CN109884341B - Method and system for automatically calibrating differential pressure zero value of wind speed measurement - Google Patents
Method and system for automatically calibrating differential pressure zero value of wind speed measurement Download PDFInfo
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Abstract
The invention discloses a method and a system for automatically calibrating a differential pressure zero value of wind speed measurement. The invention provides a method for automatically calibrating a differential pressure zero value of flow velocity measurement, wherein the automatic calibration of the differential pressure zero value comprises automatic calibration of first power-on and cyclic calibration in the measurement process, the automatic calibration during the first power-on accurately assigns an initial value of the differential pressure zero value of a micro-differential pressure wind speed measuring instrument, and the cyclic calibration in the measurement process can automatically calibrate the differential pressure zero value according to environmental temperature parameters of a micro-differential pressure wind speed sensor, so that the influence of temperature drift and zero drift on a wind speed measurement value is corrected, and the accuracy of the measurement result is improved.
Description
Technical Field
The invention relates to the field of wind speed monitoring of underground coal mine pipelines, in particular to a method and a system for automatically calibrating a pressure difference zero value of wind speed measurement.
Background
The wind speed monitoring is an important parameter index for the underground safe production of a coal mine, the technical level of the wind speed monitoring is a foundation stone for ensuring the underground safe production of the coal mine, a micro-differential pressure wind speed sensor based on a differential pressure principle is generally adopted to measure the underground wind speed of the coal mine, and due to the comprehensive influence of multiple reasons such as the inherent unconventional, multi-valued corresponding delay nonlinear characteristic, temperature zero drift characteristic, time drift uncertainty and the like of a micro-differential pressure element, the lower limit precision of the existing micro-differential pressure wind speed measuring instrument can only reach 0.4m/s, the measurement of the micro-differential pressure wind speed measuring instrument on the full range of the wind speed is hindered, and among numerous factors, the temperature zero drift of the micro-differential pressure element has a large influence on the lower limit precision of the micro-differential pressure wind speed measuring instrument.
Therefore, a method for overcoming the temperature zero drift of the micro differential pressure element and automatically calibrating the pressure difference zero measurement value in real time is needed.
Disclosure of Invention
In view of this, the present invention provides a method for automatically calibrating a pressure difference zero point value for wind speed measurement, which can automatically calibrate and update the pressure difference zero point value, thereby correcting the influence of temperature change on a wind speed measurement value, ensuring the accuracy of the pressure difference zero point value, improving the accuracy of a measurement lower limit of a gas flow rate, realizing full-scale measurement of a wind speed of 0-15m/s, and ensuring the accuracy of the wind speed measurement.
The invention provides a method for automatically calibrating a differential pressure zero value of wind speed measurement, which is characterized by comprising the following steps of: the method comprises the following steps:
s1: judging whether the micro differential pressure wind speed measuring instrument is powered on for the first time, if so, entering step S2, otherwise, entering step S4;
s2: controlling the electromagnetic valve to be electrified, and recording the value of the micro differential pressure sensor when the positive pressure port and the negative pressure port of the micro differential pressure wind speed measuring instrument are communicated, wherein the value of the micro differential pressure sensor when the positive pressure port and the negative pressure port are communicated is a differential pressure zero value;
s3: clearing a timer of the micro differential pressure wind speed sensor and starting timing;
s4: controlling the electromagnetic valve to lose power, and recording the value of the micro differential pressure sensor when a positive pressure port and a negative pressure port of the micro differential pressure wind speed measuring instrument are in a non-communicated state, wherein the value of the micro differential pressure sensor is a differential pressure measured value when the positive pressure port and the negative pressure port are in the non-communicated state;
s5: calculating a differential pressure value between the differential pressure measurement value and a differential pressure zero value, comparing the differential pressure value with a preset differential pressure threshold value, and if the differential pressure value is greater than the preset differential pressure threshold value, entering a step S6, otherwise, entering a step S4;
s6: comparing the wind speed value with a preset wind speed threshold, if the wind speed value is smaller than the preset wind speed threshold, entering a step S7, otherwise, entering a step S4;
s7: comparing the timer timing with the preset time interval, if the timer timing is greater than the preset time interval, proceeding to step S2, otherwise, proceeding to step S4.
Further, the step S6 includes comparing the differential pressure threshold corresponding to the determined differential pressure value with a differential pressure threshold and a wind speed empirical comparison table, and determining the wind speed threshold.
Further, the differential pressure value threshold value and the wind speed threshold value have the following corresponding relation,
the larger the differential pressure value threshold value is, the larger the wind speed threshold value is.
Correspondingly, the invention also provides a system for automatically calibrating the differential pressure zero value of the wind speed measurement, which is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a micro-differential pressure wind speed measuring instrument for measuring wind speed,
the micro differential pressure sensor is used for detecting and outputting pressure values of a positive pressure port and a negative pressure port of the micro differential pressure wind speed measuring instrument;
and the central processing unit is connected with the output end of the micro differential pressure sensor and used for receiving the output value of the micro differential pressure sensor, calculating the differential pressure value, determining a wind speed threshold value, further judging a time interval when the wind speed is less than the wind speed threshold value, outputting a control signal when the differential pressure value, the wind speed threshold value and the time interval are all met, controlling the conduction of an electromagnetic valve and automatically updating a differential pressure zero point value.
Furthermore, the system for automatically calibrating the differential pressure zero value of the wind speed measurement further comprises a timing unit, wherein the timing unit is connected with the central processing unit and is used for timing the time interval between two adjacent differential pressure zero value automatic calibration and outputting a time signal to the central processing unit.
Furthermore, the system for automatically calibrating the differential pressure zero value of the wind speed measurement further comprises two temperature sensors, wherein the output ends of the temperature sensors are connected with the central processing unit, and the two temperature sensors are respectively used for measuring the ambient temperature of the micro-differential pressure wind speed measuring instrument and the real-time temperature inside the micro-differential pressure wind speed measuring instrument.
Further, the system for automatically calibrating the differential pressure zero value of the wind speed measurement further comprises a counting unit, wherein the output end of the counting unit is connected with the input end of the central processing unit and is used for recording the updating times of the differential pressure zero value and enabling the central processing unit to update the updating times of the differential pressure zero value.
The invention has the beneficial effects that: the invention provides a method for automatically calibrating a differential pressure zero value of flow velocity measurement, wherein the automatic calibration of the differential pressure zero value comprises automatic calibration of first power-on and cyclic calibration in the measurement process, the automatic calibration during the first power-on accurately assigns an initial value of the differential pressure zero value of a micro-differential pressure wind speed measuring instrument, and the cyclic calibration in the measurement process can automatically calibrate the differential pressure zero value according to environmental temperature parameters of a micro-differential pressure wind speed sensor, so that the influence of temperature drift on a wind speed measurement value is corrected, the accuracy of the measurement result is improved, the accuracy of a wind speed measurement lower limit is realized, the full-range measurement of the wind speed of 0-15m/s is realized, and the accuracy of the wind speed measurement is ensured.
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The invention is further described below with reference to the following figures and examples:
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic block diagram of the present invention.
Detailed Description
Fig. 1 is a flow chart of the present invention, fig. 2 is a schematic block diagram of the present invention, and the present invention is further explained below with reference to the accompanying drawings, and the present invention provides a method for automatically calibrating a zero value of a differential pressure of a wind speed measurement, which is characterized in that: the method comprises the following steps:
s1: judging whether the micro differential pressure wind speed measuring instrument is powered on for the first time, if so, entering step S2, otherwise, entering step S4;
s2: controlling the electromagnetic valve to be electrified, and recording the value of the micro differential pressure sensor when the positive pressure port and the negative pressure port of the micro differential pressure wind speed measuring instrument are communicated, wherein the value of the micro differential pressure sensor when the positive pressure port and the negative pressure port are communicated is a differential pressure zero value;
s3: clearing a timer of the micro differential pressure wind speed sensor and starting timing;
s4: controlling the electromagnetic valve to lose power, recording the value of the micro differential pressure sensor when a positive pressure port and a negative pressure port of the micro differential pressure wind speed measuring instrument are in a non-communicated state, wherein the value of the micro differential pressure sensor is a differential pressure measured value when the positive pressure port and the negative pressure port are in the non-communicated state, and calculating the wind speed and outputting the wind speed by the micro differential pressure wind speed measuring instrument according to the differential pressure measured value and a differential pressure zero point value;
s5: calculating a differential pressure value between the differential pressure measurement value and a differential pressure zero value, comparing the differential pressure value with a preset differential pressure threshold value, and if the differential pressure value is greater than the preset differential pressure threshold value, entering a step S6, otherwise, entering a step S4;
s6: comparing the wind speed value with a preset wind speed threshold, if the wind speed value is smaller than the preset wind speed threshold, entering a step S7, otherwise, entering a step S4;
s7: comparing the timer timing with the preset time interval, if the timer timing is greater than the preset time interval, proceeding to step S2, otherwise, proceeding to step S4.
The automatic calibration of the differential pressure zero value comprises automatic calibration during first power-on and automatic calibration during measurement, when the micro differential pressure wind speed measuring instrument finishes measurement, the automatic calibration of the differential pressure zero value is finished, if the micro differential pressure wind speed measuring instrument receives a clear exit signal, the automatic calibration is stopped, and if the micro differential pressure wind speed measuring instrument is powered off, the automatic calibration is exited.
In the present embodiment, the wind speed is calculated by the following method,
wherein V represents a wind speed value, K represents a Pitot tube coefficient, P1 represents a pressure difference measurement value, P0 represents a pressure difference zero value, and ρ represents the density of the gas, wherein the current density of the gas can be found out according to the gas components, and then the standard condition density can be found out according to the current temperature, pressure, humidity and the likeThe parameters are converted into the current working condition density, wherein the humidity is detected by a humidity sensor, the temperature is detected by a temperature sensor, and the pressure is detected by a pressure sensor.
In the process of measuring the flow velocity, the minimum wind velocity measured by the existing wind velocity measuring instrument based on the differential pressure principle is 0.4m/s, and due to the influence of a differential pressure zero point value and zero point drift, for the flow velocity with the actual wind velocity lower than 0.4m/s, the error of the measured differential pressure value is greatly increased, so that the gas flow velocity lower than 0.4m/s cannot be measured. In the actual measurement process of the gas flow velocity under the coal mine, the gas flow velocity lower than 0.4m/s is often also a main component of wind speed monitoring and is an important parameter for the safety function under the coal mine, but the measurement precision of the existing measurement method cannot monitor the gas flow velocity with the wind speed lower than 0.4 m/s; the wind speed is related to the real pressure difference of the positive pressure port and the negative pressure port of the wind speed measuring instrument, the real pressure difference is the difference between a pressure difference measured value and a pressure difference zero value, the pressure difference zero value is the difference between the positive pressure port and the negative pressure port of the wind speed measuring instrument when the positive pressure port and the negative pressure port are communicated, namely, when the positive pressure port and the negative pressure port are in the same pressure environment, the display value of the micro differential pressure sensor can change along with the temperature change of the micro differential pressure sensor, when the temperature changes, if the zero value of the pressure difference is not corrected in time, the wind speed measurement is inevitably inaccurate, therefore, the invention judges whether the zero point automatic calibration control information needs to be output or not according to the difference value between the pressure measurement value and the differential pressure zero point value of the micro differential pressure wind speed sensor, the wind speed threshold value and the time interval, so that the differential pressure zero point value of the micro differential pressure wind speed sensor is automatically calibrated, the differential pressure zero point value can be calibrated in real time, and the influence of inaccurate differential pressure zero point value can be eliminated in time; according to the method, the pressure difference zero value is automatically calibrated, in the wind speed calculation process, pressure difference negative feedback is formed, so that zero drift is effectively corrected, accurate measurement when the gas flow rate is lower than 0.4m/s is realized, the measured value is ensured to be an accurate pressure difference value, the real wind speed is calculated, high-precision measurement of the gas flow rate of 0-0.4m/s is improved, and full-range measurement of the gas flow rate of 0-15m/s is realized.
The invention provides a method for automatically calibrating a differential pressure zero value of flow velocity measurement, wherein the automatic calibration of the differential pressure zero value comprises automatic calibration of first power-on and cyclic calibration in the measurement process, the automatic calibration during the first power-on accurately assigns an initial value of the differential pressure zero value of a micro-differential pressure wind speed measuring instrument, and the cyclic calibration in the measurement process can automatically calibrate the differential pressure zero value according to environmental temperature parameters of a micro-differential pressure wind speed sensor, so that the influence of temperature drift on a wind speed measurement value is corrected, the accuracy of the measurement result is improved, the accuracy of a wind speed measurement lower limit is realized, the full-range measurement of the wind speed of 0-15m/s is realized, and the accuracy of the wind speed measurement is ensured.
In this embodiment, the step S6 further includes comparing the determined differential pressure threshold corresponding to the differential pressure value with a differential pressure threshold and an empirical wind speed comparison table, and determining the wind speed threshold. The differential pressure value threshold and the wind speed comparison table are preset values, and are determined according to detected historical data and a differential pressure zero value of a micro differential pressure wind speed measuring instrument, for example, the differential pressure threshold is A, B and C, and the wind speed thresholds corresponding to the three differential pressure thresholds are V1, V2 and V3, wherein A is not equal to B is not equal to C, V1 is not equal to V2 is not equal to V3, if A is less than B and less than C, V1 is less than V2 and less than V3, if the current difference value is in the differential pressure threshold A, the wind speed threshold is V1, and if the current difference value is in the differential pressure threshold B, the wind speed threshold is V2.
The larger the differential pressure value threshold value is, the larger the wind speed threshold value is. The wind speed is larger when the difference threshold value is larger, the wind speed is larger when the difference value reaches the difference threshold value, whether the wind speed is smaller than the wind speed threshold value or not is further judged, if the wind speed is larger than the preset wind speed threshold value, the measurement is continued, if the wind speed is smaller than the preset wind speed threshold value, the time interval is further judged, and if the wind speed is smaller than the preset wind speed threshold value, the automatic calibration of the pressure difference zero value is automatically carried out. According to the technical scheme, the measuring accuracy can be effectively guaranteed, the action times of the electromagnetic valve are controlled, and therefore energy consumption is reduced.
Correspondingly, the invention also provides a system for automatically calibrating the differential pressure zero value of the wind speed measurement, which is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a micro-differential pressure wind speed measuring instrument for measuring wind speed,
the micro differential pressure sensor is used for detecting and outputting pressure values of a positive pressure port and a negative pressure port of the micro differential pressure wind speed measuring instrument;
and the central processing unit is connected with the output end of the micro differential pressure sensor and used for receiving the output value of the micro differential pressure sensor, calculating the differential pressure value, determining a wind speed threshold value, further judging a time interval when the wind speed is less than the wind speed threshold value, outputting a control signal when the differential pressure value, the wind speed threshold value and the time interval are all met, controlling the conduction of an electromagnetic valve and automatically updating a differential pressure zero point value.
In this embodiment, the system for automatically calibrating a differential pressure zero value for wind speed measurement further includes a timing unit, and the timing unit is connected to the central processing unit, and is configured to time two adjacent time intervals of automatically calibrating a differential pressure zero value, and output a time signal to the central processing unit.
In this embodiment, the system for automatically calibrating the differential pressure zero value for wind speed measurement further includes two temperature sensors, an output end of each of the two temperature sensors is connected to the central processing unit, and the two temperature sensors are respectively used for measuring an ambient temperature of the micro differential pressure wind speed measuring instrument and a real-time temperature inside the micro differential pressure wind speed measuring instrument.
In this embodiment, the system for automatically calibrating the pressure difference zero point value of the wind speed measurement further comprises a memory, and the memory is in communication connection with the central processing unit and is used for storing and querying data.
In this embodiment, the system for automatically calibrating the pressure difference zero value of the wind speed measurement further includes a counting unit, an output end of the counting unit is connected to an input end of the central processing unit, and the counting unit is configured to record the number of times of updating the pressure difference zero value and update the number of times of updating the pressure difference zero value with the central processing unit. When the differential pressure zero value is updated, the central processing unit reads the counting times of the counting unit, the environment temperature of the temperature sensor and the internal temperature of the micro differential pressure wind speed measuring instrument, and stores the counting times of the differential pressure zero value, the environment temperature of each time of technology and the internal temperature of the micro differential pressure wind speed measuring instrument.
The wind speed of 12.0m/s is measured by adopting a micro differential pressure element produced by a certain manufacturer, the sensor enters a measurement mode after being preheated, but after the measurement value of the sensor is more than 0.01Pa, the display value is refreshed to 11.9m/s again after the sensor waits for 7s, and the requirement that the error of the wind speed sensor is not more than +/-0.2 m/s is met.
The control logic is that after the sensor is electrified for the first time, the central processing unit controls the electromagnetic valve to electrify the miniature electromagnetic valve to realize a zero value P0The control interval time t is set to be 0, the wind speed value V is set to be 0, the central processing unit controls the electromagnetic valve to lose power after the measurement, the pressure difference value of the positive pressure port and the negative pressure port is continuously measured, the continuous measurement of the measured value P1 is realized, the wind speed value is displayed in real time, and the measured value P is judged by the central processing unit1And a zero value P0The difference value of (2) exceeds the difference threshold value, in this embodiment the difference threshold value is 0.01Pa, by looking at the comparison table of the difference threshold value and the wind speed threshold value, the wind speed threshold value is 1.0m/s, the real-time wind speed display value is 0.15m/s, and is less than the wind speed threshold value, and further the relation between the time of the counter and the time threshold value is judged, in this embodiment, the time threshold value t is already 60s, the display of the technical device is 75s, then the central processing unit realizes the measurement of the null point value P0 again by controlling the power on of the electromagnetic valve, updates the null in real time, sets the control interval time point value t to 0 again, the wind speed is set to 0, when the ARM processor judges that the difference value Δ P between the measured value P1 and the null point P0 exceeds 0.01Pa again, the wind speed value V is 3.0m/s, is greater than the wind speed threshold value 1.0m/s, even if the timing of the timer is already greater than the time interval, in this embodiment, namely t is greater than 60s, the ARM processor controls the intelligent control circuit of the electromagnetic valve to enable the miniature electromagnetic valve to keep a power-off state, measurement of the measured value P1 is continued, and the wind speed value V is continuously updated, so that high-precision full-range stable measurement is realized.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (6)
1. A method for automatically calibrating a differential pressure zero value of wind speed measurement is characterized by comprising the following steps: the method comprises the following steps:
constructing a system for automatically calibrating the pressure difference zero value of the wind speed measurement;
s1: judging whether the micro differential pressure wind speed measuring instrument is powered on for the first time, if so, entering step S2, otherwise, entering step S4;
s2: controlling the electromagnetic valve to be electrified, and recording the value of the micro differential pressure sensor when the positive pressure port and the negative pressure port of the micro differential pressure wind speed measuring instrument are communicated, wherein the value of the micro differential pressure sensor when the positive pressure port and the negative pressure port are communicated is a differential pressure zero value;
s3: clearing a timer of the micro differential pressure wind speed sensor and starting timing;
s4: controlling the electromagnetic valve to lose power, and recording the value of the micro differential pressure sensor when a positive pressure port and a negative pressure port of the micro differential pressure wind speed measuring instrument are in a non-communicated state, wherein the value of the micro differential pressure sensor is a differential pressure measured value when the positive pressure port and the negative pressure port are in the non-communicated state;
s5: calculating a differential pressure value between the differential pressure measurement value and a differential pressure zero value, comparing the differential pressure value with a preset differential pressure threshold value, and if the differential pressure value is greater than the preset differential pressure threshold value, entering a step S6, otherwise, entering a step S4;
s6: comparing the wind speed value with a preset wind speed threshold, if the wind speed value is smaller than the preset wind speed threshold, entering a step S7, otherwise, entering a step S4;
s7: comparing the time counted by the timer with a preset time interval, if the time counted by the timer is greater than the preset time interval, entering the step S2, otherwise, entering the step S4;
step S6 further includes comparing the determined differential pressure threshold corresponding to the differential pressure value with a differential pressure threshold and a wind speed empirical comparison table, and determining the wind speed threshold.
2. The method for automatically calibrating the differential pressure zero value of the wind speed measurement according to claim 1, wherein: the differential pressure value threshold value and the wind speed threshold value have the following corresponding relation,
the larger the differential pressure value threshold value is, the larger the wind speed threshold value is.
3. The method for automatically calibrating the differential pressure zero value of the wind speed measurement according to claim 2, wherein: the system for automatically calibrating the differential pressure zero value of the wind speed measurement is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a micro-differential pressure wind speed measuring instrument for measuring wind speed,
the micro differential pressure sensor is used for detecting and outputting pressure values of a positive pressure port and a negative pressure port of the micro differential pressure wind speed measuring instrument;
and the central processing unit is connected with the output end of the micro differential pressure sensor and used for receiving the output value of the micro differential pressure sensor, calculating the differential pressure value, determining a wind speed threshold value, further judging a time interval when the wind speed is less than the wind speed threshold value, outputting a control signal when the differential pressure value, the wind speed threshold value and the time interval are all met, controlling the conduction of an electromagnetic valve and automatically updating a differential pressure zero point value.
4. The method for automatically calibrating the differential pressure zero value of the wind speed measurement according to claim 3, wherein: the system for automatically calibrating the pressure difference zero value of the wind speed measurement further comprises a timing unit, wherein the timing unit is connected with the central processing unit and is used for timing the time interval between two adjacent times of automatic calibration of the pressure difference zero value and outputting a time signal to the central processing unit.
5. The method for automatically calibrating the differential pressure zero value of the wind speed measurement according to claim 3, wherein: the system for automatically calibrating the differential pressure zero value of the wind speed measurement further comprises two temperature sensors, wherein the output ends of the two temperature sensors are connected with the central processing unit, and the two temperature sensors are respectively used for measuring the environment temperature of the micro-differential pressure wind speed measuring instrument and the real-time temperature inside the micro-differential pressure wind speed measuring instrument.
6. The method for automatically calibrating the differential pressure zero value of the wind speed measurement according to claim 3, wherein: the system for automatically calibrating the pressure difference zero value of the wind speed measurement further comprises a counting unit, wherein the output end of the counting unit is connected with the input end of the central processing unit and used for recording the updating times of the pressure difference zero value and enabling the central processing unit to update the pressure difference zero value.
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| CN113671873A (en) * | 2021-08-20 | 2021-11-19 | 中煤科工集团重庆研究院有限公司 | High-precision wind speed detection method for reducing self-calibration power consumption |
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