CN109269603A - A kind of coefficient scaling method based on flow sensor - Google Patents
A kind of coefficient scaling method based on flow sensor Download PDFInfo
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- CN109269603A CN109269603A CN201811290626.5A CN201811290626A CN109269603A CN 109269603 A CN109269603 A CN 109269603A CN 201811290626 A CN201811290626 A CN 201811290626A CN 109269603 A CN109269603 A CN 109269603A
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
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Abstract
The invention discloses a kind of coefficient scaling method based on flow sensor, it is internally embedded the coefficient calibration sub-assembly being all made of resistance circuit in flow sensor, the specification size of its each internal resistance is extrapolated according to the voltage value of each resistive branches；The flow sensor includes common end and coefficient output end, and the external voltage excitation signals of common end access, coefficient output end is divided into multiple branches' output d. c. voltage signals according to coefficient accuracy requirement；Corresponding voltage value is obtained after d. c. voltage signal is transported to voltage conditioning circuit and analog to digital conversion circuit calculating, to derive the calibration coefficient value K of the flow sensor.The present invention only needs to increase inside original flow sensor a coefficient calibration sub-assembly, the sub-assembly is formed by several simple resistance combinations, sub-assembly is demarcated using the activation voltage coefficient, k-factor is solidificated in the flow sensor itself by way of hardware, ensure that the ease for use of product.
Description
Technical field
The present invention relates to the Calibrating Technique about Coefficient field of the flow sensor on aircraft, automobile, ship engine pipeline, tools
Body is said, is a kind of coefficient scaling method based on flow sensor.
Background technique
In the middle of the 19th century, since restriction flowmeter, people have gradually built up the theoretical basis of modern age flowmeter.It is modern
All kinds of flowmeters also occur in succession.Such as commercial water meter, gas meter and Venturi tube differential pressure flowmeter.20th century 20~30
Age, and there is orifice plate and nozzle differential pressure flowmeter, suspended body flowmeter, volumetric flowmeter.After the 1950s,
With developing by leaps and bounds for electronic technology, material and processing technology, such as turbine type, electromagnetic type, ultrasonic type and eddy currents flowmeter.
Later period the 1970s, and there are coriolis mass flowmeters.In order to solve various different tested Jie under different condition
Miscellaneous flow instrument has been developed in the flow measurement of matter so far, generally can be divided into ten major class: 1. differential pressure flowmeter,
2. float-type flowmeter, 3. volumetric flowmeter, 4. impeller (turbine) formula flowmeter, 5. electromagnetic type flow meter, 6. fluid oscillating
Formula, 7. ultrasonic flowmeter, 8. thermal flowmeter, 9. coriolis mass flowmeters, 10. open channel (or non-full pipe) formula flowmeter.
The work that China carries out modern age flow measurement technology is later, and flow instrument needed for getting up early is from external import, and 60 years
In generation, has begun with the domestic products such as turbine flowmeter and electromagnetic type flow meter.Present invention is generally directed to turbine type flow sensors
A kind of coefficient scaling method, turbine type flow sensor are internally provided with the blade wheel structure of angle each other, due to the blade of impeller
There is certain angle with flow direction, the impulse force of fluid makes blade have rotating torque, overcomes the page after moment of friction and fluid resistance
Rotation, the stabilization of speed after equalising torque.Under certain condition, revolving speed is directly proportional to flow velocity, since the page has magnetic conductivity, at it
Among permanent magnetic coil, the blade cuts magnetic line of force of rotation periodically changes the magnetic flux of coil, to make coil both ends
Electric impulse signal is induced, the instantaneous flow Q and pulse frequency F in certain range of flow, with the fluid for flowing through sensor
Directly proportional, ratio is just instrument coefficient K.
When instrument coefficient K is that unit volume fluid flows through flowmeter, signal pulse number or unit volume that flowmeter issues
Traffic flow inflow-rate of water turbine timing, the signal pulse number that flowmeter issues.Its calculating formula are as follows:
In formula (1), K is instrument coefficient (1/L or the 1/m of flowmeter3)；N is the signal pulse number (secondary) that flowmeter issues；
V is the fluid volume (m by flowmeter3)；F is the pulse frequency (Hz) that flowmeter issues；qvIt is the volume flow by flowmeter
Measure (m3/s)。
Instrument coefficient K is the major parameter of pulse frequency type flowmeter discharge characteristic, it is by flow measurement calibration equipment mark
It is fixed to obtain, but since the instrument coefficient of each flow sensor is all different, our common practices are inside program
K-factor is written.But each flow sensor in this way can all be equipped with special measurement reforming unit, or carry out largely
After data accumulation select an average data, be written to measurement conversion equipment in, in this way can after allow measurement conversion equipment it is consistent
Property is guaranteed, but can reduce the precision of measurement.
Summary of the invention
The purpose of the present invention is to provide a kind of coefficient scaling method based on flow sensor, it is desirable to provide Yi Zhongjian
The method of single, reliable, versatile flow sensor coefficient calibration, to solve software calibration coefficient bring consistency and
The problem of maintainability.In a kind of coefficient calibration sub-assembly that is internally embedded of flow sensor, the electricity of the coefficient calibration sub-assembly
Road is all made of resistance circuit, and the known calibration COEFFICIENT K and table 1 of each flow sensor of specification selection gist of resistance " are
Number-voltage the table of comparisons " extrapolates each internal resistance according to the requirement that coefficient demarcates the voltage value of each branch in sub-assembly
Specification size.
The coefficient calibration sub-assembly includes common end and coefficient output end, the voltage drive letter outside the access of common end
Number, coefficient output end can be divided into multiple branches according to k-factor required precision, and each branch's output is d. c. voltage signal,
The calibration coefficient value for going out the flow sensor so as to automatic deduction, it is not necessary that calibration coefficient is written in measurement switching software,
It only needs to change resistance in coefficient calibration sub-assembly, is changed by hardware and realize that flow sensor is mutual under different measurement environment
Transsexual and adaptive measuring requirement.
The present invention is achieved through the following technical solutions: a kind of coefficient scaling method based on flow sensor, is passed in flow
Sensor is internally embedded the coefficient calibration sub-assembly being all made of resistance circuit, according to the voltage value of each resistive branches
Extrapolate the specification size of its each internal resistance；The flow sensor includes common end and coefficient output end, common end
Voltage excitation signals outside access, coefficient output end, which is divided into multiple branch's output DC voltages according to coefficient accuracy requirement, to be believed
Number；Corresponding voltage value is obtained after d. c. voltage signal is transported to voltage conditioning circuit and analog to digital conversion circuit calculating, from
And derive the calibration coefficient value K of the flow sensor.
Further, in order to preferably realize the present invention, specifically includes the following steps:
Step F1: coefficient calibration sub-assembly is mounted on inside flow sensor, and coefficient is demarcated by harness and is combined
In the voltage output of part to the voltage output connector of flow sensor；
Step F2: the analog to digital conversion circuit of flow sensor rear end acquires coefficient calibration combination by voltage output connector
The voltage value of part output, is converted into digital quantity signal and is acquired by CPU；
Different formula expressing K coefficients is arranged according to digital quantity voltage signal by step F3:CPU, and resolves K system according to formula
Number, k-factor is solidificated in inside flow sensor.
Further, in order to preferably realize that the present invention, the voltage output of the coefficient calibration sub-assembly are divided into four tunnels, point
It Wei not the integer part of high flow capacity point k-factor data, the fractional part of high flow capacity point k-factor data, low discharge point k-factor data
Integer part, the fractional part of low discharge point L coefficient data；
The voltage range of four tunnel voltage outputs is 0~4.5V, the integer data of corresponding k-factor 1~99, by the number of k-factor
00.00~99.99 is expressed as according to format.
Further, in order to preferably realize the present invention, the coefficient calibration sub-assembly of the flow sensor is all by electricity
Resistance circuit composition, including resistance R1~resistance R12；The resistance R1, resistance R2 parallel output DEN_K0A, resistance R3, resistance R4
Parallel output DEN_K0B, resistance R9, resistance R10 parallel output DEN_K0C, resistance R5, resistance R6 parallel output DEN_K2A, electricity
R7, resistance R8 parallel output DEN_K2B, resistance R11, resistance R12 parallel output DEN_K2C are hindered, bus exports DEN_RETURE；
Wherein DEN_K0A indicates the integer part voltage value of the flow sensor low discharge point k-factor data, DEN_K0B
Indicate that the fractional part voltage value of low discharge point k-factor data, DEN_K2A indicate the flow sensor high flow capacity point k-factor number
According to integer part voltage value, DEN_K2B indicates the fractional part voltage value of the flow sensor high flow capacity point k-factor data,
DEN_K0C, DEN_K2C are standby voltage value, and DEN_RETURE is ground terminal.
Further, in order to preferably realize the present invention, different formula is arranged according to digital quantity voltage signal by the CPU
Expressing K coefficient specifically refers to:
When the k-factor of flow sensor < 100, if the corresponding output of integer part of low discharge point k-factor data
Voltage basic value is 0.75V, and voltage range values are 0.739~0.769V, then corresponding k-factor numerical value is 8, is denoted as K1；
The corresponding output voltage basic value of fractional part of the low discharge point k-factor data is 1.932V, voltage model
Enclosing value is 1.917~1.947V, then corresponding k-factor numerical value is 39, is denoted as K2；
The then low discharge point k-factor of the flow sensor are as follows:
K=K1/100+K2/102+K3/104+ ... (formula 1)
That is:
K=8+39/100=8.39 (2)
High flow capacity point k-factor is similarly calculated according to formula 1；
When the k-factor of flow sensor > 100, the corresponding output voltage basic value of the fractional part of k-factor is expressed as
Integer part is two low, and it is two high that the corresponding output voltage basic value of the integer part of k-factor is expressed as integer part, k-factor
Corresponding output voltage basic value is expressed as the fractional part of k-factor, then the k-factor of the flow sensor are as follows:
K=K1*102+K2+K2/102... (formula 2)
According to the method for formula 1 and formula 2, settable different formulas expressing K coefficient, thus by way of voltage output
K-factor is solidificated in inside each flow sensor.
Further, in order to preferably realize the present invention, the flow sensor further includes voltage conditioning circuit, for for
Coefficient demarcates sub-assembly and provides the feedback voltage of excitation and collection voltages out connector；The input of the voltage conditioning circuit
It holds and is connect with the output end of coefficient calibration sub-assembly, output end is connect with the input terminal of voltage output connector；
The voltage conditioning circuit includes linear voltage regulator D1, resistance R13~resistance R20；The linear voltage regulator access
15V voltage exports voltage of voltage regulation 4.5V；The voltage of voltage regulation is connected respectively to resistance R13, resistance R15, resistance R17, resistance R19
One end, other end connected factor demarcates DEN_K0A, DEN_K0B, DEN_K2ADEN_K2B of sub-assembly output, while successively
Resistance R14, resistance R16, resistance R18, resistance R20 are accessed as current-limiting resistance, after being finally sequentially output and extrapolating conditioning
Voltage value COEFF_K0A, COEFF_K0B, COEFF_K2A, COEFF_K2B.
Further, in order to preferably realize the present invention, the voltage value COEFF_K0A after calculating the conditioning is specifically
Refer to: bleeder circuit being formed by the R13 of resistance R1, resistance R2 and voltage conditioning circuit on coefficient calibration sub-assembly, total voltage is
4.5V has:
U=4.5*R1*R2/ (R1+R2)/(R1*R2/ (R1+R2)+R13) (formula 3)
The voltage value U of COEFF_K0A can be extrapolated according to formula 3.
Further, in order to preferably realize the present invention, the corresponding voltage value of flow sensor k-factor is brought into formula 3
In, with season R1=R2, a reasonable R13 is set, then can calculate resistance R1 and resistance R2 in coefficient calibration sub-assembly
Value, so that k-factor is recorded in the flow sensor by way of hardware resistance.
Working principle:
Coefficient calibration sub-assembly is mounted on inside flow sensor, and coefficient is demarcated to the voltage of sub-assembly by harness
It is output on the voltage output connector of flow sensor；The analog to digital conversion circuit of flow sensor rear end is connected by voltage output
The voltage value for connecing device acquisition coefficient calibration sub-assembly output, is converted into digital quantity signal and is acquired by CPU；CPU is according to number
Different formula expressing K coefficients is arranged in amount voltage signal, and resolves k-factor according to formula, and k-factor is solidificated in flow sensor
It is internal.
Compared with prior art, the present invention have the following advantages that and the utility model has the advantages that
(1) present invention is compared with flow calibration COEFFICIENT K software wrting method, without carrying out software K to every different product
The write-in of coefficient ensure that the consistency of software, it is only necessary to increase a coefficient calibration group inside original flow sensor
Component, the sub-assembly are formed by several simple resistance combinations, demarcate sub-assembly, rear end using the activation voltage coefficient
Signal conversion unit determine the k-factor of the flow sensor by acquiring feedback voltage, i.e., by k-factor by way of hardware
It is solidificated in the flow sensor itself, ensure that the interchangeability and ease for use of product；
(2) present invention and the intellectual sensor, method ratio that cpu circuit is incorporated to universal flow sensor, intellectual sensing
Device is to be fused to cpu circuit in universal flow sensor, while calibration coefficient K being written in CPU, and function is complicated, reliably
Property reduce, the present invention is not necessarily to for complicated cpu circuit being added in flow sensor, it is only necessary to increase by one on original sub-assembly
A simple resistance circuit composition, so that it may it is transmitted to master system after solidifying k-factor and goes to be acquired and apply, it is removable
Good, the high reliablity of plant property；
(3) present invention and the denominator of above-mentioned principle, i.e., compared with calibration coefficient K software wrting method or universal flow
The intellectual sensor, method of sensor is compared, and the present invention, which can also make up turbine type flow sensor, can not carry out open-circuit fault
The technical issues of, by judging the output voltage of increased resistance combination resistance inside flow sensor, judge the flow sensing
Whether device opens a way；
(4) present invention increases calibration k-factor combinational circuit, the circuit is by letter on the basis of traditional flow sensor
Single resistor network composition, the k-factor of different flow sensors is solidificated in resistor network, is converted by the signal of upper level
Device acquires the resistor network, and restores the k-factor value, reaches consistency and transplantable requirement, while according to network electricity
The open-circuit fault of resistance, it can be determined that the open-circuit fault state of flow sensor, solving the type sensor can not judge to open a way
The defect of failure.
Detailed description of the invention
Fig. 1 is flow sensor schematic illustration of the invention；
Fig. 2 is the circuit diagram that coefficient of the invention demarcates sub-assembly；
Fig. 3 is voltage conditioning circuit schematic diagram of the invention.
Specific embodiment
The present invention is described in further detail below with reference to embodiment, embodiments of the present invention are not limited thereto.
Table 1 is that coefficient-voltage resolves the table of comparisons；
Table 1
Embodiment 1:
The present invention is achieved through the following technical solutions, as shown in Figure 1-Figure 3, a kind of coefficient calibration based on flow sensor
Method is internally embedded the coefficient calibration sub-assembly being all made of resistance circuit in flow sensor, according to each electricity
The voltage value of resistance branch extrapolates the specification size of its each internal resistance；The flow sensor includes common end and coefficient
Output end, the voltage excitation signals outside the access of common end, it is defeated that coefficient output end according to coefficient accuracy requirement is divided into multiple branches
D. c. voltage signal out；It is obtained accordingly after d. c. voltage signal is transported to voltage conditioning circuit and analog to digital conversion circuit calculating
Voltage value, to derive the calibration coefficient value K of the flow sensor.
It should be noted that the present invention proposes a kind of coefficient scaling method based on flow sensor by above-mentioned improvement,
It is intended to provide a kind of hardware approach of simple, reliable, versatile flow sensor coefficient calibration, to solve software calibration
The problem of coefficient bring consistency and maintainability.The technical scheme is that: in flow sensor
It is internally embedded a kind of coefficient calibration sub-assembly, the circuit of the coefficient calibration sub-assembly is all made of resistance circuit, resistance
The known calibration COEFFICIENT K and table 1 " coefficient-voltage table of comparisons " of each flow sensor of specification selection gist, are demarcated according to coefficient
The specification size of each internal resistance is extrapolated in the requirement of the voltage value of each branch in sub-assembly.
The coefficient calibration sub-assembly includes common end and coefficient output end, as shown in Fig. 2, outside the access of its common end
Voltage excitation signals, coefficient output end can be divided into multiple branches according to k-factor required precision, and each branch's output is direct current
Voltage signal goes out the calibration coefficient value of the flow sensor so as to automatic deduction, without being written in measurement switching software
Calibration coefficient, it is only necessary to change resistance in coefficient calibration sub-assembly, be changed by hardware and realize flow sensor in different measurements
The requirement of interchangeability and adaptive measuring under environment.
The other parts of the present embodiment are same as the previously described embodiments, and so it will not be repeated.
Embodiment 2:
The present embodiment advanced optimizes on the basis of the above embodiments, as shown in Figure 1-Figure 3, specifically includes following step
It is rapid:
Step F1: coefficient calibration sub-assembly is mounted on inside flow sensor, and coefficient is demarcated by harness and is combined
In the voltage output of part to the voltage output connector of flow sensor；
Step F2: the analog to digital conversion circuit of flow sensor rear end acquires coefficient calibration combination by voltage output connector
The voltage value of part output, is converted into digital quantity signal and is acquired by CPU；
Different formula expressing K coefficients is arranged according to digital quantity voltage signal by step F3:CPU, and resolves K system according to formula
Number, k-factor is solidificated in inside flow sensor.
The other parts of the present embodiment are same as the previously described embodiments, and so it will not be repeated.
Embodiment 3:
The present embodiment advanced optimizes on the basis of the above embodiments, as shown in Figure 1-Figure 3, the coefficient calibration group
The voltage output of component is divided into four tunnels, respectively the integer part of high flow capacity point k-factor data, high flow capacity point k-factor data
Fractional part, the integer part of low discharge point k-factor data, the fractional part of low discharge point L coefficient data；Four tunnel voltage outputs
Voltage range be 0~4.5V, the integer data of corresponding k-factor 1~99, the data format of k-factor is expressed as 00.00~
99.99；
As shown in Fig. 2, the coefficient calibration sub-assembly of the flow sensor is all made of resistance circuit, including resistance R1
~resistance R12；The resistance R1, resistance R2 parallel output DEN_K0A, resistance R3, resistance R4 parallel output DEN_K0B, resistance
R9, resistance R10 parallel output DEN_K0C, resistance R5, resistance R6 parallel output DEN_K2A, resistance R7, resistance R8 parallel output
DEN_K2B, resistance R11, resistance R12 parallel output DEN_K2C, bus export DEN_RETURE.Resistance in parallel is adjustable
Resistance value, to change the value of COEFFICIENT K, the design only needs replacing the resistance in coefficient calibration sub-assembly, and it is whole that no replacement is required
A coefficient demarcates sub-assembly.
Wherein DEN_K0A indicates the integer part voltage value of the flow sensor low discharge point k-factor data, DEN_K0B
Indicate that the fractional part voltage value of low discharge point k-factor data, DEN_K2A indicate the flow sensor high flow capacity point k-factor number
According to integer part voltage value, DEN_K2B indicates the fractional part voltage value of the flow sensor high flow capacity point k-factor data,
DEN_K0C, DEN_K2C are standby voltage value, and DEN_RETURE is used as with rear step voltage conditioning circuit for location.
It should be noted that the voltage range of four tunnel voltage outputs is 0~4.5V, according to pair of table 1 by above-mentioned improvement
According to data, respectively represent the integer data of k-factor value 1-99, thus the data format of its k-factor can be expressed as 00.00~
99.99, if necessary to extended fractional digit precision, as shown in Fig. 2, its reserved other two-way standby voltage output DEN_K0C,
DEN_K2C can extend its data precision.
The other parts of the present embodiment are same as the previously described embodiments, and so it will not be repeated.
Embodiment 4:
The present embodiment advanced optimizes on the basis of the above embodiments, and as shown in Figure 1-Figure 3, the CPU is according to number
Word amount voltage signal is arranged different formula expressing K coefficients and specifically refers to:
When the k-factor of flow sensor < 100, if the corresponding output of integer part of low discharge point k-factor data
Voltage basic value is 0.75V, and according to table 1, voltage range values are 0.739~0.769V, then corresponding k-factor numerical value is
8, it is denoted as K1；
The corresponding output voltage basic value of fractional part of the low discharge point k-factor data is 1.932V, voltage model
Enclosing value is 1.917~1.947V, then corresponding k-factor numerical value is 39, is denoted as K2；
The then low discharge point k-factor of the flow sensor are as follows:
K=K1/100+K2/102+K3/104+ ... (formula 1)
That is:
K=8+39/100=8.39 (2)
High flow capacity point k-factor is similarly calculated according to formula 1；
When the k-factor of flow sensor > 100, then need the corresponding output voltage basic value of the fractional part of k-factor
It is two low to be expressed as integer part, it is two high that the corresponding output voltage basic value of the integer part of k-factor is expressed as integer part,
The corresponding output voltage basic value of k-factor is expressed as the fractional part of k-factor, then the k-factor of the flow sensor are as follows:
K=K1*102+K2+K2/102... (formula 2)
According to the method for formula 1 and formula 2, settable different formulas expressing K coefficient, thus by way of voltage output
K-factor is solidificated in inside each flow sensor.
The other parts of the present embodiment are same as the previously described embodiments, and so it will not be repeated.
Embodiment 5:
The present embodiment advanced optimizes on the basis of the above embodiments, as shown in Figure 1-Figure 3, the flow sensor
Further include voltage conditioning circuit, provides the feedback electricity of excitation and collection voltages out connector for demarcating sub-assembly for coefficient
Pressure；The input terminal of the voltage conditioning circuit is connect with the output end of coefficient calibration sub-assembly, and output end is connect with voltage output
The input terminal of device connects；
The voltage conditioning circuit includes linear voltage regulator D1, resistance R13~resistance R20；The linear voltage regulator access
15V voltage exports voltage of voltage regulation 4.5V；The voltage of voltage regulation is connected respectively to resistance R13, resistance R15, resistance R17, resistance R19
One end, other end connected factor demarcates DEN_K0A, DEN_K0B, DEN_K2ADEN_K2B of sub-assembly output, while successively
Resistance R14, resistance R16, resistance R18, resistance R20 are accessed as current-limiting resistance, after being finally sequentially output and extrapolating conditioning
Voltage value COEFF_K0A, COEFF_K0B, COEFF_K2A, COEFF_K2B.
Voltage value COEFF_K0A after calculating the conditioning is specifically referred to: by resistance R1, the electricity on coefficient calibration sub-assembly
Resistance
The R13 of R2 and voltage conditioning circuit forms bleeder circuit, and total voltage 4.5V has:
U=4.5*R1*R2/ (R1+R2)/(R1*R2/ (R1+R2)+R13) (formula 3)
The voltage value U of COEFF_K0A, the output voltage value calculating method and public affairs of rest channels can be extrapolated according to formula 3
Formula 3 is identical, and so on, no longer it is repeated.
The corresponding voltage value of flow sensor k-factor is brought into formula 3, with season R1=R2, is arranged one reasonably
R13 can then calculate the value of resistance R1 and resistance R2 in coefficient calibration sub-assembly, so that k-factor to be passed through to the side of hardware resistance
Formula is recorded in the flow sensor.
The other parts of the present embodiment are same as the previously described embodiments, and so it will not be repeated.
The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, it is all according to
According to technical spirit any simple modification to the above embodiments of the invention, equivalent variations, protection of the invention is each fallen within
Within the scope of.
Claims (8)
1. a kind of coefficient scaling method based on flow sensor, it is characterised in that: be internally embedded one in flow sensor
Sub-assembly is all demarcated by the coefficient that resistance circuit forms, each inside it is extrapolated according to the voltage value of each resistive branches
The specification size of resistance；The flow sensor includes common end and coefficient output end, the voltage drive outside the access of common end
Signal, coefficient output end are divided into multiple branches according to coefficient accuracy requirement and export d. c. voltage signal；D. c. voltage signal is defeated
Corresponding voltage value is obtained after being sent to voltage conditioning circuit and analog to digital conversion circuit calculating, to derive the flow sensing
The calibration coefficient value K of device.
2. a kind of coefficient scaling method based on flow sensor according to claim 1, it is characterised in that: specifically include
Following steps:
Step F1: coefficient calibration sub-assembly is mounted on inside flow sensor, and coefficient is demarcated by sub-assembly by harness
In voltage output to the voltage output connector of flow sensor；
Step F2: the analog to digital conversion circuit of flow sensor rear end is defeated by voltage output connector acquisition coefficient calibration sub-assembly
Voltage value out is converted into digital quantity signal and is acquired by CPU；
Different formula expressing K coefficients is arranged according to digital quantity voltage signal by step F3:CPU, and resolves k-factor according to formula,
K-factor is solidificated in inside flow sensor.
3. a kind of coefficient scaling method based on flow sensor according to claim 2, it is characterised in that: the coefficient
The voltage output of calibration sub-assembly is divided into four tunnels, the respectively integer part of high flow capacity point k-factor data, high flow capacity point k-factor
The fractional part of data, the integer part of low discharge point k-factor data, the fractional part of low discharge point L coefficient data；
The voltage range of four tunnel voltage outputs is 0~4.5V, the integer data of corresponding k-factor 1~99, by the data lattice of k-factor
Formula is expressed as 00.00~99.99.
4. a kind of coefficient scaling method based on flow sensor according to claim 3, it is characterised in that: the flow
The coefficient calibration sub-assembly of sensor is all made of resistance circuit, including resistance R1~resistance R12；The resistance R1, resistance
R2 parallel output DEN_K0A, resistance R3, resistance R4 parallel output DEN_K0B, resistance R9, resistance R10 parallel output DEN_K0C,
Resistance R5, resistance R6 parallel output DEN_K2A, resistance R7, resistance R8 parallel output DEN_K2B, resistance R11, resistance R12 are in parallel
DEN_K2C is exported, bus exports DEN_RETURE；
Wherein DEN_K0A indicates that the integer part voltage value of the flow sensor low discharge point k-factor data, DEN_K0B indicate
The fractional part voltage value of low discharge point k-factor data, DEN_K2A indicate the flow sensor high flow capacity point k-factor data
Integer part voltage value, DEN_K2B indicate the fractional part voltage value of the flow sensor high flow capacity point k-factor data, DEN_
K0C, DEN_K2C are standby voltage value, and DEN_RETURE is ground terminal.
5. a kind of coefficient scaling method based on flow sensor according to claim 4, it is characterised in that: the CPU
Different formula expressing K coefficients is arranged according to digital quantity voltage signal to specifically refer to:
When the k-factor of flow sensor < 100, if the corresponding output voltage of integer part of low discharge point k-factor data
Basic value is 0.75V, and voltage range values are 0.739~0.769V, then corresponding k-factor numerical value is 8, is denoted as K1；
The corresponding output voltage basic value of fractional part of the low discharge point k-factor data is 1.932V, voltage range values
For 1.917~1.947V, then corresponding k-factor numerical value is 39, is denoted as K2；
The then low discharge point k-factor of the flow sensor are as follows:
K=K1/100+K2/102+K3/104+ ... (formula 1)
That is:
K=8+39/100=8.39 (2)
High flow capacity point k-factor is similarly calculated according to formula 1；
When the k-factor of flow sensor > 100, the corresponding output voltage basic value of the fractional part of k-factor is expressed as integer
Part is two low, and it is two high that the corresponding output voltage basic value of the integer part of k-factor is expressed as integer part, and k-factor is corresponding
Output voltage basic value be expressed as the fractional part of k-factor, then the k-factor of the flow sensor are as follows:
K=K1*102+K2+K2/102... (formula 2)
According to the method for formula 1 and formula 2, settable different formulas expressing K coefficient, thus by K by way of voltage output
Coefficient is solidificated in inside each flow sensor.
6. a kind of coefficient scaling method based on flow sensor according to claim 5, it is characterised in that: the flow
Sensor further includes voltage conditioning circuit, provides excitation and collection voltages out connector for demarcating sub-assembly for coefficient
Feedback voltage；The input terminal of the voltage conditioning circuit is connect with the output end of coefficient calibration sub-assembly, and output end is defeated with voltage
The input terminal connection of connector out；
The voltage conditioning circuit includes linear voltage regulator D1, resistance R13~resistance R20；The linear voltage regulator access 15V electricity
Pressure exports voltage of voltage regulation 4.5V；The voltage of voltage regulation be connected respectively to resistance R13, resistance R15, resistance R17, resistance R19 one
End, other end connected factor are demarcated DEN_K0A, DEN_K0B, DEN_K2ADEN_K2B of sub-assembly output, are sequentially ingressed into simultaneously
Resistance R14, resistance R16, resistance R18, resistance R20 are finally sequentially output as current-limiting resistance and extrapolate the voltage after conditioning
Value COEFF_K0A, COEFF_K0B, COEFF_K2A, COEFF_K2B.
7. a kind of coefficient scaling method based on flow sensor according to claim 6, it is characterised in that: described in reckoning
Voltage value COEFF_K0A after conditioning is specifically referred to: by resistance R1, the resistance R2 and voltage conditioning electricity on coefficient calibration sub-assembly
The R13 on road forms bleeder circuit, and total voltage 4.5V has:
U=4.5*R1*R2/ (R1+R2)/(R1*R2/ (R1+R2)+R13) (formula 3)
The voltage value U of COEFF_K0A can be extrapolated according to formula 3.
8. a kind of coefficient scaling method based on flow sensor according to claim 7, it is characterised in that: pass flow
The corresponding voltage value of sensor k-factor is brought into formula 3, and with season R1=R2, one reasonable R13 of setting can then be calculated and is
The value of resistance R1 and resistance R2 in number calibration sub-assembly, so that k-factor to be recorded to flow biography by way of hardware resistance
In sensor.
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