CN111134529B

CN111134529B - Heating control method, heating control device, medium and liquid heating container

Info

Publication number: CN111134529B
Application number: CN201811315361.XA
Authority: CN
Inventors: 刘传兰; 王志锋; 徐辉任; 梁显堂; 马志海; 刘经生; 杜放
Original assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date: 2018-11-06
Filing date: 2018-11-06
Publication date: 2022-03-08
Anticipated expiration: 2038-11-06
Also published as: CN111134529A

Abstract

The invention relates to the field of household appliance control, and discloses a heating control method, a device, a medium and a liquid heating container. With this accurate detection and control of spilling over of having realized liquid heating container, effectively prevented that liquid heating container from producing the trouble accident problem that the foam spills over and leads to when heating, also promoted user experience, and owing to install the electric capacity response piece on liquid heating container's lateral wall, need not deepen in the kettle, the installation of this electric capacity response piece of being convenient for, and can hide in the kettle body to this increases the whole pleasing to the eye of product.

Description

Heating control method, heating control device, medium and liquid heating container

Technical Field

The invention relates to the technical field of household appliance control, in particular to a heating control method, a heating control device, a heating control medium and a liquid heating container.

Background

With the increasingly widespread use of household electrical appliances for liquid heating vessels, in addition to electric kettles for boiling water, liquid heating vessels with other functions, such as health preserving kettles for cooking health preserving food materials, have also been produced.

Above-mentioned liquid heating container is especially to health preserving kettle in the use, produces the foam easily to cause easily and spill over, lead to making dirty the mesa, even make liquid infiltration circuit board lead to the short circuit, produce conflagration and contact accident, user experience is poor. Control of the anti-spillage is thus particularly important. The current product generally adopts intermittent heating control to realize, and when intermittent heating leads to power can not be big to this results in the heating time overlength, and heating power is little also leads to cooking effect poor moreover.

Disclosure of Invention

The invention aims to provide a heating control method, a heating control device, a medium and a liquid heating container, and aims to solve the problems of long heating time and poor cooking effect caused by low heating power caused by overflow prevention control of the conventional liquid heating container.

In order to achieve the above object, the present invention provides a heating control method for a liquid heating container, in which a first capacitive sensing piece and a second capacitive sensing piece are mounted on an outer sidewall of the liquid heating container, the heating control method comprising:

acquiring a first capacitance sensed by a first capacitance sensing piece and a second capacitance sensed by a second capacitance sensing piece when the liquid heating container is heated;

respectively judging whether the first capacitance and the second capacitance are larger than a first preset threshold value;

under the condition that the first capacitance and the second capacitance are both judged to be larger than a first preset threshold value, calculating a difference value between the first capacitance and the second capacitance;

and stopping heating the liquid heating container under the condition that the difference value is smaller than a second preset threshold value.

Optionally, the method further comprises: after stopping heating the liquid heating container, under the condition that the first electric capacity and the second electric capacity are both reduced to be smaller than a first preset threshold value, starting heating the liquid heating container.

Optionally, the method further comprises:

before respectively judging whether the first capacitance and the second capacitance are larger than a first preset threshold value, judging whether the liquid temperature in the liquid heating container is larger than a preset temperature;

and under the condition that the temperature of the liquid outlet body is judged to be higher than the preset temperature, whether the first capacitance and the second capacitance are higher than a first preset threshold value or not is respectively judged.

Optionally, the method further comprises:

before judging whether the first capacitance and the second capacitance are larger than the first preset threshold value respectively, determining the corresponding first preset threshold value according to the set heating mode of the liquid heating container.

In order to achieve the above object, the present invention also provides a heating control device for a liquid heating vessel, the heating control device comprising:

the first capacitance induction sheet and the second capacitance induction sheet are respectively arranged on the outer side wall of the liquid heating container;

the heating plate is used for heating the liquid heating container;

a controller configured to:

controlling the heating disc to work so as to heat the liquid heating container;

acquiring a first capacitance sensed by the first capacitance sensing piece and a second capacitance sensed by the second capacitance sensing piece;

judging whether the difference value is smaller than a second preset threshold value or not;

and under the condition that the difference value is smaller than the second preset threshold value, controlling the heating plate to stop working so as to stop heating the liquid heating container.

Optionally, the heating control device further comprises an anti-overflow module,

the detection end of the anti-overflow module is connected with the first capacitance sensing piece and the second capacitance sensing piece, the output end of the anti-overflow module is connected with the controller, and the anti-overflow module is used for respectively acquiring the first capacitance and the second capacitance and sending the first capacitance and the second capacitance to the controller.

Optionally, the controller is further configured to:

after the heating plate is controlled to stop working so as to stop heating the liquid heating container, whether the first capacitance and the second capacitance are reduced to be smaller than a first preset threshold value or not is respectively judged;

and under the condition that the first capacitance and the second capacitance are both reduced to be smaller than a first preset threshold value, controlling the heating plate to work so as to heat the liquid heating container.

Optionally, the heating control device further comprises a temperature sensor for detecting a temperature of the liquid inside the liquid heating vessel, the controller being further configured to: :

acquiring the temperature detected by a temperature sensor;

Optionally, the controller is further configured to:

In order to achieve the above object, the present invention also provides a storage medium having stored thereon computer readable instructions which, when executed by a processor, cause the processor to execute the above heating control method for a liquid heating vessel.

In order to achieve the above object, the present invention also provides a liquid heating container including the above heating control device.

According to the heating control method for the liquid heating container, the two capacitance induction sheets are arranged on the outer side wall of the liquid heating container, so that the capacitance values induced by the two capacitance induction sheets are detected during heating, whether each capacitance value is larger than a first preset threshold value or not is judged, the difference value of the two capacitance values is calculated under the condition that each capacitance value is larger than the first preset threshold value, the liquid heating container is identified to overflow under the condition that the difference value is smaller than a second preset threshold value, the liquid heating container is stopped being heated, accurate detection and control over the overflow of the liquid heating container are achieved, the problem of fault accidents caused by foam overflow of the liquid heating container during heating is effectively prevented, and user experience is improved.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of a health preserving kettle used in the heating control method for a liquid heating vessel according to the present invention;

FIG. 2 is a structural view of two capacitive sensing plates in the health preserving kettle of the invention;

FIG. 3 is a flow chart of a first embodiment of a heating control method for a liquid heating vessel according to the present invention;

FIG. 4 is a functional block diagram of a first embodiment of the heating control apparatus for a liquid heating vessel of the present invention;

FIG. 5 is another functional block diagram of the first embodiment of the heating control apparatus for a liquid heating vessel of the present invention;

FIG. 6 is a functional block diagram of a second embodiment of a heating control apparatus for a liquid heating vessel according to the present invention;

FIG. 7 is another functional block diagram of a second embodiment of the heating control apparatus for a liquid heating vessel according to the present invention;

FIG. 8 is a schematic diagram of the electrical circuit control for the heating control means in the liquid heating vessel of the present invention;

FIG. 9 is a waveform of a control signal from the heating control means in the liquid heating vessel of the present invention;

FIG. 10 is a waveform of another control signal for the heating control means in the liquid heating vessel of the present invention;

FIG. 11 is a schematic diagram of the circuit layout of the coupler in the liquid heating vessel of the present invention.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

A first embodiment of the present invention provides a heating control method for a liquid heating container, which is used for controlling the liquid heating container to boil water, where the liquid heating container may be a household appliance for heating various liquids, such as an electric kettle and a health preserving kettle, and at this time, the liquid heating container may cook various food materials, such as dark tea, red dates, white fungus, millet, and the like, and when the liquid heating container is used for boiling water or the health preserving kettle is used for heating food materials, foam is likely to be generated, and particularly when the health preserving kettle is used for heating food materials, the control of preventing foam from overflowing is particularly important. The heating control method of the embodiment of the invention is the anti-overflow control for the liquid heating container.

As shown in fig. 1, the liquid heating container of this embodiment is a health preserving kettle, and the structure includes a kettle body 1, a kettle lid 2, a heating plate 4 is installed at the bottom of the kettle body 1 for heating water or eating materials, the kettle body 1 is installed on a base 6, and is connected with the kettle body 1 through a coupler 3 arranged on the base 6, so as to realize that the base 6 provides the affiliated power supply for heating and transmits weak current signals for control for the kettle body 1. One side of the kettle body 1 is provided with a handle 11, an anti-overflow module 9 is installed inside the handle, a capacitance sensing piece 10 is electrically connected with the anti-overflow module 9, the capacitance sensing piece 10 is installed on the outer side wall of the kettle body 1 close to the handle 11, two independent capacitance sensing pieces, namely a first capacitance sensing piece 101 and a second capacitance sensing piece 102 are contained inside the capacitance sensing piece 10, the structural schematic diagram of the capacitance sensing piece is shown in fig. 2, the first capacitance sensing piece 101 and the second capacitance sensing piece 102 can be arranged left and right or up and down, preferably left and right, and the distance between the first capacitance sensing piece 101 and the second capacitance sensing piece 102 is preferably 1-15 mm. The first capacitance sensing piece 101 and the second capacitance sensing piece 102 can sense the parasitic capacitance generated by the surrounding environment, respectively, the anti-overflow module 9 is electrically connected to the first capacitance sensing piece 101 and the second capacitance sensing piece 102, respectively, and the analog quantity of the sensed capacitance is converted into a recognizable digital quantity after being recognized and processed, and for convenience of description, the sensed capacitance mentioned below is the digital quantity processed by the anti-overflow module 9.

This electric capacity response piece 10 is installed at the opening part that is close to kettle body 1, when heating up water or culinary art edible material through liquid heating container at ordinary times, its water level or the position of eating the material are under this mounted position, just can reach this position when heating the rise of production foam, that is also the mounted position of electric capacity response piece 10 is on the highest water level scale mark of kettle body 1 sign, the inside controller (not shown in the figure) that is provided with of base 6, the controller passes through the inductive electric capacity that the coupler received anti-overflow module 9 and sent, with the work of 3 control heating plate 4 through the coupler, still be provided with display 5 and button 7 on the base 6 simultaneously, with the control command of receiving the user through button 7, and show corresponding control information through display 5, on the basis of control command control heating plate 4 to eating the water or heat the culinary art of material 1 inside.

As shown in fig. 3, the heating control method for a liquid heating container of the present embodiment includes:

step S210, acquiring a first capacitance C1 sensed by a first capacitance sensing piece and a second capacitance C2 sensed by a second capacitance sensing piece when the liquid heating container is heated;

step S220, respectively judging whether the first capacitance C1 and the second capacitance C2 are larger than a first preset threshold value;

step S230, under the condition that the first capacitance C1 and the second capacitance C2 are judged to be larger than a first preset threshold value, calculating the difference value between the first capacitance C1 and the second capacitance C2;

and step S240, stopping heating the liquid heating container under the condition that the difference value is smaller than a second preset threshold value.

In step S210, the controller firstly controls the operation of the heat generating tray 4 of the liquid heating container according to the received user instruction, so as to heat the food or water inside the liquid heating container.

As an embodiment of this embodiment, the overflow preventing module 9 obtains the first capacitance C1 sensed by the first capacitance sensing tab 101 and the second capacitance C2 sensed by the second capacitance sensing tab 102 in the capacitance sensing tab 10 when the liquid heating container is heated, and sends them to the controller.

In other embodiments, first capacitive sensing tab 101 and second capacitive sensing tab 102 may also be directly connected to the controller, where the controller directly obtains the amount of capacitance it senses.

The first capacitance sensing piece 101 and the first capacitance sensing piece 102 can sense the parasitic capacitance around the first capacitance sensing piece 101 and the first capacitance sensing piece 102, when the environment around the first capacitance sensing piece 101 and the first capacitance sensing piece 102 changes, for example, bubbles rise when the liquid heating container is heated, and the installation position of the first capacitance sensing piece 101 and the first capacitance sensing piece 102 changes, the parasitic capacitance also changes, and the overflow prevention module 9 can detect the change value of the voltage on the parasitic capacitance in unit time, namely the change rate Δ V/Δ t of the voltage through its internal circuit and executing a related algorithm, the change value corresponds to the size of the parasitic capacitance, so that the capacity of the parasitic capacitance, namely the capacitance sensed by the capacitance sensing piece, can be indirectly obtained through the change value. The specific internal circuit and detection algorithm of the anti-overflow module 9 are the prior art, and are not described herein again.

In steps S220-S240, it is determined whether the first capacitance C1 and the second capacitance C2 sensed by the first capacitive sensing tab 101 and the second capacitive sensing tab 102 are greater than the first preset threshold Cset. In the liquid heating container for health preserving kettle heating working process, when water level or food material position do not reach electric capacity response piece 10 mounted position, its first electric capacity C1 and second electric capacity C2 change very little, generally fluctuate about a small circle value, and rise along with the temperature of heating water, produce the foam in the liquid heating container and begin to rise when being close electric capacity response piece 10 mounted position, its electric capacity change is obvious, if the signal constantly increases along with the time, reach electric capacity response piece 10 mounted position when the foam, it is more obvious to change. Whether the foam is close to the installation positions of the two capacitance sensing pieces at this time is determined by judging whether the first capacitance C1 and the second capacitance C2 are both greater than the first preset threshold value Cset.

When both the first capacitance C1 and the second capacitance C2 are greater than the first preset threshold Cset, the difference C1-C2 between the two capacitances, where the absolute value | C1-C2| is required if it is negative, is calculated and then compared with the second preset threshold dl to finally determine whether the foam overflows. It is found through experiments that when the foam approaches the installation position of the first capacitive sensing element 101 and the second capacitive sensing element 102 and continues to rise, the detected difference in capacitance changes significantly, specifically, the difference decreases, and when the difference decreases to the second preset threshold dl, it is determined that the foam has risen to the position. The first and second preset thresholds can be determined experimentally.

Further, when the heating of the liquid heating container is stopped, the foam thereof is decreased, and if the capacitance sensing piece 10 is moved away from the installation position, the two sensed capacitances are decreased, and when there is no risk of overflow in the case where the first capacitance C1 and the second capacitance C2 are decreased to be less than the first preset threshold, the heating of the liquid heating container is started.

According to the heating control method for the liquid heating container, two capacitance sensing pieces are arranged on the outer side wall of the liquid heating container, so that the capacitance sensed by the two capacitance sensing pieces is detected during heating, whether each capacitance is larger than a first preset threshold value or not is judged, the difference value of the two capacitances is calculated under the condition that each capacitance is larger than the first preset threshold value, and the liquid heating container is stopped being heated under the condition that the difference value is smaller than a second preset threshold value. With this accurate detection and control of spilling over of having realized liquid heating container, effectively prevented that liquid heating container from producing the trouble accident problem that the foam spills over and leads to when the heating, also promoted user experience, and owing to install the electric capacity response piece on liquid heating container's lateral wall, need not deepen liquid heating container for the health preserving kettle in, the installation of this electric capacity response piece of being convenient for, and can hide in liquid heating container is the health preserving kettle to this increases the whole pleasing to the eye of product.

Further, according to the first embodiment of the heating control method for a liquid heating vessel of the present invention, in the second embodiment of the heating control method, the method further includes:

before respectively judging whether the first capacitance C1 and the second capacitance C2 are larger than a first preset threshold value, judging whether the temperature of the liquid inside the liquid heating container is larger than a preset temperature;

under the condition that the temperature of the liquid outlet body is judged to be higher than the preset temperature, whether the first capacitance C1 and the second capacitance C2 are respectively judged to be higher than a first preset threshold value or not is judged.

That is, on the basis of the first embodiment, in addition to obtaining two capacitances induced by the capacitance induction piece 10 when the liquid heating container is heated, the temperature of the liquid inside the kettle body 1 when the liquid heating container is heated is also obtained at the same time. In this embodiment, as shown in fig. 1, in order to obtain the temperature signal, the liquid heating container may further include a temperature sensor 8 disposed at the bottom of the kettle body 1 to detect the temperature of the liquid, such as water, inside the kettle body 1, and the temperature signal detected by the temperature sensor 8 is sent to the controller. Because the liquid heating container is easy to generate foam only when heated to a certain temperature, and the foam is easy to generate only when the temperature rises to about 65 ℃ close to boiling, in the first embodiment, the temperature of the liquid heated in the kettle body 1 is further added to judge whether each capacitance is greater than a first preset threshold value, and the temperature regulation can be used as a primary condition, and if the temperature of the liquid in the kettle body is increased to a preset temperature value of 65 ℃, the judgment whether each capacitance is greater than the first preset threshold value is started, so that the misjudgment caused by the fact that the capacitance induced by the capacitance induction sheet is greater than the first preset threshold value when the capacitance induction sheet is interfered by external substances in the early stage of heating the liquid heating container can be eliminated, and the accuracy of the anti-overflow judgment is improved.

Further, based on the first embodiment of the heating control method for a liquid heating container of the present invention, in the third embodiment of the heating control method for a liquid heating container of the present invention, the method further includes:

before judging whether the first capacitance C1 and the second capacitance C2 are respectively larger than a first preset threshold value, determining the corresponding first preset threshold value according to the set heating mode of the liquid heating container.

For some liquid heating containers with complete functions, particularly health preserving kettles, a plurality of food materials can be cooked, correspondingly, when the food materials in the health preserving kettles are different, when the food materials generate foam, a part of the food materials also rise along with the foam, and then rise to the installation position of the capacitance sensing piece 10, experiments show that when the different food materials are at the position, the two capacitances detected by the capacitance sensing piece 10 are different, so that in order to judge overflow more accurately, the corresponding different first preset thresholds are determined according to different heating modes determined by the different food materials, for example, when the tremella rises to the installation position of the capacitance sensing piece 10, the two capacitances detected by the tremella can be larger than the other food materials, at this time, the corresponding first preset threshold may be set to be larger than the other food materials. Thereby achieving higher accuracy of overflow detection.

The invention also provides a heating control device for the liquid heating container, the liquid heating container applying the heating control device can be a health preserving kettle, the structure of the heating control device is shown in figure 1, the specific structure comprises a kettle body 1 and a kettle cover 2, the kettle body 1 is installed on a base 6 and is connected with the kettle body 1 through a coupler 3 arranged on the base 6, one side of the kettle body 1 is provided with a handle 11, the base 6 is also provided with a display 5 and keys 7, so that the control instruction of a user is received through the keys 7, and the corresponding control information is displayed through the display 5. Fig. 4 shows a functional block diagram of the heating control device, which includes:

the capacitance induction sheet 10 comprises a first capacitance induction sheet 101 and a second capacitance induction sheet 102 which are arranged close to each other, and the first capacitance induction sheet 10 and the second capacitance induction sheet are arranged on the outer side wall of the liquid heating container;

the heating plate 4 is used for heating the liquid heating container to heat water or food materials;

a controller 12, the controller 12 being disposed inside the base 6 (not shown in fig. 1), the controller 12 being configured to:

controlling the heating plate 4 to work so as to heat the liquid heating container;

acquiring a first capacitance C1 sensed by the first capacitance sensing piece 101 and a second capacitance C2 sensed by the second capacitance sensing piece 102;

respectively judging whether the first capacitance C1 and the second capacitance C2 are larger than a first preset threshold value;

under the condition that the first capacitance C1 and the second capacitance C2 are judged to be larger than a first preset threshold value, calculating the difference value between the first capacitance C1 and the second capacitance C2;

and under the condition that the difference value is smaller than the second preset threshold value, controlling the heating plate 4 to stop working so as to stop heating the liquid heating container.

In the heating control device, the first capacitive sensing piece 101 and the second capacitive sensing piece 102 may be arranged in a left-right manner or in an up-down manner, preferably in a left-right manner, as shown in fig. 2, and the distance between the first capacitive sensing piece 101 and the second capacitive sensing piece 102 is preferably 1-15 mm. The controller 12 firstly controls the heating plate 4 of the liquid heating container to work according to the received user instruction so as to heat the food material or water in the liquid heating container, and the controller obtains the value of the capacitance sensed by the capacitor sensing piece 10 and sends the value to the controller 12. The capacitance sensing piece 10 can sense the parasitic capacitance around the capacitance sensing piece, when the environment around the capacitance sensing piece 10 changes, such as bubbles rise when the liquid heating container is heated, and the installation position of the relative capacitance sensing piece 10 changes, the parasitic capacitance also changes, and the controller 12 can detect the change value of the voltage on the parasitic capacitance in unit time, namely Δ V/Δ t, through the internal circuit and executing the relevant algorithm, the change value corresponds to the size of the parasitic capacitance, so the capacitance sensed by the capacitance sensing piece can be indirectly obtained through the change value. The specific detection algorithm of the controller 12 is conventional and will not be described herein.

And judging whether the two acquired capacitances are larger than a first preset threshold value Cset or not according to the acquired first capacitance C1 sensed by the first capacitance sensing piece 101 and the acquired second capacitance C2 sensed by the second capacitance sensing piece 102. In the heating process of the liquid heating container, when the water level or the food position does not reach the installation position of the capacitance sensing piece 10, the first capacitance C1 and the second capacitance C2 have small changes, generally fluctuate around a small range value, and along with the rising of the heated water temperature, when foam generated in the liquid heating container begins to rise and is close to the installation position of the capacitance sensing piece 10, the capacitance change is obvious, if the signal is continuously increased along with the time, when the foam reaches the installation position of the capacitance sensing piece 10, the change is more obvious. Whether the foam is close to the installation positions of the two capacitance sensing pieces at this time is determined by judging whether the first capacitance C1 and the second capacitance C2 are both greater than a first preset threshold value Cset.

Further, as shown in fig. 5, the above-mentioned heating control device may further include an anti-overflow module 9, which is electrically connected to the first capacitance sensing tab 101 and the second capacitance sensing tab 102 of the capacitance sensing tab 10, respectively, obtains two sensed capacitances, and outputs the two sensed capacitances to the controller 12. The spill proof module 9 may now be mounted in the liquid heating vessel handle 11, which is configured as shown in fig. 1, so as to be in close proximity to the location of the capacitive sensing strip 10 for ease of connection therebetween. Or the two can be integrated, that is, the spill-proof module 9 is integrated in the capacitance sensing piece 10 and is installed on the outer side wall of the health preserving kettle, so that the installation process of the separate spill-proof module 9 can be omitted.

Further, the controller 12 is also configured to:

after the heating plate 4 is controlled to stop working so as to stop heating the liquid heating container, whether the first electric capacity C1 and the second electric capacity C2 are reduced to be smaller than a first preset threshold value or not is respectively judged;

and under the condition that the first electric capacity C1 and the second electric capacity C2 are both reduced to be less than the first preset threshold value, controlling the heating plate 4 to work so as to restart heating the liquid heating container.

When the heating of the liquid heating container is closed, the foam of the liquid heating container can be reduced, at the moment, if the liquid heating container leaves the installation position of the capacitance sensing piece 10, the two sensed capacitances are reduced, and when the two sensed capacitances are smaller than a first preset threshold value, the overflow risk is avoided, the heating plate 4 is controlled to work, and the liquid heating container is heated.

The heating control device for the liquid heating container of the embodiment of the invention is characterized in that two capacitance induction sheets are arranged on the outer side wall of the liquid heating container, so that the controller 12 obtains the capacitance induced by the two capacitance induction sheets during heating, judges whether each capacitance is larger than a first preset threshold value or not, calculates the difference value of the two capacitance values and judges whether the difference value is smaller than a second preset threshold value or not under the condition that each capacitance is judged to be larger than the first preset threshold value, the controller 12 controls the heating disc 4 to stop working under the condition that the difference value is judged to be smaller than the second preset threshold value so as to stop heating the liquid heating container, thereby effectively preventing the problem of fault accidents caused by foam overflow when the liquid heating container is heated, improving the user experience, and because the capacitance induction sheets are arranged on the outer side wall of the liquid heating container, the capacitor induction sheet does not need to be deeply arranged in the liquid heating container, so that the capacitor induction sheet is convenient to mount and can be hidden in the liquid heating container, and the integral attractiveness of the product is improved.

Further, in the second embodiment of the heating control device for a liquid heating container according to the present invention, based on the first embodiment of the heating control device for a liquid heating container according to the present invention, the heating control device further includes a temperature sensor 8 as shown in fig. 1, which is disposed at the bottom of the kettle body 1, and is used for detecting the temperature of the liquid such as water inside the kettle body 1 and sending the temperature to the controller 12. The temperature sensor 8 can be connected to the controller 12, and the controller 12 can obtain the temperature of the liquid directly through the temperature sensor 8 as shown in fig. 6; alternatively, as shown in fig. 7, the temperature sensor 8 may be connected to the spill prevention module 9, and the spill prevention module 9 acquires the temperature of the liquid and sends the temperature to the controller 12, and the controller 12 is further configured to:

receiving the detected temperature from the temperature sensor 8;

Because the liquid heating container is easy to generate foam only when heated to a certain temperature, and the foam is easy to generate only when the temperature rises to about 65 ℃ close to boiling, in the first embodiment, the judgment is further carried out by adding the temperature of the liquid heated in the liquid heating container when judging whether each capacitance is greater than the first preset threshold, and the temperature regulation can be used as a primary condition, and the judgment of whether each capacitance is greater than the first preset threshold is carried out when the temperature of the liquid in the liquid heating container rises to the preset temperature value of 65 ℃, so that the misjudgment caused by the fact that the capacitance induced by the capacitance induction sheet is greater than the first preset threshold when the capacitance induction sheet is interfered by external substances in the early heating period of the liquid heating container can be eliminated, and the accuracy of the anti-overflow judgment is improved.

Further, based on the first embodiment of the heating control apparatus for a liquid heating vessel of the present invention, in the third embodiment of the heating control apparatus for a liquid heating vessel of the present invention, the controller is further configured to:

before determining whether the first capacitance C1 and the second capacitance C2 are greater than the first preset threshold value respectively, determining the corresponding first preset threshold value according to the set heating mode of the liquid heating container.

For some liquid heating containers with complete functions, particularly health preserving kettles, a plurality of food materials can be cooked, correspondingly, when the food materials in the health preserving kettles are different, when the food materials generate foams, a part of the food materials also rise along with the foams, and then rise to the installation position of the capacitance sensing piece 10, and experiments show that when the different food materials are at the position, the anti-overflow module 9 detects different capacitances through the capacitance sensing piece 10, so that in order to judge overflow more accurately, corresponding different first preset thresholds are determined according to different heating modes determined by the different food materials, and if experiments show that the tremella rises to the installation position of the capacitance sensing piece 10, the two capacitances detected by the anti-overflow module 9 are larger than those of the other food materials, at this time, the corresponding first preset threshold may be set to be larger than the other food materials. Thereby achieving higher accuracy of overflow detection.

Further, based on the first embodiment of the heating control device for a liquid heating container of the present invention, in a fourth embodiment of the heating control device for a liquid heating container of the present invention, as shown in fig. 8, the device further includes:

the input end of the zero-crossing detection module 13 is connected with an alternating current power supply, the output end of the zero-crossing detection module 13 is connected with the controller, and the zero-crossing detection module 13 is used for detecting a zero-crossing signal of the alternating current power supply input to the heating control device;

the two ends of a switch of the first switch module 15 are connected in series in a power supply loop of the alternating current power supply to the heating plate, and the control end of the first switch module 15 is connected with the controller;

the controller controls the on-off state of the first switch module 15 according to the zero-crossing signal to control the heating plate to work.

Fig. 8 shows a schematic circuit diagram of the heating control device of the present embodiment, in which the controller is the MCU12, the heating plate 4 is the electric heating tube HR, the anti-overflow module 9 is the OV _ CK module 9, and the capacitive sensing strip 10 is the TB 10.

The circuit of the heating control device also comprises a switching power supply 16 which provides the direct current power supply for the circuit, and the direct current power supply specifically comprises two groups of 5V and 12V.

Specifically, in this heating control device's circuit, still include the temperature detection circuit based on temperature sensor 8, this temperature detection circuit is by the partial pressure circuit that thermistor RTC and resistance 7 are constituteed, and wherein thermistor RTC, when the liquid temperature is different, its thermistor RTC resistance is different, and the voltage that this partial pressure circuit output is different. The output end of the temperature detection circuit is connected with an anti-overflow module 9, and the anti-overflow module 9 outputs different voltages through a detector so as to detect the temperature of the liquid in the liquid heating container and send the temperature of the liquid to the controller 12. The thermistor RTC in fig. 8 is the temperature sensor 8 in fig. 1.

Specifically, the first switch module 15 includes a first triac SCR1, a second resistor R2, a fourth resistor R4, and a first optocoupler U1;

a first anode A1 and a second anode A2 of the first triac SCR1 are two ends of a switch of the first switch module respectively, and a control stage of the first triac SCR1 is connected with one end of a bidirectional diode of the first optocoupler U1;

the other end of the bidirectional diode of the first optical coupler U1 is connected with one end of a second resistor R2, the other end of the second resistor R2 is connected with a second anode of a first bidirectional thyristor SCR1, the cathode of the light emitting diode of the first optical coupler U1 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is grounded, and the anode of the light emitting diode of the first optical coupler U1 is a control end of the first switch module 15.

Further, the first switch module 15 may further include a third resistor R3 connected in series with the second resistor R2, and the third resistor R3 and the second resistor together perform a current limiting function.

Specifically, the zero-crossing detection module 13 includes a sixth resistor R6, a first diode D1, a second optocoupler U2, and a seventh resistor R7;

one end of the sixth resistor R6 is an input end of the zero-crossing detection module 13, the other end of the sixth resistor R6 and the cathode of the first diode D1 are commonly connected to the anode of the light emitting diode of the second optocoupler U2, and the anode of the first diode D1 and the cathode of the light emitting diode of the second optocoupler U2 are the other input end of the zero-crossing detection module 13;

the collector of the triode of the second optocoupler U2 and one end of the seventh resistor R7 are connected to the output end of the zero-cross detection module 13, the emitter of the triode of the second optocoupler U2 is grounded, and the other end of the seventh resistor R7 is connected to the positive electrode of the direct-current power supply.

The working principle of the circuit is as follows: the ac power voltage is dropped by the sixth resistor R6 and then input to the led of the second optocoupler U2, a half-wave signal is obtained through half-wave rectification, the isolated zero-crossing signal is output from the second optocoupler U2, and the specific waveform is shown in fig. 9, the MCU12 outputs a PWM pulse signal to the led anode of the first optocoupler U1 at a predetermined time interval corresponding to the rising edge time point of the zero-crossing signal to make it turn on and emit light, if the full power of the liquid heating container is 1000W and the power set by the user is only 400W, and then the bidirectional diode of the first optocoupler U1 is turned on, the ac power L line supplies power to the control electrode G of the first bidirectional thyristor SCR1 through the second resistor R2 and the bidirectional diode HR, and the ac current can be turned on through the second anode a2 a SCR1, the second bidirectional thyristor HR, and the second anode a2 a of the first bidirectional thyristor 1, The first anode a1 forms a passage so that the heat generating tube HR operates to heat the liquid inside the liquid heating container. Since the PWM trigger pulse signal is narrow, the first triac SCR1 is automatically turned off at the zero-crossing point at the end of the first half cycle of the ac voltage, and is not turned on because there is no PWM trigger pulse voltage in the second half cycle of the ac voltage. The formed heating tube HR, i.e., the voltage applied to the heating plate 4, has a waveform as shown in fig. 9.

When the circuit works, the PWM pulse is narrow, the first triac SCR1 can only be conducted in the first half period of the ac voltage, so that the maximum power formed by supplying power to the heating tube HR is only half of the full power of the heating tube HR, and in order to obtain larger power supply, the PWM pulse can be widened, so that the falling edge time point of the PWM pulse is after the middle zero-crossing point time of the ac voltage, specifically as shown in fig. 10, the falling edge time point of the PWM pulse is after the C2 time in the figure, and at this time, the first triac SCR1 can still be conducted after the zero-crossing point, so that the whole second half period is conducted, and a larger power value is provided for the heating tube HR.

In order to flexibly control the conduction angle of the first bidirectional thyristor SCR1 in each half cycle of the ac voltage, the circuit of the zero-crossing detection module 13 may be modified to output a zero-crossing signal in each half cycle of the ac voltage, so that the MCU12 may output a PWM signal according to the zero-crossing signal to control the conduction angle of the thyristor in each half cycle, thereby flexibly changing the power supplied to the heat generating tube HR.

Further, based on the fourth embodiment of the heating control device for a liquid heating container of the present invention, in the fifth embodiment of the heating control device for a liquid heating container of the present invention, as shown in fig. 8, the device further includes a second switch module 14:

two ends of the switch of the second switch module 14 are connected in parallel with two ends of the switch of the first switch module 15, and the control end of the second switch module 14 is connected with the controller 12.

The controller 12 obtains the heating power of the current liquid heating container, and controls the second switch module 14 to be switched on and controls the first switch module to be switched off when the heating power is greater than the preset power threshold value, so as to control the heating plate to work.

Specifically, the second switch module 14 includes a first relay RY1 and a first NPN transistor Q1;

two ends of a switch of a coil of the first relay RY1 are two ends of a switch of the second switch module 14, one end of the coil of the first relay RY1 is connected with a direct-current power supply, the other end of the coil of the first relay RY1 is connected with a collector of a first NPN-type triode Q1, an emitter of the first NPN-type triode Q1 is grounded, and a base of the first NPN-type triode Q1 is a control end of the second switch module 14.

When the MCU12 outputs a high level, the first NPN transistor Q1 may be controlled to conduct to drive the coil of the first relay RY1, so that the switch is closed.

The circuit can further comprise a second diode D2 which is connected in parallel at two ends of a coil of the first relay RY1 in direction, and plays a role in discharging induced electromotive force generated on the coil when the relay is disconnected, so that the first NPN type triode Q1 is prevented from being damaged due to overhigh voltage, and the circuit can also comprise a fifth resistor R5 which is connected to the base of the first NPN type triode Q1 and the ground, so that the triode can be reliably cut off when the MCU12 has no control signal output.

Because the first bidirectional thyristor SCR1 is a current type device, it is easy to generate heat when the passing current is limited and the current is large, after pairing with the thyristor device with the current power being suitable according to the rule of device type selection, when the heating tube HR is in the full power working condition, the passing current of the thyristor is the largest, if the power of the type selection is relatively small, the heating is serious and even damaged when working for a long time. In order to prevent the phenomenon, a switch operated by the relay RY1 is added, and because the relay RY1 is a mechanical switch type working principle, the heat generation is much smaller during the operation, when the controller 12 acquires that the working power of the liquid heating container set by a user is very large and exceeds a preset power threshold value, a control signal is output to conduct the relay RY1, and the first bidirectional silicon controlled rectifier SCR1 is closed, so that the heat generation can be greatly reduced, and the working reliability of the whole circuit is improved. If the full power of the liquid heating container is 1000W, the preset power threshold value can be set to be larger than 800W, and the relay RY1 is started to control the work of the heating tube HR after the preset power threshold value is exceeded.

The invention also provides a liquid heating container, which comprises the above heating control device, the liquid heating container is further preferably a health preserving kettle, the structure diagram of which is shown in fig. 1, the anti-overflow module 9 is installed in the handle 11 of the health preserving kettle, the capacitance sensing piece 10 of the anti-overflow module is installed on the outer side wall of the kettle body 1 close to the handle 11, the capacitance sensing piece 10 internally comprises two independent capacitance sensing pieces, namely a first capacitance sensing piece 101 and a second capacitance sensing piece 102, the structure diagram of which is shown in fig. 2, the first capacitance sensing piece 101 and the second capacitance sensing piece 102 can be arranged in a left-right mode or an up-down mode, preferably in a left-right mode, and the distance between the first capacitance sensing piece 101 and the second capacitance sensing piece 102 is preferably 1-15 mm. The first capacitance sensing piece 101 and the second capacitance sensing piece 102 are respectively connected with the anti-overflow module 9 through wires to detect the sensed capacitance, and are transmitted to a controller 12 (not shown in fig. 1) arranged on the base through the coupler 3 arranged on the base 6, a temperature sensor 8 is arranged at the bottom of the kettle body 1 and is used for detecting the temperature of liquid such as water in the kettle body 1, the temperature sensor 8 is connected with the anti-overflow module 9 through wires to enable the anti-overflow module 9 to acquire the temperature signal, and the capacitance and the temperature signal are transmitted to the controller 12 through one bit in the coupler 3 based on a serial port communication mode, and the control right 12 controls the operation of the heating plate 4 according to the two signals so as to heat the health preserving kettle, heat the water in the health preserving kettle or cook food in the health preserving kettle.

Specifically, the capacitance sensing piece 10 is in a sheet shape, and can be in a square shape or other shapes as shown in the figure, the capacitance sensing piece 10 and the outer side wall of the health preserving kettle can be fixedly connected through glue or double faced adhesive tape, and the air gap between the capacitance sensing piece 10 and the outer side wall of the health preserving kettle is controlled within 3mm, so that accurate detection of two capacitances sensed by the capacitance sensing piece 10 is realized. In fig. 1, the capacitance sensing piece 10 is connected with the anti-overflow module 9 through a wire, and in another aspect, the capacitance sensing piece and the anti-overflow module 9 may also be integrated, that is, the anti-overflow module 9 is integrated in the capacitance sensing piece 10 and fixedly arranged on the outer side wall of the health preserving kettle, so that the installation of the separate anti-overflow module 9 can be omitted.

The schematic diagram of the line layout of the coupler 3 is shown in fig. 11, and its 5-bit signal lines include a strong-current signal line neutral (N)32, a strong-current signal line live (L)33, a weak-current signal line Ground (GND)31, a direct-current power supply positive (VCC) line 34, and a serial port communication line (UART)35, and the order of the lines may be other orders. In the figure, the anti-overflow module 9 sends the capacitance and temperature signals to the control right 12 through a serial port communication line (UART)35, so that two signals are sent by using a universal 5-bit coupler, and the universality of the coupler is realized, otherwise, a 6-bit coupler needs to be added, which is not beneficial to the generalization of the coupler, and thus, the cost is increased.

Through this heating control device, can effectual realization anti-overflow detect to prevented that liquid heating container from appearing overflowing the phenomenon when heating, and be used for the electric capacity response piece that the anti-overflow detected to install on the lateral wall of the liquid heating container who is close to the handle, the anti-overflow probe that has relatively installs inside liquid heating container, installation when making of electric capacity response piece can be made things convenient for, and hide the whole that also increases the product on liquid heating container's lateral wall pleasing to the eye. Moreover, the liquid heating container can realize adjustable heating power, can realize different power control when food materials are cooked or water is boiled, provides different heating power selections for users, and improves user experience.

Embodiments of the present invention also provide a computer program product comprising program instructions which, when executed by a controller, enable the controller to implement the heating control method for a liquid heating vessel as described in any of the above embodiments.

Embodiments of the present invention also provide a storage medium having computer readable instructions stored thereon, which when executed by a controller, enable the controller to perform the heating control method for a liquid heating vessel in the above embodiments.

Those skilled in the art can understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program to instruct related hardware, where the program is stored in a storage medium and includes several instructions to enable a (may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

In the description herein, references to the description of the terms "first embodiment," "second embodiment," "example," etc., mean that a particular method, apparatus, or feature described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, methods, apparatuses, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A heating control method for a liquid heating container, wherein a first capacitance sensing piece and a second capacitance sensing piece are mounted on the outer side wall of the liquid heating container, and the heating control method comprises the following steps:

acquiring a first capacitance value sensed by the first capacitance sensing piece and a second capacitance value sensed by the second capacitance sensing piece when the liquid heating container is heated;

judging whether the liquid temperature in the liquid heating container is higher than a preset temperature or not;

under the condition that the liquid temperature is judged to be higher than the preset temperature, whether the first capacitance and the second capacitance are higher than a first preset threshold value or not is respectively judged;

under the condition that the first capacitance and the second capacitance are both judged to be larger than the first preset threshold value, calculating the difference value between the first capacitance and the second capacitance;

stopping heating the liquid heating container under the condition that the difference value is smaller than a second preset threshold value;

wherein the first preset threshold is determined according to the liquid material inside the heating container.

2. The heating control method according to claim 1, further comprising:

after stopping heating the liquid heating container, under the condition that the first electric capacity and the second electric capacity are both reduced to be smaller than the first preset threshold value, starting heating the liquid heating container.

3. The heating control method according to claim 1, further comprising:

before judging whether the first capacitance and the second capacitance are larger than a first preset threshold value respectively, determining a corresponding first preset threshold value according to a set heating mode of the liquid heating container.

4. A heating control device for a liquid heating vessel, said heating control device comprising:

the liquid heating device comprises a first capacitance sensing piece and a second capacitance sensing piece, wherein the first capacitance sensing piece and the second capacitance sensing piece are respectively arranged on the outer side wall of the liquid heating container;

the heating plate is used for heating the liquid heating container;

a controller configured to:

controlling the heating plate to work so as to heat the liquid heating container;

acquiring the temperature detected by a temperature sensor;

under the condition that the difference value is smaller than a second preset threshold value, controlling the heating plate to stop working so as to stop heating the liquid heating container;

5. The heating control device of claim 4, further comprising an overfill prevention module,

6. The heating control device of claim 4, wherein the controller is further configured to:

and under the condition that the first capacitance and the second capacitance are both reduced to be smaller than the first preset threshold value, controlling the heating plate to work so as to heat the liquid heating container.

7. The heating control device of claim 4, wherein the controller is further configured to:

8. A storage medium having computer readable instructions stored thereon, wherein the computer readable instructions, when executed by a processor, cause the processor to perform a heating control method for a liquid heating vessel according to any one of claims 1 to 3.

9. A liquid heating vessel comprising a heating control means as claimed in any one of claims 4 to 7.