CN110296068B - Hydraulic pump control method, hydraulic pump control device, chemical analyzer, and storage medium - Google Patents
Hydraulic pump control method, hydraulic pump control device, chemical analyzer, and storage medium Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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Abstract
The invention discloses a hydraulic pump control method, a hydraulic pump control device, a chemical analysis instrument and a storage medium, wherein the method comprises the following steps: extracting the no-load hydraulic pressure of the load end from the memory; according to the extracted no-load hydraulic pressure of the load end, determining a single-cycle speed control table of the current operation from a plurality of preset single-cycle speed control tables respectively corresponding to the no-load hydraulic pressure values of the load end; and controlling the current running speed of the hydraulic pump according to the determined single-cycle speed control table. The hydraulic pump control method, the hydraulic pump control device, the chemical analysis instrument and the storage medium can reduce the pressure fluctuation of a load end in the detection device, improve the analysis precision of the hemoglobin analyzer and avoid instability and new interference caused by dynamic compensation of the running speed of the hydraulic pump.
Description
Technical Field
The invention relates to the field of analytical instruments, in particular to a hydraulic pump control method and device, a chemical analytical instrument and a storage medium.
Background
In the hemoglobin analyzer using high pressure liquid phase, the high pressure pump 11 is used as a core element for transporting liquid, and the mobile phase (sample to be tested and reagent) is input into a detection device, namely a chromatographic column 13 for detection and analysis, wherein the reagent is input into the detection device from a liquid storage bottle 12, as can be seen in fig. 1 in particular, the source of the sample to be tested is limited in the drawing, not shown in the drawing, and fig. 1 is a part of the structural principle in the hemoglobin analyzer: structural principle of high-pressure liquid phase detection. However, the load end, i.e., the fluctuation of the hydraulic pressure in the column is relatively large, inevitably occurs due to the following reasons, which causes the noise of the chromatogram to become large, and the analysis accuracy of the hemoglobin analyzer to deteriorate.
1) Machining errors, assembly errors and motion deviations caused by abrasion in use of the high-pressure pump;
2) in the detection analysis, as the detection analysis time increases, the accumulation of impurities in the pipeline increases and the pipeline resistance also increases.
Therefore, reducing the pressure fluctuation at the load end in the detection device is an urgent technical problem to be solved.
Disclosure of Invention
In view of the above, embodiments of the present invention are intended to provide a hydraulic pump control method, a hydraulic pump control device, a chemical analyzer, and a storage medium, which can reduce the fluctuation of the pressure at the load end in the detection device and improve the analysis accuracy of the hemoglobin analyzer.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a hydraulic pump control method, where the method includes:
extracting the no-load hydraulic pressure of the load end from the memory;
according to the extracted no-load hydraulic pressure of the load end, determining a single-cycle speed control table of the current operation from a plurality of preset single-cycle speed control tables respectively corresponding to the no-load hydraulic pressure values of the load end; wherein the single-cycle speed control table is used for controlling the operating speed of the hydraulic pump to stabilize the no-load hydraulic pressure at the load end, and the single-cycle speed control table includes the operating speed of the hydraulic pump at a plurality of time points and each time point in one operating cycle;
and controlling the current running speed of the hydraulic pump according to the determined single-cycle speed control table.
In the foregoing solution, after the controlling the current operation speed of the hydraulic pump according to the determined single-cycle speed control table, the method further includes:
and at the end of the operation of the analysis process, acquiring the no-load hydraulic pressure of the load end, and storing the no-load hydraulic pressure in the memory.
In the foregoing solution, before determining the one-cycle speed control table of the current operation from a plurality of preset one-cycle speed control tables respectively corresponding to the load end no-load hydraulic pressure values according to the extracted load end no-load hydraulic pressure, the method further includes:
acquiring the hydraulic pressure of the load end in a plurality of operating periods of the hydraulic pump, and acquiring the fluctuation rule of the hydraulic pressure of the load end in the plurality of operating periods;
according to the fluctuation rule, obtaining a plurality of first single-cycle speed control curves, wherein the plurality of first single-cycle speed control curves are used for: stabilizing the hydraulic pressure of the load end in each period by controlling the running speed of the hydraulic pump;
and acquiring a plurality of single-cycle speed control tables according to the plurality of first single-cycle speed control curves.
In the foregoing solution, obtaining a plurality of first monocycle speed control curves according to the fluctuation rule includes:
acquiring a first single-period speed control curve matched with a single period according to the hydraulic pressure fluctuation condition of the single period in the fluctuation rule;
acquiring the relation between the no-load hydraulic pressure and the non-no-load hydraulic pressure of the load end according to the fluctuation rule;
and acquiring a plurality of first single-cycle speed control curves with different amplitudes according to the numerical range of the no-load hydraulic pressure of the load end in a plurality of cycles in the fluctuation rule.
In the foregoing solution, the obtaining a plurality of first monocycle speed control curves with different amplitudes according to the numerical ranges of the no-load hydraulic pressures at the load end in a plurality of cycles in the fluctuation law includes:
and dividing the acquired no-load hydraulic pressure of the load end into a plurality of intervals according to the numerical value range, wherein each interval corresponds to a first single-cycle speed control curve with a corresponding amplitude, and the amplitude of the first single-cycle speed control curve is determined according to the intermediate value of the no-load hydraulic pressure in each interval.
In the foregoing solution, the obtaining a plurality of single-cycle speed control tables according to a plurality of first single-cycle speed control curves includes:
adjusting the first single-cycle speed control curve according to the relation between the operating speed of the hydraulic pump and the output flow rate, and acquiring a plurality of second single-cycle speed control curves of which the output flow rates are in a preset range;
and acquiring the single-cycle speed control table according to the plurality of time points in the second single-cycle speed control curve and the operating speed of the hydraulic pump at each time point.
In the foregoing solution, the adjusting the first monocycle speed control curve according to the relationship between the operating speed of the hydraulic pump and the output flow rate to obtain a second monocycle speed control curve with a plurality of output flow rates within a preset range includes:
establishing a third single-cycle speed control curve by taking the running speed of the hydraulic pump as a vertical axis and taking time as a horizontal axis according to the relation between the running speed of the hydraulic pump and the output flow, wherein the stable output flow is taken as a target;
and determining the second single-period speed control curve by means of integral operation on the condition that the area of a curved trapezoid surrounded by the first single-period speed control curve and the horizontal axis and the vertical axis in unit time is equal to the area of a curved trapezoid surrounded by the third single-period speed control curve and the horizontal axis and the vertical axis in unit time.
In a second aspect, an embodiment of the present invention provides a hydraulic pump control apparatus, including an extraction module, a determination module, and a control module; wherein the content of the first and second substances,
the extraction module is used for extracting the no-load hydraulic pressure of the load end from the memory;
the determining module is used for determining a single-cycle speed control table of the current operation from a plurality of preset single-cycle speed control tables respectively corresponding to the load end no-load hydraulic pressure values according to the extracted no-load hydraulic pressure of the load end;
and the control module is used for controlling the current running speed of the hydraulic pump according to the determined single-cycle speed control table.
In a third aspect, an embodiment of the present invention provides a chemical analysis apparatus, including: a memory, a communication bus, and a processor, wherein:
the memory is used for storing a hydraulic pump control method program and collected working data of the hydraulic pump;
the communication bus is used for realizing connection communication between the memory and the processor;
the processor is configured to execute a hydraulic pump control method program stored in the memory to implement the steps of any one of the methods described above.
In a fourth aspect, embodiments of the present invention provide a computer-readable storage medium having stored thereon an executable program, which when executed by a processor implements the steps of any one of the methods described above.
The hydraulic pump control method, the hydraulic pump control device, the chemical analysis instrument and the storage medium provided by the embodiment of the invention comprise the steps of extracting the no-load hydraulic pressure of a load end from a memory; according to the extracted no-load hydraulic pressure of the load end, determining a single-cycle speed control table of the current operation from a plurality of preset single-cycle speed control tables respectively corresponding to the no-load hydraulic pressure values of the load end; controlling the current running speed of the hydraulic pump according to the determined single-cycle speed control table; therefore, according to the hydraulic pump control method, the hydraulic pump control device, the chemical analysis instrument and the storage medium, one execution is selected from a plurality of preset single-cycle speed control tables according to the no-load hydraulic pressure of the load end, the operation speed of the hydraulic pump can be adjusted according to the pressure change of the load end, the pressure of the load end is stabilized, the fluctuation of the pressure of the load end in the detection device can be reduced, the analysis precision of the hemoglobin analyzer is improved, and the instability and new interference caused by dynamic compensation of the operation speed of the hydraulic pump are avoided.
Other beneficial effects of the embodiments of the present invention will be further described in conjunction with the specific technical solutions in the detailed description.
Drawings
FIG. 1 is a schematic diagram of the structural principle of high pressure liquid phase detection;
FIG. 2 is a schematic flow chart of a hydraulic pump control method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a collection time point of a no-load hydraulic pressure at a load end in an analysis process according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a pressure fluctuation curve at the load end in an analysis process according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an output flow control curve for controlling the operating speed of a hydraulic pump based on the hydraulic pressure at the load side in an analysis process according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a third one-cycle speed control curve for controlling constant output flow rate per unit time in the analysis process according to the embodiment of the present invention;
FIG. 7 is a schematic diagram of a first one-cycle speed control curve for stabilizing the hydraulic pressure at the load side during an analysis process according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a second single-cycle speed control curve in conjunction with FIGS. 6 and 7;
FIG. 9 is a diagram illustrating a correspondence relationship between a plurality of intervals of no-load hydraulic pressure at a load end and a one-cycle speed control table in a hydraulic pump control method according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a single-cycle speed control table in the hydraulic pump control method according to the embodiment of the present invention;
FIG. 11 is a first schematic structural diagram of a hydraulic pump control apparatus according to an embodiment of the present invention;
fig. 12 is a second schematic structural diagram of a hydraulic pump control device according to an embodiment of the present invention;
FIG. 13 is a schematic view of a chemical analysis apparatus according to an embodiment of the present invention;
fig. 14 is a schematic flow chart of load end pressure control in the hemoglobin analyzer according to the embodiment of the present invention.
Detailed Description
Aiming at the technical problem of low analysis precision caused by large pressure fluctuation of a load end in a hemoglobin analyzer using a high-pressure liquid phase, the current solution is as follows: the method comprises the steps of calculating pressure differences between a preset pressure value and a plurality of hydraulic sampling values of a high-pressure constant flow pump pipeline respectively aiming at a pulse period, determining a corresponding relation between the pressure differences and sampling time, obtaining a corresponding relation between a rotating speed regulating value of a high-pressure constant flow pump motor and the sampling time by utilizing the corresponding relation between the preset pressure differences and the rotating speed of the high-pressure constant flow pump motor, and then carrying out dynamic compensation on a motion curve of the high-pressure pump (see the invention patent with publication number of CN109578258A, invention name of 'liquid phase control method and device, high-pressure constant flow pump and storage medium').
However, since the compensation is dynamically acquired and then a compensation curve of the next period is obtained through calculation, each test sample is dynamically changed during analysis, the compensation curve is not stable enough, and new interference is introduced due to the error influence of the pressure sensor. In addition, in this compensation scheme, the influence on the flow accuracy is not considered, and the flow deviation is increased by the positive feedback compensation, so that the accuracy of the flow cannot be controlled.
In view of the above problem, an embodiment of the present invention provides a hydraulic pump control method, where the method includes: extracting the no-load hydraulic pressure of the load end from the memory; according to the extracted no-load hydraulic pressure of the load end, determining a single-cycle speed control table of the current operation from a plurality of preset single-cycle speed control tables respectively corresponding to the no-load hydraulic pressure values of the load end; and controlling the current running speed of the hydraulic pump according to the determined single-cycle speed control table.
The hydraulic pump control method, the hydraulic pump control device, the chemical analysis instrument and the storage medium select one execution from a plurality of preset single-cycle speed control tables according to the no-load hydraulic pressure of the load end, can adjust the running speed of the hydraulic pump according to the pressure change of the load end, stabilize the pressure of the load end, reduce the pressure fluctuation of the load end in the detection device, improve the analysis precision of the hemoglobin analyzer and avoid instability and new interference caused by dynamic compensation of the running speed of the hydraulic pump.
The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
FIG. 2 is a schematic flow chart of a hydraulic pump control method according to an embodiment of the present invention, which can be implemented by a hydraulic pump or a chemical analyzer equipped with a hydraulic pump; as shown in fig. 2, the method includes:
step 101: extracting the no-load hydraulic pressure of the load end from the memory;
here, the loading end may be a chromatography column of a chemical analysis instrument, which is also generally called a chromatography column if the chemical analysis instrument is a hemoglobin analyzer; the chromatographic column is provided with a solid phase, also commonly referred to as packing, and the liquid of the test sample is commonly referred to as mobile phase;
the no-load hydraulic pressure here may be collected at the end of the analysis process, i.e. no reaction occurs between the solid phase and the mobile phase, and at this time, the hydraulic pressure in the chromatographic column is the lowest, which may be referred to as the no-load hydraulic pressure. Compared with the hydraulic pressure at other time in the analysis process, the no-load hydraulic pressure is more stable and easier to collect, but the hydraulic pressure at other time in the whole analysis process has certain correlation with the no-load hydraulic pressure, and the hydraulic pressure at other time can be calculated through the no-load hydraulic pressure.
Further, the idle hydraulic pressure may be an average value of the filtered hydraulic pressure of the mobile phase over a period of time, so that the value of the idle hydraulic pressure is more accurate.
In one embodiment, after the controlling the current operation speed of the hydraulic pump according to the determined one-cycle speed control table, the method further comprises:
and at the end of the operation of the analysis process, acquiring the no-load hydraulic pressure of the load end, and storing the no-load hydraulic pressure in the memory.
Besides the periodic fluctuation, the hydraulic pressure at the load end also increases gradually with the increase of the using times, namely the shape of the periodic fluctuation is consistent, but the amplitude increases gradually, and the reason is that: with the increase of the use times, the impurities accumulated on the wall of the pipeline and the solid phase gradually increase. Therefore, the influence of impurities on the hydraulic pressure at the load end can be reflected by representing more stable and measuring more accurate unloaded hydraulic pressure.
When the analysis process starts, the no-load hydraulic pressure at the load end is not known, so that the no-load hydraulic pressure at the load end in the previous analysis process can be used as a basis for controlling the hydraulic pump, and as periodic fluctuations are basically consistent in the whole analysis process, and the accumulation degree difference of impurities is also small in adjacent analysis processes, the operation of the hydraulic pump at this time is controlled based on the data at the previous time, and the no-load hydraulic pressure at the load end needs to be acquired at the end of the analysis process at this time and is provided for the next time, the acquired time point can be referred to fig. 3, and as can be seen from fig. 3, the acquired time point is a time period in which the hydraulic pressure is relatively stable and the pressure is the lowest, namely, the no-load pressure time period.
Step 102: according to the extracted no-load hydraulic pressure of the load end, determining a single-cycle speed control table of the current operation from a plurality of preset single-cycle speed control tables respectively corresponding to the no-load hydraulic pressure values of the load end;
here, the single-cycle speed control table is used to control the operation speed of the hydraulic pump to stabilize the no-load hydraulic pressure at the load side, and includes the operation speed of the hydraulic pump at a plurality of time points and at respective time points in one operation cycle.
In one embodiment, before the determining, according to the extracted no-load hydraulic pressure at the load end, a single-cycle speed control table for the current operation from a plurality of preset single-cycle speed control tables respectively corresponding to the no-load hydraulic pressure values at the load end, the method further includes:
acquiring the hydraulic pressure of the load end in a plurality of operating periods of the hydraulic pump, and acquiring the fluctuation rule of the hydraulic pressure of the load end in the plurality of operating periods;
according to the fluctuation rule, obtaining a plurality of first single-cycle speed control curves, wherein the plurality of first single-cycle speed control curves are used for: stabilizing the hydraulic pressure of the load end in each period by controlling the running speed of the hydraulic pump;
and acquiring a plurality of single-cycle speed control tables according to the plurality of first single-cycle speed control curves.
Since the no-load hydraulic pressure at the load side is directly related to the operating speed of the hydraulic pump, the no-load hydraulic pressure at the load side can be stabilized by controlling the operating speed of the hydraulic pump; specifically, the stabilization requirement of the unloaded hydraulic pressure at the load end may be: is stable between 3-10 MPa. In order to better stabilize the no-load hydraulic pressure at the load end by controlling the operation speed of the hydraulic pump, it is necessary to first acquire the hydraulic pressure at the load end in a plurality of periods of the operation of the hydraulic pump, and obtain a fluctuation law of the hydraulic pressure at the load end in the plurality of periods, which also includes a fluctuation law of the no-load hydraulic pressure at the load end in the plurality of periods, where the fluctuation law is mainly a periodic fluctuation caused by the flow of the hydraulic pump such as liquid suction, liquid discharge, and the like, and specifically, refer to fig. 4. The step of acquiring the hydraulic pressure at the load end in a plurality of operating cycles of the hydraulic pump means that a large amount of data needs to be continuously acquired over a plurality of operating cycles, even in the whole life cycle of the chemical analysis instrument, and the accurate single-cycle speed control table can be acquired only by continuously acquiring a large amount of data.
In addition, besides the periodic fluctuation, the fluctuation rule of the no-load hydraulic pressure of the load end is in gradually increasing relation with impurities on the pipeline wall and the solid phase, so that the no-load hydraulic pressure of the load end slightly increases after each period.
In one embodiment, the obtaining a plurality of first monocycle speed control curves according to the fluctuation law includes:
acquiring a first single-period speed control curve matched with a single period according to the hydraulic pressure fluctuation condition of the single period in the fluctuation rule;
acquiring the relation between the no-load hydraulic pressure and the non-no-load hydraulic pressure of the load end according to the fluctuation rule;
and acquiring a plurality of first single-cycle speed control curves with different amplitudes according to the numerical range of the no-load hydraulic pressure of the load end in a plurality of cycles in the fluctuation rule.
After acquiring fluctuation rules in multiple cycles, a pressure fluctuation curve of the hydraulic pump in a single cycle can be obtained, and since the hydraulic pressure at the load end and the operation speed of the hydraulic pump have a direct relationship, since the hydraulic pressure at the load end can be stabilized by adjusting the operation speed of the hydraulic pump, a first one-cycle speed control curve of the hydraulic pump can be formulated according to the pressure fluctuation curve in a single cycle of the hydraulic pump, specifically, the waveform of the first one-cycle speed control curve is basically opposite to the waveform of the pressure fluctuation curve, that is, the amplitudes of two waveforms are symmetric to the horizontal axis, that is, the trough of the first one-cycle speed control curve corresponds to the crest of the pressure fluctuation curve, and the crest of the first one-cycle speed control curve corresponds to the trough of the pressure fluctuation curve.
After fluctuation rules in a plurality of periods are collected, the relation between the hydraulic pressure of the load end in no-load and the hydraulic pressure of the load end in non-no-load can be obtained;
therefore, the no-load hydraulic pressure of the load end can reflect the hydraulic pressure when the load end is not in no-load state, and can also reflect the accumulation degree of impurities on the wall and the solid phase of the pipeline. Therefore, according to the extracted no-load hydraulic pressure at the load end, the running speed of the hydraulic pump can be determined, so that the hydraulic pressure at the load end is stabilized, and the influence of impurity accumulation on the pipeline wall and the solid phase on the analysis process is reduced. That is, according to the extracted no-load hydraulic pressure at the load end, the single-cycle speed control table of the current operation can be determined from a plurality of preset single-cycle speed control tables respectively corresponding to the no-load hydraulic pressure values at the load end.
In one embodiment, the obtaining a plurality of first monocycle speed control curves with different amplitudes according to the numerical ranges of the unloaded hydraulic pressure at the load end in a plurality of cycles in the fluctuation law includes:
and dividing the acquired no-load hydraulic pressure of the load end into a plurality of intervals according to the numerical value range, wherein each interval corresponds to a first single-cycle speed control curve with a corresponding amplitude, and the amplitude of the first single-cycle speed control curve is determined according to the intermediate value of the no-load hydraulic pressure in each interval.
As the number of times of use increases, the impurities accumulated on the wall and the solid phase of the pipeline gradually increase, that is, the no-load hydraulic pressure at the load end also gradually increases, and the numerical distribution range of the no-load hydraulic pressure at the load end is relatively large in the whole life cycle of the chemical analysis instrument, the no-load hydraulic pressure at the load end needs to be divided into a plurality of intervals, each interval corresponds to a first single-cycle speed control curve, and therefore a plurality of first single-cycle speed control curves with different amplitudes are needed. Wherein the amplitude of each first monocycle speed control curve is determined according to the intermediate value of the unloaded hydraulic pressure in each interval. Thus, it is possible to stabilize the hydraulic pressure at the load side and also to reduce the control workload.
In addition, the fluctuation rule of the hydraulic pressure of the load end in a plurality of periods can be obtained through a simulation load, the simulation load can simulate the hydraulic characteristic in the chromatographic column and can also simulate the characteristic of resistance increase after impurities on the pipeline wall and the solid phase of the chromatographic column are accumulated, so that the hydraulic pressure of the load end in a plurality of periods when the hydraulic pump operates is not required to be collected, and the workload of data collection is reduced.
In one embodiment, said obtaining a plurality of said one-cycle speed control tables from a plurality of said first one-cycle speed control curves comprises:
adjusting the first single-cycle speed control curve according to the relation between the operating speed of the hydraulic pump and the output flow rate, and acquiring a plurality of second single-cycle speed control curves of which the output flow rates are in a preset range;
and acquiring the single-cycle speed control table according to the plurality of time points in the second single-cycle speed control curve and the operating speed of the hydraulic pump at each time point.
Here, the output flow rate is set in a preset range according to the precision of an analysis process, and is generally 0.5-2.5 ml/min; for convenience of description, this preset range is assumed to be an ideal constant value, which may be, for example, 1.5 ml/min.
Since the hydraulic pressure at the load end also affects the output flow rate of the hydraulic pump, and the output flow rate of the hydraulic pump also affects the accuracy of the analysis process, it is necessary to control the output flow rate of the hydraulic pump by controlling the hydraulic pressure at the load end, but the control of the hydraulic pressure at the load end is related to the operation speed of the hydraulic pump, so that an output flow control diagram can be established with the hydraulic pressure at the load end as a horizontal axis and the operation speed of the hydraulic pump as a vertical axis, as shown in fig. 5, fig. 5 only shows that the control of the output flow rate is related to the hydraulic pressure at the load end (P1\ P2\ P3) and the operation speed of the hydraulic pump (V1\ V2\ V3), and does not show an actual output flow control diagram.
Namely, a plurality of second single-cycle speed control curves with output flow rates within a preset range are obtained by adjusting the running speed of the hydraulic pump and simultaneously controlling the output flow rate of the hydraulic pump and the hydraulic pressure at the load end, namely, adjusting the first single-cycle speed control curve.
In one embodiment, the adjusting the first single-cycle speed control curve according to the relationship between the operating speed of the hydraulic pump and the output flow rate to obtain a plurality of second single-cycle speed control curves with the output flow rates within a preset range includes:
establishing a third single-cycle speed control curve by taking the running speed of the hydraulic pump as a vertical axis and taking time as a horizontal axis according to the relation between the running speed of the hydraulic pump and the output flow, wherein the stable output flow is taken as a target;
and determining the second single-period speed control curve by means of integral operation on the condition that the area of a curved trapezoid surrounded by the first single-period speed control curve and the horizontal axis and the vertical axis in unit time is equal to the area of a curved trapezoid surrounded by the third single-period speed control curve and the horizontal axis and the vertical axis in unit time.
In the embodiment of the present invention, in order to ensure the accuracy of the analysis process, it is necessary to control the output flow rate in the unit time period to be constant, and at each time point in the unit time, the output flow rate may fluctuate up and down, fig. 6 is a third single-cycle speed control curve for controlling the output flow rate to be constant, t is a unit time, V is the operation speed of the hydraulic pump, and fig. 6 is an ideal state, and not only the output flow rate in the unit time is constant, but also the operation speed of the hydraulic pump is constant, and in practice, the operation speed of the hydraulic pump may change.
The hydraulic pressure at the load end is different, the pressure fluctuation amplitude at each time point in unit time needs to be controlled to be not too large, but the accumulated fluctuation amplitude in unit time is not required, fig. 7 is a first single-cycle speed control curve for controlling the hydraulic pressure at the load end, t is unit time, V is the operating speed of the hydraulic pump, and the first single-cycle speed control curve in fig. 7 is only an example and is not an actual first single-cycle speed control curve;
therefore, it is possible to combine the control requirements of the output flow and the hydraulic pressure at the load end to obtain a second single-cycle speed control curve, specifically referring to fig. 8, where fig. 8 is a combination of the hydraulic pump operation speed control curves of fig. 6 and 7, where a thick line is a third single-cycle speed control curve for controlling the output flow and a thin line is a first single-cycle speed control curve for stabilizing the hydraulic pressure at the load end; the output flow rate in the unit time period is controlled to be constant, that is, the constant integral of the third single-cycle speed control curve shown in fig. 6 in the unit time is a constant value, that is, the area of the curved trapezoid surrounded by the curve and the horizontal axis and the vertical axis is constant, in this embodiment, the curved trapezoid shown in fig. 6 is a rectangle, and if the shape of the hydraulic pump operation speed curve shown in fig. 7 is slightly adjusted on the premise of keeping the approximate shape, the constant integral of the first single-cycle speed control curve shown in fig. 7 in the unit time, that is, the area of the curved trapezoid surrounded by the curve and the horizontal axis and the vertical axis is equal to the area of the rectangle in fig. 6, the output flow rate can be ensured to be constant, and the hydraulic pressure at the load end can also be stabilized, in this embodiment, the curved trapezoid shown in fig. 7 is an irregular.
Specifically, the two curves form three relatively closed regions, namely, a region where a section line is drawn in the figure, and the areas of the three closed regions need to conform to the expression (1):
S3＝S1+S2(1)
s3, S2 and S1 are the areas of three closed areas, the calculation of the areas of the three closed areas can use integral operation, corresponding calculation formulas are established according to the integral operation, the operation speed control curve of the hydraulic pump with constant output flow is assumed to be known, then the operation speed control curve of the hydraulic pump with unknown stable load end hydraulic pressure is calculated, namely a second single-cycle speed control curve is calculated, and a more accurate second single-cycle speed control curve can be obtained through the integral operation mode; fig. 8 is an example only and is not an actual second single-cycle speed control curve. There are a plurality of first one-cycle speed control curves, and thus a plurality of second one-cycle speed control curves.
Then, according to the second single-cycle speed control curve, obtaining a single-cycle speed control table, specifically, obtaining the single-cycle speed control table, that is, discretizing the second single-cycle speed control curve so as to control a control component in a hydraulic pump or a chemical analysis instrument, where the control component may be a Micro Control Unit (MCU) or an MCU + Field Programmable Gate Array (FPGA); other schemes for controlling the operation speed of the hydraulic pump are possible, and are not particularly limited.
Since there are a plurality of the second one-cycle speed control curves, there are a plurality of the one-cycle speed control tables, which facilitates selection according to the no-load hydraulic pressures of different load ends.
Specifically, the no-load hydraulic pressure at the load end is divided into a plurality of intervals, each interval corresponds to a first one-cycle speed control curve, and after the requirement of output flow control is added, each interval corresponds to a one-cycle speed control table, specifically as shown in fig. 9, for example, the pressure between P0 and P1 belongs to interval 1.
It should be noted that, when analyzing test samples of different compositions, the hydraulic pressure at the load end is different even if other conditions are the same, and therefore, the single-cycle speed control tables are respectively prepared for different test samples, that is, one type of test sample has one series of single-cycle speed control tables, and there are n series of single-cycle speed control tables for n types of test samples.
Step 103: and controlling the current running speed of the hydraulic pump according to the determined single-cycle speed control table.
Here, the single-cycle speed control table includes the operating speed of the hydraulic pump at a plurality of time points and at respective time points in one operating cycle. And controlling the operation of the hydraulic pump according to the operation speed corresponding to each time point in time sequence, so that the output flow rate of the hydraulic pump in unit time can be ensured to be kept in a preset range, and the fluctuation range of the hydraulic pressure of the load end in unit time is ensured not to be too large.
The single-cycle speed control table is selected according to the no-load hydraulic pressure of the load end, namely the no-load hydraulic pressure of the load end is in which pressure interval, the single-cycle speed control table corresponding to the pressure interval is selected, and once the extracted no-load hydraulic pressure of the load end is determined, the single-cycle speed control table is also determined, and in the whole analysis process, the running speed of the hydraulic pump is determined at each time point, so that the control of the running speed of the hydraulic pump is stable, dynamic collection through a pressure sensor is not needed, and new interference is avoided.
The single-cycle speed control table can be seen in fig. 10, as shown in fig. 10, each step in the table, i.e. each step, has a corresponding hydraulic pump operation speed V, for example, V1 corresponds to step1, V2 corresponds to step2 … … Vn corresponds to step n;
specifically, the step may be one pulse, and in the embodiment of the present invention, each operation cycle of the hydraulic pump may include 6000 pulses, each having a corresponding speed value, so that the control is more precise.
Example two
Fig. 11 is a schematic structural diagram of a hydraulic pump control apparatus according to an embodiment of the present invention, and as shown in fig. 11, the hydraulic pump control apparatus 200 includes an extraction module 201, a determination module 202, and a control module 203; wherein the content of the first and second substances,
the extraction module 201 is used for extracting the no-load hydraulic pressure of the load end from the memory;
the determining module 202 is configured to determine, according to the extracted no-load hydraulic pressure at the load end, a single-cycle speed control table of the current operation from a plurality of preset single-cycle speed control tables respectively corresponding to the no-load hydraulic pressure values at the load end;
the control module 203 is configured to control the current operating speed of the hydraulic pump according to the determined single-cycle speed control table.
In one embodiment, as shown in fig. 12, the hydraulic pump control apparatus 200 further includes a first acquisition module 204 and a second acquisition module 205, the first acquisition module 204 being configured to:
and after controlling the current running speed of the hydraulic pump according to the determined single-cycle speed control table, acquiring the no-load hydraulic pressure of the load end at the tail section of the operation of the analysis flow, and storing the no-load hydraulic pressure in the memory.
The second obtaining module 205 is configured to:
before the single-cycle speed control table of the current operation is determined from a plurality of preset single-cycle speed control tables respectively corresponding to the load end no-load hydraulic pressure values according to the extracted no-load hydraulic pressure of the load end,
acquiring the hydraulic pressure of the load end in a plurality of operating periods of the hydraulic pump, and acquiring the fluctuation rule of the hydraulic pressure of the load end in the plurality of operating periods;
acquiring a plurality of first single-cycle speed control curves according to the fluctuation rule;
and acquiring a plurality of single-cycle speed control tables according to the plurality of first single-cycle speed control curves.
In one embodiment, the second obtaining module 205 is further configured to:
acquiring a first single-period speed control curve matched with a single period according to the hydraulic pressure fluctuation condition of the single period in the fluctuation rule;
acquiring the relation between the no-load hydraulic pressure and the non-no-load hydraulic pressure of the load end according to the fluctuation rule;
acquiring a plurality of first single-cycle speed control curves with different amplitudes according to the numerical range of the no-load hydraulic pressure intensity of the load end in a plurality of cycles in the fluctuation rule;
and dividing the acquired no-load hydraulic pressure of the load end into a plurality of intervals according to the numerical value range, wherein each interval corresponds to a first single-cycle speed control curve with a corresponding amplitude, and the amplitude of the first single-cycle speed control curve is determined according to the intermediate value of the no-load hydraulic pressure in each interval.
In one embodiment, the second obtaining module 205 is further configured to:
adjusting the first single-cycle speed control curve according to the relation between the operating speed of the hydraulic pump and the output flow rate, and acquiring a plurality of second single-cycle speed control curves of which the output flow rates are in a preset range;
and acquiring the single-cycle speed control table according to the plurality of time points in the second single-cycle speed control curve and the operating speed of the hydraulic pump at each time point.
In one embodiment, the second obtaining module 205 is further configured to:
establishing a third single-cycle speed control curve by taking the running speed of the hydraulic pump as a vertical axis and taking time as a horizontal axis according to the relation between the running speed of the hydraulic pump and the output flow, wherein the stable output flow is taken as a target;
and determining the second single-period speed control curve by means of integral operation on the condition that the area of a curved trapezoid surrounded by the first single-period speed control curve and the horizontal axis and the vertical axis in unit time is equal to the area of a curved trapezoid surrounded by the third single-period speed control curve and the horizontal axis and the vertical axis in unit time.
The hydraulic pump control device 200 according to the embodiment of the present invention may be a device provided in the chemical analyzer, or may be a separate device connected to and communicating with the chemical analyzer.
In some embodiments, the hydraulic pump control apparatus 200 according to the embodiment of the present invention may be configured to execute the hydraulic pump control method described in the above embodiments, and may also include a module configured to execute any procedure and/or step in the hydraulic pump control method described in the above embodiments, which is not described again for brevity.
The above description of the apparatus embodiments, similar to the above description of the method embodiments, has similar beneficial effects as the method embodiments. For technical details not disclosed in the embodiments of the apparatus according to the invention, reference is made to the description of the embodiments of the method according to the invention for understanding.
Each module included in the embodiment of the invention can be realized by a processor in a chemical analysis instrument; of course, the method can also be realized by a logic circuit in the chemical analysis instrument; in implementation, the processor may be a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like.
EXAMPLE III
As shown in fig. 13, an embodiment of the present invention further provides a chemical analysis apparatus 300, where the chemical analysis apparatus 300 includes: memory 301, communication bus 302, and processor 303, wherein:
the memory 301 is configured to store a hydraulic pump control method program and collected working data of the hydraulic pump;
the communication bus 302 is used for realizing connection communication between the memory and the processor;
the processor 303 is configured to execute a hydraulic pump control method program stored in the memory to implement the steps of the method according to the first embodiment.
Specifically, the processor 303 may be a Reduced Instruction Set Computer (RISC) architecture based multi-core processor; the memory 301 may be a high capacity magnetic memory.
Specifically, the chemical analysis instrument 300 further includes: chromatography column 304, hydraulic pump 305, detector 306, pressure sensor 307 and external communication interface 308, wherein:
the chromatographic column 304 is used for separating substances of a mobile phase;
the hydraulic pump 305 for delivering a test sample of liquid, i.e. mobile phase; specifically, the hydraulic pump is a high-pressure constant flow pump, more specifically, a reciprocating double-plunger parallel pump controlled by a microcomputer, and the working principle of the hydraulic pump is as follows: the motor is used for driving the cam shaft to rotate, the cam shaft is used for driving the plunger rod to linearly move, and pressure is applied to a mobile phase flowing through the cavity of the hydraulic pump, so that the control of the hydraulic pressure intensity of the load end is substantially the control of the rotating speed of the motor of the hydraulic pump;
the detector 306 is used for detecting the substances separated by the chromatographic column 304;
the pressure sensor 307 is used for detecting the hydraulic pressure in the pipeline of the chromatographic column 304;
the external communication interface 308 may be used to communicate with an external terminal, the external terminal includes a server or a client, and the external communication interface 308 may include a wired interface and a wireless interface.
The above description of the chemical analysis apparatus embodiment is similar to that of the above method embodiment, with similar advantageous effects to those of the method embodiment. For technical details not disclosed in the chemical analysis apparatus of the present embodiment, please refer to the description of the method embodiment of the present invention for understanding.
Example four
Embodiments of the present invention further provide a computer-readable storage medium, on which an executable program is stored, and the executable program, when executed by a processor, implements the steps of the hydraulic pump control method according to the first embodiment.
The computer readable storage medium may be a high capacity magnetic memory.
The above description of the computer-readable storage medium embodiments is similar to the description of the method embodiments described above, with similar beneficial effects as the method embodiments. For technical details not disclosed in the computer-readable storage medium of the present embodiment, please refer to the description of the method embodiment of the present invention for understanding.
EXAMPLE five
Fig. 14 is a schematic flow chart of the load end pressure control in the hemoglobin analyzer according to the embodiment of the present invention, and as shown in fig. 14, the flow chart includes:
step 501: and acquiring the no-load hydraulic pressure of the load end. The no-load hydraulic pressure of the load end is extracted from the memory, which is acquired in the last analysis process;
step 502: and judging whether the no-load hydraulic pressure of the load end spans the pressure interval. The pressure intervals are formed by grouping according to the pressure, and each interval corresponds to a single-cycle speed control table, which is called a speed control table for short; if crossing, go to step 503, otherwise go to step 504;
step 503: the current speed control table is replaced with the new speed control table. The speed control table, namely the single-cycle speed control table, is determined on the basis of collecting a large number of pressure intensities of a load end in the hemoglobin analyzer, can stabilize the hydraulic pressure intensity of the load end in a cycle, control the fluctuation amplitude of the hydraulic pressure intensity and ensure the analysis precision of the hemoglobin analyzer;
step 504: the velocity value of each pulse is loaded into a register. Thus, the control is faster;
step 505: and controlling the operation of the hydraulic pump according to the speed value of each pulse in the register. In this embodiment, the hydraulic pump includes 6000 pulses per operating cycle, each pulse configured with a speed value, and therefore needs to be loaded into a register in advance in order to be controlled more quickly. And controlling the operation of a hydraulic pump in the hemoglobin analyzer according to the speed value of each pulse in the register, so that the hydraulic pressure at the load end in the hemoglobin analyzer can be better controlled, and the fluctuation of the hydraulic pressure is relatively stable.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. A hydraulic pump control method, characterized by comprising:
extracting the no-load hydraulic pressure of the load end from the memory;
according to the extracted no-load hydraulic pressure of the load end, determining a single-cycle speed control table of the current operation from a plurality of preset single-cycle speed control tables respectively corresponding to the no-load hydraulic pressure values of the load end; wherein the single-cycle speed control table is used for controlling the operating speed of the hydraulic pump to stabilize the no-load hydraulic pressure at the load end, and the single-cycle speed control table includes the operating speed of the hydraulic pump at a plurality of time points and each time point in one operating cycle;
and controlling the current running speed of the hydraulic pump according to the determined single-cycle speed control table.
2. The method as claimed in claim 1, wherein after said controlling the current operation speed of the hydraulic pump according to the determined one-cycle speed control table, the method further comprises:
and at the end of the operation of the analysis process, acquiring the no-load hydraulic pressure of the load end, and storing the no-load hydraulic pressure in the memory.
3. The method according to claim 1 or 2, wherein before determining the one-cycle speed control table of the current operation from a plurality of preset one-cycle speed control tables respectively corresponding to the load end no-load hydraulic pressure values according to the extracted no-load hydraulic pressure at the load end, the method further comprises:
acquiring the hydraulic pressure of the load end in a plurality of operating periods of the hydraulic pump, and acquiring the fluctuation rule of the hydraulic pressure of the load end in the plurality of operating periods;
according to the fluctuation rule, obtaining a plurality of first single-cycle speed control curves, wherein the plurality of first single-cycle speed control curves are used for: stabilizing the hydraulic pressure of the load end in each period by controlling the running speed of the hydraulic pump;
and acquiring a plurality of single-cycle speed control tables according to the plurality of first single-cycle speed control curves.
4. The method of claim 3, wherein said obtaining a plurality of first monocycle speed control curves according to said fluctuation law comprises:
acquiring a first single-period speed control curve matched with a single period according to the hydraulic pressure fluctuation condition of the single period in the fluctuation rule;
acquiring the relation between the no-load hydraulic pressure and the non-no-load hydraulic pressure of the load end according to the fluctuation rule;
and acquiring a plurality of first single-cycle speed control curves with different amplitudes according to the numerical range of the no-load hydraulic pressure of the load end in a plurality of cycles in the fluctuation rule.
5. The method of claim 4, wherein obtaining a plurality of first single-cycle speed control curves of different magnitudes based on a range of values of the unloaded hydraulic pressure at the load end over a plurality of cycles in the fluctuation law comprises:
and dividing the acquired no-load hydraulic pressure of the load end into a plurality of intervals according to the numerical value range, wherein each interval corresponds to a first single-cycle speed control curve with a corresponding amplitude, and the amplitude of the first single-cycle speed control curve is determined according to the intermediate value of the no-load hydraulic pressure in each interval.
6. The method of claim 3, wherein said obtaining a plurality of said one-cycle speed control tables from a plurality of said first one-cycle speed control curves comprises:
adjusting the first single-cycle speed control curve according to the relation between the operating speed of the hydraulic pump and the output flow rate, and acquiring a plurality of second single-cycle speed control curves of which the output flow rates are in a preset range;
and acquiring the single-cycle speed control table according to the plurality of time points in the second single-cycle speed control curve and the operating speed of the hydraulic pump at each time point.
7. The method of claim 6, wherein the adjusting the first single-cycle speed control profile according to the relationship between the operating speed of the hydraulic pump and the output flow rate to obtain a plurality of second single-cycle speed control profiles with the output flow rate within a preset range comprises:
establishing a third single-cycle speed control curve by taking the running speed of the hydraulic pump as a vertical axis and taking time as a horizontal axis according to the relation between the running speed of the hydraulic pump and the output flow, wherein the stable output flow is taken as a target;
and determining the second single-period speed control curve by means of integral operation on the condition that the area of a curved trapezoid surrounded by the first single-period speed control curve and the horizontal axis and the vertical axis in unit time is equal to the area of a curved trapezoid surrounded by the third single-period speed control curve and the horizontal axis and the vertical axis in unit time.
8. The hydraulic pump control device is characterized by comprising an extraction module, a determination module and a control module; wherein the content of the first and second substances,
the extraction module is used for extracting the no-load hydraulic pressure of the load end from the memory;
the determining module is used for determining a single-cycle speed control table of the current operation from a plurality of preset single-cycle speed control tables respectively corresponding to the load end no-load hydraulic pressure values according to the extracted no-load hydraulic pressure of the load end;
and the control module is used for controlling the current running speed of the hydraulic pump according to the determined single-cycle speed control table.
9. A chemical analysis apparatus, comprising: a memory, a communication bus, and a processor, wherein:
the memory is used for storing a hydraulic pump control method program and collected working data of the hydraulic pump;
the communication bus is used for realizing connection communication between the memory and the processor;
the processor for executing a hydraulic pump control method program stored in a memory to carry out the steps of the method according to any one of claims 1 to 7.
10. A computer-readable storage medium, having stored thereon an executable program which, when executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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| JPS572487A (en) * | 1980-06-06 | 1982-01-07 | Yaskawa Electric Mfg Co Ltd | Automatic shift operating procedure for pump |
| CN103590993A (en) * | 2013-11-06 | 2014-02-19 | 安徽皖仪科技股份有限公司 | Method for reducing flow fluctuations in liquid chromatograph and infusion pump device |
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| JPS572487A (en) * | 1980-06-06 | 1982-01-07 | Yaskawa Electric Mfg Co Ltd | Automatic shift operating procedure for pump |
| CN103590993A (en) * | 2013-11-06 | 2014-02-19 | 安徽皖仪科技股份有限公司 | Method for reducing flow fluctuations in liquid chromatograph and infusion pump device |
| CN107664669A (en) * | 2016-07-27 | 2018-02-06 | 北京普源精电科技有限公司 | Ultra Performance Liquid Chromatography instrument transfusion system control method and device |
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