High-speed high-precision air pressure control system and control method

Abstract

The invention provides a high-speed and high-precision air pressure control system and a control method. The high-speed and high-precision air pressure control system comprises an air source (1); the at least two air supply passages are connected in parallel, and each air supply passage sequentially comprises a pressure controller (3) which comprises a proportional overflow valve (31) and is used for controlling the air pressure of the corresponding air supply passage; the air storage device (4) is used for storing air so as to pre-adjust the air pressure of the corresponding air supply channel; the regulation and control electromagnetic valve terminal (5) comprises at least one electromagnetic valve (51) and is used for injecting gas into the filling chamber (6) so as to regulate and control the air pressure of the filling chamber (6); filling the chamber (6); and the pressure sensor (7) is used for feeding back the air pressure of the filling chamber (6) to the pressure controller (3). According to the air pressure control system disclosed by the invention, the air storage device is arranged behind the pressure controller to increase flow, and the regulation and control electromagnetic valve terminal is opened in combination with an optimal control strategy, so that high-precision, high-speed and high-stability air pressure regulation and control can be realized.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air pressure control, and in particular to a high-speed and high-precision air pressure control system and a control method. Background Art

[0002] High-speed and precise control of gas flow and pressure has good application prospects in various industrial fields. While ensuring that the specified pressure is reached quickly, the dynamic stability of the internal air pressure in the target area is ensured, thereby achieving a precise and stable control effect, which has extremely profound significance for automated production. However, due to the compressibility and expansion of gas, the irregular and uneven shape of the load cavity, and the nonlinearity of valves and pipelines, high-speed and high-precision regulation is very difficult. The relevant gas control solutions include the following three:

[0003] 1. Pulse valve regulation principle: two sets of high-frequency solenoid valves are used to switch between charging and discharging, and the closed-loop control is performed by the sensor. The advantages of this solution are simple structure and flexible regulation; the disadvantages are that it is limited by the pulse resolution and cannot achieve both high speed and high precision. If the pressure on the supply side is high, the resolution is low, the regulation speed is fast but the precision is low. On the contrary, if the pressure on the supply side is low, the resolution is high, the regulation precision is high but the speed is slow.

[0004] 2. Principle of direct-acting proportional relief valve: Pressure is adjusted through proportional solenoid, valve core and force transmission spring. After receiving the electrical signal, the proportional solenoid generates thrust to act on the valve cone, and works on the principle of balancing the air pressure force on the valve core and the spring force. The advantages of this scheme are easy use, high repeatability, small hysteresis, fast air replenishment response speed at a certain set pressure value, and thus high air pressure stability; the disadvantage is that the pressure changes slowly, and it takes a long time to reach a new stable air pressure during the switching process of different pressure values.

[0005] 3. Principle of voice coil driven proportional reversing valve: voice coil motor is used for driving, valve sleeve assembly controls flow and direction, and motor position closed loop is used. The advantages of this solution are high-step regulation, unlimited flow, strong impact resistance, and fast adjustment speed; the disadvantages are that an external closed loop is required, the control is difficult, the flow calibration is complex, and the control accuracy is poor.

[0006] Based on the above-mentioned gas control scheme, how to achieve high-precision, high-speed and high-stability gas pressure control effects is a topic that R&D personnel continue to pay attention to.

[0007] The above information disclosed in this section is only for understanding the background of the inventive concept of the present disclosure and therefore the above information may contain information that does not constitute the prior art. Summary of the invention

[0008] In view of this, the first aspect of the present disclosure provides a high-speed and high-precision air pressure control system, comprising: an air source; at least two air supply passages, which are connected in parallel, and each air supply passage includes in sequence along the air passage: a pressure controller, including a proportional overflow valve, for controlling the air pressure of the corresponding air supply passage; an air storage device, for storing air to pre-adjust the air pressure of the corresponding air supply passage; a regulating solenoid valve island, including at least one solenoid valve, for injecting gas into a filling chamber to regulate the air pressure of the filling chamber; a filling chamber; a pressure sensor, for feeding back the air pressure of the filling chamber to the pressure controller.

[0009] According to an embodiment of the present disclosure, the gas storage device is connected to a pressure controller; the pressure controller is used to control the gas pressure of the gas storage device.

[0010] According to an embodiment of the present disclosure, the number of solenoid valves in the regulating solenoid valve island is an even number.

[0011] According to an embodiment of the present disclosure, the number of solenoid valves in the regulating solenoid valve island is 4.

[0012] According to an embodiment of the present disclosure, each gas supply passage also includes: a filter located before the pressure controller, used to filter the gas provided by the gas source; a pressure relief valve located between the regulating solenoid valve island and the filling chamber, used to relieve the pressure of the filling chamber.

[0013] The second aspect of the present disclosure provides a control method according to the above-mentioned high-speed and high-precision air pressure control system, including: S1, obtaining a first target air pressure, closing all solenoid valves in the first air supply passage, and opening the air source and the pressure controller in the first air supply passage; S2, according to the first target air pressure, using the pressure controller in the first air supply passage to control the air storage device in the first air supply passage to a first pre-adjusted air pressure; wherein the first pre-adjusted air pressure has a first overshoot relative to the first target air pressure; S3, opening all solenoid valves in the first air supply passage to quickly and stably inflate the filling chamber to the first target air pressure.

[0014] According to an embodiment of the present disclosure, S3 also includes: opening all the solenoid valves in the first air supply passage, and after a first overshoot time, using the pressure controller in the first air supply passage to control the air storage device in the first air supply passage to a second pre-adjusted air pressure; wherein the second pre-adjusted air pressure has a second overshoot relative to the first target air pressure, and the second overshoot is less than the first overshoot.

[0015] According to an embodiment of the present disclosure, S1 includes obtaining a second target air pressure; S2 also includes: according to the second target air pressure, using a pressure controller in the second air supply passage to control the air storage device in the second air supply passage to a third pre-adjusted air pressure; wherein the third pre-adjusted air pressure has a third overshoot relative to the second target air pressure; after S3, it also includes: S4, closing all solenoid valves in the first air supply passage, opening all solenoid valves in the second air supply passage, and quickly and stably inflating the filling chamber to the second target air pressure.

[0016] According to an embodiment of the present disclosure, S1 includes obtaining a second target air pressure; after S3, it also includes: S5, according to the second target air pressure, using a pressure controller in the second air supply passage to control the air storage device in the second air supply passage to a third pre-adjusted air pressure; wherein the third pre-adjusted air pressure has a third overshoot relative to the second target air pressure; S6, closing all solenoid valves in the first air supply passage, opening all solenoid valves in the second air supply passage, and quickly and stably inflating the filling chamber to the second target air pressure.

[0017] According to an embodiment of the present disclosure, the target air pressure includes at least three sub-target air pressures, and the at least three sub-target air pressures are in a step relationship; after S6, it also includes: repeating steps S2~S4 and / or S5~S6 to quickly and stably inflate the filling chamber to the sub-target air pressure in sequence.

[0018] The air pressure control system and control method disclosed in the present invention, combined with the high precision and adaptive pressure stabilization principle of the proportional relief valve, set a pre-adjusted gas storage structure behind the pressure controller to increase the flow, feedback the air pressure through a high-frequency and high-precision pressure sensor, and open the solenoid valve island in combination with an optimized control strategy, thereby increasing the air pressure switching speed, and can also solve the air pressure fluctuation caused by leakage in the pipeline system, maintain the stability of the air pressure, and make the entire system have high-precision, high-speed, and high-stability air pressure control performance. At the same time, multi-channel parallel connection can also be used to achieve precise step-by-step air control. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0020] Figure 1 The structure diagram of a high-speed and high-precision air pressure control system according to an embodiment of the present disclosure is schematically shown;

[0021] Figure 2 The structure diagram of a high-speed and high-precision air pressure control system according to another embodiment of the present disclosure is schematically shown;

[0022] Figure 3 The schematic diagram of the structure of the proportional relief valve according to the embodiment of the present disclosure is shown;

[0023] Figure 4 A flow chart schematically shows a control method of a high-speed and high-precision air pressure control system according to an embodiment of the present disclosure;

[0024] Figure 5 A flowchart schematically shows a method for switching air pressure according to a high-speed and high-precision air pressure control system in an embodiment of the present disclosure;

[0025] Figure 6 A flowchart schematically shows a step control method according to a high-speed and high-precision air pressure control system in an embodiment of the present disclosure;

[0026] Figure 7 The pneumatic control curve of the high-precision and high-speed pneumatic pressure control system according to the embodiment 1 of the present disclosure is schematically shown;

[0027] Figure 8 The gas control curve according to Comparative Example 1 of the present disclosure is schematically shown;

[0028] Fig. 9 The gas control curve according to Comparative Example 2 of the present disclosure is schematically shown;

[0029] Fig.10 Schematically shows the air control curve of the high-precision and high-speed air pressure control system according to Example 2 of the present disclosure;

[0030] Description of reference numerals:

[0031] 1. Air source; 2. Filter; 3. Pressure controller; 31. Proportional overflow valve; 311. Proportional solenoid; 312. Push rod; 313. Spring; 314. Valve core; 4. Air storage device; 5. Control solenoid valve island; 51. Solenoid valve; 52. Pressure relief valve; 6. Filling chamber; 7. Pressure sensor. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0033] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0034] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0035] In the case of using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.). In the case of using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, or C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0036] Some block diagrams and / or flow charts are shown in the accompanying drawings. It should be understood that some boxes or combinations thereof in the block diagrams and / or flow charts can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that these instructions can create a device for implementing the functions / operations described in these block diagrams and / or flow charts when executed by the processor. The technology of the present disclosure can be implemented in the form of hardware and / or software (including firmware, microcode, etc.). In addition, the technology of the present disclosure can take the form of a computer program product on a computer-readable storage medium storing instructions, which can be used by an instruction execution system or in combination with an instruction execution system.

[0037] Figure 1 The structure diagram of a high-speed and high-precision air pressure control system according to an embodiment of the present disclosure is schematically shown. Figure 2 The structure diagram of a high-speed and high-precision air pressure control system according to another embodiment of the present disclosure is schematically shown.

[0038] Reference Figure 1~Figure 2 The high-speed and high-precision air pressure control system includes: an air source 1; at least two air supply passages, which are connected in parallel, and each air supply passage includes along the air passage: a pressure controller 3, including a proportional overflow valve 31, used to control the air pressure of the corresponding air supply passage; an air storage device 4, used to store air to pre-adjust the air pressure of the corresponding air supply passage; a regulating solenoid valve island 5, including at least one solenoid valve 51, used to inject gas into the filling chamber 6 to regulate the air pressure of the filling chamber 6; a filling chamber 6; a pressure sensor 7, used to feed back the air pressure of the filling chamber 6 to the pressure controller 3.

[0039] The gas source 1 in the air pressure control system is used to provide gas for regulating the air pressure. The type of gas does not affect the effect of air pressure regulation, and those skilled in the art can select it according to actual needs.

[0040] The air pressure control system includes at least two air supply passages, each of which can provide air with different air pressures to the filling chamber 6. By switching between air supply passages with different air pressure values, switching of different air pressures in the filling chamber 6 can be achieved. Figure 1 , there are two air supply passages; refer to Figure 2 , there are three gas supply passages; it can be understood that the number of gas supply passages can be greater than three, and the specific number can be determined according to actual needs. Each gas supply passage includes a pressure controller 3, a gas storage device 4 and a control solenoid valve island 5.

[0041] In some embodiments of the present disclosure, the gas storage device 4 is in communication with the pressure controller 3 ; the pressure controller 3 is used to control the gas pressure of the gas storage device 4 .

[0042] The functions of the gas storage device 4 include gas storage, rapid pressure adjustment, and pressure stabilization at the target gas pressure. The gas storage device 4 is connected in series with the pressure controller 3. When a single gas supply passage conducts gas or switches between different gas supply passages, the gas storage device 4 is used to pre-adjust the gas pressure to achieve the purpose of rapidly controlling the gas pressure in the filling chamber 6, thereby increasing the speed of gas pressure switching.

[0043] In some embodiments of the present disclosure, referring to Figure 3 The proportional relief valve 31 includes: a proportional solenoid 311; a push rod 312 and a spring 313, at least partially located in the proportional solenoid 311; a valve core 314, located at one end of the spring 313 away from the proportional solenoid 311; wherein the proportional relief valve 31 is configured as follows: in response to an electrical signal applied to the proportional solenoid 311, the states of the push rod 312 and the spring 313 change, so that the valve core 314 moves to a predetermined position, and adaptively regulates the air pressure.

[0044] The proportional relief valve 31 controls the position of the valve core 314 through the proportional solenoid 311, thereby controlling the opening of the valve port. The input signal (usually current) of the proportional solenoid is proportional to the displacement of the valve core, and the opening of the valve port can be accurately adjusted according to the change of the input signal. By utilizing the advantages of good pressure stabilization performance and high pressure control accuracy of the proportional relief valve 31, in conjunction with the high-frequency pressure sensor 7, high-precision control of the target air pressure in the filling chamber 6 can be achieved.

[0045] Exemplarily, a PID (Proportional Integral Derivative) strategy is adopted. Under a certain set target air pressure, the proportional relief valve 31 adaptively adjusts the opening of the valve port, thereby compensating for the pressure drop of the air storage device 4, so that the air pressure of the air storage device 4 is slightly higher than the target air pressure, which is conducive to quickly and stably reaching the target air pressure.

[0046] In some embodiments of the present disclosure, the number of solenoid valves 51 in the regulating solenoid valve island 5 is an even number. Preferably, the number of solenoid valves 51 in the regulating solenoid valve island 5 is 4.

[0047] The multi-way solenoid valve 51 is used to inject gas into the filling chamber 6, so as to regulate the air pressure in the filling chamber 6. The reason for adopting multi-way injection is to achieve a faster response speed and stable injection of gas, and to ensure stable switching of air pressure. The number of ways of the solenoid valve 51 is usually set to an even number, and experiments have confirmed that the optimal number is 4. When the solenoid valve 51 is injected with 1 way, the air pressure fluctuation in the filling chamber 6 is small, but the pressure increase speed in the filling chamber 6 is slow. When the solenoid valve 51 is injected with more than or equal to 4 ways, the pressure increase speed in the filling chamber 6 is fast, but the turbulence generated by the mutual influence between the multiple ways leads to unstable air pressure.

[0048] In some embodiments of the present disclosure, each gas supply passage also includes: a filter 2, located before the pressure controller 3, for filtering the gas provided by the gas source 1; a pressure relief valve 52, located between the regulating solenoid valve island 5 and the filling chamber 6, for relieving the pressure in the filling chamber 6.

[0049] The gas source 1 supplies gas to multiple gas supply passages, and a filter 2 is provided in each gas supply passage to filter the gas provided by the gas source 1. A pressure relief valve 52 is also provided downstream of the regulating solenoid valve island 5 composed of the multi-way solenoid valve 51 for pressure relief in an emergency.

[0050] The air pressure control system disclosed in the present invention can timely compensate for the leakage rate caused by the sealing problem through the combined action of the pressure controller and the air storage device; by utilizing the adaptive adjustment capability of the pressure controller, when the downstream air pressure is reduced due to leakage or other reasons, the valve opening of the pressure controller changes under the action of the control system, and the air pressure value of the air storage device is appropriately increased, thereby increasing the air pressure in the filling chamber and achieving high stability of the target air pressure. Conventional air control methods cannot achieve both high speed and high precision. To ensure efficiency, accuracy is sacrificed. Conversely, the improvement of accuracy will lead to a decrease in efficiency. The present invention can use the PID optimization to switch the pre-filling and pressure stabilization strategy, so that the filling chamber can quickly reach the target air pressure and form stability.

[0051] The control method of the control system is described in detail below based on the above-mentioned high-speed and high-precision control system.

[0052] Figure 4 The flowchart schematically shows a control method according to the above-mentioned high-speed and high-precision air pressure control system.

[0053] like Figure 4 As shown, the control method of the high-speed and high-precision air pressure control system may include operations S1 to S3.

[0054] In operation S1 , the first target air pressure is obtained, all the solenoid valves 51 in the first air supply passage are closed, and the air source 1 and the pressure controller 3 in the first air supply passage are opened.

[0055] In operation S2, according to the first target air pressure, the pressure controller 3 in the first air supply passage is used to control the air storage device 4 in the first air supply passage to a first pre-adjusted air pressure; wherein the first pre-adjusted air pressure has a first overshoot relative to the first target air pressure.

[0056] In operation S3 , all the solenoid valves 51 in the first air supply passage are opened to quickly and stably inflate the filling chamber 6 to the first target air pressure.

[0057] It should be noted that in operation S2, the air pressure of the pressure controller 3 needs to be pre-overregulated, so that the air storage device 4 also pre-overregulated the corresponding air pressure value. By pre-overregulated air pressure, the filling chamber 6 can be inflated quickly and stably to quickly reach the target air pressure.

[0058] In some embodiments of the present disclosure, S3 also includes: opening all the solenoid valves 51 in the first air supply passage, and after a first overshoot time, using the pressure controller 3 in the first air supply passage to control the air storage device 4 in the first air supply passage to a second pre-adjusted air pressure; wherein the second pre-adjusted air pressure has a second overshoot relative to the first target air pressure, and the second overshoot is less than the first overshoot.

[0059] At the moment of opening the regulating solenoid valve island 5, the air pressure value of the pressure controller 3 is adjusted to the target air pressure or the sum of the target air pressure and the first overshoot. At this time, the air pressure value of the air storage device 4 is the sum of the target air pressure and the first overshoot. The high air pressure of the air storage device 4 can quickly compensate for the head loss caused by the pipeline between the filling chamber 6 and the air storage device 4, so that the filling chamber 6 can quickly reach the target air pressure. Subsequently, the air pressure in the air storage device 6 drops, and the pressure controller 3 actively intervenes in the regulation, forming a balance between the two sides, which is externally manifested as the internal air pressure of the filling chamber 6 reaching the target air pressure and maintaining stability.

[0060] On the basis of the above embodiment, S1 includes obtaining the second target air pressure; S2 also includes: according to the second target air pressure, using the pressure controller 3 in the second air supply passage to control the air storage device 4 in the second air supply passage to the third pre-adjusted air pressure; wherein the third pre-adjusted air pressure has a third overshoot relative to the second target air pressure; after S3, it also includes: closing all the solenoid valves 51 in the first air supply passage, opening all the solenoid valves 51 in the second air supply passage, and quickly and stably inflating the filling chamber 6 to the second target air pressure. Or

[0061] S3 also includes: S5, according to the second target air pressure, using the pressure controller 3 in the second air supply passage to control the air storage device 4 in the second air supply passage to a third pre-adjusted air pressure; wherein the third pre-adjusted air pressure has a third overshoot relative to the second target air pressure; S6, closing all the solenoid valves 51 in the first air supply passage, opening all the solenoid valves 51 in the second air supply passage, and quickly and stably inflating the filling chamber 6 to the second target air pressure.

[0062] The method for switching air pressure by using the high-speed and high-precision air pressure control system disclosed in the present invention is as follows: Figure 5 As shown, in the preparation stage, all the solenoid valves 51 and the pressure relief valve 52 are closed, and the gas source 1, the filter 2, and the pressure controller 3 are opened; the pressure controllers 3 of each gas supply passage are set to their respective first pre-adjusted gas pressures, and the gas storage device 4 is filled to the corresponding first pre-adjusted gas pressure. In the control stage, all the solenoid valves 51 in the first gas supply passage are opened, and the gas pressure of the pressure controller 3 is set to the target gas pressure or the second pre-adjusted gas pressure. After the gas supply passage has worked for a period of time, it is determined whether to switch to the second target gas pressure. If so, all the solenoid valves 51 in the first gas supply passage are closed, and the gas pressure is switched to the second gas supply passage to control the gas pressure. The control process is similar to the control process of the first gas supply passage; if not, it is determined whether to change the target gas pressure, that is, whether the existing gas supply passage can provide the required target gas pressure. If so, it returns to the preparation stage and selects the gas supply passage that has not been put into use to reset the target gas pressure. If not, all the solenoid valves 51 are closed, and the pressure relief valve 52 is opened to ensure the safety of gas pressure use, and the control process ends.

[0063] The air pressure control system disclosed in the present invention utilizes the advantage of good pressure stability of the proportional relief valve when static, so that multiple groups of pressure controllers at different pressures cooperate with each other to achieve rapid, high-precision, and high-stability switching of the air pressure in the filling chamber; during the air supply of one of the air supply passages, the other air supply passage can change the target air pressure value of the air supply passage by changing the opening of the relief valve, that is, the two air supply passages can achieve rapid, high-precision, and high-stability switching between different air pressure values ​​within the use range of the pressure controller. The combination of pressure controllers with different air pressure control ranges can also expand the air pressure adjustment range of the pressure controller that uses a certain air pressure adjustment range alone.

[0064] In some embodiments of the present disclosure, the target air pressure includes at least three sub-target air pressures, and the at least three sub-target air pressures are in a step relationship; after S6, it also includes: repeating steps S2~S4 and / or S5~S6 to quickly and stably inflate the filling chamber 6 to the sub-target air pressure in sequence.

[0065] The method for performing air pressure step control by the high-speed and high-precision air pressure control system disclosed in the present invention is as follows: Figure 6As shown, close all the solenoid valves 51 and the pressure relief valve 52, open the gas source 1, the filter 2, and the pressure controller 3; set the pre-adjusted air pressure in multiple air supply passages, and fill the air storage device 4 in each air supply passage to the corresponding pre-adjusted air pressure. Open all the solenoid valves 51 in the first air supply passage, and set the air pressure of the pressure controller 3 to the target air pressure or the second pre-adjusted air pressure. Then determine whether to step forward. If so, close all the solenoid valves 51 in the first air supply passage, and switch to the second air supply passage to adjust the air pressure. The adjustment process is similar to the adjustment process of the first air supply passage; if not, determine whether to change the target air pressure. If so, return to the aforementioned step of resetting the pre-adjusted air pressure. If not, determine whether to continue to operate under the current pressure. If so, continue to maintain the pressure without performing any operation. If not, close all the solenoid valves 51, open the pressure relief valve 52, and the control process ends.

[0066] The air pressure control system disclosed in the present invention uses the control logic of multiple air supply paths in parallel, which is more efficient and convenient than single-path regulation. It can realize step-by-step switching between different air pressures, reduce the internal pressure difference of the pipeline caused by air pressure switching, and effectively reduce the air pressure fluctuation in the filling chamber caused by air pressure switching.

[0067] The present disclosure is further described below through specific implementation methods. The above-mentioned high-speed and high-precision air pressure control system and control method are specifically described in the following embodiments. However, the following embodiments are only used to illustrate the present disclosure, and the scope of the present disclosure is not limited thereto.

[0068] Example 1

[0069] The structure diagram of the high-speed and high-precision air pressure control system of this embodiment 1 is as follows Figure 1 As shown, it includes two air supply passages, the target filling chamber volume is 66mm×73mm×15.5mm, the first target air pressure is 5kPa, and the air pressure of the pressure controller 3 is set through the PC end. The air pressure of the pressure controller 3 in one of the air supply passages is set to 5.4kPa, that is, a small air pressure increment is added on the basis of the first target air pressure of the filling chamber 6. This increment is obtained through experimental exploration. Different target air pressures have different air pressure increments, and the air pressure increment is the first overshoot. The pressure controller 3 of the other air supply passage can also take similar operations, that is, initially the pressure controller 3 sets a pressure value slightly larger than the second target air pressure of the filling chamber 6.

[0070] After the gas pressure of the gas storage device 4 reaches 5.4kPa, all preparations are ready. The regulating solenoid valve island 5 is opened first, and then switched to 5.0XkPa after 10ms. At this time, the pressure controller 3 is 0.0XkPa higher than the target pressure by the second overshoot, and 10ms is the first overshoot time. Usually, the second overshoot is much smaller than the first overshoot. Among them, the first overshoot, the second overshoot and the first overshoot time are all determined through experiments.

[0071] The whole process records the air pressure value in the filling chamber 6 through the pressure sensor 7, such as Figure 7 As shown, the air control system disclosed in the present invention realizes precise air control, with an air control accuracy within 10Pa. After the air pressure is switched, the time required to stabilize at the target air pressure is within 100ms.

[0072] Here, the air pressure of the air storage device 4 can also be directly set to 5.4 kPa. After all preparations are ready, the solenoid valve island 5 is opened and regulated first. At the same time, the pressure controller 3 controls the air pressure of the air storage device to 5.0 kPa, which can also quickly make the filling chamber 6 reach the first target air pressure.

[0073] Comparative Example 1

[0074] The difference between the air pressure control system of this comparative example and Example 1 is that an air storage device 4 is provided at the rear end of the pressure controller 3, but the air pressure in the air storage device 4 is set to a value that is too large in increment. For example, if the target air pressure of the filling chamber 6 is 5 kPa, the air pressure set by the pressure controller 3 and the air pressure in the air storage device 4 are 6 kPa. During the switching process of the air pressure, the air pressure value inside the filling chamber 6 will fluctuate to a large extent. The air control curve is as follows: Figure 8 shown.

[0075] Comparative Example 2

[0076] The difference between the air pressure control system of this comparative example and Example 1 is that the air storage device 4 is not provided at the rear end of the pressure controller 3. Based on the characteristics of the proportional relief valve 31 itself, the air pressure switching process will have a fast jump stage and a slow adjacent stage, which will result in a longer air pressure switching process time. The air control curve is as follows: Fig. 9 shown.

[0077] Comparative Example 3

[0078] The difference between the air pressure control system of this comparative example and Example 1 is that an air storage device 4 is provided at the rear end of the pressure controller 3, but the air pressure in the air storage device 4 is not set to increase. For example, if the target air pressure of the filling chamber 6 is 5 kPa, the air pressure set by the pressure controller 3 and the air pressure in the air storage device 4 are also 5 kPa. Fig. 9 Similar, but the control time is relative to Fig. 9 It will be slightly shorter.

[0079] It can be seen that conventional air control methods may have problems such as excessive adjustment and unstable fluctuations, or low filling efficiency. In order to achieve high-precision target air pressure, the control time requires at least 1.98s. The control time of the high-speed and high-precision air pressure control system disclosed in the present invention is greatly shortened compared to the control time of conventional air control methods.

[0080] Example 2

[0081] The structure diagram of the high-speed and high-precision air pressure control system of this embodiment 2 is as follows Figure 2 As shown, it includes three air supply paths, the target filling chamber volume is 66mm×73mm×15.5mm, the target air pressure includes three sub-target air pressures, and the three sub-target air pressures are in a step relationship, namely 5kPa, 10kPa, and 15kPa. The control method is as follows:

[0082] (1) Open the gas source 1 to provide gas to the three gas supply paths, close the pressure relief valve 52 and all solenoid valves 51, and open all filters 2 and pressure controllers 3.

[0083] (2) The air pressure of the pressure controller 3 in the first air supply passage is set to 5.4 kPa through the PC. After the air pressure of the air storage device 4 reaches 5.4 kPa, the regulating solenoid valve island 5 in the first air supply passage is opened. After 10 ms, the air pressure value of the pressure controller 3 is reduced to the sum of the first sub-target air pressure and the second overshoot, and the filling chamber 6 quickly and stably reaches the first sub-target air pressure.

[0084] (3) The air pressure of the pressure controller 3 in the second air supply passage is set to 10.35 kPa through the PC. After the air pressure of the air storage device 4 reaches 10.35 kPa, the regulating solenoid valve island 5 in the second air supply passage is opened. After 10 ms, the air pressure value of the pressure controller 3 is reduced to the sum of the second sub-target air pressure and the second overshoot, and the filling chamber 6 quickly and stably reaches the second sub-target air pressure.

[0085] (4) The air pressure of the pressure controller 3 in the third air supply passage is set to 15.2 kPa through the PC. After the air pressure of the air storage device 4 reaches 15.2 kPa, the regulating solenoid valve island 5 in the third air supply passage is opened. After 10 ms, the air pressure value of the pressure controller 3 is reduced to the sum of the third sub-target air pressure and the second overshoot, and the filling chamber 6 quickly and stably reaches the third sub-target air pressure.

[0086] The whole process records the air pressure value in the filling chamber 6 through the pressure sensor 7, such as Fig.10 As shown, the air control system disclosed in the present invention can achieve step-by-step precision air control between 5kPa, 10kPa, and 15kPa. During the air pressure switching process, the air pressure jitter is within 10Pa, and the time required to stabilize at the target air pressure is within 100ms.

[0087] The above embodiment only schematically illustrates the method of step-by-step pressure control in the filling chamber 6. In actual use, the three pressure values ​​can be switched arbitrarily with each other. In addition, the three air supply passages do not only reach the first pre-adjusted air pressure of the air storage device 4 in chronological order, but also can adjust the first pre-adjusted air pressure of each air supply passage at the same time under the premise of closing the regulating solenoid valve island. After the air storage devices of each air supply passage reach the first pre-adjusted air pressure, the regulating solenoid valve island 5 of the corresponding air supply passage is opened according to the air pressure requirement of the filling chamber 6. In addition, the first target air pressure of each air supply passage is not fixed. If the air pressure requirement of the filling chamber 6 cannot be met in all existing air supply passages, the first target air pressure of the air supply passage can be changed by adjusting the pressure controller 3 of the air supply passage that is not in use.

[0088] In summary, the high-speed and high-precision air pressure control system and control method disclosed in the present invention, through the optimized arrangement of the gas storage device, greatly reduces the gas transmission rate loss caused by factors such as gas source arrangement, pipeline consumption, flow limitation, etc.; through the proportional overflow principle of the pressure controller, the air pressure signal is converted into displacement, force, and current signals to achieve a more convenient and precise air control effect, and in combination with the gas storage device, the leakage rate caused by the sealing problem is effectively compensated; through the control logic of multiple gas supply passages in parallel, step switching between different air pressures is realized, and the target chamber air pressure fluctuation caused by switching is reduced; the PID algorithm is used to optimize the switching pre-filling and pressure stabilization strategy, and achieves air pressure control performance that takes into account high speed, high precision, and high stability.

[0089] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations and / or combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways without departing from the spirit and teachings of the present disclosure. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0090] Although the present disclosure has been shown and described with reference to specific exemplary embodiments of the present disclosure, it should be understood by those skilled in the art that various changes in form and details may be made to the present disclosure without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Therefore, the scope of the present disclosure should not be limited to the above-mentioned embodiments, but should be determined not only by the appended claims, but also by the equivalents of the appended claims.

Claims

1. A high-speed and high-precision air pressure control system, characterized in that: include: Gas source (1); At least two air supply passages, the air supply passages are connected in parallel, and each of the air supply passages includes: A pressure controller (3) comprising a proportional relief valve (31) for controlling the air pressure of the corresponding air supply passage; An air storage device (4) for storing air to pre-adjust the air pressure of the corresponding air supply passage; A regulating solenoid valve island (5) comprising at least one solenoid valve (51) for injecting gas into the filling chamber (6) to regulate the gas pressure of the filling chamber (6); Filling the chamber (6); A pressure sensor (7) is used to feed back the air pressure of the filling chamber (6) to the pressure controller (3).

2. The high-speed and high-precision air pressure control system according to claim 1, characterized in that: The gas storage device (4) is in communication with the pressure controller (3); The pressure controller (3) is used to control the air pressure of the air storage device (4).

3. The high-speed and high-precision air pressure control system according to claim 1, characterized in that: The number of the solenoid valves (51) in the regulating solenoid valve island (5) is an even number.

4. The high-speed and high-precision air pressure control system according to claim 1, characterized in that: The number of the solenoid valves (51) in the regulating solenoid valve island (5) is four.

5. The high-speed and high-precision air pressure control system according to claim 1, characterized in that: Each of the air supply passages further comprises: A filter (2), located before the pressure controller (3), for filtering the gas provided by the gas source (1); A pressure relief valve (52) is located between the regulating solenoid valve island (5) and the filling chamber (6) and is used to relieve pressure in the filling chamber (6).

6. A control method for a high-speed and high-precision air pressure control system according to any one of claims 1 to 5, characterized in that: include: S1, obtaining a first target air pressure, closing all solenoid valves (51) in a first air supply passage, and opening an air source (1) and a pressure controller (3) in the first air supply passage; S2, according to the first target air pressure, using a pressure controller (3) in the first air supply passage to control an air storage device (4) in the first air supply passage to a first pre-adjusted air pressure; wherein the first pre-adjusted air pressure has a first overshoot relative to the first target air pressure; S3, opening all the solenoid valves (51) in the first air supply passage to quickly and stably inflate the filling chamber (6) to the first target air pressure.

7. The control method of the high-speed and high-precision air pressure control system according to claim 6, characterized in that: The S3 further includes: All the solenoid valves (51) in the first air supply passage are opened, and after a first overshoot time, a pressure controller (3) in the first air supply passage is used to control the air storage device (4) in the first air supply passage to a second pre-adjusted air pressure; wherein the second pre-adjusted air pressure has a second overshoot relative to the first target air pressure, and the second overshoot is less than the first overshoot.

8. The control method of the high-speed and high-precision air pressure control system according to claim 6, characterized in that: The S1 includes obtaining a second target air pressure; The S2 further includes: According to the second target air pressure, a pressure controller (3) in the second air supply passage is used to control the air storage device (4) in the second air supply passage to a third pre-adjusted air pressure; wherein the third pre-adjusted air pressure has a third overshoot relative to the second target air pressure; The S3 also includes: S4, closing all the solenoid valves (51) in the first air supply passage, opening all the solenoid valves (51) in the second air supply passage, and rapidly and stably inflating the filling chamber (6) to the second target air pressure.

9. The control method of the high-speed and high-precision air pressure control system according to claim 6, characterized in that: The S1 includes obtaining a second target air pressure; The S3 also includes: S5, according to the second target air pressure, using a pressure controller (3) in the second air supply passage to control the air storage device (4) in the second air supply passage to a third pre-adjusted air pressure; wherein the third pre-adjusted air pressure has a third overshoot relative to the second target air pressure; S6, closing all the solenoid valves (51) in the first air supply passage, opening all the solenoid valves (51) in the second air supply passage, and rapidly and stably inflating the filling chamber (6) to the second target air pressure.

10. The control method of the high-speed and high-precision air pressure control system according to claim 9, characterized in that: The target air pressure includes at least three sub-target air pressures, and the at least three sub-target air pressures are in a step relationship; The S6 also includes: Repeat steps S2 to S4 and / or S5 to S6 to sequentially and rapidly and stably inflate the filling chamber (6) to the sub-target air pressure.

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