CN109884341A - The method and system that the pressure difference zero point value of measuring wind speed is calibrated automatically - Google Patents
The method and system that the pressure difference zero point value of measuring wind speed is calibrated automatically Download PDFInfo
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- CN109884341A CN109884341A CN201910227077.5A CN201910227077A CN109884341A CN 109884341 A CN109884341 A CN 109884341A CN 201910227077 A CN201910227077 A CN 201910227077A CN 109884341 A CN109884341 A CN 109884341A
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Abstract
The present invention discloses the method and system that a kind of pressure difference zero point value of measuring wind speed is calibrated automatically, acquire pressure difference zero point value and differential pressure measurement, the differential pressure value between the differential pressure measurement and the pressure difference zero point value is calculated, and according to the differential pressure value, wind speed size and time interval to determine whether re-measuring and update to pressure difference zero point value.The present invention provides the method that a kind of pressure difference zero point value of flow velocity measurement is calibrated automatically, the automatic calibration of the pressure difference zero point value includes the circulation calibration in the automatic calibration and measurement process powered on for the first time, initial value accurate assignment of the calibration to the pressure difference zero point value of differential pressure air speed measuring apparatus automatically when powering on for the first time, circulation calibration in measurement process can be according to the automatic calibrating zero point value of differential pressure air velocity transducer environment temperature parameter, to correct the influence of temperature drift and null offset to measuring wind speed value, the accuracy of measurement result is promoted.
Description
Technical field
The present invention relates to the pressure difference zero point values of underground coal mine air velocity duct monitoring field more particularly to a kind of measuring wind speed certainly
The method and system of dynamic calibration.
Background technique
Air monitoring is the important parameter index of coal mine downhole safety production, and the technical level of air monitoring is to guarantee coal mine
The foundation stone of downhole safety production, the general differential pressure air velocity transducer using based on principle of differential pressure come the wind speed to underground coal mine into
Row measurement, due to unconventional, the corresponding delay nonlinear characteristic of multivalue, temperature null offset spy of differential pressure element inherently
Property and when the drift many reasons such as uncertainty combined influence, cause the lower limit precision of existing differential pressure air speed measuring apparatus can only
Reach 0.4m/s, hinders measurement of the differential pressure air speed measuring apparatus to wind speed gamut, in many factors, differential pressure element
Temperature null offset is affected to the lower limit precision of differential pressure air speed measuring apparatus.
Therefore, a kind of temperature null offset that can overcome differential pressure element simultaneously energy real-time automatic calibrating pressure difference zero point survey is needed
The method of magnitude.
Summary of the invention
In view of this, the present invention provides the method that a kind of pressure difference zero point value of measuring wind speed is calibrated automatically, it being capable of automatic school
Standard simultaneously updates pressure difference zero point value, to correct influence of the temperature change to measuring wind speed value, guarantees the accuracy of pressure difference zero point value,
The precision of the measurement lower limit of lift gas flow velocity, realize wind speed 0-15m/s gamut measurement, it is ensured that measuring wind speed it is accurate
Property.
The present invention provides the method that a kind of pressure difference zero point value of measuring wind speed is calibrated automatically, it is characterised in that: includes:
S1: judge whether differential pressure air speed measuring apparatus is to power on for the first time, if so, S2 is entered step, if it is not, entering step
S4；
S2: control solenoid valve obtains electric, differential pressure sensing when record differential pressure air speed measuring apparatus positive pressure mouth is connected to negative pressure mouth
The value of device, the value of little differential pressure sensor is pressure difference zero point value when the positive pressure mouth is connected to negative pressure mouth；
S3: it resets the timer of differential pressure air velocity transducer and starts timing；
S4: control solenoid valve power loss, when record differential pressure air speed measuring apparatus positive pressure mouth and negative pressure mouth are in non-interconnected state
The value of little differential pressure sensor is pressure difference measurement when the value of little differential pressure sensor, the positive pressure mouth and negative pressure mouth are in non-interconnected state
Value；
S5: calculating the differential pressure value between the differential pressure measurement and pressure difference zero point value, and by the differential pressure value with it is preset
Differential pressure value threshold value is compared, if the differential pressure value is greater than the preset differential pressure value threshold value, is entered step S6, is otherwise entered
Step S4；
S6: the air speed value is compared with preset wind speed threshold value, if the air speed value is less than preset wind speed threshold
Value, enters step S7, otherwise enters step S4；
S7: will be compared when timer with preset time interval, if being greater than between the preset time when timer
Every entering step S2, otherwise enter step S4.
Further, the step S6 further includes, by the corresponding differential pressure value threshold value of the differential pressure value and differential pressure value after determination
Threshold value and wind speed empirical comparisons table compare, and determine the wind speed threshold value.
Further, the differential pressure value threshold value and the wind speed threshold value be there are following corresponding relationship,
The difference threshold is bigger, and the wind speed threshold value is bigger.
Correspondingly, the present invention also provides the systems that a kind of pressure difference zero point value of measuring wind speed is calibrated automatically, it is characterised in that:
Including,
Differential pressure air speed measuring apparatus, for measuring wind speed,
Little differential pressure sensor, pressure value and the output of positive pressure mouth and negative pressure mouth for detecting differential pressure air speed measuring apparatus；
Central processing unit is connect with the output end of the little differential pressure sensor, for receiving the defeated of little differential pressure sensor
It is worth out, calculates the difference, determine wind speed threshold value, further judges time interval when wind speed is less than wind speed threshold value, and
Output control signal, controls solenoid valve conduction, automatically updates pressure difference zero when the difference, wind speed threshold value and time interval all meet
Point value.
Further, the system that the pressure difference zero point value of the flow velocity measurement is calibrated automatically further includes timing unit, the timing
Unit is connect with the central processing unit, for carrying out timing to the automatic prover time interval of the adjacent zero point value of pressure difference twice,
And time signal is exported to central processing unit.
Further, the system that the pressure difference zero point value of the flow velocity measurement is calibrated automatically further includes temperature sensor, the temperature
The output end of degree sensor is connect with the central processing unit, and shown temperature sensor is two, is respectively used to described in measurement
Real time temperature inside the environment temperature and differential pressure air speed measuring apparatus of differential pressure air speed measuring apparatus.
Further, the system that the pressure difference zero point value of the flow velocity measurement is calibrated automatically further includes counting unit, the counting
The output end of unit is connect with central processing unit input terminal, for recording the update times of pressure difference zero point value, and by the pressure
Central processing unit described in the update times of poor zero point value.
Beneficial effects of the present invention: the present invention provides the method that a kind of pressure difference zero point value of flow velocity measurement is calibrated automatically, institute
The automatic calibration for stating pressure difference zero point value includes the circulation calibration in the automatic calibration powered on for the first time and measurement process, when powering on for the first time
Initial value accurate assignment of the automatic calibration to the pressure difference zero point value of differential pressure air speed measuring apparatus, circulation calibration in measurement process
Wind speed can be surveyed to correct temperature drift according to the automatic calibrating zero point value of differential pressure air velocity transducer environment temperature parameter
The influence of magnitude, promotes the accuracy of measurement result, to realize the precision of measuring wind speed lower limit, realizes wind speed 0-15m/s's
Gamut measurement, it is ensured that the accuracy of measuring wind speed.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and examples:
Fig. 1 is flow chart of the invention.
Fig. 2 is the principle of the present invention block diagram.
Specific embodiment
Fig. 1 is flow chart of the invention, and Fig. 2 is the principle of the present invention block diagram, with reference to the accompanying drawing makees the present invention into one
Step explanation, the present invention provide the method that a kind of pressure difference zero point value of measuring wind speed is calibrated automatically, it is characterised in that: include:
S1: judge whether differential pressure air speed measuring apparatus is to power on for the first time, if so, S2 is entered step, if it is not, entering step
S4；
S2: control solenoid valve obtains electric, differential pressure sensing when record differential pressure air speed measuring apparatus positive pressure mouth is connected to negative pressure mouth
The value of device, the value of little differential pressure sensor is pressure difference zero point value when the positive pressure mouth is connected to negative pressure mouth；
S3: it resets the timer of differential pressure air velocity transducer and starts timing；
S4: control solenoid valve power loss, when record differential pressure air speed measuring apparatus positive pressure mouth and negative pressure mouth are in non-interconnected state
The value of little differential pressure sensor is pressure difference measurement when the value of little differential pressure sensor, the positive pressure mouth and negative pressure mouth are in non-interconnected state
Value, the differential pressure air speed measuring apparatus calculate wind speed with pressure difference zero point value according to differential pressure measurement and export；
S5: calculating the differential pressure value between the differential pressure measurement and pressure difference zero point value, and by the differential pressure value with it is preset
Differential pressure value threshold value is compared, if the differential pressure value is greater than the preset differential pressure value threshold value, is entered step S6, is otherwise entered
Step S4；
S6: the air speed value is compared with preset wind speed threshold value, if the air speed value is less than preset wind speed threshold
Value, enters step S7, otherwise enters step S4；
S7: will be compared when timer with preset time interval, if being greater than between the preset time when timer
Every entering step S2, otherwise enter step S4.
Wherein, the automatic calibration of the differential pressure zero point value include automatic calibration when powering on for the first time and in measurement process from
Dynamic calibration, differential pressure air speed measuring apparatus are measured, then the automatic calibration of pressure difference zero point value terminates, and such as work as differential pressure measuring wind speed
Instrument, which receives the specific signal that exits, then to be stopped calibrating automatically, such as when differential pressure air speed measuring apparatus powers off, exits automatic calibration.
In the present embodiment, wind speed calculates by the following method,Its
In, V indicates air speed value, and K indicates that Pitot tube cofficients, P1 indicate that differential pressure measurement, P0 indicate pressure difference zero point value, and ρ indicates gas
Density, wherein gas current density can find mark condition density according to gas componant, further according to Current Temperatures, pressure and humidity etc.
Parameter conversion is at current operating condition density, wherein and humidity is detected by humidity sensor, and temperature is detected by temperature sensor,
Pressure is detected by pressure sensor.
In flow velocity measurement process, the minimum windspeed of the existing air speed measuring apparatus measurement based on differential pressure principle is 0.4m/
S is lower than actual wind speed the flow velocity of 0.4m/s, the pressure difference of measurement due to pressure difference zero point value and the influence of null offset
Error will be significantly increased, and the gas flow rate lower than 0.4m/s is caused to be unable to measure.In the gas flow rate of actual underground coal mine
In measurement process, it is coal mine downhole safety that the gas flow rate lower than 0.4m/s, which is often also the chief component of air monitoring,
The important parameter of effect, but the measurement accuracy of existing measurement method is unable to monitor out the gas flow rate that wind speed is lower than 0.4m/s；
Relevant to wind speed is the true pressure difference of air speed measuring apparatus positive pressure mouth and negative pressure mouth, and the true pressure difference is differential pressure measurement and pressure
The difference of poor zero point value, when the pressure difference zero point value is that air speed measuring apparatus positive pressure mouth and negative pressure mouth are connected, i.e. positive pressure mouth and negative pressure mouth
When in same pressure environment, the show value of the show value of little differential pressure sensor, the little differential pressure sensor can be with elementary errors
The temperature change of pressure sensor and change, when the temperature is changed, such as not in time correct pressure difference zero point value, inevitably result in wind
The inaccuracy of speed measurement, therefore the present invention is according to the difference between the pressure measuring value and pressure difference zero point value of differential pressure air velocity transducer
Value, wind speed threshold value and time interval control information to judge whether to need to export zero point auto-calibration jointly, make differential pressure wind speed
The pressure difference zero point value of sensor is calibrated automatically, real time calibration pressure difference zero point value and can eliminate in time pressure difference zero point value inaccuracy
Influence；This method is by automatic calibrating zero point value, during wind speed calculates, forms pressure difference negative-feedback to effectively repair
Accurate measurement when gas flow rate is lower than 0.4m/s is realized in positive null offset, so that it is guaranteed that measured value is accurate pressure difference, and
True wind speed is calculated, the high-acruracy survey of gas flow rate 0-0.4m/s is improved, realizes the full dose of gas flow rate 0-15m/s
The measurement of journey.
The present invention provides the method that a kind of pressure difference zero point value of flow velocity measurement is calibrated automatically, the pressure difference zero point value it is automatic
Calibration includes the circulation calibration in the automatic calibration and measurement process powered on for the first time, and automatic calibration when powering on for the first time is to differential pressure
The accurate assignment of initial value of the pressure difference zero point value of air speed measuring apparatus, the circulation calibration in measurement process can be passed according to differential pressure wind speed
The automatic calibrating zero point value of sensor environment temperature parameter is promoted and is surveyed to correct influence of the temperature drift to measuring wind speed value
The accuracy of result is measured, to realize the precision of measuring wind speed lower limit, realizes the gamut measurement of wind speed 0-15m/s, it is ensured that wind
The accuracy of speed measurement.
In the present embodiment, the step S6 further includes, by after determination the corresponding differential pressure value threshold value of the differential pressure value with
Differential pressure value threshold value and wind speed empirical comparisons table compare, and determine the wind speed threshold value.The differential pressure value threshold value and the wind speed table of comparisons are
Compare for preset value, is determined according to the historical data of detection, the pressure difference zero point value of differential pressure air speed measuring apparatus, for example, differential pressure
Threshold value be A, B and C, wind speed threshold value corresponding with above three differential pressure threshold value be V1, V2 and V3, wherein A ≠ B ≠ C, then V1 ≠
V2 ≠ V3 such as uses A < B < C, V1 < V2 < V3, if current difference, in differential pressure threshold value A, wind speed threshold value is V1, such as
The current difference of fruit is in differential pressure threshold value B, then wind speed threshold value is V2.
The difference threshold is bigger, and the wind speed threshold value is bigger.I.e. when difference threshold is bigger, wind speed is bigger, works as difference
When reaching difference threshold, further judges whether wind speed is less than wind speed threshold value, then continue to survey if it is greater than preset wind speed threshold value
Amount, cleavage are less than preset wind speed threshold value and then further judge time interval, carry out pressure difference zero point value automatically if all meeting
Automatic calibration.Above-mentioned technical proposal can effectively ensure that the accuracy of measurement, control the action frequency of solenoid valve, to reduce
Energy consumption.
Correspondingly, the present invention also provides the systems that a kind of pressure difference zero point value of measuring wind speed is calibrated automatically, it is characterised in that:
Including,
Differential pressure air speed measuring apparatus, for measuring wind speed,
Little differential pressure sensor, pressure value and the output of positive pressure mouth and negative pressure mouth for detecting differential pressure air speed measuring apparatus；
Central processing unit is connect with the output end of the little differential pressure sensor, for receiving the defeated of little differential pressure sensor
It is worth out, calculates the difference, determine wind speed threshold value, further judges time interval when wind speed is less than wind speed threshold value, and
Output control signal, controls solenoid valve conduction, automatically updates pressure difference zero when the difference, wind speed threshold value and time interval all meet
Point value.
In the present embodiment, the system that the pressure difference zero point value of the measuring wind speed is calibrated automatically further includes timing unit, institute
It states timing unit to connect with the central processing unit, for carrying out the automatic prover time interval of the adjacent zero point value of pressure difference twice
Timing, and time signal is exported to central processing unit.
In the present embodiment, the system that the pressure difference zero point value of the measuring wind speed is calibrated automatically further includes temperature sensor,
The output end of the temperature sensor is connect with the central processing unit, and shown temperature sensor is two, is respectively used to survey
Measure real time temperature inside the environment temperature and differential pressure air speed measuring apparatus of the differential pressure air speed measuring apparatus.
In the present embodiment, the system that the pressure difference zero point value of the measuring wind speed is calibrated automatically further includes memory, described
Memory and central processing unit communicate to connect, storage and inquiry for data.
In the present embodiment, the system that the pressure difference zero point value of the flow velocity measurement is calibrated automatically further includes counting unit, institute
The output end for stating counting unit is connect with central processing unit input terminal, for recording the update times of pressure difference zero point value, and will
Central processing unit described in the update times of the pressure difference zero point value.When pressure difference zero point value updates, the central processing unit
The counts of counting unit, the internal temperature of the environment temperature of temperature sensor and differential pressure air speed measuring apparatus are read, and will
The internal temperature of environment temperature and differential pressure air speed measuring apparatus when the counts of the pressure difference zero point value and each time technology
Internal temperature and storage.
12.0m/s wind speed is measured using the differential pressure element of certain producer production, enters measurement pattern after sensor is preheated,
But after measurement value sensor is greater than 0.01Pa, for sensor after the waiting of 7s, refreshing show value again is 11.9m/s, reaches wind
Fast sensor error is not more than the requirement of ± 0.2m/s.
Its control logic is after sensor powers on for the first time, and central processing unit obtains miniature electromagnetic valve by controlling solenoid valve
Electricity realizes zero point value P0Measurement and update, while control interval time t is set to 0, setting air speed value V is 0, central after measurement
Processing unit controls solenoid valve power loss, continues the pressure difference for measuring positive pressure mouth and negative pressure mouth, realizes the continuous measurement of measured value P1,
And real-time display air speed value, to judge measured value P when central processing unit1With zero point value P0Difference be more than difference threshold, this
Difference threshold is 0.01Pa in embodiment, is checked that difference threshold and wind speed threshold contrast table, acquisition wind speed threshold value are 1.0m/s,
Real-time wind speed show value is 0.15m/s, is less than wind speed threshold value, further judges the time of counter and the relationship of time threshold,
In the present embodiment, time threshold t has been 60s, and technology device is shown as 75s, then central processing unit passes through control solenoid valve
The electric measurement for realizing zero point value P0 again, and real-time update zero point value are obtained, control interval time t is set to 0 again, wind speed setting
It is 0, when arm processor judges the difference DELTA P of measured value P1 and zero point value P0 again above 0.01Pa, air speed value V is 3.0m/
S is greater than wind speed threshold value 1.0m/s, even if the timing of timer has been above time interval, in the present embodiment, i.e., t has been greater than
60s, then arm processor control solenoid valve intelligent control circuit makes miniature electromagnetic valve keep power failure state, continues measured value
The measurement of P1, and continuous updating air speed value V, to realize high-precision gamut stably measured.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (7)
1. the method that a kind of pressure difference zero point value of measuring wind speed is calibrated automatically, it is characterised in that: include:
S1: judge whether differential pressure air speed measuring apparatus is to power on for the first time, if so, S2 is entered step, if it is not, entering step S4；
S2: control solenoid valve obtains electric, little differential pressure sensor when record differential pressure air speed measuring apparatus positive pressure mouth is connected to negative pressure mouth
Value, the value of little differential pressure sensor is pressure difference zero point value when the positive pressure mouth is connected to negative pressure mouth；
S3: it resets the timer of differential pressure air velocity transducer and starts timing；
S4: control solenoid valve power loss, elementary errors when record differential pressure air speed measuring apparatus positive pressure mouth and negative pressure mouth are in non-interconnected state
The value of little differential pressure sensor is differential pressure measurement when the value of pressure sensor, the positive pressure mouth and negative pressure mouth are in non-interconnected state；
S5: calculating the differential pressure value between the differential pressure measurement and pressure difference zero point value, and by the differential pressure value and preset differential pressure
Value threshold value is compared, if the differential pressure value is greater than the preset differential pressure value threshold value, is entered step S6, is otherwise entered step
S4；
S6: the air speed value is compared with preset wind speed threshold value, if the air speed value is less than preset wind speed threshold value, into
Enter step S7, otherwise enters step S4；
S7: will be compared when timer with preset time interval, if being greater than preset time interval when timer, into
Enter step S2, otherwise enters step S4；.
2. the method that the pressure difference zero point value of measuring wind speed according to claim 1 is calibrated automatically, it is characterised in that: the step
Rapid S6 further includes, by the corresponding differential pressure value threshold value of the difference and differential pressure value threshold value and wind speed empirical comparisons table ratio after determination
Compared with determining the wind speed threshold value.
3. the method that the pressure difference zero point value of measuring wind speed according to claim 2 is calibrated automatically, it is characterised in that: the difference
Pressure value threshold value and the wind speed threshold value there are following corresponding relationship,
The differential pressure value threshold value is bigger, and the wind speed threshold value is bigger.
4. the system that a kind of pressure difference zero point value of measuring wind speed is calibrated automatically, it is characterised in that: including,
Differential pressure air speed measuring apparatus, for measuring wind speed,
Little differential pressure sensor, pressure value and the output of positive pressure mouth and negative pressure mouth for detecting differential pressure air speed measuring apparatus；
Central processing unit is connect with the output end of the little differential pressure sensor, for receiving the output valve of little differential pressure sensor,
The difference is calculated, determines wind speed threshold value, further judges time interval when wind speed is less than wind speed threshold value, and in the difference
Output control signal, controls solenoid valve conduction, automatically updates pressure difference zero point value when value, wind speed threshold value and time interval all meet.
5. the system that the pressure difference zero point value of measuring wind speed according to claim 4 is calibrated automatically, it is characterised in that: the stream
The system that the pressure difference zero point value of speed measurement is calibrated automatically further includes timing unit, the timing unit and the central processing unit
Connection, for carrying out timing to the automatic prover time interval of the adjacent zero point value of pressure difference twice, and to when central processing unit output
Between signal.
6. the system that the pressure difference zero point value of measuring wind speed according to claim 4 is calibrated automatically, it is characterised in that: the stream
The system calibrated automatically of pressure difference zero point value of speed measurement further includes temperature sensor, the output end of the temperature sensor with it is described
Central processing unit connection, shown temperature sensor are two, are respectively used to measure the environment of the differential pressure air speed measuring apparatus
Real time temperature inside temperature and differential pressure air speed measuring apparatus.
7. the system that the pressure difference zero point value of measuring wind speed according to claim 4 is calibrated automatically, it is characterised in that: the stream
The system that the pressure difference zero point value of speed measurement is calibrated automatically further includes counting unit, the output end and central processing of the counting unit
The connection of unit input terminal, for recording the update times of pressure difference zero point value, and will be described in the update times of the pressure difference zero point value
Central processing unit.
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