CN2581696Y - Electrohydraulic servo-controlling system - Google Patents
Electrohydraulic servo-controlling system Download PDFInfo
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- CN2581696Y CN2581696Y CN 02205454 CN02205454U CN2581696Y CN 2581696 Y CN2581696 Y CN 2581696Y CN 02205454 CN02205454 CN 02205454 CN 02205454 U CN02205454 U CN 02205454U CN 2581696 Y CN2581696 Y CN 2581696Y
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- oil engine
- regulator
- converter
- electrohydraulic servo
- lvdt
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- 230000003412 degenerative effect Effects 0.000 claims description 9
- 239000011230 binding agent Substances 0.000 claims description 3
- 230000008450 motivation Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 230000001276 controlling effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 238000004377 microelectronic Methods 0.000 abstract description 2
- 230000005662 electromechanics Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 22
- 230000003068 static effect Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000009711 regulatory function Effects 0.000 description 2
- 206010021703 Indifference Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010723 turbine oil Substances 0.000 description 1
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Abstract
The utility model relates to a novel electrohydraulic servo control system, and belongs to steam turbine electrohydraulic servo control equipment adopting microelectronic technique to combine with electromechanics. The utility model is suitable for controlling and regulating the opening extent of a gad inlet valve of a steam turbine. The utility model is characterized in that a signal inner ring local negative feedback channel of an oil motor stroke LVDT is added behind a PI regulator in a voltage-position servo control loop of the system, and the PI regulator can be controlled by an artificial circuit and can be also controlled by an upper position machine. In a DDV valve system which is adopted, the utility model can utilize a DDV valve to accomplish LVDT local negative feedback. Accordingly, a special servo unit is canceled. The utility model simultaneously achieves the regulating stability and the no difference effect, and in the system where the PI regulator is controlled by the upper position machine, an electrohydraulic servo controller is a universal plate. The equipment versatility is high. And the cost is reduced.
Description
Technical field
The utility model belongs to the steam turbine electro-hydraulic servo control equipment that adopts microelectronic technology, dynamo-electric combination, is suitable for controlling the admission valve aperture of adjusting steam turbine.
Background technique
Electro-hydraulic servo control device in the digital electro-hydraulic control system adopts the traveled distance signal of analog circut realization valve setting signal and oil engine comprehensively relatively to proofread and correct amplification usually.The mode that employing ratio is in the past regulated, stability better have static difference but adjust the result.The mode that adopts PI to regulate can be eliminated static difference, but because different hydraulic systems requires the PI parameter variation range very big, is difficult to adapt to the requirement of numerous controlling object dynamic characteristics, and especially the PI parameter is difficult to adjust in the turbine oil system.Above-mentioned in addition electro-hydraulic servo control device need be developed special-purpose shaping board, and workload is big, and consumption is little, the cost height.
Summary of the invention
The utility model is exactly to solve the problem that above-mentioned prior art exists, and a kind of novel electrohydraulic servo-controlling system is provided, and its electro-hydraulic servo control device good stability can be eliminated static difference, and highly versatile.
General electrohydraulic servo-controlling system, comprise by D/A converter, pi regulator, power amplifier, electro-control converter, oil engine and connecting in turn, and be arranged between oil engine and the pi regulator can be with the signal feed back of the oil engine traveled distance oil engine stroke transmitter to pi regulator, the voltage of being formed-position follower control loop, oil engine stroke transmitter is generally linear variable differential transformer (LVDT) (hereinafter to be referred as LVDT).Structure characteristic of the present utility model is: increase the local reverse feedback of ring in the oil engine stroke LVDT signal in above-mentioned voltage-position follower control loop, promptly, in this control loop, set up again by the oil engine traveled distance signal negative feedback channel of oil engine stroke transmitter to power amplifying part, pi regulator is controlled by analog circut after can being connected D/A converter, also can be connected D/A converter and be controlled by upper-position unit before.Its structure is following several:
A, the local reverse feedback of ring in increase by the one road binders motivation stroke LVDT behind pi regulator, promptly, increase a signal reverse feedback line from oil engine stroke transmitter to power amplifier, when being input to pi regulator, oil engine stroke LVDT signal also delivers to the power amplifier that is connected on thereafter, other structure is constant in voltage-position follower control loop, constitutes PI thus and regulates the local degenerative electrohydraulic servo-controlling system of ring in the band that is controlled by analog circut.
B, also pi regulator can be placed before the D/A converter, be controlled by upper-position unit, and between oil engine stroke transmitter and pi regulator, set up A/D converter, oil engine stroke LVDT signal is imported pi regulator through A/D converter, deliver to the power amplifier that is connected on after the D/A converter simultaneously and form local reverse feedback, all the other structures are described identical with a, constitute thus PI regulate be controlled by upper-position unit, the local degenerative electrohydraulic servo-controlling system of ring in the band.
C, can also adopt the DDV valve to replace power amplifier and electro-control converter in primary voltage-position follower control loop, in the time of oil engine stroke LVDT signal input pi regulator, the power amplifier of also directly delivering to DDV valve inside forms local reverse feedback, all the other structures are described identical with b, constitute the PI adjusting thus and are controlled by upper-position unit, cancellation dedicated servo unit, the local degenerative electrohydraulic servo-controlling system of the interior ring of band.
Structure a and b are applicable to and adopt in the system of nozzle baffle formula valve as electro-control converter that structure c is applicable to and adopts in the system of DDV valve as electro-control converter.
Major advantage of the present utility model is: 1. owing to set up the local reverse feedback of ring in the oil engine stroke LVDT, transform the oil engine of integral element as inertial element, thereby make electrohydraulic servo system reach employing ratio stability of regulating and the indifference effect that adopts PI to regulate simultaneously; 2. PI is regulated and include in the control logic of upper-position unit, adopt the configuration mode realization PI regulatory function general with decentralized control system (DCS), can make parameter adjustment convenient, and this mode cancels electro-hydraulic servo control device special-purpose plate, made product cost reduce; 3. can utilize the DDV valve to realize the local reverse feedback of LVDT, and the DDV valve can adapt to high-pressure system and also can be used for low service system, versatility is stronger.
Description of drawings:
Fig. 1 is the steam turbine electrohydraulic servo-controlling system structured flowchart before improving.
Fig. 2, Fig. 3, Fig. 4 are respectively the utility model embodiment 1,2,3 electrohydraulic servo-controlling system structured flowcharts.
Fig. 5 is the utility model pi regulator and power amplifier circuit schematic diagram.
Embodiment: embodiment 1:
Referring to Fig. 2, Fig. 5, increase the local reverse feedback of ring in the road binders motivation stroke LVDT after the pi regulator 2 in existing voltage-position follower control loop, oil engine stroke LVDT signal is input to pi regulator 2, also deliver to the power amplifier 3 that is connected on thereafter simultaneously, other structure of control loop is constant, constitute thus PI regulate be controlled by analog circut, the local degenerative electrohydraulic servo-controlling system of ring in the band.The structure of described pi regulator 2 and power amplifier 3 circuit is: the operational amplifier U1-B that setting can compare valve setting signal and oil engine stroke LVDT signal, can carry out the operational amplifier U1-A that ratio is amplified, can finish the operational amplifier U2-B of comprehensive computing, and power amplifier U3, above-mentioned each circuit connects step by step, between operational amplifier U1-A and U2-B, be connected to jumper JP2, at the oil engine stroke LVDT of operational amplifier U1-B signal input an input end that has the local reverse feedback line of the interior ring X1 of jumper JP1 to operational amplifier U2-B is set, output terminal at operational amplifier U1-B also is connected to potentiometer R16, the input end that can carry out the operational amplifier U2-A of integral operation is connected to three jumper JP4, JP5, the branch road of JP6 parallel connection, this branch road and potentiometer R16 join, and the output terminal of operational amplifier U2-A joins through the input end of jumper JP3 and operational amplifier U2-B.
Scale operation, integral operation, the local reverse feedback of interior ring jumper JP2, JP3, the JP1 through connecting separately respectively insert comprehensive operational amplifier, can select whether to insert above-mentioned each circuit as required, make more convenient to operate flexible, in addition, jumper selectable JP4～JP6, and adjust potentiometer R16, can change intergration time on a large scale.Operational amplifier U1 in the present embodiment, U2 adopts TLE20241DW cake core, power amplification U3 BUF634-D1P8 cake core.
Embodiment 2:
Referring to Fig. 3, on embodiment 1 basis, pi regulator 2 is placed before the D/A converter (analog amount output board) 1, include in the control logic of upper-position unit, adopt the configuration mode realization PI regulatory function general with the DCS system, between oil engine stroke transmitter 6 and pi regulator 2, set up A/D converter (analog amount tablet) 7, oil engine stroke LVDT signal is through A/D converter (analog amount tablet) 7 input pi regulators 2, deliver to simultaneously and be connected on D/A converter (analog amount output board) 1 power amplifier 3 afterwards, all the other structures are identical with embodiment 1, constitute PI thus and regulate and to be controlled by upper-position unit, the local degenerative electrohydraulic servo-controlling system of ring in the band.
Embodiment 3:
Referring to Fig. 4, the power amplifier 3 and the electro-control converter 4 that adopt DDV valve 8 to replace in primary voltage-position follower control loop, in the time of oil engine stroke LVDT signal input pi regulator 2, also directly deliver to the power amplifier of DDV valve 8 inside, all the other structures are identical with embodiment 2, constitute PI thus and regulate and to be controlled by upper-position unit, cancellation digital electro-hydraulic control system (DEH) dedicated servo unit utilizes the DDV valve to realize the local degenerative electrohydraulic servo-controlling system of LVDT.
In described structure is that PI regulates D/A converter, the A/D converter in the electrohydraulic servo-controlling system that is controlled by upper-position unit, is respectively standard analog amount output board, the analog amount tablet that adapts with upper computer control system.It among the embodiment 2,3 of the present utility model the analog amount output/tablet (commercially available product) that adopts DCS system standard.
Claims (5)
1. novel electrohydraulic servo-controlling system, comprise by D/A converter, pi regulator, power amplifier, electro-control converter, oil engine connects in turn, and be arranged between oil engine and the pi regulator can be with the signal feed back of the oil engine traveled distance oil engine stroke transmitter to pi regulator, the voltage of being formed---position follower control loop, oil engine stroke transmitter is generally linear variable differential transformer (LVDT) (hereinafter to be referred as LVDT), it is characterized in that: at above-mentioned voltage---increase the local reverse feedback of ring in the oil engine stroke LVDT signal in the position follower control loop, promptly, in this control loop, set up again by the oil engine traveled distance signal negative feedback channel of oil engine stroke transmitter to power amplifying part, pi regulator is controlled by analog circut after can being connected D/A converter, also can be connected D/A converter and be controlled by upper-position unit before.
2. novel electrohydraulic servo-controlling system according to claim 1, it is characterized in that described at voltage---increase the local reverse feedback of ring in the oil engine stroke LVDT signal in the position follower control loop, its structure can increase the local reverse feedback of ring in the road binders motivation stroke LVDT behind pi regulator, promptly, increase a signal reverse feedback line from oil engine stroke transmitter to power amplifier, when being input to pi regulator, oil engine stroke LVDT signal also delivers to the power amplifier that is connected on thereafter, voltage---other structure is constant in the position follower control loop, constitutes PI thus and regulates and to be controlled by analog circut, the local degenerative electrohydraulic servo-controlling system of ring in the band.
3. novel electrohydraulic servo-controlling system according to claim 1, it is characterized in that described at voltage---increase the local reverse feedback of ring in the oil engine stroke LVDT signal in the position follower control loop, its structure also can place pi regulator before the D/A converter, be controlled by upper-position unit, and between oil engine stroke transmitter and pi regulator, set up A/D converter, oil engine stroke LVDT signal is imported pi regulator through A/D converter, deliver to the power amplifier that is connected on after the D/A converter simultaneously and form local reverse feedback, all the other structures are described identical with claim 2, constitute PI thus and regulate and to be controlled by upper-position unit, the local degenerative electrohydraulic servo-controlling system of ring in the band; Can also adopt the DDV valve to replace primary voltage---power amplifier and electro-control converter in the position follower control loop, in the time of oil engine stroke LVDT signal input pi regulator, the power amplifier of also directly delivering to DDV valve inside forms local reverse feedback, all the other structures are identical with the above, constitute thus PI regulate the cancellation dedicated servo unit be controlled by upper-position unit, the local degenerative electrohydraulic servo-controlling system of ring in the band.
4. according to claim 1 or 3 described novel electrohydraulic servo-controlling systems, it is characterized in that: in described structure is that PI regulates D/A converter, the A/D converter in the electrohydraulic servo-controlling system that is controlled by upper-position unit, is respectively standard analog amount output board, the analog amount tablet that adapts with upper computer control system.
5. novel electrohydraulic servo-controlling system according to claim 1, the structure that it is characterized in that described pi regulator and power amplifier circuit is: the operational amplifier (U1-B) that setting can compare valve setting signal and oil engine stroke LVDT signal, can carry out the operational amplifier (U1-A) that ratio is amplified, can finish the operational amplifier (U2-B) of comprehensive computing, and power amplifier (U3), above-mentioned each circuit connects step by step, be connected to jumper (JP2) at operational amplifier (U1-A) and (U2-B), at the oil engine stroke LVDT of operational amplifier (U1-B) signal input an input end that has the local reverse feedback line of interior ring (X1) of jumper (JP1) to operational amplifier (U2-B) is set, output terminal at operational amplifier (U1-B) also is connected to potentiometer (R16), the input end that can carry out the operational amplifier (U2-A) of integral operation is connected to three jumper (JP4, JP5, JP6) Bing Lian branch road, this branch road and potentiometer (R16) join, and the output terminal of operational amplifier (U2-A) joins through the input end of jumper (JP3) with operational amplifier (U2-B).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02205454 CN2581696Y (en) | 2002-02-22 | 2002-02-22 | Electrohydraulic servo-controlling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02205454 CN2581696Y (en) | 2002-02-22 | 2002-02-22 | Electrohydraulic servo-controlling system |
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| CN2581696Y true CN2581696Y (en) | 2003-10-22 |
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| CN 02205454 Expired - Fee Related CN2581696Y (en) | 2002-02-22 | 2002-02-22 | Electrohydraulic servo-controlling system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360177A (en) * | 2011-09-15 | 2012-02-22 | 江苏科技大学 | Electro-hydraulic linear speed servo system |
| CN103904650A (en) * | 2014-04-14 | 2014-07-02 | 重庆浦仁达科技有限公司 | Digital-analog combined electrohydraulic control system |
| CN106054592A (en) * | 2016-08-01 | 2016-10-26 | 江苏科技大学 | Electrohydraulic position servo controller |
| CN110799444A (en) * | 2017-06-29 | 2020-02-14 | 米其林集团总公司 | Control system for an automatic fork-lift truck and method for operating such a truck |
| CN112214041A (en) * | 2020-10-23 | 2021-01-12 | 福建省鸿山热电有限责任公司 | Closed-loop control device and method for valve position of hydraulic regulating valve |
-
2002
- 2002-02-22 CN CN 02205454 patent/CN2581696Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360177A (en) * | 2011-09-15 | 2012-02-22 | 江苏科技大学 | Electro-hydraulic linear speed servo system |
| CN102360177B (en) * | 2011-09-15 | 2013-05-15 | 江苏科技大学 | Electro-hydraulic linear speed servo system |
| CN103904650A (en) * | 2014-04-14 | 2014-07-02 | 重庆浦仁达科技有限公司 | Digital-analog combined electrohydraulic control system |
| CN106054592A (en) * | 2016-08-01 | 2016-10-26 | 江苏科技大学 | Electrohydraulic position servo controller |
| CN110799444A (en) * | 2017-06-29 | 2020-02-14 | 米其林集团总公司 | Control system for an automatic fork-lift truck and method for operating such a truck |
| CN110799444B (en) * | 2017-06-29 | 2021-03-23 | 米其林集团总公司 | Control system for an automatic fork-lift truck and method for operating such a truck |
| CN112214041A (en) * | 2020-10-23 | 2021-01-12 | 福建省鸿山热电有限责任公司 | Closed-loop control device and method for valve position of hydraulic regulating valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Designer after: Liu Kangning Designer after: Luo Zuozhen Designer before: Guo Min Designer before: Zhang Xiaohui |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: DESIGNER; FROM: GUO MIN; ZHANG XIAOHUI TO: LIU KANGNING; LUO ZUOZHEN |
|
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Li Jinglong Document name: Notification of Termination of Patent Right |
|
| C56 | Change in the name or address of the patentee |
Owner name: BEIJING HELISHI SYSTEM ENGINEERING CORPORATION Free format text: FORMER NAME OR ADDRESS: BEIJING HELISHI SYSTEM ENGINEERING CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: No. 10, city road, building materials, Haidian, Beijing, Xisanqi: 100096 Patentee after: Beijing HollySys System Engineering Co., Ltd. Address before: No. 10, city road, building materials, Haidian, Beijing, Xisanqi: 100096 Patentee before: Beijing HollySys System Engineering Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20031022 Termination date: 20110222 |