CN111142373A - Flow control method and device based on intelligent metering valve - Google Patents
Flow control method and device based on intelligent metering valve Download PDFInfo
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- CN111142373A CN111142373A CN201911423649.3A CN201911423649A CN111142373A CN 111142373 A CN111142373 A CN 111142373A CN 201911423649 A CN201911423649 A CN 201911423649A CN 111142373 A CN111142373 A CN 111142373A
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- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
Abstract
The invention provides a flow control method and device based on an intelligent metering valve. The method comprises the following steps: the method comprises the steps of monitoring a flow numerical value in real time, obtaining a flow real-time numerical value, determining a flow numerical value to be calculated according to the flow real-time numerical value, establishing a PID control algorithm, calculating the flow numerical value to be calculated according to the PID control algorithm, obtaining a valve action increment, obtaining a locally set valve action increment and corresponding valve action, establishing a valve increment action corresponding table, searching corresponding valve action from the valve increment action corresponding table according to the valve action increment, and controlling the flow according to the valve action. The invention integrates the PID control algorithm and the valve control, integrates the intelligent control algorithm of the flow into the control circuit software, and enables the regulating valve and the flow controller to form a whole to form a special precise intelligent flow control valve, thereby being capable of long-term high-reliability maintenance-free operation, enlarging the range and precisely controlling the flow.
Description
Technical Field
The invention relates to the technical field of electric regulating valves in industrial automation, in particular to a flow control method and device based on an intelligent metering valve.
Background
Flow control is one of the main control systems in industrial automation, where precise metering control of flow is also a necessity in some industries. It generally consists of a flow driving source (which may be a fluid under pressure or a fluid driven by a pump), a flow control system, an electrically operated regulating valve and a flow meter. The most complicated and difficult construction in the flow control system is the connection between the control system and the regulating valve, the regulating valve has given input (4-20mA or other input modes, valve opening feedback 4-20mA and the like) for flow control, the control system is provided with the flow controller, the control and feedback of the regulating valve generally adopt an analog output input module of a PLC system, the PLC controls the regulating valve and also relates to flow control algorithm software, and lightning protection is also considered when the regulating valve is far away from the control system, so that the flow control system is complex in technology and high in cost. Moreover, the range algorithm of the conventional electric regulating valve is limited, the maximum flow ratio and the minimum flow ratio of the general theoretical design are 1:30, the actual operation is only 1:5, the regulating valve is used for general industrial control and has no problem, but the regulating valve cannot be used for precisely metering and controlling the flow in a wide range. Thus, for some users who have a critical need for precise flow metering control but are difficult or technically inadequate, conventional flow control systems are not technically adequate, and their economic cost is unacceptable to many users.
At present, users needing precise flow metering control generally adopt metering pumps to meet technical requirements, but in the application of metering pumps in about 20 years, mechanical abrasion caused by the reciprocating motion of the machines is serious, noise is large, vibration is large, the failure rate is high, the reliability is low, long-term operation nonlinearity is serious, the maintenance cost is high, certain difficulty exists, and the metering pumps become a pain point of precise flow metering dosing equipment acknowledged in the industry.
Therefore, a method for precisely controlling the flow rate is needed, which can precisely control the flow rate on the basis of economic and reliable.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
In view of this, the invention provides a flow control method and device based on an intelligent metering valve, and aims to solve the technical problem that the prior art cannot realize precise control of flow on the basis of economy and reliability.
The technical scheme of the invention is realized as follows:
in one aspect, the present invention provides a flow control method based on an intelligent metering valve, including the following steps:
s1, monitoring the flow value in real time, acquiring the flow real-time value, and determining the flow value to be calculated according to the flow real-time value;
s2, establishing a PID control algorithm, calculating the flow value to be calculated according to the PID control algorithm, and acquiring the valve action increment;
and S3, acquiring locally set valve action increment and corresponding valve action, establishing a valve increment action corresponding table, searching corresponding valve action from the valve increment action corresponding table according to the valve action increment, and controlling the flow according to the valve action.
On the basis of the above technical solution, preferably, in step S1, before monitoring the flow value in real time, obtaining a real-time flow value, and determining the flow value to be calculated according to the real-time flow value, the method further includes the following steps of receiving a flow control instruction, detecting whether a parameter modification instruction exists in the flow control instruction, and modifying a corresponding parameter according to the parameter modification instruction when the parameter modification instruction exists, where the parameter includes: a flow threshold and a flow balance state ratio; and when no parameter modification instruction exists, monitoring the flow value in real time, acquiring the flow real-time value, and determining the flow value to be calculated according to the flow real-time value.
On the basis of the technical scheme, preferably, the flow value is monitored in real time, the flow real-time value is obtained, the flow value to be calculated is determined according to the flow real-time value, the method further comprises the following steps of obtaining a local flow threshold value, comparing the flow real-time value with the flow threshold value, and when the flow real-time value is equal to the flow threshold value, re-receiving the flow monitoring instruction; and when the real-time flow value is not equal to the flow threshold value, establishing a PID control algorithm, and calculating the flow value to be calculated according to the PID control algorithm to obtain the valve action increment.
On the basis of the above technical solution, preferably, the method further includes the following steps, and the PID control algorithm is:
Δu[n]＝Kp{e[n]-e[n-1]}+Kie[n]+Kd{e[n]-2e[n-1]+e[n-2]}；
wherein, Δ u [ n ]]Representing incremental valve action, KpRepresents the proportionality coefficient, e [ n ]]Representing the controlled variable at time n, n representing a discrete independent variable, KiRepresents an integral coefficient, and
Kdrepresents a differential coefficient, and
t represents the sampling period, TiRepresents the integration time constant, TdRepresenting the differential time constant.
On the basis of the above technical solution, preferably, in step S3, obtaining a locally set valve action increment and a corresponding valve action, establishing a valve increment action correspondence table, searching for a corresponding valve action from the valve increment action correspondence table according to the valve action increment, and controlling a flow rate according to the valve action, and further including the steps of obtaining a current valve action amplitude in real time, determining a final valve action amplitude according to the valve action increment and the current valve action amplitude, controlling the valve according to the valve action, recording an action amplitude when the valve stops in real time, comparing the action amplitude with the final valve action amplitude, and controlling the flow rate according to a comparison result.
On the basis of the above technical solution, preferably, the action amplitude is compared with the final action amplitude of the valve, and the flow is controlled according to the comparison result, further comprising the steps of comparing the action amplitude with the final action amplitude of the valve, calculating a deviation value between the action amplitudes when the action amplitude is different from the final action amplitude of the valve, re-determining the valve action amount according to the deviation value, and controlling the valve; and when the action amplitude is the same as the final action amplitude of the valve, detecting the current regulated flow value.
On the basis of the above technical scheme, preferably, when the action amplitude is the same as the final action amplitude of the valve, the flow value at the moment is detected, and the method further comprises the following steps of setting a flow balance state ratio, extracting a maximum flow value and a minimum flow value from the regulated flow values, calculating the ratio between the maximum flow value and the minimum flow value, comparing the ratio with the flow balance state ratio, and when the ratio is the same as the flow balance state ratio, waiting for a flow control instruction again; and when the ratio is different from the flow balance state ratio, controlling the flow again according to the regulated flow value through a PID control algorithm.
Still further preferably, the flow control method device based on the intelligent metering valve comprises:
the monitoring module is used for monitoring the flow value in real time, acquiring the flow real-time value and determining the flow value to be calculated according to the flow real-time value;
the calculation module is used for establishing a PID control algorithm, calculating the flow value to be calculated according to the PID control algorithm and acquiring the valve action increment;
and the control module is used for acquiring locally set valve action increment and corresponding valve action, establishing a valve increment action corresponding table, searching corresponding valve action from the valve increment action corresponding table according to the valve action increment, and controlling the flow according to the valve action.
In a second aspect, the method for flow control based on an intelligent metering valve further comprises an apparatus comprising: a memory, a processor, and an intelligent metering valve based flow control method program stored on the memory and executable on the processor, the intelligent metering valve based flow control method program configured to implement the steps of the intelligent metering valve based flow control method as described above.
In a third aspect, the method for flow control based on an intelligent metering valve further includes a medium, where the medium is a computer medium, and the computer medium stores a program for flow control based on an intelligent metering valve, and the program for flow control based on an intelligent metering valve, when executed by a processor, implements the steps of the method for flow control based on an intelligent metering valve as described above.
Compared with the prior art, the flow control method based on the intelligent metering valve has the following beneficial effects:
(1) by establishing a PID control algorithm, the valve action quantity can be accurately calculated by utilizing the flow numerical value, and then the precise control of the flow is realized through the valve action quantity, so that the system error is reduced, and the response speed and the response effect of the system are improved;
(2) the PID control algorithm and the valve control are combined to be a whole, and the valve is directly controlled through the PID control algorithm, so that the reaction time of the system is reduced, the precision of flow control is improved, and the manufacturing cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an apparatus in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a first embodiment of a flow control method based on an intelligent metering valve of the present invention;
FIG. 3 is a schematic control flow chart of the flow control method based on the intelligent metering valve of the present invention;
fig. 4 is a functional block diagram of a first embodiment of the flow control method based on the intelligent metering valve of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the apparatus may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or may be a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the device, and that in actual implementations the device may include more or less components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a medium, may include therein an operating system, a network communication module, a user interface module, and a flow control method program based on an intelligent metering valve.
In the device shown in fig. 1, the network interface 1004 is mainly used for establishing a communication connection between the device and a server storing all data required in the system of the intelligent metering valve-based flow control method; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 of the intelligent metering valve-based flow control method device of the present invention may be arranged in the intelligent metering valve-based flow control method device, and the intelligent metering valve-based flow control method device calls the intelligent metering valve-based flow control method program stored in the memory 1005 through the processor 1001 and executes the intelligent metering valve-based flow control method provided by the implementation of the present invention.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of a flow control method based on an intelligent metering valve according to the present invention.
In this embodiment, the flow control method based on the intelligent metering valve includes the following steps:
s10: and monitoring the flow value in real time, acquiring the flow real-time value, and determining the flow value to be calculated according to the flow real-time value.
It should be understood that, before monitoring the flow value, the system also receives the flow control command, and then determines whether the flow control command includes a parameter modification command, and if the parameter modification command exists, modifies the corresponding parameter according to the parameter modification command, where the parameters include: a flow threshold and a flow balance state ratio; and when no parameter modification instruction exists, monitoring the flow value in real time and acquiring the flow real-time value.
It should be understood that, before the real-time flow value is calculated through the PID control algorithm, the system compares the real-time flow value with a previously set local flow threshold, and determines whether the flow is unbalanced through this comparison method, and if the real-time flow value is equal to the flow threshold, it indicates that the flow is not unbalanced, and control is not required, at this time, the system returns to the first step to continue waiting for a flow control instruction; if the real-time flow value is not equal to the flow threshold value, the flow needs to be controlled, and at the moment, the system can calculate the real-time flow value through a PID control algorithm to obtain the action increment of the valve. By the judgment mode, the workload of the system can be reduced, and the use of resources can be saved.
S20: and establishing a PID control algorithm, and calculating the flow value to be calculated according to the PID control algorithm to obtain the valve action increment.
It should be understood that the PID control algorithm described herein is an incremental PID control, and the specific formula is as follows:
Δu[n]＝Kp{e[n]-e[n-1]}+Kie[n]+Kd{e[n]-2e[n-1]+e[n-2]}；
wherein, Δ u [ n ]]Representing incremental valve action, KpRepresents the proportionality coefficient, e [ n ]]Representing the controlled variable at time n, n representing a discrete independent variable, KiRepresents an integral coefficient, and
Kdrepresents a differential coefficient, and
t represents the sampling period, TiRepresents the integration time constant, TdRepresenting the differential time constant.
It should be understood that incremental PID control is a basic form of digital PID control algorithm, and is a control algorithm that performs PID control on the increment of a controlled variable (the difference between the current controlled variable and the last controlled variable), and PID control, namely proportional-integral-derivative control, is a control method defined in the automatic control principle, and may also be called a correction method.
It should be understood that the incremental PID control method is used in the present embodiment to implement the flow control logic, but the flow control logic may also be implemented by adopting standard PID control, adaptive PID control, fuzzy control and intelligent control.
S30: the method comprises the steps of obtaining locally set valve action increment and corresponding valve action, establishing a valve increment action corresponding table, searching corresponding valve action from the valve increment action corresponding table according to the valve action increment, and controlling flow according to the valve action.
It should be understood that the system will establish a valve increment action corresponding table according to a locally preset valve action increment and a corresponding valve action, find a corresponding valve action from the valve increment action corresponding table according to the valve action increment after calculating the valve action increment through an incremental PID algorithm, and then drive the valve to perform a corresponding action.
It should be understood that after the valve performs the corresponding action, the system obtains the current action amplitude of the valve in real time, then determines the final action amplitude of the valve according to the valve action increment and the current action amplitude of the valve, judges whether the valve completes the specified action according to the final action amplitude of the valve, and if the valve completes the specified action, the system detects the regulated flow value at the moment; if not, the system calculates a deviation value between the action amplitudes, and determines the valve action amount again according to the deviation value to control the valve.
It should be understood that the system will finally detect whether the flow control reaches the balance, and the specific detection method is that the system will set the ratio of the flow balance state, extract the maximum flow value and the minimum flow value from the regulated flow value, calculate the ratio between the maximum flow value and the minimum flow value, compare the ratio with the ratio of the flow balance state, and wait for the flow control command again when the ratio is the same as the ratio of the flow balance state; and when the ratio is different from the flow balance state ratio, controlling the flow again according to the regulated flow value through a PID control algorithm. By the method, the flow can be precisely controlled, and the cost is reduced.
Referring to fig. 3, fig. 3 is a schematic control flow chart of a flow control method based on an intelligent metering valve according to the present invention.
It should be understood that, in the embodiment, the intelligent control algorithm of the flow rate is integrated into the control circuit software, so that the regulating valve and the flow controller form a whole to form a specially-made precise intelligent flow rate control valve, the design and construction of the flow rate control system are greatly simplified, for a user needing precise flow rate measurement control, the specially-made valve can form a set of precise flow rate control system only by adding one flow meter and selecting a proper fluid driving source, the system is simple in composition, low in manufacturing cost and simple in construction, and has extremely wide application range in the fields of water industry, pharmacy, chemical industry and the like, and remarkable economic and social benefits are achieved.
It should be understood that the control flow of the present embodiment has two control modes: a local normal control mode and a remote communication intelligent control mode.
The local control mode is characterized by that it utilizes its own keyboard and display to calibrate the upper and lower limits of regulating valve, valve control sensitivity, alarm information, etc. and set flow control index, flow control range and various control parameters of control algorithm, such as PID parameter setting, etc. under the local control mode, the flow precision metering control formed by using said valve as core only has need of connecting 4-20mA flow signal of flow meter on the electric actuating mechanism of control valve to form flow meter control system, and the display unit of electric actuating mechanism can directly adopt multistage menu to display action state of valve opening, flow setting and actual value and other related information.
The MODBUS communication protocol is utilized during remote communication intelligent control, all parameters of the electric actuating mechanism such as flow range, control points, parameters of a control algorithm and the like can be set in a communication mode, all operation parameters of the electric actuating mechanism can be remotely transmitted to a control system to be displayed, the control mode only needs a PLC (programmable logic controller) communication interface, an analog input and output interface module is not needed, or the control mode directly adopts a touch screen or an upper computer to control in a communication mode without adopting the PLC (programmable logic controller), the design of the control system is greatly simplified, the system cost is saved, and the reliability of the system is improved.
It should be understood that this embodiment uses a medium flow metering method, and the metering is a measure that uses technical and legal means to achieve uniform unit and accurate and reliable measurement. In the metrology process, the gauges and instruments used are considered standard and are used to calibrate, certify the gauge under test and the instrument equipment to measure and ensure the reliability of the measurements obtained when the gauge under test instruments are used for measurements. Metering involves the definition and conversion of units of metering; the transmission of the quantity values and the measures, regulations, laws and the like which must be taken to ensure the uniformity of the quantity values. The precision required for metering is high.
The specially-made electric actuator is provided with a metering control valve specially made by the company, and is greatly different from a conventional angle stroke regulating valve. Taking an angular travel regulating valve commonly used for industrial control as an example, a valve core of the angular travel regulating valve is a round ball, an O-shaped round hole is formed in the middle of the valve core, the valve core is driven to rotate along with the rotation of an angular travel executing mechanism, the opening degree of the valve is increased, the flow cross section area is gradually increased, the flow shape is from a small ellipse to a large ellipse to a perfect circle, the flow area is the maximum, the valve core continues to rotate, the flow cross section area is gradually reduced, and finally the valve core is closed by stopping. The flow rate change is a process from small to large and small with the rotation of the angular stroke center mechanism, but the flow rate change is nonlinear, and the initial controllable flow rate cannot be small. The valve core of the special metering control valve is characterized in that a W-shaped flow hole is formed in a solid ball core, the flow area and the rotation angle are linearly increased along with the rotation of the ball core, the flow area of the valve is small at the initial position so as to ensure that the flow control is performed from a small flow as an initial value (the initial control flow of a general angular stroke regulating valve is difficult to be less than 100L/h), the flow control range of the flow control valve is 8-800L/h under the general pressure difference condition, the ratio of the maximum flow to the minimum flow reaches 1:100 and far exceeds the control range of a general electric regulating valve 1:5, the control precision is generally within 0.5 percent and far exceeds the theoretical control precision of a metering pump by 5 percent, the actual long-term operation nonlinear error is large, and the precise metering control target of the flow is realized.
The control valve has the advantages that the valve position maintains the dynamic balance of the flow after the flow control reaches the control index, the action is stopped, and compared with the continuous back-and-forth operation of a metering pump, the mechanical abrasion is greatly reduced, so the reliability is greatly increased, the noise of the whole system is low, the vibration is small, the control precision is high, and the control valve can be operated without faults and maintenance for a long time.
The above description is only for illustrative purposes and does not limit the technical solutions of the present application in any way.
As can be easily found from the above description, in this embodiment, a flow real-time value is obtained by monitoring a flow value in real time, a flow value to be calculated is determined according to the flow real-time value, a PID control algorithm is established, the flow value to be calculated is calculated according to the PID control algorithm, a valve action increment is obtained, a locally set valve action increment and a corresponding valve action are obtained, a valve increment action correspondence table is established, a corresponding valve action is searched from the valve increment action correspondence table according to the valve action increment, and the flow is controlled according to the valve action. In the embodiment, the PID control algorithm is combined with the valve control, and the intelligent control algorithm of the flow is integrated into the control circuit software, so that the regulating valve and the flow controller form a whole body to form a specially-made precise intelligent flow metering control valve, the traditional precise flow metering control mode is changed, the maintenance-free operation with long-term high reliability can be realized, the economic investment is greatly reduced, the range is enlarged, and the control on the flow can be precise.
In addition, the embodiment of the invention also provides a flow control method and device based on the intelligent metering valve. As shown in fig. 4, the flow control method device based on the intelligent metering valve comprises the following steps: monitoring module 10, calculation module 20, control module 30.
The monitoring module 10 is used for monitoring the flow value in real time, acquiring the flow real-time value, and determining the flow value to be calculated according to the flow real-time value;
the calculation module 20 is used for establishing a PID control algorithm, calculating the flow value to be calculated according to the PID control algorithm and acquiring the valve action increment;
the control module 30 is configured to obtain a locally set valve action increment and a corresponding valve action, establish a valve increment action correspondence table, search for a corresponding valve action from the valve increment action correspondence table according to the valve action increment, and control a flow according to the valve action.
In addition, it should be noted that the above-described embodiments of the apparatus are merely illustrative, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of the modules to implement the purpose of the embodiments according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not elaborated in this embodiment may be referred to a flow control method based on an intelligent metering valve provided in any embodiment of the present invention, and are not described herein again.
In addition, an embodiment of the present invention further provides a medium, where the medium is a computer medium, where a flow control method program based on an intelligent metering valve is stored on the computer medium, and when executed by a processor, the flow control method program based on the intelligent metering valve implements the following operations:
s1, monitoring the flow value in real time, acquiring the flow real-time value, and determining the flow value to be calculated according to the flow real-time value;
s2, establishing a PID control algorithm, calculating the flow value to be calculated according to the PID control algorithm, and acquiring the valve action increment;
and S3, acquiring locally set valve action increment and corresponding valve action, establishing a valve increment action corresponding table, searching corresponding valve action from the valve increment action corresponding table according to the valve action increment, and controlling the flow according to the valve action.
Further, the flow control method program based on the intelligent metering valve is executed by the processor to realize the following operations:
receiving a flow control instruction, detecting whether a parameter modification instruction exists in the flow control instruction, and modifying corresponding parameters according to the parameter modification instruction when the parameter modification instruction exists, wherein the parameters comprise: a flow threshold and a flow balance state ratio; and when no parameter modification instruction exists, monitoring the flow value in real time, acquiring the flow real-time value, and determining the flow value to be calculated according to the flow real-time value.
Further, the flow control method program based on the intelligent metering valve is executed by the processor to realize the following operations:
obtaining a local flow threshold, comparing the real-time flow value with the flow threshold, and re-receiving a flow monitoring instruction when the real-time flow value is equal to the flow threshold; and when the real-time flow value is not equal to the flow threshold value, establishing a PID control algorithm, and calculating the flow value to be calculated according to the PID control algorithm to obtain the valve action increment.
Further, the flow control method program based on the intelligent metering valve is executed by the processor to realize the following operations:
the PID control algorithm is as follows:
Δu[n]＝Kp{e[n]-e[n-1]}+Kie[n]+Kd{e[n]-2e[n-1]+e[n-2]}；
wherein, Δ u [ n ]]Representing incremental valve action, KpRepresents the proportionality coefficient, e [ n ]]Representing the controlled variable at time n, n representing a discrete independent variable, KiRepresents an integral coefficient, and
Kdrepresents a differential coefficient, and
t represents the sampling period, TiRepresents the integration time constant, TdRepresenting the differential time constant.
Further, the flow control method program based on the intelligent metering valve is executed by the processor to realize the following operations:
the method comprises the steps of acquiring the current action amplitude of a valve in real time, determining the final action amplitude of the valve according to the valve action increment and the current action amplitude of the valve, controlling the valve according to the valve action, recording the action amplitude when the valve stops in real time, comparing the action amplitude with the final action amplitude of the valve, and controlling the flow according to the comparison result.
Further, the flow control method program based on the intelligent metering valve is executed by the processor to realize the following operations:
comparing the action amplitude with the final action amplitude of the valve, calculating a deviation value between the action amplitudes when the action amplitude is different from the final action amplitude of the valve, re-determining the action quantity of the valve according to the deviation value, and controlling the valve; and when the action amplitude is the same as the final action amplitude of the valve, detecting the current regulated flow value.
Further, the flow control method program based on the intelligent metering valve is executed by the processor to realize the following operations:
setting a flow balance state ratio, extracting a maximum flow value and a minimum flow value from the regulated flow values, calculating the ratio between the maximum flow value and the minimum flow value, comparing the ratio with the flow balance state ratio, and waiting for a flow control instruction again when the ratio is the same as the flow balance state ratio; and when the ratio is different from the flow balance state ratio, controlling the flow again according to the regulated flow value through a PID control algorithm.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A flow control method based on an intelligent metering valve is characterized in that: comprises the following steps;
s1, monitoring the flow value in real time, acquiring the flow real-time value, and determining the flow value to be calculated according to the flow real-time value;
s2, establishing a PID control algorithm, calculating the flow value to be calculated according to the PID control algorithm, and acquiring the valve action increment;
and S3, acquiring locally set valve action increment and corresponding valve action, establishing a valve increment action corresponding table, searching corresponding valve action from the valve increment action corresponding table according to the valve action increment, and controlling the flow according to the valve action.
2. The intelligent metering valve based flow control method of claim 1, wherein: in step S1, monitoring the flow value in real time, obtaining a real-time flow value, and before determining the flow value to be calculated according to the real-time flow value, the method further includes the following steps of receiving a flow control command, detecting whether a parameter modification command exists in the flow control command, and modifying a corresponding parameter according to the parameter modification command when the parameter modification command exists, where the parameter includes: a flow threshold and a flow balance state ratio; and when no parameter modification instruction exists, monitoring the flow value in real time, acquiring the flow real-time value, and determining the flow value to be calculated according to the flow real-time value.
3. A flow control method based on an intelligent metering valve as set forth in claim 2 wherein: monitoring the flow value in real time, acquiring the real-time flow value, determining the flow value to be calculated according to the real-time flow value, acquiring a local flow threshold value, comparing the real-time flow value with the flow threshold value, and re-receiving a flow monitoring instruction when the real-time flow value is equal to the flow threshold value; and when the real-time flow value is not equal to the flow threshold value, establishing a PID control algorithm, and calculating the flow value to be calculated according to the PID control algorithm to obtain the valve action increment.
4. A flow control method based on an intelligent metering valve as set forth in claim 3 wherein: the method also comprises the following steps that:
Δu[n]＝Kp{e[n]-e[n-1]}+Kie[n]+Kd{e[n]-2e[n-1]+e[n-2]}；
wherein, Δ u [ n ]]Representing incremental valve action, KpRepresents the proportionality coefficient, e [ n ]]Representing the controlled variable at time n, n representing a discrete independent variable, KiRepresents an integral coefficient, and
Kdrepresents a differential coefficient, and
t represents the sampling period, TiRepresents the integration time constant, TdRepresenting the differential time constant.
5. A flow control method based on an intelligent metering valve as set forth in claim 3 wherein: in step S3, after obtaining a locally set valve action increment and a corresponding valve action, establishing a valve increment action correspondence table, searching for a corresponding valve action from the valve increment action correspondence table according to the valve action increment, and controlling a flow according to the valve action, the method further includes the steps of obtaining a current valve action amplitude in real time, determining a final valve action amplitude according to the valve action increment and the current valve action amplitude, controlling the valve according to the valve action, recording an action amplitude when the valve stops in real time, comparing the action amplitude with the final valve action amplitude, and controlling the flow according to a comparison result.
6. A flow control method based on an intelligent metering valve as set forth in claim 5 wherein: comparing the action amplitude with the final action amplitude of the valve, and controlling the flow according to the comparison result, and further comprising the following steps of comparing the action amplitude with the final action amplitude of the valve, calculating a deviation value between the action amplitudes when the action amplitude is different from the final action amplitude of the valve, re-determining the action quantity of the valve according to the deviation value, and controlling the valve; and when the action amplitude is the same as the final action amplitude of the valve, detecting the current regulated flow value.
7. A flow control method based on an intelligent metering valve as set forth in claim 6 wherein: when the action amplitude is the same as the final action amplitude of the valve, detecting the flow value at the moment, and further comprising the following steps of setting a flow balance state ratio, extracting a maximum flow value and a minimum flow value from the regulated flow value, calculating the ratio between the maximum flow value and the minimum flow value, comparing the ratio with the flow balance state ratio, and waiting for a flow control instruction again when the ratio is the same as the flow balance state ratio; and when the ratio is different from the flow balance state ratio, controlling the flow again according to the regulated flow value through a PID control algorithm.
8. The flow control method device based on the intelligent metering valve is characterized by comprising the following steps:
the monitoring module is used for monitoring the flow value in real time, acquiring the flow real-time value and determining the flow value to be calculated according to the flow real-time value;
the calculation module is used for establishing a PID control algorithm, calculating the flow value to be calculated according to the PID control algorithm and acquiring the valve action increment;
and the control module is used for acquiring locally set valve action increment and corresponding valve action, establishing a valve increment action corresponding table, searching corresponding valve action from the valve increment action corresponding table according to the valve action increment, and controlling the flow according to the valve action.
9. An apparatus, characterized in that the apparatus comprises: memory, a processor and an intelligent metering valve based flow control method program stored on the memory and executable on the processor, the intelligent metering valve based flow control method program configured to implement the steps of the intelligent metering valve based flow control method of any of claims 1 to 7.
10. A medium, characterized in that the medium is a computer medium having stored thereon a program of an intelligent metering valve based flow control method, which when executed by a processor implements the steps of the intelligent metering valve based flow control method according to any of claims 1 to 7.
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