Smoke exhaust system applied to intelligent cooker

Abstract

The application provides a smoke exhaust system applied to an intelligent cooker. The intelligent cooker comprises a cooking container, a stove assembly and a pot cover assembly. The smoke exhaust system comprises a smoke exhaust module arranged on the pot cover assembly and a control module. The smoke exhaust module comprises an air flow generating device and a smoke exhaust channel. The stove assembly comprises a heating device. The air flow generating device and the heating device are electrically connected with the control module. The control module determines a first air flow parameter required for smoke exhaust and a second air flow parameter required for temperature control based on temperature information, fuses to obtain a target air flow parameter, determines a heating power compensation amount according to additional convection heat dissipation caused by deviation of the target air flow parameter from the second air flow parameter and response delay of the heating device, and synchronously controls the air flow generating device and the heating device. The application can reduce the influence of air flow change and heating response delay on cooking temperature while maintaining the smoke exhaust capacity.

Description

Technical Field

[0001] This invention relates to the field of intelligent cooking appliances and their smoke control technology, and particularly to a smoke exhaust system applied to intelligent cooking appliances. Background Technology

[0002] With the development of intelligent cooking equipment, fume extraction technology has gradually evolved from external suction and exhaust to near-source integration with the cookware and coordinated operation of the range hood and stove. Patent application CN201911013507.X discloses a fume treatment system for cooking equipment, which improves the problem of fume dispersion by forming a fume collection and purification path through the pot lid exhaust vent, hollow pot lid shaft, smoke guide pipe, and fan. Subsequently, patent application CN201611114484.8 disclosed a temperature measurement method for cooking pots, cooking pots, and a cooking system. This system adjusts the range hood speed and stove heat in conjunction with the actual temperature of the pot and the cooking mode, transforming fume extraction and heating from independent operation to coordinated regulation based on temperature information.

[0003] However, the aforementioned solutions focus on either the fume collection structure or matching the operating status of the range hood and cooktop according to temperature and mode. When the exhaust airflow near the pot lid increases, the convective heat transfer between the cooking container and the environment also intensifies. Existing solutions have not quantified and integrated the fume extraction and temperature control requirements, nor have they implemented power compensation based on the actual convective heat loss and heating device response delay caused by the deviation between the two. Therefore, temperature drops, overshoots, or oscillations may occur.

[0004] In view of this, there is an urgent need for smoke extraction systems to be applied to smart cooking appliances in order to at least address the above-mentioned shortcomings. Summary of the Invention

[0005] One of the objectives of this invention is to provide a smoke extraction system for smart cookers to solve the problems mentioned in the background art.

[0006] The smoke extraction system for smart cookers provided in this embodiment of the invention utilizes a cooking container, a cooktop assembly for heating the cooking container, and a lid assembly. The smoke extraction system includes a smoke extraction module and a control module disposed on the lid assembly. The smoke extraction module includes an airflow generating device and a smoke extraction channel. The cooktop assembly includes a heating device. Both the airflow generating device and the heating device are electrically connected to the control module. The control module includes a temperature information acquisition module, an airflow parameter determination module, and a heating compensation parameter determination module. The temperature information acquisition module is used to acquire temperature information reflecting the temperature of the cooking container; The airflow parameter determination module is used to determine the first airflow parameter required to exhaust the fumes generated during cooking based on the temperature information; and to determine the second airflow parameter required to bring the temperature of the cooking container toward the preset target temperature based on the deviation between the temperature information and the preset target temperature. The heating compensation parameter determination module is used to integrate the first airflow parameter and the second airflow parameter to determine the target airflow parameter to be executed by the airflow generating device; and to determine the heating power compensation amount of the heating device in the stove assembly based on the deviation of the target airflow parameter from the second airflow parameter. The control module is also used to control the airflow generator to operate according to the target airflow parameters in order to exhaust oil fumes; and to control the heating device to adjust the heating power according to the heating power compensation amount, so that the airflow generator and the heating device work together to increase the temperature of the cooking container.

[0007] Preferably, the temperature information acquisition module performs the following operations: The current operating heating power and heating duration of the heating device in the cooktop assembly are obtained. Based on the current operating heating power, heating duration, and the thermodynamic parameters of the cooking container stored in the system, the temperature information is estimated. And / or, Temperature information is obtained by acquiring the temperature distribution of different areas of the cooking container through an array of temperature measuring units set on the lid assembly and facing the cooking container.

[0008] Preferably, determining the first airflow parameter includes: The temperature information is compared with multiple preset temperature ranges to determine the target temperature range in which the temperature information is located. Based on the first airflow mapping relationship between the preset temperature range and the airflow parameters required for fume exhaust, the first airflow parameters corresponding to the target temperature range are obtained.

[0009] Preferably, determining the second airflow parameters includes: Calculate the deviation between the temperature information and the preset target temperature, and determine the second airflow parameter based on the deviation and the preset airflow adjustment coefficient; And / or, Based on the temperature information obtained at the current moment and the temperature information obtained at historical moments, the rate of change of the temperature information is calculated; before the temperature information reaches the preset target temperature, the second airflow parameter is adjusted in advance according to the direction and magnitude of the rate of change, so that the direction of airflow adjustment is opposite to the trend of the temperature continuing to deviate from the preset target temperature. And / or, The system obtains the user-defined cooking mode or preset temperature setting, predicts the temperature change trend based on the preset temperature change trend model corresponding to the cooking mode or preset temperature setting, and adjusts the second airflow parameter in advance according to the predicted change direction and degree, so that the airflow adjustment direction is opposite to the predicted temperature deviation trend.

[0010] Preferably, determining the target airflow parameter by integrating the first airflow parameter and the second airflow parameter includes: determining the larger value between the first airflow parameter and the second airflow parameter as the target airflow parameter; Determining the heating power compensation amount includes: determining the heating power compensation amount based on the difference between the target airflow parameter and the second airflow parameter and the preset power compensation coefficient; when the target airflow parameter is greater than the second airflow parameter, increasing the heating power to compensate for the increased convective heat dissipation caused by the target airflow parameter exceeding the second airflow parameter; when the target airflow parameter is equal to the second airflow parameter, no additional heating power compensation is generated due to airflow deviation.

[0011] Preferably, the heating power compensation amount of the heating device in the cooktop assembly is determined based on the deviation of the target airflow parameter from the second airflow parameter, including: Extract the target airflow parameters and the second airflow parameters, calculate the difference between them, and obtain the airflow deviation; the airflow deviation is used to characterize the degree to which the target airflow parameters are higher than the second airflow parameters in order to meet the smoke exhaust requirements; Acquire temperature information and a preset ambient reference temperature, and determine the real-time convective heat transfer gradient on the surface of the cooking container based on the difference between the two. Based on the correspondence between the pre-stored airflow parameters and the convective heat transfer coefficient, the airflow deviation is converted into the change in the convective heat transfer coefficient. Combined with the real-time convective heat transfer gradient and the effective heat exchange area of ​​the cooking container, the actual convective heat loss equivalent is determined. Obtain the power regulation response delay parameter of the heating device, estimate the heat deficit formed by the equivalent of actual convective heat loss during the response period of the heating device based on the response delay parameter, and determine the heating power compensation amount based on the heat deficit.

[0012] Preferably, determining the actual convective heat loss equivalent includes: Based on the airflow deviation, the change in convective heat transfer coefficient corresponding to the current airflow deviation is determined from the pre-stored correspondence between airflow parameters and convective heat transfer coefficients in the system. The additional convective heat dissipation power per unit area is determined by combining the real-time convective heat transfer gradient with the change in the convective heat transfer coefficient. The total theoretical heat loss is determined based on the additional convective heat dissipation power per unit area and the effective heat exchange area matching the current cooking container. Based on the current thermal inertia of the food being cooked, the total theoretical heat loss is smoothed to reduce the impact of short-term airflow fluctuations on the calculation results, thus obtaining the actual convective heat loss equivalent.

[0013] Preferably, determining the heating power compensation amount based on the power regulation response delay parameter includes: The power regulation response delay parameter corresponding to the current working state is obtained from the pre-stored heating device response characteristic parameter library of the system, and the number of control cycles covered by the response delay is determined according to the power regulation response delay parameter and the current working sampling period of the system. Estimate the heat deficit generated by the heating device during the response delay based on the actual convective heat loss equivalent. Based on the electrothermal conversion efficiency of the heating device under its current operating state, the heat deficit is converted into the required increase in heating power. By combining the current basic heating power and the upper limit of the rated power of the heating device, the required increase in heating power is limited, and the amount of heating power compensation is obtained.

[0014] Preferably, controlling the airflow generating device of the smoke exhaust module to operate according to the target airflow parameters includes: The airflow generating device is controlled to rotate forward or reverse according to control commands; And / or, The angle of the guide component on the air outlet side of the airflow generator of the exhaust module is controlled so that the airflow generated by the airflow generator switches between a first state of blowing towards the cooking container and a second state of being discharged towards the exhaust duct.

[0015] The smoke extraction system for smart cookers provided in this embodiment of the invention also performs the following operations: The human-computer interaction interface is used to acquire and record the user's manual correction operations on the target airflow parameters or heating power compensation amount; The parameters are updated based on the adjustment direction and frequency of the manual correction operation; wherein, the adjustment frequency is the number of manual corrections in the same direction counted in similar temperature ranges and the same cooking mode. When the adjustment frequency reaches a preset threshold, the first airflow mapping relationship and / or airflow adjustment coefficient are updated based on the corresponding manual correction amount for the determination of subsequent target airflow parameters and heating power compensation amount.

[0016] The beneficial effects of this invention are as follows: This invention incorporates a smoke extraction module on the lid assembly of a smart cooker, with a control module coordinating the airflow generator and heating device. The control module determines the first airflow parameter required for smoke extraction and the second airflow parameter required for temperature control, fusing them to obtain the target airflow parameter. When the smoke extraction demand causes the target airflow parameter to exceed the second airflow parameter, the control module determines the heating power compensation amount based on the additional convective heat dissipation caused by the increased airflow on the cooking container, and pre-determines the compensation amount in conjunction with the response delay of the heating device, thereby reducing the impact of smoke extraction airflow changes on the cooking temperature.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in this application.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram showing the connection relationship between the various components of the smart cooker, the smoke extraction module, and the control module in an embodiment of the present invention; Figure 2 This is a schematic diagram of the data flow in the process of determining the heating power compensation amount in an embodiment of the present invention. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] Example 1: This example provides a smoke extraction system for smart cookers, such as... Figure 1 As shown. The intelligent cooker includes a cooking container, a cooktop assembly for heating the cooking container, and a lid assembly; the exhaust system includes an exhaust module and a control module disposed on the lid assembly. The exhaust module includes an airflow generator and an exhaust duct. The cooktop assembly includes a heating device. Both the airflow generator and the heating device are electrically connected to the control module. The control module includes a temperature information acquisition module, an airflow parameter determination module, and a heating compensation parameter determination module, wherein: The temperature information acquisition module is used to acquire temperature information reflecting the temperature of the cooking container; The airflow parameter determination module is used to determine the first airflow parameter required to exhaust the fumes generated during cooking based on the temperature information; and to determine the second airflow parameter required to bring the temperature of the cooking container toward the preset target temperature based on the deviation between the temperature information and the preset target temperature. The heating compensation parameter determination module is used to integrate the first airflow parameter and the second airflow parameter to determine the target airflow parameter to be executed by the airflow generating device; and to determine the heating power compensation amount of the heating device in the stove assembly based on the deviation of the target airflow parameter from the second airflow parameter. The control module is also used to control the airflow generator to operate according to the target airflow parameters in order to exhaust oil fumes; and to control the heating device to adjust the heating power according to the heating power compensation amount, so that the airflow generator and the heating device work together to increase the temperature of the cooking container.

[0022] In this embodiment, the temperature information represents the quantified temperature result reflecting the current thermodynamic state of the cooking container. It can be a single-point temperature value or a temperature distribution covering different areas of the cooking container. It is the core input for subsequent airflow parameter determination and heating power compensation calculation.

[0023] In this embodiment, the first airflow parameter is the airflow control amount determined with the goal of exhausting cooking fumes, and its magnitude can be determined based on the current cooking temperature. The second airflow parameter is the airflow control amount determined with the goal of bringing the temperature of the cooking container toward a preset target temperature. These two parameters respectively reflect the fume extraction requirement and the temperature control requirement. The control module determines these two parameters separately and then merges them to consider the impact of airflow on the cooking temperature while meeting the fume extraction requirement.

[0024] In this embodiment, the target airflow parameter is the final execution quantity obtained by fusing the first airflow parameter and the second airflow parameter. It represents the instruction value actually issued by the system to the airflow generating device after comprehensively considering the smoke exhaust effect and temperature control stability.

[0025] In this embodiment, the heating power compensation amount represents the amount of adjustment required to the heating device power because the target airflow parameter is higher than the second airflow parameter required for temperature control. When the target airflow parameter is greater than the second airflow parameter, the increased airflow will cause additional convective heat dissipation, requiring an increase in heating power for compensation; when the target airflow parameter is equal to the second airflow parameter, the airflow deviation is zero, and no additional heating power compensation is generated due to this deviation.

[0026] The working principle and beneficial effects of the above technical solution are as follows: In this embodiment, the exhaust module is carried by the pot lid assembly, and the airflow generating device and the heating device are coordinated by the same control module. The temperature information acquisition module provides the temperature information of the cooking container, the airflow parameter determination module obtains the first airflow parameter required for exhaust and the second airflow parameter required for temperature control, respectively, and the heating compensation parameter determination module determines the adjustment direction and magnitude of the heating power based on the deviation between the target airflow parameter (after fusion of the two) and the second airflow parameter, so that the change in exhaust airflow and the adjustment of heating power are coordinated and executed in the same control process.

[0027] Example 2: Based on Example 1, the temperature information acquisition module performs the following operations: The current operating heating power and heating duration of the heating device in the cooktop assembly are obtained. Based on the current operating heating power, heating duration, and the thermodynamic parameters of the cooking container stored in the system, the temperature information is estimated. And / or, Temperature information is obtained by acquiring the temperature distribution of different areas of the cooking container through an array of temperature measuring units set on the lid assembly and facing the cooking container.

[0028] In this embodiment, the thermodynamic parameters are a set of parameters pre-stored in the system that describe the thermodynamic characteristics of a specific type of cooking container, including but not limited to specific heat capacity, thermal conductivity, and emissivity. The system establishes a thermal model of the cooking container based on these parameters, and then estimates the temperature by combining the current operating heating power and the heating time. This method is suitable for scenarios where temperature sensors cannot be directly deployed or the temperature sensors are malfunctioning, and it belongs to the category of soft measurement methods.

[0029] In this embodiment, the array-type temperature measurement unit is a temperature acquisition device composed of multiple temperature sensors arranged in a certain spatial layout. It can simultaneously acquire temperature values ​​of different areas of the cooking container, thus obtaining the temperature distribution rather than a single-point temperature. The temperature distribution can reflect the uniformity of heating of the cooking container, providing a basis for subsequent more refined thermal compensation calculations.

[0030] In this embodiment, "and / or" means that the two acquisition methods can be used individually or simultaneously for mutual verification. The system can adaptively select the acquisition path based on the sensor configuration and the current working state.

[0031] The working principle and beneficial effects of the above technical solution are as follows: This embodiment provides two parallel temperature information acquisition paths. The estimation method based on thermodynamic parameters requires no additional sensors; temperature can be calculated by recording heating power and duration, offering advantages such as low cost and high reliability, making it suitable for low-cost product forms. The array-based temperature measurement method directly reflects the actual temperature distribution of the cooking container, providing higher sensing accuracy and capturing local temperature differences caused by improper placement of cookware or uneven heat conduction at the bottom of the pot, making subsequent thermal compensation calculations more consistent with the actual thermodynamic state. The coexistence and fusion of these two methods ensure that the system can stably acquire temperature information under different hardware configurations, guaranteeing the input data quality of the entire control chain.

[0032] Example 3: Based on Example 1, the first airflow parameters are determined as follows: The temperature information is compared with multiple preset temperature ranges to determine the target temperature range in which the temperature information is located. Based on the first airflow mapping relationship between the preset temperature range and the airflow parameters required for fume exhaust, the first airflow parameters corresponding to the target temperature range are obtained.

[0033] In this embodiment, the temperature range is a temperature segment that the system predefines according to the generation pattern of cooking fumes. For example, it can be divided into a low-temperature preheating segment, a medium-temperature cooking segment, a high-temperature stir-frying segment, etc. Different temperature ranges correspond to different levels of fume generation intensity, so the demand for exhaust airflow is also different.

[0034] In this embodiment, the first airflow mapping relationship is a pre-stored rule in the system that maps temperature ranges to corresponding required airflow parameters. This rule can be represented as a lookup table, piecewise function, or interpolation curve. Through this mapping relationship, the system can quickly determine the required airflow rate for exhaust at the current temperature without performing complex real-time calculations. This results in low response latency and is suitable for embedded control scenarios.

[0035] The working principle and beneficial effects of the above technical solution are as follows: In this embodiment, the correspondence between cooking temperature and exhaust airflow demand is pre-stored as a first airflow mapping relationship. The exhaust airflow parameters at the current temperature are determined by interval lookup, thereby reducing the amount of real-time calculation. Dividing the temperature into multiple intervals can also reduce frequent changes in airflow commands caused by temperature fluctuations, ensuring that the exhaust airflow matches the exhaust demand corresponding to the current cooking temperature, and reducing the additional heat dissipation caused by excessive airflow.

[0036] Example 4: Based on Example 1, the second airflow parameters are determined as follows: Calculate the deviation between the temperature information and the preset target temperature, and determine the second airflow parameter based on the deviation and the preset airflow adjustment coefficient; And / or, Based on the temperature information obtained at the current moment and the temperature information obtained at historical moments, the rate of change of the temperature information is calculated, and the second airflow parameter is corrected in advance according to the rate of change before the temperature information reaches the preset target temperature. And / or, The system obtains the user-defined cooking mode or preset temperature setting, predicts the temperature change trend based on the preset temperature change trend model corresponding to the cooking mode or preset temperature setting, and corrects the second airflow parameter in advance based on the predicted change trend.

[0037] In this embodiment, the deviation value is the difference between the current temperature and the preset target temperature. When the current temperature is higher than the preset target temperature, the second airflow parameter can be increased to enhance convective heat dissipation; when the current temperature is lower than the preset target temperature, the second airflow parameter can be decreased to reduce convective heat dissipation. The airflow adjustment coefficient is used to convert the temperature deviation into a corresponding airflow adjustment amount, and can be preset according to different cooking scenarios.

[0038] In this embodiment, the rate of change of temperature information is obtained by subtracting the temperature information at adjacent sampling times and combining it with the sampling time interval, which is used to reflect how quickly the temperature of the cooking container rises or falls. When the temperature is approaching the target value at a relatively fast pace before reaching it, the control module pre-adjusts the second airflow parameter according to the direction and magnitude of the change, so that the airflow adjustment has a reverse effect on the continued temperature change, thereby reducing the possibility that the temperature will exceed the target value.

[0039] In this embodiment, the cooking mode or preset temperature setting is the cooking condition input by the user through the operation interface, such as "stir-frying", "simmering", or "pan-frying". The preset temperature change trend model is used to describe the typical change trend of the cooking container temperature under the corresponding cooking mode. The control module adjusts the second airflow parameter in advance according to the predicted trend, so that the system can correct the temperature before it deviates significantly.

[0040] The working principle and beneficial effects of the above technical solution are as follows: This embodiment can determine or correct the second airflow parameters based on the current temperature deviation, the rate of temperature change, and the temperature change trend corresponding to the preset cooking mode. The above methods can be used individually or in combination, allowing the second airflow parameters to simultaneously consider the current temperature state and the temperature change trend.

[0041] Example 5: Based on Example 1, the target airflow parameter is determined by integrating the first airflow parameter and the second airflow parameter, including: determining the larger value between the first airflow parameter and the second airflow parameter as the target airflow parameter; Determining the heating power compensation amount includes: determining the heating power compensation amount based on the difference between the target airflow parameter and the second airflow parameter and the preset power compensation coefficient; when the target airflow parameter is greater than the second airflow parameter, increasing the heating power to compensate for the increased convective heat dissipation caused by the target airflow parameter exceeding the second airflow parameter; when the target airflow parameter is equal to the second airflow parameter, no additional heating power compensation is generated due to airflow deviation.

[0042] In this embodiment, the physical meaning of the fusion strategy that takes the larger value is that at any given time, the actual operating airflow of the airflow generator must not be lower than the higher of the requirements for smoke extraction (first airflow parameter) and temperature control (second airflow parameter), to ensure that the more stringent constraint of the two control objectives is met. When the smoke extraction demand is dominant (first airflow parameter is larger), the system prioritizes the smoke extraction effect. At this time, the portion of the target airflow parameter that exceeds the temperature control requirement will cause additional heat dissipation, which needs to be compensated by the heating power compensation. When the temperature control demand is dominant (second airflow parameter is larger), the target airflow parameter is equal to the second airflow parameter, the difference between the two is zero, the heating power compensation is zero, and the system is in a pure temperature control dominant state.

[0043] In this embodiment, the power compensation coefficient is used to convert the airflow deviation into a preliminary power compensation amount, which is pre-stored in the system to provide a basic calculation benchmark for the heating power compensation amount. In the further calculation process described in Embodiments 6 to 8, the compensation amount can be corrected according to the convective heat dissipation caused by the airflow deviation and the response delay of the heating device. A relatively simplified implementation method is provided here.

[0044] The working principle and beneficial effects of the above technical solution are as follows: In this embodiment, the larger value between the first airflow parameter and the second airflow parameter is used as the target airflow parameter. When the first airflow parameter corresponding to the smoke exhaust demand is larger, the target airflow parameter is higher than the second airflow parameter required for temperature control, and the increased convective heat dissipation is compensated by the heating power compensation amount; when the second airflow parameter is not less than the first airflow parameter, the target airflow parameter is equal to the second airflow parameter, and there is no airflow deviation between the two, so there is no need to increase the heating power due to this deviation.

[0045] Example 6: Based on Example 5, the heating power compensation amount of the heating device in the stove assembly is determined according to the deviation of the target airflow parameter from the second airflow parameter, such as... Figure 2 As shown, it includes: Step a: Extract the target airflow parameter and the second airflow parameter, calculate the difference between them, and obtain the airflow deviation; the airflow deviation is used to characterize the degree to which the target airflow parameter is higher than the second airflow parameter in order to meet the smoke exhaust requirements; Step b: Obtain temperature information and the system's pre-stored ambient reference temperature, and determine the real-time convective heat transfer gradient on the surface of the cooking container based on the difference between the two. Step c: Based on the correspondence between the pre-stored airflow parameters and the convective heat transfer coefficient, convert the airflow deviation into the change in the convective heat transfer coefficient, and combine it with the real-time convective heat transfer gradient and the effective heat exchange area of ​​the cooking container to determine the equivalent of the actual convective heat loss. Step d: Obtain the power regulation response delay parameter of the heating device, estimate the heat deficit formed by the equivalent of actual convective heat loss during the response period of the heating device based on the response delay parameter, and determine the heating power compensation amount based on the heat deficit.

[0046] In this embodiment, the airflow deviation is the difference between the target airflow parameter and the second airflow parameter. Since the target airflow parameter is the larger of the first and second airflow parameters, the airflow deviation is not less than zero. When the airflow deviation is zero, it means that the temperature control requirement is not lower than the smoke exhaust requirement. When the airflow deviation is greater than zero, it means that the smoke exhaust requirement makes the actual airflow higher than the airflow required for temperature control.

[0047] In this embodiment, the real-time convective heat transfer gradient is determined by the difference between the current temperature information and the system's pre-stored environmental reference temperature, reflecting the temperature difference between the surface of the cooking container and the surrounding environment. Under otherwise identical conditions, the greater the temperature difference, the more significant the change in convective heat dissipation caused by the same airflow change. Therefore, when determining the equivalent of actual convective heat loss, both the airflow deviation and the real-time convective heat transfer gradient are considered.

[0048] In this embodiment, the correspondence between the airflow parameters and the convective heat transfer coefficient is specifically represented by a dynamic convective heat transfer coefficient incremental model fitted based on the Nusselt number correlation of fluid dynamics during the factory development stage after wind tunnel experiments or calibration tests; the form of the Nusselt number correlation is as follows: ,in: The convective heat transfer coefficient; The Reynolds number characterizes the fluid flow state. Prandtl number, which characterizes the thermal properties of fluids; , , All of these are empirical fitting coefficients obtained based on wind tunnel experimental data.

[0049] In this embodiment, advance compensation based on response delay refers to: after an airflow change occurs, estimating the heat deficit during the time required for the heating device to actually establish the corresponding thermal power from receiving the power adjustment command, and determining the amount of heating power compensation accordingly. See Embodiment 8 for the specific processing procedure.

[0050] In this embodiment, the power regulation response delay parameter is a characteristic parameter describing the time delay between the heating device receiving a power adjustment command and the actual change in the output heat power. It is pre-stored in the system and is related to the physical type of the heating device (electromagnetic heating, electric heating tube, etc.) and its current operating state. This parameter provides a time scale reference for subsequent phase lead compensation.

[0051] The working principle and beneficial effects of the above technical solution are as follows: This embodiment first estimates the additional heat dissipation caused by the airflow deviation based on the airflow deviation, real-time convective heat transfer gradient, and effective heat exchange area. Then, it estimates the heat deficit during the response period by combining the response delay of the heating device, and thus determines the heating power compensation amount. Therefore, the compensation amount simultaneously considers airflow changes, the current temperature state, and the response time of the heating device, which can reduce the error caused by directly adjusting the power based solely on the airflow deviation.

[0052] Example 7: Based on Example 6, determine the actual convective heat loss equivalent, including: Based on the airflow deviation, the change in convective heat transfer coefficient corresponding to the current airflow deviation is determined from the pre-stored correspondence between airflow parameters and convective heat transfer coefficients in the system. The additional convective heat dissipation power per unit area is determined by combining the real-time convective heat transfer gradient with the change in the convective heat transfer coefficient. The total theoretical heat loss is determined based on the additional convective heat dissipation power per unit area and the effective heat exchange area matching the current cooking container. Based on the current thermal inertia of the food being cooked, the total theoretical heat loss is smoothed to reduce the impact of short-term airflow fluctuations on the calculation results, thus obtaining the actual convective heat loss equivalent.

[0053] In this embodiment, the system pre-stores the correspondence between airflow parameters and convective heat transfer coefficients. This correspondence can be established during the product development phase through testing at different airflow levels and stored in the form of a data table or a parameterized correspondence. During system operation, the corresponding change in convective heat transfer coefficient is determined based on the airflow deviation.

[0054] In this embodiment, the additional convective heat dissipation power per unit area is determined by the real-time convective heat transfer gradient and the change in the convective heat transfer coefficient, and is used to represent the increased heat dissipation power per unit area due to the deviation of the airflow.

[0055] In this embodiment, the effective heat exchange area parameter is a pre-stored parameter in the system representing the surface area of ​​the container participating in convective heat exchange, which is matched to a specific cooking container. Cooking containers of different shapes and sizes have different areas participating in convective heat exchange, and the system can identify the container model or match the corresponding effective heat exchange area through user configuration.

[0056] In this embodiment, the thermal inertia state of the food being cooked is used to reflect the degree to which the food in the pot buffers temperature changes. The system can determine the current load state based on the cooking mode or the rate of temperature rise, and select the appropriate smoothing intensity to reduce frequent changes in calculation results caused by short-term airflow fluctuations.

[0057] Specifically, the thermal inertia state is determined by the phase state of the cooked food (such as aqueous phase, oil phase, or solid phase) and the mass of the ingredients. and specific heat capacity The quantization mapping relationship is determined; the smoothing process specifically involves inputting the total theoretical heat loss value into a digital filtering module, which possesses a first-order low-pass filter transfer function. ,in: Let be the transfer function in the Laplace domain. For the Laplace operator, The thermal time constant. ,in: For the quality of ingredients; The specific heat capacity of the food being cooked; This represents the current convective heat transfer coefficient; This represents the effective heat exchange area of ​​the cooking container. By anchoring the smoothed time constant to the actual physical heat capacity parameters of the cooking system, high-frequency heat dissipation noise caused by transient airflow turbulence is automatically filtered out, resulting in a stable and physically interpretable output of the actual convective heat loss equivalent.

[0058] The working principle and beneficial effects of the above technical solution are as follows: This embodiment processes the airflow deviation, the change in convective heat transfer coefficient, the additional convective heat dissipation power per unit area, the total theoretical heat loss, and the equivalent of the actual convective heat dissipation loss after smoothing in that order. Each step corresponds to the conversion of physical quantities from airflow change to heat dissipation power change, thus avoiding the direct use of airflow parameters as heat dissipation power.

[0059] Example 8: Based on Example 6, the heating power compensation amount is determined according to the power adjustment response delay parameter of the heating device, including: The power regulation response delay parameter corresponding to the current working state is obtained from the pre-stored heating device response characteristic parameter library of the system, and the number of control cycles covered by the response delay is determined according to the power regulation response delay parameter and the current working sampling period of the system; wherein, the power regulation response delay parameter is obtained by the step response calibration method, that is, during the factory test, a preset amplitude power step command is applied to the heating device, and the time required from the issuance of the command to the temperature rise rate reaching the steady-state set ratio is recorded as the parameter; Estimate the heat deficit generated by the heating device during the response delay based on the actual convective heat loss equivalent. Based on the electrothermal conversion efficiency of the heating device under its current operating state, the heat deficit is converted into the required increase in heating power; specifically, the heating power is compensated for in phase advance using the power regulation response delay parameter, and the calculation adopts a discrete domain feedforward compensation structure. .in: This is the current sampling time; Calculate the additional heating power required at the current moment; This represents the power deficit calculated from the heat deficit at the current moment. This represents the power gap from the previous sampling time. This is the preset gain coefficient; This represents the current sampling period of the system. The advance time constant is determined proportionally based on the measured power regulation response delay parameter. This physical execution structure injects an advance power command at the moment the airflow deviation occurs, eliminating temperature drops within the physical response blind zone of the heating device.

[0060] By combining the current basic heating power and the upper limit of the rated power of the heating device, the required increase in heating power is limited, and the amount of heating power compensation is obtained.

[0061] In this embodiment, the heating device response characteristic parameter library is a set of parameters pre-stored in the system that describe the dynamic response characteristics of a specific heating device from receiving a power adjustment command to the corresponding change in actual output heat power. Different types of heating devices (such as electromagnetic induction heating coils, electric heating tubes, etc.) are constrained by their physical working mechanisms, resulting in different response delay times; even the same type of heating device has different response speeds in different power ranges. The power adjustment response delay parameter is a quantified value extracted from this parameter library that reflects the time required for the heating device to actually establish power in its current operating state from the issuance of the command.

[0062] In this embodiment, the number of control cycles covered by the response delay is determined based on the power regulation response delay parameter and the current operating sampling period of the system, and is used to represent the number of control cycles experienced between the issuance of the control command and the actual establishment of the heating power.

[0063] In this embodiment, this step uses the actual convective heat loss equivalent as a reference for heat dissipation power, and estimates the heat deficit that is continuously generated during the response delay period based on the power adjustment response delay parameter of the heating device.

[0064] In this embodiment, the electrothermal conversion efficiency is used to represent the efficiency relationship between the input electrical power of the heating device and the effective heat transferred to the cooking container. Based on this efficiency, the heat deficit during the response delay period is converted into the heating power that needs to be increased.

[0065] In this embodiment, the basic heating operating state represents the current power output level of the heating device. The system combines the basic heating power and the rated power limit to limit the required increase in heating power, ensuring that the total heating power after compensation does not exceed the rated power limit.

[0066] The working principle and beneficial effects of the above technical solution are as follows: Based on the existing response delay of the heating device, this embodiment estimates the heat deficit during the response delay period when the airflow changes, and determines the corresponding heating power compensation amount in advance; at the same time, it limits the compensation amount in combination with the basic heating power and the upper limit of the rated power to avoid the total power after compensation from exceeding the rated range.

[0067] Example 9: Based on Example 1, controlling the airflow generator in the smoke exhaust module to operate according to the target airflow parameters includes: The airflow generating device is controlled to rotate forward or reverse according to control commands; And / or, The angle of the guide component on the air outlet side of the airflow generator in the exhaust module is controlled so that the airflow generated by the airflow generator switches between a first state of blowing towards the cooking container and a second state of being discharged towards the exhaust duct.

[0068] In this embodiment, the guide component is an adjustable-angle mechanism, such as a guide vane or guide plate, located on the air outlet side of the airflow generator. In conjunction with the airflow generated by the forward or reverse rotation of the airflow generator, the direction of the airflow can be controlled by changing its angle. The angle adjustment of the guide component is uniformly driven by the control module, eliminating the need to stop and restart the airflow generator when only changing the baffle to reverse the airflow direction, thus achieving low-latency continuous switching of the flow direction.

[0069] In this embodiment, the first state refers to the airflow generated by the airflow generator being guided by the guide component to directly blow onto the cooking container. This state primarily serves the temperature control needs of assisting in cooling the cooking container or promoting heat circulation through forced convection. The second state refers to the airflow being guided by the guide component to the exhaust duct. This state primarily serves the exhaust needs of carrying fumes to the exhaust path. Distributing the airflow simultaneously to both states according to a preset ratio means adjusting the guide component to a neutral angle so that the airflow simultaneously covers both directions. This is suitable for cooking stages where temperature control and exhaust needs are equally important and neither can be neglected.

[0070] The working principle and beneficial effects of the above technical solution are as follows: This embodiment controls the angle of the airflow guide component, enabling the output airflow of the same airflow generator to switch or proportionally distribute between the exhaust direction and the direction towards the cooking container. Compared to setting two separate airflow devices, this method reduces structural complexity; when both exhaust and temperature control are required simultaneously, the airflow in both directions can be distributed by adjusting the position of the airflow guide component.

[0071] Example 10: Based on Example 1, the following operations are also performed: The human-computer interaction interface is used to acquire and record the user's manual correction operations on the target airflow parameters or heating power compensation amount; Based on the adjustment direction and frequency of the manual correction operation, update the first airflow mapping relationship on which the first airflow parameter is determined, and / or update the airflow adjustment coefficient on which the second airflow parameter is determined, for use in determining the subsequent target airflow parameter and heating power compensation amount.

[0072] In this embodiment, manual correction is the act of a user intervening and adjusting the target airflow parameters or heating power compensation amount automatically determined by the system through the human-computer interaction interface such as the control panel, touch screen or associated mobile application of the smart cooker. For example, if the airflow is too strong, the user can manually turn down the setting, or if the pot temperature is still insufficient after compensation, the user can manually increase the heating power.

[0073] In this embodiment, the adjustment direction refers to the direction of increase or decrease of the manually corrected value relative to the automatically calculated value by the system, and the adjustment frequency refers to the number of times the user repeatedly performs the same-direction correction under the same type of operating conditions within a certain period of time. The parameter update triggering rule is as follows: when the system detects that the frequency of the user's same-direction adjustment under similar cooking conditions (including similar temperature ranges and similar cooking modes) exceeds a preset threshold (e.g., three consecutive same-direction corrections within the same temperature range), it determines that there is a systematic deviation in the current parameter and triggers a parameter update. The update method is as follows: using the average value of each manual correction by the user as the parameter correction step size, the airflow parameter value in the first airflow mapping relationship of the corresponding temperature range or the airflow adjustment coefficient of the corresponding deviation range is gradually adjusted in small steps according to the correction direction, rather than making a large-scale modification all at once, to ensure the stability of the parameter update. By statistically analyzing the adjustment direction and frequency to trigger the update, rather than updating immediately after each correction, it can prevent the incorrect modification of key parameters due to occasional user misoperations.

[0074] The working principle and beneficial effects of the above technical solution are as follows: This embodiment adjusts the corresponding parameters gradually based on repeated manual corrections made by the user in the same direction under similar cooking conditions. By updating the parameters only after reaching a preset adjustment frequency, the impact of a single accidental operation on the parameters can be reduced, and the subsequent automatic control results can gradually approach the user's commonly used settings.

[0075] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A smoke extraction system for a smart cooker, the smart cooker comprising a cooking container, a cooktop assembly for heating the cooking container, and a lid assembly, characterized in that, The smoke exhaust system includes a smoke exhaust module and a control module disposed on the pot lid assembly. The smoke exhaust module includes an airflow generating device and a smoke exhaust channel. The stove assembly includes a heating device. Both the airflow generating device and the heating device are electrically connected to the control module. The control module includes a temperature information acquisition module, an airflow parameter determination module, and a heating compensation parameter determination module. The temperature information acquisition module is used to acquire temperature information reflecting the temperature of the cooking container; The airflow parameter determination module is used to determine the first airflow parameter required to exhaust the fumes generated during cooking based on the temperature information; and to determine the second airflow parameter required to bring the temperature of the cooking container toward the preset target temperature based on the deviation between the temperature information and the preset target temperature. The heating compensation parameter determination module is used to integrate the first airflow parameter and the second airflow parameter to determine the target airflow parameter to be executed by the airflow generating device; and to determine the heating power compensation amount of the heating device in the stove assembly based on the deviation of the target airflow parameter from the second airflow parameter. The control module is also used to control the airflow generator to operate according to the target airflow parameters in order to exhaust oil fumes; and to control the heating device to adjust the heating power according to the heating power compensation amount, so that the airflow generator and the heating device work together to increase the temperature of the cooking container.

2. The smoke extraction system for smart cookers as described in claim 1, characterized in that, The temperature information acquisition module performs the following operations: The current operating heating power and heating duration of the heating device in the stove assembly are obtained. Based on the current operating heating power, heating duration, and the thermodynamic parameters of the cooking container pre-stored in the system, the temperature information is estimated. And / or, Temperature information is obtained by acquiring the temperature distribution of different areas of the cooking container through an array of temperature measuring units located on the lid assembly and facing the cooking container.

3. The smoke extraction system for smart cookers as described in claim 1, characterized in that, Determining the first airflow parameters includes: The temperature information is compared with multiple preset temperature ranges to determine the target temperature range in which the temperature information is located. Based on the first airflow mapping relationship between the preset temperature range and the airflow parameters required for fume exhaust, the first airflow parameters corresponding to the target temperature range are obtained.

4. The smoke extraction system for smart cookers as described in claim 1, characterized in that, Determining the second airflow parameters includes: Calculate the deviation between the temperature information and the preset target temperature, and determine the second airflow parameter based on the deviation and the preset airflow adjustment coefficient; And / or, Based on the temperature information obtained at the current moment and the temperature information obtained at historical moments, the rate of change of the temperature information is calculated; before the temperature information reaches the preset target temperature, the second airflow parameter is adjusted in advance according to the direction and magnitude of the rate of change, so that the direction of airflow adjustment is opposite to the trend of the temperature continuing to deviate from the preset target temperature. And / or, The system obtains the user-defined cooking mode or preset temperature setting, predicts the temperature change trend based on the preset temperature change trend model corresponding to the cooking mode or preset temperature setting, and adjusts the second airflow parameter in advance according to the predicted change direction and degree, so that the airflow adjustment direction is opposite to the predicted temperature deviation trend.

5. The smoke extraction system for smart cookers as described in claim 1, characterized in that, Determining the target airflow parameter by integrating the first airflow parameter and the second airflow parameter includes: determining the larger value between the first airflow parameter and the second airflow parameter as the target airflow parameter; Determining the heating power compensation amount includes: determining the heating power compensation amount based on the difference between the target airflow parameter and the second airflow parameter and the preset power compensation coefficient; when the target airflow parameter is greater than the second airflow parameter, increasing the heating power to compensate for the increased convective heat dissipation caused by the target airflow parameter exceeding the second airflow parameter; when the target airflow parameter is equal to the second airflow parameter, no additional heating power compensation is generated due to airflow deviation.

6. The smoke extraction system for smart cookers as described in claim 5, characterized in that, Based on the deviation of the target airflow parameter from the second airflow parameter, the heating power compensation amount of the heating device in the cooktop assembly is determined, including: Extract the target airflow parameters and the second airflow parameters, calculate the difference between them, and obtain the airflow deviation; the airflow deviation is used to characterize the degree to which the target airflow parameters are higher than the second airflow parameters in order to meet the smoke exhaust requirements; Acquire temperature information and a preset ambient reference temperature, and determine the real-time convective heat transfer gradient on the surface of the cooking container based on the difference between the two. Based on the correspondence between the pre-stored airflow parameters and the convective heat transfer coefficient, the airflow deviation is converted into the change in the convective heat transfer coefficient. Combined with the real-time convective heat transfer gradient and the effective heat exchange area of ​​the cooking container, the actual convective heat loss equivalent is determined. Obtain the power regulation response delay parameter of the heating device, estimate the heat deficit formed by the equivalent of actual convective heat loss during the response period of the heating device based on the response delay parameter, and determine the heating power compensation amount based on the heat deficit.

7. The smoke extraction system for smart cookers as described in claim 6, characterized in that, Determine the equivalent of actual convective heat loss, including: Based on the airflow deviation, the change in convective heat transfer coefficient corresponding to the current airflow deviation is determined from the pre-stored correspondence between airflow parameters and convective heat transfer coefficients in the system. The additional convective heat dissipation power per unit area is determined by combining the real-time convective heat transfer gradient with the change in the convective heat transfer coefficient. The total theoretical heat loss is determined based on the additional convective heat dissipation power per unit area and the effective heat exchange area matching the current cooking container. Based on the current thermal inertia of the food being cooked, the total theoretical heat loss is smoothed to reduce the impact of short-term airflow fluctuations on the calculation results, thus obtaining the actual convective heat loss equivalent.

8. The smoke extraction system for smart cookers as described in claim 6, characterized in that, Determining the heating power compensation amount based on the power regulation response delay parameter includes: The power regulation response delay parameter corresponding to the current working state is obtained from the pre-stored heating device response characteristic parameter library of the system, and the number of control cycles covered by the response delay is determined according to the power regulation response delay parameter and the current working sampling period of the system. Estimate the heat deficit generated by the heating device during the response delay based on the actual convective heat loss equivalent. Based on the electrothermal conversion efficiency of the heating device under its current operating state, the heat deficit is converted into the required increase in heating power. By combining the current basic heating power and the upper limit of the rated power of the heating device, the required increase in heating power is limited, and the amount of heating power compensation is obtained.

9. The smoke extraction system for smart cookers as described in claim 1, characterized in that, Controlling the airflow generator of the smoke exhaust module to operate according to the target airflow parameters includes: The airflow generating device is controlled to rotate forward or reverse according to control commands; And / or, The angle of the guide component on the air outlet side of the airflow generator of the exhaust module is controlled so that the airflow generated by the airflow generator switches between a first state of blowing towards the cooking container and a second state of being discharged towards the exhaust duct.

10. The smoke extraction system for smart cookers as described in claim 1, characterized in that, Also perform the following operations: The human-computer interaction interface is used to acquire and record the user's manual correction operations on the target airflow parameters or heating power compensation amount; The parameters are updated based on the adjustment direction and frequency of the manual correction operation; wherein, the adjustment frequency is the number of manual corrections in the same direction counted in similar temperature ranges and the same cooking mode. When the adjustment frequency reaches a preset threshold, the first airflow mapping relationship and / or airflow adjustment coefficient are updated based on the corresponding manual correction amount for the determination of subsequent target airflow parameters and heating power compensation amount.

Images