Methods for detecting the cooking status of cooking utensils

Abstract

This invention discloses a cooking appliance including a cooking detection circuit and a moving element. The cooking detection circuit includes a control module, a first detection circuit, and a second detection circuit. The first detection circuit includes a detection resistor and a switching element connected in series. The second detection circuit includes a temperature-sensing resistor whose resistance value changes with temperature. The first and second detection circuits are connected in parallel and connected to the same signal input terminal of the control module. The moving element actuates according to changes in the cooking state, and the switching element switches its switching state according to the actuation of the moving element. The cooking state detection method includes detecting the voltage applied to the first and second detection circuits, and determining the position of the moving element and the cooking temperature based on voltage changes. This reduces the need for coupler pins, requiring only the detection of the voltage applied to the first and second detection circuits, and determining the position of the moving element and the cooking temperature based on voltage changes.

Description

[Technical Field]

[0001] This invention relates to the field of kitchen appliances, and more particularly to a method for detecting the cooking status of cooking utensils. [Background Technology]

[0002] Currently, pressure cooker products typically use NTC resistors to measure the top temperature. For structural design and ease of use, pressure cooker lids are usually separate units. The upper coupler connects to the NTC temperature probe and is installed inside the lid. The lower coupler connects to the NTC resistor acquisition circuit, which is installed on a circuit board inside the cooker.

[0003] Since there are moving parts inside the lid of the pressure cooker, and the movement of these moving parts is related to whether the pressure cooker can operate safely, a detection circuit is also installed inside the lid to detect whether the moving parts move as the cooking state changes. The detection circuit also needs to transmit the detection signal to the acquisition circuit inside the pot. Thus, both the temperature probe and the moving part detection circuit need to transmit electrical signals through a coupler, which requires the coupler to use at least three coupling pins, making the coupler structure more complex.

[0004] Furthermore, when using pin-type couplers for resistive electrical signal acquisition, prolonged use can lead to contact resistance in the coupler pins, resulting in inaccurate temperature readings from the actual temperature sensor. Since pressure cookers control pressure through top temperature measurement, inaccurate top temperature readings will significantly affect the accuracy of the internal air pressure and the quality of the food. [Summary of the Invention]

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and propose a cooking state detection method that can simplify the coupler structure.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a method for detecting the cooking state of cooking utensils.

[0007] The cooking appliance includes a cooking detection circuit and a moving element, wherein: the cooking detection circuit includes a control module, a first detection circuit, and a second detection circuit; the first detection circuit includes a detection resistor and a switching element connected in series; the second detection circuit includes a temperature-sensing resistor whose resistance value changes with temperature; the first detection circuit and the second detection circuit are connected in parallel and connected to the same signal input terminal of the control module; the moving element actuates according to changes in the cooking state, and the switching element switches its switching state according to the actuation of the moving element;

[0008] The cooking state detection method includes: detecting the voltage applied to the first detection circuit and the second detection circuit, and determining the position of the active element and the cooking temperature based on the voltage change.

[0009] In the above-described cooking state detection method, the detection of the voltage applied to the first detection circuit and the second detection circuit, and the determination of the position of the active element based on the voltage change, includes: when the cooking appliance is in a first cooking state, the active element is in a first position; continuously detecting the voltage applied to the first detection circuit and the second detection circuit in the first cooking state; when the voltage change is greater than a set threshold, determining that the active element has moved to a second position, and the cooking appliance enters a second cooking state.

[0010] In the above-described cooking state detection method, the detection of the voltage applied to the first detection circuit and the second detection circuit, and the determination of the position of the active element based on the voltage change, includes: when the cooking appliance is in a first cooking state, the active element is in a first position, and the voltage U1 applied to the first detection circuit and the second detection circuit in the first cooking state is detected; when the voltage U1 suddenly changes to the voltage U2, it is determined that the active element has moved to a second position, and the cooking appliance enters a second cooking state; wherein, the voltage U2 is the instantaneous voltage applied to the first detection circuit and the second detection circuit when the cooking appliance enters the second cooking state.

[0011] In the cooking status detection method described above, if the position of the active element is not determined within a predetermined time, an alarm is triggered.

[0012] In the above-described cooking state detection method, the step of detecting the voltage applied to the first detection circuit and the second detection circuit, and determining the cooking temperature based on the voltage change, includes: when the cooking appliance enters the second cooking state from the first cooking state, the switching element switches to the closed state, and at this time, the instantaneous voltage U2 applied to the first detection circuit and the second detection circuit is detected; in the second cooking state, the voltage applied to the first detection circuit and the second detection circuit is detected in real time; and the cooking temperature is determined based on the comparison result between the real-time detected voltage and the instantaneous voltage U2.

[0013] In the cooking state detection method described above, the cooking appliance records the instantaneous voltage U2 through the control module each time it cooks, and sets the instantaneous voltage U2 recorded during the first cooking as a reference value. The instantaneous voltage U2 recorded during each subsequent cooking is compared with the reference value, and the comparison result is used to determine whether contact resistance is generated in the cooking detection circuit.

[0014] In the cooking status detection method described above, when the instantaneous voltage U2 recorded during subsequent cooking is compared with the reference value and the result is greater than the set threshold, an alarm is triggered.

[0015] In the cooking status detection method described above, when the instantaneous voltage U2 recorded during subsequent cooking is compared with the reference value and the result is greater than the set threshold, the reference value is updated to the instantaneous voltage U2 recorded during this cooking and the number of updates is recorded. When the number of updates exceeds the set threshold, an alarm is triggered.

[0016] In the above-mentioned cooking state detection method, the cooking appliance includes a pot body and a pot lid. The pot lid covers the pot body to form a cooking cavity. The movable element is a float installed on the pot lid. The float floats up and down with the pressure change in the cooking cavity. The switching element switches the switching state with the up and down movement of the float.

[0017] Alternatively, the cooking appliance includes a pot body and a pot lid, the pot lid is provided with a vent valve, the movable element is a movable valve core built into the vent valve, the movable valve core is driven by gas entering the vent valve or by an electric push rod provided on the pot lid, and the switching element switches the switching state according to the movement of the movable valve core.

[0018] In the above-mentioned cooking state detection method, the cooking appliance includes a pot body and a pot lid, the pot lid is detachably fitted onto the pot body, the first detection circuit and the second detection circuit are disposed on the pot lid, the pot lid is also disposed on a female coupler, the control module is disposed on the pot body, and the pot body is also disposed on a male coupler adapted to the female coupler.

[0019] The beneficial effects of this invention are:

[0020] This solution utilizes voltage changes across a first and second parallel detection circuit to determine the position of a moving element and the cooking temperature. This addresses the problem of current methods requiring separate moving element detection and cooking temperature detection circuits, which consume excessive coupler pins and create complex coupler structures. The detection of the moving element is divided into two states: on and off. Movement of the moving element triggers a switching element, causing a sudden change in the resistance of the entire circuit. This results in a voltage change in the entire cooking detection circuit, which is then identified by the control module to determine if the moving element has moved. The temperature-sensing resistor changes its resistance with temperature; even if the first detection circuit is on or off, the corresponding cooking temperature can still be determined based on the voltage value of the entire cooking detection circuit. Therefore, the parallel connection of the first and second detection circuits does not affect the second detection circuit's ability to determine the cooking temperature. Based on the characteristics of the first and second detection circuits, the first and second detection circuits are connected in parallel and plugged into the same pin on the coupler. This allows signal transmission to be completed using only one pair of pins, reducing the occupation of coupler pins. The position of the moving element and the cooking temperature can be determined by detecting the voltage applied to the first and second detection circuits and the voltage change.

[0021] In a further embodiment, detecting the voltage applied to the first and second detection circuits and determining the position of the active element based on voltage changes includes: when the cooking appliance is in a first cooking state, the active element is in a first position; continuously detecting the voltage applied to the first and second detection circuits in the first cooking state; when the voltage change exceeds a set threshold, determining that the active element has moved to a second position, and the cooking appliance enters a second cooking state. By determining the current cooking state of the cooking appliance through voltage changes, the degree to which the contact resistance generated by the coupler pins affects the cooking state of the cooking appliance can be reduced.

[0022] In a further embodiment, detecting the voltage applied to the first and second detection circuits and determining the position of the movable element based on voltage changes includes: when the cooking appliance is in a first cooking state, the movable element is in a first position, and the voltage U1 applied to the first and second detection circuits in the first cooking state is detected; when the voltage U1 suddenly changes to the voltage U2, it is determined that the movable element has moved to a second position, and the cooking appliance has entered a second cooking state; wherein, the voltage U2 is the instantaneous voltage applied to the first and second detection circuits when the cooking appliance enters the second cooking state. By detecting the position of the movable element to determine the working state of the cooking appliance, and by using the voltage influence value caused by the switching element in the first detection circuit being turned on or off when the movable element moves to determine whether the cooking appliance has entered the second cooking state, the determination is more accurate.

[0023] In a further embodiment, if the position of the moving element is not determined within a predetermined time, an alarm will be triggered. If the position of the moving element is not determined within the predetermined time, it indicates that the moving element is stuck or there is a problem with the operation of the cooking appliance. The alarm will be triggered in a timely manner to prompt the user to troubleshoot the fault and prevent accidents from occurring.

[0024] In a further embodiment, detecting the voltage applied to the first and second detection circuits and determining the cooking temperature based on voltage changes includes: when the cooking appliance transitions from a first cooking state to a second cooking state, the switching element switches to a closed state, at which time the instantaneous voltage U2 applied to the first and second detection circuits is detected; in the second cooking state, the voltage applied to the first and second detection circuits is detected in real time; the cooking temperature is determined based on the comparison between the real-time detected voltage and the instantaneous voltage U2, and precise voltage control is achieved through the comparison between the real-time detected voltage and the instantaneous voltage, thereby more accurately controlling the cooking of food.

[0025] In a further embodiment, the cooking appliance records the instantaneous voltage U2 through the control module each time it cooks, and sets the instantaneous voltage U2 recorded during the first cooking as a reference value. The instantaneous voltage U2 recorded during each subsequent cooking is compared with the reference value. Based on the comparison result, it is determined whether contact resistance is generated in the cooking detection circuit. By comparing the value of the instantaneous voltage U2 generated each time, it is determined whether there are abnormal components in the cooking detection circuit that cause resistance changes. For example, poor contact of the coupler pins may cause the resistance to increase. When the instantaneous voltage U2 changes significantly, it will affect the accurate measurement of subsequent temperatures, and timely handling is required.

[0026] In a further proposed solution, if the instantaneous voltage U2 recorded during subsequent cooking is greater than a set threshold when compared with a reference value, an alarm will be triggered. The threshold setting will be used to determine if there is an abnormality in the cooking detection circuit that causes a change in resistance. The alarm will then remind the user to troubleshoot the problem and ensure that the cooking appliance can work normally.

[0027] In a further proposed solution, when the instantaneous voltage U2 recorded during subsequent cooking is compared with the reference value and the result exceeds a set threshold, the reference value is updated to the instantaneous voltage U2 recorded during this cooking session, and the update count is recorded. When the update count exceeds the set threshold, an alarm is triggered. An update is only performed when the instantaneous voltage U2 has a certain offset difference. This provides a certain offset for the instantaneous voltage U2, which helps reduce the number of alarms and improves the user experience.

[0028] In a further embodiment, the cooking appliance includes a pot body and a pot lid. The pot lid covers the pot body to form a cooking cavity. The movable element is a float installed on the pot lid. The float moves up and down with the pressure changes inside the cooking cavity. The switching element switches the switching state according to the up and down movement of the float.

[0029] Alternatively, the cooking appliance includes a pot body and a lid, with a vent valve on the lid. The movable element is a movable valve core built into the vent valve, driven by gas entering the vent valve or by an electric push rod on the lid. The switching element switches its on / off state according to the movement of the movable valve core. The float or movable valve core is an important component of the pressure cooking appliance, and its movement determines whether the appliance can work properly. Therefore, detecting its position through the first detection circuit can accurately determine the working state of the cooking appliance.

[0030] In a further embodiment, the cooking appliance includes a pot body and a lid, the lid being detachably fitted onto the pot body. The first detection circuit and the second detection circuit are disposed on the lid, and a female coupler is also disposed on the lid. The control module is disposed on the pot body, and a male coupler adapted to the female coupler is also disposed on the pot body. Separating the pot body and the lid facilitates cleaning and food handling. The electrical components of the pot body and the lid are connected using the female and male couplers, which allows for more signal transmission pins and is convenient to use.

[0031] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0032] The invention will be further described below with reference to the accompanying drawings:

[0033] Figure 1 This is a circuit diagram of the cooking detection circuit in this invention;

[0034] Figure 2 This is a flowchart of an embodiment of the cooking state detection method for cooking utensils of the present invention;

[0035] Figure 3 This is a flowchart of Embodiment 2 of the cooking state detection method for cooking utensils of the present invention;

[0036] Figure 4 This is a flowchart of Embodiment 3 of the cooking state detection method for cooking utensils of the present invention;

[0037] Figure 5 This is a schematic diagram of the structure of the cooking utensil used in this invention when the float sinks;

[0038] Figure 6 This is a schematic diagram of the cooking utensil used in this invention when the float is floating.

[0039] Figure label:

[0040] 1. Pot lid, 2. Float, 11. Switching element, 12. Detection resistor, 21. Temperature measuring resistor, 31. Control module.

Detailed Implementation Methods

[0041] Methods for detecting the cooking status of cooking appliances.

[0042] The cooking appliance includes a cooking detection circuit and a moving element, wherein: the cooking detection circuit includes a control module, a first detection circuit, and a second detection circuit; the first detection circuit includes a detection resistor and a switching element connected in series; the second detection circuit includes a temperature-sensing resistor whose resistance value changes with temperature; the first detection circuit and the second detection circuit are connected in parallel and connected to the same signal input terminal of the control module; the moving element actuates according to changes in the cooking state, and the switching element switches its switching state according to the actuation of the moving element;

[0043] The cooking state detection method includes: detecting the voltage applied to the first detection circuit and the second detection circuit, and determining the position of the active element and the cooking temperature based on the voltage change.

[0044] This solution utilizes voltage changes across a first and second parallel detection circuit to determine the position of a moving element and the cooking temperature. This addresses the problem of current methods requiring separate moving element detection and cooking temperature detection circuits, which consume excessive coupler pins and create complex coupler structures. The detection of the moving element is divided into two states: on and off. Movement of the moving element triggers a switching element, causing a sudden change in the resistance of the entire circuit. This results in a voltage change in the entire cooking detection circuit, which is then identified by the control module to determine if the moving element has moved. The temperature-sensing resistor changes its resistance with temperature; even if the first detection circuit is on or off, the corresponding cooking temperature can still be determined based on the voltage value of the entire cooking detection circuit. Therefore, the parallel connection of the first and second detection circuits does not affect the second detection circuit's ability to determine the cooking temperature. Based on the characteristics of the first and second detection circuits, the first and second detection circuits are connected in parallel and plugged into the same pin on the coupler. This allows signal transmission to be completed using only one pair of pins, reducing the occupation of coupler pins. The position of the moving element and the cooking temperature can be determined by detecting the voltage applied to the first and second detection circuits and the voltage change.

[0045] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] Example 1

[0051] like Figure 1 As shown, the cooking utensil used in the cooking state detection method of the present invention includes a pot body, a pot lid 1, a cooking detection circuit, and a moving element. The pot lid 1 covers the pot body to form a cooking cavity. The moving element is a float 2 set on the pot lid 1. The pot lid 1 has a through hole communicating with the outside. The float 2 has a step to ensure that the float 2 will not fall into the pot body when it is only subjected to gravity. The lower part of the float 2 passes through the pot lid. A sealing ring is fitted at the bottom of the float 2 to prevent the float 2 from being pushed out of the pot lid by the pressure inside the cooking cavity. The float 2 floats up and down with the change of pressure inside the cooking cavity. The cooking detection circuit includes a control module 31, a first detection circuit, and a second detection circuit. The first detection circuit includes a detection resistor 12 and a switching element 11 connected in series. The second detection circuit includes a temperature-sensing resistor 21 whose resistance value changes with temperature. The first and second detection circuits are connected in parallel and connected to the same signal input terminal of the control module 31. The switching element 11 detects the movement position of the moving element to determine whether the moving element is active. The temperature-sensing resistor 21 in the second detection circuit measures the temperature change inside the cooking cavity. The resistance value of the temperature-sensing resistor 21 will be different at different temperatures. By detecting the voltage across its terminals, the current temperature inside the cooking cavity can be determined, thereby enabling precise temperature and pressure control inside the cooking cavity.

[0052] In this embodiment, the pot lid 1 is detachably fitted onto the pot body. The first detection circuit and the second detection circuit are disposed on the pot lid 1. A female coupler is also disposed on the pot lid 1. The control module 31 is disposed on the pot body. A male coupler adapted to the female coupler is also disposed on the pot body. The detachable pot body and pot lid 1 facilitate the handling of food and the cleaning of the pot body and pot lid 1. The connection between the pot body and pot lid 1 through the coupler provides multiple signal transmission channels, and the signal transmission is stable and reliable. It is also easy for users to plug and match the male and female couplers.

[0053] like Figure 2 As shown, the cooking state detection method includes: detecting the voltage applied to the first detection circuit and the second detection circuit, and determining the position of the active element and the cooking temperature based on the voltage change.

[0054] The specific method for determining the position of the moving element is as follows: Assume that the switching element 11 is in the normally open state, meaning that when the cooking appliance has not reached the specified temperature, the pressure inside the cooking cavity is insufficient, and the first detection circuit is in the open state. Figure 5 As shown, float 2 descends to its lowest point under the influence of gravity. At this time, the cooking appliance is in the first cooking state, and the moving element is also in the first position. In this state, the voltage applied to the first and second detection circuits is continuously monitored. Figure 6As shown, as the pressure inside the cooking cavity gradually increases, when the pressure is sufficient to lift the float 2, the rise of the float 2 triggers the closing of the switching element 11. At this time, the detection resistor 12 and the temperature measuring resistor 21 on the first detection circuit are connected in parallel. The voltage change across the first and second detection circuits exceeds the set threshold. At this point, it can be determined that the moving element has risen, that is, moved to the second position, and the cooking appliance enters the second cooking state. In the above judgment process, because the liquid inside the cooking cavity is heated, the pressure change inside the pot will not be too large when the float 2 does not rise, that is, the temperature rise inside the pot is limited. The voltage change caused by the detection resistor 12 alone is not large. Only when the float 2 rises and triggers the switching element 11 to connect the first detection circuit, at which point the detection resistor 12 and the temperature measuring resistor 21 are connected in parallel, will a large voltage change occur, exceeding the threshold, thus allowing for a more accurate determination of the movement position of the float 2, thereby detecting the cooking state of the cooking cavity.

[0055] During this process, if the position of the active element cannot be determined within the set time, that is, if the float 2 does not rise after a certain period of time after entering the first cooking state, an alarm should be triggered. This means that the float 2 may be stuck or other components may be malfunctioning. The user should be promptly reminded to stop the cooking process to avoid dangerous situations.

[0056] The specific method for determining the cooking temperature is as follows: When the cooking appliance transitions from the first cooking state to the second cooking state, the switch element 11 switches to the closed state. At this time, the instantaneous voltage U2 applied to the first and second detection circuits is detected. In the second cooking state, the voltage applied to the first and second detection circuits is detected in real time. The cooking temperature is determined based on the comparison between the real-time detected voltage and the instantaneous voltage U2. Before the switch element 11 closes, the temperature at that time can be determined based on the voltage applied to the second detection circuit, which is the temperature inside the cooking cavity when the instantaneous voltage U2 is generated. At the instant the switch element 11 closes, the detection resistor 12 and the temperature measuring resistor 21 in the first detection circuit are connected in parallel. At this time, the resistance value of the entire cooking detection circuit can be calculated. The voltage, resistance value, and corresponding temperature in the cooking detection circuit are known at this time. These are the initial values ​​of voltage, resistance value, and temperature in the second cooking state. Subsequently, as time progresses, the change in temperature will cause a change in the resistance value of the temperature measuring resistor 21. By comparing the voltage detected in real time after the resistance value of the temperature measuring resistor 21 with the instantaneous voltage U2, the corresponding current temperature inside the cooking cavity can be obtained, thereby enabling precise temperature and pressure control.

[0057] During use, the components in the cooking detection circuit may degrade due to moisture, causing the resistance value of the entire cooking detection circuit to change. This results in inaccurate voltage measured by the control module 31, which in turn affects the temperature and pressure control inside the cooking cavity. To solve this problem, the cooking appliance records the instantaneous voltage U2 through the control module 31 each time it cooks, and sets the instantaneous voltage U2 recorded during the first cooking as the reference value. The instantaneous voltage U2 recorded during each subsequent cooking is compared with the reference value, and the comparison result is used to determine whether contact resistance is generated in the cooking detection circuit.

[0058] Specifically, a reference value is set. When the instantaneous voltage U2 recorded during subsequent cooking is compared with the reference value, if the comparison result is greater than the set threshold, it indicates that there is a component failure or poor contact in the cooking detection circuit, and an alarm is triggered to prompt the user to clean or maintain it.

[0059] In this embodiment, voltage detection is actually performed by collecting AD values.

[0060] Specific application: Determining the position of active components:

[0061] When there is no pressure inside the cooking cavity, float 2 is in a downward state. At this time, the effective resistance across the coupler is Rt, which varies with temperature. Assuming the water boils, the resistance of temperature-sensing resistor 21 is Rt. 100 Therefore, the detection resistor 12 is also set to a fixed resistance value of Rt. 100 At the boiling point, when float 2 has not risen, the effective resistance value of the cooking detection circuit is Rt. 100 The effective voltage across the coupler is V. 100 The corresponding program collects the AD value as AD1.

[0062] When the temperature inside the cooking cavity reaches the boiling point, float 2 will rise, triggering switch element 11. At this time, the first detection circuit is activated, and detection resistor 12 and temperature measuring resistor 21 are connected in parallel. The effective resistance value of the cooking detection circuit is... The effective voltage across the coupler is V f100 The corresponding program collects the AD value as AD2.

[0063] When float 2 rises, the temperature sensing resistor 21 will be connected in parallel with the detection resistor 12 for a short period of time, and a measurement voltage difference ΔU = |Vf100-V100| will be generated across the coupler for a short time. The corresponding difference in the AD value collected by the program is ΔAD = |AD|. 2- AD1|. The program presets mutation thresholds ΔU1 and ΔAD1. The program can determine that float 2 rises by judging that ΔAD>ΔAD1.

[0064] Pressure control within the cooking cavity:

[0065] After float 2 rises, the instantaneous voltage U2 = V across the coupler is measured. f100 The program collects the corresponding sampling AD at this time. 100 The voltage across the coupler will continue to change as the temperature rises; therefore, subsequent adjustments will be made based on the real-time acquired AD signal. f With AD 100 The difference between the values ​​can indicate the temperature change and pressure change within the cooking cavity. Therefore, it is possible to determine the temperature change and pressure change within the cooking cavity through AD. f With AD 100 The pressure difference is used to control the pressure inside the cooking cavity.

[0066] Changes in the resistance of the cooking detection circuit caused by poor contact or aging of components after a period of use of cooking appliances:

[0067] When the user cooks for the first time, during the initial pressurization, after float 2 rises, the instantaneous voltage U2 = V across the coupler is measured. f100 Then, the machine records the corresponding sampling AD at this time. 100 This value will not be updated again. When cooking occurs again, the cooking chamber is pressurized, and float 2 rises to measure V. f100 Then, the program collects the corresponding sampled value AD at this time. 100 ′, by calculating ΔAD=|AD f100 -AD 100 We know that when ΔAD increases, it means the resistance increases and the voltage rises. This proves that the resistance between some components changed immediately after the voltage was applied. Since the resistance values ​​of the temperature measuring resistor 21 and the detection resistor 12 are relatively consistent, it is highly likely that poor contact at the coupler pins caused the resistance increase. When ΔAD = |AD| f100 -AD 100 | greater than the program's preset threshold AD err When the machine alarms, it prompts for maintenance.

[0068] In the cooking state detection method, if the switching element 11 is in the normally closed state, and the float 2 is triggered during the rise of the switching element 11, the first detection circuit will be in the open state. At this time, the cooking detection circuit will switch from the parallel connection of the detection resistor 12 and the temperature measuring resistor 21 to only the temperature measuring resistor 21 working. The resistance value in the entire cooking detection circuit will change significantly, which will cause the voltage in the cooking detection circuit to change significantly. If the voltage change exceeds the set threshold, the movement position of the moving element can also be determined, thereby determining that the cooking appliance has entered the second state from the first state.

[0069] Alternatively, the movable element on the lid 1 may not be the float 2, but a movable valve core built into the exhaust valve. The movable valve core is driven by the gas entering the exhaust valve or by an electric push rod set on the lid 1. When the movable valve core switches states, it will also trigger the switch element 11, causing a sudden change in the resistance of the entire cooking detection circuit, which will be detected by the control module 31 to determine whether the cooking state has switched normally.

[0070] Example 2

[0071] like Figure 3 As shown, the difference from Embodiment 1 lies in the procedure for handling situations where the instantaneous voltage U2 during cooking exceeds a set threshold when compared with a reference value. Instead of directly triggering an alarm, the reference value is updated to the instantaneous voltage U2 recorded during the current cooking cycle, and the number of updates is recorded. An alarm is only triggered when the number of updates exceeds a set limit. This method, compared to triggering an alarm immediately upon exceeding a set threshold, allows for voltage control adjustments and compensation settings during the instantaneous voltage U2 update process, thereby reducing the number of alarms and improving the user experience.

[0072] Other content not described in this embodiment can be found in Embodiment 1.

[0073] Example 3

[0074] like Figure 4 As shown, the difference from Embodiment 1 lies in the specific method for determining the position of the moving element. Instead of judging by a voltage change exceeding a set threshold, the method involves detecting the voltage U1 applied to the first and second detection circuits when the cooking appliance is in the first cooking state, with the moving element in the first position. When voltage U1 suddenly changes to voltage U2, it is determined that the moving element has moved to the second position, and the cooking appliance has entered the second cooking state. Here, voltage U2 is the instantaneous voltage applied to the first and second detection circuits when the cooking appliance enters the second cooking state. In other words, it directly determines whether the moving element has moved by judging whether the voltage suddenly changes to the value U2. This method is more direct; as long as a voltage change to the value U2 is detected, it is determined that the cooking state has switched to the second cooking state.

[0075] Other content not described in this embodiment can be found in Embodiment 1.

[0076] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A method for detecting the cooking state of cooking appliances, characterized in that, The cooking appliance includes a cooking detection circuit and a moving element, wherein: The cooking detection circuit includes a control module, a first detection circuit, and a second detection circuit. The first detection circuit includes a detection resistor and a switching element connected in series. The second detection circuit includes a temperature-sensing resistor whose resistance value changes with temperature. The first detection circuit and the second detection circuit are connected in parallel and connected to the same signal input terminal of the control module. The movable element moves in response to changes in the cooking state, and the switching element switches its state in response to the movement of the movable element. The cooking state detection method includes: The voltage applied to the first and second detection circuits is detected, and the position of the active element and the cooking temperature are determined based on the voltage changes. When the cooking appliance enters the second cooking state from the first cooking state, the switching element switches to the closed state. At this time, the instantaneous voltage U2 loaded on the first detection circuit and the second detection circuit is detected. The instantaneous voltage U2 recorded during the first cooking is set as the reference value. The instantaneous voltage U2 recorded during each subsequent cooking is compared with the reference value. Based on the comparison result, it is determined whether contact resistance is generated in the cooking detection circuit.

2. The cooking state detection method for cooking appliances as described in claim 1, characterized in that, The detection of the voltage applied to the first and second detection circuits, and the determination of the position of the moving element based on the voltage change, includes: When the cooking appliance is in the first cooking state, the movable element is in the first position; The voltage applied to the first and second detection circuits is continuously detected during the first cooking state. When the voltage change exceeds a set threshold, the active element is determined to have moved to the second position, and the cooking appliance enters the second cooking state.

3. The cooking state detection method for cooking appliances as described in claim 1, characterized in that, The detection of the voltage applied to the first and second detection circuits, and the determination of the position of the moving element based on the voltage change, includes: When the cooking appliance is in the first cooking state, the active element is in the first position, and the voltage U1 applied to the first detection circuit and the second detection circuit in the first cooking state is detected. When the voltage U1 suddenly changes to the voltage U2, it is determined that the moving element has moved to the second position, and the cooking appliance enters the second cooking state; Wherein, voltage U2 is the instantaneous voltage applied to the first detection circuit and the second detection circuit when the cooking appliance enters the second cooking state.

4. The cooking state detection method for cooking appliances as described in claim 1, characterized in that, If the position of the active element is not determined within the predetermined time, an alarm will be triggered.

5. The cooking state detection method for cooking appliances as described in claim 1, characterized in that, The detection of the voltage applied to the first and second detection circuits, and the determination of the cooking temperature based on the voltage changes, includes: When the cooking appliance enters the second cooking state from the first cooking state, the switching element switches to the closed state, and at this time, the instantaneous voltage U2 applied to the first detection circuit and the second detection circuit is detected; Real-time detection of the voltage applied to the first and second detection circuits during the second cooking state; The cooking temperature is determined by comparing the real-time detected voltage with the instantaneous voltage U2.

6. The cooking state detection method for cooking appliances as described in claim 1, characterized in that, An alarm will be triggered if the instantaneous voltage U2 recorded during subsequent cooking is greater than the reference value.

7. The cooking state detection method for a cooking appliance as described in claim 1, characterized in that, If the instantaneous voltage U2 recorded during subsequent cooking is greater than the reference value, the reference value will be updated to the instantaneous voltage U2 recorded during this cooking and the number of updates will be recorded. If the number of updates exceeds the set threshold, an alarm will be triggered.

8. The method for detecting the cooking state of a cooking appliance as described in any one of claims 1 to 7, characterized in that, The cooking appliance includes a pot body and a pot lid. The pot lid covers the pot body to form a cooking cavity. The movable element is a float installed on the pot lid. The float floats up and down with the pressure change in the cooking cavity. The switching element switches the switching state according to the up and down movement of the float. Alternatively, the cooking appliance includes a pot body and a pot lid, the pot lid is provided with a vent valve, the movable element is a movable valve core built into the vent valve, the movable valve core is driven by gas entering the vent valve or by an electric push rod provided on the pot lid, and the switching element switches the switching state according to the movement of the movable valve core.

9. The method for detecting the cooking state of a cooking appliance as described in any one of claims 1 to 7, characterized in that, The cooking appliance includes a pot body and a pot lid. The pot lid is detachably fitted onto the pot body. The first detection circuit and the second detection circuit are disposed on the pot lid. A female coupler is also disposed on the pot lid. The control module is disposed on the pot body. A male coupler adapted to the female coupler is also disposed on the pot body.

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