Range hood control method and range hood

Abstract

The present invention relates to a control method of a range hood and a range hood, and relates to the technical field of intelligent household appliances. The range hood comprises: an infrared temperature sensor and a controller, and the method comprises: detecting the current heat radiation amount of the stove area in real time by the infrared temperature sensor; based on a manual shutdown instruction, turning off the fan of the range hood and lowering the sensitivity of the infrared temperature sensor; wherein the sensitivity is used to indicate the degree of change of the output electrical quantity when the change of the heat radiation amount causes the output electrical quantity of the infrared temperature sensor to change, and the higher the sensitivity, the greater the degree of change. The present invention can reduce the false start rate of the range hood provided with the infrared temperature sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent household appliances, and in particular to a control method for a range hood and the range hood. Background Art

[0002] When cooking, some users will turn on the gas stove first, and then turn on the range hood after seeing the oil smoke. However, when they turn on the range hood after seeing or smelling the oil smoke, the oil smoke has already spread, and it is difficult to effectively remove the oil smoke. Moreover, when the user finishes cooking, he will forget to turn off the range hood or fail to turn it off in time, causing the range hood to keep working and waste energy. Therefore, manufacturers will automatically control the on and off of the range hood through the range hood linkage technology. One of the range hood linkage technologies is to set an infrared temperature sensor in the range hood to sense the heat radiation of the gas stove, and automatically control the on and off of the range hood according to the sensed heat radiation, thereby realizing automatic control of the range hood.

[0003] However, the existing range hoods equipped with infrared temperature sensors may trigger the start of the range hoods by mistake. Therefore, how to reduce the false start rate of the range hoods equipped with infrared temperature sensors has become a technical problem to be solved urgently. Summary of the invention

[0004] One of the technical problems solved by the present invention is to provide a control method for a range hood, which can reduce the false start rate of the range hood provided with an infrared temperature sensor.

[0005] The second technical problem solved by the present invention is to provide a range hood capable of reducing the false start rate of the range hood provided with an infrared temperature sensor.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] A control method for a range hood, the range hood comprising: an infrared temperature sensor and a controller, the method comprising:

[0008] The infrared temperature sensor is used to detect the current heat radiation amount of the cooking area in real time;

[0009] Based on a manual shutdown command, the fan of the range hood is turned off and the sensitivity of the infrared temperature sensor is lowered; wherein the sensitivity is used to indicate the degree of change of the output electrical quantity when the change in the amount of thermal radiation causes the output electrical quantity of the infrared temperature sensor to change, and the higher the sensitivity, the greater the degree of change.

[0010] The control method of the range hood proposed in the embodiment of the present application first detects the current heat radiation amount of the stove area in real time through the infrared temperature sensor; then, based on the manual shutdown command, turns off the fan of the range hood and lowers the sensitivity of the infrared temperature sensor. The sensitivity in the embodiment of the present application is used to indicate the degree of change of the output electrical quantity when the change in the heat radiation amount causes the output electrical quantity of the infrared temperature sensor to change. The higher the sensitivity, the greater the degree of change. When the user manually turns off the fan of the range hood, the sensitivity of the infrared temperature sensor is automatically lowered, which can reduce the impact of ambient temperature fluctuations on the sensor and avoid false start-up caused by other heat sources in the kitchen. Therefore, the present application can reduce the false start rate of the range hood provided with an infrared temperature sensor.

[0011] The above second technical problem is solved by the following technical solution:

[0012] A range hood is used to execute the above method, and the range hood is provided with an infrared temperature sensor.

[0013] The range hood described in the present application implements the control method of the range hood as described above, firstly detecting the current heat radiation amount of the stove area in real time through the infrared temperature sensor; then based on the manual shutdown command, turning off the fan of the range hood and lowering the sensitivity of the infrared temperature sensor. The sensitivity in the embodiment of the present application is used to indicate the degree of change of the output electrical quantity when the change of the heat radiation amount causes the output electrical quantity of the infrared temperature sensor to change. The higher the sensitivity, the greater the degree of change. When the user manually turns off the fan of the range hood, the sensitivity of the infrared temperature sensor is automatically lowered, which can reduce the impact of ambient temperature fluctuations on the sensor and avoid false start-up caused by other heat sources in the kitchen. Therefore, the present application can reduce the false start rate of the range hood provided with an infrared temperature sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic flow chart of a range hood control method provided in one embodiment of the present application;

[0015] Figure 2 A schematic flow chart of a range hood control method provided by another embodiment of the present application;

[0016] Figure 3 A schematic flow chart of a method for determining a set time length according to a decreasing speed of heat radiation provided in an embodiment of the present application;

[0017] Figure 4 A schematic flow chart of a range hood control method provided in yet another embodiment of the present application;

[0018] Figure 5A schematic diagram of the structure of a control device for a range hood provided in one embodiment of the present application;

[0019] Figure 6 A schematic structural diagram of a range hood provided in one embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] Embodiment 1

[0025] Figure 1 The present invention provides a flow chart of a control method for a range hood according to an embodiment of the present invention. The range hood includes an infrared temperature sensor and a controller. The method can be executed by a control device of the range hood or the range hood. Figure 1 As shown, the control method of the range hood may include the following steps:

[0026] S101, detecting the current heat radiation amount of the cooking range in real time through an infrared temperature sensor.

[0027] An infrared temperature sensor is a non-contact temperature measurement device that measures the surface temperature of an object by detecting the infrared radiation emitted by it. According to Planck's law, any object with a temperature above absolute zero will emit infrared radiation; the higher the temperature of the object, the stronger the energy of the emitted infrared radiation. An infrared temperature sensor may include an infrared detector that is capable of receiving the infrared radiation emitted by an object and converting the received infrared radiation into an electrical signal.

[0028] The current heat radiation amount of the stove area in the embodiment of the present application refers to the heat radiation amount in a small range (usually a few centimeters to tens of centimeters) around the stove. This part of heat radiation mainly comes from the burning flame, the heated pot, and the heat emitted directly from the stove surface.

[0029] S102. Based on a manual shutdown command, the fan of the range hood is turned off, and the sensitivity of the infrared temperature sensor is lowered; wherein the sensitivity is used to indicate the degree of change of the output electrical quantity when the change of the thermal radiation causes the output electrical quantity of the infrared temperature sensor to change, and the higher the sensitivity, the greater the degree of change.

[0030] When the range hood is not in use, the infrared temperature sensor may detect small temperature changes in the surrounding environment, such as the temperature difference between indoor and outdoor, the approach of human body, etc. Although these changes are small, they may still be mistaken as the start of cooking activities in high sensitivity mode. Lowering the sensitivity can reduce the impact of these background noises and avoid false starts. Lowering the sensitivity is equivalent to raising the detection threshold, which means that the infrared temperature sensor will only trigger the start of the range hood when the ambient heat radiation reaches a higher level, which can effectively avoid false starts caused by small changes; and based on the manual shutdown command, the user clearly informs the system that the range hood is no longer needed after cooking. At this time, the system will turn off the fan and lower the sensor sensitivity to ensure that it will not be mistakenly started when the user is not using it. This active control method is more reliable than relying on automatic detection.

[0031] The control method of the range hood proposed in the embodiment of the present application first detects the current heat radiation amount of the stove area in real time through the infrared temperature sensor; then, based on the manual shutdown command, turns off the fan of the range hood and lowers the sensitivity of the infrared temperature sensor. The sensitivity in the embodiment of the present application is used to indicate the degree of change of the output electrical quantity when the change in the heat radiation amount causes the output electrical quantity of the infrared temperature sensor to change. The higher the sensitivity, the greater the degree of change. When the user manually turns off the fan of the range hood, the sensitivity of the infrared temperature sensor is automatically lowered, which can reduce the impact of ambient temperature fluctuations on the sensor and avoid false start-up caused by other heat sources in the kitchen. Therefore, the present application can reduce the false start rate of the range hood provided with an infrared temperature sensor.

[0032] Figure 2 This is a flow chart of a control method for a range hood provided by another embodiment of the present application. It is further optimized and expanded based on the above technical solution and can be combined with the above optional implementation methods. Figure 2 As shown, the control method of the range hood may include the following steps:

[0033] S201, detecting the current heat radiation amount of the cooking range in real time through an infrared temperature sensor.

[0034] S202. Based on the manual shutdown command, turn off the fan of the range hood and lower the sensitivity of the infrared temperature sensor; wherein the sensitivity is used to indicate the degree of change of the output electrical quantity when the change of the thermal radiation causes the output electrical quantity of the infrared temperature sensor to change, and the higher the sensitivity, the greater the degree of change.

[0035] In one embodiment, the sensitivity of the infrared temperature sensor is adjusted downward by more than 50% of the highest level of sensitivity.

[0036] S203: After lowering the sensitivity of the infrared temperature sensor, increase the sensitivity of the infrared temperature sensor within a set time period.

[0037] When cooking activities suddenly increase, the highly sensitive infrared temperature sensor can quickly capture the change in heat radiation, start or enhance the operation of the fan in time, and improve the response speed and efficiency of the range hood. Therefore, this application improves the sensitivity of the infrared temperature sensor within a set time, which can ensure that the infrared temperature sensor can more accurately detect the change in heat radiation during the cooking process, thereby more accurately controlling the operation status of the range hood.

[0038] The set time length in the embodiment of the present application can be a preset fixed time length; or the set time length can be determined according to the decreasing speed of the heat radiation amount.

[0039] The control method of the range hood proposed in the embodiment of the present application increases the sensitivity of the infrared temperature sensor within a set time after lowering the sensitivity of the infrared temperature sensor. The highly sensitive infrared temperature sensor can quickly capture the change in the amount of heat radiation, start or enhance the operation of the fan in time, and improve the response speed and efficiency of the range hood.

[0040] Figure 3 This is a flow chart of a method for determining a set time length according to a decreasing speed of the heat radiation provided in an embodiment of the present application. Figure 3 As shown, the method for determining the set time length according to the decreasing speed of the heat radiation amount may include the following steps:

[0041] S301, obtaining the current thermal radiation amount in real time, and calculating the decreasing speed of the thermal radiation amount.

[0042] In this step, a sampling period T can be set, for example, data is collected once per second. In each sampling period, the output value R(t) of the infrared temperature sensor is read, where t represents time. The thermal radiation data collected each time is stored in an array or list, and the two most recent data points are used to calculate the rate of decrease of the thermal radiation. Assume that the thermal radiation collected at time t and t+T are R(t) and R(t+T) respectively. The rate of decrease V can be calculated by the following formula: V=[R(t)-R(t+T)] / T.

[0043] S302: Determine the scene state of the cooking area according to the decreasing speed of the heat radiation amount, and adjust the end time of the set duration based on the scene state.

[0044] In this step, according to the decreasing speed of the heat radiation, the scene state of the stove area can be divided into the following situations: Rapid decrease: the decreasing speed V is greater than a certain higher threshold V high , indicating that the cooking activity has basically ended. Slow decline: The decline rate V is at a certain medium threshold V medium and a higher threshold V high The cooking activity is almost over, but there is still some residual temperature. Stable state: The falling speed V is less than a lower threshold V low , indicating that the cooking activity is still in progress or has just begun. According to different scene states, adjust the end time of the set duration to ensure that the range hood turns off the fan at the most appropriate time. Specifically, if the heat radiation is detected to drop rapidly, the set duration can be ended earlier and the fan can be turned off in advance; if the heat radiation is detected to drop slowly, the set duration can be appropriately extended to ensure that the remaining oil smoke is completely removed; if the heat radiation is detected to remain stable, the current set duration can be maintained and the changes in the heat radiation can continue to be monitored.

[0045] The method for determining the set duration according to the decreasing speed of the heat radiation amount proposed in the embodiment of the present application obtains the current heat radiation amount in real time and calculates the decreasing speed of the heat radiation amount; then the scene state of the stove area is determined according to the decreasing speed of the heat radiation amount, and the end time of the set duration is adjusted based on the scene state. When the heat radiation amount decreases rapidly, the fan can be turned off in time to avoid wasting time and energy; when the heat radiation amount decreases slowly, the set duration can be appropriately extended to ensure that the remaining oil smoke is completely removed. By accurately judging the decreasing speed of the heat radiation amount, the present application can avoid the range hood from continuing to run when there is no obvious oil smoke, thereby reducing unnecessary energy consumption.

[0046] Figure 4 A flow chart of a control method for a range hood provided in another embodiment of the present application. The above technical solution is further optimized and expanded, and can be combined with the above optional implementations. Figure 4 As shown, the control method of the range hood may include the following steps:

[0047] S401, detecting the ambient heat radiation of the range hood in real time through an infrared temperature sensor.

[0048] The ambient heat radiation of the range hood in the embodiment of the present application refers to the heat radiation in the kitchen environment where the range hood is located. This part of heat radiation includes not only the heat radiation of the stove area, but also the heat radiation of other heat sources in the kitchen, as well as changes in ambient temperature.

[0049] S402: Match the ambient thermal radiation with a first preset configuration table to determine a first preset threshold corresponding to the ambient thermal radiation; the first preset configuration table includes a correlation between the ambient thermal radiation and the first preset threshold.

[0050] The first preset configuration table in the embodiment of the present application may include: the correlation between the amount of ambient thermal radiation and the first preset threshold. Specifically, when the amount of ambient thermal radiation is within the first range, the value of the first preset threshold may be the first value; when the amount of ambient thermal radiation is within the second range, the value of the first preset threshold may be the second value; ...; when the amount of ambient thermal radiation is within the Nth range, the value of the first preset threshold may be the Nth value; wherein N is a natural number greater than or equal to 1. For example: ambient thermal radiation <100W / m²: first preset threshold = 80W / m²; 100W / m²≤ambient thermal radiation <200W / m²: first preset threshold = 150W / m²; 200W / m²≤ambient thermal radiation <300W / m²: first preset threshold = 250W / m²; ambient thermal radiation ≥300W / m²: first preset threshold = 350W / m².

[0051] S403: Detect the current heat radiation amount of the cooking area in real time through an infrared temperature sensor.

[0052] S404. Based on the manual shutdown command, turn off the fan of the range hood and lower the sensitivity of the infrared temperature sensor; wherein the sensitivity is used to indicate the degree of change of the output electrical quantity when the change of the thermal radiation causes the output electrical quantity of the infrared temperature sensor to change, and the higher the sensitivity, the greater the degree of change.

[0053] S405: After lowering the sensitivity of the infrared temperature sensor, increase the sensitivity of the infrared temperature sensor within a set time period.

[0054] S406: After turning off the fan of the range hood, comparing the output electrical quantity output by the infrared temperature sensor with a first preset threshold value.

[0055] In a specific embodiment of the present application, the ambient heat radiation of the range hood can also be detected in real time by an infrared temperature sensor; then the ambient heat radiation is matched with a first preset configuration table to determine a first preset threshold corresponding to the ambient heat radiation; the first preset configuration table includes a correlation between the ambient heat radiation and the first preset threshold. This method enables the range hood to automatically respond to changes in cooking activities without manual intervention. Once it is detected that the output electrical quantity reaches the first preset threshold, it means that cooking has started or the cooking intensity has increased, and the range hood will automatically start to deal with the oil smoke in a timely and effective manner. By precisely controlling the start-up timing of the fan, it can be ensured that sufficient suction force is provided when needed, avoiding the spread of oil smoke due to start-up delays, while also preventing ineffective operation when no oil smoke is generated, thereby improving overall work efficiency.

[0056] S407: If the output electrical quantity reaches a first preset threshold, the range hood is controlled to automatically start the fan.

[0057] This application adopts the method of automatically starting the range hood to ensure that the range hood only runs when needed. For example, after cooking starts, the stove in the kitchen starts to work, and the current or power increases to the first preset threshold, which automatically triggers the range hood to start the fan, so that the oil smoke generated during the cooking process can be removed in time, providing users with a fresher and more comfortable cooking environment, helping to maintain the quality of kitchen air and reduce the potential impact of oil smoke on human health.

[0058] S408: If the output electrical quantity does not reach the first preset threshold, the sensitivity of the infrared temperature sensor is maintained at the highest level of sensitivity.

[0059] In this step, if the output electrical quantity does not reach the first preset threshold, maintaining the highest sensitivity can ensure that the infrared temperature sensor detects the change immediately when the ambient heat radiation just starts to rise, so as to respond quickly and start the range hood in time. This helps to effectively deal with the oil smoke when it just starts to be generated and avoid the spread of oil smoke.

[0060] The control method of the range hood proposed in the embodiment of the present application detects the ambient heat radiation of the range hood in real time through an infrared temperature sensor; matches the ambient heat radiation with the first preset configuration table to determine the first preset threshold corresponding to the ambient heat radiation. The infrared temperature sensor in the embodiment of the present application can quickly respond to environmental changes and realize instant adjustment of the range hood. Whether in the initial or final stage of cooking, the range hood can quickly adapt to current needs and provide the best ventilation effect. In addition, when the output electrical quantity reaches the first preset threshold, the range hood is automatically controlled to automatically start the fan to promptly and effectively handle the oil smoke, ensure that sufficient suction force is provided when needed, and avoid the spread of oil smoke caused by startup delay.

[0061] Figure 5 The schematic diagram of the control device of the range hood provided in one embodiment of the present application. The range hood includes: an infrared temperature sensor and a controller. The device is suitable for executing the control method of the range hood provided in the embodiment of the present application. Figure 5 As shown, the control device of the range hood includes: a heat radiation detection module 501 and a sensitivity reduction module 502; wherein,

[0062] The thermal radiation detection module 501 is used to detect the current thermal radiation of the cooking area in real time through the infrared temperature sensor;

[0063] The sensitivity down-adjustment module 502 is used to turn off the fan of the range hood and down-adjust the sensitivity of the infrared temperature sensor based on a manual shutdown command; wherein the sensitivity is used to indicate the degree of change of the output electrical quantity when the change in the thermal radiation causes the output electrical quantity of the infrared temperature sensor to change, and the higher the sensitivity, the greater the degree of change.

[0064] The control device of the range hood described above can execute the method provided in any embodiment of the present application, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the control method of the range hood provided in any embodiment of the present application.

[0065] Figure 6 A schematic structural diagram of a range hood provided in one embodiment of the present application. Figure 6 A block diagram of an exemplary range hood suitable for implementing the embodiments of the present application is shown. Figure 6 The range hood 12 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0066] like Figure 6As shown, the components of the range hood 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 connecting different system components (including the system memory 28 and the processing unit 16).

[0067] Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. By way of example, these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0068] The range hood 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the range hood 12, including volatile and non-volatile media, removable and non-removable media.

[0069] The system memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. The range hood 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 34 may be used to read and write non-removable, non-volatile magnetic media ( Figure 6 not shown, usually called a "hard drive"). Although Figure 6 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to the bus 18 via one or more data medium interfaces. The system memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present application.

[0070] A program / utility 40 having a set (at least one) of range hood program modules 42, the program / utility 40 may include one or more program / utility units 46, the program / utility 40 may be stored in, for example, the system memory 28, such program modules 42 include but are not limited to an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules 42 generally perform the functions of the embodiments described herein.

[0071] The range hood 12 may also communicate with one or more external devices 14 (e.g., a keyboard, a pointing device, a display 24, etc.), one or more devices that enable a user to interact with the range hood 12, and / or any device that enables the range hood 12 to communicate with one or more other computing devices (e.g., a network card, a modem, etc.). Such communication may be performed via an input / output (I / O) interface 22. Furthermore, the range hood 12 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 20. As shown, the network adapter 20 communicates with other modules of the range hood 12 via the bus 18. It should be understood that although Figure 6 Not shown, other hardware and / or software modules may be used in conjunction with the range hood 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0072] The processing unit 16 executes various functional applications and data processing by running the programs stored in the system memory 28, such as implementing the control method of the range hood provided in the embodiment of the present application.

[0073] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The specific contents of the above specific embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A control method for a range hood, characterized in that: The range hood comprises: an infrared temperature sensor and a controller, and the method comprises: The infrared temperature sensor is used to detect the current heat radiation amount of the cooking area in real time; Based on the manual shutdown command, the fan of the range hood is turned off, and the sensitivity of the infrared temperature sensor is lowered; wherein the sensitivity is used to indicate the degree of change of the output electrical quantity when the change of the thermal radiation causes the output electrical quantity of the infrared temperature sensor to change, and the higher the sensitivity, the greater the degree of change; After the fan of the range hood is turned off, comparing the output electrical quantity output by the infrared temperature sensor with a first preset threshold value; If the output electrical quantity reaches the first preset threshold, the range hood is controlled to automatically start the fan.

2. The method according to claim 1, characterized in that: The method further comprises: After lowering the sensitivity of the infrared temperature sensor, the sensitivity of the infrared temperature sensor is increased within a set time period.

3. The method according to claim 2, characterized in that: The set time length is a preset fixed time length; or the set time length is determined according to the decreasing speed of the heat radiation amount.

4. The method according to claim 3, characterized in that: The steps of determining the set time length according to the decreasing speed of the heat radiation amount include: Acquire the current thermal radiation amount in real time, and calculate the decreasing speed of the thermal radiation amount; The scene state of the cooking range area is determined according to the decreasing speed of the heat radiation amount, and the end time of the set duration is adjusted based on the scene state.

5. The method according to claim 2, characterized in that: The sensitivity includes multiple levels of sensitivity values, and lowering the sensitivity of the infrared temperature sensor includes lowering the sensitivity of the infrared temperature sensor to a lowest level of sensitivity value.

6. The method according to claim 5, characterized in that: The step of increasing the sensitivity of the infrared temperature sensor within a set time period includes: In a plurality of time segments within a set time, the sensitivity of the infrared temperature sensor is gradually increased until the sensitivity is increased to a highest level of sensitivity.

7. The method according to claim 1, characterized in that: After turning off the fan of the range hood, the method further includes: The infrared temperature sensor is used to detect the ambient heat radiation of the range hood in real time; The environmental thermal radiation amount is matched with a first preset configuration table to determine a first preset threshold value corresponding to the environmental thermal radiation amount; the first preset configuration table includes an association relationship between the environmental thermal radiation amount and the first preset threshold value.

8. The method according to claim 1, characterized in that: The sensitivity of the infrared temperature sensor is lowered by more than 50% of the highest level of sensitivity.

9. A range hood, characterized in that: Used to execute the method described in any one of claims 1 to 8 above, the range hood is provided with an infrared temperature sensor.

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