A pressure relief control method and system for an electric rice cooker based on fusion boiling point detection

Abstract

The embodiment of the present application discloses a kind of based on fusion boiling point detection's electric rice cooker pressure relief control method and system, the method of the present application includes: obtaining boiling point estimate value;Calculate the boiling point deviation between boiling point estimate value and top temperature in pot, and judge whether to satisfy preset condition;If it satisfies preset condition, then determine pressure relief adjustment target according to the boiling point deviation, and discharge steam by pressure relief valve with spiral exhaust passage and pressure relief;Make the valve opening of pressure relief valve continuously change in preset range;The change rate of the valve opening is constrained.The pressure relief process of the present application is smooth, continuous, controllable, and the impact and oscillation of pressure relief control process can be avoided.

Description

Technical Field

[0001] This invention relates to the field of rice cooker technology, specifically to a rice cooker pressure relief control method and system, electronic device, and storage medium based on fusion boiling point detection. Background Technology

[0002] Existing rice cooker pressure relief control typically relies on a single pressure threshold or simple temperature judgment to trigger the pressure relief valve. In actual heating and boiling processes, this is easily affected by instantaneous pressure fluctuations, sensor lag, and changes in operating conditions, resulting in inaccurate pressure relief timing. At the same time, existing pressure relief valves mostly use on / off or coarse adjustment methods, resulting in drastic changes in valve opening and discontinuous steam pressure release, which can easily generate shocks, vibrations, and noise, affecting cooking safety and stability.

[0003] Therefore, there is an urgent need for a pressure relief control method that can accurately determine the pressure relief demand during the boiling critical stage and achieve a stable release of steam pressure. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a rice cooker pressure relief control method, system and electronic device based on fusion boiling point detection, which realizes a controllable, continuous and low-impact pressure relief process through spiral exhaust channel and valve dynamic constraint.

[0005] To address the aforementioned problems, the first aspect of this invention discloses a method for controlling pressure relief in a rice cooker based on fusion boiling point detection, comprising the following steps:

[0006] Obtain the top temperature and steam pressure inside the pot, and based on the top temperature and steam pressure inside the pot, obtain the boiling point estimate.

[0007] Calculate the boiling point deviation between the estimated boiling point and the temperature at the top of the pot, and determine whether a preset condition is met; the preset condition includes at least that the boiling point deviation is greater than or equal to the pressure relief trigger threshold.

[0008] If the preset conditions are met, the pressure relief adjustment target is determined according to the boiling point deviation, and the steam is discharged and pressure is relieved through the pressure relief valve with the spiral exhaust channel; wherein, the spiral exhaust channel has different effective flow length and equivalent flow cross-sectional area at different valve openings, and the steam pressure forms a controllable pressure gradient in the spiral exhaust channel and is released segment by segment in the spiral exhaust channel;

[0009] During the pressure relief process, the valve opening of the pressure relief valve is continuously and dynamically adjusted based on the pressure relief adjustment target, so that the valve opening of the pressure relief valve changes continuously within a preset range.

[0010] The rate of change of the valve opening is constrained based on the effective flow length and equivalent flow cross-sectional area of ​​the spiral exhaust channel corresponding to the current valve opening.

[0011] Optionally, constraining the rate of change of the valve opening includes:

[0012] Determine the effective flow length and equivalent flow cross-sectional area of ​​the corresponding spiral exhaust channel based on the current valve opening.

[0013] The pressure relief valve's pressure release capability is assessed based on the effective flow length and equivalent flow cross-sectional area.

[0014] The maximum allowable opening change rate is determined based on the pressure relief capability, and the valve opening adjustment process is dynamically constrained based on the maximum allowable opening change rate.

[0015] Optionally, determining the maximum permissible rate of change of opening based on the pressure relief capability includes:

[0016] The allowable pressure change rate is determined based on the pressure release capability; the pressure change rate is then mapped to an allowable opening change rate mapping value.

[0017] Based on the boiling point deviation, determine the risk level of the current working state;

[0018] The maximum permissible rate of change of opening is determined based on the risk level and the permissible rate of change of opening mapping value.

[0019] Optionally, the valve opening of the pressure relief valve is continuously and dynamically adjusted based on the pressure relief adjustment target, and the adjusted valve opening satisfies the following formula:

[0020] ;in, This represents the valve opening at the current moment. The adjusted valve opening. The target valve opening is defined as the pressure relief regulation target, which is determined by a preset mapping function based on the boiling point deviation; clip is a limiting function.

[0021] Optionally, the preset condition is that the boiling point deviation continues to exceed the pressure relief trigger threshold for a preset duration, and the rate of change of steam pressure inside the pot exceeds a preset pressure change rate threshold.

[0022] Optionally, when it is determined that the preset conditions are not met, the pressure relief state is obtained, and the current heating power is adjusted according to the boiling point deviation and the pressure relief state; the pressure relief state includes the valve opening state of the pressure relief valve and / or the pressure relief continuous state and / or the steam discharge state.

[0023] Optionally, obtaining the top temperature and steam gauge pressure inside the pot, and obtaining a boiling point estimate based on the top temperature and steam gauge pressure inside the pot, includes:

[0024] Based on the steam gauge pressure inside the boiler, a pressure-corrected boiling point is obtained through a boiling point calculation model. The temperature at the top of the boiler is compared with the pressure-corrected boiling point to assess the consistency of the current thermal state. Based on the consistency assessment results, the output of the boiling point calculation model is corrected to obtain the final boiling point estimate.

[0025] A second aspect of this invention discloses a pressure relief control system for a rice cooker based on fusion boiling point detection, comprising:

[0026] The estimation unit is used to obtain the top temperature inside the pot and the steam pressure inside the pot, and to obtain the boiling point estimate based on the top temperature inside the pot and the steam pressure inside the pot.

[0027] The determination unit is used to calculate the boiling point deviation between the estimated boiling point and the temperature at the top of the pot, and to determine whether a preset condition is met; the preset condition includes at least the boiling point deviation being greater than or equal to the pressure relief trigger threshold.

[0028] The pressure relief unit is used to determine the pressure relief adjustment target based on the boiling point deviation if the preset conditions are met, and to release the steam pressure through the pressure relief valve with a spiral exhaust channel; wherein, the spiral exhaust channel has different effective flow lengths and equivalent flow cross-sectional areas at different valve openings, and the steam pressure forms a controllable pressure gradient in the spiral exhaust channel and is released segment by segment in the spiral exhaust channel;

[0029] The regulating unit is used to continuously and dynamically adjust the valve opening of the pressure relief valve based on the pressure relief regulating target during the pressure relief process, so that the valve opening of the pressure relief valve changes continuously within a preset range.

[0030] The constraint unit is used to constrain the rate of change of the valve opening based on the effective flow length and equivalent flow cross-sectional area of ​​the spiral exhaust channel corresponding to the current valve opening.

[0031] A third aspect of the present invention discloses an electronic device, comprising: a memory storing executable program code; a processor coupled to the memory; the processor calling the executable program code stored in the memory to execute the rice cooker pressure relief control method based on fusion boiling point detection disclosed in the first aspect of the present invention.

[0032] A fourth aspect of the present invention discloses a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute the electric rice cooker pressure relief control method based on fusion boiling point detection disclosed in the first aspect of the present invention.

[0033] Compared with the prior art, the beneficial effects of the embodiments of the present invention are as follows:

[0034] 1. Improve the reliability of pressure relief trigger judgment.

[0035] This invention estimates the boiling point by combining the temperature at the top of the pot with the steam gauge pressure inside the pot, and determines whether to trigger pressure relief based on the boiling point deviation. This effectively avoids false triggering caused by relying on a single pressure or temperature signal, and improves the stability and accuracy of pressure relief timing judgment.

[0036] 2. Achieve stable and controllable release of steam pressure.

[0037] This invention utilizes a pressure relief valve with a spiral exhaust channel to create a controllable pressure gradient along the channel for steam at different valve openings. Combined with continuous dynamic adjustment of the valve opening, it avoids sudden pressure drops, thereby reducing shock, oscillation, and noise.

[0038] 3. Reduce system impact and improve overall operational stability

[0039] This invention constrains the rate of change of valve opening based on the effective flow length and equivalent flow cross-sectional area of ​​the spiral exhaust channel, so that the pressure relief process changes continuously in the time dimension and is released segment by segment in the spatial dimension, which helps to improve the overall safety and reliability of the rice cooker during the boiling and pressure relief stages.

[0040] 4. Power regulation and pressure relief coordination

[0041] When the boiling point deviation does not reach the pressure relief threshold, the boiling trend is suppressed by power adjustment, and the power is adjusted in combination with the pressure relief status to avoid premature pressure relief and power waste. By mapping the thermal state level with the pressure release state, the heating power is controlled in stages to improve cooking efficiency and safety. Attached Figure Description

[0042] Figure 1 This is a schematic flowchart of a rice cooker pressure relief control method based on fusion boiling point detection provided in an embodiment of the present invention;

[0043] Figure 2 This is a schematic diagram of the structure of a rice cooker pressure relief control system based on fusion boiling point detection, provided in an embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of the present invention. Detailed Implementation

[0045] This specific embodiment is merely an explanation of the embodiments of the present invention and is not intended to limit the embodiments of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the embodiments of the present invention, they are protected by patent law.

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the 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 are within the protection scope of the embodiments of the present invention.

[0047] The term "comprising" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.

[0048] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0049] Example 1

[0050] Please refer to Figures 1-3 As shown, a pressure relief control method for a rice cooker based on fusion boiling point detection is described, such as... Figure 1 As shown, it includes the following steps:

[0051] Step S110: Obtain the top temperature inside the pot and the steam pressure inside the pot, and obtain the boiling point estimate based on the top temperature inside the pot and the steam pressure inside the pot.

[0052] As a specific embodiment, the boiling point estimate can be directly calculated from the absolute pressure of the steam inside the boiler by measuring the steam gauge pressure inside the boiler, and then the boiling point estimate can be derived based on the absolute pressure.

[0053] In another embodiment, step S110 includes:

[0054] Step S1101: Based on the steam gauge pressure value inside the boiler, obtain the pressure-corrected boiling point through the boiling point calculation model;

[0055] The boiling point calculation model determines the theoretical reference boiling point through ambient atmospheric pressure, and then performs pressure correction on the theoretical reference boiling point based on the steam gauge pressure value inside the boiler to obtain the pressure-corrected boiling point.

[0056] In this step, the gauge pressure of the steam inside the boiler is obtained, and the absolute pressure of the steam inside the boiler is determined based on the gauge pressure and the ambient atmospheric pressure. The pressure-corrected boiling point under the current operating conditions is obtained based on the absolute pressure.

[0057] Specifically, a pressure sensor installed inside the boiler is used to collect the pressure difference between the steam inside the boiler and the ambient atmospheric pressure. The pressure difference is the gauge pressure value of the steam inside the boiler.

[0058] Specifically, the boiling point can be found by referring to the table of saturated vapor pressure and temperature relationships of water. For example, with an absolute pressure of 0.20 MPa, the pressure-corrected boiling point is 120.2℃.

[0059] Step S1102: Compare the temperature at the top of the pot with the pressure-corrected boiling point to assess the consistency of the current thermal state, and correct the output of the boiling point calculation model based on the consistency assessment result to obtain the final boiling point estimate.

[0060] In this step, by introducing a consistency evaluation mechanism between temperature and pressure in deriving boiling points, and only correcting the output of the boiling point estimation model when the consistency is insufficient, the system can distinguish between "physical state not yet stable" and "true boiling state", thereby improving the reliability of boiling point estimation under dynamic operating conditions.

[0061] Specifically, the temperature at the top of the pot is obtained, and the estimated deviation between the temperature at the top of the pot and the pressure-corrected boiling point is calculated;

[0062] The estimated deviation is compared with a preset consistency judgment threshold to assess the consistency of the internal thermal state of the boiler under the current operating conditions.

[0063] When the estimation deviation exceeds the consistency judgment threshold, the output of the boiling point calculation model is corrected or its weights are adjusted to obtain a boiling point estimate for subsequent control. Specifically, a correction coefficient can be applied to the pressure-corrected boiling point, or the weights of the consistency assessment results with temperature in the boiling point calculation model can be adjusted. Only minor corrections are made when consistency is insufficient to avoid directly using pressure-derived results as the control basis before the thermal state is stable, thus preventing misjudgments due to single sensor malfunctions or operating condition lags.

[0064] For example, if the pressure-corrected boiling point is 133.5°C, and the estimated deviation of 2.7°C between the temperature at the top of the pot and the pressure-corrected boiling point exceeds the consistency threshold of 2°C, then the corrected boiling point estimate is 133.5°C. 0.2×(2.7 2) = 133.36℃.

[0065] It should be noted that this step is not directly used as a pressure relief trigger condition, but rather as a self-verification mechanism for the boiling point calculation model. This avoids misjudgments caused by a single sensor malfunction or a lag in operating conditions. It can effectively suppress false triggering or delayed triggering during the critical stage of pressure relief, and improve the stability of boiling point estimation under dynamic operating conditions. This is because, during the critical stage of pressure relief triggering, if the boiling point is estimated solely based on the pressure signal, the estimated boiling point value may deviate due to factors such as instantaneous pressure fluctuations and pressure disturbances at the initial opening of the pressure relief valve. If the judgment is made directly based on the temperature signal, it is easy to make a misjudgment because the temperature has not yet reached a stable boiling state.

[0066] Step S120: Calculate the boiling point deviation between the estimated boiling point and the temperature at the top of the pot, and determine whether a preset condition is met; the preset condition includes at least the boiling point deviation being greater than or equal to the pressure relief trigger threshold.

[0067] In this embodiment, during the pressure relief control phase, the boiling point deviation between the estimated boiling point and the temperature at the top of the pot is calculated. The temperature difference between the temperature at the top of the pot and the estimated boiling point is used to reflect the degree of deviation of the current operating condition from the boiling point.

[0068] For example, if the temperature at the top of the pot is 101℃ and the estimated boiling point is 99.5℃, then the boiling point deviation ΔT = 1.5℃.

[0069] For example, the pressure relief trigger threshold is 1℃, the boiling point deviation ΔT is 1.5℃, and the preset conditions are met.

[0070] In this embodiment, the preset conditions include at least the determination that the boiling point deviation is greater than or equal to the pressure relief trigger threshold. The pressure relief trigger threshold is used to characterize whether the current state inside the pot needs to be adjusted by the pressure relief valve, rather than simply for adjusting the heating power.

[0071] The preset conditions are only determined during the critical boiling stage, steady-state boiling stage, or pressure reduction and anti-overflow stage, and will not trigger pressure relief control during the heating and temperature rise stage.

[0072] As one embodiment, the method of the present invention further includes:

[0073] Step S1200: When it is determined that the preset conditions are not met, the pressure relief state is obtained, and the current heating power is adjusted according to the boiling point deviation and the pressure relief state; the pressure relief state includes the valve opening state of the pressure relief valve and / or the pressure relief continuous state and / or the steam discharge state.

[0074] Specifically, adjusting the current heating power based on the boiling point deviation and the pressure relief state in step S1200 may include:

[0075] Step S12001: Compare the boiling point deviation with at least one power adjustment threshold to determine the current thermal state level; wherein the thermal state level includes at least a low deviation state, a medium deviation state, and a high deviation state.

[0076] For example, the power adjustment thresholds include 0.5℃ and 1.5℃. The boiling point deviation can be compared with at least one power adjustment threshold as follows: Low deviation state: boiling point deviation ΔT < 0.5℃; Medium deviation state: 0.5℃ ≤ boiling point deviation ΔT < 1.5℃; High deviation state: boiling point deviation ΔT ≥ 1.5℃. For example, if the current boiling point deviation ΔT = 0.8℃, the current thermal state level is determined to be a medium deviation state.

[0077] Step S12002: Obtain the current pressure relief status, which includes at least one or a combination of the following: the current valve opening of the pressure relief valve; whether the pressure relief valve is in the open state and the duration of the open state; whether there is steam discharge; and determine whether the current pressure release state is an unrelieved state, a weak pressure relief state, or a continuous pressure relief state based on the pressure relief status.

[0078] For example, the current pressure relief status is as follows: Current valve opening: 0 (fully closed), no steam discharge is detected, and it is determined to be a non-pressure relief status.

[0079] Step S12003: Determine the heating power adjustment mode based on the thermal state level and the pressure release state; wherein: when in a low deviation state and without pressure relief, maintain the current heating power or make fine adjustments; when in a medium deviation state and without pressure relief, enter the active suppression heating mode; when in a medium deviation state and with weak pressure relief, enter the power coordinated adjustment mode; when in a high deviation state but without meeting the pressure relief trigger condition, enter the rapid power reduction suppression mode.

[0080] For example, when in a state of medium deviation and no pressure relief, the heating power adjustment mode is determined to be the active suppression heating mode.

[0081] Step S12004: Adjust the current heating power according to the determined heating power adjustment mode so that the heating power changes continuously within the preset range.

[0082] For example, when in a state of medium deviation and without pressure relief, it enters the active suppression heating mode, and the power is reduced by 15%–25%.

[0083] Medium deviation + weak pressure relief, enter power coordinated adjustment mode, reduce power adjustment range, avoid double suppression, set: power reduction ratio is 8%, for example: current heating power: 900 W, adjusted power P = 900 × (1 0.08) = 828W.

[0084] For example, the obtained pressure relief status is as follows: valve opening α = 0.16, pressure relief duration 2 s, steam flow rate 0.01 kg / s.

[0085] In this embodiment, when the boiling point deviation does not reach the pressure relief trigger condition, the boiling trend can be suppressed by adjusting the heating power. Before the pressure relief trigger, the pressure relief state is introduced to participate in the power adjustment, so as to achieve graded coordination between heating control and pressure relief control, and avoid premature pressure relief, which would increase noise and energy consumption and affect the cooking effect.

[0086] In another specific embodiment, the preset condition is that the boiling point deviation continues to exceed the pressure relief trigger threshold for a preset duration, and the rate of change of steam pressure inside the pot exceeds the preset pressure change rate threshold.

[0087] For example, the pressure relief trigger threshold is 1.5℃, the preset duration is 3s, and the pressure change rate threshold is 0.05 MPa / s.

[0088] When a boiling point deviation ΔT ≥ 1.5℃ is detected, but it is not maintained continuously for 3 seconds, or the maximum pressure change rate is only 0.01 MPa / s < 0.05 MPa / s, it is determined that the preset conditions are not met → pressure relief is not triggered, and only the heating power is adjusted.

[0089] In this embodiment, the preset condition is not based on a single pressure relief trigger threshold, but also includes the judgment of the time when the boiling point deviation continues to exceed the pressure relief trigger threshold and the rate of change of the steam pressure inside the pot. This is used to distinguish between transient fluctuations and the actual boiling runaway trend. By combining the persistence characteristics of temperature deviation and the dynamic characteristics of pressure change rate, multi-dimensional judgment is achieved. This can accurately determine the timing of pressure relief in the critical boiling stage, realize the judgment of the actual boiling risk, avoid false triggering caused by a single transient indicator, and ensure that pressure relief is only performed when the actual boiling risk exists, thereby avoiding false triggering caused by transient fluctuations.

[0090] Specifically, the preset conditions will only be determined during the critical boiling stage, steady-state boiling stage, or pressure reduction and anti-overflow stage, and will not trigger pressure relief control during the heating and temperature rise stage.

[0091] In this embodiment, a joint determination mechanism based on the persistence of deviation and the trend of pressure change is further introduced. The pressure relief adjustment target setting stage is only initiated when the boiling point deviation continues to exceed the pressure relief trigger threshold for a preset duration and the rate of change of steam pressure inside the boiler exceeds a preset pressure change rate threshold.

[0092] If the boiling point deviation exceeds the pressure relief trigger threshold for a preset duration, and the rate of change of steam pressure inside the boiler exceeds a preset pressure change rate threshold, then determining the pressure relief adjustment target based on the boiling point deviation includes:

[0093] Step S1300: Determine the pressure relief emergency level, which characterizes the urgency of the current steam release, based on the boiling point deviation and its changing trend;

[0094] The boiling point deviation and its trend are mapped to the pressure relief emergency level, including low emergency, medium emergency, and high emergency levels.

[0095] For example, if the boiling point deviation ΔT = 1.7 ℃ ≥ the pressure relief trigger threshold of 1.5 ℃, and the boiling point deviation change rate = 0.3 ℃ / s, the pressure relief emergency level is determined to be medium emergency level.

[0096] Step S1301: Combine the pressure relief emergency level with the cooking preference parameters set by the user to determine the corresponding risk tolerance range;

[0097] Obtain the user-defined cooking preference parameters, such as silent mode / standard mode / fast mode, and map the pressure relief emergency level to the cooking preference parameters to obtain the corresponding risk tolerance range.

[0098] For example, the mapping data is as follows: for medium emergency level, the basic risk tolerance range is ±5%, and for silent mode, the user preference adjustment coefficient is 0.8, and the corresponding risk tolerance range is ±4%.

[0099] Step S1302: Based on the risk tolerance range and in conjunction with the pressure relief valve at the current valve opening, generate the initial target valve opening.

[0100] Step S1302 specifically includes:

[0101] First, calculate the target valve opening reference value. Specifically, calculate the target valve opening reference value based on the boiling point deviation and the opening sensitivity coefficient k1.

[0102] Specifically, the target valve opening reference value = current valve opening + opening sensitivity coefficient Temperature deviation;

[0103] Example: Current valve opening =0.2, temperature deviation ΔT=1.8°C, k1=0.08 / °C, target valve opening reference. = 0.2 + 0.08 × 1.8 = 0.344.

[0104] Then, by combining the target valve opening benchmark with the risk tolerance range, the initial target valve opening is obtained. ;

[0105] in, The initial target valve opening. The current valve opening. The target valve opening reference is used. This is the risk tolerance range;

[0106] For example, the risk tolerance range is ±4%; the initial target valve opening is... =0.2+0.04=0.24.

[0107] Step S1303: Based on the current rate of change of steam pressure inside the boiler, determine the minimum safe pressure relief opening that satisfies the requirement that the rate of change of steam pressure does not exceed a preset safety threshold; compare the minimum safe pressure relief opening with the initial target valve opening, and select the larger of the two as the pressure relief adjustment target.

[0108] For example, by looking up a table or mapping, we obtain: pressure change rate ≤ 0.05 MPa / s, minimum safe pressure relief opening = 0.32, and calculate the initial target valve opening. =0.2+0.04=0.24<0.32, then the minimum safe pressure relief opening of 0.32 is taken as the pressure relief adjustment target.

[0109] In this embodiment, boiling point deviation, changing trend, and user preferences are quantified as pressure relief adjustment targets to achieve safety, controllability, and user customizability of pressure relief control.

[0110] Step S130: If the preset conditions are met, the pressure relief adjustment target is determined based on the boiling point deviation, and the steam is discharged and pressure is relieved through the pressure relief valve with a spiral exhaust channel. The spiral exhaust channel has different effective flow lengths and equivalent flow cross-sectional areas at different valve openings, and the steam pressure forms a controllable pressure gradient in the spiral exhaust channel, and is released segment by segment within the spiral exhaust channel.

[0111] In this embodiment, the pressure relief adjustment target is used to constrain the adjustment process of the pressure relief valve, ensuring that the valve opening continuously changes within a preset range, rather than switching between open and closed states. Specifically, the pressure relief adjustment target determines the adjustment direction and magnitude, while the pressure gradient limits the adjustment rhythm. For example, a temperature deviation of +1.8°C indicates a high pressure relief demand, with a target valve opening of 50%, but a high current channel pressure gradient disallows instantaneous large opening.

[0112] It should be noted that the effective flow length refers to the length of the spiral path through which steam actually flows from the valve core inlet to the exhaust outlet; the equivalent flow cross-sectional area refers to the cross-sectional area through which steam can pass under the current valve opening; and the pressure gradient refers to the rate of pressure drop of steam along the length of the spiral exhaust channel.

[0113] In practice, when the pressure relief valve of the rice cooker is slightly open, the effective flow length is long, the equivalent flow cross-sectional area is small, the gradient is high, and the pressure release speed is fast; when the pressure relief valve of the rice cooker is fully open, the effective flow length is short, the equivalent flow cross-sectional area is large, the gradient is low, and the pressure release speed is slow.

[0114] In this embodiment, the spiral exhaust channel is used to construct a spatial pressure gradient of steam along the flow direction, and the constraint of the valve opening change rate is set to limit the rate of change of steam pressure over time, so as to achieve the gradual release of pressure in space and the smooth change in time.

[0115] Step S140: During the pressure relief process, the valve opening of the pressure relief valve is continuously and dynamically adjusted based on the pressure relief adjustment target, so that the valve opening of the pressure relief valve changes continuously within a preset range;

[0116] Specifically, the adjusted valve opening satisfies the following formula:

[0117] ;

[0118] in, This represents the valve opening at the current moment. The adjusted valve opening. The target valve opening is defined as follows: the pressure relief regulation target includes, but is not limited to, the target valve opening. The target valve opening is determined based on the boiling point deviation using a preset mapping function, such that the larger the boiling point deviation, the larger the corresponding target valve opening. `clip` is a limiting function. This refers to the maximum permissible change in valve opening per unit time, i.e., the maximum permissible rate of change in valve opening. For example, the maximum permissible change in valve opening per unit time in each control cycle is ±5%.

[0119] Example, current =30%, = 33%, difference = +3%, =5%, clip(3%, ±5%) = 3%, = +3%=33%.

[0120] current =30%, = 80%, difference = +50%, =5%, clip(50%, ±5%) = 5%, = +5% = 35%.

[0121] In this step, the clip function is used to limit the adjustment of the valve opening to ensure that the change in valve opening within adjacent control cycles does not exceed the preset maximum allowable rate of change, thereby avoiding a sudden and violent release of steam pressure due to abrupt changes in valve opening.

[0122] In this embodiment, the target valve opening is used to constrain the continuous dynamic adjustment process of the valve opening. Specifically, the target valve opening is determined based on the boiling point deviation through a preset mapping function.

[0123] For example, the default mapping function is as follows:

[0124]

[0125] Where ΔT is the boiling point deviation, The target valve opening degree.

[0126] In one specific embodiment, the pressure relief regulation sets an initial valve opening during the initial stage. This initial valve opening is determined based on a combination of historical valve openings and the current boiling point deviation, serving as the feedforward adjustment starting point for pressure relief control. The initial valve opening is limited to a preset safe opening range to guide the pressure relief regulation into a stable control range. Then, combined with the pressure gradient formed by the spiral exhaust channel at the current valve opening, the valve opening of the pressure relief valve is continuously and dynamically adjusted.

[0127] Specifically, the initial valve opening = historical valve opening + opening sensitivity coefficient. boiling point deviation;

[0128] For example, the historical valve opening can be the historical steady-state opening from the previous control cycle. For instance, if the historical valve opening at the start of depressurization was 0.10, the current boiling point deviation is 0.8℃, the opening sensitivity coefficient Kb is 0.08, and the initial valve opening = 0.10 + 0.08 × 0.8 = 0.164, then... =0.30, when When the value is 3%, the valve opening is only 0.194 in the first cycle, 0.224 in the second cycle, and so on.

[0129] In this example, by introducing the feedforward regulation starting point, i.e. the initial valve opening, the pressure relief regulation is made to be under control in the entry stage, thereby avoiding sudden valve opening.

[0130] In this embodiment, an initial opening of the pressure relief valve is determined. Based on this initial opening, the pressure relief valve with a spiral exhaust channel is driven into a pressure relief state. The spiral exhaust channel forms a pressure gradient along the steam flow direction at different valve openings. During the pressure relief process, the initial opening is dynamically corrected based on the pressure gradient, and the rate of change of the valve opening is constrained, causing the steam pressure to be released segment by segment along the spiral exhaust channel. By correcting the initial opening based on the pressure gradient formed by the spiral exhaust channel at the current opening, the pressure before the valve is released segment by segment along the spiral exhaust channel, thereby limiting the rate of pressure change, avoiding shocks and oscillations caused by sudden pressure drops, and achieving smooth and continuous regulation of the pressure relief process.

[0131] Step S150: Constrain the rate of change of the valve opening based on the effective flow length and equivalent flow cross-sectional area of ​​the spiral exhaust channel corresponding to the current valve opening.

[0132] Specifically, step S150 includes:

[0133] S1501: Determine the effective flow length and equivalent flow cross-sectional area of ​​the corresponding spiral exhaust channel based on the current valve opening;

[0134] For example, when the current valve opening is 0.164, the effective flow length of the spiral exhaust channel is 20mm, and the equivalent flow cross-sectional area is 2 mm²; when the current valve opening is 0.2, the effective flow length of the spiral exhaust channel is 16mm, and the equivalent flow cross-sectional area is 3mm².

[0135] Among them, the smaller the valve opening, the longer the effective flow length of the path participating in the flow in the spiral exhaust channel, and the smaller the equivalent cross-sectional area.

[0136] S1502: Evaluate the pressure relief capacity of the current pressure relief valve based on the effective flow length and equivalent flow cross-sectional area;

[0137] In this step, the pressure relief capacity of the current pressure relief valve can be assessed based on the effective flow length and equivalent flow cross-sectional area through experiments or simulations to obtain a mapping.

[0138] For example, the mapping is as follows:

[0139] The effective flow length of the spiral exhaust channel is 20mm, the equivalent flow cross-sectional area is 2mm², and the pressure relief capacity of the current pressure relief valve is 0.20MPa / s.

[0140] The effective flow length of the spiral exhaust channel is 16mm, the equivalent flow cross-sectional area is 3mm², and the pressure relief capacity of the current pressure relief valve is 0.35MPa / s.

[0141] In this embodiment, the pressure relief valve has different effective flow lengths and equivalent flow cross-sectional areas at different valve openings, thus having different pressure relief capabilities. A correspondence between the pressure relief capabilities is established in advance, and the rate of change of the valve opening is constrained during the pressure relief control process, so that the valve opening changes gradually, thereby releasing the steam pressure segment by segment and continuously along the spiral exhaust channel, avoiding the impact and oscillation caused by sudden pressure drops.

[0142] S1503: Determine the maximum allowable opening change rate based on the pressure relief capability, and dynamically constrain the valve opening adjustment process based on the maximum allowable opening change rate.

[0143] Specifically, step S1503 includes:

[0144] S15031: Determine the permissible rate of pressure change based on the pressure relief capability;

[0145] For example, when the pressure release capacity is 0.20 MPa / s, the allowable pressure change rate can be directly taken as 0.20 MPa / s.

[0146] S15032: Map the pressure change rate to an allowable opening change rate mapping value;

[0147] For example, the linear mapping is set as follows: the allowable pressure change rate is 0.20 MPa / s, that is, every 1% change in valve opening is approximately 0.02 MPa / s of pressure change, and the mapped allowable opening change rate is 0.20 / 0.02 = 10% / s.

[0148] S15033: Determine the risk level of the current working state based on the boiling point deviation;

[0149] S15034: Determine the maximum permissible opening rate of change based on the risk level and the permissible opening rate of change mapping value.

[0150] Specifically, step S15033 includes the following steps:

[0151] S150331: Compare the boiling point deviation with a preset deviation threshold;

[0152] S150332: When the boiling point deviation exceeds the high threshold, the risk level is determined to be high; when the boiling point deviation is greater than or equal to the low threshold and less than or equal to the high threshold, the risk level is determined to be medium; when the boiling point deviation is lower than the low threshold, the risk level is determined to be low.

[0153] In practice, the risk level can also be linked to the specific cooking stage of the rice cooker: the same boiling point deviation may be considered high risk in the heating stage and medium risk in the simmering stage, and the risk level can be determined by using a preset mapping table.

[0154] Specifically, step S15034 includes the following steps:

[0155] S150341: Adjustment factors are selected according to risk level, wherein the adjustment factor for high risk < the adjustment factor for medium risk < the adjustment factor for low risk;

[0156] For example, if the boiling point deviation inside the pot is large (exceeding the high threshold, such as above +2°C), it is judged as high risk, the adjustment factor is 0.3, and the rate of change of valve opening is strictly limited;

[0157] Boiling point deviation is moderate (greater than or equal to the low threshold, less than or equal to the high threshold, e.g., +1°C ~ +2°C), classified as medium risk, adjustment factor = 0.6; moderate constraint;

[0158] A small boiling point deviation (below a low threshold, such as 0~+1°C, less than +1°C) is judged as low risk, with an adjustment factor of 1.0 and almost no restrictions.

[0159] S150342: The maximum allowable opening rate of change is the product of the adjustment factor and the allowable pressure rate of change mapping value, that is, the maximum allowable opening rate of change = adjustment factor × allowable opening rate of change mapping value;

[0160] The allowable pressure change rate mapping value is determined based on the valve's pressure release capability, and the adjustment factor decreases as the risk level increases, so as to limit the rate of change of valve opening under high-risk conditions.

[0161] For example, when the risk is high, the adjustment factor = 0.3, the allowable rate of change of opening degree mapped value = 0.20 / 0.02 = 10% / s, and the maximum allowable rate of change of opening degree = adjustment factor × allowable rate of change of opening degree mapped value = 0.3 10% / s = 3% / s.

[0162] For example, with the current valve opening at 0.164, the effective flow length of the spiral exhaust channel is 20 mm, the equivalent flow cross-sectional area is 2.0 mm², and the corresponding pressure relief capacity is 0.20 MPa / s. Under high-risk conditions with a boiling point deviation of 2.2℃, the system limits the maximum allowable valve opening change rate to 3% / s, thereby achieving smooth and continuous regulation of the pressure relief process.

[0163] In this embodiment, the pressure relief control process is divided into a spatial pressure gradient construction process and a time-dimensional pressure change rate control process. The spiral exhaust channel is used to construct a spatial pressure gradient of steam along the flow direction. The constraint of the valve opening change rate is used to limit the rate of change of steam pressure over time, so as to achieve the gradual release of pressure in space and the smooth change in time.

[0164] Example 2

[0165] This invention discloses a pressure relief control system for a rice cooker based on fusion boiling point detection, such as... Figure 2 As shown, Figure 2 This is a pressure relief control system for a rice cooker based on fusion boiling point detection, including:

[0166] The estimation unit 210 is used to obtain the top temperature inside the pot and the steam pressure inside the pot, and to obtain the boiling point estimate based on the top temperature inside the pot and the steam pressure inside the pot.

[0167] The determination unit 220 is used to calculate the boiling point deviation between the estimated boiling point value and the temperature at the top of the pot, and to determine whether a preset condition is met; the preset condition includes at least the boiling point deviation being greater than or equal to the pressure relief trigger threshold.

[0168] The pressure relief unit 230 is used to determine the pressure relief adjustment target based on the boiling point deviation if the preset conditions are met, and to release the steam pressure through the pressure relief valve with a spiral exhaust channel; wherein, the spiral exhaust channel has different effective flow lengths and equivalent flow cross-sectional areas at different valve openings, and the steam pressure forms a controllable pressure gradient in the spiral exhaust channel and is released segment by segment in the spiral exhaust channel;

[0169] The regulating unit 240 is used to continuously and dynamically adjust the valve opening of the pressure relief valve based on the pressure relief regulating target during the pressure relief process, so that the valve opening of the pressure relief valve changes continuously within a preset range.

[0170] The constraint unit 250 is used to constrain the rate of change of the valve opening based on the effective flow length and equivalent flow cross-sectional area of ​​the spiral exhaust channel corresponding to the current valve opening.

[0171] Example 3

[0172] An electric rice cooker disclosed in this invention includes a pressure relief control system based on fusion boiling point detection, and further includes:

[0173] A temperature sensor on the top of the lid is located inside the lid or near the steam accumulation area to collect the temperature at the top of the pot.

[0174] A steam pressure sensor, located inside the top cover or at the inlet of the pressure relief channel, is used to collect steam gauge pressure values.

[0175] A pressure relief valve assembly with a spiral exhaust channel includes: a valve body, a valve core, a valve seat, and a spiral exhaust channel disposed inside the valve body. The spiral exhaust channel extends spirally along the axial direction, and its cross-sectional area gradually changes along the flow direction, so that steam is discharged along the spiral path during valve opening, thereby forming a continuously distributed pressure gradient in the channel.

[0176] During the operation of the rice cooker, the control system performs the following steps:

[0177] Obtain the top temperature and steam pressure inside the pot, and based on the top temperature and steam pressure inside the pot, obtain the boiling point estimate.

[0178] Calculate the boiling point deviation between the estimated boiling point and the temperature at the top of the pot, and determine whether a preset condition is met; the preset condition includes at least that the boiling point deviation is greater than or equal to the pressure relief trigger threshold.

[0179] If the preset conditions are met, the pressure relief adjustment target is determined based on the boiling point deviation, and the steam is discharged and pressure is relieved through a pressure relief valve with a spiral exhaust channel. The spiral exhaust channel has different effective flow lengths and equivalent flow cross-sectional areas at different valve openings, and the steam pressure forms a controllable pressure gradient in the spiral exhaust channel, which is then released segment by segment.

[0180] During the pressure relief process, the valve opening of the pressure relief valve is continuously and dynamically adjusted based on the pressure relief adjustment target, so that the valve opening of the pressure relief valve changes continuously within a preset range.

[0181] The rate of change of the valve opening is constrained based on the effective flow length and equivalent flow cross-sectional area of ​​the spiral exhaust channel corresponding to the current valve opening.

[0182] In rice cooker applications, this invention introduces a spiral exhaust channel into the pressure relief valve assembly and continuously adjusts the valve opening in stages based on the boiling point deviation, so that the steam pressure is released segment by segment along the spiral path, thereby achieving stable pressure relief control that adapts to different environmental pressure conditions without adding complex actuators.

[0183] Example 4

[0184] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of the present invention. For example... Figure 3 As shown, the electronic device may include:

[0185] Memory 310 storing executable program code;

[0186] Processor 320 coupled to memory 310;

[0187] The processor 320 calls the executable program code stored in the memory 310 to execute some or all of the steps in the rice cooker pressure relief control method based on fusion boiling point detection in Embodiment 1.

[0188] This invention discloses a computer-readable storage medium storing a computer program that causes a computer to perform some or all of the steps in a rice cooker pressure relief control method based on fusion boiling point detection as described in Embodiment 1.

[0189] This invention also discloses a computer program product, wherein when the computer program product is run on a computer, the computer executes some or all of the steps in the rice cooker pressure relief control method based on fusion boiling point detection in Embodiment 1.

[0190] This invention also discloses an application publishing platform, which is used to publish computer program products. When the computer program products are run on a computer, the computer executes some or all of the steps in the rice cooker pressure relief control method based on fusion boiling point detection in Embodiment 1.

[0191] In various embodiments of the present invention, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0192] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; they can be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0193] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0194] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-accessible memory. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several requests to cause a computer device (which can be a personal computer, server, or network device, specifically a processor in the computer device) to execute some or all of the steps of the methods described in the various embodiments of the present invention.

[0195] In the embodiments provided by this invention, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0196] Those skilled in the art will understand that some or all of the steps in the various methods of the embodiments described can be implemented by a program instructing related hardware. This program can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0197] The foregoing has provided a detailed description of a rice cooker pressure relief control method, device, electronic device, and storage medium based on fusion boiling point detection disclosed in the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for controlling pressure relief in a rice cooker based on fusion boiling point detection, characterized in that, It includes the following: Obtain the top temperature and steam pressure inside the pot, and obtain the boiling point estimate based on the top temperature and steam pressure inside the pot. Calculate the boiling point deviation between the estimated boiling point and the temperature at the top of the pot, and determine whether a preset condition is met; the preset condition includes at least that the boiling point deviation is greater than or equal to the pressure relief trigger threshold. If the preset conditions are met, the pressure relief adjustment target is determined according to the boiling point deviation, and the steam is discharged and pressure is relieved through the pressure relief valve with the spiral exhaust channel; wherein, the spiral exhaust channel has different effective flow length and equivalent flow cross-sectional area at different valve openings, and the steam pressure forms a controllable pressure gradient in the spiral exhaust channel and is released segment by segment in the spiral exhaust channel; During the pressure relief process, the valve opening of the pressure relief valve is continuously and dynamically adjusted based on the pressure relief adjustment target, so that the valve opening of the pressure relief valve changes continuously within a preset range. The rate of change of the valve opening is constrained based on the effective flow length and equivalent flow cross-sectional area of ​​the spiral exhaust channel corresponding to the current valve opening.

2. The electric rice cooker pressure relief control method based on fusion boiling point detection according to claim 1, characterized in that, The constraint on the rate of change of the valve opening includes: Determine the effective flow length and equivalent flow cross-sectional area of ​​the corresponding spiral exhaust channel based on the current valve opening. The pressure relief valve's pressure release capability is assessed based on the effective flow length and equivalent flow cross-sectional area. The maximum allowable opening change rate is determined based on the pressure relief capability, and the valve opening adjustment process is dynamically constrained based on the maximum allowable opening change rate.

3. The rice cooker pressure relief control method based on fusion boiling point detection according to claim 2, characterized in that, The step of determining the maximum permissible rate of change of opening based on the pressure release capability includes: The allowable pressure change rate is determined based on the pressure release capability; the pressure change rate is then mapped to an allowable opening change rate mapping value. Based on the boiling point deviation, determine the risk level of the current working state; The maximum permissible rate of change of opening is determined based on the risk level and the permissible rate of change of opening mapping value.

4. The electric rice cooker pressure relief control method based on fusion boiling point detection according to claim 1, characterized in that, Based on the aforementioned pressure relief adjustment target, the valve opening of the pressure relief valve is continuously and dynamically adjusted, and the adjusted valve opening satisfies the following formula: ； in, This represents the valve opening at the current moment. The adjusted valve opening. The target valve opening is defined as the pressure relief regulation target, which is determined based on the boiling point deviation using a preset mapping function; clip is a limiting function. This represents the maximum permissible change in valve opening per unit time, i.e., the maximum permissible rate of change in valve opening.

5. The rice cooker pressure relief control method based on fusion boiling point detection according to claim 1, characterized in that, The preset condition is that the boiling point deviation is greater than or equal to the pressure relief trigger threshold for a preset duration, and the rate of change of steam pressure inside the pot exceeds the preset pressure change rate threshold.

6. The rice cooker pressure relief control method based on fusion boiling point detection according to claim 1, characterized in that, When it is determined that the preset conditions are not met, the pressure relief state is obtained, and the current heating power is adjusted according to the boiling point deviation and the pressure relief state; the pressure relief state includes the valve opening state of the pressure relief valve and / or the pressure relief continuous state and / or the steam discharge state.

7. The rice cooker pressure relief control method based on fusion boiling point detection according to claim 1, wherein obtaining the top temperature of the pot and the steam gauge pressure value inside the pot, and obtaining the boiling point estimate value based on the top temperature of the pot and the steam gauge pressure value inside the pot, includes: Based on the steam gauge pressure inside the boiler, the pressure-corrected boiling point is obtained through a boiling point calculation model. The temperature at the top of the pot is compared with the pressure-corrected boiling point to assess the consistency of the current thermal state. Based on the consistency assessment results, the output of the boiling point calculation model is corrected to obtain the final boiling point estimate.

8. A pressure relief control system for a rice cooker based on fusion boiling point detection, characterized in that, It includes: The estimation unit is used to obtain the top temperature inside the pot and the steam pressure inside the pot, and to obtain the boiling point estimate based on the top temperature inside the pot and the steam pressure inside the pot. The determination unit is used to calculate the boiling point deviation between the estimated boiling point and the temperature at the top of the pot, and to determine whether a preset condition is met; the preset condition includes at least the boiling point deviation being greater than or equal to the pressure relief trigger threshold. The pressure relief unit is used to determine the pressure relief adjustment target based on the boiling point deviation if the preset conditions are met, and to release the steam pressure through the pressure relief valve with a spiral exhaust channel; wherein, the spiral exhaust channel has different effective flow lengths and equivalent flow cross-sectional areas at different valve openings, and the steam pressure forms a controllable pressure gradient in the spiral exhaust channel and is released segment by segment in the spiral exhaust channel; The regulating unit is used to continuously and dynamically adjust the valve opening of the pressure relief valve based on the pressure relief regulating target during the pressure relief process, so that the valve opening of the pressure relief valve changes continuously within a preset range. The constraint unit is used to constrain the rate of change of the valve opening based on the effective flow length and equivalent flow cross-sectional area of ​​the spiral exhaust channel corresponding to the current valve opening.

9. An electronic device, characterized in that, It includes: a memory storing executable program code; a processor coupled to the memory; the processor calling the executable program code stored in the memory to execute the rice cooker pressure relief control method based on fusion boiling point detection as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, It stores a computer program, wherein the computer program causes the computer to execute the electric rice cooker pressure relief control method based on fusion boiling point detection as described in any one of claims 1-7.

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