CN113867237A - Control method and control system of electric gate valve and storage medium - Google Patents
Control method and control system of electric gate valve and storage medium Download PDFInfo
- Publication number
- CN113867237A CN113867237A CN202111328776.2A CN202111328776A CN113867237A CN 113867237 A CN113867237 A CN 113867237A CN 202111328776 A CN202111328776 A CN 202111328776A CN 113867237 A CN113867237 A CN 113867237A
- Authority
- CN
- China
- Prior art keywords
- gate valve
- electric gate
- current
- signal
- electric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000012549 training Methods 0.000 claims description 15
- 238000010801 machine learning Methods 0.000 claims description 10
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
In order to solve the technical problem that the service life of a coil of an electric gate valve is affected by the 'closing' operation of the electric gate valve by using a locked-rotor current in the conventional electric gate valve, the embodiment of the invention provides a control method, a control system and a storage medium of the electric gate valve, wherein the control method comprises the following steps: s1, acquiring a position indicator closing in-place signal of the electric gate valve and a current signal of a power supply loop of the electric gate valve in real time; s2, if a position indicator closing in-place signal of the electric gate valve is acquired, judging whether the current signal is located in a current interval corresponding to the electric gate valve closing in-place, and if so, sending a power-off signal of the electric gate valve to control the power-off of the electric gate valve; if not, the process returns to S1. According to the embodiment of the invention, after the position indicator closing position signal of the electric gate valve is acquired, whether the current signal is located in the corresponding current interval is judged to control the electric gate valve, so that the influence of the locked-rotor current on the service life of the coil of the electric gate valve is avoided.
Description
Technical Field
The invention relates to a control method, a control system and a storage medium of an electric brake valve.
Background
The electric gate valve is a pipeline accessory for controlling medium flow in a pipeline by changing the internal flow cross section area thereof, and plays roles of connecting or cutting off the medium, preventing the medium from flowing backwards, adjusting parameters such as pressure or flow of the medium, separating, mixing or distributing the medium, preventing the medium pressure from exceeding a fixed value, ensuring the safety of the pipeline or equipment and the like in a nuclear power plant. Electrically-operated gate valves serve as a safety boundary for nuclear systems, requiring that they be able to close reliably, i.e., a "zero-leak" seal, to ensure system safety and no leakage. When some electric gate valves are closed in place, the situation that the electric gate valves cannot be closed can often occur, the medium in the pipeline cannot be completely blocked, and some safety accidents occur.
Under normal conditions, when the electric gate valve is not tightly closed, an operator can have the following treatment methods: (1) the method comprises the following steps: an operator can manually adjust the valve position indicator according to the condition that the valve is not closed in place, and the adjustment is continuously carried out until the valve is closed; (2) method 2, the electric gate valve control system is provided with a corresponding hardware control circuit, a corresponding 'valve closing inching' operation button is set, and the power-on time of the electric gate valve which is inched by the operation button once is set. After the electric gate valve is closed in place, the position indicator can send out a signal of closing in place, and an operator of the valve manually moves the valve for a plurality of times according to the signal of closing in place, so that the closing is enhanced until the electric gate valve is really closed.
The basic principle of the method 1 and the method 2 is that after the position indicator of the electric gate valve sends a closing in-place signal, the motor of the electric gate valve is instantly electrified through inching to obtain larger inching current, so that the torque of the motor of the electric gate valve is increased (the torque of the motor is in a certain proportion to the current), larger power is provided for a valve plate of the electric gate valve, and the problem that the electric gate valve cannot be closed to a certain extent can be solved through inching for a plurality of times. However, such an operation has the following disadvantages: (1) in order to ensure that the electric motor can be turned off, the inching frequency is not fixed, and the reliable turning off can not be realized completely by the operation experience; (2) after the valve is closed in place, manual inching operation is needed, so that the potential safety hazard of a nuclear system and serious hazards such as motor stalling and burning caused by improper operation of personnel exist; (3) the automatic closing of the valve cannot be realized through random inching times; (4) if the inching process, the power supply of the electric gate valve has a problem, and the motor cannot be protected in time. (5) In the method 1, the valve operator manually adjusts the valve, which is limited by the environment, and when the valve is in a nuclear environment or at high temperature and high pressure, the valve position indicator is manually adjusted on site, so that great potential safety hazards exist for the operator.
The Chinese acceptance patent 'open-close control method and open-close control system of a meter stepping motor control valve' provides a method for controlling the open and close of the valve by judging locked-rotor current by a stepping motor. This patent adopts step number and locked rotor current of step motor, goes to judge through certain procedure, realizes opening and close of control valve. Such control systems have disadvantages in several respects: (1) the locked-rotor current is adopted for controlling the valve for a long time, so that the motor coil of the valve is greatly damaged to influence the service life; (2) the acquisition of the locked-rotor current adopts a special data acquisition system, and a formed valve control system is complex and is not beneficial to the flexible control of the valve; (3) aiming at different stepping motors, the stepping motor step number and the locked-rotor current are not fixed, and the valve closing automation cannot be realized.
Disclosure of Invention
In order to solve the technical problem that the service life of a coil of an electric gate valve is influenced by the 'closing' operation of the electric gate valve by using a locked-rotor current in the conventional electric gate valve, the embodiment of the invention provides a control method and a control system of the electric gate valve and a storage medium.
The embodiment of the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a control method for an electric gate valve, including:
s1, acquiring a position indicator closing in-place signal of the electric gate valve and a current signal of a power supply loop of the electric gate valve in real time;
s2, if a position indicator closing in-place signal of the electric gate valve is acquired, judging whether the current signal is located in a current interval corresponding to the electric gate valve closing in-place, and if so, sending a power-off signal of the electric gate valve to control the power-off of the electric gate valve; if not, the process returns to S1.
Further, the current interval corresponding to the closed position of the electric gate valve includes: after the electric gate valve is closed in place, the electric gate valve jumps to a corresponding current interval in the process of locked-rotor current from rated current.
Further, the current interval is obtained through machine learning algorithm training.
Further, the current signal is a three-phase current effective value signal.
In a second aspect, an embodiment of the present invention provides a control system for an electric gate valve, including:
the acquisition unit is used for acquiring a position indicator closing position signal of the electric gate valve and a current signal of a power supply loop of the electric gate valve in real time;
the judging unit is used for judging whether the current signal is positioned in a current interval corresponding to the closed position of the electric gate valve if the position indicator closed-position signal of the electric gate valve is acquired;
the sending unit is used for sending a power-off signal of the electric gate valve to control the power-off of the electric gate valve if the current signal is located in a current interval corresponding to the closed position of the electric gate valve; and
the return unit is used for returning to the acquisition unit if the current signal is not positioned in a current interval corresponding to the closed position of the electric gate valve;
and the minimum value of the current interval is smaller than the locked-rotor current.
Further, the device also comprises a current interval training unit which is used for obtaining a current interval corresponding to the closed position of the electric gate valve through machine learning algorithm training.
In a third aspect, an embodiment of the present invention provides a control system for an electric gate valve, including:
a power supply unit;
the current acquisition unit is used for acquiring a current signal of a power supply loop of the electric gate valve;
the signal acquisition unit is used for acquiring a position indicator closing position signal of the electric gate valve;
the controller is used for judging whether the current signal is positioned in a current interval corresponding to the closed position of the electric gate valve when the position indicator closed-position signal of the electric gate valve is acquired, and if so, sending a power-off signal of the electric gate valve through the signal output unit; and
the signal output unit is used for outputting a control signal for controlling the electric brake valve;
and the minimum value of the current interval is smaller than the locked-rotor current.
Further, the device also comprises a training unit, which is used for obtaining a current interval corresponding to the closed position of the electric gate valve through machine learning algorithm training.
Furthermore, the current signal collected by the current collecting unit is a three-phase current effective value signal.
In a fourth aspect, a computer readable storage medium having instructions stored thereon which, when executed on a computer, perform a method of controlling the electric gate valve.
Compared with the prior art, the embodiment of the invention has the following advantages and beneficial effects:
according to the control method, the control system and the storage medium of the electric gate valve, after the position indicator closing position signal of the electric gate valve is acquired, whether the current signal is located in the corresponding current interval is judged to control the electric gate valve, so that the defects that the electric gate valve is controlled by adopting a inching mode and a locked-rotor current are overcome, the electric gate valve is closed, and the influence of the locked-rotor current on the service life of a coil of the electric gate valve is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic flow chart of a control method of an electric gate valve.
Fig. 2 is a schematic view showing a control system of an electric gate valve.
Fig. 3 is a schematic structural diagram of a control system of another electric gate valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Examples
The problems in the prior art are that: after the position indicator of the electric gate valve sends a closing in-place signal, the electric gate valve is not really closed, and the electric gate valve needs to be continuously closed by adopting manual inching operation or a locked-rotor current control electric gate valve and other modes.
In order to solve the technical problem that the service life of a coil of an electric gate valve is affected by the 'close' operation of the electric gate valve by using a locked-rotor current in the conventional electric gate valve, an embodiment of the present invention provides a control method, a control system and a storage medium for the electric gate valve, and referring to fig. 1, a controller is used as an execution main body, and the embodiment of the present invention provides a control method for the electric gate valve, which includes: s1, acquiring a position indicator closing in-place signal of the electric gate valve and a current signal of a power supply loop of the electric gate valve in real time; s2, if a position indicator closing in-place signal of the electric gate valve is acquired, judging whether the current signal is located in a current interval corresponding to the electric gate valve closing in-place, and if so, sending a power-off signal of the electric gate valve to control the power-off of the electric gate valve; if not, the process returns to S1.
Therefore, the embodiment of the invention controls the electric gate valve by judging whether the current signal is positioned in the corresponding current interval after acquiring the position indicator closing position signal of the electric gate valve, thereby avoiding the defects of controlling the electric gate valve by adopting a inching mode and a locked-rotor current, realizing the 'closing' of the electric gate valve and avoiding the influence of the locked-rotor current on the service life of a coil of the electric gate valve.
Further, the current interval corresponding to the closed position of the electric gate valve includes: after the electric gate valve is closed in place, the electric gate valve jumps to a corresponding current interval in the process of locked-rotor current from rated current.
After the position indicator of the electric gate valve closes the in-place signal, whether the current signal is located in a current interval corresponding to the process that the rated current jumps to the locked-rotor current of the electric gate valve is judged, so that the current is closed and stopped before the locked-rotor current is reached, and the influence of the locked-rotor current on the service life of a coil of the electric gate valve is avoided.
Further, the current interval is obtained through machine learning algorithm training.
According to three-phase current effective value signals collected at the moment of locked rotor after a large number of electric gate valves are closed in place, a machine learning algorithm is utilized to train and obtain a current interval corresponding to the electric gate valve which can be closed in place in the process that the rated current jumps to the locked rotor current of the electric gate valve.
Further, the current signal is a three-phase current effective value signal.
In a second aspect, an embodiment of the present invention provides a control system for an electric gate valve, which is shown in fig. 2, and includes:
the acquisition unit is used for acquiring a position indicator closing position signal of the electric gate valve and a current signal of a power supply loop of the electric gate valve in real time;
the judging unit is used for judging whether the current signal is positioned in a current interval corresponding to the closed position of the electric gate valve if the position indicator closed-position signal of the electric gate valve is acquired;
the sending unit is used for sending a power-off signal of the electric gate valve to control the power-off of the electric gate valve if the current signal is located in a current interval corresponding to the closed position of the electric gate valve; and
the return unit is used for returning to the acquisition unit if the current signal is not positioned in a current interval corresponding to the closed position of the electric gate valve;
and the minimum value of the current interval is smaller than the locked-rotor current.
The principle is the same as the control method of the electric gate valve, and the description is omitted.
Further, the device also comprises a current interval training unit which is used for obtaining a current interval corresponding to the closed position of the electric gate valve through machine learning algorithm training.
In a third aspect, an embodiment of the present invention provides a control system for an electric gate valve, which is shown in fig. 3, and includes:
a power supply unit;
the current acquisition unit is used for acquiring a current signal of a power supply loop of the electric gate valve;
the signal acquisition unit is used for acquiring a position indicator closing position signal of the electric gate valve;
the controller is used for judging whether the current signal is positioned in a current interval corresponding to the closed position of the electric gate valve when the position indicator closed-position signal of the electric gate valve is acquired, and if so, sending a power-off signal of the electric gate valve through the signal output unit; and
the signal output unit is used for outputting a control signal for controlling the electric brake valve;
and the minimum value of the current interval is smaller than the locked-rotor current.
Further, the device also comprises a training unit, which is used for obtaining a current interval corresponding to the closed position of the electric gate valve through machine learning algorithm training.
Furthermore, the current signal collected by the current collecting unit is a three-phase current effective value signal.
The control unit is composed of an FPGA/DSP chip. A controller: the controller mainly adopts a single chip microcomputer, a built-in current comparison algorithm, a control algorithm, a delay unit and the like; a signal acquisition unit: collecting a position indicator signal of the electric gate valve, and transmitting the signal to a controller for subsequent processing; the current acquisition unit: collecting three-phase current of the electric gate valve by adopting a high-precision and rapid current sensor, converting the collected alternating current into direct current of 4-20 mA, and transmitting the direct current to a controller for subsequent treatment; a signal output unit: the control signal transmitted by the controller is used for subsequent valve control; a power supply unit: and providing corresponding power supplies for all units in the device.
When the electric gate valve is closed, the current signal on the power supply line is acquired through the current acquisition unit, and whether the line current jumps or not is judged through the controller to control the power supply of the electric gate valve, so that a larger motor torque is obtained, and the automatic closing of the electric gate valve is ensured.
The control system of the embodiment of the invention cancels a control mode of electric operation of the electric gate valve, mainly aims to solve the problem that the electric gate valve cannot be closed after the valve closing of some electric gate valves is in place, detects the effective value of three-phase current of a power supply circuit of the electric gate valve in real time through a built-in high-precision rapid current measurement unit, transmits the effective value to a control unit consisting of an FPGA/DSP chip to complete current processing and automatic judgment, and sends out a signal of closing in place, namely a signal of closing in place after delaying by judging whether the current of the electric gate valve jumps to a certain degree, so as to control the motor of the electric gate valve to rapidly cut off the power supply of the motor of the electric gate valve when the motor of the electric gate valve is locked, thereby achieving the purpose of obtaining larger motor torque and firmly closing the electric gate valve.
In a fourth aspect, a computer readable storage medium having instructions stored thereon which, when executed on a computer, perform a method of controlling the electric gate valve.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A control method of an electric gate valve, characterized by comprising:
s1, acquiring a position indicator closing in-place signal of the electric gate valve and a current signal of a power supply loop of the electric gate valve in real time;
s2, if a position indicator closing in-place signal of the electric gate valve is acquired, judging whether the current signal is located in a current interval corresponding to the electric gate valve closing in-place, and if so, sending a power-off signal of the electric gate valve to control the power-off of the electric gate valve; if not, the process returns to S1.
2. The method of controlling an electric gate valve according to claim 1, wherein the current interval corresponding to the closed position of the electric gate valve comprises: after the electric gate valve is closed in place, the electric gate valve jumps to a corresponding current interval in the process of locked-rotor current from rated current.
3. The control method of an electric gate valve according to claim 2, wherein the current interval is obtained by machine learning algorithm training.
4. The control method of the electric brake valve according to any one of claims 1 to 3, wherein the current signal is a three-phase current effective value signal.
5. A control system for an electrically operated gate valve, comprising:
the acquisition unit is used for acquiring a position indicator closing position signal of the electric gate valve and a current signal of a power supply loop of the electric gate valve in real time;
the judging unit is used for judging whether the current signal is positioned in a current interval corresponding to the closed position of the electric gate valve if the position indicator closed-position signal of the electric gate valve is acquired;
the sending unit is used for sending a power-off signal of the electric gate valve to control the power-off of the electric gate valve if the current signal is located in a current interval corresponding to the closed position of the electric gate valve; and
the return unit is used for returning to the acquisition unit if the current signal is not positioned in a current interval corresponding to the closed position of the electric gate valve;
and the minimum value of the current interval is smaller than the locked-rotor current.
6. The control system of an electric gate valve according to claim 5, further comprising a current interval training unit for obtaining a current interval corresponding to the electric gate valve after the closing position by training through a machine learning algorithm.
7. A control system for an electrically operated gate valve, comprising:
a power supply unit;
the current acquisition unit is used for acquiring a current signal of a power supply loop of the electric gate valve;
the signal acquisition unit is used for acquiring a position indicator closing position signal of the electric gate valve;
the controller is used for judging whether the current signal is positioned in a current interval corresponding to the closed position of the electric gate valve when the position indicator closed-position signal of the electric gate valve is acquired, and if so, sending a power-off signal of the electric gate valve through the signal output unit; and
the signal output unit is used for outputting a control signal for controlling the electric brake valve;
and the minimum value of the current interval is smaller than the locked-rotor current.
8. The control system of claim 7, further comprising a training unit for training the current interval corresponding to the closed position of the electric gate valve by a machine learning algorithm.
9. The control system of the electric brake valve according to claim 7, wherein the current signal collected by the current collecting unit is a three-phase current effective value signal.
10. A computer-readable storage medium having stored thereon instructions which, when executed on a computer, perform a method of controlling an electric brake valve according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111328776.2A CN113867237A (en) | 2021-11-10 | 2021-11-10 | Control method and control system of electric gate valve and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111328776.2A CN113867237A (en) | 2021-11-10 | 2021-11-10 | Control method and control system of electric gate valve and storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113867237A true CN113867237A (en) | 2021-12-31 |
Family
ID=78987753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111328776.2A Pending CN113867237A (en) | 2021-11-10 | 2021-11-10 | Control method and control system of electric gate valve and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113867237A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201435009Y (en) * | 2009-06-26 | 2010-03-31 | 河北申科电子股份有限公司 | Intelligent localizer control device |
| CN101814716A (en) * | 2010-03-31 | 2010-08-25 | 银川英奥特自控有限公司 | Current signal detecting switch and valve control and fault protection device |
| JP2011102621A (en) * | 2009-11-11 | 2011-05-26 | Toshiba Corp | Control device of motor valve |
| CN203431276U (en) * | 2013-08-27 | 2014-02-12 | 中国神华能源股份有限公司 | Control system of electric actuating mechanism |
| CN105974852A (en) * | 2016-07-06 | 2016-09-28 | 唐山现代工控技术有限公司 | Method and apparatus for remote controlling hydraulic gate |
-
2021
- 2021-11-10 CN CN202111328776.2A patent/CN113867237A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201435009Y (en) * | 2009-06-26 | 2010-03-31 | 河北申科电子股份有限公司 | Intelligent localizer control device |
| JP2011102621A (en) * | 2009-11-11 | 2011-05-26 | Toshiba Corp | Control device of motor valve |
| CN101814716A (en) * | 2010-03-31 | 2010-08-25 | 银川英奥特自控有限公司 | Current signal detecting switch and valve control and fault protection device |
| CN203431276U (en) * | 2013-08-27 | 2014-02-12 | 中国神华能源股份有限公司 | Control system of electric actuating mechanism |
| CN105974852A (en) * | 2016-07-06 | 2016-09-28 | 唐山现代工控技术有限公司 | Method and apparatus for remote controlling hydraulic gate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109131286A (en) | A kind of the train passenger emergency braking control device and method of redundancy | |
| CA2594772A1 (en) | Motorized watercraft with a control device | |
| CN113867237A (en) | Control method and control system of electric gate valve and storage medium | |
| CN106678440A (en) | Electromagnetic valve driving device with self diagnosis function | |
| CN101783640B (en) | Motor speed closed loop control method | |
| CN102935893A (en) | Feathering parking protection method and feathering parking protection device of engine | |
| CN109555888B (en) | Control system and test method for main steam isolation valve of nuclear power platform | |
| CN207064268U (en) | A kind of condensate pump permanent magnetic speed-adjusting control system | |
| GB2535834A (en) | Method for segmental control of auxillary feedwater flow | |
| CN114062770A (en) | Inching control method and inching control system of electric gate valve and storage medium | |
| CN108061195B (en) | Method for accurately detecting switching speed of high-frequency quick-switching valve in VPSA process | |
| CN103550885B (en) | Fire fighting truck and water fetching control device, system and method thereof | |
| CN109433287A (en) | A kind of cooling water tank with heat preservation temperature controlling function | |
| CN205417663U (en) | Automatic rail control device for railway and highway grade crossings | |
| AU2018100164A4 (en) | A tap timer system, method and apparatus capable of detecting solenoid valve malfunction and notifying user immediately | |
| CN102270853B (en) | Control method for transferring load by power transformer in ship power system and control device thereof | |
| CN202545105U (en) | Pneumatic control device for unit of hydropower station | |
| CN107643483B (en) | CRH5 EMUs air pressure switch setting valve detection adjustment device and detection method | |
| CN103751930A (en) | Fire fighting truck and water fetching control device, system and method thereof | |
| KR20170012618A (en) | Remote control and monitor apparatus of manual load switching type pad mounted transformer | |
| CN105204384A (en) | Motor group operation monitoring method | |
| CN109723881A (en) | A kind of electric performance device | |
| CN219346245U (en) | Antifreezing protection device for outdoor water pipeline of machine room | |
| CN204240526U (en) | Air exhausting device | |
| CN108803474A (en) | A kind of portable electric gunnel remote control and its control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |