CN115931215A - Pressure sensor calibration system based on dynamic compensation - Google Patents
Pressure sensor calibration system based on dynamic compensation Download PDFInfo
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Abstract
The invention relates to a pressure sensor calibration system based on dynamic compensation, belonging to the technical field of pressure sensor calibration; the device comprises an air source valve, a pressure reducing valve, a quick charging valve, a micro-flow charging regulating valve, a star meter inlet valve, a star inlet valve, a quick discharge valve, a micro-flow discharging regulating valve, a discharging stop valve, an air tank set, an air charging tank valve, a discharging tank valve, a filter 1-7, an air source pressure gauge, a pressure reducing pressure gauge and a star meter inlet pressure gauge; according to the difference of the volumes of the satellite storage tanks, the pressure on the satellite is quickly set and dynamically and stably controlled by coordinately controlling each valve and adopting the scheme of 'quick large-flow pressure charging and discharging + micro-flow gas dynamic compensation', so that the satellite pressure is kept in a smaller pressure fluctuation range, and the pressure control precision and the pressure calibration working efficiency are improved; the invention is used for accurately setting and maintaining the pressure in the calibration process of the satellite system-level pressure sensor, and improves the accuracy and the calibration efficiency of pressure calibration.
Description
Technical Field
The invention belongs to the technical field of pressure sensor calibration, and relates to a pressure sensor calibration system based on dynamic compensation.
Background
Satellites with propulsion and orbital transfer capabilities are typically equipped with propulsion systems. The remaining amount of propulsion fuel during satellite in-orbit is measured by a pressure sensor of the propulsion system. In order to verify the corresponding relationship between the satellite pressure sensor and the actual pressure, the pressure sensor on the satellite needs to be calibrated by adopting a ground calibration pressure gauge. The pressure calibration level is megapascal (MPa) level, and the precision level is kilopascal level. Meanwhile, in order to verify the difference between the forward direction and the reverse direction of the pressure sensor, the calibration process generally comprises a pressure increasing process and a pressure reducing process. The current pressure calibration is controlled by a common pressure control console, the main means is to adjust the opening degree of a pressure reducer and a needle valve of the control console, and a precision pressure gauge arranged on an air inflation pipeline is adopted to read the pressure data on the satellite. When the inflation process is calibrated, the air pressure of the air source is reduced to be close to a specified pressure value through the console, the air is inflated into the star through the star inlet valve at the rear end, the inflation is stopped after the specified pressure is reached, the pressure in the star is reduced, and the pressure is supplemented for many times after the pressure is stabilized until the pressure reaches the required value. When the air release process is calibrated, the air in the star is released through the star inlet valve, the air release is stopped after the specified pressure is reached, and the air in the star is supplemented and released again after the pressure in the star is stabilized until the pressure reaches the required value. And after the pressure value in the satellite is stabilized within a required range, reading the pressure of the precision pressure gauge and the voltage value of the pressure sensor on the satellite, and calibrating the pressure. The pressure control precision of a common pressure control table is low, and meanwhile, the pressure stability period is long, multiple times of pressure stability are needed, the overall required time is long, and the efficiency is low.
Disclosure of Invention
The technical problem solved by the invention is as follows: the pressure sensor calibration system based on dynamic compensation is used for accurately setting and maintaining pressure in the satellite system-level pressure sensor calibration process, and improves the accuracy and the calibration efficiency of pressure calibration
The technical scheme of the invention is as follows:
a pressure sensor calibration system based on dynamic compensation comprises an air source valve, a pressure reducing valve, a quick charging valve, a micro-flow charging regulating valve, a star meter inlet valve, a quick discharging valve, a micro-flow discharging regulating valve, a discharging stop valve, an air tank group, an air charging tank valve, a discharging tank valve, a filter 1-a filter 7, an air source pressure gauge, a pressure reducing pressure meter and a star meter inlet pressure gauge;
wherein, one end of the filter 1 is connected with an external air source; the other end of the filter 1 is connected with one end of an air source valve;
the other end of the gas source valve is divided into 2 paths, wherein 1 path is sequentially connected with a filter 5 and a gas source pressure gauge; the other 1 path is connected with one end of the pressure reducing valve;
the other end of the pressure reducing valve is divided into 4 paths; the 1 st path is sequentially connected with a filter 6 and a pressure reducing pressure gauge, the 2 nd path is connected with one end of a quick inflation valve, the 3 rd path is connected with one end of a micro-flow inflation regulating valve, and the 4 th path is connected with one end of an inflation tank valve;
the other end of the quick charging valve is divided into 3 paths, and the path 1 is sequentially connected with a filter 7, a star entering pressure gauge valve and a star entering pressure gauge; the 2 nd path is sequentially connected with the filter 3, the satellite inlet valve and an external satellite; the 3 rd path is connected with one end of a filter 4;
the other end of the micro-flow inflation regulating valve is divided into 3 paths, and the 1 st path is sequentially connected with a filter 7, a star entering pressure gauge valve and a star entering pressure gauge; the 2 nd path is sequentially connected with the filter 3, the satellite inlet valve and an external satellite; the 3 rd path is connected with one end of a filter 4;
the other end of the filter 4 is respectively connected with one end of the quick discharge valve and one end of the micro-flow exhaust regulating valve;
the other end of the quick exhaust valve is respectively connected with the other end of the micro-flow exhaust regulating valve, one end of the exhaust stop valve and one end of the exhaust tank valve; the other end of the exhaust stop valve is emptied;
the other end of the micro-flow exhaust regulating valve is respectively connected with the other end of the quick exhaust valve, one end of the exhaust stop valve and one end of the exhaust tank valve;
the other end of the exhaust tank valve is respectively connected with the other end of the inflation tank valve and one end of the filter 2;
the other end of the inflation tank valve is respectively connected with the other end of the exhaust tank valve and one end of the filter 2;
the other end of the filter 2 is connected with the gas tank group;
all meters and valves in the system are connected through pipelines.
In the pressure sensor calibration system based on dynamic compensation, all valves adopt manual control valves; wherein, the air source valve, the star meter inlet valve, the star valve, the exhaust stop valve, the inflation tank valve and the exhaust tank valve are needle valves; the pressure reducing valve is a high-precision pressure regulating valve with the output pressure of 0-4 MPa; the micro-flow air charging regulating valve and the micro-flow exhaust regulating valve are adjustable micro-flow regulating valves with the adjustable flow of 0-1 SLM; the quick charging valve and the quick discharging valve are ball valves; the air source pressure gauge is a common precision electronic pressure gauge of 0-25 MPa; the pressure reducing pressure gauge is a common precision electronic pressure gauge with 0-10 MPa; the star entering pressure gauge is a precise electronic pressure gauge with the resolution ratio not lower than 100 Pa; the filters 1-7 are all metal filter screen type filters with filtering precision superior to 10 um; the gas tank group comprises 3 gas tanks, the volume of each gas tank is 500mL, and the gas tanks are connected through valves and pipelines.
In the above pressure sensor calibration system based on dynamic compensation, the pressure calibration process is divided into an inflation process pressure calibration and a deflation process pressure calibration;
the specific control method for calibrating the pressure in the inflation process comprises the following steps:
all valves are set to be in a closed state;
opening a star meter inlet valve and keeping the star meter inlet valve in an open state all the time; opening a gas source valve to provide gas for a rear-end pipeline;
adjusting a pressure reducing valve, setting the output inflation pressure to be a required value p1+0.1MPa, and monitoring the pressure through a pressure reducing pressure gauge;
opening a quick charging valve and a star inlet valve, and charging a satellite storage box on an air path of the star inlet valve;
when the indication value of the star entering pressure meter reaches the required value p1, closing the quick charging valve;
when the volume Va of the satellite storage tank is more than or equal to 10L, a constant flow dynamic compensation mode is adopted, and the satellite is inflated in a micro-flow mode to compensate pressure reduction caused by temperature reduction of the storage tank; when the volume Va of the satellite storage tank is less than 10L, a quantitative gas dynamic compensation mode is adopted, and the satellite is inflated in a micro-flow mode to compensate pressure change caused by temperature change of the storage tank; when the volume and the temperature of the satellite storage tank are unknown, a variable flow dynamic compensation mode is adopted to inflate the satellite in a micro-flow mode so as to compensate the pressure drop caused by the temperature reduction of the storage tank, and the pressure fluctuation value of the satellite entering pressure gauge is maintained in the fluctuation range of the required value;
and after confirming that the pressure variation range is within the fluctuation range of the required value, carrying out pressure calibration data acquisition work, and reading the voltage value of the pressure sensor to be calibrated and the indication value of the star entering pressure meter.
In the above pressure sensor calibration system based on dynamic compensation, the constant flow dynamic compensation mode specifically includes:
adjusting the output pressure of the pressure reducing valve to p1+0.1MPa; according to the difference value delta T between the volume size Va of the storage tank and the temperature T1 of the storage tank and the room temperature T2, delta T = T1-T2, in a constant flow dynamic compensation mode k-delta T curve in the inflation process, an opening value k1 is searched, a micro-flow inflation regulating valve is set to k1, and the satellite is inflated in a micro-flow mode to compensate pressure reduction caused by temperature reduction of the storage tank.
In the above pressure sensor calibration system based on dynamic compensation, the quantitative gas dynamic compensation mode specifically includes:
opening an air tank valve, and setting air tank group volume combination Vb, vb = Va/100 according to the volume size Va and the difference value delta T between the temperature of the storage tank and the room temperature; opening a valve of the inflation tank, and pressurizing the gas tank group to p2 by using a pressure reducing valve, wherein p2= p1+0.3Mpa; then closing the pressure reducing valve, and searching an opening value k2 in a quantitative gas dynamic compensation mode k-delta T curve in the inflation process; and (5) regulating the micro-flow inflation to k2, and inflating the satellite in a micro-flow mode to compensate pressure change caused by temperature change of the storage tank.
In the above pressure sensor calibration system based on dynamic compensation, the variable flow dynamic compensation mode specifically includes:
adjusting the output pressure of the pressure reducing valve to be p1+0.1MPa, dynamically adjusting and setting the opening of the micro-flow inflation adjusting valve, and inflating the satellite in a micro-flow mode.
In the above pressure sensor calibration system based on dynamic compensation, the specific control method of the pressure calibration in the air bleeding process is as follows:
all valves are set to be in a closed state;
opening a star meter inlet valve and keeping the star meter inlet valve in an open state all the time;
opening an exhaust stop valve;
opening an adjusting quick exhaust valve, discharging gas in the star, and closing the quick exhaust valve when the indication value of a star entering pressure meter reaches a required value p 1;
when the volume Va of the satellite storage tank is more than or equal to 10L, a constant flow dynamic compensation mode is adopted, and the satellite is exhausted in a micro-flow mode to compensate pressure change caused by temperature change of the storage tank; when the volume Va of the satellite storage tank is less than 10L, a quantitative gas dynamic compensation mode is adopted, and the satellite is exhausted in a micro-flow mode to compensate pressure change caused by temperature change of the storage tank; under the condition of unknown volume and temperature of the storage tank, a variable flow dynamic compensation mode is adopted to maintain the pressure fluctuation value of the star entering pressure gauge within a fluctuation range;
and after confirming that the pressure variation range is within the fluctuation range, carrying out pressure calibration data acquisition work, and reading the voltage value of the pressure sensor to be calibrated and the indication value of the star entering pressure meter.
In the above pressure sensor calibration system based on dynamic compensation, the constant flow dynamic compensation mode specifically includes:
according to the volume size Va of the storage tank, the difference value delta T between the temperature T1 of the storage tank and the room temperature T2, delta T = T1-T2, in a constant flow dynamic compensation mode k-delta T curve in the deflation process, an opening value k3 is searched; and opening and adjusting the micro-flow exhaust regulating valve to k3, and exhausting the satellite by adopting a micro-flow mode to compensate the pressure change caused by the temperature change of the storage tank.
In the above pressure sensor calibration system based on dynamic compensation, the quantitative gas dynamic compensation mode specifically includes:
opening an exhaust tank valve, and setting a tank group volume combination Vb, vb = Va/100 according to the volume size Va of the storage tank and the difference delta T between the temperature of the storage tank and the room temperature; and after the gas in the gas tank set is exhausted, the exhaust stop valve is closed, the opening value k4 is searched in a quantitative gas dynamic compensation mode k-delta T curve in the gas discharging process, the micro-flow exhaust regulating valve is regulated and set to k4, and the satellite is exhausted by adopting a micro-flow mode to compensate the pressure change caused by the temperature change of the storage tank.
In the above pressure sensor calibration system based on dynamic compensation, the variable flow dynamic compensation mode specifically includes:
dynamically adjusting and setting the opening of a micro-flow exhaust regulating valve to ensure that the change of the satellite entering pressure gauge per 10 seconds is not more than 1000Pa, and deflating the satellite in a micro-flow mode.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention adopts the scheme of 'rapid high-flow pressure charge and discharge + micro-flow gas dynamic compensation' to rapidly set and dynamically and stably control the pressure of the satellite storage tank, so that the satellite storage tank keeps a smaller pressure fluctuation range, the pressure control precision and the pressure calibration working efficiency are greatly improved, as shown in figure 3, the original method needs to be supplemented or supplemented and discharged for many times, and the dynamic compensation method only needs to carry out transient state confirmation in the dynamic compensation process;
(2) The pressure calibration system adopts the ball valve as a control valve for quick inflation and exhaust, so that the inflation and exhaust efficiency can be improved; the micro-flow regulating valve is adopted for flow control, compared with a common needle valve, the precision of control over inflation and deflation flow is greatly improved, and meanwhile, the micro-flow regulating valve is provided with vernier scales and can be set to a specific opening value; the high-precision electronic pressure gauge can be used for precisely measuring the pressure in the processes of inflation and deflation;
(3) The invention adopts the gas tank as an auxiliary control measure, and can realize the control of the gas flow changing along with the time in the link of dynamically compensating the pressure fluctuation, especially aiming at a small-volume storage tank; meanwhile, the volume of the air tank is variable, and the flow rate relative to the time change speed can be regulated and controlled;
(4) According to the invention, parameters such as the difference value between the temperature of the storage tank and the room temperature and the volume of the storage tank are introduced, and the opening of the micro-flow regulating valve can be determined by inquiring or calculating the difference value of the existing data curve, so that the pressure regulating and controlling process is more accurate and efficient.
Drawings
FIG. 1 is a schematic diagram of a pressure sensor calibration system according to the present invention;
FIG. 2 is a schematic diagram of a pressure sensor calibration system according to the present invention;
FIG. 3 is a k- Δ T plot of constant flow dynamic compensation mode for the inflation process of the present invention;
FIG. 4 is a k- Δ T curve of the quantitative gas dynamic compensation mode of the present invention during inflation;
FIG. 5 is a k- Δ T plot of constant flow dynamic compensation mode for the deflation process of the present invention;
FIG. 6 is a k- Δ T curve diagram of the quantitative gas dynamic compensation mode of the air bleeding process of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
The invention provides a pressure sensor calibration system based on dynamic compensation, which is used for accurately setting and maintaining pressure in the satellite system-level pressure sensor calibration process, and improves the accuracy and the calibration efficiency of pressure calibration.
The pressure sensor calibration system based on dynamic compensation specifically comprises an air source valve, a pressure reducing valve, a quick charging valve, a micro-flow charging regulating valve, a star meter inlet valve, a star inlet valve, a quick discharging valve, a micro-flow discharging regulating valve, a discharging stop valve, an air tank group, an air charging tank valve, a discharging tank valve, a filter 1-a filter 7, an air source pressure gauge, a pressure reducing pressure gauge and a star pressure gauge as shown in figure 1;
wherein, one end of the filter 1 is connected with an external air source; the other end of the filter 1 is connected with one end of an air source valve;
the other end of the gas source valve is divided into 2 paths, wherein 1 path is sequentially connected with a filter 5 and a gas source pressure gauge; the other 1 path is connected with one end of the pressure reducing valve;
the other end of the pressure reducing valve is divided into 4 paths; the 1 st path is sequentially connected with a filter 6 and a pressure reducing pressure gauge, the 2 nd path is connected with one end of a quick inflation valve, the 3 rd path is connected with one end of a micro-flow inflation regulating valve, and the 4 th path is connected with one end of an inflation tank valve;
the other end of the quick charging valve is divided into 3 paths, and the path 1 is sequentially connected with a filter 7, a star entering pressure gauge valve and a star entering pressure gauge; the 2 nd path is sequentially connected with the filter 3, the satellite inlet valve and an external satellite; the 3 rd path is connected with one end of a filter 4;
the other end of the micro-flow inflation regulating valve is divided into 3 paths, and the 1 st path is sequentially connected with a filter 7, a star entering pressure gauge valve and a star entering pressure gauge; the 2 nd path is sequentially connected with the filter 3, the satellite inlet valve and an external satellite; the 3 rd path is connected with one end of a filter 4;
the other end of the filter 4 is respectively connected with one end of the quick discharge valve and one end of the micro-flow exhaust regulating valve;
the other end of the quick exhaust valve is respectively connected with the other end of the micro-flow exhaust regulating valve, one end of the exhaust stop valve and one end of the exhaust tank valve; the other end of the exhaust stop valve is emptied;
the other end of the micro-flow exhaust regulating valve is respectively connected with the other end of the quick exhaust valve, one end of the exhaust stop valve and one end of the exhaust tank valve;
the other end of the exhaust tank valve is respectively connected with the other end of the inflation tank valve and one end of the filter 2;
the other end of the inflation tank valve is respectively connected with the other end of the exhaust tank valve and one end of the filter 2;
the other end of the filter 2 is connected with the gas tank group;
the meters and the valves in the system are connected through pipelines.
The valves are all manually controlled; wherein, the air source valve, the star meter inlet valve, the star valve, the exhaust stop valve, the inflation tank valve and the exhaust tank valve are needle valves; the pressure reducing valve is a high-precision pressure regulating valve with the output pressure of 0-4 MPa; the micro-flow air charging regulating valve and the micro-flow exhaust regulating valve are adjustable micro-flow regulating valves with the adjustable flow of 0-1 SLM; the quick charging valve and the quick discharging valve are ball valves; the air source pressure gauge is a common precision electronic pressure gauge of 0-25 MPa; the pressure reducing pressure gauge is a common precision electronic pressure gauge with 0-10 MPa; the star entering pressure gauge is a precise electronic pressure gauge with the resolution ratio not lower than 100 Pa; the filters 1-7 are all metal filter screen type filters with filtering precision superior to 10 um; the gas tank group comprises 3 gas tanks, the volume of each gas tank is 500mL, and the gas tanks are connected through valves and pipelines.
As shown in fig. 2, the air source, the pressure calibration control system and the satellite are connected, the heat-sensitive-temperature converter and the heat-sensitive element are connected, and the temperature of the storage tank is read through the heat-sensitive-temperature converter.
The pressure calibration process is divided into inflation process pressure calibration and deflation process pressure calibration.
The pressure calibration process control method comprises the following steps:
and (3) calibrating the pressure in the inflation process:
1) All valves are set to be in a closed state;
2) Opening a star meter inlet valve and keeping the star meter inlet valve in an open state all the time; opening a gas source valve to provide gas for a rear-end pipeline;
3) Adjusting a pressure reducing valve, setting the output inflation pressure as a required value p1+0.1MPa (an optimal value), and monitoring the pressure through a pressure reducing pressure gauge;
4) Opening the quick charging valve and the star inlet valve, and charging the satellite storage tank on the star inlet valve air path;
5) When the indication value of the star entering pressure meter reaches the required value p1, closing the quick charging valve;
6) When the volume Va > =10L (a preferred value) of the satellite storage tank, a constant flow dynamic compensation mode is adopted, namely the output pressure of the reducing valve is adjusted to be p1+0.1MPa (a preferred value), according to the difference value delta T (delta T = T1-T2) of the volume Va of the storage tank, the temperature T1 of the storage tank and the room temperature T2, a k-delta T curve is searched in the graph 3, an opening value k1 is determined, a micro-flow inflation regulating valve is set to k1, and the satellite is inflated in the micro-flow mode to compensate the pressure reduction caused by the temperature reduction of the storage tank;
7) When the volume Va of the satellite storage tank is less than 10L (a preferred value), a quantitative gas dynamic compensation mode is adopted, namely, an inflation tank valve is opened, the volume combination Vb, vb ≈ Va/100 (a preferred value) of a gas tank group is set according to the volume size Va, the difference delta T between the temperature of the storage tank and the room temperature, the inflation tank valve is opened, the gas tank group is pressurized to p2, p2 ≈ p1+0.3Mpa (a preferred value) by using a pressure reducing valve, then the pressure reducing valve is closed, a k-delta T curve is searched in fig. 4, the opening value k2 is determined, a micro-flow inflation regulating valve is set to k2, and the satellite is inflated by adopting a micro-flow mode to compensate pressure changes caused by the temperature changes of the storage tank;
8) Under the conditions of unknown volume of the storage tank, unknown temperature of the storage tank and the like, a variable flow dynamic compensation mode is adopted, namely, the output pressure of a pressure reducing valve is adjusted to be p1+0.1MPa (an optimal value), the opening of a micro-flow inflation regulating valve is dynamically adjusted and set, and a satellite is inflated in a micro-flow mode to compensate the pressure drop caused by the temperature reduction of the storage tank, so that the pressure fluctuation value of the satellite entering pressure gauge is maintained within the fluctuation range of a required value (such as +/-5000 Pa);
9) And after confirming that the pressure variation range is within the fluctuation range of the required value, carrying out pressure calibration data acquisition work, and reading the voltage value of the pressure sensor to be calibrated and the indication value of the star entering pressure meter.
And (3) calibrating the pressure in the air release process:
1) All valves are set to be in a closed state;
2) Opening a star meter inlet valve and keeping the star meter inlet valve in an open state all the time;
3) Opening an exhaust stop valve;
4) Opening an adjusting quick exhaust valve, discharging gas in the star, and closing the quick exhaust valve when the indication value of a star entering pressure meter reaches a required value p 1;
5) When the volume Va > =10L (preferred value) of the satellite storage tank, a constant flow dynamic compensation mode is adopted, namely according to the volume size Va of the storage tank, the difference value Δ T (Δ T = T1-T2) of the storage tank temperature T1 and the room temperature T2, a k- Δ T curve is searched in fig. 5, an opening value k3 is determined, a micro-flow exhaust regulating valve is opened and adjusted to k3, and the satellite is exhausted in a micro-flow mode to compensate the pressure change caused by the temperature change of the storage tank;
6) When the volume Va of the satellite storage tank is less than 10L (a preferred value), a quantitative gas dynamic compensation mode is adopted, namely, an exhaust tank valve is opened, a volume combination Vb of the gas tank group is set according to the volume size Va of the storage tank, the difference delta T between the temperature of the storage tank and the room temperature, vb is approximately equal to Va/100 (a preferred value), after gas in the gas tank group is exhausted, an exhaust stop valve is closed, a k-delta T curve is searched in figure 6, an opening value k4 is determined, a micro-flow exhaust regulating valve to k4 is adjusted and set, and the satellite is exhausted by adopting a micro-flow mode to compensate pressure change caused by temperature change of the storage tank;
7) Under the conditions of unknown volume and temperature of the storage tank, a variable flow dynamic compensation mode is adopted, namely the opening of a micro-flow exhaust regulating valve is dynamically adjusted and set, so that the change of the satellite entering pressure gauge per 10 seconds is not more than 1000Pa (optimal value), the satellite is deflated in the micro-flow mode, fine adjustment is carried out according to the method in the stabilizing process, and the pressure fluctuation value of the satellite entering pressure gauge is maintained within the range of p1 +/-5000 Pa;
8) And after confirming that the pressure variation range is within the fluctuation range, carrying out pressure calibration data acquisition work, and reading the voltage value of the pressure sensor to be calibrated and the indication value of the star entering pressure meter.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make possible variations and modifications of the present invention using the method and the technical contents disclosed above without departing from the spirit and scope of the present invention, and therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are all within the scope of the present invention.
Claims (10)
1. A pressure sensor calibration system based on dynamic compensation is characterized in that: the device comprises an air source valve, a pressure reducing valve, a quick charging valve, a micro-flow charging regulating valve, a star meter inlet valve, a star inlet valve, a quick discharge valve, a micro-flow discharging regulating valve, a discharging stop valve, an air tank set, an air charging tank valve, a discharging tank valve, a filter 1-7, an air source pressure gauge, a pressure reducing pressure gauge and a star meter inlet pressure gauge;
wherein, one end of the filter 1 is connected with an external air source; the other end of the filter 1 is connected with one end of an air source valve;
the other end of the gas source valve is divided into 2 paths, wherein 1 path is sequentially connected with a filter 5 and a gas source pressure gauge; the other 1 path is connected with one end of the pressure reducing valve;
the other end of the pressure reducing valve is divided into 4 paths; the 1 st path is sequentially connected with a filter 6 and a pressure reducing pressure gauge, the 2 nd path is connected with one end of a quick inflation valve, the 3 rd path is connected with one end of a micro-flow inflation regulating valve, and the 4 th path is connected with one end of an inflation tank valve;
the other end of the quick charging valve is divided into 3 paths, and the path 1 is sequentially connected with a filter 7, a star entering pressure gauge valve and a star entering pressure gauge; the 2 nd path is sequentially connected with the filter 3, the satellite inlet valve and an external satellite; the 3 rd path is connected with one end of a filter 4;
the other end of the micro-flow inflation regulating valve is divided into 3 paths, and the 1 st path is sequentially connected with a filter 7, a star entering pressure meter valve and a star entering pressure meter; the 2 nd path is sequentially connected with the filter 3, the satellite inlet valve and an external satellite; the 3 rd path is connected with one end of a filter 4;
the other end of the filter 4 is respectively connected with one end of the quick discharge valve and one end of the micro-flow exhaust regulating valve;
the other end of the quick exhaust valve is respectively connected with the other end of the micro-flow exhaust regulating valve, one end of the exhaust stop valve and one end of the exhaust tank valve; the other end of the exhaust stop valve is emptied;
the other end of the micro-flow exhaust regulating valve is respectively connected with the other end of the quick exhaust valve, one end of the exhaust stop valve and one end of the exhaust tank valve;
the other end of the exhaust tank valve is respectively connected with the other end of the inflation tank valve and one end of the filter 2;
the other end of the inflation tank valve is respectively connected with the other end of the exhaust tank valve and one end of the filter 2;
the other end of the filter 2 is connected with the gas tank group;
all meters and valves in the system are connected through pipelines.
2. The system for calibrating a pressure sensor based on dynamic compensation as claimed in claim 1, wherein: all valves adopt manual control valves; wherein, the air source valve, the star meter inlet valve, the star valve, the exhaust stop valve, the inflation tank valve and the exhaust tank valve are needle valves; the pressure reducing valve is a high-precision pressure regulating valve with the output pressure of 0-4 MPa; the micro-flow air charging regulating valve and the micro-flow exhaust regulating valve are adjustable micro-flow regulating valves with the adjustable flow of 0-1 SLM; the quick charging valve and the quick discharging valve are ball valves; the air source pressure gauge is a 0-25MPa common precision electronic pressure gauge; the pressure reducing pressure gauge is a common precision electronic pressure gauge of 0-10 MPa; the star entering pressure gauge is a precise electronic pressure gauge with the resolution ratio not lower than 100 Pa; the filters 1-7 are all metal filter screen type filters with filtering precision superior to 10 um; the gas tank group comprises 3 gas tanks, the volume of each gas tank is 500mL, and the gas tanks are connected through valves and pipelines.
3. The system for calibrating a pressure sensor based on dynamic compensation as claimed in claim 1, wherein: the pressure calibration process comprises the steps of pressure calibration in an inflation process and pressure calibration in a deflation process;
the specific control method for calibrating the pressure in the inflation process comprises the following steps:
all valves are set to be in a closed state;
opening a star meter inlet valve and keeping the star meter inlet valve in an open state all the time; opening a gas source valve to provide gas for a rear-end pipeline;
adjusting a pressure reducing valve, setting the output inflation pressure to be a required value p1+0.1MPa, and monitoring the pressure through a pressure reducing pressure gauge;
opening the quick charging valve and the star inlet valve, and charging the satellite storage tank on the star inlet valve air path;
when the indication value of the star entering pressure meter reaches the required value p1, closing the quick charging valve;
when the volume Va of the satellite storage tank is more than or equal to 10L, a constant flow dynamic compensation mode is adopted, and the satellite is inflated in a micro-flow mode to compensate pressure reduction caused by temperature reduction of the storage tank; when the volume Va of the satellite storage tank is less than 10L, a quantitative gas dynamic compensation mode is adopted, and the satellite is inflated in a micro-flow mode to compensate pressure change caused by temperature change of the storage tank; when the volume and the temperature of the satellite storage tank are unknown, a variable flow dynamic compensation mode is adopted, and the satellite is inflated in a micro-flow mode to compensate the pressure drop caused by the temperature reduction of the storage tank, so that the pressure fluctuation value of the satellite entering pressure gauge is maintained within the fluctuation range of the required value;
and after confirming that the pressure variation range is within the fluctuation range of the required value, carrying out pressure calibration data acquisition work, and reading the voltage value of the pressure sensor to be calibrated and the indication value of the star entering pressure meter.
4. The system for calibrating a pressure sensor based on dynamic compensation as claimed in claim 3, wherein: the constant flow dynamic compensation mode specifically comprises the following steps:
adjusting the output pressure of the pressure reducing valve to p1+0.1MPa; according to the difference value delta T between the volume size Va of the storage tank and the temperature T1 of the storage tank and the room temperature T2, delta T = T1-T2, in a constant flow dynamic compensation mode k-delta T curve in the inflation process, an opening value k1 is searched, a micro-flow inflation regulating valve is set to k1, and the satellite is inflated in a micro-flow mode to compensate pressure reduction caused by temperature reduction of the storage tank.
5. The pressure sensor calibration system based on dynamic compensation as claimed in claim 4, wherein: the quantitative gas dynamic compensation mode specifically comprises the following steps:
opening an air tank valve, and setting air tank group volume combination Vb, vb = Va/100 according to the volume size Va and the difference value delta T between the temperature of the storage tank and the room temperature; opening a valve of the inflation tank, and pressurizing the gas tank group to p2 by using a pressure reducing valve, wherein p2= p1+0.3Mpa; then closing the pressure reducing valve, and searching an opening value k2 in a k-delta T curve of a quantitative gas dynamic compensation mode in the inflation process; and (5) regulating the micro-flow inflation to k2, and inflating the satellite in a micro-flow mode to compensate pressure change caused by temperature change of the storage tank.
6. The system for calibrating a pressure sensor based on dynamic compensation as claimed in claim 5, wherein: the variable flow dynamic compensation mode specifically comprises the following steps:
adjusting the output pressure of the pressure reducing valve to p1+0.1MPa, dynamically adjusting and setting the opening of the micro-flow inflation regulating valve, and inflating the satellite in a micro-flow mode.
7. The system for calibrating a pressure sensor based on dynamic compensation as claimed in claim 3, wherein: the specific control method for calibrating the pressure in the air bleeding process comprises the following steps:
all valves are set to be in a closed state;
opening a star meter inlet valve and keeping the star meter inlet valve in an open state all the time;
opening an exhaust stop valve;
opening an adjusting quick exhaust valve, discharging gas in the star, and closing the quick exhaust valve when the indication value of a star entering pressure meter reaches a required value p 1;
when the volume Va of the satellite storage tank is more than or equal to 10L, a constant flow dynamic compensation mode is adopted, and the satellite is exhausted in a micro-flow mode to compensate pressure change caused by temperature change of the storage tank; when the volume Va of the satellite storage tank is less than 10L, a quantitative gas dynamic compensation mode is adopted, and the satellite is exhausted in a micro-flow mode to compensate pressure change caused by temperature change of the storage tank; under the conditions of unknown volume and temperature of the storage tank, a variable flow dynamic compensation mode is adopted, so that the pressure fluctuation value of the star entering pressure gauge is maintained within a fluctuation range;
and after confirming that the pressure variation range is within the fluctuation range, carrying out pressure calibration data acquisition work, and reading the voltage value of the pressure sensor to be calibrated and the indication value of the star entering pressure meter.
8. The system for calibrating a pressure sensor based on dynamic compensation as claimed in claim 7, wherein: the constant flow dynamic compensation mode specifically comprises the following steps:
according to the difference value delta T between the volume size Va of the storage tank and the room temperature T2, delta T = T1-T2, in a constant flow dynamic compensation mode k-delta T curve in the deflation process, an opening value k3 is searched; and opening and adjusting the micro-flow exhaust regulating valve to k3, and exhausting the gas of the satellite in a micro-flow mode to compensate the pressure change caused by the temperature change of the storage tank.
9. The system for calibrating a pressure sensor based on dynamic compensation as claimed in claim 8, wherein: the quantitative gas dynamic compensation mode specifically comprises the following steps:
opening an exhaust tank valve, and setting a tank group volume combination Vb, vb = Va/100 according to the volume size Va of the storage tank and the difference delta T between the temperature of the storage tank and the room temperature; and after the gas in the gas tank set is exhausted, the exhaust stop valve is closed, the opening value k4 is searched in a quantitative gas dynamic compensation mode k-delta T curve in the gas discharging process, the micro-flow exhaust regulating valve is adjusted and set to k4, and the satellite is exhausted in a micro-flow mode to compensate the pressure change caused by the temperature change of the storage tank.
10. The system for calibrating a pressure sensor based on dynamic compensation of claim 9, wherein: the variable flow dynamic compensation mode specifically comprises the following steps:
dynamically adjusting and setting the opening of the micro-flow exhaust regulating valve to ensure that the change of the satellite inlet pressure gauge per 10 seconds is not more than 1000Pa, and deflating the satellite in a micro-flow mode.
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