CN105842616A - Device and method of detecting pressure switch switching values - Google Patents
Device and method of detecting pressure switch switching values Download PDFInfo
- Publication number
- CN105842616A CN105842616A CN201610202573.1A CN201610202573A CN105842616A CN 105842616 A CN105842616 A CN 105842616A CN 201610202573 A CN201610202573 A CN 201610202573A CN 105842616 A CN105842616 A CN 105842616A
- Authority
- CN
- China
- Prior art keywords
- value
- pressure
- rate
- switching
- switching value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a device and method of detecting pressure switch switching values. In each detection, the method obtains an upper switching value detection value or a lower switching value detection value and corresponding pressure change rates in pressure switch state switching in a mode in which the rate of pressure rise or the rate of pressure reduction in current pressure switch state switching is different from the rate of pressure rise or the rate of pressure reduction in last time of pressure switch state switching, performing fitting estimation on switching value detection values obtained in recent twice or more than twice switching to obtain switching value estimation values until the difference between a largest value and a smallest value in the switching value detection values obtained in recent twice or more than twice switching is less than an specified amount Delta, and employing the switching value estimation values obtained in the latest time of switching as a pressure switch switching value. The device is convenient to use, and reliable to work; the method is executed by the device, and can improve detection result accuracy, guarantee repetition, reduce measurement errors and save detection time.
Description
Technical field
The invention belongs to pressure sensing arts, be specifically related to a kind of device and method detecting pressure switch switching value.
Background technology
Pressure switch is a kind of conventional pressure control valve, when input pressure reaches (being raised or lowered to) predetermined value
Time, the state of switching on-off switches, to send alarm or control signal.Force value when pressure switch switches is referred to as
Pressure switch switching value, including upper switching value and lower switching value.With pressure switch control the start and stop of pressure-generating device or supercharging,
The opening and closing of air relief valve, can control the force value of pressure system within limits.Pressure control procedure at industrial circle
In, the accuracy of detection of pressure switch switching value directly affects pressure controling precision, needs the most before use to enter pressure switch
Row verification, detects pressure switch switching value.
Common pressure switch has mechanical type, the big class of electronic type two.Pressure is turned by the pressure element of electronic pressure switch
It is changed to the signal of telecommunication, after signal conditioning circuit, A/D conversion, becomes digital quantity, after treated device computing, obtain force value, with
Time processor force value is relatively come compared with user's setting value driving switch element (such as mechanical relay, electronic switching element
Deng) be switched on or switched off；Pressure is converted to deformation by the pressure element (diaphragm, corrugated tube, piston etc.) of mechanical pressure switch, warp
Mechanical mechanism promotes the on off operating mode of switch element more afterwards.Generally 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, forms path with ambient pressure pipeline,
The switching value of output switch parameter interface end output pressure switch contact action is (defeated containing break-make output type, level output type, amount of logic
Removing from mould etc.), the control unit in access industrial control system is used for Stress control.
Pressure source 100, standard pressure gauge 101 and pressure are opened by existing pressure switch detecting system (such as shown in Fig. 3)
Closing 103 and connect formation path by isobaric pipeline 102, on off state acquiring unit 104 is connected in pressure switch 103, measures
The break-make of pressure switch 103 contact.
Summary of the invention
In existing pressure switch detecting system shown in Fig. 3, pressure source 100 is slowly boosting to pressure switch 103 and is subtracting
Pressure, this process generally uses the method for artificial listening reading to measure, and the most useful circuit tester measurement switches on-off to be sentenced
Disconnect the change closed, while needing operator to judge switch change in operation, also accurately and in time to read number
According to, inevitably there is temporal delay during this, cause the numerical value of reading to there is bigger error with actual value, the most very
The phenomenon misread, judge by accident easily occurs；The speed boosted or reduce pressure during because of artificial reading, operation is inconsistent and causes detecting every time
Result is inconsistent, poor repeatability.
In the pressure switch switching value detection method that existing code is previously mentioned, pressure when not detecting switching value becomes
Rate makees quantitative requirement, only describes with " slowly ", it is difficult to ensure that the concordance of testing result and accuracy；And existing method
In, it is generally required to specify the general scope of switching value.
The invention aims to solve the problems referred to above, it is provided that the inspection that a kind of accuracy is high, reproducible, easy to use
The method of measuring pressure switch switching value.
The above-mentioned purpose of the present invention is realized by techniques below scheme:
A kind of method of detection device detection pressure switch switching value, wherein, described detection device includes that pressure occurs
Device, pressure transducer and pressure piping, by pressure piping by pressure generator, pressure transducer and described pressure switch even
Logical, adjusted the pressure size in described pressure piping by pressure generator, and make the on off operating mode of described pressure switch send out
Raw switching, described detection device uses the method for described detection pressure switch switching value to detect the switching of described pressure switch
Value, the method for described detection pressure switch switching value comprises the following steps:
Initial value obtaining step, obtain described pressure switch in boost process state switching time force value as on cut
Change value initial value R0And the rate of pressure rise of correspondence is as rate of pressure rise initial value v10, or in pressure reduction, pressure switch state is cut
Force value when changing is as lower switching value initial value F0And the rate of pressure reduction of correspondence is as rate of pressure reduction initial value v20；
Detected value obtaining step, obtain described pressure switch in boost process state switching time force value as on cut
Change value detected value RiAnd the rate of pressure rise v of correspondence1i, or force value when state switches in pressure reduction is as lower switching value
Detected value FiAnd the rate of pressure reduction v of correspondence2i, wherein, i=1,2,3...；
Estimated value obtaining step, upper including upper switching value initial value that nearest twice or more than twice is got
Switching value detected value or the lower switching value detected value including lower switching value initial value are fitted estimating, obtain described pressure
The upper switching value estimated value of switchOr lower switching value estimated valueWherein, r=1,2,3...；
Judge step, in the upper switching value estimated value got nearest twice or more than twice or lower switching value estimated value
Maxima and minima between difference compare with ormal weight δ, when described difference is more than or equal to described ormal weight δ
Time, return described detected value obtaining step；When described difference less than described ormal weight δ time, by the last time obtain described on
Switching value estimated value or lower switching value estimated value are as the upper switching value of described pressure switch or lower switching value.
In the method for above-mentioned detection pressure switch switching value, in described judgement step, described ormal weight δ is setting accuracy,
Its value is in the range of 0.2-0.5 times of described pressure switch precision.
In the method for above-mentioned detection pressure switch switching value, in described detected value obtaining step, open meeting this pressure
Off status switching time rate of pressure rise or rate of pressure reduction with last time pressure switch state switching time rate of pressure rise v1(i-1)Or blood pressure lowering
Speed v2(i-1)Different modes obtains upper switching value detected value R during 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 described detected value obtaining step is expressed as Vij
=θ v1(i-1), wherein, VijIt is the rate of pressure rise in the i-th detected value obtaining step, v1(i-1)It it is (i-1) detected value obtaining step
Rate of pressure rise during switching value detected value in middle acquisition, θ is speed regulation, and meets, 0 ＜ θ ＜ 1, i=1,2,3 ....
In the method for above-mentioned detection pressure switch switching value, the rate of pressure reduction in described detected value obtaining step is expressed as Vij
=θ v2(i-1), wherein, VijIt is the rate of pressure reduction in the i-th detected value obtaining step, v2(i-1)It it is (i-1) detected value obtaining step
Rate of pressure reduction during switching value detected value under middle acquisition, θ is speed regulation, and meets 0 ＜ θ ＜ 1, i=1,2,3 ....
In the method for above-mentioned detection pressure switch switching value, in described estimated value obtaining step, use based on a young waiter in a wineshop or an inn
The polynomial fitting method the taken advantage of relation to upper switching value detected value and rate of pressure rise or lower switching value detected value with rate of pressure reduction
It is fitted estimating, and using switching value estimated value corresponding when being zero to rate of pressure rise or rate of pressure reduction as upper switching value estimated value
Or lower switching value estimated value.
It addition, in the pressure switch detecting system that prior art is as shown in Figure 3, there is also pressure source 100 to pressure switch
The problem that 103 processes slowly boosted and reduce pressure are the most time-consuming.The present invention is to solve the process of detection pressure switch switching value
Relatively time-consuming technical problem, it is further provided a kind of accuracy is high, reproducible and can be rapidly completed boosting and/or fall
The method pressing through the detection pressure switch switching value of journey.
Adopt the following technical scheme that to achieve these goals
A kind of method of detection device detection pressure switch switching value, wherein, described detection device includes that pressure occurs
Device, pressure transducer and pressure piping, by pressure piping by pressure generator, pressure transducer and described pressure switch even
Logical, adjusted the pressure size in described pressure piping by pressure generator, and make the on off operating mode of described pressure switch send out
Raw switching, described detection device uses the method for described detection pressure switch switching value to detect the switching of described pressure switch
Value, the method for described detection pressure switch switching value comprises the following steps:
Initial value obtaining step, obtain described pressure switch in boost process state switching time force value as on cut
Change value initial value R0And the rate of pressure rise of correspondence is as rate of pressure rise initial value v10, or in pressure reduction, pressure switch state is cut
Force value when changing is as lower switching value initial value F0And the rate of pressure reduction of correspondence is as rate of pressure reduction initial value v20；
Detected value obtaining step, obtain described pressure switch in boost process state switching time force value as on cut
Change value detected value RiAnd the rate of pressure rise v of correspondence1i, or force value when state switches in pressure reduction is as lower switching value
Detected value FiAnd the rate of pressure reduction v of correspondence2i, wherein, i=1,2,3...；
Estimated value obtaining step, upper including upper switching value initial value that nearest twice or more than twice is got
Switching value detected value or the lower switching value detected value including lower switching value initial value are fitted estimating, obtain described pressure
The upper switching value estimated value of switchOr lower switching value estimated valueWherein, r=1,2,3...；
Judge step, in the upper switching value estimated value got nearest twice or more than twice or lower switching value estimated value
Maxima and minima between difference compare with ormal weight δ, when described difference is more than or equal to described ormal weight δ
Time, return described detected value obtaining step；When described difference less than described ormal weight δ time, by the last time obtain described on
Switching value estimated value or lower switching value estimated value are as the upper switching value of described pressure switch or lower switching value.
In the detected value obtaining step of above-mentioned detection method, by rate of pressure rise or rate of pressure reduction relatively pressure switch state last time
Rate of pressure rise v during switching1(i-1)Or rate of pressure reduction v2(i-1)Reduce, add one with the rate of pressure rise after this reduction or rate of pressure reduction
Speed adjustment amount changes the pressure in described pipeline.Speed adjustment amount obtained close to last time along with the force value in pressure piping
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 diminish.
Concrete, at the function that boost process medium-rate adjustment amount is pipeline inner pressure value, described function representation is Δ Vij
=k (Ri-1-pj), described rate of pressure rise is expressed as Vij=θ v1(i-1)+ΔVij, wherein, Δ VijIt is in the i-th detected value obtaining step
Jth detection step speed adjustment amount, VijIt is the rate of pressure rise in the i-th detected value obtaining step, v1(i-1)It it is (i-1) detection
Value obtaining step obtains rate of pressure rise during upper switching value detected value, Ri-1For detecting in (i-1) detected value obtaining step
To upper switching value detected value, pjFor the force value in the described jth detected pressure piping of detection step, k is that pressure adjusts
Rate, θ is speed regulation, and meets k >=0,0 ＜ θ ＜ 1, i=1,2,3 ..., j=1,2,3 ....As k=0, boosting speed
Rate is expressed as Vi=θ v1(i-1)(see embodiment 1: constant speed pressure control method).
At the function that pressure reduction medium-rate adjustment amount is pipeline inner pressure value, described function representation is Δ Vij=k (pj-
Fi-1), described rate of pressure reduction is expressed as Vij=θ v2(i-1)+ΔVij, wherein, Δ VijIt it is the jth inspection in the i-th detected value obtaining step
Survey the speed adjustment amount of step, VijIt is the rate of pressure reduction in the i-th detected value obtaining step, v2(i-1)It is that (i-1) detected value obtains step
Rate of pressure reduction during lower switching value detected value, F is obtained in rapidi-1For the incision detected in (i-1) detected value obtaining step
Change value detected value, pjFor the force value in the described jth detected pressure piping of detection step, k is pressure regulation, and θ is speed
Rate regulation, and meet k >=0,0 ＜ θ ＜ 1, i=1,2,3 ..., j=1,2,3 ....As k=0, rate of pressure reduction is expressed as
Vi=θ v2(i-1)(see embodiment 1: constant speed pressure control method).
The detection method that embodiment 1 is provided can solve accuracy and repeatability problem.
Embodiment 1 is in order to solve the pressure switch detecting system shown in Fig. 3 further at slowly boosting and decompression process
In the most time-consuming problem, a kind of method proposing detection pressure switch switching value being rapidly completed boosting and/or pressure reduction.
Embodiment 2 and 1 difference of embodiment are that the value of k is that k ＞ 0 (sees embodiment 2: variable Rate
Pressure control method).The detection method that embodiment 2 is provided is on the basis of solving accuracy and repeatability problem, 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, described estimated value obtains
Take step, use polynomial fitting method based on least square to upper switching value detected value and rate of pressure rise or the inspection of lower switching value
Measured value is fitted estimating with the relation of rate of pressure reduction, and switching value corresponding when being zero to rate of pressure rise or rate of pressure reduction is estimated
Value is 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, described judgement step
Middle ormal weight δ is setting accuracy, and its value is in the range of 0.2-0.5 times of described pressure switch precision.
In the method (including embodiment 1 and embodiment 2) of above-mentioned detection pressure switch switching value, at described initial value
In obtaining step, change the pressure in described pressure piping with rate of pressure rise faster or rate of pressure reduction, until detecting described
The on off operating mode of pressure switch switches, and force value when obtaining the switching of described pressure switch state is initial as upper switching value
Value RiOr lower switching value initial value Fi, rate of pressure rise or rate of pressure reduction when being switched by described pressure switch state are fast as boosting
Rate initial value v1iOr rate of pressure reduction initial value v2i。
The present invention also provides for a kind of device detecting pressure switch switching value, and this device is used for performing above-mentioned detection pressure and opens
The method closing switching value, it is possible to being rapidly completed the detection of the switching value of pressure switch, accuracy is high, reproducible.
A kind of device detecting pressure switch switching value, including pressure generator, pressure transducer and pressure piping, passes through
Pressure generator, pressure transducer are connected by pressure piping with described pressure switch, adjust described pressure by pressure generator
Pressure size in solenoid road and make the on off operating mode of described pressure switch switch；Described device also includes that initial value obtains
Unit, detected value acquiring unit, estimated value acquiring unit and judging unit, wherein:
Initial value acquiring unit, controls described pressure generator and changes the pressure in pressure piping, obtain described pressure and open
Close in boost process state switching time force value as on switching value initial value R0And the rate of pressure rise of correspondence is as liter
Pressure speed initial value v10, or force value when pressure switch state switches in pressure reduction 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 described pressure generator and changes the pressure in pressure piping, obtain described pressure and open
Close in boost process state switching time force value as on switching value detected value RiAnd the rate of pressure rise v of correspondence1i, or
In pressure reduction, force value during state switching is as lower switching value detected value FiAnd the rate of pressure reduction v of correspondence2i, wherein, i=
1,2,3...；
Estimated value acquiring unit, receive described detected value acquiring unit obtain data value, by nearest twice or twice with
On the upper switching value detected value including upper switching value initial value that gets or including lower switching value initial value under
Switching value detected value is fitted estimating, obtains the upper switching value of described pressure switchEstimated value or lower switching value estimated valueWherein, r=1,2,3...；
Judging unit, receives the data value that described estimated value acquiring unit obtains, and obtains nearest twice or more than twice
To upper switching value estimated value or lower switching value estimated value in maxima and minima between difference compare with ormal weight δ
Relatively, when described difference is more than or equal to described ormal weight δ, make described detected value acquiring unit obtain operation next time；
When described difference is less than described ormal weight δ, the described upper switching value estimated value obtained the last time or lower switching value are estimated
It is worth the upper switching value as described pressure switch or lower switching value.
Use technique scheme, the solution have the advantages that: the method for the present invention uses repeatedly cycle detection mode
Detect the switching value of pressure switch, every time in detection, to meet rate of pressure rise when this pressure switch state switches or fall
Rate of pressure rise v when pressure speed and pressure switch state switching last time1(i-1)Or rate of pressure reduction v2(i-1)Different modes obtains pressure
Upper switching value detected value during power switch switching or lower switching value detected value, and cutting that nearest twice or more than twice is got
Changing value detected value uses matching method of estimation to obtain switching value estimated value, the switching that twice or more than twice gets up to date
When the difference of the maxima and minima in value estimated value is less than ormal weight δ, the described switching value obtained the last time is estimated
It is worth the switching value as described pressure switch；Assembly of the invention is easy to use, reliable operation；The method uses the present invention to provide
Device complete, it is possible to increase the accuracy of testing result, it is ensured that repeatability, reduce measurement error, save the detection time.
Accompanying drawing explanation
Fig. 1 is carried out the structured flowchart of a kind of device detecting pressure switch switching value of the inventive method；
Fig. 2 is the flow chart of a kind of method detecting pressure switch switching value that the embodiment of the present invention provides；
Fig. 3 is the schematic diagram of existing pressure switch detecting system；
Fig. 4 be the inventive method embodiment 1 in the graph of a relation of pressure switching value of rate of pressure change and detection；
Fig. 5 be the inventive method embodiment 2 in the graph of a relation of pressure switching value of rate of pressure change and detection；
Fig. 6 be the inventive method embodiment 3 in the graph of a relation of pressure switching value of rate of pressure change and detection.
In figure, reference is expressed as:
1: pressure generator, 2: pressure piping, 3: pressure transducer, 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.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the device and method that the present invention detects pressure switch switching value is carried out
Describe in detail.
The present invention is applicable to the detection of various pressure switch, and embodiment is carried out only for one of which electronic pressure switch
Illustrating, embodiments of the invention are 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 embodiment in the present invention, those of ordinary skill in the art are not making wound
The every other embodiment obtained on the premise of the property made work, broadly falls into the disclosure of invention.
Fig. 1 is the structured flowchart of a kind of device detecting pressure switch switching value performing the inventive method.Such as Fig. 1 institute
Showing, this device includes pressure generator 1, pressure piping 2, pressure transducer 3 and controller 4, wherein, pressure generator 1, pressure
Sensor 3 is connected by pressure piping 2 and forms path (in Fig. 1, thick line represents) physically, and with outside pressure switch 5 thing
Reason connection；Controller 4 switchs 5 logics with pressure transducer 3 and external pressure respectively and is connected, and receives from pressure transducer 3 He
The signal of pressure switch 5, and be analyzed processing to the data received, and the control instruction of generation is sent to pressure generation
Device 1；Pressure piping 2 carries out physical connection with the pipeline input interface end of pressure switch 5, and pressure piping 2 is by pressure generator 1 institute
The pressure produced is sent in pressure switch 5, and controller 4 is connected with the output switch parameter end logic of pressure switch 5 simultaneously, is used for
Receive the signal of pressure switch 5 contact action.
Wherein, pressure generator 1 can be atmospheric pressure generator, it is also possible to be hydraulic pressure generator, uses pressure
Pump drives；Pressure generator 1 receives the control instruction from controller 4, controls compression pump according to different rates supercharging or decompression,
The state of pressure generator 1 can also be sent to controller 4, and be sent to external equipment (such as LCDs) and show
Show.
Pressure transducer 3 is installed on pressure piping 2, for detecting the pressure in pressure piping 2, and is turned by pressure signal
Change the signal of telecommunication into and send controller 4 to.
Controller 4 sends control instruction to pressure generator 1, controls pressure generator 1 and changes the pressure in pressure piping 2
Power, and receive force value and the status information of pressure switch 5 that pressure transducer 3 obtains, in order to complete pressure switch switching
The detection of value, this device includes initial value acquiring unit 41, detected value acquiring unit 42, estimated value acquiring unit 44 and judges single
Unit 43, wherein:
Initial value acquiring unit 41, sends instructions to pressure generator 1, controls pressure generator 1 with speed of boosting faster
Rate or rate of pressure reduction change the pressure in pressure piping 2, until detecting that the on off operating mode of pressure switch 5 switches, pass through
Pressure transducer 3 obtain force value when pressure switch 5 occurs state to switch in boost process as on switching value initial value
R0And the rate of pressure rise initial value v of correspondence10, or force value when state switches in pressure reduction is as lower switching value initial value
F0And the rate of pressure reduction initial value v of correspondence20。
Detected value acquiring unit 42, sends instructions to pressure generator 1, controls pressure generator 1 and changes in pressure piping 2
Pressure, obtain pressure switch 5 in boost process state switching time force value as on switching value detected value RiAnd it is right
The rate of pressure rise v answered1i, or force value when state switches in pressure reduction is as lower switching value detected value FiAnd correspondence
Rate of pressure reduction v2i, wherein, i=1,2,3...；
Estimated value acquiring unit 44, receive detected value acquiring unit 42 obtain data value, by nearest twice or twice with
On the upper switching value detected value including upper switching value initial value that gets or including lower switching value initial value under
Switching value detected value is fitted estimating, obtains the upper switching value estimated value of pressure switch 5Or lower switching value estimated valueIts
In, r=1,2,3...；
Judging unit 43, receives the data value that estimated value acquiring unit 44 obtains, and obtains nearest twice or more than twice
To upper switching value estimated value or lower switching value estimated value in maxima and minima between difference compare with ormal weight δ
Relatively, when described difference is more than or equal to described ormal weight δ, make described detected value acquiring unit obtain operation next time；
When described difference is less than described ormal weight δ, the described upper switching value estimated value obtained the last time or lower switching value are estimated
It is worth the upper switching value as described pressure switch 5 or lower switching value.
Said apparatus is a kind of way of realization of controller 4, and controller 4 can have multiple way of realization, for example, it is possible to
It is the cyclelog realized by software program, it is also possible to be Combinational Logic Control device, or by manually realizing.
Controller 4 can arrange electrical interface, and electrical interface can be the integrated component being provided with multiple electric signal interface, it would be preferable to support
The access of different electrical signals or output, described electric signal interface includes switch numbers amount interface, USB interface, serial ports, Ethernet interface
Deng, the output switch parameter end of pressure switch 5 can be connect, receive the contact actuating signal of pressure switch 5, it is also possible to be connected to calculate
The external equipments such as machine, display or touch screen, for data acquisition, result shows, download program, parameter set, remotely adjust
Examination and system update etc..Therefore this device can be configured display screen by the electrical interface of controller 4, makes handheld apparatus, convenient
Onsite application；Computer system can also be accessed, it is achieved remotely monitor as stationary installation.
In existing pressure switch switching value detection device or method, mostly realize based on following mechanism: in pressure
In power uphill process, the force value that triggering on off state changes is upper switching value R (actual value), drops process under stress
In, the pressure triggering on off state change is lower switching value F (actual value), and R > F, then R-F is referred to as return difference.The existence of return difference increases
The strong stability of pressure switch work, generally returns extent and regards application scenario and require and different.During measuring, pressure
The pressure value that force transducer 3 records is up or down switching value detected value, is designated as RiOr Fi, then measurement error εiSwitch for i & lt
The value that value detected value is obtained after deducting actual value, i.e. ε1i=Ri-R, ε2i=Fi-F, wherein, i is for measuring sequence number, and R is upper switching
The actual value of value, RiThe upper switching value detected for i & lt, ε1iFor the detection error of switching value in i & lt；F is lower switching value
Actual value, FiThe lower switching value detected for i & lt, ε2iFor the detection error of switching value under i & lt.
When pressure in pressure piping 2 reaches switching point, need to obtain startup contact action letter through multiple links
Number, these links include that the pressure measxurement of pressure switch, comparing element, the driving of switch, switch are measured and capture the sound of switching
Between Ying Shi and the reading duration etc. of pressure transducer, these factors can cause the detected value of switching value more than or less than switching value
Actual value.
Therefore, during measuring, time delay mainly has two parts, and one is to arrive switching point to output contact from force value
The time delay during switching value of action is t1, two is in time receiving switching value to the delay of the reading receiving pressure transducer
Between be t2, then by the joint effect in terms of two above, then ε1i=ε11+ε12, ε2i=ε21+ε22, wherein, ε1iInspection for upper switching value
Survey error, ε11For t time delay1The error caused, ε12For t time delay2The error caused；ε2iDetection for lower switching value misses
Difference, ε21For t time delay1The error caused, ε22For t time delay2The error caused.Generally t1、t2Smaller, therefore this time
Mean pressure variations rate in DuanCan be used as definite value, i.e.
During repeated detection, pressure transducer, the delay of pressure switch are basically unchanged, and therefore go up switching value or the detection of lower switching value misses
Difference ε1i、ε2iIt is substantially proportional to pressure change rate when triggering pressure switch action.
If pressure amplitude is Δ p, the measurement time is t, and pressure change rate is constant for v, then to measure time t sufficiently small
In the case of, t=Δ p/v, i.e. measures time t and pressure change rate v the most inversely.
Based on this, in order to the switching value of accurate pressure switch be detected, it is desirable to cut at pressure switch on off operating mode
When changing, pressure change rate v goes to zero；On the other hand, in order to save the measurement time, it is desirable to use bigger pressure change rate v to carry out
Pressure scanning.Practical operation can cause pressure switch switching point testing result inaccurate because pressure change rate is excessive；Each
The speed of detection process is inconsistent causes repeatability poor.
To this end, the present invention proposes the method quickly detecting pressure switch switching value that accuracy in detection is high, reproducible.
The present invention uses the mode of cycle detection, the pass to the detected value of the switching value of pressure switch with rate of pressure change
System has carried out matching estimation, and switching value estimated value corresponding when being zero to rate of pressure rise or rate of pressure reduction is estimated as upper switching value
Evaluation or lower switching value estimated value, thus during eliminating as much as the detection of pressure switch switching value due to pressure change rate be not
Zero error brought and uncertainty.The ormal weight δ as setting accuracy is used to terminate the basis for estimation of circulation as detection.
The method of detection pressure switch switching value:
The flow chart of a kind of method detecting pressure switch switching value that Fig. 2 provides for the embodiment of the present invention, the method can
It is applied in the device of the detection pressure switch switching value shown in Fig. 1, below based on the detection pressure switch switching value shown in Fig. 1
Device the method is described in detail.
As it is shown in figure 1, this device is by pressure piping 2 by pressure generator 1, pressure transducer 3 and pressure switch 5 even
Logical, make the on off operating mode of pressure switch 5 switch by the pressure size in adjustment pressure piping 2, use this simultaneously
The method of the switching value of bright detection pressure switch detects the switching value of described pressure switch.As in figure 2 it is shown, this detection pressure
The method of switch switching value comprises the following steps:
S100 initial value obtaining step: obtain the described pressure switch 5 force value in boost process during state switching and make
For upper switching value initial value R0And the rate of pressure rise of correspondence is as rate of pressure rise initial value v10, or pressure switch in pressure reduction
Force value during 5 state switching is as lower switching value initial value F0And the rate of pressure reduction of correspondence is as rate of pressure reduction initial value
v20。
In this step, change the pressure in described pressure piping 2 with rate of pressure rise faster or rate of pressure reduction, until inspection
The on off operating mode measuring described pressure switch 5 switches, and obtains described pressure switch 5 state by pressure transducer 3 and cuts
Force value when changing is as upper switching value initial value R0Or lower switching value initial value F0, when described pressure switch 5 state 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 rate of pressure rise of beginning or rate of pressure reduction are generally according to the property of pressure switch 5
Can be determined by empirical value, typically choose the upper limit of close 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, thus reduce the detection time.
Rate of pressure rise or rate of pressure reduction during pressure switch switching can be calculated by program and obtain, will pressure transducer 3
Read force value in a pressure piping 2 process to the force value read in pressure piping 2 next time as a detection
Step, then the force value detected during pressure switch switching deducts the force value detected by a detection step, then divided by detection step
Time used, it is rate of pressure rise v during pressure switch switching10Or rate of pressure reduction v20；If pressure transducer 3 has test the speed
Function, it is also possible to record rate of pressure rise v during pressure switch switching by pressure transducer 310Or rate of pressure reduction v20；Pressure is opened
Rate of pressure rise or rate of pressure reduction when closing 5 switching can also set based on experience value.
S200 detected value obtaining step, obtain pressure switch 5 in boost process state switching time force value as on
Switching value detected value RiAnd the rate of pressure rise v of correspondence1i, or force value when state switches in pressure reduction is as lower switching
Value detected value FiAnd the rate of pressure reduction v of correspondence2i, wherein, i=1,2,3....
In above-mentioned detected value obtaining step, during starting to detect the switching of pressure switch 5 state, rate of pressure rise or
Rate of pressure reduction can be the speed of the arbitrary size in zone of reasonableness, it is preferred that with than rate of pressure rise faster or rate of pressure reduction
Changing the pressure in pressure piping 2, this speed can be rate of pressure rise or the rate of pressure reduction of constant, it is also possible to is change
Rate of pressure rise or rate of pressure reduction, such as, rate of pressure rise or rate of pressure reduction in detected value obtaining step are the manometer tube detected
The function of force value in road 2.
S300 estimated value obtaining step, nearest twice or more than twice is got including upper switching value initial value
Upper switching value detected value or lower switching value detected value including lower switching value initial value be fitted estimating, obtain described
The upper switching value of pressure switchEstimated value or lower switching value estimated valueWherein, r=1,2,3....
Above-mentioned estimated value obtaining step S300 can use polynomial fitting method based on least square to be fitted estimating
Meter, due to for low order equation, method of least square utilize optimal square approach can on an interval ratio more uniform
Approximating function, and simple, effective greatly.
S400 judges step, and the upper switching value estimated value got nearest twice or more than twice or lower switching value are estimated
The difference between maxima and minima in value compares with ormal weight δ, when described difference is more than or equal to described regulation
During amount δ, return described detected value obtaining step S200；When described difference is less than described ormal weight δ, the last time is obtained
Described upper switching value estimated value or lower switching value estimated value are as the upper switching value of described pressure switch or lower switching value.
In judgement step S400 of said method, the difference of switching value estimated value of nearest twice acquisition can be used with described
Ormal weight δ compares, and carries out whether determination methods terminates, it would however also be possible to employ the switching value that nearest three times or more than three times obtain is estimated
The maximum of value and the difference of minima compare with described ormal weight δ, it is judged that whether the method terminates, and wherein, described ormal weight δ can
Precision and the required precision of application scenarios according to pressure switch 5 set, it is stipulated that amount δ can be fixed value, it is also possible to no
Being fixed value, such as, the value of ormal weight δ used in the judgement step of twice detection process is different；Employing later approach obtains
The pressure switch switching value credibility arrived is higher, and correspondingly, the detection time may increase, can be according to testing requirement compromise choosing
Select.
Alternatively, the method can also include initialization step before S100 step, each to relate in the method
Individual parameter is configured, such as the setting of ormal weight δ, and other need the parameter arranged to determine according to specific embodiment；
If parameters value is fixed as default value, it is also possible to ignore this step.
Alternatively, the method can also include exporting step, in will circulating for the last time after S400 judges step
The upper switching value estimated value that obtains and lower switching value estimated value as the upper switching value of pressure switch 5 and lower switching value record in control
In device 4 processed, and send result to external equipment.
The process that realizes of above-mentioned steps can have different deformation according to different embodiments.
The method can be used for individually detecting the upper switching value of pressure switch or lower switching value it can also be used to detect pressure simultaneously
The upper switching value of switch 5 and lower switching value.
Below to detect the upper switching value of pressure switch and lower switching value and to use recently in above-mentioned judgement step simultaneously
In case of the switching value estimated value maximum of twice acquisition and the difference of minima compare with described ormal weight δ, it is discussed in detail
The enforcement step that several different embodiments are concrete.
Embodiment 1: constant speed pressure control method
Specifically, the device of the detection pressure switch switching value shown in the method application drawing 1 operates, in detection process
In change the pressure in pressure piping 2, including following step with rate of pressure rise and the rate of pressure reduction of constant:
Initial value obtaining step: changed in pressure piping 2 with rate of pressure rise faster or rate of pressure reduction by pressure generator 1
Pressure, until detect that the on off operating mode of described pressure switch 5 switches, obtain described pressure by pressure transducer 3
When power switchs 5 state switching, the force value 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 when occurring state to switch pressure switch 5, pressure transducer 3 obtains is as upper
Switching value detected value Ri, and obtain rate of pressure rise v when pressure switch 5 state switches1i；By pressure generator 1 from upper switching
Value RiSentence Vi=θ V2(i-1)Rate of pressure reduction reduce the pressure in pressure piping 2, pressure when occurring state switch pressure switch 5
The incision value that force transducer 3 obtains is as lower switching value detected value Fi, and obtain boosting speed when pressure switch 5 state switches
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: if i >=1, get nearest twice includes upper switching value initial value R0Interior upper
Switching value detected value RiIt is fitted estimating, obtains the upper switching value estimated value of described pressure switchAnd nearest twice is obtained
Switching value initial value F under the including got0At interior lower switching value detected value FiIt is fitted estimating, obtains described pressure switch
Lower switching value estimated valueOtherwise cycle-index i adds 1, and turns to detected value obtaining step, and wherein, r is for estimating number of times, r=
1,2,3...。
Judge step: if r >=2 and meeting:
WithThen detect, will
The upper switching value estimated value that obtains in last circulation and lower switching value estimated value as pressure switch 5 upper switching value and under
Switching value, and be stored in controller 4, exit circulation；Otherwise cycle-index i adds 1, and estimated value number r adds 1, and turns to detection
Value obtaining step, wherein, it is stipulated that 0.2-0.5 times that span is pressure switch 5 precision of amount δ.
In said method, if needing to reset ormal weight δ and the isoparametric value of speed regulation θ, then this embodiment party
Formula can also include initialization step；If described equipment connects external equipment, then embodiment 1 may also include output step.
The cycle-index of said method depends on set ormal weight δ, speed regulation θ and initial boost speed v10
And/or initial decompression speed v20Deng, detected value obtaining step medium-rate regulation θ of said method is the biggest, rises in detection every time
It is the slowest that pressure speed or rate of pressure reduction reduce, and the time of needs is the shortest, but the detection number of times reaching required precision needs typically can
Increasing, total detection time is the longest；Contrary speed regulation θ is the least, every time rate of pressure rise or rate of pressure reduction in detection
Reduce is the fastest, and corresponding detection number of times typically can reduce, but to detect the execution time the longest every time, needs folding in actually detected
Middle consideration.Ormal weight δ is typically set with reference to the nominal value of pressure switch and the required precision of application scenarios, its span
It can be 0.2-0.5 times of pressure switch 5 precision；The 0.2-0.5 that span is pressure switch 5 precision of so-called ormal weight δ
Times, refer to that the value of ormal weight δ can be certain fixed value in the range of 0.2-0.5 times of pressure switch 5 precision, it is also possible to no
Being fixed value, such as, the value of ormal weight δ used in the judgement step of twice detection process is different.
Embodiment 2: variable Rate pressure control method
In order to reduce the detection time further while meeting repeatability index δ, the embodiment 1 of said method is entered
Row improves, and uses rate of pressure rise and the rate of pressure reduction of real-time change each time, i.e. at distance pressure switch state during detection
Switching point farther out time, pressure regulation is relatively big, the most time-consuming；When close to pressure switch state switching point, pressure changes
Rate diminishes, and detection error reduces.During detection, the force value that pressure transducer 3 reads in a pressure piping 2 is arrived down
The process once reading the force value in pressure piping 2 walks as a detection；By complete one-time detection pressure switch on cut
The process of value and lower switching value of changing is as a circulation.
Each step included by variable Rate pressure control method of embodiment 2 is essentially identical with each step of embodiment 1, difference
Being, the rule of the pressure in pressure generator 1 changes pressure piping 2 in detected value obtaining step is different, and embodiment 2 is adopted
Detected value obtaining step 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
Pressure speed raises the pressure in pressure piping 2, and the upper switching value that when pressure switch 5 state being switched, pressure transducer 3 obtains is made
For upper switching value detected value Ri, and obtain rate of pressure rise v when pressure switch 5 state switches1i；Wherein, i is cycle-index, i
=1,2,3 ..., j is detection step number, j=1,2,3 ..., k is pressure regulation, and θ is speed regulation, 0 ＜ k, 0 ＜ θ ＜
1；pjFor force value detected in pressure sensor unit 3 jth detection step；v1(i-1)It it is (i-1) detected value obtaining step
Rate of pressure rise during switching value detected value or rate of pressure rise initial value, R in middle acquisitioni-1For in the i-th-1 detected value obtaining step
The upper switching value detected value detected or upper switching value initial value；
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 when pressure switch 5 state being switched, pressure transducer 3 obtains is examined as lower switching value
Measured value Fi, and obtain rate of pressure rise v when pressure switch state switches2i；And the value of above-mentioned acquisition is stored in controller 4；
Wherein, pjFor force value detected in pressure sensor unit 3 jth detection step；v2(i-1)It is that (i-1) detected value obtains
The rate of pressure reduction during switching of pressure switch 5 state or rate of pressure reduction initial value, F in stepi-1For obtaining step at the i-th-1 detected value
The lower switching value detected value detected in Zhou or lower switching value initial value.
Equally, this embodiment can also include initialization step and/or output step.
The rate of pressure rise or the rate of pressure reduction that use real-time change change the pressure in pressure piping 2, detection pressure switch
Up or down switching value detected value, pressure regulation k is numerically the fixed value more than zero.Equally, it is stipulated that amount δ is general with reference to pressure
The nominal value of switch and the required precision of application scenarios are set, and its span can be the 0.2-of pressure switch 5 precision
0.5 times；0.2-0.5 times that span is pressure switch 5 precision of so-called ormal weight δ, refers to that the value of ormal weight δ can be pressure
Power switchs certain fixed value in the range of 0.2-0.5 times of 5 precision, it is also possible to be not fixed value, such as, and twice detection process
Judgement step in the value of used ormal weight δ different.
The method can reduce the detection time further, makes switching value detected value or lower switching value detected value quickly approach
Actual value, and repeatability is preferably.
Embodiment 3: Fuzzy Control platen press
In this embodiment, force value and the state of pressure switch 5 that controller 4 obtains according to pressure transducer 3 are believed
Breath, provides indicative guiding rule to the pressure lifting of pressure piping；Operator can operate pressure according to the instruction of controller 4 and send out
Raw device 1 realizes boosting and pressure reduction.Boosting according to pressure switch 5 or blood pressure lowering upper rate limit, be divided into upper rate limit
Different rates scope, such as, guide rule can be simple " boosting slowly ", " middling speed boosting ", " boosting soon ", " slow blood pressure lowering ",
" middling speed blood pressure lowering ", " fast blood pressure lowering " etc. are fuzzy guides rule.
Specifically, the device of the detection pressure switch switching value shown in the method application drawing 1 operates, in detection process
Middle operator changes the pressure in pressure piping 2, including following according to the instruction operation pressure generator 1 of controller 4
Step:
Initial value obtaining step: operation pressure generator 1 changes pressure piping 2 with rate of pressure rise faster or rate of pressure reduction
Interior pressure, until detecting that the state of described pressure switch 5 switches, obtains described pressure by pressure transducer 3
When switching 5 state switching, the force value 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: operation pressure generator 1 is from lower switching value F(i-1)Place is according to the fuzzy guiding rule of controller 4
Then raising the pressure in pressure piping 2, the upper switching value that when occurring state to switch pressure switch 5, pressure transducer 3 obtains is made
For upper switching value detected value Ri, and obtain rate of pressure rise v when pressure switch 5 state switches1i；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, and pressure switch 5 is occurred state
The incision value that during switching, pressure transducer 3 obtains is as lower switching value detected value Fi, and when obtaining the switching of pressure switch 5 state
Rate of pressure rise v2i, and the detected value obtained is stored in controller 4, wherein, i is cycle-index, and θ is that speed adjusts
Rate, and meet i=1,2,3....
Estimated value obtaining step: if i >=1, get nearest twice includes upper switching value initial value R0Interior upper
Switching value detected value RiIt is fitted estimating, obtains the upper switching value of described pressure switchAnd nearest twice is got
Including lower switching value initial value F0At interior lower switching value detected value FiIt is fitted estimating, obtains the incision of described pressure switch
Change value estimated valueOtherwise cycle-index i adds 1, and turns to detected value obtaining step, and wherein, r is estimation number of times, r=1, and 2,
3...。
Judge step: if r >=2 and meeting:
WithThen detect, will
The upper switching value estimated value that obtains in last circulation and lower switching value estimated value as pressure switch 5 upper switching value and under
Switching value, and be stored in controller 4, exit circulation；Otherwise cycle-index i adds 1, and estimated value number r adds 1, and turns to detection
Value obtaining step, wherein, it is stipulated that 0.2-0.5 times that span is pressure switch 5 precision of amount δ.
In said method, if needing to reset ormal weight δ and the isoparametric value of speed regulation θ, then this embodiment party
Formula can also include initialization step；If described equipment connects external equipment, then this embodiment may also include output step.
Embodiment 1 and embodiment 2 are required to buck speed that pressure generator 1 provides according to controller 4 to pressure
The pressure on solenoid road controls in real time, implements it is generally required to be equipped with automatic measurement and control device, has accurately, fast and easily
Advantage.Embodiment 3 is the simple realization of apparatus of the present invention, is capable of the inventive method equally and enters pressure switch switching value
Row is measured accurately, and can use existing major part pressure-generating device, has simple, practical, the advantage of low cost.
Embodiment 1:
Carry out experimental verification below for 3 embodiments of the method for above-mentioned detection pressure switch switching value, wherein by
The CATO pressure switch that pressure switch is PN30-P060G14H3AQ surveyed, concrete parameter index is as shown in table 1.
The parameter list of the tested pressure switch of table 1
| Measurand | CATO electron pressure switch |
| Model | PN30-P060G14H3AQ |
| Range (kPa) | 6000 |
| Precision | 0.5%f.s (0.5% range) |
In this experiment, with above-mentioned CATO pressure switch for detection object, it is stipulated that amount δ is set to 6kPa (0.1% range).
In embodiment 1 and 2, initial rate takes 300kPa/s, and speed regulation θ 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 its rate of pressure change and detection it
Between relation figure 4 illustrates；The testing result of embodiment 2 is listed in table 4 and table 5, its rate of pressure change and detection
Relation between pressure switching value figure 5 illustrates；The testing result of embodiment 3 is listed in table 6 and table 7, and its pressure changes
Relation between the pressure switching value of speed and detection figure 6 illustrates.
As shown in table 2 and table 3, embodiment 1 uses constant speed pressure control method to be raised and lowered in each cyclic process
Pressure in pressure piping 2, circulates and can detect switching value 4049kPa for 4 times, time-consuming 39.2 seconds, circulates and can detect down for 5 times
Switching value 3863kPa, time-consuming 89.9 seconds；Embodiment 2 uses variable Rate pressure control method so that pressure pressure piping 2 in is raised and lowered
Power, needs to circulate 5 times and obtains upper switching value 4051kPa, time-consuming 33.7 seconds, circulates lower switching values 3858kPa of 4 detections, time-consumingly
29.3 seconds；During two kinds of embodiment detection loop terminations, the percentage speed variation during switching of pressure switch 5 state is all reduced to less
Speed, the difference of the testing result of two kinds of embodiments be less than ormal weight δ (i.e. 6kPa), difference is little, it is ensured that testing result
Accuracy；Obviously the starting stage use faster pressure change rate (300kPa/s) rapidly by pressure scanning scope by 0～
Within 6000kPa is contracted to about 3620～4300kPa, shorten the time of detection；Embodiment 2 uses variable Rate mode to accelerate
Away from measurement process during switching value, required detection time is greatly shortened further.
The mode of the switching value of traditional manually detection pressure switch 5, pressure when pressure switch switching value not being detected
Power rate of change makes specific requirement, by artificial experience it is difficult to ensure that the concordance of testing result and accuracy (see embodiment 3
In switching value detected value).
Embodiment 3 uses fuzzy pressure control method that pressure pressure piping 2 in is raised and lowered, it is not required that be gradually reduced
Rate of pressure rise or rate of pressure reduction, require low to operator, it is achieved simple.As shown in table 6 and table 7, only need to circulate 3 times just can detect
Go out upper switching value 4050kPa, circulate and can detect lower switching value 3859kPa 4 times, with embodiment 1 and the result of embodiment 2
Difference less than ormal weight δ, it is ensured that the accuracy of testing result.The testing result of the upper switching value of table 2 embodiment 1
The testing result of the lower switching value of table 3 embodiment 1
The testing result of the upper switching value of table 4 embodiment 2
The testing result of the lower switching value of table 5 embodiment 2
The testing result of the upper switching value of table 6 embodiment 3
The testing result of the lower switching value of table 7 embodiment 3
It will be appreciated by those skilled in the art that these embodiments or embodiment to be merely to illustrate the present invention and be not intended to this
The scope of invention, the various equivalent variations being made the present invention and amendment belong to the disclosure of invention.
Claims (10)
1. by a method for detection device detection pressure switch switching value,
Wherein, described detection device includes pressure generator, pressure transducer and pressure piping, is sent out by pressure by pressure piping
Raw device, pressure transducer connect with described pressure switch, and the pressure adjusted in described pressure piping by pressure generator is big
Little, and make the on off operating mode of described pressure switch switch, described detection device uses described detection pressure switch switching value
Method detect the switching value of described pressure switch,
The method of described detection pressure switch switching value is characterised by, comprises the following steps:
Initial value obtaining step, obtain described pressure switch in boost process state switching time force value as on switching value
Initial value R0And the rate of pressure rise of correspondence is as rate of pressure rise initial value v10, or in pressure reduction during pressure switch state switching
Force value as lower switching value initial value F0And the rate of pressure reduction of correspondence is as rate of pressure reduction initial value v20；
Detected value obtaining step, obtain described pressure switch in boost process state switching time force value as on switching value
Detected value RiAnd the rate of pressure rise v of correspondence1i, or in pressure reduction state switching time force value detect as lower switching value
Value FiAnd the rate of pressure reduction v of correspondence2i, wherein, i=1,2,3...；
Estimated value obtaining step, the upper switching including upper switching value initial value that nearest twice or more than twice is got
Value detected value or the lower switching value detected value including lower switching value initial value are fitted estimating, obtain described pressure switch
Upper switching value estimated valueOr lower switching value estimated valueWherein, r=1,2,3...；
Judge step, in the upper switching value estimated value got nearest twice or more than twice or lower switching value estimated value
Big difference between value and minima compares with ormal weight δ, when described difference is more than or equal to described ormal weight δ, returns
Return described detected value obtaining step；When described difference is less than described ormal weight δ, the described upper switching value that the last time is obtained
Estimated value or lower switching value estimated value are as the upper switching value of described pressure switch or lower switching value.
The method of detection pressure switch switching value the most according to claim 1, it is characterised in that in described judgement step,
Described ormal weight δ is setting accuracy, and its value is in the range of 0.2-0.5 times of described pressure switch precision.
The method of detection pressure switch switching value the most according to claim 1 and 2, it is characterised in that described detected value obtains
Taking in step, rate of pressure rise or rate of pressure reduction during to meet the switching of this pressure switch state are cut with pressure switch state last time
Rate of pressure rise v when changing1(i-1)Or rate of pressure reduction v2(i-1)Different modes obtains upper switching value detection during pressure switch switching
Value RiOr lower switching value detected value Fi。
4. according to the method for the detection pressure switch switching value described in any one of claims 1 to 3, it is characterised in that described inspection
In measured value obtaining step, by rate of pressure rise or rate of pressure reduction compared with rate of pressure rise v during pressure switch state switching last time1(i-1)Or
Rate of pressure reduction v2(i-1)Reduce, change described pipe with the rate of pressure rise after this reduction or rate of pressure reduction plus a speed adjustment amount
Pressure in road.
The method of detection pressure switch switching value the most according to claim 4, it is characterised in that described detected value obtains step
Speed adjustment amount in Zhou along with the force value in pressure piping close to last time obtain including upper switching value initial value
Upper switching value detected value or the lower switching value detected value including lower switching value initial value and diminish.
The method of detection pressure switch switching value the most according to claim 5, it is characterised in that described speed adjustment amount is
The function of pipeline inner pressure value, described function representation is Δ Vij=k (Ri-1-pj), described rate of pressure rise is expressed as Vij=θ v1(i-1)
+ΔVij, wherein, Δ VijIt is that the jth in the i-th detected value obtaining step detects the speed adjustment amount walked, VijIt is that the i-th detected value obtains
Take the rate of pressure rise in step, v1(i-1)Boosting speed when being to obtain upper switching value detected value in (i-1) detected value obtaining step
Rate, Ri-1For the upper switching value detected value detected in (i-1) detected value obtaining step, pjFor walking institute in the detection of described jth
The force value in pressure piping being detected, k is pressure regulation, and θ is speed regulation, and meets k >=0,0 ＜ θ ＜ 1, i=1,
2,3 ..., j=1,2,3 ....
7. according to the method for the detection pressure switch switching value described in claim 5 or 6, it is characterised in that described speed adjusts
Amount is the function of pipeline inner pressure value, and described function representation is Δ Vij=k (pj-Fi-1), described rate of pressure reduction is expressed as Vij=θ
v2(i-1)+ΔVij, wherein, Δ VijIt is that the jth in the i-th detected value obtaining step detects the speed adjustment amount walked, VijIt it is the i-th detection
Rate of pressure reduction in value obtaining step, v2(i-1)Fall when being to obtain lower switching value detected value in (i-1) detected value obtaining step
Pressure speed, Fi-1For the lower switching value detected value detected in (i-1) detected value obtaining step, pjFor detecting in described jth
Force value in the detected pressure piping of step, k is pressure regulation, and θ is speed regulation, and meets k >=0,0 ＜ θ ＜ 1, i
=1,2,3 ..., j=1,2,3 ....
8. according to the method for the detection pressure switch switching value described in any one of claim 1 to 7, it is characterised in that described
In estimated value obtaining step, use polynomial fitting method based on least square to upper switching value detected value and rate of pressure rise or
The relation of lower switching value detected value and rate of pressure reduction is fitted estimating, and by rate of pressure rise or rate of pressure reduction when being zero corresponding
Switching value estimated value is as upper switching value estimated value or lower switching value estimated value.
9. according to the method for the detection pressure switch switching value described in any one of claim 1 to 8, it is characterised in that described
In initial value obtaining step, change the pressure in described pressure piping with rate of pressure rise faster or rate of pressure reduction, until detection
The on off operating mode going out described pressure switch switches, and obtains force value when described pressure switch state switches as upper switching
Value initial value RiOr lower switching value initial value Fi, rate of pressure rise when described pressure switch state is switched or rate of pressure reduction as
Rate of pressure rise initial value v1iOr rate of pressure reduction initial value v2i。
10. detect a device for pressure switch switching value, including pressure generator, pressure transducer and pressure piping, pass through
Pressure generator, pressure transducer are connected by pressure piping with described pressure switch, adjust described pressure by pressure generator
Pressure size in solenoid road and make the on off operating mode of described pressure switch switch, it is characterised in that also include initial value
Acquiring unit, detected value acquiring unit, estimated value acquiring unit and judging unit, wherein:
Initial value acquiring unit, controls described pressure generator and changes the pressure in pressure piping, obtain described pressure switch and exist
In boost process, force value during state switching is as upper switching value initial value R0And the rate of pressure rise of correspondence is as boosting speed
Rate initial value v10, or force value when pressure switch state switches in pressure reduction 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 described pressure generator and changes the pressure in pressure piping, obtain described pressure switch and exist
In boost process, force value during state switching is as upper switching value detected value RiAnd the rate of pressure rise v of correspondence1i, or in blood pressure lowering
During state switching time force value as lower switching value detected value FiAnd the rate of pressure reduction v of correspondence2i, wherein, i=1,2,
3...；
Estimated value acquiring unit, receives the data value that described detected value acquiring unit obtains, obtains nearest twice or more than twice
The upper switching value detected value including upper switching value initial value got or the lower switching including lower switching value initial value
Value detected value is fitted estimating, obtains the upper switching value of described pressure switchEstimated value or lower switching value estimated valueIts
In, r=1,2,3...；
Judging unit, receives the data value that described estimated value acquiring unit obtains, gets nearest twice or more than twice
The difference between maxima and minima in upper switching value estimated value or lower switching value estimated value compares with ormal weight δ,
When described difference is more than or equal to described ormal weight δ, make described detected value acquiring unit obtain operation next time；Work as institute
When stating difference less than described ormal weight δ, the described upper switching value estimated value obtained the last time or lower switching value estimated value are made
Upper switching value or lower switching value for described pressure switch.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
| US16/089,502 US11156517B2 (en) | 2016-03-31 | 2016-04-27 | Method and device for detecting switching value of pressure switch |
| EP16896127.4A EP3438680B1 (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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105842616A true CN105842616A (en) | 2016-08-10 |
| CN105842616B CN105842616B (en) | 2018-07-31 |
Family
ID=56596591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610202573.1A Active CN105842616B (en) | 2016-03-31 | 2016-03-31 | A kind of variable Rate approaches the device and method of detection pressure switch switching value |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105842616B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113390452A (en) * | 2021-06-16 | 2021-09-14 | 北京康斯特仪表科技股份有限公司 | Method and device for calibrating switch type instrument |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100281954A1 (en) * | 2008-11-24 | 2010-11-11 | Korea Hydro & Nuclear Power Co., Ltd. | Test apparatus and method for safety valve |
| 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 |
-
2016
- 2016-03-31 CN CN201610202573.1A patent/CN105842616B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100281954A1 (en) * | 2008-11-24 | 2010-11-11 | Korea Hydro & Nuclear Power Co., Ltd. | Test apparatus and method for safety valve |
| 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 |
|---|
| 张剑平: "压力开关智能化动态测试系统设计", 《传感器世界》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113390452A (en) * | 2021-06-16 | 2021-09-14 | 北京康斯特仪表科技股份有限公司 | Method and device for calibrating switch type instrument |
| CN113390452B (en) * | 2021-06-16 | 2023-08-18 | 北京康斯特仪表科技股份有限公司 | Method and device for calibrating switch type instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105842616B (en) | 2018-07-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105865765A (en) | Apparatus and method for detecting switching value of pressure switch | |
| CN109541349B (en) | Proportional solenoid valve online performance detection method and proportional solenoid valve online performance detection device | |
| CN105785263A (en) | Method and device for detecting switching value of pressure switch | |
| CN104375082A (en) | Intelligent SF6 density relay calibration device and method | |
| CN105842095A (en) | Computer controlled metal material indentation load-displacement data measurement system | |
| CN102679931B (en) | Novel method for measuring fatigue crack propagation length in situ | |
| CN102499625A (en) | Infrared remote control vision automatic measuring device and testing device | |
| KR101920922B1 (en) | Apparatus for diagnosing pneumatic control valve and method thereof | |
| CN108195463B (en) | Laser power test system, method and storage medium | |
| CN101080616B (en) | Electronic balance with windshield | |
| CN108051037A (en) | A kind of syringe pump flow calibrating device and calibration method | |
| CN205450209U (en) | Detect device of pressure switch switching value | |
| CN105842616A (en) | Device and method of detecting pressure switch switching values | |
| KR101003386B1 (en) | test apparatus for Breath Alcohol Analyzers in variable atmospheric pressure | |
| US11781899B2 (en) | Method for the verification of pipettes | |
| CN106768937B (en) | A kind of gear pump informationization intelligent test system and test method | |
| CN116662800A (en) | Rolling bearing fault diagnosis method based on self-adaptive attention mechanism | |
| CN216484846U (en) | Calibration device | |
| WO2017166349A1 (en) | Method and device for detecting switching value of pressure switch | |
| EP4314753A1 (en) | System and method for dynamic signal processing for vacuum decay leak detection | |
| CN108678939B (en) | Method and system for detecting steam etching residue value of water pump | |
| JP2021188962A (en) | Sensor drift diagnosing device, sensor drift diagnosing method and sensor drift diagnosing program | |
| CN109520722A (en) | safety valve pressure relief performance test system and method | |
| CN111257702B (en) | New energy automobile controller's withstand voltage test system | |
| CN100570376C (en) | The method of doorsill speed inverse-pulling automatically testing start-up current of steering engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |