CN104792379B - A kind of Coriolis flowmeter amplitude self-adaptation control method based on fluid state detection - Google Patents
A kind of Coriolis flowmeter amplitude self-adaptation control method based on fluid state detection Download PDFInfo
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- CN104792379B CN104792379B CN201510164860.3A CN201510164860A CN104792379B CN 104792379 B CN104792379 B CN 104792379B CN 201510164860 A CN201510164860 A CN 201510164860A CN 104792379 B CN104792379 B CN 104792379B
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Abstract
The invention discloses a kind of Coriolis flowmeter amplitude self-adaptation control method based on fluid state detection.The arrival end installation ultrasonic transducer of Coriolis flowmeter measurement pipe, attenuation using impurity such as bubbles to ultrasonic signal, judge whether the amplitude of reception signal undergos mutation by threshold comparator detection, obtain whether fluid state contains impurity, and then PID and fuzzy amplitude controller switching is fixed.The detection that the inventive method passes through convection body state, its high-precision static control performance can be kept by Switched adaptive control device, and can improves system dynamic responding speed, avoid measurement pipe failure of oscillation, and quick reconstruction of stability vibration, strengthen the adaptivity of Coriolis flowmeter measurement pipe amplitude controlling, improve reliability and metering performance of the Coriolis flowmeter under complex working condition.
Description
Technical field
The present invention relates to a kind of Coriolis flowmeter control method, more particularly to a kind of Coriolis stream based on fluid state detection
Gauge amplitude self-adaptation control method.
Background technology
Coriolis flowmeter have high accuracy, wide-range ratio, it is reproducible the characteristics of, represent direct-type mass flow measurement
The highest level of technology, it is widely used in industrial circles such as oil, chemical industry, pharmacy, food, Trade Measures.Its operation principle
It is that the caused Coriolis force directly proportional to mass flow, is directly surveyed when being flowed using fluid in the pipeline of vibration
Measure mass flow.
Coriolis flowmeter is the vibration work based on measurement pipe, and industrial quarters is it is believed that the amplitude of measurement tube vibration is steady
The fixed accurate measurement to Coriolis flowmeter has material impact.In Coriolis flowmeter site of deployment, it was also found that fluid state changes
The change of measurement pipe vibration damping can be caused by becoming (being such as changed into two phase flow from single-phase flow), destroy the amplitude stability of measurement pipe, and then
Reduce the measuring accuracy of Coriolis flowmeter.But in the various application occasions of Coriolis flowmeter, inevitably often occur
Bubble stream (being mixed into bubble in liquid) is mixed into other solids, and now measurement pipe vibrational system damping can increase one to two
The individual order of magnitude, and acutely bounce occurs.Generally using positive feedback drive circuit as measurement pipe vibrational system in Coriolis flowmeter
Drive scheme, i.e., measurement pipe vibration signal is multiplied by after a driving gain K directly as drive signal, thus measurement pipe
The key of amplitude controlling is the determination for driving gain K.Driving gain K is made with the deviation of vibration signal amplitude and setting amplitude
For input signal, obtained afterwards via amplitude controller computing.Amplitude control method the most frequently used at present is fixed PID controls
System, single in fluid media (medium), during the parameter stability of measurement pipe vibrational system, fixed PID control can obtain highly stable amplitude,
Ensure the high-precision advantage of Coriolis flowmeter.But change in fluid state, when the parameter of measurement pipe vibrational system changes, Gu
Determine PID control and can not be maintained at optimal control performance the stabilization time, it is necessary to longer, in the case where changing greatly, even
Occur after measurement pipe failure of oscillation can not starting of oscillation again, so as to cause the situation that Coriolis flowmeter fails.
Change the fast-changing situation of parameter for causing measurement pipe vibrational system, existing solution for fluid state
It is fuzzy amplitude control method.This method is real with reference to the experience of adjusting of industrial quarters pid parameter according to the change of vibration amplitude
When adjust pid parameter, responded with the Parameters variation to measurement pipe vibrational system, avoid the failure of oscillation of measurement pipe, and make to shake
The fast quick-recovery of width is stable, improves Coriolis flowmeter in bubble stream or containing the reliability and measuring accuracy in the case of other impurity.But
It is fuzzy-adaptation PID control in the case where measurement pipe Vibration Parameters are stable, compared with fixed PID control, on the one hand can causes
The frequent bounce of pid parameter, the steady-state behaviour of amplitude controlling is reduced, the metering to Coriolis flowmeter adversely affects, and weakens
Its high-precision advantage；On the other hand, fuzzy PID control method needs that pid parameter is calculated and adjusted in real time, to system
Data calculate and data storage capacities require high, and long luck guild dramatically increases system power dissipation, improves the application of Coriolis flowmeter
Cost.
The content of the invention
In order to obtain the amplitude stability of Coriolis flowmeter measurement pipe under complex fluid state, the invention provides one kind to be based on
The Coriolis flowmeter amplitude self-adaptation control method of fluid state detection, different amplitude controls is used for different fluid states
Method processed, strengthen the adaptivity of amplitude controlling, while the high-precision advantage of Coriolis flowmeter under keeping stable state, improve it
Dynamic response performance, improve reliability and metering performance of the Coriolis flowmeter under complex working condition.
The step of the technical solution adopted for the present invention to solve the technical problems, is as follows：
1) fluid state detection means, convection body are installed between the arrival end and fluid line of Coriolis flowmeter measurement pipe
State is detected；Fluid state detection means compares comprising liquid ultrasonic wave launcher, liquid ultrasonic receiver and threshold value
Device, liquid ultrasonic wave launcher, liquid ultrasonic receiver are separately mounted to install the symmetrical both sides of pipeline section, and liquid ultrasonic connects
Receive device connection threshold comparator；
2) liquid ultrasonic wave launcher transmitting ultrasonic wave through installation pipeline section in fluid after by liquid ultrasonic receiver
Receive, compare whether detection ultrasonic wave reception signal amplitude undergos mutation by threshold comparator, the fluid if not undergoing mutation
In do not contain impurity, if containing impurity in fluid if undergoing mutation；
3) in real time according to the fluid state of above-mentioned steps whether the result containing impurity, PID is fixed and is shaken with fuzzy
The real-time switching of width controller, realize flowmeter amplitude Self Adaptive Control.
Impurity includes bubble or solids in described fluid.
When within a ultrasonic signal cycle, rising edge, expression flow-like occurs in the threshold comparator output signal
State is stable state, and ultrasonic wave reception signal amplitude, which is not undergone mutation, does not contain impurity wherein；When at least one ultrasonic signal week
In phase, the threshold comparator output signal does not occur rising edge, and ultrasonic wave reception signal amplitude is undergone mutation wherein containing miscellaneous
Matter.
Step 2) the threshold comparator uses analog single threshold comparator.
The end of oppisite phase of described threshold voltage access threshold comparator, ultrasonic wave reception signal access the same of threshold comparator
Xiang Duan.
The switching mode of amplitude controller is specific as follows in the step 3)：If detection obtains containing impurity in fluid,
The mode of operation of single-chip microcomputer is switched to fuzzy amplitude controller；If detection obtains not containing impurity in fluid；Then by monolithic
The mode of operation of machine is switched to fixed PID amplitude controllers.
Described threshold comparator is connected with single-chip microcomputer, and single-chip microcomputer is connected with the judgement of ultrasonic wave reception signal amplitude
The timer of cycle timing, single-chip microcomputer are connected through drive module with the control terminal of Coriolis flowmeter measurement pipe, and single-chip microcomputer is by switching
Controller produce driving gain signal and be sent to Coriolis flowmeter measurement pipe and be controlled.
The present invention has an advantageous effect in that compared with background technology：
The present invention is in Coriolis flowmeter measurement pipe inlet upstream using a pair of liquid ultrasonic wave transducers to fluids within pipes
State is detected, and ultrasonic wave reception signal is handled and compared using threshold comparator, convection body state is prejudged.
When fluid is the impurity such as stable state bubble-free, carried out using the fixation PID controller for adjusting to obtain under Steady Experimental
Amplitude controlling, obtain the high-precision control performance under stable state；When containing the impurity such as bubble in fluid, emulated using bubble stream excellent
Change obtained fuzzy controller and carry out amplitude controlling, improve system dynamic responding speed, avoid the failure of oscillation of measurement pipe, and soon
Fast reconstruction of stability vibration.
The inventive method enhances the adaptivity of Coriolis flowmeter measurement pipe amplitude controlling, improves Coriolis flowmeter and exists
Reliability and metering performance under complex working condition.
Brief description of the drawings
Fig. 1 is the fluid state detection means scheme of installation of the present invention.
Fig. 2 is the ultrasound examination schematic diagram of the fluid state of the present invention.
Fig. 3 is the amplitude self-adaptation control method flow chart of the present invention.
In figure：1st, fluid line；2nd, fluid state detection means；3rd, Coriolis flowmeter measurement pipe；4th, bubble；5th, threshold value ratio
Compared with device；6th, single-chip microcomputer；7th, timer；2_1, installation pipeline section；2_2, liquid ultrasonic wave launcher；2_3, liquid ultrasonic receive
Device；2_4, pad.
Embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
The inventive method comprises the following steps：
1) as shown in figure 1, installing fluid state inspection between the arrival end and fluid line 1 of Coriolis flowmeter measurement pipe 3
Device 2 is surveyed, convection body state is detected；As shown in Fig. 2 fluid state detection means 2 includes liquid ultrasonic wave launcher 2_
2nd, liquid ultrasonic receiver 2_3 and threshold comparator 5,2_3 points of liquid ultrasonic wave launcher 2_2, liquid ultrasonic receiver
The symmetrical both sides of pipeline section 2_1, liquid ultrasonic receiver 2_3 connections threshold comparator 5 An Zhuan be installed；Threshold comparator 5
Single-chip microcomputer is connected, single-chip microcomputer is connected with timer, and control terminal of the single-chip microcomputer through drive module and Coriolis flowmeter measurement pipe 3 connects
Connect, liquid ultrasonic wave launcher 2_2, liquid ultrasonic receiver 2_3 are arranged on installation pipeline section 2_1 both sides by pad 2_4
In endoporus；
2) liquid ultrasonic wave launcher 2_2 transmitting ultrasonic wave through installation pipeline section 2_1 in fluid after by liquid ultrasonic
Receiver 2_3 is received, and compares whether detection ultrasonic wave reception signal amplitude undergos mutation by threshold comparator 5, ultrasonic wave warp
After impurity decay ultrasonic wave reception signal amplitude can be caused to change in fluid and then judge wherein whether contain impurity；If not
Undergo mutation, impurity is not contained in fluid, if containing impurity in fluid if undergoing mutation；Impurity refers to possibility in its fluid
Including bubble or solids.
Whether the ultrasonic wave reception signal of the present invention, which undergos mutation, to be judged by rising edge, in the event of rising
Edge, amplitude are unmutated；If occurring without rising edge, signal amplitude diminishes, and is mutated.
Fluid state detection means 2 of the present invention includes a liquid ultrasonic wave launcher and a liquid ultrasonic receives
Device, they are arranged on the arrival end upstream of Coriolis flowmeter measurement pipe 3；The ultrasonic wave of liquid ultrasonic wave launcher transmitting is uniform
Being propagated in the liquid of density does not almost have energy loss, and the impurity such as bubble or other particles has decay to make to ultrasonic signal
With the reduction suddenly of ultrasonic wave reception signal amplitude can be caused.
Preferable threshold comparator 5 uses analog single threshold comparator.Threshold voltage accesses the anti-phase of threshold comparator 5
End, its threshold voltage is compromised by the amplitude of steady-state fluid experiment and ultrasonic wave reception signal in bubbles fluid experiment to be determined.It is super
Acoustic receiver signal accesses the in-phase end of threshold comparator 5；When ultrasonic wave reception signal is higher than threshold voltage, threshold comparator
5 output high level, otherwise output low level.
When within a ultrasonic signal cycle, rising edge occurs in the output signal of threshold comparator 5, expression fluid state is
Stable state, do not undergo mutation and do not contain impurity wherein；When within least one ultrasonic signal cycle, threshold comparator output signal
5 be always low level, does not occur rising edge, undergos mutation and wherein contain impurity.
3) in real time according to the fluid state of above-mentioned steps whether the result containing impurity, PID is fixed and is shaken with fuzzy
The real-time switching of width controller, realize flowmeter amplitude Self Adaptive Control.
The switching mode of amplitude controller is specific as follows in step 3：If detection obtains containing impurity in fluid, by monolithic
The mode of operation of machine is switched to fuzzy amplitude controller, i.e., within a ultrasonic signal cycle, threshold comparator 5 exports
Signal does not occur rising edge, switches to fuzzy amplitude controller at once during the end cycle, its parameter is by imitating bubble stream
True optimization obtains；If detection obtains not containing impurity in fluid；The mode of operation of single-chip microcomputer is then switched to fixed PID amplitudes control
Device processed, i.e., within a ultrasonic signal cycle, there is rising edge in the output signal of threshold comparator 5, during the end cycle at once
Fixed PID amplitude controllers are switched to, its parameter is obtained by being adjusted under Steady Experimental.
Attenuation of the present invention based on impurity such as bubbles to ultrasonic wave, is carried out by ultrasonic transducer convection body state
Detection；Transducer receiving end signal is handled and compared with threshold comparator, judges whether contain bubble in fluid；According to
The result of determination of fluid state, switch different amplitude control methods.
The control process of the inventive method is as shown in Figure 3：1. Coriolis flowmeter measurement pipe amplitude control system completes system
System initialization, timer are initialized after n=N；(N=ultrasonic signal cycle times and time Singlechip clock signal period
Ratio)
2. from measurement pipe vibration signalRead vibration amplitude in place；3. and then reading comparator is defeated at threshold comparator 5
Go out；4. and carry out judging that signal is rising edge：5. if signal is rising edge, timer resets, n=N；If 6. do not rise
Along the counting n=n-1 of signal, then timer.7. continue to judge whether n meets n in the following ways>0：
If 8. n>0, then judge that fluid is stable state, 9. enables fixed PID controller simultaneously,Obtain driving gain K；Or
Say, if 10. n≤0, judge there is bubble in fluid,Fuzzy controller is enabled simultaneously,Obtain driving gain K.Then
Driving gain K is passed into measurement pipe positive feedback drive circuit,Finally give the measurement pipe vibration signal after modulation.
The specific embodiment and implementation process of the present invention is as follows：
As shown in figure 1, Coriolis flowmeter measurement pipe 3 uses double-U-shaped measurement pipe, a diameter of 6mm of single tube, threshold in specific implementation
It is worth comparator 5 and uses analog single threshold comparator, flow-like is installed between fluid line 1 and Coriolis flowmeter measurement pipe 3
State detection means 2, fluids within pipes state is detected before fluid enters Coriolis flowmeter measurement pipe, is Coriolis flow
Meter provides fluid state anticipation information.
As shown in Fig. 2 fluid state detection means 2 includes installation pipeline section 2_1, liquid ultrasonic wave launcher 2_2 and liquid
Ultrasonic receiver 2_3.Liquid ultrasonic wave launcher 2_2 and liquid ultrasonic receiver 2_3 by a manner of penetrating in installation pipeline section
It is symmetrically installed on 2_1, is coupled by taper thread.Liquid ultrasonic wave launcher 2_2 launches ultrasonic signal, passes over fluid Jie
Liquid ultrasonic receiver 2_3 is eventually arrived at after matter.Ultrasonic wave reception signal then accesses the in-phase end of threshold comparator 5, threshold value
Voltage VTAccess the end of oppisite phase of threshold comparator 5, threshold voltage VTFor 0.8V：When bubble-free 4 in fluid, ultrasonic wave reception signal
Peak value is that 1V is more than threshold voltage VT0.8V, threshold comparator 5 exports high level, high level signal 3V, when going out in fluid
During existing bubble 4, ultrasonic wave reception signal peak value is less than threshold voltage VT0.8V, threshold comparator 5 persistently exports low level, low
Level signal is 0V.Single-chip microcomputer 6 samples in the presence of clock signal to the output signal of threshold comparator 5, works as appearance
During signal rising edge, timer 7 is resetted, otherwise the counter of timer 7 subtracts one.When occurring bubble 4 in fluid, at one section
All there is no rising edge in the output signal of interior threshold comparator 5, the count value of timer 7 reduces to 0, is determined with bubble 4 and occurs,
Amplitude control method switches to fuzzy-adaptation PID control.
For synthesis, the present invention use a pair of liquid ultrasonic wave transducers, fluid into Coriolis flowmeter measurement pipe it
Bubble in preceding convection body carries out detection and provides anticipation, realizes the timely switching of Coriolis flowmeter measurement pipe amplitude control method,
The adaptivity of Coriolis flowmeter measurement pipe amplitude controlling is enhanced, improves reliability of the Coriolis flowmeter under complex working condition
With metering performance, there is prominent technique effect.
Above-mentioned embodiment is used for illustrating the present invention, rather than limits the invention, the present invention's
In spirit and scope of the claims, to any modifications and changes of the invention made, protection model of the invention is both fallen within
Enclose.
Claims (7)
1. a kind of Coriolis flowmeter amplitude self-adaptation control method based on fluid state detection, it is characterised in that this method is such as
Under：
1) fluid state detection means (2) is installed between the arrival end and fluid line (1) of Coriolis flowmeter measurement pipe (3),
Convection body state is detected；Fluid state detection means (2) includes liquid ultrasonic wave launcher (2_2), liquid ultrasonic connects
Receive device (2_3) and threshold comparator (5), liquid ultrasonic wave launcher (2_2), liquid ultrasonic receiver (2_3) are installed respectively
In installation pipeline section (2_1) symmetrical both sides, liquid ultrasonic receiver (2_3) connection threshold comparator (5)；
2) ultrasonic wave of liquid ultrasonic wave launcher (2_2) transmitting after the fluid in installation pipeline section (2_1) by liquid ultrasonic
Receiver (2_3) receives, and compares whether detection ultrasonic wave reception signal amplitude undergos mutation by threshold comparator, if not occurring
Mutation does not then contain impurity in fluid, if containing impurity in fluid if undergoing mutation；
3) in real time according to the fluid state of above-mentioned steps whether the result containing impurity, PID and fuzzy amplitude control is fixed
The real-time switching of device processed, realize flowmeter amplitude Self Adaptive Control.
2. a kind of Coriolis flowmeter amplitude self-adaptation control method based on fluid state monitoring according to claim 1,
It is characterized in that：Impurity includes bubble or solids in described fluid.
3. a kind of Coriolis flowmeter amplitude self-adaptation control method based on fluid state monitoring according to claim 1,
It is characterized in that：When within a ultrasonic signal cycle, rising edge occurs in threshold comparator (5) output signal, represent
Fluid state is stable state, and ultrasonic wave reception signal amplitude, which is not undergone mutation, does not contain impurity wherein；When at least one ultrasonic wave
In signal period, the threshold comparator output signal (5) does not occur rising edge, and ultrasonic wave reception signal amplitude undergos mutation it
In contain impurity.
4. a kind of Coriolis flowmeter amplitude self-adaptation control method based on fluid state monitoring according to claim 1,
It is characterized in that：Step 2) the threshold comparator (5) uses analog single threshold comparator.
5. a kind of Coriolis flowmeter amplitude self-adaptation control method based on fluid state monitoring according to claim 1,
It is characterized in that：The end of oppisite phase of threshold voltage access threshold comparator (5), ultrasonic wave reception signal access threshold comparator (5)
In-phase end.
6. a kind of Coriolis flowmeter amplitude self-adaptation control method based on fluid state monitoring according to claim 1,
It is characterized in that：The switching mode of amplitude controller is specific as follows in the step 3)：If detection obtains containing impurity in fluid,
The mode of operation of single-chip microcomputer is then switched to fuzzy amplitude controller；If detection obtains not containing impurity in fluid；Then will be single
The mode of operation of piece machine is switched to fixed PID amplitude controllers.
7. a kind of Coriolis flowmeter amplitude self-adaptation control method based on fluid state monitoring according to claim 1,
It is characterized in that：Described threshold comparator (5) is connected with single-chip microcomputer, and single-chip microcomputer is connected with for ultrasonic wave reception signal amplitude
The timer of cycle timing in judgement, single-chip microcomputer are connected through drive module with the control terminal of Coriolis flowmeter measurement pipe (3), monolithic
Machine is sent to Coriolis flowmeter measurement pipe (3) by the controller generation driving gain signal switched and is controlled.
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| CN106568839A (en) * | 2015-10-13 | 2017-04-19 | 北汽福田汽车股份有限公司 | Method for detecting clutch control system and device thereof |
| CN114633448B (en) * | 2022-03-16 | 2022-11-08 | 浙江大学 | Testing machine with wide-frequency amplitude vibration test/rheological measurement integrated function |
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