Control method of extractor hood, extractor hood and storage medium

Abstract

The invention discloses a control method of an extractor hood, the extractor hood and a storage medium, and relates to the technical field of control. According to the current temperature data and historical temperature data continuous with the current moment, the continuous change trend of the temperature is determined; the continuous change trend of the temperature can reflect the change direction and stability of the temperature along with time, namely, the dynamic change condition of the temperature can be reflected, and the use state of the cooker is determined according to the continuous change trend instead of judging the use state of the cooker according to an instantaneous temperature value; therefore, misjudgment on the real cooking state caused by temperature data breakpoint or jump due to kitchen environment temperature change, other interference factors and the like is avoided, and then the range hood is effectively controlled to be turned on and turned off according to the use state of the kitchen range. Therefore, the range hood can be effectively controlled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of control, in particular to a control method of a range hood, a range hood and a storage medium. BACKGROUND

[0002] At present, the start of the range hood is triggered by judging whether the temperature of the cooking area is greater than a fixed threshold, or the stop of the range hood is triggered by judging whether the temperature of the cooking area is less than a fixed threshold.

[0003] However, this way will cause temperature data breakpoints or jumps due to changes in kitchen environment temperature, other interference factors, etc., resulting in false judgment of the real cooking state, and leading to difficulty in achieving effective control of the range hood. SUMMARY

[0004] The main purpose of the present application is to provide a control method of a range hood, a range hood and a storage medium, aiming at solving the technical problem of difficulty in achieving effective control of the range hood.

[0005] To achieve the above-mentioned purpose, the present application provides a control method of a range hood, which comprises: obtaining current temperature data of a cooking area; determining a sustained change trend of the temperature according to the current temperature data and historical temperature data continuous with the current time; determining a use state of a gas stove according to the sustained change trend; controlling the start and stop of the range hood according to the use state of the gas stove.

[0006] In an embodiment, the use state of the gas stove includes an off state, and the step of determining the use state of the gas stove according to the sustained change trend comprises: determining a current scene according to the sustained change trend, wherein the current scene includes off after cooking and off immediately after ignition; when the current scene is off after cooking or off immediately after ignition, the use state of the gas stove is determined as the off state.

[0007] In an embodiment, the sustained change trend includes a sustained downward trend and a sustained stability near an initial environment temperature, and the step of determining the current scene according to the sustained change trend comprises: when the sustained change trend is the sustained downward trend, the current scene is determined as off after cooking; when the sustained change trend is the sustained stability near the initial environment temperature, the current scene is determined as off immediately after ignition.

[0008] In an embodiment, the continuous change trend comprises a continuous decreasing trend, and the step of determining the continuous change trend of the temperature according to the current temperature data and the historical temperature data comprises: calculating a window average change rate of temperature data in a preset first time period continuous to the current time according to the current temperature data and the historical temperature data; judging whether the window average change rate meets a temperature decreasing judgment condition; if yes, accumulating a temperature decreasing number once; when the temperature decreasing number accumulation reaches a preset first number, determining that the continuous change trend of the temperature is a continuous decreasing trend.

[0009] In an embodiment, the continuous change trend further comprises a continuous stabilization around an initial ambient temperature, and the step of determining the continuous change trend of the temperature according to the current temperature data and the historical temperature data comprises: calculating a window average temperature in a preset second time period continuous to the current time according to the current temperature data and the historical temperature data; judging whether a difference between the window average temperature and the initial ambient temperature is less than a first difference threshold; if yes, accumulating a continuous duration; when the continuous duration accumulation reaches a preset duration threshold, determining that the continuous change trend is a continuous stabilization around the initial ambient temperature.

[0010] In an embodiment, the continuous change trend further comprises a continuous increasing trend, and the step of determining the continuous change trend of the temperature according to the current temperature data and the historical temperature data comprises: calculating a moving average change rate of temperature data in a preset third time period continuous to the current time according to the current temperature data and the historical temperature data; judging whether the moving average change rate meets a temperature increasing judgment condition; if yes, accumulating a temperature increasing number once; when the temperature increasing number accumulation reaches a preset second number, determining that the continuous change trend of the temperature is a continuous increasing trend.

[0011] In an embodiment, the stove usage state further comprises a fire-on state, and the step of determining the stove usage state according to the continuous change trend comprises: when the continuous change trend is a continuous increasing trend, and a difference between the current temperature of the cooking area and the initial ambient temperature is greater than or equal to a second difference threshold, determining that the stove usage state is a fire-on state.

[0012] In an embodiment, the state of the stove includes a fire-on state and a fire-off state, and the step of controlling the opening and closing of the range hood according to the state of the stove includes: when the state of the stove is the fire-on state, automatically starting the fan of the range hood; when the state of the stove is the fire-off state, automatically stopping the fan of the range hood.

[0013] In addition, to achieve the above-mentioned purpose, the present application also proposes a range hood, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the control method of the range hood as described above.

[0014] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer readable storage medium, and the storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the control method of the range hood as described above.

[0015] The one or more technical solutions proposed by the present application have at least the following technical effects: The present application obtains current temperature data of the cooking area, determines a sustained change trend of the temperature according to the current temperature data and historical temperature data continuous with the current time, determines the state of the stove according to the sustained change trend, and controls the opening and closing of the range hood according to the state of the stove. It can be understood that the sustained change trend of the temperature can reflect the change direction and stability of the temperature with time, that is, it can reflect the dynamic change of the temperature. According to the sustained change trend, the state of the stove is determined, rather than determining the state of the stove according to the instantaneous temperature value, so as to avoid the temperature data breakpoint or jump caused by the change of the kitchen environment temperature, other interference factors, etc., and thus avoid the false judgment of the real cooking state, and then effectively control the opening and closing of the range hood according to the state of the stove. Therefore, the present application can solve the problem of difficult effective control of the range hood. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0018] Figure 1 The flowchart provided for the first embodiment of the control method of the range hood of the present application; Figure 2 The logic architecture diagram provided for the second embodiment of the control method of the range hood of the present application; Figure 3 The logic architecture diagram provided for the third embodiment of the control method of the range hood of the present application; Figure 4 The device structure diagram of the hardware running environment involved in the control method of the range hood in the embodiments of the present application.

[0019] The object implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0020] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application, and are not used to limit the present application.

[0021] In order to better understand the technical solutions of the present application, the specific embodiments will be described in detail below with reference to the drawings and the accompanying drawings.

[0022] Since the method based on fixed threshold value judgment will cause temperature data breakpoints or jumps due to changes in kitchen environment temperature, other interference factors, etc., resulting in false judgment of the real cooking state, it is difficult to achieve effective control of the range hood.

[0023] The present application provides a control method of a range hood, which determines the use state of the cooktop according to the change direction and stability of the temperature change with time, rather than judging the use state of the cooktop according to the instantaneous temperature value, thereby avoiding false judgment of the real cooking state caused by temperature data breakpoints or jumps due to changes in kitchen environment temperature, other interference factors, etc., and effectively controlling the opening and closing of the range hood according to the use state of the cooktop.

[0024] Based on this, the embodiments of the present application provide a control method of a range hood, referring to Figure 1 , Figure 1 The flowchart of the first embodiment of the control method of the range hood of the present application. It should be noted that the execution subject of the present embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device, a range hood, etc. which can realize the above functions. The following will take the range hood as an example to describe the present embodiment and the following embodiments.

[0025] In the present embodiment, the control method of the range hood includes steps S10-S40: Step S10, obtaining current temperature data of the cooking area; Step S20, determining a continuous change trend of the temperature according to the current temperature data and historical temperature data continuous to the current time; Step S30, determining a state of the cooktop according to the continuous change trend; Step S40, controlling the opening and closing of the range hood according to the state of the cooktop.

[0026] Optionally, the range hood is used to extract and discharge the oil fume, steam and heat generated in the cooking area; the range hood can be installed directly above the cooking area, for example, integrated at the bottom of a hanging cabinet, embedded in a ceiling, or arranged on the side of the cooktop in a side suction type structure, so as to ensure effective coverage of the cooking area and efficient capture of the oil fume.

[0027] Optionally, the cooking area generally refers to an area where a pot is placed on the cooktop or heating operation is performed.

[0028] Optionally, the range hood is provided with a sensing module for sensing the temperature of the cooking area, which can be an infrared sensor or a thermopile sensor, etc. The current temperature data of the cooking area can be collected in real time through the sensing module.

[0029] Optionally, the sensing module is preferably an infrared sensor, which has the advantages of non-contact temperature measurement, fast response, strong anti-electromagnetic interference ability and suitability for high-temperature environment. The infrared sensor can quickly and accurately obtain the radiation temperature of the surface of the cooking area without direct contact with the measured object, thereby avoiding sensor aging, pollution or measurement distortion caused by physical contact.

[0030] Optionally, the sensing module can be arranged on the side wall of the range hood or at the position close to the cooktop directly above the bottom of the range hood. In this embodiment, the sensing module is arranged at the position close to the cooktop directly above the bottom of the range hood, so as to ensure accurate collection of the temperature data of the cooking area above the cooktop.

[0031] Optionally, the measurement area of the sensing module can cover the entire cooking area; the measurement area can also be dynamically adjusted according to the type of the cooktop (e.g., single-eye cooktop, double-eye cooktop, integrated cooktop, etc.). In the case of multiple cooktops, temperature data of each sub-area corresponding to each eye of the cooktop can be collected independently to realize intelligent control of different zones. For example, the range hood can control the extraction and discharge intensity of the oil fume in different cooking areas according to the temperature data collected in different zones, so as to reduce the power consumption and operating noise of the entire machine while ensuring the extraction and discharge effect.

[0032] Optionally, the current temperature data can include a temperature value measured at the current time, and also include a time stamp corresponding to the temperature value.

[0033] Optionally, the sampling frequency of the temperature data can be set according to actual needs, for example, 1 time per second, 1 time per 2 seconds, or automatically increasing the sampling frequency when detecting that the temperature change rate exceeds a first rate threshold, etc., to balance the response speed and power consumption control.

[0034] Optionally, to improve data reliability, the current temperature data can be filtered to suppress transient abnormal values caused by sensor noise or environmental interference.

[0035] Optionally, to accurately determine the use state of the stove, the present embodiment no longer relies on a single instantaneous temperature value, but uses a time series analysis method to use the current temperature data and historical temperature data continuously collected before the current time to comprehensively judge the continuous change trend of the temperature.

[0036] Optionally, the continuous change trend is used to represent the change direction and change stability of the temperature in a period of time, wherein the change direction includes rising, falling or stable, and the change stability includes whether the change rate is continuous or whether there is a mutation.

[0037] Optionally, the temperature change trend includes a continuous rising trend of the temperature, a continuous falling of the temperature, or a stable temperature, etc.

[0038] Optionally, the historical temperature data within a preset time window continuously from the current time can be read from the storage module of the range hood, for example, the preset time window can be the previous 30 seconds, the previous 60 seconds, or the previous N sampling periods.

[0039] Optionally, the length of the preset time window can be configured according to the heating characteristics of the stove, for example, a gas stove with fast heating can select a shorter time window, while an electromagnetic oven or slow cooking with slow heating can select a longer time window.

[0040] Optionally, according to the current temperature data and the historical temperature data continuously from the current time, the specific way to determine the continuous change trend of the temperature can be: by calculating the first-order difference or linear fitting slope of the temperature sequence composed of the current temperature data and the historical temperature data, quantifying the temperature change trend based on the first-order difference or linear fitting slope. For example, performing least squares fitting on the temperature sequence in the preset time window to obtain the slope and correlation coefficient of the fitting straight line, and determining the temperature change trend according to the slope and correlation coefficient.

[0041] Optionally, according to the continuous change trend of the temperature, the use state of the stove can be dynamically identified in combination with a preset state discrimination rule, thereby avoiding misjudgment caused by transient temperature fluctuations or environmental interference.

[0042] Optionally, the state determination parameters can be dynamically adjusted according to different cooking modes; for example, in the slow-cooking mode, a more gradual temperature rise slope is still recognized as valid use; while in the explosive stir-frying mode, higher requirements can be made on the temperature rise rate, but stronger tolerance is given to short interruptions (such as transient temperature drop caused by pot turning).

[0043] Optionally, the operation control of the range hood in this embodiment is no longer dependent on manual operation by the user or simple temperature threshold triggering, but is based on the use state of the cooktop to achieve intelligent, adaptive start-stop and operation adjustment, thereby improving user experience and energy efficiency while ensuring smoke exhaust effect.

[0044] Optionally, the use state of the cooktop can include a fire-on state and a fire-off state, and the specific way of controlling the opening and closing of the range hood according to the use state of the cooktop can be: When the use state of the cooktop is in the fire-on state, automatically start the fan of the range hood; when the use state of the cooktop is in the fire-off state, automatically stop the fan of the range hood.

[0045] Optionally, the fire-on state indicates that the cooktop is in the process of ignition or power-on heating; the fire-off state indicates that the cooktop has been extinguished or powered off.

[0046] Optionally, when the use state of the cooktop is in the fire-on state, the fire-on flag bit can be set to 1; when the state monitoring module of the range hood detects that the fire-on flag bit changes to 1, the fan is automatically started to start operation; when it is determined that the cooktop is in the fire-off state, the fire-off flag bit can be set to 0; when the state monitoring module of the range hood detects that the fire-off flag bit changes to 0, the fan is automatically stopped; refer to Figure 2 and Figure 3 .

[0047] Optionally, when the use state of the cooktop is in the fire-on state, the fan of the range hood can be automatically started without an intermediate flag bit, but by the state recognition module of the range hood directly sending a start instruction to the fan drive circuit.

[0048] Optionally, the range hood is started at a preset basic wind speed gear (e.g., low speed), to avoid noise impact caused by sudden high-speed operation.

[0049] Optionally, the initial wind speed can be dynamically selected according to the temperature rise rate or the current temperature: the faster the temperature rises and the higher the temperature, the higher the initial wind speed, to quickly respond to high-oil-smoke generation scenarios.

[0050] In the embodiment, the use state of the stove is determined according to the change direction and the continuous change trend of the temperature over time, rather than the instantaneous temperature value, so as to avoid the temperature data breakpoint or jump caused by the change of the kitchen environment temperature, other interference factors and the like, and thus the error judgment of the real cooking state is avoided, and the opening and closing of the range hood is effectively controlled according to the use state of the stove.

[0051] In addition, the embodiment adopts the non-contact infrared temperature measurement technology to monitor the temperature change of the cooking area above the stove in real time, and does not need to be electrically or communicatively connected with the stove, and does not depend on the material, shape or whether the pot has intelligent function, and has the advantages of simple installation, strong universality and wide application range. By analyzing the time series temperature data collected in real time, the continuous change trend of the temperature is analyzed, and the real use state of the stove is accurately recognized according to the continuous change trend, so that the automatic start and stop and operation control of the range hood are realized.

[0052] Based on the first embodiment of the application, the same or similar contents as the above embodiment one can be referred to the above introduction, and will not be described in detail. On this basis, the specific way of determining the use state of the stove according to the continuous change trend can be: determining the current scene according to the continuous change trend; and determining that the use state of the stove is the fire-off state when the current scene is the fire-off after cooking or the fire-off immediately after ignition.

[0053] In order to improve the accuracy of the use state recognition of the stove and effectively distinguish the real cooking behavior from the accidental heat source interference or user misoperation, the embodiment determines the current scene according to the continuous change trend, and determines the use state of the stove according to the current scene.

[0054] Optionally, the current scene refers to the semantic classification result of the user cooking behavior mode or the working state of the stove reflected by the continuous change trend of the temperature of the cooking area in the time dimension.

[0055] Optionally, the current scene includes the fire-off after cooking and the fire-off immediately after ignition.

[0056] Optionally, when the current scene is the fire-off after cooking or the fire-off immediately after ignition, the use state of the stove is determined as the fire-off state. Even in the scene of the fire-off immediately after ignition, the short-term temperature rise is not regarded as the effective cooking start, so as to avoid the misoperation of the range hood caused by the user.

[0057] Optionally, according to the continuous change trend, the current scene is determined, and then the cooking appliance usage state is determined according to the current scene, so that the user behavior semantics behind the temperature change can be understood for control, rather than only responding to the numerical change, thereby significantly reducing the probability of false start or delayed shutdown, and improving the intelligent level and user experience of the range hood automatic control.

[0058] Optionally, the continuous change trend includes a continuous downward trend and a continuous stabilization near the initial ambient temperature, and the implementation of determining the current scene according to the continuous change trend can be: When the continuous change trend is the continuous downward trend, it is determined that the current scene is the fire being turned off after cooking is completed; and when the continuous change trend is the continuous stabilization near the initial ambient temperature, it is determined that the current scene is the fire being turned off immediately after being turned on.

[0059] Optionally, the continuous downward trend refers to that the temperature data of the cooking area presents a monotonous decreasing or approximately monotonous decreasing change characteristic in a plurality of continuous sampling periods.

[0060] Optionally, the continuous stabilization near the initial ambient temperature refers to that the temperature data of the cooking area fluctuates with an amplitude less than a preset amplitude threshold and is overall maintained within an allowable deviation range of the initial ambient temperature in a plurality of continuous sampling periods.

[0061] Optionally, the initial ambient temperature refers to a reference ambient temperature value of the cooking area obtained by the sensing module and processed at the initialization stage of the range hood or after the cooking appliance is determined to be in a long-time non-use state. The temperature value is used to represent the background heat level of the current kitchen without the interference of the cooking appliance heating, and can be used as a reference for judging whether the temperature change is caused by real cooking behavior.

[0062] Optionally, when the temperature experiences an effective heating process and then turns into a continuous and stable downward trend (i.e., the continuous downward trend), it can be considered that the current scene is the fire being turned off after cooking is completed; and when the temperature changes near the initial ambient temperature and remains stable (i.e., the continuous stabilization near the initial ambient temperature), it can be considered that the current scene is the fire being turned off immediately after being turned on.

[0063] Optionally, in order to more accurately determine the current scene, the implementation of determining the current scene according to the continuous change trend can also be: when the continuous change trend is the continuous downward trend and the temperature decreasing rate is greater than a second rate threshold, it is determined that the current scene is the fire being turned off after cooking is completed; and when the continuous change trend is the continuous stabilization near the initial ambient temperature and the temperature appears a small amplitude rise in a short time but does not reach an effective cooking temperature, it is determined that the current scene is the fire being turned off immediately after being turned on.

[0064] Optionally, in order to more accurately determine the scenario of turning off the fire after cooking is completed, the following method can also be used: when the continuous change trend is a continuous rising trend within a certain time length, and a continuous falling trend within a certain time length, both of which are greater than a preset time length, and the highest temperature of the continuous rising trend is greater than the effective cooking temperature, it is determined that the current scenario is the scenario of turning off the fire after cooking is completed.

[0065] Optionally, with reference to Figure 2 , the specific way of determining the continuous change trend of the temperature according to the current temperature data and the historical temperature data can be: calculating a window average change rate of the temperature data within a preset first time period continuous to the current time according to the current temperature data and the historical temperature data; judging whether the window average change rate meets a temperature falling determination condition; if yes, accumulating the temperature falling number once; and when the temperature falling number accumulation reaches a preset first number, determining that the continuous change trend of the temperature is a continuous falling trend.

[0066] Optionally, in order to quickly respond to the user's turning off the fire during cooking, while effectively suppressing the temperature abnormal fluctuation caused by steam dissipation, air flow disturbance or sensor instantaneous drift, the embodiment calculates a window average change rate of the temperature data within a preset first time period continuous to the current time according to the current temperature data and the historical temperature data. It can be understood that the window average processing of the temperature data is adopted for the turning off the fire scenario, the overall average value is calculated according to a fixed time window, the smoothness is strong, the lag is large, and it is suitable for steady state judgment, so as to pay more attention to excluding residual heat fluctuation and confirming that the heat source is really disappeared, thereby accurately evaluating the temperature change stability within a long time.

[0067] Optionally, the preset first time period can be pre-configured according to the type of the stove, the cooking habit or the environmental interference characteristics, for limiting the time range of the sliding window or the trend analysis. For example, the preset first time period can be any value between 1 second and 5 seconds.

[0068] Optionally, the preset first time period can correspond to a fixed number of continuous sampling points. For example, if the temperature sampling period is 0.2 seconds, the preset first time period of 2 seconds corresponds to 10 continuous temperature data points (including the current sampling point).

[0069] Optionally, the manner of calculating the window average change rate of the temperature data in the preset first time period continuous to the current time according to the current temperature data and the historical temperature data can be: constructing a sliding window with a time length of the preset first time period according to the current temperature data and the historical temperature data continuous to the current time, and calculating the window average change rate of the temperature data in the sliding window; for example, the window average change rate is obtained by calculating the difference between the end temperature and the start temperature of the sliding window and then dividing the time interval, or the window average change rate is obtained by calculating the mean of the differences of all adjacent points in the sliding window.

[0070] Optionally, the temperature drop determination condition can be any of the following: the window average change rate is less than a preset negative threshold; the temperature in the sliding window as a whole is monotonically decreasing, and the fitting slope is greater than a preset negative value; the temperature standard deviation in the sliding window is less than a preset standard deviation threshold.

[0071] Optionally, it is judged whether the window average change rate meets the temperature drop determination condition; if the temperature drop determination condition is met, the temperature drop count is accumulated by one; if not, the count is cleared. Further, when the temperature drop count is continuously accumulated to a preset first number, it is determined that the continuous change trend of the temperature is a continuous decreasing trend.

[0072] Optionally, the preset first number can be preset according to the response sensitivity, anti-interference requirement and cooking cooling characteristics, and the preset first number can be 10-50 times; for example, when the window average change rates of the continuous multiple sliding windows corresponding to 10 or 50 consecutive times all meet the temperature drop condition, it is determined that the continuous change trend of the temperature is a continuous decreasing trend.

[0073] Optionally, the continuous change trend further includes being continuously stable around the initial ambient temperature, and the implementation manner of determining the continuous change trend of the temperature according to the current temperature data and the historical temperature data can be: calculating the window average temperature in a preset second time period continuous to the current time according to the current temperature data and the historical temperature data continuous to the current time; judging whether the difference between the window average temperature and the initial ambient temperature is less than a first difference threshold; if so, accumulating the continuous duration; and when the continuous duration is accumulated to a preset duration threshold, determining that the continuous change trend is continuously stable around the initial ambient temperature.

[0074] Optionally, a sliding window with a time length of the preset second time period can be constructed according to the current temperature data and the historical temperature data continuous to the current time, and the window average temperature of the temperature data in the sliding window can be calculated; the preset second time period can be the same as the preset first time period, or can be pre-configured according to the type of the stove, the cooking habit or the environmental interference characteristics.

[0075] Optionally, the first difference threshold value can be preset according to environmental temperature fluctuation characteristics, sensor accuracy, user usage habits or cooking modes, and the first difference threshold value can be 2-5℃, etc.

[0076] Optionally, it is judged whether the difference between the window average temperature and the initial environmental temperature is less than the first difference threshold value; if not, the accumulated duration is cleared to ensure the continuity of the stability judgment.

[0077] Optionally, it is judged whether the difference between the window average temperature and the initial environmental temperature is less than the first difference threshold value; if not, the accumulated duration is cleared to ensure the continuity of the stability judgment.

[0078] Optionally, the preset duration threshold value can be preset according to kitchen environment types (for example, closed kitchen or open kitchen), seasons, etc., and the preset duration threshold value can be 60-120 seconds, etc.

[0079] Optionally, when the accumulated duration reaches the preset duration threshold value, it is determined that the continuous change trend is continuously stable around the initial environmental temperature, for example, the difference between the window average temperature and the initial environmental temperature is less than 2℃, and the accumulated duration is 80 seconds, it is determined that the continuous change trend is continuously stable around the initial environmental temperature.

[0080] In the embodiment, by introducing a multi-scene fusion judgment mechanism, not only whether the temperature decreases is considered, but also the cooling duration, whether an effective heating process is experienced, whether it falls back to the vicinity of the environmental temperature, etc. are combined to identify multiple typical fire-off scenes including turning off the fire after cooking, turning off the fire immediately after ignition, etc. The machine misjudgment problem is effectively solved, and the situation that the range hood cannot be closed in time when the cooktop has stopped using can be avoided.

[0081] Based on the first and second embodiments of the present application, in the third embodiment of the present application, the same or similar contents as the above embodiments can be referred to the above introduction, and will not be described hereinafter. On this basis, referring to Figure 3 , the specific implementation of determining the continuous change trend of the temperature according to the current temperature data and the historical temperature data can be: According to the current temperature data and the historical temperature data, a moving average change rate of the temperature data in a preset third time period continuous to the current time is calculated; it is judged whether the moving average change rate meets the temperature rise judgment condition; if yes, the temperature rise count is accumulated once; when the temperature rise count reaches a preset second count, it is determined that the continuous change trend of the temperature is a continuous rising trend.

[0082] Optionally, the continuous change trend further includes a continuous rising trend. The continuous rising trend refers to that the temperature data of the cooking area presents a stable, monotonic or approximately monotonic rising characteristic in a plurality of consecutive sampling periods.

[0083] Optionally, in order to quickly respond to the fire-on behavior of the user in the cooking process, the embodiment calculates a moving average change rate of the temperature data in a preset third period of time continuous to the current moment according to the current temperature data and the historical temperature data. It can be understood that the moving average processing of the temperature data is adopted for the fire-off scene, and the overall average value is calculated according to the moving window. Each new data point is obtained, and the average value is immediately updated, so that the response is faster, and the short-time rapid temperature rising process in the fire-on process can be responded more quickly.

[0084] Since the fire-on process of the stove exhibits a short-time rapid temperature rising, and the fire-off process usually exhibits a slow temperature dropping or a temperature tending to be stable, there is a significant difference in the thermodynamic behavior, so that the moving average algorithm is adopted in the judgment of the fire-on scene in the application to quickly respond to the temperature mutation, and the window average algorithm is adopted in the judgment of the fire-off scene to enhance the stability identification of the long-term trend.

[0085] Optionally, the preset third period of time can be pre-configured according to the type of the stove, and is used to limit the time range of the moving window or the trend analysis. For example, the preset third period of time can be any value between 0.5 seconds and 2 seconds.

[0086] Optionally, the preset third period of time can correspond to a fixed number of consecutive sampling points. For example, if the temperature sampling period is 0.2 seconds, the preset third period of time of 2 seconds corresponds to 10 consecutive temperature data points (including the current sampling point).

[0087] Optionally, the way of calculating the moving average change rate of the temperature data in the preset third period of time continuous to the current moment according to the current temperature data and the historical temperature data can be: according to the current temperature data and the historical temperature data continuous to the current moment, a moving window with a time length of the preset third period of time is constructed, and the moving average change rate of the temperature data in the moving window is calculated; for example, the moving average change rate is obtained by calculating the difference between the smooth temperature of the moving window and the starting temperature and then dividing by the time interval, or the moving average change rate is obtained by calculating the mean value of the differences of all adjacent points in the moving window.

[0088] Optionally, the temperature rising determination condition can be any of the following: the moving average change rate is greater than a preset positive threshold; the temperature in the moving window as a whole presents a monotonic increasing, and the fitting slope is greater than a preset positive value.

[0089] Optionally, it is judged whether the moving average change rate meets the temperature rise determination condition; if the temperature rise determination condition is met, the temperature rise count is accumulated by one; if not, the count can be cleared. Further, when the temperature rise count is continuously accumulated to a preset second number, it is determined that the continuous change trend of the temperature is a continuous rising trend.

[0090] Optionally, the preset second number can be preset according to the response sensitivity, and the preset second number can be 40-80 times; for example, when the window average change rate of the corresponding continuous multiple moving windows meets the temperature rise condition for 40 or 80 consecutive times, it is determined that the continuous change trend of the temperature is a continuous rising trend.

[0091] Optionally, the implementation of determining the use state of the cooktop according to the continuous change trend can be: When the continuous change trend is a continuous rising trend, and the difference between the current temperature of the cooking area and the initial ambient temperature is greater than or equal to a second difference threshold, it is determined that the use state of the cooktop is a fire-on state.

[0092] Optionally, the second difference threshold can be preset according to the environmental temperature fluctuation characteristics and sensor accuracy, and the second difference threshold can be 2-5℃, etc.

[0093] Optionally, when the continuous change trend is a continuous rising trend, and the difference between the current temperature of the cooking area and the initial ambient temperature is greater than or equal to a second difference threshold, it is determined that the use state of the cooktop is a fire-on state. It can be understood that when the real ignition, the temperature will not only continuously and stably rise, but also will be significantly higher than the initial ambient temperature in a short time; and the interference of personnel walking, uncovering the pot cover, etc. only causes a short, small or non-continuous temperature fluctuation, which cannot meet the two conditions that the continuous change trend is a continuous rising trend, and the difference between the current temperature of the cooking area and the initial ambient temperature is greater than or equal to a second difference threshold; therefore, the above-mentioned method can effectively distinguish the real fire-on from non-cooking interference, and avoid the false start of the range hood.

[0094] Optionally, in order to accurately identify the fire-on state, it can also be judged whether the current scene is in a short fire-off, pot moving away or other cooking scene, so as to avoid being judged as a fire-off state and causing the range hood to shut down.

[0095] In the embodiment, the fire-on state is comprehensively judged by combining the continuous rising trend of the temperature and the temperature rise amplitude, so as to effectively distinguish the real cooking ignition from common non-cooking heat interference and avoid false start; at the same time, by combining the configurable moving average window and the dynamic threshold mechanism, the anti-interference ability and environmental adaptability are taken into account while ensuring fast response to the real fire-on behavior.

[0096] It should be noted that the above examples are only used for understanding the present application and do not constitute a limitation on the control method of the range hood of the present application, and more forms of simple transformation based on this technical concept are within the protection scope of the present application.

[0097] The present application provides a range hood, comprising: at least one processor; and a memory connected in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the control method of the range hood in the above-mentioned embodiment one.

[0098] Reference will now be made to the drawings, in which Figure 4 which shows a structural schematic diagram of a range hood suitable for being used to implement the embodiments of the present application. The range hood in the embodiments of the present application can include, but is not limited to, mobile terminals such as mobile phones, tablet computers, notebook computers, digital broadcast receivers, PDAs (Personal Digital Assistant: Personal Digital Assistant), PMPs (Portable MediaPlayer: Portable Multimedia Player), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), and the like, and fixed terminals such as digital televisions, desktop computers, and the like. Figure 4 The range hood shown is only an example and should not bring any limitation on the function and use range of the embodiments of the present application.

[0099] As Figure 4As shown, the range hood can include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.) that can perform various appropriate actions and processes according to a program stored in a read only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. Various programs and data required for operation of the range hood are also stored in the RAM 1004. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; the storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the range hood to communicate wirelessly or wired with other devices to exchange data. Although the range hood with various systems is shown in the figure, it should be understood that all of the shown systems are not required to be implemented or possessed. More or less systems can be alternatively implemented or possessed.

[0100] In particular, the processes described above with reference to the flowcharts can be implemented as a computer software program according to embodiments of the present disclosure. For example, embodiments of the present disclosure include a computer program product comprising a computer program carried on a computer readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network through the communication device, or installed from the storage device 1003, or installed from the ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the methods of embodiments of the present disclosure are performed.

[0101] The range hood provided by the present disclosure adopts the control method of the range hood in the above-mentioned embodiments, and can solve the technical problem that it is difficult to effectively control the range hood. Compared with the prior art, the range hood provided by the present disclosure has the same beneficial effects as the control method of the range hood provided by the above-mentioned embodiments, and other technical features in the range hood are the same as the features disclosed in the above-mentioned embodiments, which will not be repeated here.

[0102] It should be understood that portions of the application disclosed can be implemented in hardware, software, firmware, or combinations thereof. In the description of the embodiments above, specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0103] The above description is merely illustrative of the application and is not intended to limit the scope of the application. Any variations and modifications that can be made by those skilled in the art without departing from the spirit of the application are intended to be included in the scope of the application. The scope of the application should therefore be limited only by the claims.

[0104] The application provides a computer readable storage medium having stored thereon computer readable program instructions (i.e. computer programs) for performing the control method of the range hood in the above-described embodiments.

[0105] The computer readable storage medium provided by the application may, for example, be a U disk, but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, system, or device, or any combination thereof. More specific examples of the computer readable storage medium can include, but are not limited to, an electrical connection having one or more conductive wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present embodiment, the computer readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer readable storage medium can be transmitted in any suitable medium, including but not limited to electrical wire, optical cable, RF (Radio Frequency), etc., or any suitable combination thereof.

[0106] The above computer readable storage medium can be included in the range hood; or can exist separately and not be assembled into the range hood.

[0107] The above computer readable storage medium carries one or more programs, which, when executed by the range hood, cause the range hood to perform the control method of the range hood described above.

[0108] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0109] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0110] The modules involved in the embodiments of the present application can be implemented in software or hardware. In some cases, the names of the modules do not constitute a limitation on the modules themselves.

[0111] The readable storage medium provided by the present application is a computer readable storage medium, which stores computer readable program instructions (i.e., computer programs) for executing the control method of the range hood, and can solve the technical problem that it is difficult to effectively control the range hood. Compared with the prior art, the computer readable storage medium provided by the present application has the same beneficial effects as the control method of the range hood provided by the above-mentioned embodiments, and will not be described here.

[0112] The application further provides a computer program product comprising a computer program which, when executed by a processor, implements the steps of the control method of the range hood as described above.

[0113] The computer program product provided by the application can solve the technical problem of difficulty in effectively controlling the range hood. Compared with the prior art, the beneficial effects of the computer program product provided by the application are the same as those of the control method of the range hood provided by the above-mentioned embodiments, and are not described here.

[0114] The above only describes some embodiments of the application, and does not limit the protection scope of the application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like made by referring to the contents of the specification and drawings of the application is included in the protection scope of the application. In the application, all actions of obtaining signals, information or data are performed under the premise of complying with the corresponding data protection regulations and policies of the country where the application is located, and with the authorization of the owner of the corresponding device.

Claims

1. A control method for a range hood, characterized in that, The control method for the range hood includes: Obtain the current temperature data of the cooking area; Based on the current temperature data and continuous historical temperature data, determine the continuous trend of temperature change; The usage status of the stove is determined based on the described continuous change trend; The range hood is controlled to turn on and off according to the usage status of the stove.

2. The control method for a range hood according to claim 1, characterized in that, The stove's usage status includes a "turn-off" state. The step of determining the stove's usage status based on the continuous change trend includes: Based on the continuous changing trend, the current scenario is determined, wherein the current scenario includes turning off the heat after cooking and turning off the heat immediately after lighting the stove; When the current scenario is that the stove is turned off after cooking or immediately turned off after ignition, the stove's usage status is determined to be the off state.

3. The control method for a range hood according to claim 2, characterized in that, The continuous changing trend includes a continuous downward trend and a continuous stabilization near the initial ambient temperature. The step of determining the current scene based on the continuous changing trend includes: When the continuous change trend is a continuous downward trend, the current scenario is determined to be turning off the heat after cooking; When the continuous change trend is stable near the initial ambient temperature, the current scenario is determined to be ignition followed by immediate shutdown.

4. The control method for a range hood according to claim 1, characterized in that, The continuous trend includes a continuous downward trend. The step of determining the continuous trend of temperature change based on the current temperature data and historical temperature data includes: Based on the current temperature data and the historical temperature data, calculate the window average rate of change of temperature data within a preset first time period that is continuous with the current time. Determine whether the average rate of change of the window meets the temperature decrease determination condition; If the condition is met, the number of temperature drops will be counted once. When the cumulative number of temperature drops reaches a preset first number, the continuous trend of temperature change is determined to be a continuous downward trend.

5. The control method for a range hood according to claim 1, characterized in that, The continuous trend of change also includes a sustained stabilization near the initial ambient temperature. The step of determining the continuous trend of temperature change based on the current temperature data and historical temperature data includes: Based on the current temperature data and the historical temperature data, calculate the average temperature of the window within a preset second time period that is continuous with the current time. Determine whether the difference between the average temperature of the window and the initial ambient temperature is less than a first difference threshold. If it is less than, then the cumulative duration is calculated. When the cumulative duration reaches a preset duration threshold, the trend of continuous change is determined to be a continuous stabilization near the initial ambient temperature.

6. The control method for a range hood according to claim 1, characterized in that, The continuous trend of change also includes a continuous upward trend. The step of determining the continuous trend of temperature change based on the current temperature data and historical temperature data includes: Based on the current temperature data and the historical temperature data, calculate the moving average rate of change of the temperature data within a preset third time period that is continuous with the current time. Determine whether the moving average rate of change meets the temperature rise determination condition; If the condition is met, the number of temperature increases will be counted once. When the cumulative number of temperature increases reaches the preset second number, the continuous temperature change trend is determined to be a continuous upward trend.

7. The control method for a range hood according to claim 6, characterized in that, The stove's usage status also includes the ignition state. The step of determining the stove's usage status based on the continuous change trend includes: When the continuous change trend is a continuous upward trend, and the difference between the current temperature of the cooking area and the initial ambient temperature is greater than or equal to the second difference threshold, the stove is determined to be in the on state.

8. The control method for a range hood according to claim 1, characterized in that, The stove's operating status includes an on / off state and a flame-off state. The step of controlling the range hood to turn on and off according to the stove's operating status includes: When the stove is in the ignition state, the range hood fan will automatically start. When the stove is in the off state, the range hood fan will automatically turn off.

9. A range hood, characterized in that, The range hood includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for the range hood as described in any one of claims 1 to 8.

10. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the control method for the range hood as described in any one of claims 1 to 8.

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