CN2871853Y - Valve-level controller - Google Patents
Valve-level controller Download PDFInfo
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- CN2871853Y CN2871853Y CN 200520077613 CN200520077613U CN2871853Y CN 2871853 Y CN2871853 Y CN 2871853Y CN 200520077613 CN200520077613 CN 200520077613 CN 200520077613 U CN200520077613 U CN 200520077613U CN 2871853 Y CN2871853 Y CN 2871853Y
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Abstract
The utility model relates to a control device used for an oil-driven machine valve position closed-loop in digital electro-hydraulic (DEH) system for steam turbine in fire power plate. The opening and closing of adjustment steam valve is to drive the linear variable differential transformers (LVDT) to move, the valve position controller is to provide LVDT with the alternate current (AC) excitation voltage after modulation and demodulation, the direct current (DC) voltage signal reflecting the opening degree of valve door is to be formed. By contrast with the valve position direction signal inputted by computer control system is calculated, eventually the oil-driven machine is driven by power amplification circuit, the valve position opening degree display of the valve position controller and the zero-position or full-position calibration of the feedback control are performed by the sliding of SCM digital potentiometer in microcomputer system, the valve position controller has RS232 communication interface and also can output long-distance display from the standardized current signal of the valve position opening degree to other system .
Description
Technical field
The utility model relates to a kind of device that is used for the closed loop control of power station digital electro-hydraulic control system (DEH) oil engine valve position.
Background technique
Digital electro-hydraulic control system (DEH) is the dedicated control system of Thermal Power Station's Turbo-generator Set, is the instrument of the startup of control steam turbine, shutdown and rotating speed control, power control, the control of drawing gas.It gathers the various status datas of steam turbine in real time, as hang lock, be incorporated into the power networks, jiggering, bypass, main vapour pressure, governing stage pressure, power, rotating speed, vacuum etc., and according to operations staff's operational order, carrying out logic judges and the PID computing, finally draw the position command of each valve, the control valve aperture is adjusted the steam flow enter steam turbine, thus the red switch of control Turbo-generator Set, be incorporated into the power networks, generate electricity, externally heat supply etc.
Digital electro-hydraulic control system is made up of the two large divisions, i.e. computer control part and Hydrauservo System.Computer control partly is the command center of control system, and Hydrauservo System (oil engine) is the actuator of control system.Realize the output signal of computer is gone to control opening and closing by the adjusting steam valve of hydraulic control, must automatical control system and hydraulic control system be connected by this isolated plant of valve positioner.
Valve positioner receives the valve location command signal of computer output, send a special-purpose driving current or voltage signal and deliver to servovalve on the oil engine and oil engine is produced move, the displacement of oil engine produces a valve position feedback signal to corresponding passage by the displacement transducer LVDT of installing.In valve positioner, given signal and feedback signal stack, to constant given signal, actuator's outgoing position is constant, and feedback signal also remains unchanged.When given signal change, the outgoing position of actuator changes the variation that causes valve position.The variation of valve position changes the feedback signal that LVDT measures, and feedback signal is compared with the valve position command signal, and when the two was equal when it, oil engine then was stabilized on a certain position, promptly reaches the reposition of given semaphore request.
The inner proportional integration of valve positioner (PI) is regulated, and can reach higher control accuracy.Valve positioner can show and the zero degree that feeds back, full scale are demarcated actuator's oil engine; simultaneously and the output normalized current signal that characterizes valve seat opening to other system (as DCS etc.); can be by regulating Dither to improve system sensitivity and to prevent to regulate the steam valve bite; current offset can be to the adjustment of setovering of the pilot valve zero-bit of oil engine; during Aided Machine is looked for; actuator closes when guaranteeing the valve positioner dead electricity simultaneously, with the protection steam turbine.
In at present all various domestic and imported valve positioner products, a kind of product adopts analog circut scheme completely, promptly all adopts analog circut such as operational amplifier to realize that the circuit more complicated of this product, reliability are slightly poor.
Summary of the invention
The utility model purpose is: provide a kind of and existing like product and compare, improve reliability, adopt the digital circuit scheme, promptly adopt microprocessor (single-chip microcomputer) system to realize.The valve positioner product that promptly adopts unique solution to realize.Improve the reliability of valve positioner, what especially the utility model adopted is that the system that modeling scheme mixes with digital scheme realizes.Adopting this scheme in like product also is unique at present.Technical solutions of the utility model are:
Valve positioner, comprise LVDT differential conductive displacement sensor, modulation and demodulation circuit, fault judgement and redundant processing circuit, regulating circuit and Calibration Circuit, the power amplification drive circuit, the nixie tube display circuit, formations such as microprocessor unit circuit are installed two LVDT displacement transducers, to guarantee the reliability of valve position feedback signal on each oil engine; Modulation and demodulation circuit provide the excitation alternating voltage to the LVDT sensor and the voltage signal of its reflection displacement of sending are handled, and seven kinds of combination disconnection faults of three-wire system LVDT sensor are correctly discerned; Adjusting and Calibration Circuit compare valve position feedback signal and valve position command signal, to delivering to the power amplification drive circuit after the computing of deviation process proportional integral, convert the required specific current signal of servovalve on the oil engine to, and oil engine can be moved up and down; Calibration Circuit can show and the zero-bit fed back, full position are demarcated oil engine, can export other system of normalized current signal to two that two-way characterizes valve seat opening simultaneously and carry out teletransmission and show; Above-mentioned modulation and demodulation circuit, fault judgement and redundant processing circuit, regulating circuit and Calibration Circuit, nixie tube display circuit all adopt special circuit; Microprocessor has the communication interface circuit with host computer; Be provided with two LVDT differential conductive displacement sensors, be furnished with corresponding failure and judge and redundant processing circuit, described fault judgement and redundant processing circuit are that seven kinds of combination disconnection signals of above-mentioned three-wire system LVDT sensor connect preferred recognition circuit; The parameter adjustment potentiometer of operation amplifier circuit all adopts the solid-state digital potentiometer in described regulating circuit and the Calibration Circuit.
Two LVDT displacement transducers are installed, to guarantee the reliability of valve position feedback signal on each oil engine.Modulation and demodulation circuit provide the excitation alternating voltage to the LVDT sensor and the voltage signal of its reflection displacement of sending are handled.If a sensor generation disconnection fault is wherein arranged, then fault judgement and redundant processing circuit can be rejected the signal of mistake automatically, with another normal signal Access Control and display circuit, can correctly discern seven kinds of combination disconnection faults of three-wire system LVDT sensor.
Regulating circuit compares valve position feedback signal and valve position command signal, to delivering to the power amplification drive circuit after the computing of deviation process proportional integral, converts the required specific current signal of servovalve on the oil engine to, and oil engine can be moved up and down.
Calibration Circuit can show and the zero-bit fed back, full position are demarcated oil engine, can export other system of normalized current signal to two that two-way characterizes valve seat opening simultaneously and carry out teletransmission and show.Adopt novel digital regulation resistance to replace traditional simulation multiturn potentiometer, can eliminate the influence that mechanical vibration, contact drift bring fully.
The nixie tube display circuit can directly convert the valve position feedback voltage signal to the digital signal of driving display spare, so that can easily monitor the variation of valve position on valve positioner.Microprocessor (single-chip microcomputer) system has the communication interface with computer, can carry out long-range demarcation to valve positioner easily from the interface of computer.The sliding unit of digital regulation resistance is controlled by microprocessor, the position of sliding end can be stored in the nonvolatile storage, can be called again when powering on, external characteristics and wire-wound multiturn potentiometer are similar, but can accurately be located and rate action control by microprocessor.
The scheme that the utility model valve positioner adopts analog circut to mix with digital circuit.Control and display unit employing in real time realizes having the advantage that never crashes based on the circuit of the pure hardware device formation of operational amplifier, has guaranteed the Security of The whole control system.If this part function realizes with microprocessor system, if were subjected to strong jamming would have may crash hidden danger, even adopted watchdog circuit commonly used, its effect also only is to automatically reset to restart behind system in case of system halt, and uncontrollable output disturbance process will appear in system in reseting procedure, is danger close for the process control of this quick object of steam turbine.Before coming into operation, valve positioner needs oil engine is shown and the zero-bit of feed back, a full timing signal, this part function adopts microprocessor (single-chip microcomputer) system to realize, make full use of its convenient, flexible characteristic, again microprocessor system and real-time control circuit are partly isolated after demarcating end, improve Security.
Description of drawings
Fig. 1 is the valve positioner functional-block diagram.
Fig. 2 is the valve positioner circuit theory diagrams, Fig. 2-the 1st, NE555 intergrated circuit and sensor and modulation-demodulation circuit figure; Fig. 2-the 2nd, display circuit, coding chip, power supply and A/D convertor circuit; Fig. 2-the 3rd, microprocessor, non-volatile potentiometer X9C102 and MAX232 chip circuit.
Embodiment
Shown in Figure 2, after adopting the external capacitance resistance ware of 555 intergrated circuit, produce the square signal of certain frequency, provide ac-excited voltage by 1: 1 isolating transformer to the LVDT sensor, the voltage signal of displacement size and direction is represented in the variation of sensor inductance value in moving process by modulation-demodulation circuit output.For making valve position feedback signal reliable, two LVDT sensors are installed on oil engine, like this when a sensor breaks down (such as broken string), another sensor still can feed back the position of valve, so adopted fault judgement and redundant processing circuit, to automatically one road signal of mistake be rejected by after handling relatively through the two-way feedback voltage signal of modulation-demodulation circuit output, then export preferred value (big value) as the equal fault-free of two paths of signals.
The valve position command signal of computer output (becomes voltage signal behind 4～20mA) the process sample resistances, carry out deviation calculation with the valve position feedback voltage signal by an OP07 operational amplifier, and then by two OP07 operational amplifiers with this deviation Integral Processing that gains, be that PI calculates. finally remove to drive electrohydraulic control on the oil engine by a positive and negative power amplification circuit output reversal signal of recommending, thereby drive regulating steam valve moves up or down. the unlatching of valve or close and drive the LVDT sensor and move, thereby change valve position feedback voltage, equate with valve position command voltage signal up to this voltage, power amplification circuit is output as zero, and oil engine then is stabilized on a certain position. and the output stage of power amplification circuit is two Darlington triode TIP127 (NPN) and TIP122 (PNP).
Valve position in regulating circuit and Calibration Circuit and LVDT differential conductive displacement sensor indication and the potentiometer of parameter adjustment in the operation amplifier circuit in demonstration in the oil engine Calibration Circuit and the feeder loop all adopted the solid-state digital potentiometer, be non-volatile potentiometer X9C102, digital control, inching function that digital regulation resistance has, the zeroing that can show easily and feed back, accent are expired.100 electric resistance array unit are arranged among the X9C102, between each unit and arbitrary end the tapping point that can be visited by sliding unit is all arranged.The position of sliding unit is by CS, U/D and INC totally three input end controls, and the position of sliding end can be stored in the nonvolatile storage, thereby can be called again when powering on next time.Control X9C102 by the 89C52 single-chip microcomputer, the sheet choosing end of eight X9C102 is produced by a 74LS138 decoder, when 89C52 need control X9C102, at first passes through P2.0, P2.1, the decision of three pin output of P2.3 decoding composite signal to which X9C102 is adjusted at present.After all digital regulation resistance adjustment end, put switch the Enable Pin E3 of 74LS138 chip is forced to high level with dialling, block all digital regulation resistance chip selection signals, thereby shield continuation operation fully to X9C102, even can guarantee so also not have any influence, improve Security in the normal operation of valve positioner central microprocessing systems appearance deadlock or hardover failure.
Valve position display interface on the valve positioner adopts biproduct somatotype AD converter ICL7135, convert the valve feedback voltage to digital signal, the signal of the different ICL7135 of being outputs with general A D transducer is the dynamic scan signals that are used for data display, so can directly drive the demonstration of five-digit number sign indicating number pipe after adding driving chip 1413 and coding chip 4513.
The communication interface of microprocessor (single-chip microcomputer) system and computer adopts the MAX232 chip, becomes standard RS232 signal to link to each other with computer by serial the TXD and the RXD signal conversion of Transistor-Transistor Logic level in the single-chip microcomputer, receives and send various communication datas.
Concrete circuit connects:
8 pin of 555 cores connect+the 15V power supply, 4,3,2, the resistance-capacitance circuit of 6 pin by two 50K resistance, a 10K resistance, 103 electric capacity produces the ac-excited signal about 2K, the output of 7 pin was connected one 100 ohm current-limiting resistance and was driven the elementary of 1: 1 isolating transformer, the secondary energized circuit of receiving LVDT of isolating transformer.7～14 pin of Max197 connect 62256 19,18,17,16,15,13,12,11 pin, connect 18,17,14,13,8,7,4,3 pin of 74HC373, connect 32～39 pin of 89c 58, connect 9,8,7,6 pin of 74LS245, connect printer standard interface 17,15,13,11,9,7,5,3, pin, connect display interface device 14～7 pin; The 24 pin output of Max197 connects 12 pin of 89c58, and 5,2 pin connect 12,13 pin of GAL16v8.62256 21,23,24,25,26,1,2,3 pin connect 2,3,6,9,12,15,16,19 pin of 74HC373; 4～10 pin connect 21～27 pin of 89c52, connect 3,4,5,6,7,8,9,11 pin of GAL16v8.11 pin of 74HC373 connect 30 pin of 89c52; 13,15 pin of 89c52 connect 6,17 pin of display interface device J1; 14,2,3 pin connect 1,19,2 pin of printer standard interface J2.15,16 pin of GAL16v8 connect 15,16 pin of display interface device J1.5,6,7,8 pin of 89c58 connect 4 * 4 keyboards, 1～4 pin.14,13,12,11 pin of 74LS245 connect 4 * 4 keyboards, 5～8 pin, and 19 pin connect 18 pin of GAL16v8.
Claims (3)
1, valve positioner, comprise: LVDT differential conductive displacement sensor, modulation and demodulation circuit, fault judgement and redundant processing circuit, regulating circuit and Calibration Circuit, the power amplification drive circuit, the nixie tube display circuit, formations such as microprocessor unit circuit are installed two LVDT displacement transducers, to guarantee the reliability of valve position feedback signal on each oil engine; Modulation and demodulation circuit provide the excitation alternating voltage to the LVDT sensor and the voltage signal of its reflection displacement of sending are handled, and seven kinds of combination disconnection faults of three-wire system LVDT sensor are correctly discerned; Adjusting and Calibration Circuit compare valve position feedback signal and valve position command signal, to delivering to the power amplification drive circuit after the computing of deviation process proportional integral, convert the required specific current signal of servovalve on the oil engine to, and oil engine can be moved up and down; Oil engine is shown Calibration Circuit and the zero-bit fed back, full position are demarcated, and can export other system of normalized current signal to two that two-way characterizes valve seat opening simultaneously and carry out teletransmission and show; Above-mentioned modulation and demodulation circuit, fault judgement and redundant processing circuit, regulating circuit and Calibration Circuit, nixie tube display circuit all adopt special circuit; It is characterized in that microprocessor has the communication interface circuit with host computer; Be provided with two LVDT differential conductive displacement sensors, be furnished with corresponding failure and judge and redundant processing circuit; Described fault judgement and redundant processing circuit are that seven kinds of combination disconnection signals of above-mentioned three-wire system LVDT sensor connect preferred recognition circuit; The parameter adjustment potentiometer of operation amplifier circuit all adopts the solid-state digital potentiometer in described regulating circuit and the Calibration Circuit.
2, valve positioner according to claim 1, its feature: be in described regulating circuit and Calibration Circuit and the LVDT differential conductive displacement sensor in the operation amplifier circuit parameter adjustment potentiometer all adopt the solid-state digital potentiometer.
3, valve positioner according to claim 1 and 2 is characterized in that digital regulation resistance is X9C102, and the controlled terminal of digital regulation resistance connects the microprocessor control end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520077613 CN2871853Y (en) | 2005-11-11 | 2005-11-11 | Valve-level controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520077613 CN2871853Y (en) | 2005-11-11 | 2005-11-11 | Valve-level controller |
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| CN2871853Y true CN2871853Y (en) | 2007-02-21 |
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| CN 200520077613 Expired - Lifetime CN2871853Y (en) | 2005-11-11 | 2005-11-11 | Valve-level controller |
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|---|---|---|---|---|
| CN101709980B (en) * | 2009-12-09 | 2011-01-05 | 天津津伯仪表技术有限公司 | Uncovering-free calibration method based on intelligent electric actuating mechanism |
| CN101603838B (en) * | 2009-07-13 | 2011-05-04 | 容云 | Intelligent transducer and calibration method thereof |
| CN102141172A (en) * | 2011-03-01 | 2011-08-03 | 江苏科技大学 | Device and method for identifying parameter of actuating mechanism in electrohydraulic linear displacement servo system |
| CN102339041A (en) * | 2010-07-19 | 2012-02-01 | 中国石油化工股份有限公司 | Distributed control system (DCS) for interlocking control valves |
| CN102360177A (en) * | 2011-09-15 | 2012-02-22 | 江苏科技大学 | Electro-hydraulic linear speed servo system |
| CN103114878A (en) * | 2013-03-11 | 2013-05-22 | 中国船舶重工集团公司第七�三研究所 | Non-disturbance switching system of boat main steam turbine control manner |
| CN103605393A (en) * | 2013-10-11 | 2014-02-26 | 北京航科发动机控制系统科技有限公司 | General closed-loop control system for providing positive and negative constant flow sources for aircraft engines |
| 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 |
| CN103939154A (en) * | 2014-04-15 | 2014-07-23 | 南京国电南自美卓控制系统有限公司 | Steam turbine governing valve redundancy control system and control method thereof |
| CN103953399A (en) * | 2014-05-19 | 2014-07-30 | 国家电网公司 | Monitoring device and online monitoring method of quick closing process of steam turbine inlet valve |
| CN105757057A (en) * | 2016-04-27 | 2016-07-13 | 中广核核电运营有限公司 | Stability test control method for turbine electrohydraulic control system locator |
| CN105758438A (en) * | 2016-03-04 | 2016-07-13 | 江西洪都航空工业集团有限责任公司 | Quick calibration device for LVDT signal demodulation circuit |
| CN105864485A (en) * | 2016-05-28 | 2016-08-17 | 太原理工大学 | Pilot valve device with differential control |
| CN106015692A (en) * | 2016-06-27 | 2016-10-12 | 南昌大学 | Card inserting type flutter signal self-adaptive proportional valve amplifier |
| CN106122557A (en) * | 2016-09-21 | 2016-11-16 | 潘琳琳 | A kind of intelligent electric valve positioner |
| CN106705822A (en) * | 2016-11-29 | 2017-05-24 | 中国神华能源股份有限公司 | Turbine valve stroke measuring device, turbine valve stroke monitoring system and turbine valve stroke monitoring method |
| CN106761965A (en) * | 2016-12-02 | 2017-05-31 | 贵州电网有限责任公司电力科学研究院 | The steam turbine load fluctuation on-line monitoring method that a kind of timing steam gate bite judges |
| CN107387859A (en) * | 2017-08-02 | 2017-11-24 | 杭州澎康自动化科技有限公司 | A kind of intelligence is double to select valve position feedback control method |
| CN108088598A (en) * | 2017-11-30 | 2018-05-29 | 江西洪都航空工业集团有限责任公司 | It is a kind of to verify PCU outputs and the device of overload values dynamic response |
| CN108151772A (en) * | 2017-11-30 | 2018-06-12 | 江西洪都航空工业集团有限责任公司 | A kind of LVDT signal pickup assemblies and its overload-resistant method |
| CN111487949A (en) * | 2020-04-24 | 2020-08-04 | 涌镇液压机械（上海）有限公司 | Debugging method and device for reversing valve control panel and reversing valve control panel |
| 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 |
| CN112484757A (en) * | 2020-11-17 | 2021-03-12 | 西安热工研究院有限公司 | Automatic calibration method for valve position sensor of servo card in digital electro-hydraulic control system |
| CN112524320A (en) * | 2020-11-30 | 2021-03-19 | 华能国际电力股份有限公司营口电厂 | Hydraulic butterfly valve control system |
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2005
- 2005-11-11 CN CN 200520077613 patent/CN2871853Y/en not_active Expired - Lifetime
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| CN101603838B (en) * | 2009-07-13 | 2011-05-04 | 容云 | Intelligent transducer and calibration method thereof |
| CN101709980B (en) * | 2009-12-09 | 2011-01-05 | 天津津伯仪表技术有限公司 | Uncovering-free calibration method based on intelligent electric actuating mechanism |
| CN102339041B (en) * | 2010-07-19 | 2013-01-02 | 中国石油化工股份有限公司 | Distributed control system (DCS) for interlocking control valves |
| CN102339041A (en) * | 2010-07-19 | 2012-02-01 | 中国石油化工股份有限公司 | Distributed control system (DCS) for interlocking control valves |
| CN102141172B (en) * | 2011-03-01 | 2012-11-14 | 江苏科技大学 | Device and method for identifying parameter of actuating mechanism in electrohydraulic linear displacement servo system |
| CN102141172A (en) * | 2011-03-01 | 2011-08-03 | 江苏科技大学 | Device and method for identifying parameter of actuating mechanism in electrohydraulic linear displacement servo system |
| 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 |
| CN103114878A (en) * | 2013-03-11 | 2013-05-22 | 中国船舶重工集团公司第七�三研究所 | Non-disturbance switching system of boat main steam turbine control manner |
| CN103605393B (en) * | 2013-10-11 | 2016-06-08 | 北京航科发动机控制系统科技有限公司 | A kind ofly provide the general purpose closed loop control system of positive and negative constant flow source for aircraft engine |
| CN103605393A (en) * | 2013-10-11 | 2014-02-26 | 北京航科发动机控制系统科技有限公司 | General closed-loop control system for providing positive and negative constant flow sources for aircraft engines |
| 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 |
| CN103939154A (en) * | 2014-04-15 | 2014-07-23 | 南京国电南自美卓控制系统有限公司 | Steam turbine governing valve redundancy control system and control method thereof |
| CN103953399B (en) * | 2014-05-19 | 2016-10-26 | 国家电网公司 | A kind of turbine admission valve quick closing valve process monitoring equipment and on-line monitoring method |
| CN103953399A (en) * | 2014-05-19 | 2014-07-30 | 国家电网公司 | Monitoring device and online monitoring method of quick closing process of steam turbine inlet valve |
| CN105758438A (en) * | 2016-03-04 | 2016-07-13 | 江西洪都航空工业集团有限责任公司 | Quick calibration device for LVDT signal demodulation circuit |
| CN105757057A (en) * | 2016-04-27 | 2016-07-13 | 中广核核电运营有限公司 | Stability test control method for turbine electrohydraulic control system locator |
| CN105864485A (en) * | 2016-05-28 | 2016-08-17 | 太原理工大学 | Pilot valve device with differential control |
| CN105864485B (en) * | 2016-05-28 | 2018-04-13 | 太原理工大学 | A kind of guide valve gear of Differential Control |
| CN106015692A (en) * | 2016-06-27 | 2016-10-12 | 南昌大学 | Card inserting type flutter signal self-adaptive proportional valve amplifier |
| CN106122557A (en) * | 2016-09-21 | 2016-11-16 | 潘琳琳 | A kind of intelligent electric valve positioner |
| CN106705822A (en) * | 2016-11-29 | 2017-05-24 | 中国神华能源股份有限公司 | Turbine valve stroke measuring device, turbine valve stroke monitoring system and turbine valve stroke monitoring method |
| CN106761965B (en) * | 2016-12-02 | 2018-06-22 | 贵州电网有限责任公司电力科学研究院 | The steam turbine load fluctuation on-line monitoring method that a kind of timing steam gate bite judges |
| CN106761965A (en) * | 2016-12-02 | 2017-05-31 | 贵州电网有限责任公司电力科学研究院 | The steam turbine load fluctuation on-line monitoring method that a kind of timing steam gate bite judges |
| CN107387859A (en) * | 2017-08-02 | 2017-11-24 | 杭州澎康自动化科技有限公司 | A kind of intelligence is double to select valve position feedback control method |
| CN107387859B (en) * | 2017-08-02 | 2019-06-18 | 杭州澎康自动化科技有限公司 | A kind of intelligence is double to select valve position feedback control method |
| CN108088598A (en) * | 2017-11-30 | 2018-05-29 | 江西洪都航空工业集团有限责任公司 | It is a kind of to verify PCU outputs and the device of overload values dynamic response |
| CN108151772A (en) * | 2017-11-30 | 2018-06-12 | 江西洪都航空工业集团有限责任公司 | A kind of LVDT signal pickup assemblies and its overload-resistant method |
| CN111487949A (en) * | 2020-04-24 | 2020-08-04 | 涌镇液压机械（上海）有限公司 | Debugging method and device for reversing valve control panel and reversing valve control panel |
| CN111487949B (en) * | 2020-04-24 | 2021-10-01 | 涌镇液压机械（上海）有限公司 | Debugging method and device for reversing valve control panel and reversing valve control panel |
| 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 |
| CN112484757A (en) * | 2020-11-17 | 2021-03-12 | 西安热工研究院有限公司 | Automatic calibration method for valve position sensor of servo card in digital electro-hydraulic control system |
| CN112524320A (en) * | 2020-11-30 | 2021-03-19 | 华能国际电力股份有限公司营口电厂 | Hydraulic butterfly valve control system |
| CN112524320B (en) * | 2020-11-30 | 2023-05-30 | 华能国际电力股份有限公司营口电厂 | Hydraulic butterfly valve control system |
| CN113531513A (en) * | 2021-07-28 | 2021-10-22 | 哈尔滨沃华智能发电设备有限公司 | Protection method of steam drum water level control system during steam inlet regulating valve failure of steam-driven water supply pump |
| CN116880287A (en) * | 2023-07-17 | 2023-10-13 | 北京科荣达航空科技股份有限公司 | Closed loop electronic controller and system |
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