CN113220045B - Air pressure control device and method - Google Patents

Abstract

The invention provides a pneumatic control device and a method, comprising the following steps: the device comprises a pressure container to be tested, a pressure sensor, an A/D conversion module, an MCU and a pneumatic actuator, wherein the pressure sensor is arranged in the pressure container to be tested; the pressure sensor is connected with the A/D conversion module, and the A/D conversion module and the pneumatic actuator are respectively connected with the MCU; the pressure sensor detects the simulated pressure value of the pressure container to be detected; the A/D conversion module is used for converting the analog pressure value to obtain a digital pressure value; the MCU is used for obtaining a pressure difference value according to the digital pressure value and a set pressure value and obtaining the ventilation volume by the pressure difference value through a PID (proportion integration differentiation) pulse algorithm; comparing the ventilation volume with the measured pressure value, and sending control instruction information to a pneumatic actuating mechanism according to the comparison result; the pneumatic actuating mechanism is used for inflating or deflating the pressure container to be measured according to the control instruction information, can stably adjust the pressure, achieves closed-loop control, and is simple in structure and low in cost.

Description

Air pressure control device and method

technical field

The invention relates to the field of control, in particular to an air pressure control device and method.

Background technique

At present, the common air pressure controllers are Druck PACE5000/6000, mensor CPC4000 and CPC9000. The above air pressure controllers usually use parallel valve bodies to adjust the output pressure, or adjust the output pressure by means of gas flow.

However, the above air pressure controller has a complicated structure and high cost.

Contents of the invention

In view of this, the object of the present invention is to provide an air pressure control device and method, which can stably adjust the pressure and realize closed-loop control, and has a simple structure and low cost.

In the first aspect, an embodiment of the present invention provides an air pressure control device, which includes a pressure vessel to be tested, a pressure sensor, an A/D conversion module, an MCU, and a pneumatic actuator, and the pressure sensor is arranged on the pressure vessel to be tested. Inside;

The pressure sensor is connected to the A/D conversion module, and the A/D conversion module and the pneumatic actuator are respectively connected to the MCU;

The pressure sensor is used to detect the analog pressure value of the pressure vessel to be tested;

The A/D conversion module is used to convert the analog pressure value to obtain a digital pressure value;

The MCU is used to obtain a pressure difference value according to the digital pressure value and a set pressure value, and obtain a ventilation volume by using the pressure difference value through a PID pulse algorithm; compare the ventilation volume with the measured pressure value, sending control instruction information to the pneumatic actuator according to the comparison result;

The pneumatic actuator is used to inflate or deflate the pressure vessel to be tested according to the control instruction information.

Further, the MCU is configured to send inflation instruction information to the pneumatic actuator when the ventilation volume is smaller than the measured pressure value; The actuator sends a deflation command message.

Further, the pneumatic actuator is used to inflate the pressure vessel under test according to the inflation instruction information;

or,

Deflate the pressure vessel under test according to the deflation instruction information.

Further, the pneumatic actuator includes an air source assembly, an air pressure control assembly and a vacuum tank, and the air source assembly and the vacuum tank are respectively connected to the air pressure control assembly.

Further, the air pressure control assembly includes a first valve group, a second valve group, a first buffer gas tank, and a first high-precision gauge. After the first valve group and the second valve group are connected in parallel, they are sequentially connected to the The first buffer gas tank is connected with the first high-precision meter;

The first valve group includes a first common valve, a second buffer gas tank, a first accuracy gauge, a second common valve and a first high-frequency valve, the first common valve, the second buffer gas tank and all The first precision meter is connected in sequence, and the second ordinary valve and the first high-frequency valve are connected in parallel with the first precision meter and the first buffer gas tank respectively;

The second valve group includes a third common valve, a fourth common valve, a third buffer gas tank, a second accuracy meter, a second high-frequency valve and a fifth common valve, and the third common valve is connected to the fourth common valve. After the ordinary valve is connected in parallel, it is connected with the third buffer gas tank and the second accuracy meter in turn, and the second high frequency valve and the fifth ordinary valve are connected in parallel with the second accuracy meter and the second accuracy meter respectively. The first buffer gas tank is connected, and the vacuum tank is connected with the fourth common valve.

Further, the MCU is configured to adjust the first common valve so that the pressure value entering the second buffer gas tank is greater than the set pressure value, and open the first high-frequency valve to Inflate the pressure vessel;

When the pressure value in the pressure vessel to be tested is greater than the set pressure value, the second high-frequency valve is opened, and the Deflate the pressure vessel.

Further, the air pressure control assembly also includes a third valve group, a fourth valve group, a fourth buffer gas tank, and a second high-precision meter. After the third valve group and the fourth valve group are connected in parallel, they are sequentially connected with the The fourth buffer gas tank is connected to the second high-precision meter;

The third valve group includes a sixth ordinary valve and a third high-frequency valve, the sixth ordinary valve and the third high-frequency valve are connected in parallel; the fourth valve group includes a seventh ordinary valve and a fourth high-frequency valve frequency valve, the seventh common valve and the fourth high frequency valve are connected in parallel.

Further, the MCU is configured to adjust the sixth ordinary valve so that the pressure value entering the fourth buffer gas tank is greater than the set pressure value, and open the third high-frequency valve to Inflate the pressure vessel;

When the pressure value in the pressure vessel to be tested is greater than the set pressure value, open the fourth high frequency valve, and adjust the pressure of the pressure vessel to be tested by adjusting the third high frequency valve and the fourth high frequency valve. Deflate the pressure vessel.

An embodiment of the present invention provides an air pressure control method, including the air pressure control device as described above, the air pressure control device includes a pressure vessel to be tested, a pressure sensor, an A/D conversion module, an MCU and a pneumatic actuator, and the pressure sensor is set In the pressure vessel to be tested; the method includes:

The pressure sensor detects the simulated pressure value of the pressure vessel to be tested;

The A/D conversion module converts the analog pressure value to obtain a digital pressure value;

The MCU obtains the pressure difference according to the digital pressure value and the set pressure value, and uses the pressure difference to obtain the ventilation volume through the PID pulse algorithm; compares the ventilation volume with the measured pressure value, and according to the comparison result sending control instruction information to the pneumatic actuator;

The pneumatic actuator inflates or deflates the pressure vessel under test according to the control instruction information.

In the third aspect, the embodiment of the present invention provides an electronic device, including a memory and a processor, the memory stores a computer program that can run on the processor, and when the processor executes the computer program, the above-mentioned described method.

The embodiment of the present invention provides an air pressure control device and method, including: a pressure vessel to be tested, a pressure sensor, an A/D conversion module, an MCU and a pneumatic actuator, and the pressure sensor is arranged in the pressure vessel to be tested; the pressure sensor and the A/D The conversion module is connected, and the A/D conversion module and the pneumatic actuator are respectively connected with the MCU; the pressure sensor is used to detect the analog pressure value of the pressure vessel to be tested; the A/D conversion module is used to convert the analog pressure value to obtain a digital Pressure value; MCU is used to obtain the pressure difference value according to the digital pressure value and the set pressure value, and the pressure difference value is obtained through the PID pulse algorithm to obtain the ventilation volume; the ventilation volume is compared with the measured pressure value, and the comparison result is sent to the pneumatic actuator Control instruction information; the pneumatic actuator is used to inflate or deflate the pressure vessel to be tested according to the control instruction information, which can stabilize the pressure and realize closed-loop control, and has a simple structure and low cost.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the above-mentioned objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

FIG. 1 is a schematic diagram of an air pressure control device provided in Embodiment 1 of the present invention;

Fig. 2 is a schematic diagram of the execution process of the air pressure control device provided by Embodiment 1 of the present invention;

Fig. 3 is a schematic structural diagram of a pneumatic actuator provided by Embodiment 1 of the present invention;

Fig. 4 is a schematic structural diagram of another pneumatic actuator provided by Embodiment 1 of the present invention;

FIG. 5 is a flow chart of the air pressure control method provided by Embodiment 2 of the present invention.

icon:

1-pressure vessel to be tested; 2-pressure sensor; 3-A/D conversion module; 4-MCU; 5-pneumatic actuator; 6-power management module; 7-communication interface; 8-HDMI.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. the embodiment. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

To facilitate understanding of this embodiment, the following describes the embodiment of the present invention in detail.

Embodiment one:

FIG. 1 is a schematic diagram of an air pressure control device provided in Embodiment 1 of the present invention.

Referring to Fig. 1, the device includes a pressure vessel 1 to be tested, a pressure sensor 2, an A/D conversion module 3, an MCU 4 and a pneumatic actuator 5, and the pressure sensor 2 is arranged in the pressure vessel 1 to be tested;

The pressure sensor 2 is connected to the A/D conversion module 3, and the A/D conversion module 3 and the pneumatic actuator 5 are respectively connected to the MCU4;

The pressure sensor 2 is used to detect the analog pressure value of the pressure vessel 1 to be tested;

The A/D conversion module 3 is used to convert the analog pressure value to obtain a digital pressure value;

MCU4 is used to obtain the pressure difference value according to the digital pressure value and the set pressure value, and obtain the ventilation volume through the PID pulse algorithm through the pressure difference value; compare the ventilation volume with the measured pressure value, and send control to the pneumatic actuator 5 according to the comparison result instruction information;

The pneumatic actuator 5 is used to inflate or deflate the pressure vessel 1 to be tested according to the control instruction information.

The system also includes a power management module 6, HDMI (High Definition Multimedia Interface, high-definition multimedia interface) 8 and communication interface 7, the power management module 6 is connected with the pressure sensor 2, A/D conversion module 3, MCU4, pneumatic actuator 5, The HDMI 8 is connected with the communication interface 7 for providing power therefor. MCU4 can send instruction information through HDMI8 and communication interface 7, or receive instruction information through HDMI8 and communication interface 7.

In this embodiment, the pressure sensor detects the analog pressure value of the pressure vessel to be tested, and the A/D conversion module converts the analog pressure value to obtain a digital pressure value; the MCU compares the digital pressure value with the set pressure value to obtain a pressure difference value , and the pressure difference is used as the input of the PID pulse algorithm, and the output is the ventilation volume; the ventilation volume is compared with the measured pressure value to obtain the comparison result; according to the comparison result, the pneumatic actuator is controlled to inflate or deflate the pressure vessel to be tested, The pressure can be stably adjusted to realize closed-loop control, and the structure is simple and the cost is low, which can satisfy the function of the low-pressure high-frequency valve to control the air pressure with high precision.

Further, the MCU4 is used to send inflation command information to the pneumatic actuator 5 when the ventilation volume is less than the measured pressure value; and send deflation command information to the pneumatic actuator 5 when the ventilation volume is greater than the measured pressure value.

Further, the pneumatic actuator 5 is used to inflate the pressure vessel 1 to be tested according to the inflation instruction information;

or,

Deflate the pressure vessel 1 to be tested according to the deflation instruction information.

Specifically, referring to FIG. 2 , the MCU is provided with a set pressure value, and the MCU compares the digital pressure value with the set pressure value to obtain a pressure difference value, and uses the pressure difference value as the input of the PID pulse algorithm, and outputs the ventilation volume; Compare the ventilation volume with the measured pressure value to obtain the comparison result; control the pneumatic actuator to inflate or deflate the pressure vessel to be tested according to the comparison result.

Further, the pneumatic actuator includes an air source assembly, an air pressure control assembly and a vacuum tank, and the air source assembly and the vacuum tank are respectively connected to the air pressure control assembly.

Here, the gas source assembly can be used as a buffer component to prevent overfilling and adapt to the surrounding pressure vessel to be tested.

Further, referring to Fig. 3, the air pressure control assembly includes the first valve group, the second valve group, the first buffer gas tank and the first high-precision meter. After the first valve group and the second valve group are connected in parallel, they are connected with the first buffer The gas tank is connected with the first high-precision meter;

The first valve group includes a first common valve, a second buffer gas tank, a first accuracy gauge, a second common valve and a first high-frequency valve, the first common valve, the second buffer gas tank and the first precision gauge are connected in sequence, The second common valve and the first high-frequency valve are connected in parallel with the first accuracy meter and the first buffer gas tank respectively;

The second valve group includes the third ordinary valve, the fourth ordinary valve, the third buffer gas tank, the second precision meter, the second high-frequency valve and the fifth ordinary valve. After the third ordinary valve is connected in parallel with the fourth ordinary valve, the It is connected with the third buffer gas tank and the second precision gauge, the second high frequency valve and the fifth common valve are connected in parallel and respectively connected with the second precision gauge and the first buffer gas tank, and the vacuum tank is connected with the fourth normal valve .

Specifically, the first precision gauge and the second precision gauge are provided with a pre-charge pressure value. When the pneumatic actuator inflates the pressure vessel to be tested, the pre-charge pressure value is greater than the set pressure value; when the pneumatic actuator deflates the pressure vessel to be tested , the pre-charge pressure value is less than the set pressure value. The pre-charge pressure value of the first high precision gauge is the set pressure value. The first high-precision gauge is a measuring gauge for setting the air pressure, that is, the air pressure to be regulated will be based on this gauge.

The function of the first high-frequency valve and the second high-frequency valve is to fine-tune the flow of air pressure by switching on and off when the air pressure value to be controlled is close to the set pressure value. The function of the first common valve, the second common valve, the third common valve, the fourth common valve and the fifth common valve is to pre-set the air pressure environment. For example, when the set pressure value is 300kPa and the air source air pressure is 800kPa, if the first high-frequency valve is directly adjusted, the air intake volume each time is affected by the air pressure difference and it is difficult to control accurately. Therefore, in order to reduce the complexity of the algorithm, The first ordinary valve is adjusted by means of pre-adjusting air pressure, so that the pressure value at the intake end of the first high-frequency valve is slightly higher than the set pressure value. Similarly, when the air pressure is lowered, it is necessary to adjust the third ordinary valve so that the pressure value at the rear end of the second high frequency valve is slightly lower than the set pressure value.

The functions of the first buffer gas tank, the second buffer gas tank and the third buffer gas tank are to smooth the fluctuation of air pressure. When the first high-frequency valve operates, air intake or exhaust will cause rapid fluctuations in air pressure. At this time, there will be sudden changes in high precision. Through the buffer air tank, the fluctuations can be greatly stabilized and more accurate results can be obtained.

The fourth common valve is used when controlling the vacuum, that is, opening the fourth common valve can control the pressure of the pressure vessel to be tested to be less than the absolute pressure of 100kPa.

Further, the MCU is used to adjust the first common valve so that the pressure value entering the second buffer gas tank is greater than the set pressure value, and open the first high-frequency valve to inflate the pressure vessel to be tested;

When the pressure value in the pressure vessel to be tested is greater than the set pressure value, the second high-frequency valve is opened, and the pressure vessel to be tested is deflated by adjusting the first high-frequency valve and the second high-frequency valve.

Specifically, the MCU adjusts the first common valve so that the pressure value entering the second buffer gas tank is greater than the set pressure value, and opens the first high frequency valve to inflate the pressure vessel to be tested. When the pressure value in the pressure vessel to be tested is greater than the set pressure value, the second high-frequency valve is opened, and the first high-frequency valve and the second high-frequency valve are continuously adjusted to deflate the pressure vessel to be tested. During the dynamic adjustment process, ensure that the pressure value of the pressure vessel to be tested reaches the set pressure value. During this process, the pressure value of the third buffer gas tank should be kept slightly lower than the set pressure value, so that the deflation process is controllable.

In addition, when the pressure difference is within the set pressure threshold range and the pneumatic actuator deflates the pressure vessel to be tested, the first high-frequency valve and the second high-frequency valve need to be opened; when the pressure difference is greater than the set pressure threshold range , it is necessary to open the third ordinary valve, the fourth ordinary valve and the fifth ordinary valve.

Further, referring to Fig. 4, the air pressure control assembly also includes a third valve group, a fourth valve group, a fourth buffer gas tank and a second high-precision meter. After the third valve group and the fourth valve group are connected in parallel, they are connected with the fourth The buffer gas tank is connected with the second high-precision meter;

The third valve group includes the sixth ordinary valve and the third high-frequency valve, the sixth ordinary valve and the third high-frequency valve are connected in parallel; the fourth valve group includes the seventh ordinary valve and the fourth high-frequency valve, the seventh ordinary valve and the The fourth high frequency valve is connected in parallel.

Further, the MCU is used to adjust the sixth ordinary valve so that the pressure value entering the fourth buffer gas tank is greater than the set pressure value, and open the third high-frequency valve to inflate the pressure vessel to be tested;

When the pressure value in the pressure vessel to be tested is greater than the set pressure value, the fourth high-frequency valve is opened, and the pressure vessel to be tested is deflated by adjusting the third high-frequency valve and the fourth high-frequency valve.

Specifically, the function of the fourth buffer gas tank is also to moderate the fluctuation of air pressure. The MCU adjusts the sixth ordinary valve so that the pressure value entering the fourth buffer gas tank is greater than the set pressure value, and opens the third high-frequency valve to inflate the pressure vessel to be tested; when the pressure value in the pressure vessel to be tested is greater than the set pressure value, open the fourth high-frequency valve, continuously adjust the third high-frequency valve and the fourth high-frequency valve, and deflate the pressure vessel to be tested. During the dynamic adjustment process, ensure that the pressure value of the pressure vessel to be tested reaches the set pressure value.

In addition, when the pressure difference is within the set pressure threshold range and the pneumatic actuator deflates the pressure vessel to be tested, the third high-frequency valve and the fourth high-frequency valve need to be opened; when the pressure difference is greater than the set pressure threshold range , the seventh ordinary valve needs to be opened.

The embodiment of the present invention provides an air pressure control device, comprising: a pressure vessel to be tested, a pressure sensor, an A/D conversion module, an MCU and a pneumatic actuator, and the pressure sensor is arranged in the pressure vessel to be tested; the pressure sensor and the A/D conversion module The A/D conversion module and the pneumatic actuator are respectively connected to the MCU; the pressure sensor is used to detect the analog pressure value of the pressure vessel to be tested; the A/D conversion module is used to convert the analog pressure value to obtain a digital pressure value ;MCU is used to obtain the pressure difference value according to the digital pressure value and the set pressure value, and the pressure difference value is obtained through the PID pulse algorithm to obtain the ventilation volume; the ventilation volume is compared with the measured pressure value, and the control command is sent to the pneumatic actuator according to the comparison result Information; the pneumatic actuator is used to inflate or deflate the pressure vessel to be tested according to the control instruction information, which can stably adjust the pressure and realize closed-loop control, and has a simple structure and low cost.

Embodiment two:

Fig. 5 is a flow chart of the air pressure control method provided by the embodiment of the present invention.

Referring to Fig. 5, applied to the air pressure control device as described above, the air pressure control device includes a pressure vessel to be tested, a pressure sensor, an A/D conversion module, an MCU and a pneumatic actuator, and the pressure sensor is arranged in the pressure vessel to be tested; the method Include the following steps:

Step S101, the pressure sensor detects the simulated pressure value of the pressure vessel to be tested;

Step S102, the A/D conversion module converts the analog pressure value to obtain a digital pressure value;

Step S103, the MCU obtains the pressure difference according to the digital pressure value and the set pressure value, and uses the pressure difference to obtain the ventilation volume through the PID pulse algorithm; compares the ventilation volume with the measured pressure value, and sends a control command to the pneumatic actuator according to the comparison result information;

Step S104, the pneumatic actuator inflates or deflates the pressure vessel to be tested according to the control instruction information.

The embodiment of the present invention provides an air pressure control method, comprising: the pressure sensor detects the analog pressure value of the pressure vessel to be tested; the A/D conversion module converts the analog pressure value to obtain a digital pressure value; The pressure difference value is obtained, and the pressure difference is obtained through the PID pulse algorithm to obtain the ventilation volume; the ventilation volume is compared with the measured pressure value, and the control command information is sent to the pneumatic actuator according to the comparison result; the pneumatic actuator treats the measured pressure according to the control command information. When the container is inflated or deflated, the pressure can be stably adjusted to realize closed-loop control, and the structure is simple and the cost is low.

An embodiment of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and operable on the processor. When the processor executes the computer program, the steps of the air pressure control method provided in the above embodiments are implemented.

An embodiment of the present invention also provides a computer-readable medium with a non-volatile program code executable by a processor. A computer program is stored on the computer-readable medium. When the computer program is run by the processor, the air pressure control of the above-mentioned embodiment is executed. method steps.

The computer program product provided by the embodiments of the present invention includes a computer-readable storage medium storing program codes. The instructions included in the program codes can be used to execute the methods described in the foregoing method embodiments. For specific implementation, please refer to the method embodiments. , which will not be repeated here.

Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the above-described system and device can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In addition, in the description of the embodiments of the present invention, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes. .

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

Finally, it should be noted that: the above-described embodiments are only specific implementations of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting them, and the scope of protection of the present invention is not limited thereto, although referring to the foregoing The embodiment has described the present invention in detail, and those skilled in the art should understand that any person familiar with the technical field can still modify the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention Changes can be easily thought of, or equivalent replacements are made to some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of the present invention within the scope of protection. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (6)

1. The air pressure control device is characterized by comprising a pressure container to be tested, a pressure sensor, an A/D conversion module, an MCU and a pneumatic actuator, wherein the pressure sensor is arranged in the pressure container to be tested;

the pressure sensor is connected with the A/D conversion module, and the A/D conversion module and the pneumatic actuating mechanism are respectively connected with the MCU;

the pressure sensor is used for detecting the simulated pressure value of the pressure container to be detected;

the A/D conversion module is used for converting the analog pressure value to obtain a digital pressure value;

the MCU is used for obtaining a pressure difference value according to the digital pressure value and a set pressure value and obtaining ventilation capacity through a PID pulse algorithm according to the pressure difference value; comparing the ventilation volume with a measured pressure value, and sending control instruction information to the pneumatic actuating mechanism according to a comparison result;

the pneumatic actuating mechanism is used for inflating or deflating the pressure container to be tested according to the control instruction information;

the pneumatic actuating mechanism comprises an air source assembly, an air pressure control assembly and a vacuum tank, wherein the air source assembly and the vacuum tank are respectively connected with the air pressure control assembly;

the air pressure control assembly comprises a first valve group, a second valve group, a first buffer air tank and a first high-precision gauge, and the first valve group and the second valve group are connected in parallel and then are sequentially connected with the first buffer air tank and the first high-precision gauge;

the first valve group comprises a first common valve, a second buffer gas tank, a first precision meter, a second common valve and a first high-frequency valve, the first common valve, the second buffer gas tank and the first precision meter are sequentially connected, and the second common valve and the first high-frequency valve are connected in parallel and then are respectively connected with the first precision meter and the first buffer gas tank;

the second valve group comprises a third common valve, a fourth common valve, a third buffer gas tank, a second precision meter, a second high-frequency valve and a fifth common valve, the third common valve and the fourth common valve are connected in parallel and then are sequentially connected with the third buffer gas tank and the second precision meter, the second high-frequency valve and the fifth common valve are connected in parallel and then are respectively connected with the second precision meter and the first buffer gas tank, and the vacuum tank is connected with the fourth common valve.

2. The air pressure control device according to claim 1, wherein the MCU is configured to transmit an inflation command message to the pneumatic actuator when the ventilation volume is less than the measured pressure value; and when the ventilation volume is larger than the measured pressure value, sending deflation instruction information to the pneumatic actuator.

3. The air pressure control device according to claim 2, wherein the pneumatic actuator is configured to inflate the pressure vessel to be tested according to the inflation command information;

or,

and deflating the pressure container to be tested according to the deflation instruction information.

4. The air pressure control device according to claim 1, wherein the MCU is configured to adjust the first common valve to make a pressure value entering the second buffer air tank greater than the set pressure value, and open the first high-frequency valve to inflate the pressure vessel to be tested;

and when the pressure value in the pressure container to be measured is greater than the set pressure value, opening the second high-frequency valve, and deflating the pressure container to be measured by adjusting the first high-frequency valve and the second high-frequency valve.

5. An air pressure control method, comprising the air pressure control device of any one of claims 1 to 4, wherein the air pressure control device comprises a pressure container to be tested, a pressure sensor, an A/D conversion module, an MCU and a pneumatic actuator, and the pressure sensor is arranged in the pressure container to be tested; the method comprises the following steps:

the pressure sensor detects the simulated pressure value of the pressure container to be detected;

the A/D conversion module converts the analog pressure value to obtain a digital pressure value;

the MCU obtains a pressure difference value according to the digital pressure value and a set pressure value, and the pressure difference value is used for obtaining ventilation capacity through a PID pulse algorithm; comparing the ventilation volume with a measured pressure value, and sending control instruction information to the pneumatic actuating mechanism according to a comparison result;

the pneumatic actuating mechanism inflates or deflates the pressure container to be tested according to the control instruction information;

the pneumatic actuating mechanism comprises an air source assembly, an air pressure control assembly and a vacuum tank, wherein the air source assembly and the vacuum tank are respectively connected with the air pressure control assembly;

the air pressure control assembly comprises a first valve group, a second valve group, a first buffer air tank and a first high-precision gauge, and the first valve group and the second valve group are connected in parallel and then are sequentially connected with the first buffer air tank and the first high-precision gauge;

the first valve group comprises a first common valve, a second buffer gas tank, a first precision meter, a second common valve and a first high-frequency valve, the first common valve, the second buffer gas tank and the first precision meter are sequentially connected, and the second common valve and the first high-frequency valve are connected in parallel and then respectively connected with the first precision meter and the first buffer gas tank;

the second valve group comprises a third common valve, a fourth common valve, a third buffer gas tank, a second precision meter, a second high-frequency valve and a fifth common valve, the third common valve and the fourth common valve are connected in parallel and then are sequentially connected with the third buffer gas tank and the second precision meter, the second high-frequency valve and the fifth common valve are connected in parallel and then are respectively connected with the second precision meter and the first buffer gas tank, and the vacuum tank is connected with the fourth common valve.

6. An electronic device comprising a memory and a processor, the memory having a computer program stored thereon, the computer program being executable on the processor, wherein the processor implements the method of claim 5 when executing the computer program.

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