CN112857520A - Water level detection method and device - Google Patents

Water level detection method and device Download PDF

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Publication number
CN112857520A
CN112857520A CN201911190392.1A CN201911190392A CN112857520A CN 112857520 A CN112857520 A CN 112857520A CN 201911190392 A CN201911190392 A CN 201911190392A CN 112857520 A CN112857520 A CN 112857520A
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China
Prior art keywords
water level
capacitors
capacitance
induction
sensing
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CN201911190392.1A
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Chinese (zh)
Inventor
黄伟群
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Midea Group Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
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Midea Group Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
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Priority to CN201911190392.1A priority Critical patent/CN112857520A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00—Baking; Roasting; Grilling; Frying
    • A47J37/06—Roasters; Grills; Sandwich grills
    • A47J37/0623—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity
    • A47J37/0664—Accessories
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/268—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J2203/00—Devices having filling level indicating means

Abstract

The embodiment of the application provides a water level detection method and device. The water level detection method comprises the following steps: the water level detection device comprises a water tank side wall, a plurality of induction capacitors are longitudinally distributed on the water tank side wall in an intersecting manner to obtain capacitance values of the induction capacitors, if the capacitance values of at least two induction capacitors in the induction capacitors are in a change state, positions corresponding to the capacitance values of the at least two induction capacitors are fitted into a horizontal line, and the water level corresponding to the horizontal line is determined according to the capacitance values of the at least two induction capacitors and an overlapping area between induction areas corresponding to the at least two induction capacitors. The technical scheme of this application embodiment determines the water level based on the overlap region between the induction area that at least two induction capacitors correspond, has avoided because the blind area of water level detection that the clearance between the induction capacitor leads to has improved the accuracy nature of water level detection, has guaranteed cooking utensil reliability and security of work.

Description

Water level detection method and device
Technical Field
The application relates to the technical field of computers and communication, in particular to a water level detection method and device.
Background
The steam oven and the steaming and baking integrated machine are favored by many people because the prepared food is nutritional and healthy, and in the baking process, water vapor is released, so that the barbecue flavor can be made, and excessive loss of moisture and nutrition can be avoided. A general steaming and baking integrated machine is provided with a discrete water box, and during cooking, the cooking experience is influenced by water shortage. The water level is generally determined by a capacitance sensing method, and a capacitor with too small area cannot sense the height of the water level, so that a blind area of water level detection is caused, and the water level detection is inaccurate.
Disclosure of Invention
The embodiment of the application provides a water level detection method and device, so that a blind area of water level detection in a cooking appliance can be avoided at least to a certain extent, and the accuracy of the water level detection is improved.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.
According to an aspect of an embodiment of the present application, there is provided a water level detecting apparatus applied to a cooking appliance, including: a water tank; the inductive capacitors are longitudinally arranged on the side wall of the water tank in a crossed mode, and an overlapping area exists between inductive areas corresponding to adjacent inductive capacitors in the longitudinal arrangement direction.
According to an aspect of an embodiment of the present application, there is provided a water level detecting method including: obtaining capacitance values of the plurality of induction capacitors; if the capacitance values of at least two of the plurality of induction capacitors are in a change state, fitting the positions corresponding to the capacitance values of the at least two induction capacitors into a horizontal line; and determining the water level corresponding to the horizontal line according to the capacitance values of the at least two induction capacitors and the overlapping area between the induction areas corresponding to the at least two induction capacitors.
According to an aspect of an embodiment of the present application, there is provided a water level detecting apparatus including: an obtaining unit, configured to obtain capacitance values of the plurality of sensing capacitors; the fitting unit is used for fitting positions corresponding to the capacitance values of at least two induction capacitors into a horizontal line if the capacitance values of at least two induction capacitors in the plurality of induction capacitors are in a change state; and the determining unit is used for determining the water level corresponding to the horizontal line according to the capacitance values of the at least two induction capacitors and the overlapping area between the induction areas corresponding to the at least two induction capacitors.
In some embodiments of the present application, based on the foregoing scheme, the determining unit includes: a first determining unit, configured to determine a water level corresponding to the horizontal line according to a capacitance value of the capacitance values of the at least two sensing capacitors, an increment of a sensing distance corresponding to a unit capacitor, and a position of the overlapping area.
In some embodiments of the present application, based on the foregoing scheme, the determining unit includes: and the second determining unit is used for determining the water level corresponding to the horizontal line according to one of the capacitance values of the at least two sensing capacitors, the capacitance increment corresponding to the unit sensing distance and the position of the overlapping area.
In some embodiments of the present application, based on the foregoing scheme, the second determining unit includes: a third determination unit that determines the position increment based on a quotient between the capacitance value and the capacitance increment; a fourth determination unit that determines the water level based on a vector sum between the position increment and the position of the overlap region.
In some embodiments of the present application, based on the foregoing solution, the water level detecting device further includes: the first calculation unit is used for calculating the distance difference between two sample water level values and the capacitance difference between sample capacitance values corresponding to the sample water level values; a second calculation unit for determining the capacitance increment based on a quotient between the capacitance difference and the distance difference.
In some embodiments of the present application, based on the foregoing solution, the water level detecting device further includes: and the identification unit is used for identifying the position corresponding to the capacitance value in the change state as the water level if the capacitance value of one of the plurality of induction capacitors is in the change state.
In some embodiments of the present application, based on the foregoing solution, the identification unit is configured to: if the capacitance value of one of the plurality of sensing capacitors is in a change state and the capacitance value in the change state is greater than a preset capacitance threshold value, identifying a position corresponding to the capacitance value in the change state as the water level.
According to an aspect of embodiments of the present application, there is provided a computer-readable medium having stored thereon a computer program which, when executed by a processor, implements the water level detection method as described in the above embodiments.
According to an aspect of an embodiment of the present application, there is provided an electronic device including: one or more processors; a storage device for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement the water level detection method as described in the above embodiments.
In the technical scheme provided by some embodiments of the present application, a plurality of sensing capacitors are longitudinally arranged on a water tank side wall of a water level detection device in an intersecting manner to obtain capacitance values of the plurality of sensing capacitors, if the capacitance values of at least two sensing capacitors in the plurality of sensing capacitors are in a changing state, positions corresponding to the capacitance values of the at least two sensing capacitors are fitted to a horizontal line, and a water level corresponding to the horizontal line is determined according to the capacitance values of the at least two sensing capacitors and an overlapping area between sensing areas corresponding to the at least two sensing capacitors. The technical scheme of this application embodiment determines the water level based on the overlap region between the induction area that at least two induction capacitors correspond, has avoided because the blind area of water level detection that the clearance between the induction capacitor leads to has improved the accuracy nature of water level detection, has guaranteed cooking utensil reliability and security of work.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 schematically shows a schematic view of a cooking appliance according to an embodiment of the present application;
FIG. 2 schematically illustrates a schematic diagram of an inductive capacitance arrangement according to an embodiment of the present application;
FIG. 3 schematically illustrates a schematic diagram of an overlap region between sense capacitances according to an embodiment of the present application;
FIG. 4 schematically shows a flow chart of a water level detection method according to an embodiment of the present application;
FIG. 5 schematically shows a schematic diagram of water level determination according to an embodiment of the present application;
FIG. 6 schematically illustrates a flow chart for calculating a capacitance delta according to an embodiment of the present application;
FIG. 7 schematically illustrates a flow chart for determining water level according to an embodiment of the present application;
fig. 8 schematically shows a block diagram of a water level detection apparatus according to an embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
Compared with a microwave oven, people in China may prefer a steam oven, a steaming and baking all-in-one machine and the like because of nutrition and health. In the baking process, water vapor is released, so that the baked flavor can be made, and excessive loss of water and nutrition cannot be caused. However, a common desktop type steaming and baking integrated machine is provided with a separated water box, and during cooking, the cooking experience is affected by water shortage.
Fig. 1 shows a schematic view of a cooking appliance according to an embodiment of the present application, wherein the cooking appliance 100 comprises: a water tank, which may be a transparent case 110, for storing water to heat food by heating water to steam generated after boiling; an air gap 120 exists between the water tank 110 and the housing of the cooking appliance; a capacitive sensing Printed Circuit Board (PCB) 130 mounted on the side wall of the tank.
As shown in fig. 2, fig. 2 is a schematic diagram of an arrangement of sensing capacitors according to an embodiment of the present disclosure. A plurality of induction capacitors for detecting water level are installed on the PCB 130, the induction capacitors are longitudinally arranged on the side wall of the water tank in a crossed mode, each induction capacitor corresponds to different induction areas, and an overlapping area exists between the induction areas corresponding to the adjacent induction capacitors in the longitudinal direction.
Illustratively, in FIG. 2, including the sensing regions 1-7, i.e. 1301-1307, there is an overlapping region between the sensing regions corresponding to adjacent sensing capacitors in the longitudinal direction. For example, the lower portion of the sensing region 3(1303) and the upper portion of the sensing region 4(1304) can be used for detecting the water level at the same height, and the overlapping region between the two regions is an overlapping region or a fuzzy region.
In one embodiment of the present application, the plurality of sensing capacitors includes: the inductive capacitors in each row are longitudinally arranged at intervals, and the inductive capacitors in adjacent rows have overlapped inductive areas.
In an embodiment of the present application, as shown in fig. 3, fig. 3 includes sensing regions 1 to 7, an overlapping region exists between the sensing region 4(1304) and the sensing region 5(1305), the overlapping region corresponds to the region 301 in the sensing region 4(1304), and corresponds to the region 302 in the sensing region 5(1305), when the water level 303 is located in the fuzzy region, the water level 403 generates a corresponding capacitance value in the region 301, the water level 303 also generates a corresponding capacitance value in the region 302, and in this embodiment, the position corresponding to the water level 303 is obtained by integrating the two capacitance values.
It should be noted that the sensing area in this embodiment may be more than two sensing areas arranged in the transverse direction, and the number of the rows of the sensing areas is not limited herein.
Fig. 4 illustrates a flowchart of a water level detection method according to an embodiment of the present application, which is applied to a cooking appliance in which a water level detection apparatus is installed, for example, to perform the water level detection method of the present embodiment. Referring to fig. 4, the water level detection method at least includes steps S410 to S430, which are described in detail as follows:
in step S410, capacitance values of a plurality of sensing capacitors are obtained.
In an embodiment of the application, a plurality of induction capacitors are installed in the water level detection device and used for detecting water levels, the induction capacitors are longitudinally arranged on the side wall of the water tank in a crossed mode, each induction capacitor corresponds to different induction areas, and an overlapping area exists between the induction areas corresponding to the adjacent induction capacitors in the longitudinal direction.
In an embodiment of the present application, when the water level has fallen below the sensing capacitor, the sensing capacitor will generate a corresponding capacitance value, and therefore, the capacitance values of the sensing capacitors obtained in this embodiment are the capacitance values generated by all the sensing capacitors that have fallen below the water level.
For example, as shown in fig. 2, if the current water level is in the sensing area 5(1305), and the sensing areas 6(1306), 7(1307) are submerged in water, the capacitance values obtained in this embodiment include: the capacitance values generated by the sensing regions 5(1305), 6(1306) and 7 (1307).
In addition, if the current water level only contacts or does not pass through one induction capacitor, only the capacitance value of the induction capacitor is obtained, and the current water level is determined according to the capacitance value of the induction capacitor.
In an embodiment of the present application, after the process of obtaining the capacitance values of the plurality of sensing capacitors in step S410, step S4101 is included: and if the capacitance value of one of the plurality of induction capacitors is in a change state, identifying the position corresponding to the capacitance value in the change state as the water level.
In an embodiment of the present application, as above, after the obtained capacitance values corresponding to the multiple sensing capacitors, only one capacitance value of the sensing capacitors is in a change state, which indicates that the water level fluctuates continuously along with boiling of boiling water, and the sensing capacitor at the top of the water level changes its corresponding capacitance value along with fluctuation of the water level, so that it can be indicated that the current water level is in a single area between the sensing capacitors, that is, the current water level can be determined through the current capacitance value.
Specifically, before confirming current water level, can confirm the capacitance difference in the unit water level distance according to sample capacitance value and its water level value that corresponds in this embodiment, perhaps confirm the water level difference that unit capacitance value changes and corresponds, later, according to current capacitance value and capacitance difference, alright in order to confirm the water level that current capacitance value corresponds. Or, according to the current capacitance value or the water level difference value, the water level corresponding to the current capacitance value can be determined, and the method is not limited here.
Furthermore, because the capacitance change of the sensing capacitor is large, and the influence of boiling water on the change of the capacitance value in the boiling process is large, a capacitance threshold is predetermined in this embodiment and is used for measuring the size of the acquired capacitance value through the capacitance threshold, and when the capacitance value of one of the sensing capacitors is in a change state and the capacitance value in the change state is greater than or equal to the preset capacitance threshold, the position corresponding to the capacitance value in the change state is identified as the water level.
In addition, when the capacitance value of one of the plurality of sensing capacitors is in a changing state and the capacitance value in the changing state is smaller than the capacitance threshold value, whether the current capacitance value meets the condition is obtained again and detected until the capacitance value of one of the plurality of sensing capacitors is in the changing state and the capacitance value in the changing state is larger than or equal to the preset capacitance threshold value, and the position corresponding to the capacitance value in the changing state is identified as the water level.
It should be noted that, due to the difference in the installation process of the cooking appliances, each sensing area can read certain data, and when a certain threshold is exceeded, the area is considered to be completely valid.
In step S420, if the capacitance values of at least two of the plurality of sensing capacitors are in a changing state, the positions corresponding to the capacitance values of the at least two sensing capacitors are fitted to form a horizontal line.
In an embodiment of the present application, if there is at least two of the plurality of sensing capacitors whose capacitance values are in a changing state, it indicates that there are at least two sensing capacitors where the water level is in contact, that is, the water level is in an additional overlapping area between the sensing capacitors, in this case, positions corresponding to the capacitance values of the at least two sensing capacitors are fitted to a horizontal line, so as to determine the position of the water level according to the horizontal line.
In an embodiment of the present application, because boiling water boils and leads to the surface of water undulant, this kind of condition makes the unable one-to-one correspondence of capacitance value of at least two induction capacitors, therefore, can be through the mode of asking the mean value between the capacitance value that each induction capacitor corresponds in this embodiment, or through adjusting these capacitance values each other according to the capacitance value of at least two induction capacitors to make all capacitance values all correspond same water level.
In step S430, a water level corresponding to the horizontal line is determined according to the capacitance values of the at least two sensing capacitors and the overlapping area between the sensing areas corresponding to the at least two sensing capacitors.
In an embodiment of the present application, when capacitance values of at least two sensing capacitors are changed, it indicates that an overlapping area exists between sensing areas corresponding to the at least two sensing capacitors, and therefore, in this embodiment, a water level distance is determined according to the capacitance values corresponding to the two sensing capacitors, and then a water level corresponding to a horizontal line is determined according to a position of the overlapping area between the sensing areas corresponding to the two sensing capacitors.
In an embodiment of the present application, the step S430 of determining the water level corresponding to the horizontal line according to the capacitance values of the at least two sensing capacitors and the overlapping area between the sensing areas corresponding to the at least two sensing capacitors includes the step S4301: and determining the water level corresponding to the horizontal line according to one of the capacitance values of the at least two induction capacitors, the induction distance increment corresponding to the unit capacitor and the position of the overlapping area.
Referring to fig. 5, fig. 5 is a schematic diagram of water level determination provided in the embodiment of the present application. The sensor comprises a sensing capacitor 1304, a sensing capacitor 1305, overlapping areas 502 and 503 between the two capacitors, a current water level 501 and the height X of the corresponding overlapping area of the sensing capacitor 13041、X2，X3A certain height in the sense capacitance 1304; the sensing capacitor 1305 has an overlapping region with a height Y1、Y2，Y3Is sensing a certain height in the capacitor 1305.
In one embodiment of the present application, sample data of a capacitance value and a corresponding water level height thereof is obtained in advance. Calculating a distance difference X between two sample water level values3-X2ADC (analog to digital converter) for capacitance difference between sample capacitance values corresponding to sample water level values3-ADC2Wherein, ADC2、ADC3Respectively represent X2、X3Corresponding to the measured capacitance value; the distance increment is determined from the quotient between the capacitance difference and the distance difference as:
Figure BDA0002293413730000081
determining the water level value as X according to the capacitance increment and the currently measured capacitance value2ADC/Δ x, where ADC is used to represent the currently measured capacitance value.
In an embodiment of the present application, the step S430 of determining the water level corresponding to the horizontal line according to the capacitance values of the at least two sensing capacitors and the overlapping area between the sensing areas corresponding to the at least two sensing capacitors includes the step S4302: and determining the water level corresponding to the horizontal line according to one of the capacitance values of the at least two induction capacitors, the capacitance increment corresponding to the unit induction distance and the position of the overlapping area.
In an embodiment of the present application, corresponding to the step S4301, a water level corresponding to the horizontal line is determined by calculating a capacitance increment corresponding to the unit sensing distance and according to the position of the overlapping region.
It should be noted that, in this embodiment, step S4301 and step S4302 are executed in parallel, and there is no obvious priority or priority level.
In an embodiment of the present application, as shown in fig. 6, before the process of determining the water level corresponding to the horizontal line according to one of the capacitance values of the at least two sensing capacitors, the capacitance increment corresponding to the unit sensing distance, and the position of the overlapping region in step S4302, the following steps S610 to S620 are included, which are described in detail as follows:
in step S610, a distance difference between two sample water level values and a capacitance difference between sample capacitance values corresponding to the sample water level values are calculated.
In one embodiment of the present application, the capacitance value and is obtained in advanceThe corresponding sample data of the water level height. Calculating a distance difference X between two sample water level values3-X2ADC (analog to digital converter) for capacitance difference between sample capacitance values corresponding to sample water level values3-ADC2Wherein, ADC2、ADC3Respectively represent X2、X3Corresponding to the measured capacitance value.
In step S620, the capacitance increment is determined according to the quotient between the capacitance difference and the distance difference.
In one embodiment of the present application, after calculating the distance difference between two sample water level values and the capacitance difference between the sample capacitance values corresponding to the sample water level values, the capacitance increment is determined according to the quotient between the capacitance difference and the distance difference as follows:
Figure BDA0002293413730000091
in an embodiment of the present application, as shown in fig. 7, the process of determining the water level corresponding to the horizontal line according to one of the capacitance values of the at least two sensing capacitors, the capacitance increment corresponding to the unit sensing distance, and the position of the overlapping region in step S4302 includes the following steps S710 to S720, which are described in detail as follows:
in step S710, a position increment is determined according to a quotient between a capacitance value and the capacitance increment.
In one embodiment of the present application, after determining the capacitance increment based on the quotient between the capacitance difference and the distance difference, the position increment is determined as ADC/Δ ADC based on the capacitance increment and the currently measured capacitance value, where ADC is used to represent the currently measured capacitance value.
In step S720, the water level is determined from the vector sum between the position increment and the position of the overlap region.
In one embodiment of the present application, after determining the position increment based on a quotient between a capacitance value and the capacitance increment, determining the water level value based on the capacitance increment and the currently measured capacitance value as:
X2-ADC/ΔADC
it should be noted that, in an embodiment of the present application, the sample data processing manner and the water level determination manner are calculated and determined based on the value of X corresponding to the sensing capacitor 1304, except that in the embodiment, the distance increment or the position increment may be determined based on the sample data of the sensing capacitor 1305 in the same manner, so as to determine the water level according to the distance increment or the position increment and the value of Y corresponding to the sensing capacitor 1305.
Further, the water level value obtained from an inductive capacitor may not be accurate enough to take into account the water level fluctuation during boiling. Therefore, the water level corresponding to the first sensing capacitor can be determined, the water level corresponding to the second sensing capacitor can be determined simultaneously, and the mean value of the two water level values is calculated finally to obtain the final water level. For example, the water level corresponding to the sensing capacitor 1304 is determined, the water level corresponding to the sensing capacitor 1305 is determined at the same time, and finally, the average value of the two water level values is calculated to obtain the final water level.
In one embodiment of the present application, the amount of water in the water box is detected by a capacitive detection scheme; the embodiment is a non-contact scheme, is clean and sanitary, and has no pollution to water; in the embodiment, the water level analog quantity is obtained approximately by rearranging the PCB sampled by the capacitor and adding a software algorithm, and the finally obtained numerical value is the specific digit height instead of only a few gears, so that the accuracy of water level detection is improved, and the working reliability and safety of the cooking utensil are improved.
Embodiments of the apparatus of the present application are described below, which may be used to perform the water level detection method in the above-described embodiments of the present application. For details that are not disclosed in the embodiments of the apparatus of the present application, please refer to the embodiments of the water level detection method described above in the present application.
Fig. 8 shows a block diagram of a water level detection apparatus according to an embodiment of the present application.
Referring to fig. 8, a water level detecting apparatus 800 according to an embodiment of the present application includes:
an obtaining unit 810, configured to obtain capacitance values of a plurality of sensing capacitors;
a fitting unit 820, configured to fit, if capacitance values of at least two of the plurality of sensing capacitors are in a changing state, positions corresponding to the capacitance values of the at least two sensing capacitors to a horizontal line;
the determining unit 830 is configured to determine a water level corresponding to the horizontal line according to the capacitance values of the at least two sensing capacitors and an overlapping area between the sensing areas corresponding to the at least two sensing capacitors.
In some embodiments of the present application, based on the foregoing scheme, the determining unit 830 includes: the first determining unit is used for determining the water level corresponding to the horizontal line according to one of the capacitance values of the at least two sensing capacitors, the sensing distance increment corresponding to the unit capacitor and the position of the overlapping area.
In some embodiments of the present application, based on the foregoing scheme, the determining unit 830 includes: and the second determining unit is used for determining the water level corresponding to the horizontal line according to one of the capacitance values of the at least two sensing capacitors, the capacitance increment corresponding to the unit sensing distance and the position of the overlapping area.
In some embodiments of the present application, based on the foregoing scheme, the second determination unit includes: a third determination unit that determines a position increment based on a quotient between a capacitance value and the capacitance increment; and a fourth determination unit determining the water level according to a vector sum between the position increment and the position of the overlap region.
In some embodiments of the present application, based on the foregoing solution, the water level detecting apparatus 800 further includes: the first calculation unit is used for calculating the distance difference between the two sample water level values and the capacitance difference between the sample capacitance values corresponding to the sample water level values; a second calculation unit for determining the capacitance increment based on a quotient between the capacitance difference and the distance difference.
In some embodiments of the present application, based on the foregoing solution, the water level detecting apparatus 800 further includes: and the identification unit is used for identifying the position corresponding to the capacitance value in the change state as the water level if the capacitance value of one of the plurality of induction capacitors is in the change state.
In some embodiments of the present application, based on the foregoing solution, the identification unit is configured to: if the capacitance value of one of the plurality of sensing capacitors is in a change state and the capacitance value in the change state is greater than a preset capacitance threshold value, identifying a position corresponding to the capacitance value in the change state as a water level.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the application. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of the present application.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. A water level detecting apparatus applied to a cooking appliance, comprising:
a water tank;
the inductive capacitors are longitudinally arranged on the side wall of the water tank in a crossed mode, and an overlapping area exists between inductive areas corresponding to adjacent inductive capacitors in the longitudinal arrangement direction.
2. The water level detecting apparatus according to claim 1, wherein the plurality of sensing capacitors comprise:
the inductive capacitors are arranged in the rows at intervals longitudinally, and the inductive capacitors in the adjacent rows have overlapped inductive areas.
3. A water level detection method applied to a cooking appliance including the water level detection apparatus of claim 1 or 2, the water level detection method comprising:
obtaining capacitance values of the plurality of induction capacitors;
if the capacitance values of at least two of the plurality of induction capacitors are in a change state, fitting the positions corresponding to the capacitance values of the at least two induction capacitors into a horizontal line;
and determining the water level corresponding to the horizontal line according to the capacitance values of the at least two induction capacitors and the overlapping area between the induction areas corresponding to the at least two induction capacitors.
4. The method of claim 3, wherein determining the water level corresponding to the horizontal line according to the capacitance values of the at least two sensing capacitors and the overlapping area between the sensing areas corresponding to the at least two sensing capacitors comprises:
and determining the water level corresponding to the horizontal line according to one of the capacitance values of the at least two induction capacitors, the induction distance increment corresponding to the unit capacitor and the position of the overlapping area.
5. The method of claim 3, wherein determining the water level corresponding to the horizontal line according to the capacitance values of the at least two sensing capacitors and the overlapping area between the sensing areas corresponding to the at least two sensing capacitors comprises:
and determining the water level corresponding to the horizontal line according to one of the capacitance values of the at least two induction capacitors, the capacitance increment corresponding to the unit induction distance and the position of the overlapping area.
6. The method of claim 5, wherein determining the water level corresponding to the horizontal line according to a capacitance value of the at least two sensing capacitors, a capacitance increment corresponding to a unit sensing distance, and a position of the overlap region comprises:
determining the position increment according to a quotient between the capacitance value and the capacitance increment;
determining the water level from a vector sum between the position increment and the position of the overlap region.
7. The method of claim 5, wherein before determining the water level corresponding to the horizontal line according to a capacitance value of the at least two sensing capacitors, a capacitance increment corresponding to a unit sensing distance, and a position of the overlap region, further comprising:
calculating the distance difference between two sample water level values and the capacitance difference between sample capacitance values corresponding to the sample water level values;
determining the capacitance increment based on a quotient between the capacitance difference and the distance difference.
8. The method of claim 3, wherein after obtaining the capacitance values of the plurality of sensing capacitors, further comprising:
and if the capacitance value of one of the plurality of induction capacitors is in a change state, identifying the position corresponding to the capacitance value in the change state as the water level.
9. The method of claim 8, wherein identifying a location corresponding to a capacitance value in a changing state as the water level if the capacitance value of one of the plurality of sensing capacitors is in the changing state comprises:
if the capacitance value of one of the plurality of sensing capacitors is in a change state and the capacitance value in the change state is greater than a preset capacitance threshold value, identifying a position corresponding to the capacitance value in the change state as the water level.
10. A water level detection apparatus, comprising:
an obtaining unit, configured to obtain capacitance values of the plurality of sensing capacitors;
the fitting unit is used for fitting positions corresponding to the capacitance values of at least two induction capacitors into a horizontal line if the capacitance values of at least two induction capacitors in the plurality of induction capacitors are in a change state;
and the determining unit is used for determining the water level corresponding to the horizontal line according to the capacitance values of the at least two induction capacitors and the overlapping area between the induction areas corresponding to the at least two induction capacitors.
CN201911190392.1A 2019-11-28 2019-11-28 Water level detection method and device Pending CN112857520A (en)

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