CN109827703B - Air pressure detection method and device and washing machine - Google Patents
Air pressure detection method and device and washing machine Download PDFInfo
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- CN109827703B CN109827703B CN201910240683.0A CN201910240683A CN109827703B CN 109827703 B CN109827703 B CN 109827703B CN 201910240683 A CN201910240683 A CN 201910240683A CN 109827703 B CN109827703 B CN 109827703B
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Abstract
The invention discloses an air pressure detection device, which comprises: a housing provided with a first opening; the absolute pressure sensor is arranged in the shell; the fixing piece is arranged in the shell and provided with a cavity, the fixing piece is provided with a second opening and a third opening which are communicated with the cavity, and the third opening is communicated with the first opening; and the differential pressure sensor is arranged at the second opening so as to detect the differential pressure in the cavity and between the two parts in the shell. The invention also discloses an air pressure detection method and a washing machine. The pressure detection device can accurately measure the air pressure in the external environment.
Description
Technical Field
The invention relates to the technical field of air pressure detection, in particular to an air pressure detection method, an air pressure detection device and a washing machine.
Background
The gas pressure sensor is an instrument for measuring the absolute pressure of gas, is mainly suitable for physical experiments related to the gas pressure, such as gas law and the like, and can also be used for measuring the dry and non-corrosive gas pressure in biological and chemical experiments.
When the air pressure sensor detects the pressure in the environment, the air pressure sensor indicates that air pressure noise is generated due to the movement of people in the environment or the fluctuation of the air pressure in the environment caused by an air conditioning device (an air conditioning device, such as a fan or an air conditioner), so that the air pressure detected by the air pressure sensor is inaccurate.
Disclosure of Invention
The invention mainly aims to provide an air pressure detection method, an air pressure detection device and a washing machine, and aims to solve the problem that air pressure detected by an air pressure sensor is inaccurate.
In order to achieve the above object, the present invention provides an air pressure detecting device, including:
a housing provided with a first opening;
the absolute pressure sensor is arranged in the shell;
the fixing piece is arranged in the shell and provided with a cavity, the fixing piece is provided with a second opening and a third opening which are communicated with the cavity, and the third opening is communicated with the first opening;
and the differential pressure sensor is arranged at the second opening so as to detect the differential pressure in the cavity and between the two parts in the shell.
In one embodiment, the housing is provided with a fourth opening, and the housing is provided with a fourth opening to allow outside air to enter the housing.
In one embodiment, the air pressure detecting device further includes a processor, a memory, and an air pressure detecting program stored on the memory and executable on the processor, and the air pressure detecting program realizes the following steps when executed by the processor:
acquiring a first voltage value of a resistor in the absolute pressure sensor and a second voltage value of the resistor in the differential pressure sensor;
determining a first air pressure of the external environment according to the first voltage value, and determining a first air pressure difference between the inside of the shell and the inside of the cavity according to the second voltage value;
and determining a second air pressure in the cavity according to the first air pressure difference and the first air pressure, wherein the second air pressure is a target air pressure of the external environment.
To achieve the above object, the present invention also provides a washing machine including the air pressure detecting apparatus as claimed in the claims.
In one embodiment, the air pressure detecting device is disposed at a bottom of a drum of the washing machine, and the bottom of the drum is provided with an opening for communicating with outside air.
In order to achieve the above object, the present invention further provides an air pressure detecting method, including the steps of:
acquiring a first voltage value of a resistor in an absolute pressure sensor and a second voltage value of the resistor in a differential pressure sensor;
determining a first air pressure of the external environment according to the first voltage value, and determining a first air pressure difference between the inside of the shell and the inside of the cavity according to the second voltage value;
and determining a second air pressure in the cavity according to the first air pressure difference and the first air pressure, wherein the second air pressure is a target air pressure of the external environment.
In one embodiment, the step of determining a second air pressure within the cavity based on the first air pressure differential and the first air pressure comprises:
determining each first air pressure and a time period of each first air pressure difference;
determining a first air pressure curve according to the time period and each first air pressure, and determining a first pressure difference curve according to the time period and each first air pressure difference;
carrying out reverse phase processing on the first differential pressure curve to obtain a second differential pressure curve;
superposing the second pressure difference curve and the first air pressure curve to obtain a second air pressure curve corresponding to the cavity;
and determining a second air pressure corresponding to the cavity in the time period according to the second air pressure curve.
In an embodiment, the step of determining a second air pressure corresponding to the cavity in the time period according to the second air pressure curve includes:
calculating a second air pressure difference between second air pressures corresponding to adjacent time points on the second air pressure curve;
taking a second air pressure difference larger than a preset difference value as a target air pressure difference, and determining a target second air pressure corresponding to the target air pressure difference;
removing each target second air pressure from the second air pressure curve to obtain a corrected second air pressure curve;
and determining the corresponding second air pressure of the cavity in the time period according to the corrected second air pressure curve.
In an embodiment, the step of performing an inversion process on the first differential pressure curve to obtain the second differential pressure curve includes:
taking a time axis in a coordinate system where the first pressure difference curve is located as a target axis;
and carrying out symmetrical processing on the first differential pressure curve by taking the target axis as a symmetrical axis so as to obtain a second differential pressure curve symmetrical to the first differential pressure curve.
In an embodiment, the step of performing a superposition process on the second differential pressure curve and the first air pressure curve to obtain a second air pressure curve corresponding to the cavity includes:
determining each third air pressure difference in the second pressure difference curve, and determining a first air pressure corresponding to each third air pressure difference in the first air pressure curve, wherein the time point corresponding to the third air pressure difference is the same as the time point of the first air pressure corresponding to the third air pressure difference;
and superposing each third air pressure difference in the second pressure difference curve to the first air pressure corresponding to each third pressure difference so as to obtain a second air pressure curve corresponding to the cavity.
The invention provides an air pressure detection device, an air pressure detection method and a washing machine, wherein the air pressure detection device comprises a shell provided with a first opening, an absolute pressure sensor, a fixing piece and a pressure difference sensor, wherein the absolute pressure sensor, the fixing piece and the pressure difference sensor are arranged in the shell; because the air in the cavity is not influenced by external factors to generate fluctuation, the pressure detection device can accurately measure the air pressure in the external environment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of an air pressure detecting device according to the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of an air pressure detecting device according to the present invention;
FIG. 3 is a schematic flow chart illustrating an embodiment of an air pressure detecting device according to the present invention;
FIG. 4 is a schematic flow chart illustrating an exemplary embodiment of an air pressure detecting device according to the present invention;
FIG. 5 is a schematic diagram of a first pressure curve, a first pressure difference curve, and a second pressure difference curve according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
11 | |
| 12 | The fourth opening | 13 | |
| 14 | |
20 | |
| 30 | |
31 | |
| 32 | Third opening | 40 | Differential pressure sensor |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are 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.
The invention provides an air pressure detection device.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an air pressure detecting device of the present invention, the air pressure detecting device includes: a housing 10, the housing 10 being provided with a first opening 11; an absolute pressure sensor 20 provided in the housing 10; the fixing piece 30 is arranged in the shell 10 and provided with a cavity 31, the fixing piece 10 is provided with a second opening (not marked) and a third opening 32 which are communicated with the cavity 31, and the third opening 32 is communicated with the first opening 11; and a differential pressure sensor 40 disposed at the second opening to detect a differential pressure between the inside of the cavity 31 and the inside of the housing 10.
The differential pressure sensor 40 may cover the second opening such that air in the cavity does not flow into the housing, i.e., the differential pressure sensor is capable of detecting the air pressure difference between the housing and the cavity.
The fixing member 30 includes a wall surface, and the wall surface is surrounded by a hollow structure, i.e. a cavity 31. In order to reduce the fluctuation of the air pressure in the cavity 31 caused by the external factors, the lower portion of the cavity 31 may be formed in a funnel shape, that is, the cross-sectional area of the third opening 32 is smaller than that of the second opening.
Further, referring to fig. 2, the housing 10 is provided with a fourth opening 12, so that air in the external environment flows into the housing 10 through the fourth opening, so that the absolute pressure sensor 20 can detect air pressure in the external environment, if the air pressure fluctuation detected by the absolute pressure sensor 20 in a period of time is small, the air pressure can be a target air pressure corresponding to the external environment in the period of time, if the air pressure fluctuation is large, the air pressure detected by the absolute pressure sensor 20 needs to be combined with the air pressure difference detected by the differential pressure sensor 40 to obtain the air pressure in the cavity, and the air pressure in the cavity is used as the target air pressure of the external environment.
With continued reference to fig. 2, the housing 10 may include a cover 13 and a base 14, the cover 13 may be detachably connected to the base 14, for example, by a snap or a slot to facilitate maintenance of the absolute pressure sensor 20 and the differential pressure sensor 30, the cover 13 may be made of a metal material, and the base 14 may be made of a material with a smaller hardness to facilitate opening the first opening 11 on the base 13.
The air pressure detecting device is further provided with a memory (not shown), a processor (not shown) and an air pressure detecting program which is stored in the memory and can run on the processor. When the target air pressure of the external environment needs to be detected, the processor determines the resistance variation of the resistor by acquiring the voltage value of the resistor in the absolute pressure sensor, wherein the resistance variation is related to the absolute pressure of air in the shell acting on a pressure membrane in the absolute pressure sensor, at the moment, the processor can calculate the absolute pressure according to the resistance variation, and the absolute pressure is the first air pressure in the shell; in addition, the processor obtains the voltage value of the resistor in the absolute pressure sensor and obtains the voltage value of the resistor in the differential pressure sensor at the same time, the air pressure difference between the inside of the shell and the cavity is obtained according to the voltage value, at the moment, the target air pressure is obtained by subtracting the air pressure difference from the measured first air pressure, and the target air pressure is the target air pressure of the external environment. Because the air in the cavity is not influenced by external factors to generate fluctuation, the pressure detection device can accurately measure the air pressure in the external environment.
The invention also provides a washing machine, which comprises an air pressure detection device, wherein the air pressure detection device is arranged at the bottom of the rotary drum of the washing machine, the bottom of the rotary drum is provided with an opening, and air in the external environment can flow into the shell of the air pressure detection device through the opening, so that the air pressure detection device detects the target air pressure of the external environment. The washing machine calculates the water level in the drum by detecting the target air pressure of the external environment detected by the air pressure detection device and the liquid pressure detected by the absolute pressure sensor.
The invention also provides an air pressure detection method.
Referring to fig. 3, fig. 3 is a diagram illustrating an embodiment of an air pressure detecting method according to the present invention, the air pressure detecting method includes the following steps:
step S100, acquiring a first voltage value of a resistor in an absolute pressure sensor and a second voltage value of the resistor in a differential pressure sensor;
step S200, determining a first air pressure of the external environment according to the first voltage value, and determining a first air pressure difference between the inside of the shell and the inside of the cavity according to the second voltage value;
step S300, determining a second air pressure in the cavity according to the first air pressure difference and the first air pressure, wherein the second air pressure is a target air pressure of the external environment;
referring to fig. 1, the air pressure detecting apparatus includes: a housing 10, the housing 10 being provided with a first opening 11; an absolute pressure sensor 20 provided in the housing 10; the fixing piece 30 is arranged in the shell 10 and provided with a cavity 31, the fixing piece 10 is provided with a second opening (not marked) and a third opening 32 which are communicated with the cavity 31, and the third opening 32 is communicated with the first opening 11; and a differential pressure sensor 40 disposed at the second opening to detect a differential pressure between the inside of the cavity 31 and the inside of the housing 10.
The air pressure detection device determines the resistance variation of the resistor by acquiring the voltage value of the resistor in the absolute pressure sensor, wherein the resistance variation is related to the absolute pressure of air in the shell acting on a pressure membrane in the absolute pressure sensor, and at the moment, the processor can calculate the absolute pressure according to the resistance variation, wherein the absolute pressure is the first air pressure in the shell; in addition, the processor obtains the voltage value of the resistor in the absolute pressure sensor and obtains the voltage value of the resistor in the differential pressure sensor at the same time, the air pressure difference between the inside of the shell and the cavity is obtained according to the voltage value, at the moment, the target air pressure is obtained by subtracting the air pressure difference from the measured first air pressure, and the target air pressure is the target air pressure of the external environment.
Specifically, the absolute pressure sensor measures a first air pressure inside the casing and is defined as P1, the target air pressure is defined as P0, the differential pressure sensor measures a first air pressure difference as Δ P, Δ P = P1-P0, and P1- Δ P = P0, so that P0 can be calculated according to known P1 and Δ P. Note that the detection time point corresponding to P1 is the same as the detection time point corresponding to Δ P.
In another embodiment, the housing 10 is provided with the fourth opening 12, so that air in the external environment flows into the housing 10 through the fourth opening, so that the absolute pressure sensor 20 can detect the air pressure in the external environment, if the air pressure fluctuation detected by the absolute pressure sensor 20 in a period of time is small, the air pressure can be the target air pressure corresponding to the external environment in the period of time, if the air pressure fluctuation is large, the air pressure detected by the absolute pressure sensor 20 needs to be combined with the air pressure difference detected by the differential pressure sensor 40 to obtain the air pressure in the cavity, and the air pressure in the cavity is used as the target air pressure of the external environment. In the technical scheme that this embodiment provided, atmospheric pressure detection device calculates through obtaining the first atmospheric pressure that absolute pressure sensor measured in the casing and the first atmospheric pressure difference between the casing that differential pressure sensor measured and the cavity, obtains the second atmospheric pressure in the cavity to obtain external environment's target atmospheric pressure, because the air in the cavity can not receive the influence of external factor and produce undulant, make the atmospheric pressure in the environment that awaits measuring that pressure detection device can be accurate.
Referring to fig. 4, fig. 4 is a diagram of another embodiment of the air pressure detecting device of the present invention, and based on the above embodiment, the step S300 includes:
step S310, determining each first air pressure and the time period of each first air pressure difference;
step S320, determining a first air pressure curve according to the time period and each first air pressure, and determining a first pressure difference curve according to the time period and each first air pressure difference;
step S330, performing phase inversion processing on the first differential pressure curve to obtain a second differential pressure curve;
step S340, performing superposition processing on the second differential pressure curve and the first air pressure curve to obtain a second air pressure curve corresponding to the cavity;
and step 350, determining a second air pressure corresponding to the cavity in the time period according to the second air pressure curve.
In an embodiment, the housing has a fourth opening, and the absolute pressure sensor detects the air pressure of the external environment through the fourth opening, and since the air in the external environment can flow into the housing, the air pressure in the housing fluctuates, so that the air pressure detection device only calculates the air pressure of the cavity at a certain time point, which is inaccurate. In this regard, in the present embodiment, the air pressure detection device obtains the air pressure of the cavity in the time period to accurately obtain the target air pressure of the external environment.
Specifically, after acquiring a plurality of first air pressures and a plurality of first air pressure differences, the air pressure detection device determines each first air pressure and a time period in which each first air pressure difference is located;
the air pressure detection device detects the first air pressure and the first air pressure difference simultaneously, so that the time periods of the first air pressure and the first air pressure difference are the same, and therefore a first air pressure curve can be generated according to each first air pressure and each time period, and a first pressure difference curve can be generated according to each first air pressure difference and each time period; the first pressure difference curve is obtained by subtracting the parallel straight line from the first air pressure curve, and the waveform of the first pressure difference curve is consistent with that of the first air pressure curve;
after the first pressure difference curve and the first pressure difference curve are obtained, the air pressure detection device performs phase inversion processing on the first pressure difference, namely, the first pressure difference curve is symmetrically processed, specifically, the first pressure difference curve and the first pressure difference curve are located in the same coordinate system, the air pressure detection device takes a time axis in the coordinate system as a target axis, and then the target axis is taken as a symmetric axis, and the first pressure difference curve is symmetrically processed to obtain a second pressure difference curve;
after the second pressure difference curve is obtained, performing superposition processing on the second pressure difference curve and the first pressure curve to obtain a second pressure curve corresponding to the cavity, specifically, each third pressure difference on the second pressure difference curve has a corresponding first pressure on the first pressure curve, that is, the time point of the third pressure difference is the same as the time point of the first pressure corresponding to the third pressure difference time point, and adding the numerical value of the third pressure difference and the numerical value of the first pressure to obtain each second pressure, wherein each second pressure constitutes a second pressure curve, and the second pressure curve is each second pressure corresponding to the cavity in a time period; the first pressure curve, the first differential pressure curve, and the second differential pressure curve can be referred to fig. 5;
when the air pressure in the cavity is affected, the second air pressure curve has a situation that the difference value between a certain air pressure and other air pressures is large, at the moment, the air pressure can be removed, so that a second air pressure difference between second air pressures corresponding to adjacent time points in the second air pressure curve is calculated, then the second air pressure difference larger than a preset difference value is taken as a target air pressure difference, the target air pressure difference corresponds to two second air pressures, and as the target air pressure differences are adjacent in pairs, the two adjacent target air pressure differences correspond to one target second air pressure, for example, 40 target air pressure differences exist, 20 target second air pressures deviating from the second air pressure curve should exist; and then removing each second target air pressure to obtain a corrected second air pressure curve, so that the corresponding second air pressure of the cavity in the time period can be obtained according to the corrected second air pressure curve, for example, the average value of the numerical values corresponding to each point in the corrected second air pressure curve can be obtained, and the average value is the corresponding second air pressure of the cavity in the time period.
In the technical scheme provided by this embodiment, the air pressure detection device determines each first air pressure and a time period in which each first air pressure difference is located, so as to generate a corresponding first pressure curve and a corresponding first pressure difference curve, and then obtains a second air pressure curve of the cavity according to the first pressure curve and the first pressure difference curve, so that a target air pressure corresponding to an external environment in the time period can be determined through the second air pressure curve, and the detection accuracy of the air pressure detection device is further improved.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
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 (8)
1. An air pressure detecting device, characterized by comprising:
a housing provided with a first opening;
the absolute pressure sensor is arranged in the shell;
the fixing piece is arranged in the shell and provided with a cavity, the fixing piece is provided with a second opening and a third opening which are communicated with the cavity, and the third opening is communicated with the first opening;
the differential pressure sensor is arranged at the second opening so as to detect the differential pressure in the cavity and between the cavity and the shell;
the fixing piece comprises a wall surface, a hollow structure is arranged on the wall surface in a surrounding mode, the hollow structure is a cavity, and the lower portion of the cavity is in a funnel shape;
the shell is provided with a fourth opening, so that air in the external environment flows into the shell through the fourth opening, and the absolute pressure sensor detects the air pressure of the air in the external environment;
the air pressure detection device further comprises a processor, a memory and an air pressure detection program which is stored on the memory and can run on the processor, and the air pressure detection program realizes the following steps when being executed by the processor:
detecting pressure fluctuations in an external environment by an absolute pressure sensor;
if the air pressure fluctuation in the external environment is small, directly acquiring the target air pressure of the external environment through the absolute pressure sensor;
if the air pressure fluctuation in the external environment is large, acquiring a first voltage value of a resistor in the absolute pressure sensor and a second voltage value of a resistor in the differential pressure sensor;
determining a first air pressure of the external environment according to the first voltage value, and determining a first air pressure difference between the inside of the shell and the inside of the cavity according to the second voltage value;
and determining a second air pressure in the cavity according to the first air pressure difference and the first air pressure, wherein the second air pressure is a target air pressure of the external environment.
2. A washing machine characterized by comprising the air pressure detecting device according to claim 1.
3. The washing machine as claimed in claim 2, wherein the air pressure detecting device is provided at a bottom of a drum of the washing machine, the bottom of the drum being opened with an opening communicating with outside air.
4. An air pressure detecting method, characterized in that the air pressure detecting method is applied to the air pressure detecting apparatus according to claim 1;
the air pressure detection method comprises the following steps:
detecting pressure fluctuations in an external environment by an absolute pressure sensor;
if the air pressure fluctuation in the external environment is small, directly acquiring the target air pressure of the external environment through the absolute pressure sensor;
if the air pressure fluctuation in the external environment is large, acquiring a first voltage value of a resistor in an absolute pressure sensor and a second voltage value of a resistor in a differential pressure sensor;
determining a first air pressure of the external environment according to the first voltage value, and determining a first air pressure difference between the inside of the shell and the inside of the cavity according to the second voltage value;
and determining a second air pressure in the cavity according to the first air pressure difference and the first air pressure, wherein the second air pressure is a target air pressure of the external environment.
5. The method of claim 4, wherein the step of determining a second air pressure within the cavity based on the first air pressure differential and the first air pressure comprises:
determining each first air pressure and a time period of each first air pressure difference;
determining a first air pressure curve according to the time period and each first air pressure, and determining a first pressure difference curve according to the time period and each first air pressure difference;
carrying out reverse phase processing on the first differential pressure curve to obtain a second differential pressure curve;
superposing the second pressure difference curve and the first air pressure curve to obtain a second air pressure curve corresponding to the cavity;
and determining a second air pressure corresponding to the cavity in the time period according to the second air pressure curve.
6. The method of claim 5, wherein the step of determining a second air pressure corresponding to the cavity over the time period based on the second air pressure profile comprises:
calculating a second air pressure difference between second air pressures corresponding to adjacent time points on the second air pressure curve;
taking a second air pressure difference larger than a preset difference value as a target air pressure difference, and determining a target second air pressure corresponding to the target air pressure difference;
removing each target second air pressure from the second air pressure curve to obtain a corrected second air pressure curve;
and determining the corresponding second air pressure of the cavity in the time period according to the corrected second air pressure curve.
7. The air pressure detecting method according to claim 5, wherein the step of performing an inverse process on the first differential pressure curve to obtain the second differential pressure curve comprises:
taking a time axis in a coordinate system where the first pressure difference curve is located as a target axis;
and carrying out symmetrical processing on the first differential pressure curve by taking the target axis as a symmetrical axis so as to obtain a second differential pressure curve symmetrical to the first differential pressure curve.
8. The air pressure detecting method according to claim 5, wherein the step of superimposing the second differential pressure curve and the first air pressure curve to obtain a second air pressure curve corresponding to the cavity comprises:
determining each third air pressure difference in the second pressure difference curve, and determining a first air pressure corresponding to each third air pressure difference in the first air pressure curve, wherein the time point corresponding to the third air pressure difference is the same as the time point of the first air pressure corresponding to the third air pressure difference;
and superposing each third air pressure difference in the second pressure difference curve to the first air pressure corresponding to each third air pressure difference so as to obtain a second air pressure curve corresponding to the cavity.
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