response abnormal signal is generated, and the response normal signal or the response abnormal signal is sent to the execution control layer, and the execution control layer immediately performs a preset warning operation corresponding to the response normal signal or the response abnormal signal after receiving the response normal signal or the response abnormal signal, so as to timely perform error processing on the range hood and avoid the risk of control abnormality, which helps to improve the temperature control precision and effectiveness of the range hood.

[0062] Embodiment three:

[0063] A range hood temperature control method, comprising the following steps:

[0064] Step one: a fault risk diagnosis analysis process based on a range hood control working condition angle analysis, that is, a fault risk diagnosis analysis is performed on control working condition information to obtain a stable signal or a risk signal;

[0065] Step two: when a stable signal is generated, the range hood starts an initialization program, accompanied by the collection process of the environmental temperature value T0, the trigger temperature value T1 and the real-time temperature value;

[0066] Step three: an intelligent temperature process of the range hood, that is, a temperature intelligent control analysis process of the range hood control layer;

[0067] Step four: collecting historical switching information and accompanied by response division analysis to obtain the gear switching average interval Ai and the data updating average interval Bi;

[0068] Step five: collecting the gear switching time length and the data updating time length of the range hood at the current time, and accompanied by effectiveness switching control analysis, the obtained response normal signal or response abnormal signal is outputted and fed back;

[0069] To sum up, the application preliminarily analyzes the control working condition of the range hood to determine whether the control working condition of the range hood is normal, so as to timely manage the range hood, to ensure the stability and reliability of the subsequent control of the range hood, and intelligently operate and supervise the temperature control of the range hood based on information feedback, to improve the temperature control precision and effectiveness of the range hood, and to accurately divide the response standard according to the different stage performance of the range hood, to provide data support for subsequent analysis, and to determine whether the range hood is accurately and effectively controlled in the operation control process through real-time data acquisition and analysis, to timely perform error processing, and to avoid the risk of control abnormality.

[0070] The size of the threshold is set for comparison, and the size of the threshold depends on the amount of sample data and the base number set by the person skilled in the art for each group of sample data, as long as the proportional relationship between the parameter and the quantized value is not affected.

[0071] The above is only a preferred specific embodiment of the application, but the protection scope of the application is not limited thereto, any person skilled in the art can make equivalent replacement or change within the technical range disclosed by the application according to the technical solution and the inventive concept of the application, which should be covered within the protection scope of the application.

Claims

1. A temperature control system for a range hood, the system comprising: The integrated control center, the early warning evaluation layer, the range hood control layer, the program management layer, the program evaluation layer and the execution control layer are included. The integrated control center is used for calling control working condition information of the range hood, and sending the control working condition information to the early warning evaluation layer for fault risk diagnosis analysis, to obtain a stable signal or a risk signal. When the stable signal is generated, the range hood control layer is used for collecting an ambient temperature value T0 of an environment where the range hood is located, a trigger temperature value T1 and a real-time temperature value T2, and simultaneously performing temperature intelligent control analysis. When the stable signal is generated, the program management layer is used for collecting historical switching information of the range hood, and performing response division analysis on the historical switching information, to obtain gear switching average interval Ai and data update average interval Bi corresponding to a pre-operation period, a mid-operation period and a post-operation period, wherein i = 1, 2, 3. The program evaluation layer is used for performing effectiveness switching control analysis on collected gear switching duration and data update duration of the range hood at a current time, to obtain a response normal signal or a response abnormal signal. The response division analysis process is as follows: obtaining a historical operation number of a normal range hood, obtaining interval durations between each historical operation number, setting a number of the interval durations as g, g being a natural number greater than zero, dividing the interval durations into three segments, and sequentially marking as a pre-operation period, a mid-operation period and a post-operation period. Respectively obtaining historical gear switching duration variation curves and historical data update duration variation curves corresponding to the pre-operation period, the mid-operation period and the post-operation period of the normal range hood in each interval duration, and obtaining historical gear switching duration and historical data update duration corresponding to the pre-operation period, the mid-operation period and the post-operation period from the historical gear switching duration variation curves and the historical data update duration variation curves. Obtaining means of the historical gear switching duration and the historical data update duration corresponding to the pre-operation period, the mid-operation period and the post-operation period, and setting the means as gear switching mean value and data update mean value respectively, and constructing gear switching mean value set Qg and data update mean value set Cg corresponding to the pre-operation period, the mid-operation period and the post-operation period based on the gear switching mean value and the data update mean value. Obtaining maximum elements and minimum elements in the gear switching mean value set Qg and the data update mean value set Cg corresponding to the pre-operation period, the mid-operation period and the post-operation period, and constructing gear switching mean value interval Ai and data update mean value interval Bi based on the maximum elements and the minimum elements.

2. A temperature control system for a range hood as defined in claim 1, wherein The fault risk diagnosis analysis process is as follows: collecting a power-on period of the range hood, and setting the power-on period as a time threshold, obtaining control working condition information of the range hood within the time threshold, the control working condition information including a logical correlation index and a state evaluation result, the state evaluation result including a state evaluation pass or a state evaluation fail, performing discriminant analysis on the logical correlation index and the state evaluation result, to obtain a stable signal or a risk signal.

3. A temperature control system for a range hood as defined in claim 2, wherein The logical correlation index represents the total number of times that the defect feature exists in the historical execution data of the range hood; the state evaluation is qualified or unqualified: if the performance features of the mechanical equipment in the range hood are all normal, the state evaluation is qualified, and if the performance features of the mechanical equipment in the range hood are not all normal, the state evaluation is unqualified.

4. The temperature control system for a range hood according to claim 1, wherein The intelligent temperature control analysis process is as follows: S1: The range hood starts the initialization program, and the range hood startup initialization program specifically is: obtaining the environment temperature value T0 of the environment where the range hood is located within a time threshold, and simultaneously obtaining the trigger temperature value T1 of the range hood within the time threshold; S2: Obtain the real-time temperature value T2 of the range hood within the time threshold, when the real-time temperature value T2 of the range hood is greater than the working trigger temperature T1 of the range hood, the range hood enters the middle gear working; S3: After entering the middle gear working, the real-time temperature value T2 of the range hood is updated every second, if the real-time temperature value T2 of the range hood is less than (environment temperature value T0+4℃) within 60 seconds, the temperature control logic after shutdown is entered, if the real-time temperature value T2 of the range hood is not less than (environment temperature value T0+4℃) within 60 seconds, an update instruction is generated; S4: When the update instruction is generated, the working trigger temperature T1 is updated to the real-time temperature value T2 2 minutes ago every 2 minutes, when the working trigger temperature T1 is greater than the real-time temperature value T2, the low gear working is entered, if the working trigger temperature T1 is less than or equal to the real-time temperature value T2, the middle gear working is maintained; After entering the low gear working: the working trigger temperature T1 is equal to the current value of the real-time temperature value T2, starting 2 minutes of timing, when the real-time temperature value T2 minus the working trigger temperature T1 is greater than 2℃, the middle gear working is entered, when 0 is less than the real-time temperature value T2 minus the working trigger temperature T1 and is less than or equal to 2℃, the low gear working is maintained, when the real-time temperature value T2 is less than the working trigger temperature T1, the temperature control logic after shutdown is entered after 1 minute of delay; S5: The temperature control logic after shutdown: after 2 minutes of delay, if (real-time temperature value T2 minus working trigger temperature T1) is greater than 2℃, the middle gear working is entered, if the real-time temperature value T2 is less than or equal to 30℃, S1 is entered, otherwise the shutdown state is maintained.

5. The temperature control system for a range hood as set forth in claim 1, wherein The historical gear switching duration represents the average duration between the starting time and the complete switching time when the range hood switches from the middle gear to the low gear or from the low gear to the middle gear; the historical data update duration represents the error duration between the collection time and the standard time of the temperature parameter data of the range hood.

6. The temperature control system for a range hood according to claim 1, wherein The effectiveness switching control analysis process is as follows: obtaining the gear switching average interval Ai and the data update average interval Bi corresponding to the stage where the range hood is located within a time threshold, the stage represents the early operation and maintenance, the middle operation and maintenance, and the late operation and maintenance, comparing and analyzing the gear switching duration and the data update duration with the gear switching average interval Ai and the data update average interval Bi, to obtain a response normal signal or a response abnormal signal.

7. A method for controlling temperature of a range hood, the method being applied to a system for controlling temperature of a range hood according to any one of claims 1-6, characterized in that, The following steps are included: Step one: the fault risk diagnosis analysis process based on the range hood control working condition angle analysis; Step two: when the stable signal is generated, the range hood starts the initialization program, accompanied by the collection process of the ambient temperature value T0, the trigger temperature value T1 and the real-time temperature value; Step three: the intelligent temperature process of the range hood, that is, the temperature intelligent control analysis process of the range hood control layer; Step four: collect the historical switching information and accompany the response division analysis to obtain the gear switching average interval Ai and the data update average interval Bi; Step five: collect the gear switching time length and the data update time length of the range hood at the current time, and accompany the effectiveness switching control analysis to output the response normal signal or the response abnormal signal feedback.

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