CN103893891A - Method for calibrating nonlinear proportional valve of respirator - Google Patents
Method for calibrating nonlinear proportional valve of respirator Download PDFInfo
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- CN103893891A CN103893891A CN201210575951.2A CN201210575951A CN103893891A CN 103893891 A CN103893891 A CN 103893891A CN 201210575951 A CN201210575951 A CN 201210575951A CN 103893891 A CN103893891 A CN 103893891A
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Abstract
The invention discloses a method for calibrating a nonlinear proportional valve of a respirator. The method is achieved through a calibration unit on the respirator, after a proportional valve calibration mode is entered in, the closing effect of the proportional valve is detected first, if the proportional valve passes the detection, calibration is continued, then the calibration unit detects and records the minimum valve opening point voltage value Vmin and the maximum valve opening point voltage value Vmax of the proportional valve, a stepping value f is calculated and recorded, then the calibration unit drives the proportional valve by using the stepping valve f as steeping output drive voltages Vn, the flow values Qn flowing through the proportional valve under all driving voltages Vn are detected through a flow sensor, at last, the calibration unit generates a voltage-flow table according to detected data, the data in the voltage-flow table are fit to be n fitting straight lines to be stored, and calibration is achieved. According to the method, the voltage-flow curve of the nonlinear proportional valve is locally linearized, the voltage-flow relation of the nonlinear proportional valve can be well matched, the calculation process is simplified, and the accuracy of the calibration process is improved.
Description
Technical field
The present invention relates to valve body verification field, relate in particular to a kind of method of calibration of respirator non-linear ratio valve.
Background technology
Proportioning valve is a kind of gas-pressure component of gas parameter with the proportional variation of input electrical signal parameter of exporting, and wherein gas parameter can be pressure, flow and direction, and electric signal parameter can be curtage.Proportioning valve of a great variety, uses extensively.
For easy to use, common voltage-controlled proportioning valve needed the corresponding relation of calibration voltage and flow before using, so that user can be realized the accurate control to flow by the mode of controlling voltage.Whether the accuracy of the verification of proportioning valve, having determined to a great extent can provide gas flow accurately for ventilating return in the use procedure of proportioning valve.
In actual use, part proportioning valve manufacturer cannot provide the corresponding relation of voltage and flow, verification in advance before using for this class proportioning valve.In addition, because proportioning valve is along with its voltage-flow curve of accumulation of working time can change, even manufacturer provides the corresponding relation of voltage and flow, also need comparative example valve periodic check.
Can be divided into linear scale valve and non-linear ratio's valve two classes according to voltage-flow curve type of proportioning valve.For the verification of the valve of ratio, often adopt the form of single equation a few days ago, this mode is well positioned to meet the calibration of linear scale valve, but for non-linear ratio's valve, due to the corresponding relation complexity of voltage and flow, be difficult to describe with single equation, adopt this method to be difficult to realize the accurate verification of non-linear ratio's valve.
Summary of the invention
Be difficult to meet the accurate verification of non-linear ratio's valve in order to overcome existing proportioning valve method of calibration, the defects such as checking procedure complexity is loaded down with trivial details, technical problem to be solved by this invention is to propose a kind of method of calibration of respirator non-linear ratio valve, by by voltage-flow curve local linearization of non-linear ratio's valve, voltage-the discharge relation of non-linear ratio's valve can well coincide, simplify again computational process, improved the accuracy of checking procedure.
For reaching this object, the present invention by the following technical solutions:
A method of calibration for respirator non-linear ratio valve, implement as follows:
S00: respirator is set, enters proportioning valve calibration pattern;
S10: described proportioning valve is closed in calibration unit, now flow transducer detects the gas flow value of the described proportioning valve of flowing through, if described gas flow value is less than/equals predetermined critical, enter S20 step, calibration continues, if described gas flow value is greater than described predetermined critical, enter S60 step, calibration finishes;
S20: valve point flow value Q is opened according to the minimum of described proportioning valve in described calibration unit
mindetect and record the minimum of described proportioning valve and open valve point magnitude of voltage V
min;
S30: valve point flow value Q is opened according to the maximum of described proportioning valve in described calibration unit
maxdetect and record the maximum of described proportioning valve and open valve point magnitude of voltage V
max;
S40: described calibration unit calculates and record the driving voltage step value f of described proportioning valve, described calibration unit is taking described step value f as stepping outputting drive voltage V
n, described driving voltage V
ndrive described proportioning valve, described calibration unit record driving voltage V
nthe flow value Q of described proportioning valve flows through under effect
n;
S50: described calibration unit formation voltage-flow meter, and according to described voltage-flow meter described point, by adjacent two numerical point (V
n, Q
n) and (V
n+1, Q
n+1) fit to n bar fitting a straight line, described calibration unit storage n bar fitting a straight line equation;
S60: calibration finishes.
Further, described calibration unit is connected with described flow transducer and described proportioning valve, and described flow transducer and described proportioning valve are located on same respiration channel.
Further, in step S10, described calibration unit is exported 0 volt of voltage and is driven described proportioning valve to close.
Further, in step S30, described maximum is opened valve point flow value Q
maxpeak flow values-the predetermined offset value of=described proportioning valve.
Further, in step S20, described minimum is opened valve point flow value Q
minsize equal the size of preset critical described in S10 step.
Further, in step S40, the computing formula of described step value f is as follows:
Wherein, V
min-minimum is opened valve point magnitude of voltage, V
max-maximum is opened valve point magnitude of voltage, n-isodisperse, and described isodisperse is consistent with the number of described fitting a straight line.
Further, in step S40, open valve point magnitude of voltage L from described minimum
minstart, described calibration unit is taking described step value f as stepping outputting drive voltage V
n, to described driving voltage value V
nequal maximum and open valve point magnitude of voltage V
maxin time, finishes.
Further, described fitting a straight line equation is as follows:
Wherein, the required gas flow value of Use of respirator person described in y-, described proportioning valve driving voltage value corresponding to gas flow value that x-is required with described Use of respirator person, V
nthe driving voltage value that in-described voltage-flow meter, n is ordered, Q
nthe flow value that in-described voltage-flow meter, n is ordered, V
n+1the driving voltage value that in-described voltage-flow meter, n+1 is ordered, Q
n+1the flow value that in-described voltage-flow meter, n+1 is ordered.
Further, for the described proportioning valve in described respirator, described predetermined offset value is 25ml/s.
Further, for the described proportioning valve in described respirator, described predetermined critical is 10ml/s.
Beneficial effect of the present invention is: the method is passed through voltage-flow curve local linearization of non-linear ratio's valve, voltage-flow combination the curve that adopts the mode of matching to obtain being formed by many fitting a straight lines, can well the coincide voltage-discharge relation of non-linear ratio's valve of this curve, can simplify again the troublesome calculation process that nonlinear curve solves, not only strengthen the accuracy of proportioning valve checking procedure, and improved the convenience of the actual use procedure of voltage-flow curve.
Brief description of the drawings
Fig. 1 is the flow chart of the method for calibration of a kind of respirator non-linear ratio valve of providing of the specific embodiment of the invention.
Fig. 2 is the annexation figure of the device of the method for calibration that realizes a kind of respirator non-linear ratio valve that provides of the specific embodiment of the invention.
Detailed description of the invention
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing and by detailed description of the invention.
Fig. 1 is the flow chart of the method for calibration of a kind of respirator non-linear ratio valve of providing of the specific embodiment of the invention.
A method of calibration for respirator non-linear ratio valve, implement as follows:
S00 step: respirator is set, enters proportioning valve calibration pattern.
S10 step: calibration unit inspection proportioning valve close effect.
Close effect determining method as follows:
Calibration unit is exported 0 volt of voltage and is driven proportioning valve, if flow transducer detect when the gas flow of the proportioning valve of flowing through is greater than predetermined critical, assert that described proportioning valve is defective, proportioning valve valve cannot shut, enter S60 step, calibration finishes, and this respirator need to be with changing proportioning valve; If flow transducer detects when the gas flow of the proportioning valve of flowing through is less than or equal to predetermined critical, assert that described proportioning valve is qualified, enter S20 step, calibration continues.
In theory, when 0 volt of voltage driving proportioning valve is exported in calibration unit, not have gas flow through this proportioning valve, be that flow transducer cannot detect flow signal, do not need strict implement theory relation standard but proportioning valve shuts criterion in actual use, normally, according to the default some values of the actual service condition of respirator proportioning valve, then carry out the above-mentioned effect determining method of closing and judge whether proportioning valve valve shuts, adopt in this way, be conducive to improve the utilization rate of proportioning valve.For the proportioning valve in respirator, predetermined critical is generally 10ml/s.
S20 step: detect and record minimum and open valve point magnitude of voltage V
min.
As shown in Figure 2, calibration unit is connected with flow transducer and proportioning valve, and flow transducer and proportioning valve are located on same respiration channel.Minimum is opened valve point flow value Q
minsize equal the big or small 10ml/s of predetermined critical, in the time that the gas flow of the proportioning valve of flowing through reaches predetermined critical, think proportioning valve valve open, predetermined critical 10ml/s is valve open or the critical point of closing.
Calibration unit is by the flow through gas flow of proportioning valve of flow transducer Real-Time Monitoring, and the driving voltage of control ratio valve increases gradually since 0 volt, increases gradually the gas flow of the proportioning valve of flowing through.When reaching minimum, the gas flow value of the proportioning valve of flowing through opens valve point flow value Q
mintime, calibration unit inspection also records the now minimum of proportioning valve and opens valve point magnitude of voltage V
min, obtain minimum and open valve point magnitude of voltage V
min=0.3 volt.
S30 step: detect and record maximum and open valve point magnitude of voltage V
max.
Calibration unit drives proportioning valve with maximum voltage, flow transducer detects the flow value of the proportioning valve of now flowing through, and the peak flow values that this flow value is proportioning valve, for the proportioning valve of respirator, maximum voltage is 2.5 volts, and the maximum stream flow that detects the proportioning valve obtaining is 2650ml/s.Determine predetermined offset value according to the operation parameter of proportioning valve and environment, for the proportioning valve of respirator, predetermined offset value is 25ml/s.Open valve point flow value Q by formula maximum
maxpeak flow values-the predetermined offset value of=proportioning valve, can try to achieve the maximum of proportioning valve and open valve point flow value Q
maxfor 2650-25=2625ml/s.
Calibration unit is by the flow through gas flow of proportioning valve of flow transducer Real-Time Monitoring, and the driving voltage of control ratio valve is 2.5 volts from maximum voltage and starts to reduce gradually, reduces gradually the gas flow of the proportioning valve of flowing through.Be down to maximum when the gas flow value of the proportioning valve of flowing through and open valve point flow value Q
maxtime, calibration unit inspection also records the now maximum of proportioning valve and opens valve point magnitude of voltage V
max, obtain maximum and open valve point magnitude of voltage V
max=1.75 volts.
S40 step: calibration unit calculates and record the driving voltage step value f of proportioning valve.
Computing formula is as follows:
Wherein, V
min-minimum is opened valve point magnitude of voltage, V
max-maximum is opened valve point magnitude of voltage, n-isodisperse, and described isodisperse is consistent with the number of described fitting a straight line.
Isodisperse n determines.Isodisperse n is definite according to flow control accuracy in the actual use procedure of proportioning valve, and required precision is higher, and isodisperse n is larger, for the proportioning valve of respirator, conventionally gets n=40.Can try to achieve thus step value f=0.036.
Open valve point magnitude of voltage V from minimum
minstart, calibration unit is taking step value f as stepping outputting drive voltage V
n, to driving voltage value V
nequal maximum and open valve point magnitude of voltage V
maxin time, finishes.Driving voltage V
ndrive proportioning valve, each driving voltage of calibration unit record V
nthe flow value Q of proportioning valve flows through under effect
n.
S50 step: calibration unit is according to the driving voltage value V gathering in step S40
nwith flow value Q
nformation voltage-flow meter, in table 1, voltage-flow meter is as follows:
| Count | Driving voltage (V) | Flow value (ml/s) |
| 1 | 0.3 | 10 |
| 2 | 0.35 | 73 |
| 3 | 0.40 | 130 |
| 4 | 0.45 | 185 |
| 5 | 0.5 | 246 |
| …… | …… | …… |
| 36 | 1.55 | 2345 |
| 38 | 1.60 | 2417 |
| 39 | 1.65 | 2483 |
| 40 | 1.70 | 2570 |
| 41 | 1.75 | 2625 |
Table 1
According to voltage-flow meter described point, described point is convenient explanation fitting a straight line process just, and in actual program, computer is described point not, also can show voltage-flow curve figure by display screen by described point, by adjacent two numerical point (V
n, Q
n) and (V
n+1, Q
n+1) fit to n bar fitting a straight line by linear equation, because isodisperse n is 40, therefore finally fit to 40 curves.
Fitting a straight line equation is as follows:
Wherein, the required arbitrary flow value of Use of respirator person described in y-, described proportioning valve driving voltage value corresponding to gas flow value that x-is required with described Use of respirator person, V
nthe driving voltage value that in-described voltage-flow meter, n is ordered, Q
nthe flow value that in-described voltage-flow meter, n is ordered, V
n+1the driving voltage value that in-described voltage-flow meter, n+1 is ordered, Q
n+1the flow value that in-described voltage-flow meter, n+1 is ordered.
As: the 4th point (V in showing
4=0.45V, Q
4=185ml/s) and the 5th point (V
s=0.50V, Q
5=246ml/s) data substitution fitting a straight line equation, obtain the 4th article of fitting a straight line as follows:
y=1220·(x-0.45)+185
The whole straight lines of matching as stated above, whole fitting a straight line equations are stored in calibration unit, totally 40.
S60 step: calibration finishes.
The use of Calibration Data, in the time that user needs arbitrary flow value y, as ventilated at VCV(volume control) in, in whole breathing process, all need the flow velocity that provides constant, be that same ducted flow value is constant, now need to determine driving voltage value x according to arbitrary flow value y.The process that arbitrary flow value y determines driving voltage value x is as follows:
First look into voltage-flow meter according to arbitrary flow y value, if comprise the flow value equating with arbitrary flow value y in table, in table, magnitude of voltage corresponding to this flow value is the driving voltage value x that user needs, drive proportioning valve with this driving voltage x, the flow of the proportioning valve of flowing through is user needs arbitrary flow value y; If do not comprise the flow value equating with arbitrary flow value y in table, two flow values adjacent with arbitrary flow value y in first look-up table, as find out flow value Q adjacent with arbitrary flow value y in table
nand Q
n+1, determine n value, by the n article of linear equation recording in y substitution calibration unit, just can obtain the driving voltage value x that user needs, drive proportioning valve with this driving voltage x, the flow of the proportioning valve of flowing through is user needs arbitrary flow value y.
Be exemplified below: arbitrary flow value y=200ml/s;
Table look-up one, due to 185 < 200 < 246, in table, between the 4th and the 5th, determine n=4;
By in the 4th article of linear equation recording in y=200ml/s substitution calibration unit, in the embodiment of Article 4 equation step S50, to try to achieve, equation is as follows:
y=1220·(x-0.45)+185
Obtain the driving voltage value x=0.463V that user needs, drive proportioning valve with this driving voltage, the flow of the proportioning valve of flowing through is user needs arbitrary flow value 200ml/s.
The present invention is described by preferred embodiment, and those skilled in the art know, without departing from the spirit and scope of the present invention, can carry out various changes or equivalence replacement to these features and embodiment.The present invention is not subject to the restriction of specific embodiment disclosed herein, and other embodiment that fall in the application's claim belong to the scope of protection of the invention.
Claims (10)
1. a method of calibration for respirator non-linear ratio valve, is characterized in that, implements as follows:
S00: respirator is set, enters proportioning valve calibration pattern;
S10: described proportioning valve is closed in calibration unit, now flow transducer detects the gas flow value of the described proportioning valve of flowing through, if described gas flow value is less than/equals predetermined critical, enter S20 step, calibration continues, if described gas flow value is greater than described predetermined critical, enter S60 step, calibration finishes;
S20: valve point flow value Q is opened according to the minimum of described proportioning valve in described calibration unit
mindetect and record the minimum of described proportioning valve and open valve point magnitude of voltage V
min;
S30: valve point flow value Q is opened according to the maximum of described proportioning valve in described calibration unit
maxdetect and record the maximum of described proportioning valve and open valve point magnitude of voltage V
max;
S40: described calibration unit calculates and record the driving voltage step value f of described proportioning valve, described calibration unit is taking described step value f as stepping outputting drive voltage V
n, described driving voltage V
ndrive described proportioning valve, described calibration unit record driving voltage V
nthe flow value Q of described proportioning valve flows through under effect
n;
S50: described calibration unit formation voltage-flow meter, and according to described voltage-flow meter described point, by adjacent two numerical point (V
n, Q
n) and (V
n+1, Q
n+1) fit to n bar fitting a straight line, described calibration unit storage n bar fitting a straight line equation;
S60: calibration finishes.
2. method of calibration according to claim 1, is characterized in that, described calibration unit is connected with described flow transducer and described proportioning valve, and described flow transducer and described proportioning valve are located on same respiration channel.
3. method of calibration according to claim 1, is characterized in that, in step S10, described calibration unit is exported 0 volt of voltage and driven described proportioning valve to close.
4. method of calibration according to claim 1, is characterized in that, in step S30, described maximum is opened valve point flow value Q
maxpeak flow values-the predetermined offset value of=described proportioning valve.
5. method of calibration according to claim 1, is characterized in that, in step S20, described minimum is opened valve point flow value Q
minsize equal the size of preset critical described in S10 step.
6. method of calibration according to claim 1, is characterized in that, in step S40, the computing formula of described step value f is as follows:
Wherein, V
min-minimum is opened valve point magnitude of voltage, V
max-maximum is opened valve point magnitude of voltage, n-isodisperse, and described isodisperse is consistent with the number of described fitting a straight line.
7. according to the method for calibration described in claim 1 or 6, it is characterized in that, in step S40, open valve point magnitude of voltage V from described minimum
minstart, described calibration unit is taking described step value f as stepping outputting drive voltage V
n, to described driving voltage value V
nequal maximum and open valve point magnitude of voltage V
maxin time, finishes.
8. method of calibration according to claim 1, is characterized in that, described fitting a straight line equation is as follows:
Wherein, the required gas flow value of Use of respirator person described in y-, described proportioning valve driving voltage value corresponding to gas flow value that x-is required with described Use of respirator person, V
nthe driving voltage value that in-described voltage-flow meter, n is ordered, Q
nthe flow value that in-described voltage-flow meter, n is ordered, V
n+1the driving voltage value that in-described voltage-flow meter, n+1 is ordered, Q
n+1the flow value that in-described voltage-flow meter, n+1 is ordered.
9. method of calibration according to claim 4, is characterized in that, for the described proportioning valve in described respirator, described predetermined offset value is 25ml/s.
10. method of calibration according to claim 1 or 5, is characterized in that, for the described proportioning valve in described respirator, described predetermined critical is 10ml/s.
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| CN106693128A (en) * | 2015-07-14 | 2017-05-24 | 北京谊安医疗系统股份有限公司 | Flow control method of breathing machine proportional valve |
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| CN106880896A (en) * | 2015-12-15 | 2017-06-23 | 北京谊安医疗系统股份有限公司 | A kind of method of Anesthesia machine IP valves self adaptation calibration |
| CN109237115A (en) * | 2017-07-10 | 2019-01-18 | 青岛经济技术开发区海尔热水器有限公司 | Proportioning valve working range adaptive regulation method and gas heater |
| CN109237115B (en) * | 2017-07-10 | 2022-01-18 | 青岛经济技术开发区海尔热水器有限公司 | Adaptive adjustment method for working range of proportional valve and gas water heater |
| CN108498930A (en) * | 2018-03-31 | 2018-09-07 | 湖南明康中锦医疗科技发展有限公司 | The flow control methods of respiratory assistance apparatus proportioning valve |
| CN112697976A (en) * | 2020-12-18 | 2021-04-23 | 汉威科技集团股份有限公司 | Gas path flow real-time dynamic adjusting method, system and storage medium |
| CN114209955A (en) * | 2021-11-16 | 2022-03-22 | 北京谊安医疗系统股份有限公司 | Proportional valve opening machine self-checking method |
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