CN204828865U - Pneumatic proportional valve system based on switch tactics - Google Patents
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Abstract
The utility model relates to a pneumatic proportional valve system based on switch tactics, the air is divided into two parts, most target pressure that becomes, the gaseous prestage that gets into of fraction through the sprue after the reposition of redundant personnel behind sprue throttle mouth, the prestage comprises two high -speed solenoid valve and a control cavity, two high -speed solenoid valve play the effect of inflating and exitting for the cavity respectively, utilize on -off control tactfully, control module understands output signal, control high -speed solenoid valve's switch. Being greater than target pressure when the pressure that effluents, opening upper reaches high -speed solenoid valve, close low reaches high -speed solenoid valve, cavity overpressure, actuating strut are overcome the spring force and are moved down, reach the balance in certain position to the pressure that effluents has been reduced. Xiang fan the pressure that risees and effluent. Certainly, accomplish the spring that suitable spring coefficient must be selected to this process, outflowing port's pressure sensor obtains outflowing port's pressure signal, feeds back to the controller to form the closed loop.
Description
Technical field
The utility model relates to a kind of pneumatic proportional valve system based on switching strategy and controlling method thereof, belongs to pneumatic amplifier element technical field.
Background technique
Nonlinear dynamical model based on the Lucifer-typeEPP3J-21-U-100-10 type valve of Honeywell has carried out analyzing and has done experiment test.This valve utilizes and carries out PWM control to high-speed electromagnetic valve.Author utilizes the Verification of the experiment acquisition correctness of mathematical model, and this model can apply to the structural design of similar valve; Lv Tao devises a kind of electric proportional pressure valve based on piezoelectric proportional valve in " piezo electric valve design and the application study in train braking system thereof " literary composition.This valve utilizes piezoelectric proportional valve as the first guide cavity of pilot stage proportional control, then changes sprue aperture by first guide cavity, thus reaches the object of proportion adjustment.Experimentally result, its self-control piezoelectric valve performance response speed known, the linearity is better, but there is dead band, and input air pressure is very low and follow the tracks of the shortcoming of jump signal poor-performing.
BaoGang, ChengTinghai, HuangYao, GuoXiangdong, Gao devise a kind of nozzle baffle type electro-pneumatic proportional pressure valve driven by piezoelectric motors in Han.ANozzleFlapperElectro-PneumaticProportionalPressureV alveDrivenbyPiezoelectricMotor mono-literary composition.The piezoelectric motors of this valve change the aperture of nozzle flapper, thus control the pilot pressure of pilot stage, and then change the aperture of sprue, to reach the object of proportion adjustment.The linearity of this valve under certain working pressure be ± 5%, and degree of separation is 0.1%, and delayed is ± 0.5%, compares common Proportional valve and has good stability and control accuracy.
Utilize high-speed electromagnetic valve to carry out Stress control to the prestage of valve, thus change sprue aperture reach proportion adjustment object.The a lot of researchs relating to high-speed electromagnetic valve at present utilize PWM control strategy substantially, but PWM controls there is following harmful effect to control accuracy:
1) switch motion produces flow pulsation, has impact to Systematical control precision;
2) the switching over characteristic of valve can form zero-bit dead band.
Model utility content
For the deficiency of above-mentioned background technology, the utility model utilizes simple switch control strategy to control high-speed electromagnetic valve, changes prestage pressure, provides a kind of pneumatic proportional valve system based on switching strategy and controlling method thereof.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
Based on a pneumatic proportional valve system for switching strategy, comprise primary valve part, prestage control section and singlechip control part; Wherein, described primary valve part comprises air sprue and the main control valve be connected successively, elastic member; Described prestage control section comprises air flow road, at least two high-speed electromagnetic valves, connecting tube and pressure transducers, described air sprue connects air flow road, connects main control valve and pressure transducer successively in the outlet port of air sprue; Described air flow road sets gradually high-speed electromagnetic valve, the air flow road between the first high-speed electromagnetic valve with the second high-speed electromagnetic valve is communicated with a pipeline; Described pipeline connects a cavity, is provided with an air bladder and action rod member in cavity successively, and the other end of action rod member is rigidly attached on main control valve, makes air bladder distortion pushing action rod member control the aperture of main control valve by the change of cavity internal air pressure; Described singlechip control part comprises single-chip microcomputer and motor drive module, described single-chip microcomputer goes out according to pressure transducer the switch that flowing pressure signal and artificial setting signal control the first high-speed electromagnetic valve and the second high-speed electromagnetic valve, thus change the size of cavity internal pressure, keep the balance of flowing pressure.
The end in described air flow road is leakage port.
Described single-chip microcomputer connects a display device, for display system state.
Based on a pneumatic proportional valve controlling method for switching strategy, the method comprises the following steps,
Step one, pressure transducer gathers the air pressure in the outlet port of air sprue, is entered on single-chip microcomputer, and judgement needs to reduce flowing pressure or raise out flowing pressure;
Step 2, single-chip microcomputer exports control signal, is controlled the on off state of high-speed electromagnetic valve by motor drive module, changes the air pressure size in cavity, is changed the aperture of main control valve by air bladder;
Step 3, when reaching control effects, closing high-speed solenoid valve.
Further, described step 2 specifically refers to, when needs reduce flowing pressure time, open the high-speed electromagnetic valve of cavity upstream, close the high-speed electromagnetic valve in cavity downstream; When needs raise out flowing pressure, close the high-speed electromagnetic valve of cavity upstream, open the high-speed electromagnetic valve in cavity downstream.
Further, described step one specifically refers to, arranges up-down error scope to goal pressure, i.e. the data and the upper margin of error that gather of comparative pressure sensor and lower margin of error, and when the data gathered are greater than upper margin of error, needs reduce and flowing pressure; When the data gathered are less than in lower margin of error, need to raise out flowing pressure.
Preferred as one, on the basis of described height margin of error, upper and lower transition range is set, namely transition range on is set at the lower limb of high level error scope, transition range is once set at the top edge of low margin of error; When the data of pressure transducer collection drop in upper and lower transition range, open two high-speed electromagnetic valves simultaneously and utilize the method for bangbang control and P control combination to control the opening time of two high-speed electromagnetic valves, avoid vibration.
The utility model adopts above technological scheme compared with prior art, has following technique effect:
This kind of pneumatic proportional valve system based on switching strategy and controlling method have the performance of precision height and fast response time, possess low cost, the features such as high reliability simultaneously:
1, precision is high: be that the error of principle arrangement can control within ± 15kPa;
2, fast response time: the speed of response of prestage is at about 50ms;
3, cost is low: high-speed electromagnetic valve etc. are cheap, and the cost of device entirety is lower.
Accompanying drawing explanation
The pneumatic proportional valve system model figure based on switching strategy that Fig. 1 provides for the utility model;
The pneumatic proportional valve controlling method schematic flow sheet based on switching strategy that Fig. 2 provides for the utility model;
The pneumatic proportional valve system pressure response curve based on switching strategy that Fig. 3 provides for the utility model;
The pneumatic proportional valve system based on switching strategy that Fig. 4 provides for the utility model goes out flowing pressure curve of error;
The control flow block diagram of a kind of mode of execution that Fig. 5 provides for the utility model;
Fig. 6 is that prestage that Fig. 5 is corresponding jumps signal response curve figure;
Fig. 7 is that prestage that Fig. 5 is corresponding jumps signal response curve figure;
The prestage that the second mode of execution that Fig. 8 provides for the utility model is corresponding jumps signal response curve figure;
The prestage that the second mode of execution that Fig. 9 provides for the utility model is corresponding jumps signal response curve figure;
The prestage that the second mode of execution that Figure 10 provides for the utility model is corresponding jumps signal response curve figure;
The prestage that the second mode of execution that Figure 11 provides for the utility model is corresponding jumps signal response curve figure;
Wherein, 1-first high-speed electromagnetic valve, 2-first high-speed electromagnetic valve, 3-main control valve, 4-action rod member, 5-cavity, 6-primary valve part, 7-prestage control section, 8-singlechip control part, 9-pressure transducer, 10-display device, 11-single-chip microcomputer.
Embodiment
The utility model provides a kind of pneumatic proportional valve system based on switching strategy and controlling method thereof, and for making the purpose of this utility model, technological scheme and effect clearly, clearly, and further describe the utility model with reference to accompanying drawing examples.Should be appreciated that concrete enforcement described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Be described in detail below in conjunction with the technological scheme of accompanying drawing to model utility:
The method provides a kind of pneumatic proportional valve system based on switching strategy as shown in Figure 1, and concrete structure is:
Based on a pneumatic proportional valve system for switching strategy, comprise primary valve part, prestage control section and singlechip control part; Wherein, described primary valve part comprises air sprue and the main control valve be connected successively, elastic member; Described prestage control section comprises air flow road, at least two high-speed electromagnetic valves, connecting tube and pressure transducers, described air sprue connects air flow road, connects main control valve and pressure transducer successively in the outlet port of air sprue; Described air flow road sets gradually high-speed electromagnetic valve, the air flow road between the first high-speed electromagnetic valve with the second high-speed electromagnetic valve is communicated with a pipeline; Described pipeline connects a cavity, is provided with an air bladder and action rod member in cavity successively, and the other end of action rod member is rigidly attached on main control valve, makes air bladder distortion pushing action rod member control the aperture of main control valve by the change of cavity internal air pressure; Described singlechip control part comprises single-chip microcomputer and motor drive module, described single-chip microcomputer goes out according to pressure transducer the switch that flowing pressure signal and artificial setting signal control the first high-speed electromagnetic valve and the second high-speed electromagnetic valve, thus change the size of cavity internal pressure, keep the balance of flowing pressure.This cavity is a cylinder, and the end in air flow road is leakage port, and described single-chip microcomputer connects a display device, for display system state.
From model, air is divided into two parts through sprue, and major part becomes goal pressure after sprue restriction, and small portion of gas enters prestage after shunting.Prestage controls cavity by two high-speed electromagnetic valves and one and forms.Two high-speed electromagnetic valves play a part to inflate to cavity and exit respectively, when needs reduce flowing pressure time, then need the pressure of sprue restriction to diminish, now need to improve and control the pressure of cavity and move downward to resist spring force.If utilize simple switch control strategy, control module can output signal, and opens upstream high-speed electromagnetic valve, the first high-speed electromagnetic valve namely in Fig. 1.Downstream high-speed electromagnetic valve, the second high-speed electromagnetic valve namely in Fig. 1 keeps closing.Now a part of air-flow of main flow can enter control cavity through upstream high-speed electromagnetic valve, and cavity pressure rises, and actuating strut overcomes spring force and moves down, and reaches balance in certain position, thus reduces out the pressure of stream.On the contrary, flowing pressure then need to open downstream high-speed electromagnetic valve to improve, close upstream high-speed electromagnetic valve.Certainly, the spring that this process must select suitable spring constant is completed.The pressure transducer going out head piece obtains out the pressure signal of head piece, feeds back to controller, thus forms closed loop control system.Complete control flow schematic diagram is as Fig. 2.
In the system that the utility model provides, the high-speed electromagnetic valve adopted is MAC35A-ACA-DDAA-1BA type high-speed electromagnetic valve, and the minimum opening time of this solenoid valve is 6ms, and the minimal closure time is 2ms.Cylinder, as the cavity in valve model, plays certain pressure stabilization function, in prestage, utilizes pressure transducer acquisition pressure wherein, and verifies correctness in kind by experiment.
The control of prestage plays conclusive effect at the control effects of native system; First, in order to the accuracy of principle and demonstration test result that the work of prestage control section is described, main valve control section is removed by we, separately test prestage control section.Adopt the air pressure in a pressure transducer detection cavity; Its concrete controlling method is:
Embodiment 1
Step one, pressure transducer gathers the air pressure in cavity, is entered on single-chip microcomputer, and judgement needs the air pressure reduced in cavity or the air pressure raised in cavity;
Step 2, single-chip microcomputer exports control signal, is controlled the on off state of high-speed electromagnetic valve by motor drive module, changes the air pressure size in cavity, is changed the aperture of main control valve by air bladder;
Step 3, when reaching control effects, closing high-speed solenoid valve.
We set a prestage cavity pressure allowed band, and namely gained press packet is containing an error band, when cavity pressure is less than error allowed band, then opens the first high-speed electromagnetic valve, closes the second high-speed electromagnetic valve, and cavity pressure rises; When cavity pressure is greater than error allowed band, then open the second high-speed electromagnetic valve valve, close the first high-speed electromagnetic valve, cavity pressure declines; When cavity pressure is in margin of error, two solenoid valves are all kept closed, and cavity pressure is constant.Concrete controller chassis as Fig. 5, its step respectively:
Step one, pressure transducer gathers the air pressure in cavity, be entered on single-chip microcomputer, to the air pressure in cavity, up-down error scope is set, the i.e. data that gather of comparative pressure sensor and upper margin of error and lower margin of error, when the data gathered are greater than upper margin of error, need to reduce the air pressure in cavity; When the data gathered are less than lower margin of error, need to raise the air pressure in cavity, judgement needs the air pressure reduced in cavity or the air pressure raised in cavity;
Step 2, single-chip microcomputer exports control signal, is controlled the on off state of high-speed electromagnetic valve by motor drive module; When needing to reduce the air pressure in cavity, opening the high-speed electromagnetic valve of upstream, closing the high-speed electromagnetic valve in downstream; When needing to raise the air pressure in cavity, closing the high-speed electromagnetic valve of upstream, opening the high-speed electromagnetic valve in downstream.
Step 3, when reaching control effects, closing high-speed solenoid valve.
The control to prestage cavity pressure is realized by this control strategy, arranging pressure EE Error Excepted is ± 15kPa, three groups of cavity pressure plotted curves as Fig. 6-Fig. 8 can be obtained, wherein all pressure is absolute pressure: the effect can seeing this control strategy from above-mentioned three suite line charts above: corresponding speed is very fast, precision is yet desirable at last, but it is unstable still to there is response, easily occurs oscillatory occurences.The appearance main cause of vibration is that flow is comparatively large, and high-speed electromagnetic valve opening time is limited to itself actuation time, and error band is less in addition, there will be the phenomenon of over inflation after hypotony, the excessive rear overgassing of pressure, causes vibration.So need to introduce the controlling method with transition.
Embodiment 2
On this basis, in order to ensure speed of response and respond effect more accurately faster, at error band lower edges, a transition zone is set respectively, when pressure falls into transition zone, obtain less flow switching time by opening two quick closing valves and change simultaneously, thus avoid vibration to occur.Its concrete steps are respectively:
Step one, pressure transducer gathers the air pressure in cavity, be entered on single-chip microcomputer, to the air pressure in cavity, height margin of error is set, the i.e. data that gather of comparative pressure sensor and high level error scope and low margin of error, when the data gathered are greater than high level error scope, need to reduce the air pressure in cavity; When the data gathered are less than high level error scope, need to raise the air pressure in cavity, judgement needs the air reduced in cavity or the air pressure raised in cavity;
Especially, on the basis of described height margin of error, upper and lower transition range is set, namely transition range on is set at the lower limb of high level error scope, transition range is once set at the top edge of low margin of error.
Step 2, single-chip microcomputer exports control signal, is controlled the on off state of high-speed electromagnetic valve by motor drive module; When needing to reduce the air pressure in cavity, opening the high-speed electromagnetic valve of upstream, closing the high-speed electromagnetic valve in downstream; When needing to raise the air pressure in cavity, closing the high-speed electromagnetic valve of upstream, opening the high-speed electromagnetic valve in downstream.When the data of pressure transducer collection drop in upper and lower transition range, open two high-speed electromagnetic valves simultaneously and utilize the method for bangbang control and P control combination to control the opening time of two high-speed electromagnetic valves, avoiding vibration.
Step 3, when reaching control effects, closing high-speed solenoid valve.
Empirical curve is as Fig. 8-Fig. 9.As can be seen from curve, the method that bangbang controls and P controls to combine avoids vibration, and greatly shortens step response time, and the response time is only 61ms and 57ms, which illustrates the good trace performance of prestage to goal pressure.The error band of curve is pressure all in force value ± 15kPa, figure is absolute pressure.Figure 10 is the response curve under chamber pressure stable state.Because device tightness problem causes pressure declining gradually, compensate to chamber pressure when dropping to quick closing valve work after outside margin of error.Curve shows, and prestage reaches steady-state behaviour requirement.
Above-mentioned experiment is all carried out under pressure error ± 15kPa.Pressure error is reduced into ± 5kPa, and utilize the switching time that in adjustment transition pressure range, two quick closing valves are different, obtain pressure response curve as shown in figure 11, control in conjunction with the P regulating and controlling valve switch time to be a good regulative mode by bangbang, prestage step response time at about 50ms, and can have good stability.
We are by primary valve part and the whole connecting system of load, and the air pressure in the outlet port of the air pressure air sprue of cavity mentioned above substituted, become complete Proportional valve system, then test, concrete grammar is:
Step one, pressure transducer gathers the air pressure in the outlet port of air sprue, is entered on single-chip microcomputer, and judgement needs to reduce flowing pressure or raise out flowing pressure; Arrange up-down error scope to goal pressure, i.e. the data and the upper margin of error that gather of comparative pressure sensor and lower margin of error, when the data gathered are greater than upper margin of error, needs reduce and flowing pressure; When the data gathered are less than lower margin of error, need to raise out flowing pressure.
Step 2, single-chip microcomputer exports control signal, is controlled the on off state of high-speed electromagnetic valve by motor drive module, changes the air pressure size in cavity, is changed the aperture of main control valve by air bladder;
Step 3, when reaching control effects, closing high-speed solenoid valve.
Upper and lower transition range be set in order to improve experimental precision and take the process of the control strategy corresponded to be the same with mentioned above, just repeating no more here.
Fig. 3 and Fig. 4 is the experiment effect after whole system adds loading condition, its design parameter is, set out stream goal pressure 0.121MPa step to 0.136MPa, bleed pressure is 0.6MPa, can obtain pressure diagram as shown in Figure 3, it goes out flowing pressure curve of error and is illustrated in fig. 4 shown below; Visible in about 4.5m appearance one decline sharply, be because be during this time applied with step signal to valve.By excellent steady-state behaviour and the dynamic performance that substantially can find out valve in figure.
Under stable state, mainly due to prestage tightness problem, prestage cavity pressure is caused to reduce gradually, the aperture of primary choke is diminished, goes out flowing pressure and reduce gradually, the aperture of primary choke is diminished, go out flowing pressure to reduce gradually, when dropping to outside error allowed band, controller can increase cavity pressure, makes to show that flowing pressure is got back within error allowed band.Result in formation of the curve of cyclical fluctuations under a stable state.Go out flowing pressure error under stable state and be no more than 3kPa.
Be understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and model utility design thereof and replace or change, and all these change or replace the protection domain that all should belong to the claim appended by the utility model.
Claims (3)
1. based on a pneumatic proportional valve system for switching strategy, it is characterized in that: comprise primary valve part, prestage control section and singlechip control part; Wherein, described primary valve part comprises air sprue and the main control valve be connected successively, elastic member; Described prestage control section comprises air flow road, at least two high-speed electromagnetic valves, connecting tube and pressure transducers, described air sprue connects air flow road, connects main control valve and pressure transducer successively in the outlet port of air sprue; Described air flow road sets gradually high-speed electromagnetic valve, the air flow road between the first high-speed electromagnetic valve with the second high-speed electromagnetic valve is communicated with a pipeline; Described pipeline connects a cavity, is provided with an air bladder and action rod member in cavity successively, and the other end of action rod member is rigidly attached on main control valve, makes air bladder distortion pushing action rod member control the aperture of main control valve by the change of cavity internal air pressure; Described singlechip control part comprises single-chip microcomputer and motor drive module, described single-chip microcomputer goes out according to pressure transducer the switch that flowing pressure signal and artificial setting signal control the first high-speed electromagnetic valve and the second high-speed electromagnetic valve, thus change the size of cavity internal pressure, keep the balance of flowing pressure.
2. a kind of pneumatic proportional valve system based on switching strategy according to claim 1, is characterized in that: the end in described air flow road is leakage port.
3. a kind of pneumatic proportional valve system based on switching strategy according to claim 1, is characterized in that: described single-chip microcomputer connects a display device, for display system state.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879551A (en) * | 2015-05-22 | 2015-09-02 | 南京航空航天大学 | Pneumatic proportional valve system based on switch strategy and control method thereof |
| CN109780299A (en) * | 2017-11-13 | 2019-05-21 | 新乡平原航空设备有限公司 | Double control solenoid valve and the vehicle for using the solenoid valve |
| CN114215926A (en) * | 2022-02-21 | 2022-03-22 | 广东永泉阀门科技有限公司 | Water attack-resistant micro-resistance type intelligent adjusting water pump control valve and control method thereof |
-
2015
- 2015-05-22 CN CN201520336742.1U patent/CN204828865U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879551A (en) * | 2015-05-22 | 2015-09-02 | 南京航空航天大学 | Pneumatic proportional valve system based on switch strategy and control method thereof |
| CN109780299A (en) * | 2017-11-13 | 2019-05-21 | 新乡平原航空设备有限公司 | Double control solenoid valve and the vehicle for using the solenoid valve |
| CN114215926A (en) * | 2022-02-21 | 2022-03-22 | 广东永泉阀门科技有限公司 | Water attack-resistant micro-resistance type intelligent adjusting water pump control valve and control method thereof |
| CN114215926B (en) * | 2022-02-21 | 2022-06-03 | 广东永泉阀门科技有限公司 | Control method of water attack-resistant micro-resistance type intelligent regulating water pump control valve |
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Granted publication date: 20151202 Termination date: 20180522 |