CN105842616B - A kind of variable Rate approaches the device and method of detection pressure switch switching value - Google Patents
A kind of variable Rate approaches the device and method of detection pressure switch switching value Download PDFInfo
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- CN105842616B CN105842616B CN201610202573.1A CN201610202573A CN105842616B CN 105842616 B CN105842616 B CN 105842616B CN 201610202573 A CN201610202573 A CN 201610202573A CN 105842616 B CN105842616 B CN 105842616B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The present invention provides the device and method that a kind of variable Rate approaches detection pressure switch switching value, this method is in each detection, by when meeting the switching of this pressure switch state rate of pressure rise or rate of pressure reduction switch from last time pressure switch state when rate of pressure rise or rate of pressure reduction it is different in a manner of obtain upper switching value detected value or lower switching value detected value and corresponding pressure change rate when pressure switch state switches, and the switching value detected value got more than twice recently is obtained into switching value estimated value using fitting method of estimation, when the difference of maxima and minima in the switching value estimated value got more than twice up to date is less than specified amount δ, the switching value estimated value that the last time is obtained is as the switching value of the pressure switch.The device of the invention is easy to use, reliable operation；This method device using the present invention executes, and can improve the accuracy of testing result, ensures repeatability, reduces measurement error, saves detection time.
Description
Technical field
The invention belongs to pressure sensing arts, and in particular to a kind of device and method of detection pressure switch switching value.
Background technology
Pressure switch is a kind of common pressure control valve, when input pressure reaches and (be raised or lowered to) predetermined value
When, the state of switching on-off switches, to send out alarm or control signal.Pressure value when pressure switch switches is known as
Pressure switch switching value, including upper switching value and lower switching value.With the start and stop or supercharging of pressure switch control pressure generating means,
The opening and closing of pressure reducing valve can control the pressure value of pressure system within limits.In the pressure control procedure of industrial circle
In, the accuracy of detection of pressure switch switching value directly affects pressure controling precision, therefore need before use to pressure switch into
Row verification, detects pressure switch switching value.
Common pressure switch has mechanical, electronic type two major classes.The pressure element of electronic pressure switch turns pressure
It is changed to electric signal, becomes digital quantity after signal conditioning circuit, A/D conversions, obtains pressure value after treated device operation, together
When processor pressure value is relatively come to driving switch element (such as mechanical relay, electronic switching element compared with user's setting value
Deng) be switched on or switched off；Pressure conversion is deformation, warp by the pressure element (diaphragm, bellows, piston etc.) of mechanical pressure switch
Mechanical mechanism pushes the on off operating mode of switch element more afterwards.Usual pressure switch all has pipeline input interface end and switching value
Output interface end, wherein pipeline input interface end can connect fluid pressure line or pneumatic circuit, and access is formed with ambient pressure pipeline,
(output type containing break-make, level output type, amount of logic are defeated for the switching value of output switch parameter interface end output pressure switch contact action
Go out type etc.), it is controlled for pressure for the control unit in access industrial control system.
Existing pressure switch detecting system (such as shown in Fig. 3) opens pressure source 100, standard pressure gauge 101 and pressure
It closes 103 and access is formed by the connection of isobaric pipeline 102, on off state acquiring unit 104 is connected in pressure switch 103, is measured
The break-make of 103 contact of pressure switch.
Invention content
In existing pressure switch detecting system shown in Fig. 3, pressure source 100 is slowly boosting and is subtracting to pressure switch 103
Pressure, the method for the artificial listening of process generally use and reading measure, and also useful multimeter measurement switches on-off to sentence
The variation closed is disconnected, number also accurately and is in time read while needing operating personnel to judge switch change in operation
According to the inevitably delay in having time during this, causing the numerical value read, there are large errors with actual value, also very
It is susceptible to the phenomenon that misreading, judging by accident；It boosts when manually reading, operate or the rate of decompression is inconsistent due to causes to detect every time
As a result inconsistent, poor repeatability.
In the pressure switch switching value detection method that existing regulation is previously mentioned, pressure when not detected to switching value becomes
Rate makees quantitative requirement, " slow " description is only used, it is difficult to ensure that the consistency and accuracy of testing result；And existing method
In, generally require the general scope of specified switching value.
The purpose of the present invention is to solve the above problems, provide a kind of high, reproducible, easy to use inspection of accuracy
The method of measuring pressure switching value.
The above-mentioned purpose of the present invention is realized by following technical scheme：
A method of detecting pressure switch switching value with detection device, wherein the detection device includes pressure
Device, pressure sensor and pressure piping are connected pressure generator, pressure sensor and the pressure switch by pressure piping
It is logical, the pressure size in the pressure piping is adjusted by pressure generator, and the on off operating mode of the pressure switch is made to send out
Raw switching, the detection device detect the switching of the pressure switch using the method for the detection pressure switch switching value
The method of value, the detection pressure switch switching value includes the following steps：
Initial value obtaining step obtains pressure value conduct of the pressure switch in boost process when state switching and above cuts
Change value initial value R0And corresponding rate of pressure rise is as rate of pressure rise initial value v10Or pressure switch state is cut in pressure reduction
Pressure value when changing is as lower switching value initial value F0And corresponding rate of pressure reduction is as rate of pressure reduction initial value v20；
Detected value obtaining step obtains pressure value conduct of the pressure switch in boost process when state switching and above cuts
Change value detected value RiAnd corresponding rate of pressure rise v1i, or in pressure reduction state switch when pressure value be used as under switching value
Detected value FiAnd corresponding rate of pressure reduction v2i, wherein i is to measure serial number；
Estimated value obtaining step, the upper switching value including upper switching value initial value that will be got more than twice recently
Detected value or the lower switching value detected value including lower switching value initial value are fitted estimation, obtain the pressure switch
Upper switching value estimated valueOr lower switching value estimated valueWherein, r is estimation number；
Judgment step, by the maximum in the upper switching value estimated value got more than twice recently or lower switching value estimated value
Difference between value and minimum value is compared with specified amount δ, when the difference is greater than or equal to the specified amount δ, is returned
The detected value obtaining step；When the difference is less than the specified amount δ, the upper switching value that the last time obtains is estimated
The upper switching value or lower switching value of evaluation or lower switching value estimated value as the pressure switch.
In the method for above-mentioned detection pressure switch switching value, in the judgment step, the specified amount δ is setting accuracy,
Its value is in the range of 0.2-0.5 times of the pressure switch precision.
In the method for above-mentioned detection pressure switch switching value, in the detected value obtaining step, opened with meeting this pressure
Rate of pressure rise v when rate of pressure rise or rate of pressure reduction when off status switches switch with last time pressure switch state1(i-1)Or decompression
Rate v2(i-1)Different modes obtains upper switching value detected value R when pressure switch switchingiOr lower switching value detected value Fi。
In the method for above-mentioned detection pressure switch switching value, the rate of pressure rise in the detected value obtaining step is expressed as Vij
=θ v1(i-1), wherein VijFor the rate of pressure rise in the i-th detected value obtaining step, v1(i-1)For in the (i-1)-th detected value obtaining step
Rate of pressure rise in acquisition when switching value detected value, θ are speed regulation, and are met, and 0 ＜ θ ＜ 1, i is cycle-index.
In the method for above-mentioned detection pressure switch switching value, the rate of pressure reduction in the detected value obtaining step is expressed as Vij
=θ v2(i-1), wherein VijFor the rate of pressure reduction in the i-th detected value obtaining step, v2(i-1)For in the (i-1)-th detected value obtaining step
Rate of pressure reduction when lower switching value detected value is obtained, θ is speed regulation, and meets 0 ＜ θ ＜ 1, and i is cycle-index.
In the method for above-mentioned detection pressure switch switching value, in the estimated value obtaining step, using based on minimum two
Relationship of the polynomial fitting method multiplied to upper switching value detected value and rate of pressure rise or lower switching value detected value and rate of pressure reduction
It is fitted estimation, and while being zero using rate of pressure rise or rate of pressure reduction corresponding switching value estimated value is as upper switching value estimated value
Or lower switching value estimated value.
In addition, in prior art pressure switch detecting system as shown in Figure 3, there is also pressure sources 100 to give pressure switch
The 103 slow problems boosted and the process of decompression is more time-consuming.The present invention in order to solve detection pressure switch switching value process
Relatively time-consuming technical problem, it is further provided a kind of accuracy is high, reproducible and boosting and/or drop can be rapidly completed
The method for pressing through the detection pressure switch switching value of journey.
It adopts the following technical scheme that achieve the goals above：
A method of detecting pressure switch switching value with detection device, wherein the detection device includes pressure
Device, pressure sensor and pressure piping are connected pressure generator, pressure sensor and the pressure switch by pressure piping
It is logical, the pressure size in the pressure piping is adjusted by pressure generator, and the on off operating mode of the pressure switch is made to send out
Raw switching, the detection device detect the switching of the pressure switch using the method for the detection pressure switch switching value
The method of value, the detection pressure switch switching value includes the following steps：
Initial value obtaining step obtains pressure value conduct of the pressure switch in boost process when state switching and above cuts
Change value initial value R0And corresponding rate of pressure rise is as rate of pressure rise initial value v10Or pressure switch state is cut in pressure reduction
Pressure value when changing is as lower switching value initial value F0And corresponding rate of pressure reduction is as rate of pressure reduction initial value v20；
Detected value obtaining step obtains pressure value conduct of the pressure switch in boost process when state switching and above cuts
Change value detected value RiAnd corresponding rate of pressure rise v1i, or in pressure reduction state switch when pressure value be used as under switching value
Detected value FiAnd corresponding rate of pressure reduction v2i, wherein i is to measure serial number；
Estimated value obtaining step, the upper switching value including upper switching value initial value that will be got more than twice recently
Detected value or the lower switching value detected value including lower switching value initial value are fitted estimation, obtain the pressure switch
Upper switching value estimated valueOr lower switching value estimated valueWherein, r is estimation number；
Judgment step, by the maximum in the upper switching value estimated value got more than twice recently or lower switching value estimated value
Difference between value and minimum value is compared with specified amount δ, when the difference is greater than or equal to the specified amount δ, is returned
The detected value obtaining step；When the difference is less than the specified amount δ, the upper switching value that the last time obtains is estimated
The upper switching value or lower switching value of evaluation or lower switching value estimated value as the pressure switch.
In the detected value obtaining step of above-mentioned detection method, by rate of pressure rise or rate of pressure reduction compared with last time pressure switch state
Rate of pressure rise v when switching1(i-1)Or rate of pressure reduction v2(i-1)Reduce, with after the reduction rate of pressure rise or rate of pressure reduction add one
Speed adjust amount changes the pressure in the pipeline.Speed adjust amount with the pressure value in pressure piping close to last time obtain
The upper switching value detected value including upper switching value initial value or the lower switching value including lower switching value initial value
Detected value and become smaller.
Specifically, in the function that boost process medium-rate adjustment amount is pipeline inner pressure value, the function representation is Δ Vij
=k (Ri-1-pj), the rate of pressure rise is expressed as Vij=θ v1(i-1)+ΔVij, wherein Δ VijFor in the i-th detected value obtaining step
Jth detection step speed adjust amount, VijFor the rate of pressure rise in the i-th detected value obtaining step, v1(i-1)For the (i-1)-th detected value
Rate of pressure rise when upper switching value detected value, R are obtained in obtaining stepi-1It is detected in the (i-1)-th detected value obtaining step
Upper switching value detected value, pjFor the pressure value in the detected pressure piping of jth detection step, k is pressure regulation, θ
For speed regulation, and meet k >=0,0 ＜ θ ＜ 1, i are cycle-index, and j is detection step number.As k=0, rate of pressure rise indicates
For Vi=θ v1(i-1)(referring to embodiment 1：Constant speed pressure control method).
In the function that pressure reduction medium-rate adjustment amount is pipeline inner pressure value, the function representation is Δ Vij=k (pj-
Fi-1), the rate of pressure reduction is expressed as Vij=θ v2(i-1)+ΔVij, wherein Δ VijFor the jth inspection in the i-th detected value obtaining step
Survey the speed adjust amount of step, VijFor the rate of pressure reduction in the i-th detected value obtaining step, v2(i-1)For the (i-1)-th detected value obtaining step
Rate of pressure reduction under middle acquisition when switching value detected value, Fi-1For the lower switching value detected in the (i-1)-th detected value obtaining step
Detected value, pjFor the pressure value in the detected pressure piping of jth detection step, k is pressure regulation, and θ is rate tune
Whole rate, and meet k >=0,0 ＜ θ ＜ 1, i are cycle-index, and j is detection step number.As k=0, rate of pressure reduction is expressed as Vi=θ
v2(i-1)(referring to embodiment 1：Constant speed pressure control method).
The detection method that embodiment 1 is provided can solve accuracy and repeat sex chromosome mosaicism.
Embodiment 1 is further solving pressure switch detecting system shown in Fig. 3 in slow boosting and decompression process
In more time-consuming problem, propose a kind of method for the detection pressure switch switching value that boosting and/or pressure reduction is rapidly completed.
Embodiment 2 and embodiment 1 institute are the difference is that the value of k is k ＞ 0 (referring to embodiment 2：Variable Rate
Pressure control method).The detection method that embodiment 2 is provided is on the basis of solving accuracy and repeating sex chromosome mosaicism, additionally it is possible to realize
Quickly detection.
In the method (including embodiment 1 and embodiment 2) of above-mentioned detection pressure switch switching value, the estimated value obtains
Step is taken, upper switching value detected value and rate of pressure rise or lower switching value are examined using the polynomial fitting method based on least square
The relationship of measured value and rate of pressure reduction is fitted estimation, and the corresponding switching value estimation of while being zero by rate of pressure rise or rate of pressure reduction
Value is used as upper switching value estimated value or lower switching value estimated value.
In the method (including embodiment 1 and embodiment 2) of above-mentioned detection pressure switch switching value, the judgment step
Middle specified amount δ is setting accuracy, and value is in the range of 0.2-0.5 times of the pressure switch precision.
In the method (including embodiment 1 and embodiment 2) of above-mentioned detection pressure switch switching value, in the initial value
In obtaining step, the pressure in the pressure piping is changed with faster rate of pressure rise or rate of pressure reduction, it is described until detecting
The on off operating mode of pressure switch switches, and pressure value when obtaining the pressure switch state switching is initial as upper switching value
Value R0Or lower switching value initial value F0, the rate of pressure rise or rate of pressure reduction when the pressure switch state is switched are as boosting speed
Rate initial value v10Or rate of pressure reduction initial value v20。
The present invention also provides a kind of device of detection pressure switch switching value, which opens for executing above-mentioned detection pressure
The method for closing switching value, can be rapidly completed the detection of the switching value of pressure switch, and accuracy is high, reproducible.
A kind of device of detection pressure switch switching value, including pressure generator, pressure sensor and pressure piping, pass through
Pressure generator, pressure sensor are connected to by pressure piping with the pressure switch, and the pressure is adjusted by pressure generator
Pressure size in solenoid road and so that the on off operating mode of the pressure switch is switched；Described device further includes that initial value obtains
Unit, detected value acquiring unit, estimated value acquiring unit and judging unit, wherein：
Initial value acquiring unit controls the pressure in the pressure generator change pressure piping, obtains the pressure and open
Pressure value when state switches in boost process is closed as upper switching value initial value R0And corresponding rate of pressure rise is as liter
Press rate initial value v10Or the pressure value in pressure reduction when pressure switch state switching is as lower switching value initial value F0And
Corresponding rate of pressure reduction is as rate of pressure reduction initial value v20；
Detected value acquiring unit controls the pressure in the pressure generator change pressure piping, obtains the pressure and open
Pressure value when state switches in boost process is closed as upper switching value detected value RiAnd corresponding rate of pressure rise v1i, or
Pressure value when state switches in pressure reduction is as lower switching value detected value FiAnd corresponding rate of pressure reduction v2i, wherein i=
1,2,3...；
Estimated value acquiring unit receives the data value that the detected value acquiring unit obtains, will obtain more than twice recently
To the upper switching value detected value including upper switching value initial value or the lower switching value including lower switching value initial value
Detected value is fitted estimation, obtains the upper switching value of the pressure switchEstimated value or lower switching value estimated valueWherein,
R=1,2,3...；
Judging unit receives the data value that the estimated value acquiring unit obtains, upper by what is got more than twice recently
The difference between maxima and minima in switching value estimated value or lower switching value estimated value is compared with specified amount δ, when
When the difference is greater than or equal to the specified amount δ, the detected value acquiring unit is made to carry out obtaining operation next time；When described
Difference be less than the specified amount δ when, using the last time obtain the upper switching value estimated value or lower switching value estimated value as
The upper switching value or lower switching value of the pressure switch.
Above-mentioned technical proposal is used, the solution have the advantages that：The method of the present invention uses multiple cycle detection mode
The switching value of pressure switch is detected, every time in detection, to meet the rate of pressure rise or drop when the switching of this pressure switch state
Rate of pressure rise v when rate being pressed to switch with last time pressure switch state1(i-1)Or rate of pressure reduction v2(i-1)Different modes obtains pressure
Upper switching value detected value when power switching or lower switching value detected value, and the switching value got more than twice recently is examined
Measured value is using fitting method of estimation acquisition switching value estimated value, in the switching value estimated value got more than twice up to date
When the difference of maxima and minima is less than specified amount δ, the switching value estimated value that the last time is obtained is as the pressure
The switching value of power switch；The device of the invention is easy to use, reliable operation；This method is using device provided by the invention come complete
At can improve the accuracy of testing result, ensure repeatability, reduce measurement error, save detection time.
Description of the drawings
Fig. 1 is a kind of structure diagram of the device for the detection pressure switch switching value for executing the method for the present invention；
Fig. 2 is a kind of flow chart of the method for detection pressure switch switching value provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of existing pressure switch detecting system；
Fig. 4 be the method for the present invention embodiment 1 in rate of pressure change and the pressure switching value of detection relational graph；
Fig. 5 be the method for the present invention embodiment 2 in rate of pressure change and the pressure switching value of detection relational graph；
Fig. 6 be the method for the present invention embodiment 3 in rate of pressure change and the pressure switching value of detection relational graph.
Reference numeral is expressed as in figure：
1：Pressure generator, 2：Pressure piping, 3：Pressure sensor, 4：Controller；5：Pressure switch；
41：Initial value acquiring unit；42：Detected value acquiring unit；43：Judging unit；44：Estimated value acquiring unit；
100：Pressure source, 101：Standard pressure gauge, 102：Isobaric pipeline, 103：Pressure switch, 104：On off state obtains
Unit.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments, the device and method of the detection pressure switch switching value of the present invention is carried out
It is described in detail.
The present invention is suitable for the detection of various pressure switches, and embodiment is carried out only for one of which electronic pressure switch
Illustrating, the embodiment of the present invention is not limited to these certain exemplary embodiments, and refer to be included in the scope of the present invention
All equivalents and alternative form, based on the embodiments of the present invention, those of ordinary skill in the art are not making wound
The every other embodiment that the property made is obtained under the premise of working, belongs to the disclosure of invention.
Fig. 1 is a kind of structure diagram of the device for the detection pressure switch switching value for executing the method for the present invention.Such as Fig. 1 institutes
Show, which includes pressure generator 1, pressure piping 2, pressure sensor 3 and controller 4, wherein pressure generator 1, pressure
Sensor 3 forms access (in Fig. 1 thick line indicate) physically by the connection of pressure piping 2, and with external 5 object of pressure switch
Reason connection；Controller 4 with 5 logical connection of pressure sensor 3 and external pressure switch, receives respectively and comes from 3 He of pressure sensor
The signal of pressure switch 5, and analyzing processing is carried out to the data of reception, and the control instruction of generation is sent to pressure
Device 1；The pipeline input interface end of pressure piping 2 and pressure switch 5 carries out physical connection, and pressure piping 2 is by 1 institute of pressure generator
The pressure of generation is transmitted in pressure switch 5, while the output switch parameter end logical connection of controller 4 and pressure switch 5, is used for
Receive the signal of 5 contact of pressure switch action.
Wherein, pressure generator 1 can be atmospheric pressure generator, can also be hydraulic pressure generator, using pressure
Pump driving；Pressure generator 1 receives the control instruction from controller 4, and control pressure pump is pressurized or depressurizes according to different rates,
The state of pressure generator 1 can also be transmitted to controller 4, and be transmitted to external equipment (such as liquid crystal display) and shown
Show.
Pressure sensor 3 is installed on pressure piping 2, is turned for detecting the pressure in pressure piping 2, and by pressure signal
It changes electric signal into and sends controller 4 to.
Controller 4 sends control instruction to pressure generator 1, and control pressure generator 1 changes the pressure in pressure piping 2
Power, and the pressure value of the acquisition of pressure sensor 3 and the status information of pressure switch 5 are received, to complete pressure switch switching
The detection of value, the device include initial value acquiring unit 41, detected value acquiring unit 42, estimated value acquiring unit 44 and judge single
Member 43, wherein：
Initial value acquiring unit 41 sends instructions to pressure generator 1, and control pressure generator 1 is with speed of boosting faster
The pressure that rate or rate of pressure reduction change in pressure piping 2 passes through until detecting that the on off operating mode of pressure switch 5 switches
Pressure sensor 3 obtains pressure value of the pressure switch 5 in boost process when generating state switching as upper switching value initial value
R0And corresponding rate of pressure rise initial value v10Or the pressure value in pressure reduction when state switching is as lower switching value initial value
F0And corresponding rate of pressure reduction initial value v20。
Detected value acquiring unit 42, sends instructions to pressure generator 1, and control pressure generator 1 changes in pressure piping 2
Pressure, obtain pressure switch 5 in boost process state switch when pressure value as upper switching value detected value RiAnd it is right
The rate of pressure rise v answered1i, or in pressure reduction state switch when pressure value be used as under switching value detected value FiAnd it is corresponding
Rate of pressure reduction v2i, wherein i=1,2,3...；
Estimated value acquiring unit 44 receives the data value that detected value acquiring unit 42 obtains, will obtain more than twice recently
To the upper switching value detected value including upper switching value initial value or the lower switching value including lower switching value initial value
Detected value is fitted estimation, obtains the upper switching value estimated value of pressure switch 5Or lower switching value estimated valueWherein, r=
1,2,3...；
Judging unit 43 receives the data value that estimated value acquiring unit 44 obtains, upper by what is got more than twice recently
The difference between maxima and minima in switching value estimated value or lower switching value estimated value is compared with specified amount δ, when
When the difference is greater than or equal to the specified amount δ, the detected value acquiring unit is made to carry out obtaining operation next time；When described
Difference be less than the specified amount δ when, using the last time obtain the upper switching value estimated value or lower switching value estimated value as
The upper switching value or lower switching value of the pressure switch 5.
Above-mentioned apparatus is a kind of way of realization of controller 4, and controller 4 can be there are many way of realization, for example, can be with
It is the cyclelog realized by software program, can also be combinational logic control device, or by manually realizing.
Electrical interface can be arranged in controller 4, and electrical interface can be the integrated component equipped with a variety of electric signal interfaces, can support
The access or output of different electrical signals, the electric signal interface include switch numbers amount interface, USB interface, serial ports, Ethernet interface
Deng can connect the output switch parameter end of pressure switch 5, receive the contact actuating signal of pressure switch 5, calculating can also be connected to
The external equipments such as machine, display or touch screen, for data acquisition, result is shown, program is downloaded, parameter setting, long-range tune
Examination and system update etc..Therefore the device can configure display screen by the electrical interface of controller 4, and handheld apparatus is made, convenient
Onsite application；Stationary installation is can also be used as, computer system is accessed, realizes long-range monitoring.
In existing pressure switch switching value detection device or method, realized mostly based on following mechanism：It is pressing
In power uphill process, the changed pressure value of trigger switch state is upper switching value R (actual value), drops process under stress
In, the pressure of trigger switch state change is lower switching value F (actual value), and R>F, then R-F be known as return difference.The presence of return difference increases
Big the neglecting application scenario of the strong stability of pressure switch work, usual return difference requires and different.During measurement, pressure
The pressure value that force snesor 3 measures is up or down switching value detected value, is denoted as RiOr Fi, then measurement error εiSwitch for ith
Value detected value subtracts obtained value, i.e. ε after actual value1i=Ri- R, ε2i=Fi- F, wherein i is to measure serial number, and R is upper switching
The actual value of value, RiFor the upper switching value that ith detects, ε1iFor the detection error of switching value in ith；F is lower switching value
Actual value, FiFor the lower switching value that ith detects, ε2iFor the detection error of switching value under ith.
When pressure in pressure piping 2 reaches switching point, need that by multiple links startup contact action letter could be obtained
Number, these links include pressure measurement, comparing element, the driving of switch, switch measurement and the sound for capturing switching of pressure switch
Between seasonable and the reading duration etc. of pressure sensor, these factors can cause the detected value of switching value to be more than or less than switching value
Actual value.
Therefore in measurement process, time delay mainly has two parts, first, reaching switching point to output contact from pressure value
The delay time when switching value of action is t1, second is that from when receiving delay of the switching value to the reading for receiving pressure sensor
Between be t2, then by the joint effect in terms of two above, then ε1i=ε11+ε12, ε2i=ε21+ε22, wherein ε1iFor the inspection of upper switching value
Survey error, ε11For delay time t1Caused error, ε12For delay time t2Caused error；ε2iIt is missed for the detection of lower switching value
Difference, ε21For delay time t1Caused error, ε22For delay time t2Caused error.Usual t1、t2It is smaller, therefore the time
Mean pressure variations rate in sectionDefinite value is can be used as, i.e.,
During repeated detection, the delay of pressure sensor, pressure switch is basically unchanged, therefore upper switching value or the detection of lower switching value miss
Poor ε1i、ε2iIt is substantially proportional to pressure change rate when triggering pressure switch action.
If pressure amplitude is Δ p, time of measuring t, constant pressure change rate is v, then sufficiently small in time of measuring t
In the case of, t=Δ p/v, i.e. time of measuring t and pressure change rate v are substantially inversely.
Based on this, in order to detect the switching value of accurate pressure switch, it is desirable to be cut in pressure switch on off operating mode
Pressure change rate v goes to zero when changing；On the other hand, in order to save time of measuring, it is desirable to be carried out using larger pressure change rate v
Pressure scanning.Pressure switch switching point testing result can be caused inaccurate because pressure change rate is excessive in practical operation；It is each
The rate of detection process is inconsistent cause it is less reproducible.
For this purpose, the present invention proposes the quick method for detecting pressure switch switching value that accuracy in detection is high, reproducible.
The present invention is by the way of cycle detection, the pass of detected value and rate of pressure change to the switching value of pressure switch
System has carried out fitting estimation, and while being zero using rate of pressure rise or rate of pressure reduction corresponding switching value estimated value is estimated as upper switching value
Evaluation or lower switching value estimated value, to eliminate as much as in pressure switch switching value detection process since pressure change rate is not
Error and uncertainty caused by zero.The specified amount δ for being employed as setting accuracy terminates the basis for estimation of cycle as detection.
The method for detecting pressure switch switching value：
Fig. 2 is a kind of flow chart of the method for detection pressure switch switching value provided in an embodiment of the present invention, and this method can
In device applied to detection pressure switch switching value shown in FIG. 1, below based on detection pressure switch switching value shown in FIG. 1
Device this method is described in detail.
As shown in Figure 1, the device is connected pressure generator 1, pressure sensor 3 and pressure switch 5 by pressure piping 2
It is logical, so that the on off operating mode of pressure switch 5 is switched by adjusting the pressure size in pressure piping 2, while using this hair
The method of the switching value of bright detection pressure switch detects the switching value of the pressure switch.As shown in Fig. 2, the detection pressure
The method of switching value includes the following steps：
S100 initial value obtaining steps：Pressure value of the pressure switch 5 in boost process when state switching is obtained to make
For upper switching value initial value R0And corresponding rate of pressure rise is as rate of pressure rise initial value v10Or pressure switch in pressure reduction
Pressure value when 5 states switch is as lower switching value initial value F0And corresponding rate of pressure reduction is as rate of pressure reduction initial value
v20。
In this step, the pressure in the pressure piping 2, Zhi Daojian are changed with faster rate of pressure rise or rate of pressure reduction
The on off operating mode for measuring the pressure switch 5 switches, and 5 state of the pressure switch is obtained by pressure sensor 3 and is cut
Pressure value when changing is as upper switching value initial value R0Or lower switching value initial value F0, when 5 state of the pressure switch is switched
Rate of pressure rise or rate of pressure reduction are as rate of pressure rise initial value v10Or rate of pressure reduction initial value v20。
Herein, in initial value acquisition process, the property of the rate of pressure rise or rate of pressure reduction of beginning generally according to pressure switch 5
It can be determined by empirical value, it is general to choose close to the upper limit of rate of pressure rise empirical value or rate of pressure reduction empirical value to approach pressure as early as possible
The switching value of power switch 5, to reduce detection time.
Rate of pressure rise or rate of pressure reduction when pressure switch switches can be calculated by program to be obtained, i.e., by pressure sensor 3
The process for reading pressure value to the pressure value read next time in pressure piping 2 in a pressure piping 2 is detected as one
Step, the then pressure value detected when pressure switch switches subtract the detected pressure value of a detection step, then divided by detection step
Rate of pressure rise v when time used, as pressure switch switch10Or rate of pressure reduction v20；It tests the speed if pressure sensor 3 has
Function can also record rate of pressure rise v when pressure switch switching by pressure sensor 310Or rate of pressure reduction v20；Pressure is opened
Rate of pressure rise or rate of pressure reduction when closing 5 switching can also be set based on experience value.
S200 detected value obtaining steps obtain pressure value of the pressure switch 5 in boost process when state switching as upper
Switching value detected value RiAnd corresponding rate of pressure rise v1i, or in pressure reduction state switch when pressure value be used as under switch
It is worth detected value FiAnd corresponding rate of pressure reduction v2i, wherein i=1,2,3....
In above-mentioned detected value obtaining step, during starting to detect the switching of 5 state of pressure switch, rate of pressure rise or
Rate of pressure reduction can be the rate of the arbitrary size in zone of reasonableness, it is preferred that with than faster rate of pressure rise or rate of pressure reduction
Change the pressure in pressure piping 2, which can be the rate of pressure rise or rate of pressure reduction of constant, can also be variation
Rate of pressure rise or rate of pressure reduction, for example, the rate of pressure rise or rate of pressure reduction in detected value obtaining step are the pressure pipe detected
The function of pressure value in road 2.
S300 estimated value obtaining steps, by get more than twice recently including the upper switching value initial value on cut
It changes value detected value or the lower switching value detected value including lower switching value initial value is fitted estimation, obtain the pressure and open
The upper switching value closedEstimated value or lower switching value estimated valueWherein, r=1,2,3....
The polynomial fitting method based on least square can be used and be fitted in above-mentioned estimated value obtaining step S300 and estimate
Meter, since for low order equation, least square method can be relatively uniform on a section using optimal square approach
Approximating function, and it is simple and practicable, effective big.
S400 judgment steps, will be in the upper switching value estimated value that got more than twice recently or lower switching value estimated value
Difference between maxima and minima is compared with specified amount δ, when the difference is greater than or equal to the specified amount δ,
Return to the detected value obtaining step S200；When the difference be less than the specified amount δ when, by the last time obtain it is described on
The upper switching value or lower switching value of switching value estimated value or lower switching value estimated value as the pressure switch.
In the judgment step S400 of the above method, can be used the difference of the switching value estimated value obtained twice recently with it is described
Specified amount δ compares, and carries out whether judgment method terminates, can also be using the above switching value obtained is estimated three times or three times recently
The maximum value of value and the difference of minimum value judge whether this method terminates compared with the specified amount δ, wherein the specified amount δ can
It is set according to the required precision of the precision of pressure switch 5 and application scenarios, it is specified that it can be fixed value to measure δ, it can not also
It is fixed value, for example, the value of specified amount δ used in the judgment step of detection process is different twice；It is obtained using later approach
The pressure switch switching value confidence level higher arrived, correspondingly, detection time may increase, and can be compromised according to testing requirements and be selected
It selects.
Optionally, this method can also include initialization step before S100 steps, each to what is arrived involved in this method
A parameter is configured, for example, specified amount δ setting, other parameters for being arranged of needs determine according to specific embodiment；
If parameters value is fixed as default value, the step can also be ignored.
Optionally, this method can also include output step after S400 judgment steps, i.e., in recycling last time
Obtained upper switching value estimated value and lower switching value estimated value is recorded in control as the upper switching value of pressure switch 5 and lower switching value
In device 4 processed, and send result to external equipment.
The realization process of above-mentioned steps can have different deformations according to different embodiments.
This method can be used for individually detecting the upper switching value of pressure switch or lower switching value, it can also be used to while detecting pressure
The upper switching value of switch 5 and lower switching value.
Below with detect simultaneously pressure switch upper switching value and lower switching value and in above-mentioned judgment step using nearest
In case of the difference of the switching value estimated value maximum value and minimum value that obtain twice is compared with the specified amount δ, it is discussed in detail
Several specific implementation steps of different embodiments.
Embodiment 1：Constant speed pressure control method
Specifically, this method is operated using the device of detection pressure switch switching value shown in FIG. 1, in detection process
In the pressure in pressure piping 2, including following steps changed with the rate of pressure rise and rate of pressure reduction of constant：
Initial value obtaining step：Changed in pressure piping 2 with faster rate of pressure rise or rate of pressure reduction by pressure generator 1
Pressure the pressure is obtained by pressure sensor 3 until detecting that the on off operating mode of the pressure switch 5 switches
Pressure value when 5 state of power switch switches in pressure piping 2 is as upper switching value initial value R0Or lower switching value initial value F0, with
And corresponding rate of pressure rise initial value v10Or rate of pressure reduction initial value v20, and the value of acquisition is stored in controller 4.
Detected value obtaining step：By pressure generator 1 from lower switching value F(i-1)Sentence Vi=θ V1(i-1)Rate of pressure rise liter
Pressure in high pressure pipeline 2, the upper switching value that pressure sensor 3 obtains when 5 generating state of pressure switch is switched is as upper
Switching value detected value Ri, and obtain the rate of pressure rise v when switching of 5 state of pressure switch1i；By pressure generator 1 from upper switching
Value RiSentence Vi=θ V2(i-1)Rate of pressure reduction reduce pressure piping 2 in pressure, pressed when 5 generating state of pressure switch is switched
The incision value that force snesor 3 obtains is as lower switching value detected value Fi, and obtain the boosting speed when switching of 5 state of pressure switch
Rate v2i, and the detected value obtained is stored in controller 4, wherein i is cycle-index, and θ is speed regulation, and meets i
=1,2,3..., 0 ＜ θ ＜ 1.
Estimated value obtaining step：Include upper switching value initial value R by what is got twice recently if i >=10Inside upper
Switching value detected value RiIt is fitted estimation, obtains the upper switching value estimated value of the pressure switchAnd it will obtain twice recently
That get includes lower switching value initial value F0Lower switching value detected value F insideiIt is fitted estimation, obtains the pressure switch
Lower switching value estimated valueOtherwise cycle-index i adds 1, and turns to detected value obtaining step, wherein r is estimation number, r=
1,2,3...。
Judgment step：If r >=2 and satisfaction：
WithCompletion is then detected, it will
During last time recycles obtained upper switching value estimated value and lower switching value estimated value as the upper switching value of pressure switch 5 under
Switching value, and be stored in controller 4, exit cycle；Otherwise cycle-index i adds 1, and estimated value number r adds 1, and turns to detection
It is worth obtaining step, wherein the value range of specified amount δ is 0.2-0.5 times of 5 precision of pressure switch.
In the above method, the value of the parameters such as specified amount δ and speed regulation θ is reset if necessary, then the embodiment party
Formula can also include initialization step；If the equipment connects external equipment, embodiment 1 may also include output step.
The cycle-index of the above method depends on set specified amount δ, speed regulation θ and initial boost rate v10
And/or initial decompression rate v20Deng, the detected value obtaining step medium-rate regulation θ of the above method is bigger, every time detection in rise
Rate or rate of pressure reduction is pressed to reduce slower, the time needed is shorter, but the detection number for reaching the required accuracy needs generally can
Increase, total detection time is longer accordingly；Opposite speed regulation θ is smaller, every time rate of pressure rise or rate of pressure reduction in detection
What is reduced is faster, and the corresponding number that detects can generally be reduced, but to execute the time longer for detection every time, needs to roll in actually detected
Middle consideration.The general required precisions with reference to the nominal value and application scenarios of pressure switch of specified amount δ are set, value range
Can be 0.2-0.5 times of 5 precision of pressure switch；The value range of so-called specified amount δ is the 0.2-0.5 of 5 precision of pressure switch
Times, the value for referring to specified amount δ can be some fixed value in the range of 0.2-0.5 times of 5 precision of pressure switch, can not also
It is fixed value, for example, the value of specified amount δ used in the judgment step of detection process is different twice.
Embodiment 2：Variable Rate pressure control method
In order to be further reduced detection time while meeting repeatability index δ, to the embodiment 1 of the above method into
Row improves, and uses the rate of pressure rise and rate of pressure reduction of real-time change in detection process each time, i.e., apart from pressure switch state
Switching point farther out when, pressure regulation is larger, conducive to the time is saved；When close to pressure switch state switching point, pressure change
Rate becomes smaller, and detection error reduces.In detection process, pressure sensor 3 is read into the pressure value in a pressure piping 2 and is arrived down
The primary process for reading the pressure value in pressure piping 2 is as a detection step；It will be cut in completion one-time detection pressure switch
The process for changing value and lower switching value is recycled as one.
Each step of each step and embodiment 1 included by the variable Rate pressure control method of embodiment 2 is essentially identical, difference
It is, pressure generator 1 changes the rule difference of the pressure in pressure piping 2 in detected value obtaining step, and embodiment 2 is adopted
Detected value obtaining step is as follows：
Detected value obtaining step：By pressure generator 1 from lower switching value Fi-1Sentence Vij=θ v1(i-1)+k(Ri-1-pj) liter
Rate is pressed to increase the pressure in pressure piping 2, the upper switching value that pressure sensor 3 obtains when 5 state of pressure switch is switched is made
For upper switching value detected value Ri, and obtain the rate of pressure rise v when switching of 5 state of pressure switch1i；Wherein, i is cycle-index, i
=1,2,3 ..., j is detection step number, and j=1,2,3 ..., k are pressure regulation, and θ is speed regulation, 0 ＜ k, 0 ＜ θ ＜
1；pjFor pressure value detected in 3 jth of pressure sensor unit detection step；v1(i-1)For (i-1) detected value obtaining step
Rate of pressure rise in middle acquisition when switching value detected value or rate of pressure rise initial value, Ri-1For in the (i-1)-th detected value obtaining step
The upper switching value detected value or upper switching value initial value detected；
By pressure generator 1 from upper switching value detected value RiSentence Vij=θ v2(i-1)+k(pj-Fi-1) rate of pressure reduction reduce
Pressure in pressure piping 2, the incision value that pressure sensor 3 obtains when 5 state of pressure switch is switched are examined as lower switching value
Measured value Fi, and obtain rate of pressure rise v when pressure switch state switching2i；And the value of above-mentioned acquisition is stored in controller 4；
Wherein, pjFor pressure value detected in 3 jth of pressure sensor unit detection step；v2(i-1)It is obtained for (i-1) detected value
Rate of pressure reduction when 5 state of pressure switch switches in step or rate of pressure reduction initial value, Fi-1It is walked to be obtained in the (i-1)-th detected value
The lower switching value detected value or lower switching value initial value detected in rapid.
Equally, which can also include initialization step and/or output step.
Pressure in pressure piping 2 is changed using the rate of pressure rise or rate of pressure reduction of real-time change, detects pressure switch
Up or down switching value detected value, pressure regulation k are numerically the fixed value more than zero.Equally, it is specified that amount δ is generally with reference to pressure
The required precision of the nominal value and application scenarios of switch is set, and value range can be the 0.2- of 5 precision of pressure switch
0.5 times；The value range of so-called specified amount δ is 0.2-0.5 times of 5 precision of pressure switch, and the value for referring to specified amount δ can be pressure
Some fixed value in the range of 0.2-0.5 times of 5 precision of power switch, may not be fixed value, for example, detection process twice
Judgment step used in specified amount δ value it is different.
This method can be further reduced detection time, and switching value detected value or lower switching value detected value is made to approach quickly
Actual value, and repeatability is preferably.
Embodiment 3：Fuzzy Control platen press
In the embodiment, the state of pressure value and pressure switch 5 that controller 4 is obtained according to pressure sensor 3 is believed
Breath provides indicative guiding rule to the pressure lifting of pressure piping；Operator can send out according to the instruction operating pressure of controller 4
Device 1 is given birth to realize boosting and pressure reduction.According to the boost or depressurization upper rate limit of pressure switch 5, upper rate limit is divided into
Different rates range, for example, guiding rule can be simple " slow boosting ", " middling speed boosting ", " fast boosting ", " being depressured slowly ",
The fuzzy guiding rules such as " middling speed decompression ", " fast decompression ".
Specifically, this method is operated using the device of detection pressure switch switching value shown in FIG. 1, in detection process
Middle operator changes the pressure in pressure piping 2 according to the instruction operating pressure generator 1 of controller 4, including following
Step：
Initial value obtaining step：Operating pressure generator 1 changes pressure piping 2 with faster rate of pressure rise or rate of pressure reduction
Interior pressure obtains the pressure by pressure sensor 3 until detecting that the state of the pressure switch 5 switches
Pressure value when 5 state of switch switches in pressure piping 2 is as upper switching value initial value R0Or lower switching value initial value F0, and
Corresponding rate of pressure rise initial value v10Or rate of pressure reduction initial value v20, and the value of acquisition is stored in controller 4.
Detected value obtaining step：Operating pressure generator 1 is from lower switching value F(i-1)It is advised according to the fuzzy guiding of controller 4 at place
The pressure in pressure piping 2 is then increased, the upper switching value that pressure sensor 3 obtains when 5 generating state of pressure switch is switched is made
For upper switching value detected value Ri, and obtain the rate of pressure rise v when switching of 5 state of pressure switch1i；By pressure generator 1 from upper
Switching value RiPlace reduces the pressure in pressure piping 2 according to the fuzzy guiding rule of controller 4, by 5 generating state of pressure switch
The incision value that pressure sensor 3 obtains when switching is as lower switching value detected value Fi, and when acquisition 5 state of pressure switch switching
Rate of pressure rise v2i, and the detected value obtained is stored in controller 4, wherein i is cycle-index, and θ is speed adjust
Rate, and meet i=1,2,3....
Estimated value obtaining step：Include upper switching value initial value R by what is got twice recently if i >=10Inside upper
Switching value detected value RiIt is fitted estimation, obtains the upper switching value of the pressure switchAnd it will recently get twice
Including lower switching value initial value F0Lower switching value detected value F insideiIt is fitted estimation, obtains the incision of the pressure switch
Change value estimated valueOtherwise cycle-index i adds 1, and turns to detected value obtaining step, wherein and r is to estimate number, r=1,2,
3...。
Judgment step：If r >=2 and satisfaction：
WithCompletion is then detected, it will
During last time recycles obtained upper switching value estimated value and lower switching value estimated value as the upper switching value of pressure switch 5 under
Switching value, and be stored in controller 4, exit cycle；Otherwise cycle-index i adds 1, and estimated value number r adds 1, and turns to detection
It is worth obtaining step, wherein the value range of specified amount δ is 0.2-0.5 times of 5 precision of pressure switch.
In the above method, the value of the parameters such as specified amount δ and speed regulation θ is reset if necessary, then the embodiment party
Formula can also include initialization step；If the equipment connects external equipment, which may also include output step.
Embodiment 1 and embodiment 2 are required to buck rate that pressure generator 1 is provided according to controller 4 to pressure
The pressure on solenoid road carries out real-time control, generally requires and is equipped with automatic measurement and control device to implement, has accurately, fast and easily
Advantage.Embodiment 3 is the simple realization of apparatus of the present invention, can equally realize the method for the present invention to pressure switch switching value into
Row accurately measures, and can use existing most of pressure-generating device, has the advantages that simple, practical, at low cost.
Embodiment 1：
Experimental verification is carried out below for 3 embodiments of the method for above-mentioned detection pressure switch switching value, wherein by
The pressure switch of survey is the CATO pressure switches of PN30-P060G14H3AQ, and specific parameter index is as shown in table 1.
Table 1 is tested the parameter list of pressure switch
| Measurand | CATO electron pressure switch |
| Model | PN30-P060G14H3AQ |
| Range (kPa) | 6000 |
| Precision | 0.5%f.s (0.5% range) |
In this experiment, it is that detection object is set as 6kPa (0.1% range), it is specified that measuring δ with above-mentioned CATO pressure switches.
In embodiment 1 and 2, initial rate takes 300kPa/s, and speed regulation θ's is taken as 0.5.In embodiment 2, pressure regulation
K is about 0.5.
The testing result of embodiment 1 is listed in table 2 and table 3, the pressure switching value of rate of pressure change and detection it
Between relationship be shown in FIG. 4；The testing result of embodiment 2 is listed in table 4 and table 5, rate of pressure change and detection
Relationship between pressure switching value is shown in FIG. 5；The testing result of embodiment 3 is listed in table 6 and table 7, pressure change
Relationship between speed and the pressure switching value of detection is shown in FIG. 6.
As shown in table 2 and table 3, embodiment 1 is raised and lowered in each cyclic process using constant speed pressure control method
Pressure in pressure piping 2, switching value 4049kPa can be detected by recycling 4 times, take 39.2 seconds, and recycling 5 times can detect down
Switching value 3863kPa takes 89.9 seconds；The pressure in pressure piping 2 is raised and lowered using variable Rate pressure control method in embodiment 2
Power needs cycle to obtain switching value 4051kPa 5 times, takes 33.7 seconds, recycles the lower switching value 3858kPa of 4 detections, takes
29.3 seconds；Percentage speed variation when 5 state of pressure switch switches when two kinds of embodiment detection loop terminations is reduced to smaller
Rate, the difference of the testing result of two kinds of embodiments is less than specified amount δ (i.e. 6kPa), and difference is small, ensure that testing result
Accuracy；The obvious starting stage using faster pressure change rate (300kPa/s) rapidly by pressure scanning range by 0~
6000kPa is contracted within about 3620~4300kPa, shortens the time of detection；Embodiment 2 is accelerated using variable Rate mode
Measurement process when far from switching value, is further greatly shortened required detection time.
The mode of the switching value of traditional manual detection pressure switch 5, pressure when not detected to pressure switch switching value
Power change rate makes specific requirement, by artificial experience it is difficult to ensure that the consistency of testing result and accuracy are (referring to embodiment 3
In switching value detected value).
The pressure in pressure piping 2 is raised and lowered using fuzzy pressure control method in embodiment 3, does not require to be gradually reduced
Rate of pressure rise or rate of pressure reduction, require operator low, realize simple.As shown in table 6 and table 7, only need to recycle 3 times can detect
Go out upper switching value 4050kPa, lower switching value 3859kPa, the result with embodiment 1 and embodiment 2 can be detected by recycling 4 times
Difference be less than specified amount δ, ensure that the accuracy of testing result.2 embodiment of table
The testing result of 1 upper switching value
The testing result of the lower switching value of 3 embodiment 1 of table
The testing result of the upper switching value of 4 embodiment 2 of table
The testing result of the lower switching value of 5 embodiment 2 of table
The testing result of the upper switching value of 6 embodiment 3 of table
The testing result of the lower switching value of 7 embodiment 3 of table
It will be appreciated by those skilled in the art that these embodiments or embodiment are merely to illustrate the present invention without limiting this
The range of invention, the various equivalent variations and modification made to the present invention belong to the disclosure of invention.
Claims (10)
1. a kind of method detecting pressure switch switching value with detection device,
Wherein, the detection device includes pressure generator, pressure sensor and pressure piping, is sent out pressure by pressure piping
Raw device, pressure sensor are connected to the pressure switch, and the pressure adjusted by pressure generator in the pressure piping is big
It is small, and the on off operating mode of the pressure switch is made to switch, the detection device uses the detection pressure switch switching value
Method detect the switching value of the pressure switch,
The method of the detection pressure switch switching value is characterised by comprising following steps：
Initial value obtaining step obtains pressure value of the pressure switch in boost process when state switching as upper switching value
Initial value R0And corresponding rate of pressure rise is as rate of pressure rise initial value v10Or in pressure reduction when pressure switch state switching
Pressure value as lower switching value initial value F0And corresponding rate of pressure reduction is as rate of pressure reduction initial value v20；
Detected value obtaining step obtains pressure value of the pressure switch in boost process when state switching as upper switching value
Detected value RiAnd corresponding rate of pressure rise v1i, or in pressure reduction state switch when pressure value be used as under switching value detect
Value FiAnd corresponding rate of pressure reduction v2i, wherein i is to measure serial number；
Estimated value obtaining step detects the upper switching value including upper switching value initial value got more than twice recently
Value or the lower switching value detected value including lower switching value initial value are fitted estimation, obtain the pressure switch on cut
Change value estimated valueOr lower switching value estimated valueWherein, r is estimation number；
Judgment step, by the upper switching value estimated value got more than twice recently or lower switching value estimated value maximum value with
Difference between minimum value is compared with specified amount δ, when the difference is greater than or equal to the specified amount δ, described in return
Detected value obtaining step；When the difference is less than the specified amount δ, by the upper switching value estimated value of the last time acquisition
Or upper switching value or lower switching value of the lower switching value estimated value as the pressure switch.
2. the method for detection pressure switch switching value according to claim 1, which is characterized in that in the judgment step,
The specified amount δ is setting accuracy, and value is in the range of 0.2-0.5 times of the pressure switch precision.
3. the method for detection pressure switch switching value according to claim 2, which is characterized in that the detected value obtains step
In rapid, to meet rate of pressure rise when the switching of this pressure switch state or when rate of pressure reduction switches with last time pressure switch state
Rate of pressure rise v1(i-1)Or rate of pressure reduction v2(i-1)Different modes obtains upper switching value detected value R when pressure switch switchingi
Or lower switching value detected value Fi。
4. the method for detection pressure switch switching value according to claim 3, which is characterized in that the detected value obtains step
In rapid, rate of pressure rise v when rate of pressure rise or rate of pressure reduction are switched compared with last time pressure switch state1(i-1)Or rate of pressure reduction
v2(i-1)Reduce, with after the reduction rate of pressure rise or rate of pressure reduction change the pressure in the pipeline plus a speed adjust amount
Power.
5. the method for detection pressure switch switching value according to claim 4, which is characterized in that the detected value obtains step
Speed adjust amount in rapid with the pressure value in pressure piping close to last time obtain including upper switching value initial value
Upper switching value detected value or lower switching value detected value including lower switching value initial value and become smaller.
6. the method for detection pressure switch switching value according to claim 5, which is characterized in that the speed adjust amount is
The function of pipeline inner pressure value, the function representation are Δ Vij=k (Ri-1-pj), the rate of pressure rise is expressed as Vij=θ v1(i-1)
+ΔVij, wherein Δ VijFor the speed adjust amount of the jth detection step in the i-th detected value obtaining step, VijIt is obtained for the i-th detected value
Take the rate of pressure rise in step, v1(i-1)To obtain boosting speed when upper switching value detected value in the (i-1)-th detected value obtaining step
Rate, Ri-1For the upper switching value detected value detected in the (i-1)-th detected value obtaining step, pjTo be examined in jth detection step
The pressure value in pressure piping is measured, k is pressure regulation, and θ is speed regulation, and meets k >=0, and 0 ＜ θ ＜ 1, i are cycle
Number, j are detection step number.
7. the method for detection pressure switch switching value according to claim 5, which is characterized in that the speed adjust amount is
The function of pipeline inner pressure value, the function representation are Δ Vij=k (pj-Fi-1), the rate of pressure reduction is expressed as Vij=θ v2(i-1)
+ΔVij, wherein Δ VijFor the speed adjust amount of the jth detection step in the i-th detected value obtaining step, VijIt is obtained for the i-th detected value
Take the rate of pressure reduction in step, v2(i-1)To obtain decompression speed when lower switching value detected value in the (i-1)-th detected value obtaining step
Rate, Fi-1For the lower switching value detected value detected in the (i-1)-th detected value obtaining step, pjTo be examined in jth detection step
The pressure value in pressure piping is measured, k is pressure regulation, and θ is speed regulation, and meets k >=0, and 0 ＜ θ ＜ 1, i are cycle
Number, j are detection step number.
8. the method for detection pressure switch switching value according to any one of claims 1 to 7, which is characterized in that described
In estimated value obtaining step, using the polynomial fitting method based on least square to upper switching value detected value and rate of pressure rise or
The relationship of lower switching value detected value and rate of pressure reduction is fitted estimation, and while being zero by rate of pressure rise or rate of pressure reduction is corresponding
Switching value estimated value is as upper switching value estimated value or lower switching value estimated value.
9. the method for detection pressure switch switching value according to any one of claims 1 to 7, which is characterized in that described
In initial value obtaining step, the pressure in the pressure piping is changed with faster rate of pressure rise or rate of pressure reduction, until detection
The on off operating mode for going out the pressure switch switches, and obtains the pressure value when pressure switch state switching as upper switching
It is worth initial value R0Or lower switching value initial value F0, rate of pressure rise or rate of pressure reduction when the pressure switch state is switched as
Rate of pressure rise initial value v10Or rate of pressure reduction initial value v20。
10. a kind of device of detection pressure switch switching value, including pressure generator, pressure sensor and pressure piping, pass through
Pressure generator, pressure sensor are connected to by pressure piping with the pressure switch, and the pressure is adjusted by pressure generator
Pressure size in solenoid road and so that the on off operating mode of the pressure switch is switched, which is characterized in that further include initial value
Acquiring unit, detected value acquiring unit, estimated value acquiring unit and judging unit, wherein：
Initial value acquiring unit controls the pressure in the pressure generator change pressure piping, obtains the pressure switch and exist
Pressure value when state switches in boost process is as upper switching value initial value R0And corresponding rate of pressure rise is as boosting speed
Rate initial value v10Or the pressure value in pressure reduction when pressure switch state switching is as lower switching value initial value F0And it is corresponding
Rate of pressure reduction as rate of pressure reduction initial value v20；
Detected value acquiring unit controls the pressure in the pressure generator change pressure piping, obtains the pressure switch and exist
Pressure value when state switches in boost process is as upper switching value detected value RiAnd corresponding rate of pressure rise v1i, or be depressured
Pressure value when state switches in the process is as lower switching value detected value FiAnd corresponding rate of pressure reduction v2i, wherein i is to measure
Serial number；
Estimated value acquiring unit receives the data value that the detected value acquiring unit obtains, by what is got more than twice recently
Upper switching value detected value including upper switching value initial value or the lower switching value detection including lower switching value initial value
Value is fitted estimation, obtains the upper switching value of the pressure switchEstimated value or lower switching value estimated valueWherein, r is
Estimate number；
Judging unit receives the data value that the estimated value acquiring unit obtains, the upper switching that will be got more than twice recently
The difference between maxima and minima in value estimated value or lower switching value estimated value is compared with specified amount δ, when described
When difference is greater than or equal to the specified amount δ, the detected value acquiring unit is made to carry out obtaining operation next time；When the difference
When less than the specified amount δ, the upper switching value estimated value or lower switching value estimated value that the last time is obtained are as described in
The upper switching value or lower switching value of pressure switch.
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| CN201610202573.1A CN105842616B (en) | 2016-03-31 | 2016-03-31 | A kind of variable Rate approaches the device and method of detection pressure switch switching value |
| EP16896127.4A EP3438680B1 (en) | 2016-03-31 | 2016-04-27 | Method and device for detecting switching value of pressure switch |
| US16/089,502 US11156517B2 (en) | 2016-03-31 | 2016-04-27 | Method and device for detecting switching value of pressure switch |
| PCT/CN2016/080363 WO2017166349A1 (en) | 2016-03-31 | 2016-04-27 | Method and device for detecting switching value of pressure switch |
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| CN201610202573.1A CN105842616B (en) | 2016-03-31 | 2016-03-31 | A kind of variable Rate approaches the device and method of detection pressure switch switching value |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202221468U (en) * | 2011-09-14 | 2012-05-16 | 郑州赛奥电子股份有限公司 | Gas density relay calibrator |
| CN102890238A (en) * | 2012-09-29 | 2013-01-23 | 上海市电力公司 | Detection method of mutation pressure relay |
| CN103900803A (en) * | 2012-12-26 | 2014-07-02 | 北京谊安医疗系统股份有限公司 | Machine-controlled safety valve detection method and device |
| CN204374380U (en) * | 2015-01-30 | 2015-06-03 | 台州市乐利电子科技有限公司 | For the control circuit of pressure switch detection device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100909443B1 (en) * | 2008-11-24 | 2009-07-30 | 한국수력원자력 주식회사 | Test apparatus and method for safety valve |
-
2016
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202221468U (en) * | 2011-09-14 | 2012-05-16 | 郑州赛奥电子股份有限公司 | Gas density relay calibrator |
| CN102890238A (en) * | 2012-09-29 | 2013-01-23 | 上海市电力公司 | Detection method of mutation pressure relay |
| CN103900803A (en) * | 2012-12-26 | 2014-07-02 | 北京谊安医疗系统股份有限公司 | Machine-controlled safety valve detection method and device |
| CN204374380U (en) * | 2015-01-30 | 2015-06-03 | 台州市乐利电子科技有限公司 | For the control circuit of pressure switch detection device |
Non-Patent Citations (1)
| Title |
|---|
| 压力开关智能化动态测试系统设计;张剑平;《传感器世界》;20041231;第35-37页 * |
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