CN102944292A - Car air quality flow meter calibration device and calibration method - Google Patents
Car air quality flow meter calibration device and calibration method Download PDFInfo
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- CN102944292A CN102944292A CN2012104931018A CN201210493101A CN102944292A CN 102944292 A CN102944292 A CN 102944292A CN 2012104931018 A CN2012104931018 A CN 2012104931018A CN 201210493101 A CN201210493101 A CN 201210493101A CN 102944292 A CN102944292 A CN 102944292A
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Abstract
The invention discloses a car air quality flow meter calibration device and calibration method. More than two parallel-connected calibration pipelines are connected on a measuring pipeline in series, the calibration pipes are provided with a plurality of calibrated flow meter ports, and the measuring pipeline is provided with ventilating facilities, a standard flow meter and/or reference flow meter, a sensor, a heating device and a cooling device. A data collecting port of a computer is connected with the reference flow meter, the standard flow meter, a calibrated flow meter and a signal output line of the sensor, a communication port is connected with a data line of the calibrated flow meter, a control port is connected with each device, and a calibration algorithm of a transfer function is stored in the computer. Target data acquired by the standard flow meter and/or reference flow meter and actual measured data are compared, and the transfer function is calibrated by the computer and stored in a storage space of the calibrated flow meter again to serve as a later standard. The car air quality flow meter calibration device and calibration method can calibrate the transfer function of the flow meter on the basis of not changing hardware structure, and is suitable for mass production.
Description
Technical field
The present invention relates to calibrating installation and the calibration steps of automotive air quality flow meters.
Background technology
The measurement of thermal type gas quality flow is to utilize heat exchange principle to measure air mass flow.The automobile air mass flowmeter generally adopts thermal flowmeter, be installed on the inlet channel between automobile filter and the air throttle, be used for measuring the air capacity that sucks in the engine, its output signal determines basic fuel injection amount and the injection time of automobile as the major parameter of control fuel injection amount in the motor car engine fuel oil electric injection system.Because air flow meter is very large on vehicle performance impact, directly affect the overall performances such as dynamic property, economy, oil consumption, exhaust emissions index of motor car engine, so the calibration of automobile air flow meter also becomes an important job.
Present already present gas flow caliberating device, calibrating installation, or calibration equipment, its essence all only is to detect the actual output of tested flowmeter and the desirable difference of exporting by device, judges that with this it is available or unavailable, but can not correct this species diversity.
Present most automotive air quality flow meters is based on the design of hot type principle, and its sensing principle is divided into two large class, constant difference formula and heat distribution formulas.Constant difference formula air flowmeter is to exceed a stationary temperature than gas flow temperature with the resistance heated on the thermal probe, when air flows through thermal probe, with the heat of taking away on the thermal probe, flow is larger, the heat of taking away is more, and the heat that utilizes the measurement Air Flow to take away is measured the flow of tested air indirectly.Heat distribution formula air flowmeter is to settle respectively temperature measurement structure in the upstream and downstream of heating resistor, when air flows through thermal probe, Temperature Distribution in the thermal probe around the heater element is changed, the temperature of downstream fluid is higher than the temperature of fluid upstream, flow is larger, the temperature of downstream fluid exceeds more many than upstream temperature, utilize and measure the flow that the heater element upstream and downstream temperature difference is measured fluid indirectly.
No matter be constant difference formula flowmeter or heat distribution formula flowmeter, all be to obtain the electric signal relevant with flow from thermal probe, it is the primitive relation of air mass flow and output voltage, then the way of using hardware (operational amplifier) conditioning or software to calculate, this original voltage output characteristics is transformed into the desired voltage output characteristics of flowmeter, as shown in Figure 1, curve A is thermal probe output voltage characteristic curve, curve B is flowmeter output voltage characteristic curve, when two agreeing property of curve, illustrate that flow and Voltage-output obtained the optimum coupling relation.
In present automobile air flow meter production method, for the flowmeter of a certain specific model, be flowmeter output voltage characteristic curve with thermal probe output voltage characteristic Curve transform, its transfer function is fixed.The problem that this production model is brought is: 1. because fixing transfer function, the trickle inconsistent of structure or parameter appears in thermal probe production, or occur in the thermal probe assembling process trickle inconsistent, all may cause the variation of thermal probe output voltage characteristic curve, just must cause the variation of flowmeter voltage output characteristics curve according to fixing transfer function, the flowmeter voltage output characteristics is inconsistent in causing producing in batches, has reduced precision and the qualification rate of product; 2. to guarantee fixing and accurate functional transformation relation, when using hardware (operational amplifier) when realizing, the highly stable and high precision of inevitable requirement build-out resistor, thereby for the manufacturer of high-quality flowmeter, a large amount of resistance needs the laser adjustment, has improved production cost.3. the automobile of different model uses the flowmeter of different model, the flowmeter of different model requires to have different output voltage relation curves, this will cause requiring in process of production to design the needs that a large amount of hardware circuits satisfies the different model flowmeter, so that the production inventory cost increases.
The result of above-mentioned condition is that its economic strength is relied on by minority leading enterprise, adopt the expensive mode of high starting point, each link of accurate production control process, produce high-quality flow motor sensor, long-term monopolization flow motor meter market, and medium-sized and small enterprises use cheaply thermal probe owing to forming enough batches mostly, the thermal probe resistance precision, the physical dimension precision, manufacturing process, the fine difference of assembling measure of precision etc. all can bring enough large impact to thermal probe output voltage characteristic curve, and the conversion method of fixed function, it is then helpless when thermal probe output voltage characteristic curve changes, add the inconsistent and dispersed of circuit elements device parameter, the precision of the flowmeter of producing like this and consistance can't guarantee, in case demarcate the product of finding not meet quality requirements, just can only work as substandard products or waste disposal, thereby the flowmeter quality that causes most medium-sized and small enterprises to be produced is low.
Aspect the demarcation calibration equipment, someone has proposed a kind of calibration equipment of easy T-shaped pipe mode, air generator produces air-flow, behind T-shaped pipe, be divided into two branch roads, one the tunnel connects proving flowmeter, and another road connects by the checking flow meter, supposes that air-flow is mean allocation at two branch roads, the output voltage of contrast standard flowmeter and tested flowmeter just can draw the difference of tested flowmeter and proving flowmeter.The someone thinks that there are a lot of problems such as precision, repeatability in T-shaped tubular construction again.Even think that simultaneously cascaded structure can not guarantee precision, even in a pipeline, the difference of flowmeter installation position, because the effect of various influence factors also can produce error, be same flowmeter is installed on pipeline under same traffic diverse location, its output voltage may be because various influence factors and difference.According to this thought, someone proposes before demarcation, on proving flowmeter interface and tested flowmeter interface, all insert proving flowmeter, wherein be placed in proving flowmeter on the tested flowmeter interface and be used for the error of measurement interface position, and this error is stored in the computing machine, in formal the demarcation, be used for the compensated position error.But the consistance that the method can't validation criteria flowmeter itself, this method supposition proving flowmeter is consistent standard, if under same traffic, the output voltage of proving flowmeter there are differences, so just think that this species diversity is the difference that the factors such as pipeline location cause, there is the risk that the propagation of error of proving flowmeter is arrived calibration equipment in this thinking, may strengthen on the contrary the error of demarcation under extreme case.The common employed proving flowmeter of these technology, it is not the flowmeter with metering Transfer Standards, but the general-utility car air flowmeter of some Premium Brands, thereby under this condition, these devices at most also can only verification hang down the automobile air flow meter of accuracy class than the flowmeter of Premium Brands.
Above-mentioned calibration equipment all exists following common problem: 1. flow standard problem, whether a flow that recurs and have definite precision can be provided is the key of this problem.2. said apparatus only is detection means, whether the automobile air flow meter of producing by the testing process check has the voltage output characteristics identical with the high-quality automobile air flow meter, as previously mentioned, the resistance of thermal probe in the automobile air flow meter, physical dimension, the series of factors such as flowmeter assembling process all will affect the voltage output characteristics of thermal probe, in large-scale production, be difficult to guarantee its consistance, disposal route according to the fixed conversion function, output voltage feature inconsistent that must cause flowmeter, this problem do not solve all the time.Particularly when the relatively poor thermal probe of using character, this problem is more serious.
In sum, whether these pick-up units also all only check flowmeter qualified at most, do not have the function of calibration.
Summary of the invention
In order to make in the batch production flowmeter voltage output characteristics consistent, improve precision and the qualification rate of product, the calibrating installation and the calibration steps that the purpose of this invention is to provide a kind of automotive air quality flow meters, carry out communication by computing machine and each tested flowmeter, according to the original flow of actual measurement thermal probe and the relation of output voltage, adjust in real time the function transformational relation between thermal probe output voltage and the flowmeter output voltage, so that the voltage output characteristics of each tested flowmeter voltage output characteristics and proving flowmeter is consistent, think that namely each tested flowmeter has obtained calibration.
Therefore, the technical scheme that the present invention takes is: a kind of calibrating installation of automotive air quality flow meters, it is by computer control, be provided with control interface, communication interface, data acquisition interface on the computing machine, computer-internal is provided with and is implanted with flowmeter transfer function correcting algorithm in device control module, data acquisition module, data processing module, communication module, the data processing module, leaves the reference address of each calibrated flowmeter interface in the communication module; The calibration pipeline that two more parallels are arranged, be connected in series in after the parallel connection on the same measuring channel, described measuring channel has ventilation equipment, be provided with proving flowmeter and/or reference flowmeter on the measuring channel, and temperature, humidity, flow, pressure, wind speed measuring sensor and heating, refrigerating plant, described each bar calibration pipeline and measuring channel among are provided with described electrically operated valve, a plurality of calibrated flowmeter interfaces are installed on the described calibration pipeline, and calibrated flowmeter is installed on each interface; The data acquisition interface of computing machine is connected to carry out signal with the output line of reference flowmeter, proving flowmeter, calibrated flowmeter, sensor and transmits; The communication interface of computing machine is connected with the data line of calibrated flowmeter, to corresponding calibrated flowmeter transmission transfer function algorithm, stores in the nonvolatile memory of corresponding calibrated flowmeter; The control interface of computing machine is connected with the control line of heating arrangement, refrigerating plant, electrically operated valve, Fan Equipment.
Further, on each described calibration pipeline, be laid with 2 above calibrated flowmeter interfaces along the length of pipeline direction.
Connecting fan between the air outlet of described calibration pipeline and the air intake vent of measuring channel, the outlet of blower fan connects the entrance of measuring channel, the entrance of blower fan connects the outlet of calibration pipeline, is connected with speed regulator at described blower fan, and described speed regulator links to each other with computer control interface.
A kind of calibration steps of automotive air quality flow meters comprises following steps:
1) adjusting gear enters normal operating conditions, and default condition of work is installed calibrated flowmeter to the calibration pipeline; Open wherein calibration pipeline, other calibrate closedown of pipeline;
2) obtain target data by computing machine, wherein comprise the data under each calibration point flow, described target data just refers in trimming process, be used for as the air mass flow of standard and the characteristic relation of output voltage,
Target data obtains by one of following three kinds of modes:
1. obtain by normal air mass flowmeter sampling pitot tube mode, and calculate the relation of gas mass flow and output voltage;
2. obtain by the reference flowmeter: measures the flow of every reference flowmeter-output voltage characteristic relation, according to the flow of mean value method calculating reference flowmeter-output voltage characteristic curve;
3. with the theoretical output voltage characteristic of calibrated flowmeter as target data;
3) obtained the measurement data of calibrated flowmeter by computing machine, described measurement data just refers to calibrated flowmeter under the transfer function of storage that dispatches from the factory, the actual flow that draws and the characteristic relation of output voltage.
4) by target data corresponding under the computing machine comparison calibration point flow and the difference of measurement data, if find that both output characteristics are consistent, then being considered as this calibrated flowmeter is qualified flowmeter, and the transfer function of its original storage is effective; If find that both output characteristics are inconsistent, then proofread and correct the transfer function model of calibrated flowmeter, until measurement data is with till target data is consistent, and the correction function model of every flowmeter is transferred in the nonvolatile memory of this flowmeter, cover original transfer function, as the true translation function in the real work;
5) close and calibrate complete calibration pipeline, open next pipeline to be calibrated, according to 2)～4) the step calibration.
On the described calibration pipeline branched calibrated flowmeter is installed, each calibrated flowmeter all links to each other with computing machine.
Store the various different pieces of informations of calibrating in the computing machine, and have corresponding compensating parameter.
The Application standard pitot tube is as the standard component of calibration point flow measurement, and its precision is transmitted by the highest metering mechanism of China Leather trustship verification.
Step 3)～4), choose 9-11 traffic alignment point, comprise zero flow and maximum flow, calibrated flowmeter is inserted respectively on the calibrated flowmeter interface; The computer control rotation speed of fan is from zero flow, progressively run to each calibration point flow, the output voltage of each calibrated fluxes down-off meter thermal probe of computer recording, the Voltage-output characteristic curve of while establishing criteria flowmeter, calculate the theoretical output voltage of this flow down-off meter, form thus a series of corresponding data groups, according to these a series of corresponding data groups, Computer is calculated the Quadratic Spline Interpolation Computation function model of every calibrated flowmeter, again the parameter of this model is transferred to the non-volatile storage space of corresponding flowmeter, with this as the calibration after transfer function.
The present invention is owing to take above technical scheme, its beneficial effect that has is: the present invention and present already present flow calibrating device, or the difference of calibrating installation, calibration equipment etc. is: detect the actual output of tested flowmeter and the desirable difference of exporting by device, and do not changing under the flowmeter hardware condition of (comprising structure, encapsulation and component parameter), change the Voltage-output feature of flowmeter by the software algorithm that changes calibrated flowmeter, make it consistent with the Voltage-output characteristic curve of desirable flowmeter.The flow of computing machine in the device by measure obtaining the calibrated flowmeter thermal probe/output voltage primitive character curve, and according to desirable flow/Voltage-output characteristic curve, formation is converted into primary curve the algorithm of ideal curve, computing machine is delivered to this algorithm in the non-volatile storage space of calibrated flowmeter, thereby allows the desirable flow of calibrated flowmeter output/output voltage characteristic relation.
Theoretically, the precision of using the automobile air flow meter that the present invention produces is more near the precision of caliberating device.Device of the present invention goes for large-scale production and application, be designed with two or the many calibration pipelines that parallel connection can be taken turns to change jobs, be connected on the same measuring channel, be designed with a plurality of calibrated flowmeter interfaces on the every calibration pipeline, therefore produced a kind of present brand-new flow motor meter calibrating method that is different from fully.
Calibration to automobile air flow meter can be carried out the calibration of voltage output characteristics according to the normal air mass flowmeter, also can carry out according to the output voltage characteristic of reference flowmeter the reference calibration.
Produce fast the automotive air quality flow meters of high precision by inputting applicable function corresponding to this flowmeter probe.Can be with fine difference and the inconsistency of bringing owing to the error of machining through such process, measure accurately when the device debugging and use computing machine to compensate by software, can carry out recalibration.In other words, even the relation of the original flow of thermal probe and output voltage is inconsistent, by method of the present invention, also can produce highly consistent final products, thereby greatly reduce in the production run to the technological requirement of probe with to the harsh requirement of whole production technology, decrease cost.Solved simultaneously the problem that aforementioned high-end enterprise exists in the process of producing automobile air flow meter.
Description of drawings
Fig. 1 is the output voltage characteristic curve map of flowmeter thermal probe and flowmeter;
Fig. 2 is the hardware connection diagram of calibrating installation of the present invention;
Among the figure: A-thermal probe output voltage characteristic curve, B-flowmeter output voltage characteristic curve, 1-computing machine, the 2-control interface, 3-communication interface, 4-data acquisition interface, 5,6-calibration pipeline, 7-measuring channel, 8,9,17, the 18-electrically operated valve, 10-calibrated flowmeter interface, 11-heating arrangement, 12-refrigerating plant, the 13-sensor, 14-reference flowmeter interface, 15-proving flowmeter interface, the 16-blower fan, 19-fan speed regulation device.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
The calibrating installation of automotive air quality flow meters provided by the invention, by computer control, be provided with control interface, communication interface, data acquisition interface on the computing machine, computer-internal is provided with device control module, data acquisition module, data processing module, communication module, be implanted with flowmeter transfer function correcting algorithm in the data processing module, leave the reference address of each calibrated flowmeter interface in the communication module.Device is provided with the calibration pipeline of two more parallels, calibration pipeline after the parallel connection is connected on the same measuring channel, measuring channel has ventilation equipment, is provided with proving flowmeter and/or reference flowmeter at measuring channel, and the survey sensor such as temperature, humidity, flow, pressure, wind speed.On the calibration pipeline a plurality of calibrated flowmeter interfaces are installed, are used for installing calibrated flowmeter.
The data acquisition interface of computing machine is connected to carry out signal with the output line of reference flowmeter, proving flowmeter, calibrated flowmeter, sensor and transmits; The communication interface of computing machine is connected with the data line of calibrated flowmeter, to corresponding calibrated flowmeter transmission voltage transfer function, stores in the nonvolatile memory of corresponding calibrated flowmeter; The control interface of computing machine is connected with the control line of the equipment such as well heater, refrigerator, electrically operated valve, blower fan, controls the unlatching activity of each equipment.
As shown in Figure 2, as a typical embodiment, this calibrating installation comprises computing machine 1, with control interface 2, communication interface 3, data acquisition interface 4.Article at least two, calibration pipeline: calibration pipeline 5 and calibration pipeline 6, be connected in parallel on the measuring channel 7, two calibration pipelines have electrically operated valve 8,9 to control with the measuring channel among, and the control line of electrically operated valve is connected on the control interface 2 of computing machine.On the calibration pipeline, along the length of pipeline direction, be laid with 2 above calibrated flowmeter interfaces 10, preferably, be equipped with 4～8 calibrated flowmeter interfaces, be used in the interface inserting the flowmeter that is calibrated, flowmeter links to each other with communication interface 3, the data acquisition interface 4 of computing machine.On the measuring channel 7, be provided with heating arrangement 11, refrigerating plant 12, the temperature/humidity/pressure/survey sensors such as speed 13, the control line of heating arrangement 11, refrigerating plant 12 links to each other with the control interface of computing machine 2, and the output line of sensor 13 links to each other with the data acquisition interface of computing machine 4; Also has reference flowmeter interface 14 and proving flowmeter interface 15 on the measuring channel 7, reference flowmeter and proving flowmeter (proving flowmeter is actually the flowmeter than tested flowmeter higher level) are installed respectively on two interfaces, and the output line of reference flowmeter and proving flowmeter all is connected on the data acquisition interface 4 of computing machine.
As another kind of embodiment, this device can adopt the closed circulation pipe method to ventilate.Between the air intake vent of calibration pipeline 5,6 air outlet and measuring channel 7, be connected a blower fan 16, the outlet of blower fan connects the entrance of measuring channel 7, the entrance of blower fan connects the outlet of calibration pipeline, makes the three form closed circulating line, dotted line coupling part as shown in Figure 2.Further, at calibration pipeline 5,6 air outlet place two electrically operated valves 17,18 are set also, connect speed regulator 19 at blower fan, blower fan 16, electrically operated valve 17,18, speed regulator 19 all link to each other with the control interface 2 of computing machine.Change at needs in the situation of temperature, this recycle design can obviously reduce energy consumption.
As another kind of embodiment, the calibration pipeline can also can increase the quantity of the calibrated flowmeter interface on the calibration pipeline more than two, to improve the efficient of calibrating installation.When a certain calibration pipeline is in running order, the valve open of computer control calibration pipeline both sides, other closedown of pipeline; When the flowmeter on the calibration pipeline was replaced or installs, its both sides valve was closed.Each has the reference address of oneself by oneself to branched calibrated flowmeter in computing machine, and computing machine can carry out multiplex communication simultaneously.
This device dependence computing machine is finished the calibration to tested flowmeter, and a kind of method of utilizing this device to carry out the automotive air quality flow meters calibration is:
1) adjusting gear enters normal operating conditions, and default condition of work is such as temperature, and pressure, wind speed etc. are installed calibrated flowmeter to the calibration pipeline to constant, open wherein pipeline, other closedown of pipeline.
2) computing machine obtains target data, wherein comprises the data under each calibration point flow, and described target data just refers in trimming process, is used for as the air mass flow of standard and the characteristic relation of output voltage.
Target data can obtain by one of following three kinds of modes:
1. obtain by normal air mass flowmeter sampling pitot tube mode, and calculate the relation of gas mass flow and output voltage;
2. obtain by the reference flowmeter: measures the flow of every reference flowmeter-output voltage characteristic relation, according to the flow of mean value method calculating reference flowmeter-output voltage characteristic curve;
3. with the theoretical output voltage characteristic of calibrated flowmeter as target data.
3) computing machine obtains the measurement data of calibrated flowmeter, and described measurement data just refers to calibrated flowmeter under the transfer function of storage that dispatches from the factory, the actual flow that calculates and the characteristic relation of output voltage.
4) target data of correspondence and the difference of measurement data under the computing machine comparison calibration point flow, if find that both output characteristics are consistent, then being considered as this calibrated flowmeter is qualified flowmeter, the transfer function of its original storage is effective; If find that both output characteristics are inconsistent, then proofread and correct the transfer function model of calibrated flowmeter, until measurement data is with till target data is consistent, correcting algorithm adopt of the prior art any can, and the function model after the correction of every flowmeter is transferred in the nonvolatile memory of this flowmeter, each flowmeter covers original transfer function, so that can access the calibration function of calibrating for the probe state of this individuality flowmeter.
5) close and calibrate complete calibration pipeline, open next pipeline to be calibrated, according to 2)～4) the step calibration.
Since be provided with a plurality of calibrations mouths on the calibration pipeline, again because computing machine has the reference address of a plurality of calibrated flowmeters, thus can carry out simultaneously the calibration of branched air flowmeter on the pipeline, and once finish.The margin of error that causes owing to various factors between the diverse location on different pipelines and the same pipeline all is permanently stored in the computing machine calibration software in advance, and carries out corresponding compensation.Each calibrated flowmeter and computing machine real-time communication, the various different pieces of informations that are used for calibrating are input in the calibration software in advance, and calibration software just can be calibrated or the standard output family curve is transplanted in the calibrated flowmeter calibrated flowmeter and realize calibration.
As one preferably embodiment be that several calibration pipelines that are arranged in parallel are taken turns current test one by one, during flowmeter on pipeline of test, other device for cleaning pipelines are crossed valve and are dammed, and after this pipeline is completed, close this pipeline valve, open another pipeline valve, take turns current test, carrying out a pipeline test period, can prepare another pipeline like this, save time, improved work efficiency.
On the flow standard problem, Application standard pitot tube of the present invention is as the standard component of calibration point flow measurement, and its precision is transmitted by the highest metering mechanism (National Meteorological Bureau) of China Leather trustship verification.
Different according to the mode of obtaining target data, the calibration flow process that the embodiment of the invention relates to comprises two modes, i.e. standard calibration mode and reference calibrating mode.Dual mode all is with the flowmeter output voltage characteristic curve of thermal probe output voltage characteristic curve through the calibration outputting standard, but the calibration of dual mode is with reference to difference.
1. standard calibration mode.
So-called standard calibration mode refers to the calibrating mode that carries out as foundation take the measured flowrate measurement value of calibrating gas mass flowmeter.
Under the condition of known calibrated flowmeter theoretical voltage output characteristic curve, can calibrate automotive air quality flow meters by the Application standard calibrating mode, flowmeter Voltage-output characteristic curve, can obtain according to the discrete point of theoretical output voltage corresponding to different flow down-off meter, also can be the calculation expression that concrete output voltage (Volt) changes with flow (kf/h).
Suppose to choose 9-11 traffic alignment point, comprise zero flow and maximum flow, selecting calibration pipeline 5 is service pipe, and calibrated flowmeter is inserted respectively calibrated flowmeter interface 10-1,10-2, and 10-3 is on the 10-n; The computer control rotation speed of fan is from zero flow, progressively run to each calibration point flow, the output voltage of each calibrated fluxes down-off meter thermal probe of computer recording, the Voltage-output characteristic curve of while establishing criteria flowmeter, calculate the theoretical output voltage of this flow down-off meter, form thus a series of corresponding data groups, according to these a series of corresponding data groups, Computer is calculated the Quadratic Spline Interpolation Computation function model of every calibrated flowmeter, again the parameter of this model is transferred to the non-volatile storage space of corresponding flowmeter, with this as the calibration after transfer function.After finishing calibration, the thermal probe voltage data of computer acquisition all calculates output voltage according to the given computing method of non-volatile storage space, by the D/A conversion calculated value is become the output of virtual voltage output valve.The flowmeter that is calibrated has the precision that approaches with calibrating installation in theory.
Above-mentioned calibration process computing machine is finished automatically, and during this period, operating personnel carry out the installation and removal work of calibrated flowmeter at the inoperative pipeline, and the periodic duty of two calibration pipelines is to improve the efficient of device.
If flowmeter need to carry out temperature compensation, use the same method, the gas flow temperature of control calibrating installation can compensate calibration to temperature.
2. reference calibrating mode.
So-called reference calibration refers to calibrate front and does not know the output voltage characteristic curve of calibrated flowmeter theory, but the air flow meter sample with some need to be calibrated production as benchmark in the average output characteristic of sample flow.As for the calibration steps behind the standard, the same with the standard calibration mode.
The reference calibration can use two kinds of methods to finish:
1) in the situation of not knowing reference flowmeter output voltage characteristic curve, select first branched reference flowmeter, measure the flow of every reference flowmeter-output voltage characteristic curve, calculate the output voltage characteristic curve of reference flowmeter as standard according to the mean value algorithm, the same with the standard calibration mode afterwards, choose 9-11 traffic alignment point, comprise zero flow and maximum flow, selecting a certain calibration pipeline is service pipe, calibrates (as mentioned above) according to standard mode sampling, calculating, storage means.
2) in the situation of known reference flowmeter output voltage characteristic curve, the same according to the standard calibration mode directly as calibration reference, sample, calculate, calibrate, store and get final product.Just the selection of reference flowmeter is very crucial, and the height of precision has directly determined the effect of calibration.
The various embodiments described above only are used for explanation the present invention; wherein the structure of each parts, connected mode and method step etc. all can change to some extent; every equivalents and improvement of carrying out on the basis of technical solution of the present invention all should do not got rid of outside protection scope of the present invention.
Claims (8)
1. the calibrating installation of an automotive air quality flow meters, it is characterized in that: by computer control, be provided with control interface, communication interface, data acquisition interface on the computing machine, computer-internal is provided with and is implanted with flowmeter transfer function correcting algorithm in device control module, data acquisition module, data processing module, communication module, the data processing module, leaves the reference address of each calibrated flowmeter interface in the communication module;
The calibration pipeline that two more parallels are arranged, be connected in series in after the parallel connection on the same measuring channel, described measuring channel has ventilation equipment, be provided with proving flowmeter and/or reference flowmeter at measuring channel, and temperature, humidity, flow, pressure, wind speed measuring sensor and heating, refrigerating plant, described each bar calibration pipeline and measuring channel among are provided with described electrically operated valve, a plurality of calibrated flowmeter interfaces are installed on the described calibration pipeline, and calibrated flowmeter is installed on each interface;
The data acquisition interface of computing machine is connected to carry out signal with the output line of reference flowmeter, proving flowmeter, calibrated flowmeter, sensor and transmits; The communication interface of computing machine is connected with the data line of calibrated flowmeter, to corresponding calibrated flowmeter transmission transfer function algorithm, stores in the nonvolatile memory of corresponding calibrated flowmeter; The control interface of computing machine is connected with the control line of heating arrangement, refrigerating plant, electrically operated valve, Fan Equipment.
2. the calibrating installation of automotive air quality flow meters according to claim 1 is characterized in that: on each described calibration pipeline, be laid with 2 above calibrated flowmeter interfaces along the length of pipeline direction.
3. the calibrating installation of automotive air quality flow meters according to claim 1, it is characterized in that: connecting fan between the air outlet of described calibration pipeline and the air intake vent of measuring channel, the outlet of blower fan connects the entrance of measuring channel, the entrance of blower fan connects the outlet of calibration pipeline, be connected with speed regulator at described blower fan, described speed regulator links to each other with computer control interface.
4. the calibration steps of the automotive air quality flow meters that carries out such as device as described in one of claim 1～3 of a utilization is to comprise following steps:
1) adjusting gear enters normal operating conditions, and default condition of work is installed calibrated flowmeter to the calibration pipeline; Open wherein calibration pipeline, other calibrate closedown of pipeline;
2) obtain target data by computing machine, wherein comprise the data under each calibration point flow, described target data just refers in trimming process, be used for as the air mass flow of standard and the characteristic relation of output voltage,
Target data obtains by one of following three kinds of modes:
1. obtain by normal air mass flowmeter sampling pitot tube mode, and calculate the relation of gas mass flow and output voltage;
2. obtain by the reference flowmeter: measures the flow of every reference flowmeter-output voltage characteristic relation, according to the flow of mean value method calculating reference flowmeter-output voltage characteristic curve;
3. with the theoretical output voltage characteristic of calibrated flowmeter as target data;
3) obtained the measurement data of calibrated flowmeter by computing machine, described measurement data just refers to calibrated flowmeter under the transfer function of storage that dispatches from the factory, the actual flow that draws and the characteristic relation of output voltage.
4) by target data corresponding under the computing machine comparison calibration point flow and the difference of measurement data, if find that both output characteristics are consistent, then being considered as this calibrated flowmeter is qualified flowmeter, and the transfer function of its original storage is effective; If find that both output characteristics are inconsistent, then proofread and correct the transfer function model of calibrated flowmeter, until measurement data is with till target data is consistent, and the correction function model of every flowmeter is transferred in the nonvolatile memory of this flowmeter, cover original transfer function, as the true translation function in the real work;
5) close and calibrate complete calibration pipeline, open next pipeline to be calibrated, according to 2)～4) the step calibration.
5. the calibration steps of automotive air quality flow meters according to claim 4, it is characterized in that: on the described calibration pipeline branched calibrated flowmeter is installed, each calibrated flowmeter all links to each other with computing machine.
6. the calibration steps of automotive air quality flow meters according to claim 4 is characterized in that: store the various different pieces of informations of calibrating in the computing machine, and have corresponding compensating parameter.
7. the calibration steps of automotive air quality flow meters according to claim 4 is characterized in that: the Application standard pitot tube is as the standard component of calibration point flow measurement, and its precision is transmitted by the highest metering mechanism of China Leather trustship verification.
8. the calibration steps of automotive air quality flow meters according to claim 4, it is characterized in that: step 3)～4) in, choose 9-11 traffic alignment point, comprise zero flow and maximum flow, calibrated flowmeter is inserted respectively on the calibrated flowmeter interface; The computer control rotation speed of fan is from zero flow, progressively run to each calibration point flow, the output voltage of each calibrated fluxes down-off meter thermal probe of computer recording, the Voltage-output characteristic curve of while establishing criteria flowmeter, calculate the theoretical output voltage of this flow down-off meter, form thus a series of corresponding data groups, according to these a series of corresponding data groups, Computer is calculated the Quadratic Spline Interpolation Computation function model of every calibrated flowmeter, again the parameter of this model is transferred to the non-volatile storage space of corresponding flowmeter, with this as the calibration after transfer function.
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| CN104864945A (en) * | 2015-06-12 | 2015-08-26 | 武汉飞恩微电子有限公司 | Flow sensor batch test pipeline system based on sampling flow passages |
| CN106643989A (en) * | 2016-11-22 | 2017-05-10 | 重庆川仪自动化股份有限公司 | Density Calibration System and Method for Mass Flow Meter |
| CN106679770A (en) * | 2016-11-22 | 2017-05-17 | 重庆川仪自动化股份有限公司 | Mass calibration system and method for mass flow meter |
| CN106840284A (en) * | 2016-12-22 | 2017-06-13 | 汇众翔环保科技河北有限公司 | Based on multitube Pitot tube matrix form flow system and measuring method |
| CN110864773A (en) * | 2019-12-03 | 2020-03-06 | 镇江市计量检定测试中心 | Method and system for on-line inspection of accuracy of solid flowmeter |
| CN111189514A (en) * | 2019-12-31 | 2020-05-22 | 潍柴动力股份有限公司 | Mass flow sensor output correction method, mass flow sensor output correction device, mass flow sensor output correction controller and medium |
| CN112697976A (en) * | 2020-12-18 | 2021-04-23 | 汉威科技集团股份有限公司 | Gas path flow real-time dynamic adjusting method, system and storage medium |
| CN114427902A (en) * | 2021-12-30 | 2022-05-03 | 广东旭诚科技有限公司 | Automatic flow inspection device based on Internet of things and steady-state curve algorithm and application thereof |
| CN114623904A (en) * | 2022-03-14 | 2022-06-14 | 中公高远(北京)汽车检测技术有限公司 | Calibration device and method for gas flowmeter |
| CN114705257A (en) * | 2022-03-30 | 2022-07-05 | 西安奥若特材料技术有限公司 | A kind of pipeline flow distribution method |
| CN116698162A (en) * | 2023-06-27 | 2023-09-05 | 青岛乾程科技股份有限公司 | Gas flow error checking system, testing method thereof and gas meter error checking method |
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| CN104864945A (en) * | 2015-06-12 | 2015-08-26 | 武汉飞恩微电子有限公司 | Flow sensor batch test pipeline system based on sampling flow passages |
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| CN106679770A (en) * | 2016-11-22 | 2017-05-17 | 重庆川仪自动化股份有限公司 | Mass calibration system and method for mass flow meter |
| CN106679770B (en) * | 2016-11-22 | 2024-02-27 | 重庆川仪自动化股份有限公司 | Mass calibration system and method for mass flowmeter |
| CN106840284A (en) * | 2016-12-22 | 2017-06-13 | 汇众翔环保科技河北有限公司 | Based on multitube Pitot tube matrix form flow system and measuring method |
| CN110864773A (en) * | 2019-12-03 | 2020-03-06 | 镇江市计量检定测试中心 | Method and system for on-line inspection of accuracy of solid flowmeter |
| CN111189514A (en) * | 2019-12-31 | 2020-05-22 | 潍柴动力股份有限公司 | Mass flow sensor output correction method, mass flow sensor output correction device, mass flow sensor output correction controller and medium |
| CN112697976A (en) * | 2020-12-18 | 2021-04-23 | 汉威科技集团股份有限公司 | Gas path flow real-time dynamic adjusting method, system and storage medium |
| CN114427902A (en) * | 2021-12-30 | 2022-05-03 | 广东旭诚科技有限公司 | Automatic flow inspection device based on Internet of things and steady-state curve algorithm and application thereof |
| CN114427902B (en) * | 2021-12-30 | 2024-03-26 | 广东旭诚科技有限公司 | Flow automatic checking device based on Internet of things and steady-state curve algorithm and application thereof |
| CN114623904A (en) * | 2022-03-14 | 2022-06-14 | 中公高远(北京)汽车检测技术有限公司 | Calibration device and method for gas flowmeter |
| CN114705257A (en) * | 2022-03-30 | 2022-07-05 | 西安奥若特材料技术有限公司 | A kind of pipeline flow distribution method |
| CN116698162A (en) * | 2023-06-27 | 2023-09-05 | 青岛乾程科技股份有限公司 | Gas flow error checking system, testing method thereof and gas meter error checking method |
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