CN101435715A - Air-flow meter calibration method based on software analysis technology - Google Patents
Air-flow meter calibration method based on software analysis technology Download PDFInfo
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- CN101435715A CN101435715A CNA2008102117423A CN200810211742A CN101435715A CN 101435715 A CN101435715 A CN 101435715A CN A2008102117423 A CNA2008102117423 A CN A2008102117423A CN 200810211742 A CN200810211742 A CN 200810211742A CN 101435715 A CN101435715 A CN 101435715A
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Abstract
The invention relates to a method for calibrating an air flow meter based on software analysis technology. A straight pipeline 1 is provided with a standard faucet 2 and a plurality of faucets 3 to be calibrated, one end of the straight pipeline 1 is provided with a negative pressure airflow generating device 4, and the other end of the straight pipeline 1 is provided with an air filter 5 for preventing a test pipeline and the tested product from being polluted by impurities in air. Air flow generated by the device 4 is controlled through a flow control device 6 and used for achieving calibration and test of the flow meter under different flows. The method comprises the following steps: adopting a multi-channel data acquisition system to synchronously acquire output data of the flow meter on the standard faucet 2 and the faucet 3 to be calibrated during calibration, then using a software analysis system to convert the data on the two faucets into data corresponding to the data at the same time on one faucet, and excluding errors caused by the factors such as pipelines, structures, airflow forms, and the like. The method reduces requirement of a calibration system for hardware configuration such as the pipeline, air source, fluid control and the like, lowers calibration cost, improves calibration efficiency, and is suitable for calibration work for batch production of the air flow meters.
Description
Technical field
The present invention relates to a kind of scaling method that is applicable to that motor car engine is produced in batches with air flowmeter, be meant a kind of comparison formula air-flow meter calibration method especially based on software analysis technology, utilize software analysis technology, reduce the requirement of proving installation pipeline, source of the gas, fluid control device etc.
Background technology
Air flow meter is as the survey sensor of car engine air admittance amount, and its measuring accuracy directly affects the economic index of motor car engine performance, the standard of motor vehicle exhaust emission etc.In the production run of air flow meter, must demarcate by platform.
General, the demarcation of flowmeter needs to implement on the flow standard device.But, can't on general flow standard device, carry out because pipeline is excessive for the motor car engine air flow meter.And, on-the-spot real fail to be sold at auction fixed or utilize wind-tunnel etc. even can adopt by certain means, its cost does not conform to the requirement of producing flowmeter in batches yet.
At present, some air flow meter producers adopt simple machine to demarcate.Described simple machine usually adopts a T type pipeline, places a proving flowmeter and a flowmeter to be calibrated respectively in the same position of two pipelines of its symmetry, and places gas generating unit and fluid control valve at the 3rd end of T type pipe.Adopt such device, if obtain accurate measurement result, the layout that just requires T type pipe and last all devices thereof all is strict symmetrical.But as a rule, so strict symmetry is difficult to reach, thus will inevitably bring into owing to all multifactor errors that causes such as pipeline, source of the gas, fluid controls, and the repeatedly test of same flowmeter is also lacked repeatability.
Summary of the invention
The object of the present invention is to provide a kind of comparison formula air flow meter scaling method, described scaling method can reduce the requirement of calibration system to hardware configuration such as pipeline, source of the gas, fluid controls by the dirigibility of software analysis technology.
The invention is characterized in and adopt a straight pipeline, dispose a reference flowmeter socket and a plurality of flowmeter socket to be calibrated on it as required.One end of pipeline is furnished with gas generating unit and fluid control device, and the other end is furnished with air cleaner.The output signal of proving flowmeter and flowmeter to be measured sends the software analysis system to after by outside multi-path data acquiring system synchronous acquisition.The software analysis system is by judging the margin of error that causes owing to various factors between the diverse location on the pipeline and recompensing to the analysis of data.
Gas generating unit involved in the present invention and fluid control device do not need too high accuracy requirement, only need demarcate in that two or more proving flowmeters are treated proving flowmeter on the basis that the output signal on the diverse location compares.Like this, what unique requirement guaranteed precision is exactly two or more products as proving flowmeter, and the error that each side such as gas generating unit, fluid control device, pipeline configuration are brought into then can be isolated away by the software analysis means.
Description of drawings
Fig. 1 is the test system hardware schematic representation of apparatus that the present invention relates to.
Fig. 2 is the software analysis process flow diagram that the present invention relates to.
Embodiment
With reference to the accompanying drawings the specific embodiment of the present invention is described.
As shown in Figure 1, the test system hardware device that relates to of the embodiment of the invention comprises a straight pipeline 1.Described straight pipeline 1 is provided with a reference flowmeter socket 2 and a plurality of flowmeter socket 3 to be calibrated.According to the demand of production lot, the flowmeter socket 3 to be calibrated that can be provided with on straight pipeline 1 is as much as possible demarcated efficient to improve product.End at described straight pipeline 1 is provided with air flow-producing device 4 in order to produce gas flow, and the other end is provided with air cleaner 5 to prevent that testing conduit from promptly being demarcated product and being polluted by dust in air.The gas flow that described air flow-producing device 4 is produced is controlled size by volume control device 6, thereby can realize the rating test of flowmeter under different flow.
As shown in Figure 2, the software analysis flow process that relates to of the embodiment of the invention comprises two big steps.First step is the proving flowmeter 7 of packing into No. 1, the proving flowmeter 8 of packing into No. 2 on flowmeter socket 3 to be calibrated on reference flowmeter socket 2.After the energising, the output data of described two proving flowmeters 7 and 8 under the different flow effect is by outside multi-path data acquiring system 9 synchronous acquisition.The data of being gathered are through forming canonical function relational expression 10 behind the compare of analysis of software systems.Described canonical function relational expression 10 is to be output as dependent variable with No. 1 proving flowmeter 7, and No. 2 proving flowmeter 8 is output as dependent variable, sets up one-to-one relationship between the two by the interpolation means.Like this, corresponding No. 1 proving flowmeter 7 is in proving flowmeter socket 2 locational any one output valve, and No. 2 proving flowmeters 8 that can find a unique correspondence are in flowmeter socket 3 locational output valves to be calibrated.
Second step of demarcating is the flowmeter 11 to be calibrated of packing on flowmeter socket 3 to be calibrated.After the energising, No. 1 proving flowmeter 7 and the output of flowmeter to be calibrated 11 under the different flow effect are equally by outside multi-path data acquiring system 9 synchronous acquisition.The data of being gathered are on the basis of reference standard functional relation 10, through forming calibration function relational expression 12 behind the compare of analysis of software systems.Described calibration function relational expression 12 to set up process as follows: at first, reference standard functional relation 10 find out No. 1 proving flowmeter 7 at pairing No. 2 proving flowmeters 8 of proving flowmeter socket 2 locational outputs in flowmeter socket 3 locational outputs to be calibrated, be the resulting data of synchronous acquisition on the flowmeter socket 3 to be calibrated thereby become No. 2 proving flowmeters 8 to be inserted in same socket the data conversion of being gathered with flowmeter 11 to be calibrated.Then, in the flowmeter socket 3 locational dependent variables that are output as to be calibrated, flowmeter 11 to be calibrated is in the flowmeter socket 3 locational dependent variables that are output as to be calibrated with No. 2 proving flowmeters 8, sets up one-to-one relationship between the two by the interpolation means.
Handle the relation between the output of the output of No. 2 proving flowmeters 8 obtaining and flowmeter to be calibrated 11 by said process, the error that between reference flowmeter socket 2 and the flowmeter socket 3 to be calibrated because pipeline section position, outlet structure, stream condition etc. are caused is given to have got rid of and is gone out, and resulting relation has higher precision.Because each timing signal, No. 1 proving flowmeter 7 all is to adopt number synchronously with flowmeter 11 to be calibrated, and the canonical function relation between No. 1 proving flowmeter 7 and No. 2 proving flowmeters 8 also is to adopt the data analysis of synchronous acquisition to come out, so No. 2 proving flowmeters 8 that obtain by software analysis and the data between the flowmeter to be calibrated 11 are placed on the data that the same position synchro measure obtains to being equivalent at one time with two flowmeters.Like this,, and do not require that air flow-producing device 4 each stream conditions that produce are all identical, do not require that volume control device 6 can accurately arrive a certain flow value with flow control yet for the just reduction greatly of requirement of air flow-producing device 4 and volume control device 6.4 needs of air flow-producing device can provide the enough big flow of required measurement range to get final product, and volume control device 6 then only needs and can become several big probable value from small to large just passable flow control.Adopt described calibration function relational expression 12, can treat the performance of proving flowmeter and assess or its data are compensated.According to producing needs, a plurality of flowmeter sockets 3 to be measured can be set on straight pipeline 1, demarcate efficient to improve.Because conversion process is based on the software analysis process, the processing time is very short, and need not to understand concrete principle of work for operating personnel, is equivalent to semi-automatic demarcation mode, the calibration process that is suitable for producing in batches.
Claims (4)
1. air-flow meter calibration method based on software analysis technology, it is characterized in that the demarcation hardware system that is adopted comprises a straight pipeline, it is provided with a proving flowmeter socket and a plurality of flowmeter socket to be calibrated, flow meter data on described proving flowmeter socket and the flowmeter socket to be calibrated adopts the multi-path data acquiring system synchronous acquisition, converts proving flowmeter and flowmeter to be measured after utilizing the software analysis method with the data compare of analysis on two sockets then in the pairing data of same socket synchronization.
2. air-flow meter calibration method according to claim 1, it is characterized in that on proving flowmeter socket and flowmeter socket to be calibrated, all loading onto proving flowmeter earlier, obtain the canonical function relation through software analysis after adopting the multi-path data acquiring system image data, on flowmeter socket to be calibrated, load onto flowmeter to be calibrated then, after the multi-path data acquiring system image data, adopt software analysis technology reference standard funtcional relationship will measured data-switching have become standard exclusion the later calibration function of multiple error effect concern.
3. air-flow meter calibration method according to claim 1, it is characterized in that described software analysis method can convert the output data of the proving flowmeter on the described proving flowmeter socket to the output data of the proving flowmeter on the flowmeter socket to be calibrated, thereby obtain more accurate nominal data.
4. air-flow meter calibration method according to claim 1 is characterized in that can being provided with on the described straight pipeline a plurality of flowmeters to be calibrated and demarcates efficient to improve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2008102117423A CN101435715A (en) | 2008-09-24 | 2008-09-24 | Air-flow meter calibration method based on software analysis technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008102117423A CN101435715A (en) | 2008-09-24 | 2008-09-24 | Air-flow meter calibration method based on software analysis technology |
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| CN101435715A true CN101435715A (en) | 2009-05-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101979968A (en) * | 2010-10-14 | 2011-02-23 | 同济大学 | Device and method for testing air quality sensor and air flow sensor |
| CN105865587A (en) * | 2016-05-17 | 2016-08-17 | 中国人民解放军63820部队吸气式高超声速技术研究中心 | Calibration method of engine flowmeter |
| CN109855706A (en) * | 2018-12-20 | 2019-06-07 | 山东省科学院海洋仪器仪表研究所 | A kind of negative-pressure pneumatic conveying experimental provision and experimental method |
| DE102022128366A1 (en) | 2022-10-26 | 2024-05-02 | Endress+Hauser Flowtec Ag | Method for adjusting and/or calibrating a flow meter and flow meter |
-
2008
- 2008-09-24 CN CNA2008102117423A patent/CN101435715A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101979968A (en) * | 2010-10-14 | 2011-02-23 | 同济大学 | Device and method for testing air quality sensor and air flow sensor |
| CN101979968B (en) * | 2010-10-14 | 2013-02-13 | 同济大学 | Device and method for testing air quality sensor and air flow sensor |
| CN105865587A (en) * | 2016-05-17 | 2016-08-17 | 中国人民解放军63820部队吸气式高超声速技术研究中心 | Calibration method of engine flowmeter |
| CN105865587B (en) * | 2016-05-17 | 2017-03-15 | 中国人民解放军63820部队吸气式高超声速技术研究中心 | A kind of scaling method of electromotor effusion meter |
| CN109855706A (en) * | 2018-12-20 | 2019-06-07 | 山东省科学院海洋仪器仪表研究所 | A kind of negative-pressure pneumatic conveying experimental provision and experimental method |
| CN109855706B (en) * | 2018-12-20 | 2024-03-29 | 山东省科学院海洋仪器仪表研究所 | Negative pressure pneumatic conveying experimental device and experimental method |
| DE102022128366A1 (en) | 2022-10-26 | 2024-05-02 | Endress+Hauser Flowtec Ag | Method for adjusting and/or calibrating a flow meter and flow meter |
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Application publication date: 20090520 |