Coke pot detection method and device and range hood

Abstract

The invention discloses a coke pot detection method and device and a range hood. The coke pot detection method is applied to the range hood, the range hood comprises a negative ion module, a first transmitting device, a second transmitting device and a signal receiving device, after the range hood starts to work, the negative ion module is started, and the first transmitting device and the second transmitting device are controlled to alternately work at a set time interval; a signal receiving device is used for receiving the total first signal intensity of the oil smoke particulate matter scattered by the emission signal with the first wavelength and the total second signal intensity of the oil smoke particulate matter scattered by the emission signal with the second wavelength; determining a carbonized particulate matter concentration corresponding to the carbonized particulate matter according to the total first signal intensity and the total second signal intensity, and determining a corresponding particulate matter concentration rising rate and a carbonized particulate matter proportion according to the carbonized particulate matter concentration; according to the carbonized particulate matter concentration, the particulate matter concentration rising rate and the carbonized particulate matter proportion, whether the current cookware is scorched or not is determined. According to the invention, accurate judgment of the coke pot condition is realized.

Description

Technical Field

[0001] This invention relates to the field of smart home technology, and in particular to a method, device, and range hood for detecting burnt food. Background Technology

[0002] One key concern for users during cooking is scorching. Scorching occurs when food in a pan burns or burns at high temperatures. Not only does it ruin the cooking process, but it also contaminates cookware, making it difficult to clean, and in severe cases, it can even cause a fire, posing a safety hazard to the kitchen. Therefore, installing a device in the kitchen to detect and prevent scorching is essential.

[0003] Currently, the main methods for detecting burnt pots on the market are through smoke alarms (smoke detectors) or temperature detection of the bottom of the pot. Smoke alarms often only respond when the smoke concentration is already very high, or even when the user can see the smoke with the naked eye. By this time, the burnt pot phenomenon has already occurred for a long time, making them not very practical. Temperature detection methods are difficult to adapt to various types of pots, and the system has a high false judgment rate, making it impossible to accurately detect burnt pot conditions. Summary of the Invention

[0004] This invention provides a method, device, and smoke machine for detecting burnt pots, in order to solve the problems of slow response, inaccurate detection of burnt pot conditions, high false judgment rate, and poor versatility in current burnt pot detection methods.

[0005] According to one aspect of the present invention, a method for detecting scorched oil fume is provided. This method is applied to a range hood, which includes a negative ion module, a first emitting device, a second emitting device, and a signal receiving device. The negative ion module generates negative oxygen ions to cause oil fume particles to aggregate. The first emitting device generates a first wavelength emission signal, the second emitting device generates a second wavelength emission signal, and the signal receiving device receives the scattered signal from the oil fume particles. The scorched oil fume detection method includes:

[0006] After the range hood starts working, the negative ion module is activated, and the first and second emitting devices are controlled to work alternately at set intervals.

[0007] The signal receiving device is used to receive the overall first signal intensity of oil fume particles after being scattered by the first wavelength of the transmitted signal and the overall second signal intensity after being scattered by the second wavelength of the transmitted signal.

[0008] The concentration of carbonized particulate matter corresponding to the overall first signal intensity and the overall second signal intensity are determined, and the corresponding particulate matter concentration rise rate and the proportion of carbonized particulate matter are determined based on the carbonized particulate matter concentration.

[0009] Whether the cookware is burning is determined based on the concentration of carbonized particulate matter, the rate of increase of particulate matter concentration, and the proportion of carbonized particulate matter.

[0010] Optionally, the concentration of carbonized particulate matter corresponding to the carbonized particulate matter is determined based on the overall first signal intensity and the overall second signal intensity, including:

[0011] The intensity of the carbonized particulate scattering signal and the intensity of the oil droplet scattering signal received by the signal receiving device are determined based on the overall first signal intensity and the overall second signal intensity.

[0012] The concentration of carbonized particles corresponding to the carbonized particles is determined based on the scattering signal intensity of carbonized particles and the scattering signal intensity of oil droplets.

[0013] Optionally, before determining the corresponding rate of increase in particulate matter concentration and the proportion of carbonized particulate matter based on the carbonized particulate matter concentration, the method further includes:

[0014] The concentration of oil droplets corresponding to the overall first signal intensity and the overall second signal intensity are determined.

[0015] The percentage of carbonized particulate matter is determined based on the concentration of carbonized particulate matter, including:

[0016] The corresponding proportion of carbonized particles is determined based on the concentration of carbonized particles and the concentration of oil droplets.

[0017] Optionally, before determining whether the cookware is scorching based on the concentration of carbonized particles, the rate of increase in particle concentration, and the proportion of carbonized particles, the following steps are also included:

[0018] Get the current bottom temperature of the pot, and determine the corresponding temperature rise rate and whether there is a risk of burning the pot based on the current bottom temperature;

[0019] Determining whether the cookware is scorching based on the concentration of carbonized particles, the rate of increase in particle concentration, and the proportion of carbonized particles includes:

[0020] After determining that the cookware is at risk of scorching, the presence of scorching is determined based on the rate of temperature rise, the concentration of carbonized particles, the rate of increase in particle concentration, and the proportion of carbonized particles.

[0021] Optionally, determine whether there is a risk of burning in the cookware based on the current bottom temperature, including:

[0022] If the current temperature of the bottom of the pot is greater than or equal to the scorching threshold temperature, it is determined that the current pot is at risk of scorching.

[0023] If the current bottom temperature of the pot is lower than the scorching threshold temperature, the bottom temperature of the pot will continue to be monitored.

[0024] Optionally, whether the cookware is scorching can be determined based on the rate of temperature rise, the concentration of carbonized particles, the rate of increase in particle concentration, and the proportion of carbonized particles, including:

[0025] If the concentration of carbonized particulate matter is greater than or equal to the particulate matter concentration threshold, and / or the rate of increase of particulate matter concentration is greater than or equal to the concentration rate threshold, then it is determined whether the current cookware will burn based on the proportion of carbonized particulate matter and the rate of increase of temperature.

[0026] If the concentration of carbonized particulate matter is less than the particulate matter concentration threshold, and the rate of increase in particulate matter concentration is less than the concentration rate threshold, then the concentration of carbonized particulate matter corresponding to the carbonized particulate matter is obtained again.

[0027] Optionally, determine whether the cookware is burning based on the proportion of carbonized particles and the rate of temperature rise, including:

[0028] If the rate of temperature rise is less than the temperature rate threshold, the concentration of carbonized particulate matter corresponding to the carbonized particulate matter is re-acquired.

[0029] If the rate of temperature rise is greater than or equal to the temperature rate threshold, and the proportion of carbonized particulate matter is greater than or equal to the particulate matter concentration proportion threshold, then it is determined that the current cookware is scorched.

[0030] If the rate of temperature rise is greater than or equal to the temperature rate threshold, and the proportion of carbonized particles is less than the proportion of particle concentration threshold, then it is determined that the cookware has not scorched.

[0031] Optionally, whether the cookware is scorching can be determined based on the rate of temperature rise, the concentration of carbonized particles, the rate of increase in particle concentration, and the proportion of carbonized particles, including:

[0032] If any of the following conditions are met: the concentration of carbonized particulate matter is greater than or equal to the particulate matter concentration threshold and / or the rate of increase of particulate matter concentration is greater than or equal to the concentration rate threshold, the rate of increase of temperature is greater than or equal to the temperature rate threshold, and the proportion of carbonized particulate matter is greater than or equal to the proportion of particulate matter concentration, then it is determined that the current cookware has not scorched and the risk of scorching is low.

[0033] If any two of the following conditions are met: the concentration of carbonized particulate matter is greater than or equal to the particulate matter concentration threshold and / or the rate of increase of particulate matter concentration is greater than or equal to the concentration rate threshold, the rate of increase of temperature is greater than or equal to the temperature rate threshold, and the proportion of carbonized particulate matter is greater than or equal to the proportion of particulate matter concentration, then it is determined that the current cookware has not scorched, but the risk of scorching is high.

[0034] If the concentration of carbonized particulate matter is greater than or equal to the particulate matter concentration threshold and / or the rate of increase of particulate matter concentration is greater than or equal to the concentration rate threshold, the rate of increase of temperature is greater than or equal to the temperature rate threshold, and the proportion of carbonized particulate matter is greater than or equal to the proportion of particulate matter concentration threshold, then it is determined that the current cookware has scorched.

[0035] According to another aspect of the present invention, a scorch pot detection device is provided. The scorch pot detection device includes a fan, a negative ion module disposed in front of the fan, a channel valve, a particulate matter detection channel, a first emitting device and a second emitting device disposed in the particulate matter detection channel, and a signal receiving device. The negative ion module is used to generate negative oxygen ions to cause oil fume particles to aggregate. The first emitting device is used to generate a first wavelength emission signal, the second emitting device is used to generate a second wavelength emission signal, and the signal receiving device is used to receive the scattered signal of oil fume particles. The scorch pot detection device is used to implement the scorch pot detection method of any embodiment of the present invention.

[0036] According to another aspect of the present invention, a smoke hood is provided, which includes a scorch detection device according to any embodiment of the present invention.

[0037] The technical solution of this invention relates to a method for detecting scorched oil fume, applied to a range hood. The range hood includes a negative ion module, a first emitting device, a second emitting device, and a signal receiving device. The negative ion module generates negative oxygen ions to cause oil fume particles to aggregate. The first emitting device generates a first wavelength emission signal, the second emitting device generates a second wavelength emission signal, and the signal receiving device receives the scattered signal from the oil fume particles. The method for detecting scorched oil fume includes: after the range hood starts working, activating the negative ion module and controlling the first and second emitting devices to alternately operate at set intervals; further, using the signal receiving device to receive the overall first signal intensity after scattering by the first wavelength emission signal and the overall second signal intensity after scattering by the second wavelength emission signal, respectively, so that under the action of the negative ion module, many oil fume particles are agglomerated. Carbonized particles adsorb together with other small oil droplets, forming composite particle clusters. This allows for more effective detection of oil fume particles generated when the pot is scorched, resulting in lower costs and higher overall stability. Furthermore, the concentration of carbonized particles is determined based on the overall first and second signal intensities. The corresponding particle concentration rise rate and carbonized particle proportion are then determined based on the carbonized particle concentration. By utilizing the different absorption rates of carbonized particles and oil droplets at different signal wavelengths, the two can be distinguished, and their corresponding particle concentrations can be calculated separately. Based on the above, the presence of scorched pot is determined by the carbonized particle concentration, particle concentration rise rate, and carbonized particle proportion. By using multiple factors to jointly determine whether scorching has occurred, more accurate detection of scorching can be achieved, reducing the false positive rate.

[0038] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a flowchart of a method for detecting burnt pots according to an embodiment of the present invention;

[0041] Figure 2 This is a flowchart of a method for detecting burnt pots according to an embodiment of the present invention;

[0042] Figure 3 This is a flowchart of a method for detecting burnt pots according to an embodiment of the present invention;

[0043] Figure 4 This is a flowchart of a method for detecting burnt pots according to an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of a scorch pot detection device provided according to an embodiment of the present invention;

[0045] Figure 6 This is a structural main perspective view of a range hood provided according to an embodiment of the present invention;

[0046] Figure 7 This is a structural side perspective view of a range hood provided according to an embodiment of the present invention. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0049] Figure 1 The present invention provides a flowchart of a method for detecting burnt food. This embodiment can be applied to situations where burnt food is detected more accurately. The method for detecting burnt food can be executed by a burnt food detection device, which can be implemented in hardware and / or software and can be configured in a tobacco machine.

[0050] The method for detecting burnt oil fumes is applied to a range hood. The range hood includes a negative ion module, a first emitting device, a second emitting device, and a signal receiving device. The negative ion module generates negative oxygen ions to cause oil fume particles to aggregate. The first emitting device generates a first wavelength emission signal, which can be an infrared emitting device for emitting the first wavelength. The second emitting device generates a second wavelength emission signal, which can also be an infrared emitting device for emitting the second wavelength. Since the absorption rates of carbonized particles and oil droplets differ at different wavelengths, the first and second wavelengths are not equal in order to distinguish the concentrations of carbonized particles and oil droplets. The first and second wavelengths can be adjusted according to the structure of the range hood and the specific particle composition to be the wavelengths corresponding to the two infrared lights that provide the best overall testing effect. This embodiment does not impose any restrictions on this. The signal receiving device is used to receive the scattered signal of oil fume particles.

[0051] like Figure 1 As shown, the method for detecting burnt pots includes:

[0052] S110. After the smoke machine starts working, the negative ion module is activated, and the first and second emitting devices are controlled to work alternately at a set interval.

[0053] In this embodiment, after the range hood starts working, the negative ion module is activated to emit negative oxygen ions into the current oil fumes. This causes oil fume particles with a diameter in the range of 0.05μm to 0.3μm to aggregate, increasing the particle size. This makes them distinguishable under the emission signals of different wavelengths generated by the first and second emitting devices, thereby determining the concentration of carbonized particles and oil droplets in the current oil fumes. Furthermore, it can confirm whether the cookware is scorched.

[0054] Both carbonized particles and oil droplets are undetectable particles under the emission signals of different wavelengths generated by the first and second emission devices. However, after being aggregated by the negative oxygen ions generated by the negative ion module, carbonized particles and oil droplets form oil fume particles with a particle size in the range of 0.3μm to 1.0μm. At this point, they can be detected and distinguished under the emission signals of different wavelengths generated by the first and second emission devices.

[0055] The first and second emitting devices work alternately, meaning that only one emitting device operates at a time while the other is turned off. The emitting device that operates alone emits an infrared signal of the corresponding wavelength into the particulate matter detection channel. Specifically, the first and second emitting devices are controlled to work alternately at intervals of a set time length, i.e., the set time length t0 for the first emitting device — the set time length t0 for the second emitting device — the set time length t0 for the first emitting device, and so on.

[0056] The set time length t0 can be selected and set according to the needs of scorch pot detection. In this embodiment, the specific value of the set time length t0 is not specially limited.

[0057] It is understandable that, besides using the first and second transmitting devices to work alternately, other solutions can be employed to achieve the desired effect. For example, instead of using infrared transmitting devices that can only emit signals of a single wavelength, the first and second transmitting devices can use integrated infrared modules that can actively adjust the signal wavelength. Such integrated infrared modules can emit a wider variety of infrared signals, allowing different wavelength signals to be selected according to different needs. They can also sequentially emit multiple infrared signals of different wavelengths, increasing the data sample size and making subsequent related data calculations more accurate.

[0058] In another embodiment, the first and second transmitting devices can be controlled to operate simultaneously to avoid interruptions during signal detection. However, in this case, scattered signals of different wavelengths will be mixed together, making it difficult to distinguish between oil fume particles with a particle size in the range of 0.3 μm to 1.0 μm within the receiving range. Therefore, two bandpass filter circuits capable of filtering signals of different wavelengths can be set before the oil fume particle receiving range with a particle size in the range of 0.3 μm to 1.0 μm. After filtering, the same wavelength signals as the first and second transmitting devices can be obtained respectively. Simultaneously, the oil fume particle receiving range with a particle size in the range of 0.3 μm to 1.0 μm also needs to meet the condition of simultaneously receiving and recording two different signals.

[0059] S120. The signal receiving device receives the overall first signal intensity of the oil fume particles after being scattered by the first wavelength of the transmitted signal and the overall second signal intensity after being scattered by the second wavelength of the transmitted signal.

[0060] Based on the above, after the first transmitting device has been in operation for a set time t0, the signal receiving device is used to receive the overall signal intensity of the oil fume particles after being scattered by the first wavelength of the transmitted signal. After the second transmitting device has been in operation for a set time t0, the signal receiving device is used to receive the overall signal intensity of the oil fume particles after being scattered by the second wavelength of the transmitted signal. This process is repeated, and the overall signal intensity is recorded at least once in sequence to obtain the overall first signal intensity of the oil fume particles after being scattered by the first wavelength of the transmitted signal and the overall second signal intensity after being scattered by the second wavelength of the transmitted signal.

[0061] S130. Determine the carbonized particulate matter concentration corresponding to the overall first signal intensity and the overall second signal intensity, and determine the corresponding particulate matter concentration rise rate and carbonized particulate matter proportion based on the carbonized particulate matter concentration.

[0062] When the first and second emitting devices emit infrared light of different wavelengths, the intensity of the particulate matter scattering signal is inversely proportional to the light absorption rate of the particulate matter. For example, taking a first wavelength of 640nm and a second wavelength of 940nm as examples, under infrared light with a first wavelength of 640nm, the light absorption rate of carbonized particles is about 95%, the absorption rate of oil droplet particles is about 30%, the scattering signal intensity of carbonized particles is I1, and the scattering signal intensity of oil droplet particles is I2 (ignoring the influence of Mie scattering), and the overall first signal intensity of oil fume particles after being scattered by the emission signal of the first wavelength is A1; under infrared light with a first wavelength of 940nm, the light absorption rate of carbonized particles is about 98%, the absorption rate of oil droplet particles is about 50%, the scattering signal intensity of carbonized particles is (1-0.98) / (1-0.95)=0.4I1, the scattering signal intensity of oil droplet particles is (1-0.5) / (1-0.3)≈0.71I2, and the overall second signal intensity of oil fume particles after being scattered by the emission signal of the second wavelength is A2.

[0063] However, the influence of wavelength on signal intensity under Mie scattering cannot be completely ignored. When the particle size is in the range of 0.3 μm to 10 μm, the overall signal intensity A is related to the wavelength. The wavelength is directly proportional to the scattered signal intensity; that is, the longer the wavelength, the lower the intensity of the scattered signal. Therefore, the corresponding calculation equation can be derived as follows:

[0064]

[0065]

[0066] The values ​​of the scattering signal intensity I1 of carbonized particles and the scattering signal intensity I2 of oil droplets can be obtained by simple calculation using a two-variable linear equation, as follows:

[0067] I1=(309276A1−883600A2) / 0.31

[0068] I2=(883600A2−174240A1) / 0.31

[0069] Based on the above, after obtaining the overall first signal intensity A1 and the overall second signal intensity A2, they can be substituted into the above formula to calculate the scattering signal intensity of carbonized particles and the scattering signal intensity of oil droplets.

[0070] Furthermore, after calculating the scattering signal intensity of carbonized particles and the scattering signal intensity of oil droplets, the carbonized particle concentration corresponding to carbonized particles and the oil droplet concentration corresponding to oil droplets can be obtained respectively according to existing particle concentration calculation methods. This embodiment does not impose any special restrictions on existing particle concentration calculation methods.

[0071] The proportion of oil fume particles of different sizes varies. The proportion of carbonized particles is determined based on the concentration of carbonized particles and the concentration of oil droplets. The higher the proportion of carbonized particles, the lower the concentration of oil droplets in the current oil fume, and the greater the possibility of scorching.

[0072] The particulate matter concentration rise rate is the rate of increase in concentration obtained by calculating the carbonized particulate matter concentration. The particulate matter concentration rise rate is obtained by the difference between the carbonized particulate matter concentrations collected at a set time interval. Specifically: k = ΔC1 / t0, where k is the particulate matter concentration rise rate and ΔC1 is the difference between the carbonized particulate matter concentrations collected at a set time interval. The larger the particulate matter concentration rise rate k is, the faster the carbonized particulate matter concentration rises.

[0073] S140. Determine whether the cookware is burning based on the concentration of carbonized particulate matter, the rate of increase of particulate matter concentration, and the proportion of carbonized particulate matter.

[0074] Based on the above, if the concentration of carbonized particulate matter is greater than or equal to the particulate matter concentration threshold, and the rate of increase in particulate matter concentration is greater than or equal to the concentration rate threshold, then the proportion of carbonized particulate matter is used to further determine whether the cookware will burn. Similarly, if the concentration of carbonized particulate matter is greater than or equal to the particulate matter concentration threshold, or the rate of increase in particulate matter concentration is greater than or equal to the concentration rate threshold, then the proportion of carbonized particulate matter is used to further determine whether the cookware will burn. In other words, if the concentration of carbonized particulate matter is high or rising rapidly, posing a risk of burning, then the proportion of carbonized particulate matter is used to determine whether the cookware will burn.

[0075] If the concentration of carbonized particulate matter is less than the particulate matter concentration threshold, and the rate of increase in particulate matter concentration is less than the concentration rate threshold, then the concentration of carbonized particulate matter corresponding to the carbonized particulate matter is obtained again.

[0076] The particulate matter concentration threshold and concentration rate threshold can both be selected and set based on factors such as the risk of burnt food. In this embodiment, no special restrictions are placed on the specific values ​​of the particulate matter concentration threshold and concentration rate threshold.

[0077] Furthermore, if the proportion of carbonized particulate matter is greater than or equal to the particulate matter concentration percentage threshold, it indicates that the risk of scorching is already very high, and the cookware is confirmed to have scorched. If the proportion of carbonized particulate matter is less than the particulate matter concentration percentage threshold, it cannot be determined that scorching has occurred, and the cookware is confirmed not to have scorched. In this case, although the possibility of scorching is high, it cannot be completely confirmed. A prompt can be issued to remind the user to adjust the temperature and stir the food in time to avoid scorching.

[0078] The particulate matter concentration percentage threshold is selected and set based on the obvious difference in particulate matter concentration between the scorched pot and the misjudged action. In this embodiment, no special restrictions are placed on the specific value of the particulate matter concentration percentage threshold.

[0079] Understandably, in one embodiment, whether the current cookware is burning can be determined mainly by three conditions: the first condition is that the concentration of carbonized particles is greater than or equal to a particle concentration threshold and / or the rate of increase of particle concentration is greater than or equal to a concentration rate threshold; the second condition is that the rate of increase of temperature is greater than or equal to a temperature rate threshold; and the third condition is that the proportion of carbonized particles is greater than or equal to a particle concentration proportion threshold. All three conditions can be determined simultaneously, specifically: if the concentration of carbonized particles is greater than or equal to a particle concentration threshold and / or the rate of increase of particle concentration is greater than or equal to a concentration rate threshold, the rate of increase of temperature is greater than or equal to a temperature rate threshold, and the proportion of carbonized particles is greater than or equal to a particle concentration proportion threshold, then... If any one of the following conditions is met, it is determined that the current cookware has not scorched and the risk of scorching is low. If any two of the following conditions are met: the carbonized particulate matter concentration is greater than or equal to the particulate matter concentration threshold and / or the particulate matter concentration rise rate is greater than or equal to the concentration rate threshold, the temperature rise rate is greater than or equal to the temperature rate threshold, and the carbonized particulate matter percentage is greater than or equal to the particulate matter concentration percentage threshold, it is determined that the current cookware has scorched and the risk of scorching is high. If the carbonized particulate matter concentration is greater than or equal to the particulate matter concentration threshold and / or the particulate matter concentration rise rate is greater than or equal to the concentration rate threshold, the temperature rise rate is greater than or equal to the temperature rate threshold, and the carbonized particulate matter percentage is greater than or equal to the particulate matter concentration percentage threshold, it is determined that the current cookware has scorched.

[0080] The technical solution of this invention relates to a method for detecting burnt food in a range hood. The range hood includes a negative ion module, a first emitting device, a second emitting device, and a signal receiving device. The negative ion module generates negative oxygen ions to cause oil fume particles to aggregate. The first emitting device generates a first wavelength emission signal, the second emitting device generates a second wavelength emission signal, and the signal receiving device receives the scattered signal from the oil fume particles. The method for detecting burnt food in a range hood includes: after the range hood starts working, activating the negative ion module and controlling the first and second emitting devices to work alternately at a set time interval; using the signal receiving device to receive the overall first signal intensity after the oil fume particles are scattered by the first wavelength emission signal and the overall second signal intensity after being scattered by the second wavelength emission signal; determining the carbonized particle concentration corresponding to the carbonized particles based on the overall first signal intensity and the overall second signal intensity, and determining the corresponding particle concentration rise rate and carbonized particle percentage based on the carbonized particle concentration; and determining whether the current cookware has burnt food in a range hood based on the carbonized particle concentration, the particle concentration rise rate, and the carbonized particle percentage. The embodiments of the present invention solve the problems of slow response, inaccurate detection of scorching, high false positive rate, and poor versatility of current scorching detection methods. By using multiple factors to jointly determine whether scorching has occurred, the invention achieves more accurate detection of scorching and reduces the false positive rate.

[0081] Based on the above embodiments, Figure 2 This is a flowchart illustrating a method for detecting burnt pots according to an embodiment of the present invention. It considers determining the risk of burnt pots by considering changes in the temperature at the bottom of the pot. This allows for timely and accurate assessment of whether burnt pots have occurred after a risk of burnt pots is identified, enabling prompt handling and improving the overall stability of the pots. This provides an optional implementation method. Figure 2 As shown, the method for detecting burnt pots includes:

[0082] S210. After the smoke machine starts working, the negative ion module is activated, and the first emitting device and the second emitting device are controlled to work alternately at a set interval.

[0083] S220. The signal receiving device receives the overall first signal intensity of the oil fume particles after being scattered by the first wavelength of the transmitted signal and the overall second signal intensity after being scattered by the second wavelength of the transmitted signal.

[0084] S230. Determine the carbonized particulate matter concentration corresponding to the overall first signal intensity and the overall second signal intensity, and determine the corresponding particulate matter concentration rise rate and carbonized particulate matter percentage based on the carbonized particulate matter concentration.

[0085] Specifically, the intensity of the carbonized particulate matter scattering signal and the intensity of the oil droplet scattering signal received by the signal receiving device are determined based on the overall first signal intensity and the overall second signal intensity; the concentration of carbonized particulate matter corresponding to the carbonized particulate matter is determined based on the intensity of the carbonized particulate matter scattering signal and the intensity of the oil droplet scattering signal.

[0086] Furthermore, before determining the corresponding particle concentration rise rate and carbonized particle proportion based on the carbonized particle concentration, the oil droplet particle concentration corresponding to the oil droplet particle is determined based on the overall first signal intensity and the overall second signal intensity; furthermore, the corresponding carbonized particle proportion is determined based on the carbonized particle concentration and the oil droplet particle concentration.

[0087] S240. Obtain the current bottom temperature of the pot, determine the corresponding temperature rise rate based on the current bottom temperature of the pot, and determine whether there is a risk of the pot burning.

[0088] The current bottom temperature of the cookware refers to the temperature of the bottom of the cookware detected in real time. The current bottom temperature of the cookware can be obtained through temperature detection methods such as the temperature sensor in the center of the cookware, the temperature detection function built into the cookware, or the infrared temperature sensing function built into the range hood. This embodiment does not impose any special restrictions on the specific method of obtaining the bottom temperature of the cookware.

[0089] Specifically, the risk of scorching is determined by whether the current bottom temperature of the pot is greater than or equal to the scorching threshold temperature. If the current bottom temperature of the pot is greater than or equal to the scorching threshold temperature, it is determined that the current pot is at risk of scorching. If the current bottom temperature of the pot is less than the scorching threshold temperature, the bottom temperature of the pot is monitored.

[0090] The scorch threshold temperature can be selected and set according to the scorch detection requirements. Different values ​​can be set for different recipes. For example, if the recipe is for vegetables, the scorch threshold temperature can be set lower because vegetables are more prone to scorching. Conversely, if the recipe is for meat, the scorch threshold temperature can be set relatively higher.

[0091] As we know, during stir-frying or high-heat cooking, the user continuously stirs the ingredients in the pot, causing their position to constantly change. The ingredients are generally in a state of even heating equilibrium. These cooking actions usually don't last long, so the pot's temperature doesn't rise continuously. Furthermore, during deep-frying, the large amount of oil in the pot continuously absorbs heat from the bottom, keeping the pot's bottom temperature relatively stable. However, in cases of scorching, the ingredients haven't moved sufficiently and can't absorb enough heat from the bottom. The pot's bottom temperature then remains elevated without significant fluctuations. Therefore, by observing the rate of temperature rise at the bottom of the pot, one can determine whether the pot is scorched.

[0092] The temperature rise rate is used to reflect the current temperature change at the bottom of the cookware. The temperature rise rate is determined by the temperature difference at the bottom collected at the set time interval and the set time interval. Specifically: K = ΔT / t0, where K is the temperature rise rate, ΔT is the temperature difference at the bottom collected at the set time interval, and t0 is the set time length. The larger the temperature rise rate, the faster the temperature rises.

[0093] Based on the above, in some misjudgment actions (such as stir-frying, deep-frying, and quick-frying), the temperature of the cookware may rise rapidly. In order to distinguish this from scorching, it is necessary to confirm the temperature fluctuation. Specifically: if the temperature rise rate is less than the temperature rate threshold, it means that the temperature is within the normal fluctuation range and the risk of scorching is low. The concentration of carbonized particles corresponding to the carbonized particles should be obtained again. If the temperature rise rate is greater than or equal to the temperature rate threshold, it means that the temperature is rising continuously and the risk of scorching is high. In this case, the concentration of carbonized particles should be determined based on the proportion of carbonized particles to determine whether the cookware is scorching.

[0094] The temperature rate threshold is selected and set based on the obvious difference in particulate matter concentration between the scorching and the false judgment action. In this embodiment, no special restrictions are placed on the specific value of the temperature rate threshold.

[0095] S250. After determining that there is a risk of scorching in the current cookware, determine whether the current cookware will scorch based on the rate of temperature rise, the concentration of carbonized particles, the rate of increase of particle concentration, and the proportion of carbonized particles.

[0096] Understandably, in one embodiment, whether the current cookware is burning can be determined mainly by three conditions: the first condition is that the concentration of carbonized particles is greater than or equal to a particle concentration threshold and / or the rate of increase of particle concentration is greater than or equal to a concentration rate threshold; the second condition is that the rate of increase of temperature is greater than or equal to a temperature rate threshold; and the third condition is that the proportion of carbonized particles is greater than or equal to a particle concentration proportion threshold. All three conditions can be determined simultaneously, specifically: if the concentration of carbonized particles is greater than or equal to a particle concentration threshold and / or the rate of increase of particle concentration is greater than or equal to a concentration rate threshold, the rate of increase of temperature is greater than or equal to a temperature rate threshold, and the proportion of carbonized particles is greater than or equal to a particle concentration proportion threshold, then... If any one of the following conditions is met, it is determined that the current cookware has not scorched and the risk of scorching is low. If any two of the following conditions are met: the carbonized particulate matter concentration is greater than or equal to the particulate matter concentration threshold and / or the particulate matter concentration rise rate is greater than or equal to the concentration rate threshold, the temperature rise rate is greater than or equal to the temperature rate threshold, and the carbonized particulate matter percentage is greater than or equal to the particulate matter concentration percentage threshold, it is determined that the current cookware has scorched and the risk of scorching is high. If the carbonized particulate matter concentration is greater than or equal to the particulate matter concentration threshold and / or the particulate matter concentration rise rate is greater than or equal to the concentration rate threshold, the temperature rise rate is greater than or equal to the temperature rate threshold, and the carbonized particulate matter percentage is greater than or equal to the particulate matter concentration percentage threshold, it is determined that the current cookware has scorched.

[0097] The technical solution of this invention obtains the current bottom temperature of the cookware, determines the corresponding temperature rise rate based on the current bottom temperature, and judges whether there is a risk of scorching in the cookware. This helps cooks to control the heat more accurately, thereby avoiding food burning and improving cooking results. Furthermore, after judging that there is a risk of scorching in the cookware, it determines whether the cookware will burn based on the temperature rise rate, carbonized particulate matter concentration, particulate matter concentration rise rate, and carbonized particulate matter percentage. This achieves precise temperature control, improves taste, protects the cookware, and reduces health risks, thus realizing scientific cooking.

[0098] Based on the above embodiments, Figure 3 This is a flowchart illustrating a method for detecting burnt pot contents according to an embodiment of the present invention. It simultaneously determines whether the pot is burnt based on three conditions, comprehensively assessing the burnt situation. Compared to using only a single condition, the multi-condition approach provides more accurate particulate matter detection results and greater flexibility, offering an optional implementation method. For example... Figure 3 As shown, the method for detecting burnt pots includes:

[0099] S310. After the smoke machine starts working, the negative ion module is activated, and the first and second emitting devices are controlled to work alternately at a set interval.

[0100] In this embodiment, a negative ion module is used to transform the originally small carbonized particles into particle clusters, making them detectable by the infrared signals of the first and second emitting devices. Subsequently, by utilizing the different absorption rates of carbonized particles and oil droplets at different signal wavelengths, the two can be distinguished, and the corresponding particle concentrations can be calculated separately. This results in a coke oven detection device that is smaller in size, lower in cost, and has higher overall stability.

[0101] S311. The signal receiving device is used to receive the overall first signal intensity of oil fume particles after being scattered by the first wavelength of the transmitted signal and the overall second signal intensity after being scattered by the second wavelength of the transmitted signal.

[0102] S312. Determine the intensity of the carbonized particulate scattering signal and the intensity of the oil droplet scattering signal received by the signal receiving device based on the overall first signal intensity and the overall second signal intensity.

[0103] S313. Determine the carbonized particle concentration corresponding to the carbonized particles based on the scattering signal intensity of the carbonized particles and the scattering signal intensity of the oil droplets.

[0104] S314. Determine the concentration of oil droplets corresponding to the overall first signal intensity and the overall second signal intensity.

[0105] Based on the above, the concentration of oil droplets can be obtained indirectly to understand the oil content in the user's food. This information can then be used to provide health advice to the user. If it is found that the user's food contains too much oil recently, a reminder can be given to the user to pay attention to a healthy diet.

[0106] S315. Determine the corresponding rate of increase in particulate matter concentration based on the concentration of carbonized particulate matter, and determine the corresponding proportion of carbonized particulate matter based on the concentration of carbonized particulate matter and the concentration of oil droplets.

[0107] S320. Obtain the current bottom temperature of the pot and determine the corresponding temperature rise rate based on the current bottom temperature of the pot.

[0108] This embodiment combines the different temperature fluctuations at the bottom of the pot during normal cooking and when the pot is scorched. During normal cooking, the temperature fluctuates up and down, while when the pot is scorched, it rises continuously. By observing the different rates of temperature rise, the situation of scorching can be determined, thus avoiding misjudgment of scorching.

[0109] S330. Determine whether there is a risk of burning the pot based on the current bottom temperature. If yes, proceed to step S340; otherwise, proceed to step S320.

[0110] Specifically, if the current bottom temperature of the pot is lower than the scorching threshold temperature, then the current bottom temperature of the pot will continue to be detected, and the process will return to step S320.

[0111] S340. After determining that there is a risk of scorching in the current cookware, determine whether the current cookware will scorch based on the rate of temperature rise, the concentration of carbonized particles, the rate of increase of particle concentration, and the proportion of carbonized particles.

[0112] Specifically, if the current temperature at the bottom of the cookware is greater than or equal to the scorching threshold temperature, it is determined that the current cookware is at risk of scorching. The scorching is then determined by combining the temperature rise rate, carbonized particulate matter concentration, particulate matter concentration rise rate, and carbonized particulate matter percentage.

[0113] Specifically: if the carbonized particulate matter concentration is greater than or equal to the particulate matter concentration threshold and / or the particulate matter concentration rise rate is greater than or equal to the concentration rate threshold, the temperature rise rate is greater than or equal to the temperature rate threshold, and the carbonized particulate matter percentage is greater than or equal to the particulate matter concentration percentage threshold, then it is determined that the current cookware has not scorched and the risk of scorching is low; if the carbonized particulate matter concentration is greater than or equal to the particulate matter concentration threshold and / or the particulate matter concentration rise rate is greater than or equal to the concentration rate threshold, the temperature rise rate is greater than or equal to the temperature rate threshold, and the carbonized particulate matter percentage is greater than or equal to the particulate matter concentration percentage threshold, then it is determined that the current cookware has scorched and the risk of scorching is high; if the carbonized particulate matter concentration is greater than or equal to the particulate matter concentration threshold and / or the particulate matter concentration rise rate is greater than or equal to the concentration rate threshold, the temperature rise rate is greater than or equal to the temperature rate threshold, and the carbonized particulate matter percentage is greater than or equal to the particulate matter concentration percentage threshold, then it is determined that the current cookware has scorched.

[0114] The technical solution of this invention combines multiple conditions, such as the rate of temperature rise, the concentration of carbonized particles, the rate of increase in particle concentration, and the proportion of carbonized particles, to comprehensively assess the situation of the scorched pot and adopt different response plans according to different risks. Compared with using only a single condition for judgment, the detection results of this invention, with the combination of multiple conditions, are more accurate and more flexible. At the same time, it can also make certain compensations for the calculation of oil fume particle concentration according to different temperature conditions, which is more in line with the actual situation.

[0115] Based on the above embodiments, Figure 4 This is a flowchart illustrating a method for detecting burnt pots according to an embodiment of the present invention. It sequentially determines whether the pot has burnt pot characteristics based on the three conditions described above, improving the efficiency and flexibility of burnt pot detection and providing an optional implementation method. For example... Figure 4 As shown, the method for detecting burnt pots includes:

[0116] S410. After the smoke machine starts working, the negative ion module is activated, and the first and second emitting devices are controlled to work alternately at a set interval.

[0117] S411. The signal receiving device is used to receive the overall first signal intensity of oil fume particles after being scattered by the first wavelength of the transmitted signal and the overall second signal intensity after being scattered by the second wavelength of the transmitted signal.

[0118] S412. Determine the intensity of the carbonized particulate scattering signal and the intensity of the oil droplet scattering signal received by the signal receiving device based on the overall first signal intensity and the overall second signal intensity.

[0119] S413. Determine the carbonized particulate concentration based on the scattering signal intensity of carbonized particulates and the scattering signal intensity of oil droplets.

[0120] S414. Determine the concentration of oil droplets corresponding to the overall first signal intensity and the overall second signal intensity.

[0121] Based on the above, the concentration of oil droplets can be obtained indirectly to understand the oil content in the user's food. This information can then be used to provide health advice to the user. If it is found that the user's food contains too much oil recently, a reminder can be given to the user to pay attention to a healthy diet.

[0122] S415. Determine the corresponding rate of increase in particulate matter concentration based on the concentration of carbonized particulate matter, and determine the corresponding proportion of carbonized particulate matter based on the concentration of carbonized particulate matter and the concentration of oil droplets.

[0123] S420. Obtain the current bottom temperature of the pot and determine the corresponding temperature rise rate based on the current bottom temperature of the pot.

[0124] S430. Determine whether there is a risk of burning the pot based on the current bottom temperature. If yes, proceed to step S440; otherwise, proceed to step S420.

[0125] Specifically, if the current bottom temperature of the pot is lower than the scorching threshold temperature, then the current bottom temperature of the pot will continue to be detected, and the process will return to step S420.

[0126] S440. After determining that there is a risk of scorching in the current cookware, determine whether the concentration of carbonized particulate matter is greater than or equal to the particulate matter concentration threshold, and / or whether the rate of increase of particulate matter concentration is greater than or equal to the concentration rate threshold. If yes, proceed to step S450; otherwise, proceed to step S412.

[0127] Specifically, if the current temperature at the bottom of the cookware is greater than or equal to the scorching threshold temperature, it is determined that the current cookware is at risk of scorching. The scorching is then determined by combining the temperature rise rate, carbonized particulate matter concentration, particulate matter concentration rise rate, and carbonized particulate matter percentage.

[0128] If the carbonized particulate matter concentration is greater than or equal to the particulate matter concentration threshold and the particulate matter concentration rise rate is greater than or equal to the concentration rate threshold, or if the carbonized particulate matter concentration is greater than or equal to the particulate matter concentration threshold, or if the particulate matter concentration rise rate is greater than or equal to the concentration rate threshold, then it is necessary to further determine whether a scorching situation has occurred based on other judgment conditions, i.e., execute step S450.

[0129] Conversely, if the concentration of carbonized particulate matter is less than the particulate matter concentration threshold and the rate of increase of particulate matter concentration is less than the concentration rate threshold, then return to step S412, that is, re-obtain the carbonized particulate matter concentration corresponding to the carbonized particulate matter.

[0130] S450. Determine whether the temperature rise rate is greater than or equal to the temperature rate threshold. If yes, proceed to step S460; otherwise, proceed to step S413.

[0131] Specifically, if the rate of temperature rise is less than the temperature rate threshold, it indicates that the temperature is within the normal fluctuation range and the risk of scorching is low. In this case, the process returns to step S413, which involves re-acquiring the concentration of carbonized particulate matter corresponding to the carbonized particulate matter.

[0132] If the rate of temperature rise is greater than or equal to the temperature rate threshold, it indicates that the temperature is rising continuously and the risk of scorching is high. In this case, continue to determine whether the pot will scorch based on the proportion of carbonized particles, i.e., proceed to step S460.

[0133] Additionally, it should be noted that the temperature rise rate is used to reflect whether the current pot temperature is rising rapidly. Not only can a single temperature rise rate be used for comparison to determine if scorching has occurred, but the temperature rise rate can also be continuously acquired. Based on whether the temperature rise rate is consistently high (i.e., multiple detections of a temperature rise rate greater than or equal to a temperature rate threshold), the number of times the temperature rise rate is greater than or equal to the temperature rate threshold, as well as the number of times the temperature rise rate is less than the temperature rate threshold, can be counted. Based on the percentage of temperature rise rates greater than or equal to the temperature rate threshold, it can be determined whether the pot is scorching. If the percentage of temperature rise rates greater than or equal to the temperature rate threshold is significantly higher than the percentage of temperature rise rates less than the temperature rate threshold, it indicates that the condition for a sustained temperature rise is met. Conversely, if the two percentages are roughly equal, it indicates that the temperature is fluctuating and the condition for a sustained temperature rise is not met. In summary, this embodiment does not restrict the specific method for determining whether a consistently high temperature rise rate is valid.

[0134] S460. Determine whether the proportion of carbonized particulate matter is greater than or equal to the particulate matter concentration proportion threshold. If yes, proceed to step S461; otherwise, proceed to step S462.

[0135] S461. Confirm that the current cookware is burnt.

[0136] Specifically, if the proportion of carbonized particulate matter is greater than or equal to the particulate matter concentration threshold, it indicates that the risk of scorching is already very high. In this case, the scorching situation can be addressed by appropriately lowering the stove's heat, increasing the range hood's airflow, or issuing a scorching alarm to the user.

[0137] S462. Confirm that the current cookware has not burned.

[0138] Specifically, if the proportion of carbonized particulate matter is less than the particulate matter concentration threshold, it cannot be determined that scorching has occurred. In this case, although the possibility of scorching is high, it cannot be completely confirmed. A prompt can be issued to remind the user to adjust the temperature and stir the food in time to avoid scorching.

[0139] The technical solution of this invention determines the scorching of the pot based on multiple conditions, such as the rate of temperature rise, the concentration of carbonized particles, the rate of increase in particle concentration, and the proportion of carbonized particles. Different solutions are adopted according to different risks of scorching. Compared with the judgment based on a single condition, the scorching detection results of this invention are more accurate under the combination of multiple conditions. The sequential judgment of multiple conditions balances readability, efficiency, and flexibility through structured design. At the same time, it can also make certain compensations for the calculation of oil fume particle concentration based on the different temperatures at the bottom of the pot, which is more in line with the actual situation.

[0140] Based on the above embodiments, Figure 5 This is a schematic diagram of a scorch pot detection device provided in an embodiment of the present invention. See also: Figure 5 As shown, the scorched pot detection device 100 includes a fan 120, a negative ion module 110 disposed in front of the fan 120, a channel valve 130, a particulate matter detection channel 133, a first emitting device 131 and a second emitting device 132 disposed in the particulate matter detection channel 133, and a signal receiving device 134. The negative ion module 110 is used to generate negative oxygen ions to cause the oil fume particles to aggregate. The first emitting device 131 is used to generate a first wavelength emission signal, the second emitting device 132 is used to generate a second wavelength emission signal, and the signal receiving device 134 is used to receive the scattered signal of the oil fume particles. The scorched pot detection device 100 is used to implement the scorched pot detection method provided in any embodiment of the present invention.

[0141] The working principle of the negative ion module 110 is mainly based on the physical process of generating negative oxygen ions 11 by high-voltage ionization of air, actively purifying the air by releasing charged negative ions. In a range hood, the negative ion module 110 plays two main roles: First, it causes some tiny particles in cooking fumes (such as tiny oil droplets and carbonized particles) to become negatively charged. These charged particles are more likely to attract other particles and aggregate, forming larger particle clusters. These larger clusters are more easily captured by the filter inside the range hood, resulting in better purification of cooking fumes and particles. Second, it eliminates odors produced during cooking. The components that produce odors during cooking (such as aldehydes and amines) mainly carry positive charges. After combining with the negative oxygen ions 111 emitted by the negative ion module 110, some odor components become deactivated, while others are adsorbed onto other particles and ultimately captured by the range hood filter. This effectively removes pungent odors from cooking fumes, resulting in a better user experience.

[0142] In this embodiment, the negative ion module 110, through its first function, aggregates previously difficult-to-detect carbonized particles into large particle clusters, rapidly increasing the overall particle size. This allows for detection and differentiation under the different wavelengths emitted by the first and second emitting devices 131 and 132. However, under the influence of the negative ion module 110, many carbonized particles adsorb with other small oil droplets, forming composite particle clusters. In this case, the first and second emitting devices 131 and 132 can only detect the particle clusters and larger oil droplets in the fumes as a whole, failing to distinguish between carbonized particles and oil droplets. Therefore, relying solely on the overall detection results of the first and second emitting devices 131 and 132 to determine the scorched pot will increase the probability of misjudgment and fail to achieve the desired scorched pot detection effect.

[0143] Based on the above, please continue to refer to Figure 4 The scorched pot detection device 100 shown operates as follows: The oil fumes generated inside the pot first pass through the negative oxygen ions 111 emitted by the negative ion module 110, completing the particulate matter aggregation process. Then, driven by the fan 120, they enter the particulate matter detection channel 133. The particulate matter detection channel 133 is also equipped with a channel valve 130, which controls the opening and closing of the channel. After passing through the channel valve 130, the oil fumes enter the receiving area of ​​the first emitting device 131 and the second emitting device 132. This allows for the differentiation of carbonized particulate matter and oil droplets by utilizing the different absorption rates at different signal wavelengths, and the corresponding particulate matter concentrations can be calculated separately.

[0144] Furthermore, in the particulate matter detection channel 133, after the oil fume passes through the channel valve 130, the laser drive circuit of the smoke machine or the laser drive circuit built into the scorch pot detection device 100 can control the first emitting device 131 and the second emitting device 132 to generate two infrared signals of different wavelengths. These signals are then transmitted back and forth to the receiving range of the first emitting device 131 and the second emitting device 132. The signal receiving device 134 receives the scattered signals of oil fume particles with a particle size in the range of 0.3μm to 1.0μm. It is known that the signal receiving device 134 has a signal processing circuit that can process and analyze the scattered signals. The signal receiving device 134 can process the received scattered signals of oil fume particles to calculate the concentration of oil fume particles with a particle size in the range of 0.3μm to 1.0μm.

[0145] Based on the above, after obtaining the concentration of oil fume particles with a particle size in the range of 0.3μm to 1.0μm through the particulate matter detection channel 133, the range hood can also determine whether there is a scorching problem.

[0146] Based on the above embodiments, Figure 5 This is a front perspective view of a smoke hood provided in an embodiment of the present invention. Figure 6 This is a side perspective view of a smoke hood provided in an embodiment of the present invention. The smoke hood includes a scorch pot detection device 100 according to any embodiment of the present invention.

[0147] See Figure 5 and Figure 6 As shown, it can be understood that the scorch detection device 100 in this embodiment is installed inside the range hood to directly obtain information about the oil fumes generated during cooking. Figure 5 and Figure 6 The 100-unit detection device for the burnt pot is not visible from outside the range hood, and... Figure 5 and Figure 6 The installation position of the coke pot detection device 100 is for reference only. That is, this embodiment does not impose any restrictions on the specific installation position or installation method of the coke pot detection device module 100.

[0148] In addition, the scorch pot detection device 100 can be part of the range hood, that is, it can be an integrated design with the range hood, or it can be a separate scorch pot detection device in the above embodiment, which is used in conjunction with the range hood. The above can be set according to the specific model of the range hood and the user's needs. This embodiment does not limit this.

[0149] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0150] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for detecting burnt pots, characterized in that, The method for detecting scorched oil fume is applied to a range hood. The range hood includes a negative ion module, a first emitting device, a second emitting device, and a signal receiving device. The negative ion module generates negative oxygen ions to cause the oil fume particles to aggregate. The first emitting device generates a first wavelength emission signal, the second emitting device generates a second wavelength emission signal, and the signal receiving device receives the scattered signal from the oil fume particles. The method for detecting scorched oil fume includes: After the range hood starts working, the negative ion module is activated, and the first emitting device and the second emitting device are controlled to work alternately at set intervals. The signal receiving device is used to receive the overall first signal intensity of the oil fume particles after being scattered by the first wavelength of the emitted signal and the overall second signal intensity after being scattered by the second wavelength of the emitted signal. The carbonized particulate matter concentration corresponding to the carbonized particulate matter is determined based on the overall first signal intensity and the overall second signal intensity, and the corresponding particulate matter concentration rise rate and carbonized particulate matter percentage are determined based on the carbonized particulate matter concentration. Whether the cookware is burning is determined based on the concentration of carbonized particles, the rate of increase of the particle concentration, and the proportion of carbonized particles.

2. The method for detecting burnt pots according to claim 1, characterized in that, Determining the carbonized particulate matter concentration corresponding to the carbonized particulate matter based on the overall first signal intensity and the overall second signal intensity includes: The intensity of the carbonized particulate scattering signal and the intensity of the oil droplet particulate scattering signal received by the signal receiving device are determined based on the overall first signal intensity and the overall second signal intensity. The concentration of carbonized particles corresponding to the carbonized particles is determined based on the scattering signal intensity of the carbonized particles and the scattering signal intensity of the oil droplets.

3. The method for detecting burnt pots according to claim 1, characterized in that, Before determining the corresponding particulate matter concentration rise rate and the proportion of carbonized particulate matter based on the carbonized particulate matter concentration, the method further includes: The concentration of oil droplets corresponding to the overall first signal intensity and the overall second signal intensity are determined. Determining the corresponding percentage of carbonized particulate matter based on the concentration of carbonized particulate matter includes: The corresponding proportion of carbonized particles is determined based on the concentration of carbonized particles and the concentration of oil droplets.

4. The method for detecting burnt pots according to claim 1, characterized in that, Before determining whether the cookware is burning based on the carbonized particulate matter concentration, the rate of increase of the particulate matter concentration, and the proportion of carbonized particulate matter, the process further includes: The current bottom temperature of the pot is obtained, and the corresponding temperature rise rate is determined based on the current bottom temperature of the pot, as well as whether there is a risk of the pot burning. Determining whether the cookware is burning based on the carbonized particulate matter concentration, the rate of increase of the particulate matter concentration, and the proportion of carbonized particulate matter includes: After determining that the current cookware has a risk of scorching, the determination of whether the current cookware will scorch is based on the temperature rise rate, the carbonized particulate matter concentration, the particulate matter concentration rise rate, and the carbonized particulate matter percentage.

5. The method for detecting burnt pots according to claim 4, characterized in that, Determining whether there is a risk of burning the cookware based on the current bottom temperature includes: If the current bottom temperature of the cookware is greater than or equal to the scorching threshold temperature, it is determined that the current cookware is at risk of scorching. If the current bottom temperature of the pot is lower than the scorching threshold temperature, the bottom temperature of the pot will continue to be detected.

6. The method for detecting burnt pots according to claim 4, characterized in that, Determining whether the cookware is burning based on the temperature rise rate, the carbonized particulate matter concentration, the particulate matter concentration rise rate, and the carbonized particulate matter percentage includes: If the concentration of carbonized particulate matter is greater than or equal to the particulate matter concentration threshold, and / or the rate of increase of the particulate matter concentration is greater than or equal to the concentration rate threshold, then it is determined whether the current cookware is scorched based on the proportion of carbonized particulate matter and the rate of increase of temperature. If the concentration of carbonized particulate matter is less than the particulate matter concentration threshold, and the rate of increase of particulate matter concentration is less than the concentration rate threshold, then the concentration of carbonized particulate matter corresponding to the carbonized particulate matter is re-acquired.

7. The method for detecting burnt pots according to claim 6, characterized in that, Determining whether the current cookware is burning based on the proportion of carbonized particles and the rate of temperature rise includes: If the temperature rise rate is less than the temperature rate threshold, the carbonized particulate matter concentration corresponding to the carbonized particulate matter is re-acquired. If the temperature rise rate is greater than or equal to the temperature rate threshold, and the carbonized particulate matter ratio is greater than or equal to the particulate matter concentration ratio threshold, then it is determined that the current cookware has scorched. If the rate of temperature rise is greater than or equal to the temperature rate threshold, and the proportion of carbonized particles is less than the proportion of particle concentration threshold, then it is determined that the current cookware has not scorched.

8. The method for detecting burnt pots according to claim 4, characterized in that, Determining whether the cookware is burning based on the temperature rise rate, the carbonized particulate matter concentration, the particulate matter concentration rise rate, and the carbonized particulate matter percentage includes: If any of the following conditions are met: the carbonized particulate matter concentration is greater than or equal to the particulate matter concentration threshold and / or the particulate matter concentration rise rate is greater than or equal to the concentration rate threshold, the temperature rise rate is greater than or equal to the temperature rate threshold, and the carbonized particulate matter proportion is greater than or equal to the particulate matter concentration proportion threshold, then it is determined that the current cookware has not scorched and the risk of scorching is low. If any two of the following conditions are met: the carbonized particulate matter concentration is greater than or equal to the particulate matter concentration threshold and / or the particulate matter concentration rise rate is greater than or equal to the concentration rate threshold, the temperature rise rate is greater than or equal to the temperature rate threshold, and the carbonized particulate matter proportion is greater than or equal to the particulate matter concentration proportion threshold, then it is determined that the current cookware has not produced a burnt pot, but the risk of burnt pot is high. If the concentration of carbonized particulate matter is greater than or equal to the particulate matter concentration threshold and / or the rate of increase of particulate matter concentration is greater than or equal to the concentration rate threshold, the rate of increase of temperature is greater than or equal to the temperature rate threshold, and the proportion of carbonized particulate matter is greater than or equal to the proportion of particulate matter concentration threshold, then it is determined that the current cookware has scorched.

9. A device for detecting burnt pots, characterized in that, The scorched pot detection device includes a fan, a negative ion module disposed in front of the fan, a channel valve, a particulate matter detection channel, a first emitting device and a second emitting device disposed in the particulate matter detection channel, and a signal receiving device. The negative ion module is used to generate negative oxygen ions to cause the oil fume particles to aggregate. The first emitting device is used to generate a first wavelength emission signal, the second emitting device is used to generate a second wavelength emission signal, and the signal receiving device is used to receive the scattered signal of the oil fume particles. The scorched pot detection device is used to implement the scorched pot detection method according to any one of claims 1-8.

10. A range hood, characterized in that, The smoke machine includes the scorch pot detection device as described in claim 9.

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