CN115290570A - Auxiliary calibration device and auxiliary calibration method for automobile exhaust detection system - Google Patents
Auxiliary calibration device and auxiliary calibration method for automobile exhaust detection system Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 70
- 239000000428 dust Substances 0.000 claims abstract description 70
- 238000002485 combustion reaction Methods 0.000 claims abstract description 65
- 230000003068 static effect Effects 0.000 claims abstract description 40
- 230000001360 synchronised effect Effects 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims description 347
- 230000008569 process Effects 0.000 claims description 28
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 23
- 239000001301 oxygen Substances 0.000 claims description 23
- 229910052760 oxygen Inorganic materials 0.000 claims description 23
- 238000007789 sealing Methods 0.000 claims description 20
- 238000000605 extraction Methods 0.000 claims description 17
- 230000007246 mechanism Effects 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 13
- 239000003546 flue gas Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 11
- 239000013618 particulate matter Substances 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 9
- 239000000779 smoke Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 241000669618 Nothes Species 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000010408 sweeping Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
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- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010410 dusting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
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- 230000001105 regulatory effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- -1 this Chemical compound 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
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- 229910001882 dioxygen Inorganic materials 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G—PHYSICS
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- G01N15/075—Investigating concentration of particle suspensions by optical means
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
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Abstract
The invention discloses an auxiliary calibration device and an auxiliary calibration method of an automobile exhaust detection system, and belongs to the technical field of detection system calibration 2 Gas cylinder, C 3 H 8 The calibration cavity assembly comprises a base and a cavity body, a left valve plate and a right valve plate which are driven by a linear synchronous opening and closing power device are arranged on the cavity body, and an air inlet nozzle, an air outlet nozzle and a pressure sensor are arranged on the cavity body; the auxiliary calibration device further comprises a combustion dust generating device, a dust outlet of the combustion dust generating device is communicated with the air inlet nozzle through a dust generating pipeline, and a dust concentration detection instrument is arranged on the dust generating pipeline. The auxiliary calibration method uses the auxiliary calibration device, and can meet the requirements of tail in dynamic and static statesGas calibration, the flexibility is higher, and the accuracy is better.
Description
Technical Field
The invention relates to an auxiliary calibration device of an automobile exhaust detection system, belongs to the technical field of calibration, and also relates to an auxiliary calibration method using the auxiliary calibration device.
Background
The tail gas detecting system for automobile can measure the tail gas amount of automobile without affecting the normal running of automobile, and the tail gas of automobile has mainly gaseous pollutant and granular matter, with the gaseous pollutant including CO and CO 2 HC and NO, its theory of operation utilizes the system host computer to send the light beam, when the motor vehicle passes through, the tail gas of motor vehicle can produce the interference to the light beam, characteristics such as spectrum, intensity that the receiving end received can change, and this kind of change can reflect the gas composition concentration and the particulate matter concentration change of measurand tail gas, and present light source has laser, infrared ray thermal radiation light, ultraviolet light and yellow green light.
The automobile exhaust detection system needs to be calibrated before leaving a factory or after being used for a period of time so as to avoid the detection result from having larger errors, and therefore an auxiliary calibration device is needed to be used for calibration.
And the utility model patent for patent No. 202220618669.7 discloses a motor vehicle exhaust remote sensing detection system calibrating device, and this calibrating device includes a supporting component, installs the shell on the supporting component, is provided with the detection air chamber in the shell, then detects the both ends opening of air chamber and realize the switching by the motor drive baffle deflection. According to the utility model discloses a theory of operation records, this kind of calibrating device lets in the gas of known composition to detect the chamber and aerifys, utilize the oxygen gas sensor to detect to be full of the first motor drive baffle rotation in back, make the second through-hole unblocked, the light beam emitter transmission beam, the light beam passes and gets into behind the first through-hole and wear out in the first through-hole of detecting the gas chamber and following the opposite side, finally shine and reflect on the reflector and be received by the receiver, carry out the analysis through the spectrum to receiving light beam, if the analysis result is the same with each composition in the gas, then the detector is accurate, if there is the error then can calibrate the detector, detect once more after the calibration and observe whether accurate.
However, the following technical problems still exist in the structure: 1. the structure is not reasonable, the detection method is very rough, the exhaust emission process of the motor vehicle is complex, the emission process at least comprises two states, one state is instantaneous exhaust emission of the engine, the exhaust detection device is required to accurately detect the dynamic gas components and the content of each component, according to analysis, the flow of the exhaust emission of the general engine is 20L/min, the other state is that after the continuous exhaust emission of the engine, the exhaust in a detection area forms a relatively stable static gas area, the exhaust detection device is required to accurately detect the relatively stable static gas components and the content of each component, obviously, the utility model can not carry out the independent detection of the two states, especially the detection of dynamic gas; firstly, in the scheme, the oxygen sensor stops inflating after detecting full filling, and the first motor drives the baffle to rotate and open after stopping inflating, so that the situation that the gas in the detection chamber cannot flow out from the through opening cannot be determined, because the full filling detected by the oxygen sensor is not limited to the full filling, the full gas can flow out from the outlet of the detection chamber, the flowing-out process is a dynamic process, and the detection flow does not accord with the detection condition of the dynamic gas or the condition of the static gas; secondly, performing a first step; in the scheme, the first motor drives the baffle to rotate, the structure is obviously unreasonable, firstly, the motor needs an acceleration and deceleration process from starting to stopping, and the deflection angle of the baffle is only 90 degrees as can be seen from figure 4, so that the motor is difficult to rapidly drive the baffle to deflect, namely, the motor can only slowly drive the baffle to deflect after being decelerated at all stages, and therefore, the detection of the components of the dynamic gas cannot be met; 2. the calibration device has a simple structure, and the baffle plate needs to be opened and closed frequently, so that the sealing reliability between the baffle plate and the through hole is low; 3. the calibration device can only roughly calibrate the gas composition, and cannot calibrate the concentration of the particulate matters.
Disclosure of Invention
The first technical problem to be solved by the invention is as follows: the auxiliary calibration device can meet the requirements of tail gas calibration in dynamic and static states, has higher flexibility and better calibration accuracy.
The invention aims to solve another technical problem that: the auxiliary calibration method of the automobile exhaust detection system can realize dynamic and static calibration of exhaust and calibration of particulate matter concentration.
In order to solve the first technical problem, the technical scheme of the invention is as follows: an auxiliary calibration device of an automobile exhaust detection system comprises a chassis, wherein a calibration chamber component is mounted outside the chassis, the calibration chamber component comprises a base, a chamber body is fixed on the base through a left side plate and a right side plate, a left through hole and a right through hole are formed in the chamber body, the left through hole and the through hole are coaxially arranged, a left valve plate and a right valve plate are respectively installed on the outer sides of the left through hole and the right through hole on the left side plate and the right side plate in a swinging mode, the left valve plate and the right valve plate are both in transmission connection with a linear synchronous opening and closing power device, and the left valve plate is in sealing fit with the opening edge of the left through hole through a left sealing structure; the right valve plate is in sealing fit with the opening edge of the right port through a right sealing structure, and the cavity body is provided with an air inlet nozzle, an air outlet nozzle and a pressure sensor;
the machine box is internally provided with a partition plate which divides the machine box into an upper chamber and a lower chamber, and a CO gas storage bottle and a CO gas storage tank are placed in the lower chamber 2 Gas bomb, C 3 H 8 Gas cylinders, NO gas cylinders; a CO electromagnetic valve and CO are fixed in the upper chamber 2 Electromagnetic valve, C 3 H 8 Electromagnetic valve, NO electromagnetic valve, standard gas flowmeter and five-way connectionThe air outlet of the CO gas storage cylinder is communicated with an inlet pipeline of a CO electromagnetic valve, and the CO gas storage cylinder is connected with an air exhaust fan 2 Gas outlet of gas storage cylinder and CO 2 Inlet pipe communication of electromagnetic valve, C 3 H 8 Gas outlet and C of gas bomb 3 H 8 An inlet pipeline of the electromagnetic valve is communicated, and an air outlet of the NO gas storage bottle is communicated with an inlet pipeline of the NO electromagnetic valve; the CO electromagnetic valve and CO 2 Electromagnetic valve, C 3 H 8 The outlets of the electromagnetic valve and the NO electromagnetic valve are respectively connected with the CO inlet and the CO of the five-way connecting piece 2 Inlet, C 3 H 8 The connecting device comprises an inlet and an NO inlet, wherein the total outlet of the five-way connecting piece is communicated with a standard gas flowmeter, the standard gas flowmeter is communicated with an air inlet nozzle through a total air inlet pipeline, an air exhaust fan is communicated with an air outlet nozzle through an air exhaust pipeline, and an oxygen concentration sensor is arranged on the air exhaust pipeline.
After the technical scheme is adopted, the invention has the effects that: 1. the left valve plate and the right valve plate of the auxiliary calibration device are driven to deflect by the linear synchronous opening and closing power device, so that the left valve plate and the right valve plate are both synchronously deflected, the deflection accuracy is high, the synchronism is strong, and meanwhile, the linear synchronous opening and closing power device is used for driving to replace a motor, so that the requirement for more rapid opening can be met, the static detection can be met, and the dynamic detection can also be suitable for dynamic detection; 2. a CO gas storage bottle and CO are arranged in the case of the auxiliary calibration device 2 Gas bomb, C 3 H 8 The gas storage bottle and the NO gas storage bottle can control the flow through the corresponding electromagnetic valves, so that the standard gases in different proportions can be accurately regulated, more calibration data can be obtained conveniently during calibration, and the calibration accuracy is higher.
As a preferable scheme, the linear synchronous opening and closing power device comprises a driving slider slidably mounted between a left side plate and a right side plate, a driving rack is arranged on the driving slider, the left valve plate and the right valve plate are fixed on a synchronizing shaft, the synchronizing shaft is rotatably mounted on the left side plate and the right side plate, a driving gear meshed with the driving rack is fixed on the synchronizing shaft, the driving slider is driven by an opening and closing cylinder, the linear synchronous opening and closing power device drives the driving gear on the synchronizing shaft to rotate by utilizing the linear sliding of the driving rack, so as to drive the synchronizing shaft to rotate, the driving mode can realize very quick driving, the starting and the stopping are quick, the opening within 0.5s can be detected dynamically, the driving rack can also be driven slowly by the opening and closing cylinder, the driving of the left valve plate and the right valve plate can be realized, the slow opening of the left valve plate and the right valve plate can reduce the disturbance to the gas in the chamber body, the balanced state can be ensured as much as possible, and the deflection angle of the left valve plate and the right valve plate can be controlled very easily.
As an optimal scheme, left side seal structure is the same with right seal structure, left side seal structure includes left annular gasbag and left annular cover, left side annular cover is fixed in the outside of left side board and overlaps in the periphery of left opening, be provided with open-ended left ring channel on the annular cover of a left side, the opening of left side ring channel is close to one side of cavity body, left side annular gasbag set up in be used for the extrusion in the ring channel of a left side left valve plate, be provided with the sealed air cock with left annular gasbag intercommunication on the ring channel of a left side, consequently, through this structure, utilize left annular gasbag and right annular gasbag just can be better the sealing force of control left valve plate and right valve plate, both can guarantee the smooth and easy degree of opening of left valve plate and right valve plate like this, can also have good leakproofness simultaneously.
As an optimal scheme, be provided with respectively on left side board and the right side board and hold the left heavy groove and the right heavy groove of the left side valve plate and right valve plate, left side valve plate and right valve plate set up in heavy inslot of a left side and the right side sink, the outside of left side board and right side board is fixed with sinks groove and the right heavy closed left limiting plate and right limiting plate of groove with a left side, all be provided with the left side on left side limiting plate and the right limiting plate and dodge the hole with the right side, the hole is dodged to the left side and is corresponded with left opening position, the hole is dodged to the right side and is corresponded with right opening position, through foretell structure like this, left valve plate and right valve plate can sink the inslot smoothly deflecting in a left side and the right side, and left limiting plate and right limiting plate are then extruded by left annular gasbag and right annular gasbag simultaneously to make left valve plate and right valve plate reliably seal with left opening and right opening, it is more smooth and easy to deflect simultaneously left valve plate and right valve plate not direct and left annular gasbag and right opening.
As a preferred scheme, air leakage holes are formed in the left limiting plate and the right limiting plate. Left valve plate and right valve plate are at the in-process that deflects like this, and the gas in the heavy groove of left side and the heavy groove of right side can in time be followed the hole of losing heart and discharge, can effectively avoid like this because the inner space reduces and leads to the atmospheric pressure increase and hinder the condition of opening of left valve plate and right valve plate.
Preferably, the base is mounted outside the cabinet through a height adjusting mechanism, so that the position of the base, and thus the position of the chamber body, can be changed through the height adjusting mechanism to ensure that the base is in the optical path.
As a preferred scheme, the auxiliary calibration device further comprises a combustion dust generating device which generates flue gas containing particulate matters through incomplete combustion, a dust outlet of the combustion dust generating device is communicated with an air inlet nozzle on the chamber body through a dust generating pipeline, and a dust concentration detection instrument is arranged on the dust generating pipeline. This supplementary calibrating device can send out the dirt device through the burning and produce the flue gas like this, and this flue gas has simulated the tail gas that the incomplete combustion of car produced, and this kind of flue gas enters into the cavity originally internally through a dirt mouth discharge, just can examine the standard content of particulate matter in the flue gas that sends through a standard and through calibrated dust concentration detection instrument, and the convenient testing result with tail gas detection system compares, convenient calibration.
As a preferred scheme, the combustion dust-generating device comprises a box body, a combustion chamber is fixed on the box body, the upper end of the combustion chamber is open, an upper plug driven by a lifting power device is vertically and slidably mounted on the box body, the upper plug is in sealed fit with the upper end opening of the combustion chamber, a combustion head is fixed on the upper plug, the combustion head is respectively communicated with a gas inlet connector and a combustion air inlet connector, the gas inlet connector is communicated with a gas quantitative supply system, the combustion air inlet connector is communicated with a compressed air quantitative supply system, the bottom of the combustion chamber is provided with a dust outlet and a blowing port, and the blowing port is located in the box body and is communicated with a quantitative blowing pipeline. The combustion head of the combustion dust-generating device is arranged downwards, and flame is upward when general flame is combusted, so that the flame is downward when the combustion head is inverted, the length of the flame can be further shortened, more gas is incompletely combusted, more particles are generated under the condition of the same using amount of the gas, and the gas consumption is less when the gas with the specified particle concentration is required.
As a preferable scheme, the gas quantitative supply system comprises a gas storage cylinder and a gas flowmeter, wherein the gas storage cylinder is C in the case 3 H 8 The gas storage bottle is characterized in that an outlet of the gas storage bottle is communicated with an inlet of a gas flowmeter, a gas path adapter is fixed outside the box body, and is provided with a first gas inlet joint, a first gas outlet joint, a second gas inlet joint, a second gas outlet joint, a third gas inlet joint, a third gas outlet joint, a fourth gas inlet joint and a fourth gas outlet joint which are communicated in a one-to-one correspondence manner; the outlet of the gas flowmeter is communicated with a first gas inlet joint, and the first gas outlet joint is communicated with a gas inlet joint through a pipeline;
compressed air ration supply system is including providing aerodynamic's compressor blower, compressor blower's gas outlet and the entry end intercommunication of the four-way connection on being fixed in the box, the first exit end and the second exit end of four-way connection communicate with first air flow meter's entry and second air flow meter's entry respectively, first air flow meter and sweep mouthful intercommunication and constitute the ration pipeline of sweeping, second air flow meter's export and second air inlet joint intercommunication, the second is given vent to anger and is connected through pipeline and combustion-supporting air inlet joint intercommunication, lift power device is the lift cylinder, be fixed with the control valve of control lift cylinder action on the box, be provided with air inlet control mouth, first air outlet control mouth and second air outlet control mouth on the control valve, the third exit end of four-way connection communicates through the air inlet control mouth of pipeline and control valve, first air outlet control mouth and second air outlet control mouth communicate with the third air inlet joint and the fourth air inlet joint of gas circuit adapter respectively, the third air outlet joint and the fourth air outlet joint respectively with two control air faucets on the lift cylinder intercommunication.
In order to solve the second technical problem, the technical scheme of the invention is as follows: the auxiliary calibration method of the automobile exhaust detection system comprises the steps that the auxiliary calibration device is placed in a light path of the exhaust detection system in a detection site, and the light path of the exhaust detection system penetrates through a chamber body from a left port and a right port;
1. the gas static calibration method comprises the following steps:
s11, closing the chamber body by the left valve plate and the right valve plate, exhausting and evacuating the chamber body by the air exhaust fan through the air exhaust pipeline, and in the air exhaust process, using the CO electromagnetic valve and the CO to exhaust 2 Electromagnetic valve, C 3 H 8 The electromagnetic valve and the NO electromagnetic valve are respectively opened according to a set flow proportion, pass through the standard gas flowmeter and then enter the chamber body to form standard gas; in the process, the oxygen concentration sensor continuously detects the content in the extraction pipeline, and when the mole fraction of oxygen is less than 0.1%, the extraction is stopped;
s12, CO electromagnetic valve and CO 2 Electromagnetic valve, C 3 H 8 The electromagnetic valve and the NO electromagnetic valve continuously introduce corresponding gas into the cavity body according to the set flow, and when the gas pressure in the cavity body is equal to the external atmospheric pressure, the gas introduction is stopped;
s13, the left valve plate and the right valve plate deflect to open the chamber body, the light path of the tail gas detection system penetrates through the chamber body to carry out component detection on the standard gas in the chamber body, and CO detected for the first time are obtained 2 、C 3 H 8 And the mole fraction of NO is
；
S14, repeating the steps S11 to S13 to respectively obtain CO and CO detected for the second time 2 、C 3 H 8 And mole fraction of NO
And CO detected for the third time 2 、C 3 H 8 And of NO
；
S15, calculating CO and CO respectively 2 、C 3 H 8 And a static absolute indication error and a static relative indication error of NO;
the calculation formula of the static absolute indicating value error is as follows:
wherein,
are respectively CO and CO 2 、C 3 H 8 And of NO
The error of the absolute indication value is obtained,
respectively CO and CO in the standard gas 2 、C 3 H 8 And the mole fraction of NO;
the calculation formula of the static relative indicating value error is as follows:
wherein
Are respectively CO and CO 2 、C 3 H 8 And NO relative indication error; when the temperature is higher than the set temperature
And
when the detected values are all less than or equal to the corresponding maximum set error value, the detected values of the exhaust gas detection system are accurate without calibration, and when the detected values are all less than or equal to the corresponding maximum set error value, the detected values of the exhaust gas detection system are accurate without calibration
And
when any one or more values are larger than the corresponding maximum set error value, adjusting the static compensation coefficient of the corresponding gas in the tail gas detection system, repeating the steps to verify again after the static compensation coefficient of the corresponding gas is adjusted
And
；
2. the gas dynamic calibration method comprises the following steps:
s21, the chamber body is closed by the left valve plate and the right valve plate, the air exhaust fan exhausts the chamber body through the exhaust pipeline, and in the air exhaust process, the CO electromagnetic valve and the CO are connected 2 Electromagnetic valve, C 3 H 8 The electromagnetic valve and the NO electromagnetic valve are respectively opened and mixed according to a set flow proportion to form standard gas, and the standard gas enters the cavity body at the flow rate of 20L/min; in the process, the oxygen concentration sensor continuously detects the content in the extraction pipeline, and when the mole fraction of oxygen is less than 0.1%, the extraction is stopped;
s22, CO electromagnetic valve and CO 2 Electromagnetic valve, C 3 H 8 The electromagnetic valve and the NO electromagnetic valve are continuously opened, the standard gas is continuously introduced into the cavity body at the flow rate of 20L/min, and when the gas pressure in the cavity body is equal to the external atmospheric pressure, the gas introduction is stopped;
s23, CO electromagnetic valve and CO 2 Electromagnetic valve, C 3 H 8 The electromagnetic valve and the NO electromagnetic valve are opened simultaneously, the standard gas is sprayed into the chamber body at the flow rate of 20L/min, meanwhile, the linear synchronous opening and closing power device drives the left valve plate and the right valve plate to be opened within 0.5s, the light path of the tail gas detection system penetrates through the chamber body to carry out component detection on the standard gas, and CO detected for the first time are obtained 2 、C 3 H 8 And the mole fraction of NO is
；
S24, repeating the steps S21 to S23 to respectively obtain CO and CO detected for the second time 2 、C 3 H 8 And mole fraction of NO
And CO detected for the third time 2 、C 3 H 8 And mole fraction of NO
；
S25, respectively calculating CO and CO according to the same calculation mode as the step S15 2 、C 3 H 8 Error of dynamic relative indication of NO
(ii) a When the temperature is higher than the set temperature
When the detected values are all less than or equal to the corresponding maximum set error value, the detected values of the exhaust gas detection system are accurate without calibration, and when the detected values are all less than or equal to the corresponding maximum set error value, the detected values of the exhaust gas detection system are accurate without calibration
When any one or more values are larger than the corresponding maximum set error value, the dynamic compensation coefficient of the corresponding gas in the tail gas detection system is adjusted, and after the dynamic compensation coefficient of the corresponding gas is adjusted, the steps are repeated to verify again
；
3. The particulate matter calibration method comprises the following steps:
s31, the chamber body is closed by the left valve plate and the right valve plate, the air exhaust fan exhausts the chamber body through the air exhaust pipeline, and in the air exhaust process, the CO electromagnetic valve and the CO are used for exhausting 2 Electromagnetic valve, C 3 H 8 Closing the electromagnetic valve and the NO electromagnetic valve, continuously detecting the content in the air extraction pipeline by the oxygen concentration sensor in the process, and stopping air extraction when the mole fraction of the oxygen is less than 0.1%;
s32, the combustion dust generating device sweeps smoke containing particles generated by incomplete combustion into the cavity body from the dust outlet, and when the gas pressure in the cavity body is equal to the external atmospheric pressure, ventilation is stopped;
s33, the linear synchronous opening and closing power device drives the left valve plate and the right valve plate to be opened, the dust generation pipeline continuously sweeps smoke into the cavity body, and when the flow of the dust generation pipeline reaches a set flow, the dust concentration detection instrument reads out the standard dust concentration M in the current dust generation pipeline Label 1 (ii) a Meanwhile, the light path of the tail gas detection system passes through the chamber body to test the concentration of the particulate matters in the flue gas in the chamber body to obtain the test concentration M at the moment Side 1 ；
S34, repeating the steps S31 to S33 twice to obtain the standard dust concentration M Label 2 Standard dust concentration M Label 3 Test concentration M Side 2 Test concentration M Side 3 ；
S35, calculating the absolute indicating value error of dust concentration
，
(ii) a When the absolute value of concentration shows error
When the value is larger than the maximum set error value of the corresponding concentration detection, the dynamic compensation coefficient of the corresponding dust concentration in the tail gas detection system is adjusted, and after the dynamic compensation coefficient of the corresponding dust concentration is adjusted, the steps are repeated to verify again
。
After the technical scheme is adopted, the invention has the effects that: the auxiliary calibration method adopts the auxiliary calibration device and can meet the requirements of a gas static calibration method, a gas dynamic calibration method and a particulate matter calibration method, wherein the content of each gas component of standard gas can be controlled in the gas static calibration method, so that the standard gas with different concentrations can be conveniently configured, meanwhile, the pressure sensor is utilized to detect the air pressure in the chamber body, so that the internal pressure and the external pressure of the chamber body are equal, the opening and closing cylinder drives the driving rack to slowly move, the left valve plate and the right valve plate are slowly opened, the standard gas in the chamber body cannot be disturbed, the requirements of gas static calibration are met, and the calibration precision is higher; in the gas dynamic calibration method, the left valve plate and the right valve plate can be quickly opened, so that in the process of evacuation, each electromagnetic valve is opened and standard gas is introduced into the cavity body at the flow rate of 20L/min, each electromagnetic valve can be adjusted in the process, and sufficient adjusting time is given, so that the final flow rate of the gas can reach 20L/min, and the proportion of each gas component can be ensured to meet the requirement; then when the gas pressure in the cavity body is equal to the external atmospheric pressure, stopping ventilation, then quickly opening the left valve plate and the right valve plate within 0.5s, and simultaneously, continuously and quickly opening each electromagnetic valve according to the previous opening degree, so that the standard sample gas can flow out from 0.5s after rushing into the cavity body, and the dynamic result of each gas component can be tested after the light path of the tail gas detection system is interfered by the sprayed standard sample gas, thereby facilitating the dynamic calibration of the gas; in addition, the auxiliary calibration method can also calibrate the particulate matters, the particulate matters are generated by the combustion dust generating device, and the generated smoke containing the particulate matters is more similar to automobile exhaust, so that the calibration is more accurate.
Drawings
The invention is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a schematic diagram of a front view of an auxiliary alignment device disposed in an optical path according to an embodiment of the present invention;
FIG. 2 is a perspective view of the chassis and calibration chamber assembly;
FIG. 3 is a schematic diagram of the internal structure of the case with the external panel hidden;
FIG. 4 is a perspective view of the calibration chamber assembly;
FIG. 5 is a schematic front view of a calibration chamber assembly;
FIG. 6 is a schematic structural view of the left and right stopper plates hidden;
FIG. 7 isbase:Sub>A cross-sectional view at A-A of FIG. 5;
FIG. 8 is an enlarged schematic view of FIG. 7 at B;
FIG. 9 is a perspective view of a combustion dusting apparatus;
FIG. 10 is a perspective view of another angle of the combustion dusting apparatus;
FIG. 11 is a schematic view of the internal structure of the combustion dust-generating device with the housing hidden;
FIG. 12 is a schematic view of another angle of the internal structure of the combustion dust generating device with the housing concealed;
in the drawings: 1. a chassis; 11. an upper chamber; 12. a partition plate; 13. a CO gas storage cylinder; 14. CO 2 2 A gas storage cylinder; 15. c 3 H 8 A gas cylinder; 16. a NO gas cylinder; 17. A CO solenoid valve; 18. CO 2 2 An electromagnetic valve; 19. c 3 H 8 An electromagnetic valve; 110. a NO solenoid valve; 111. a standard gas flowmeter; 112. an air extractor fan; 113. a five-way connector;
2. calibrating the chamber assembly; 21. a base; 22. a chamber body; 23. a left side plate; 24. a right side plate; 25. a synchronizing shaft; 26. a drive rack; 27. opening and closing the air cylinder; 28. a left limit plate; 29. a left valve plate; 210. a left sink tank; 211. an air inlet nozzle; 212. an air outlet nozzle; 213. a left annular sleeve; 214. a left annular air bag; 215. sealing the air faucet; 216. adjusting a hand wheel; 217. A drive gear; 218. an air release hole;
3. a combustion dust generating device; 31. a box body; 32. an upper plug; 33. a lifting cylinder; 34. a burner head; 35. a combustion chamber; 36. A control valve; 361. a first air outlet control port; 362. a second air outlet control port; 363. an air inlet control port; 37. A gas flow meter; 38. a first air flow meter; 39. a second air flow meter; 310. a gas path adapter; 3101. a first air intake joint; 3102. a first air outlet joint; 3103. a second air intake joint; 3104. a second air outlet joint; 3105. a third air inlet joint; 3106. a third air outlet joint; 3107. a fourth air intake joint; 3108. a fourth air outlet joint; 311. a four-way joint; 3111. an inlet end; 3112. a first outlet end; 3113. a second outlet end; 3114. a third outlet end; 312. a dust outlet; 313. a gas inlet joint; 314. a combustion air inlet joint; 315. and a purge port.
Detailed Description
The present invention is described in further detail below by way of specific examples.
As shown in fig. 1 to 12, an auxiliary calibration device for an automobile exhaust detection system includes a chassis 1, a calibration chamber assembly 2 is installed outside the chassis 1, the calibration chamber assembly 2 includes a base 21, and the base 21 is installed outside the chassis 1 through a height adjustment mechanism, so that the position of the base 21 can be changed through the height adjustment mechanism, and then the position of a chamber body 22 is changed, and it is ensured that the chamber body is located in a light path. The height adjusting mechanism comprises a lead screw nut mechanism, an adjusting seat is fixed on the case 1, a lead screw of the lead screw nut mechanism is rotatably installed on the adjusting seat, a nut of the lead screw nut mechanism is fixed on the base 21, and an adjusting hand wheel 216 is arranged at the upper end of the lead screw or is in transmission connection with an adjusting motor. And the base 21 is slidably mounted on the outside of the cabinet 1 by two vertical guide rods.
A chamber body 22 is fixed on the base 21 through a left side plate 23 and a right side plate 24, the chamber body 22 is a cylindrical chamber body 22, and an outer casing is further arranged on the base 21 outside the chamber body 22; the cavity body 22 is provided with a left through hole and a right through hole which are coaxially arranged, the outer sides of the left through hole and the right through hole on the left side plate 23 and the right side plate 24 are respectively provided with a left valve plate 29 and a right valve plate in a swinging mode, the left valve plate 29 and the right valve plate are both in transmission connection with a linear synchronous opening and closing power device, and the left valve plate 29 is in sealing fit with the edge of the left through hole through a left sealing structure; the right valve plate is in sealing fit with the opening edge of the right opening through a right sealing structure, and the cavity body 22 is provided with an air inlet nozzle 211, an air outlet nozzle 212 and a pressure sensor.
In this embodiment, as shown in fig. 4 and fig. 6, the linear synchronous opening and closing power device includes a driving slider slidably mounted between the left side plate 23 and the right side plate 24, the driving slider is provided with a driving rack 26, the driving rack 26 is disposed obliquely, the left valve plate 29 and the right valve plate are both fixed on a synchronizing shaft 25, the synchronizing shaft 25 is rotatably mounted on the left side plate 23 and the right side plate 24, the synchronizing shaft 25 is fixed with a driving gear 217 engaged with the driving rack 26, the driving slider is driven by the opening and closing cylinder 27, the linear synchronous opening and closing power device drives the driving gear 217 on the synchronizing shaft 25 to rotate by utilizing the linear sliding of the driving rack 26, so as to drive the synchronizing shaft 25 to rotate, the driving mode can realize very fast driving, the starting and stopping are both fast, and the opening within 0.5s can be dynamically detected. Of course, the driving rack 26 can also be driven slowly by the opening and closing cylinder 27, and the stretching speed of the piston rod of the opening and closing cylinder 27 can be completed only by controlling the driving air source of the opening and closing cylinder 27, so that the left valve plate 29 and the right valve plate can be opened quickly or slowly, and thus, when static gas calibration is performed, the left valve plate 29 and the right valve plate are opened slowly, disturbance to the gas inside the chamber body 22 is reduced, a balance state is ensured as far as possible, and meanwhile, the deflection angle of the left valve plate 29 and the right valve plate can be controlled directly and accurately by the stretching length of the piston rod of the opening and closing cylinder 27.
In this embodiment, as shown in fig. 5, fig. 7 and fig. 8, the left sealing structure and the right sealing structure are the same, the left sealing structure includes a left annular airbag 214 and a left annular sleeve 213, the left annular sleeve 213 is fixed outside the left side plate 23 and is sleeved on the periphery of the left through hole, the left annular sleeve 213 is provided with a left annular groove having an opening, the opening of the left annular groove is close to one side of the cavity body, the left annular airbag 214 is disposed in the left annular groove for pressing the left valve plate 29, and the left annular groove is provided with a sealing air tap 215 communicated with the left annular airbag 214.
And further optimize in this embodiment, be provided with the holding on left side board 23 and the right side board 24 respectively the heavy groove in a left side 210 and the heavy groove in a right side of left side valve plate 29 and right valve plate, left side valve plate 29 and right valve plate set up in heavy groove in a left side 210 and the heavy inslot in a right side, the slip of left side valve plate 29 and right valve plate can be more accurate like this, and the outside of left side board 23 and right side board 24 is fixed with and sinks groove 210 and the heavy groove confined left limiting plate 28 in a right side and right limiting plate, all be provided with the left side on left side limiting plate 28 and the right limiting plate and dodge the hole and the right side and dodge the hole, make things convenient for light to pass, the hole is dodged on a left side corresponds with left opening position, the hole is dodged on the right side corresponds with right opening position, like this through foretell structure, left side valve plate 29 and right valve plate can sink the inslot in a left side 210 and the heavy groove and the right side smoothly to deflect, and left limiting plate 28 and right limiting plate are then extruded by left annular gasbag 214 and right annular gasbag to make left side valve plate 29 and right valve plate reliably pass through opening and right through opening contact, and right annular gasbag direct deflection, direct deflection 214.
And air leakage holes 218 are also formed in the left limit plate 28 and the right limit plate. Therefore, in the deflection process of the left valve plate 29 and the right valve plate, the gas in the left sunken groove 210 and the right sunken groove can be discharged from the gas release hole 218 in time, and the situation that the opening of the left valve plate 29 and the right valve plate is blocked due to the increase of the air pressure caused by the reduction of the inner space can be effectively avoided.
As shown in fig. 2 and 3, a partition plate 12 is arranged in the case 1, the case 1 is divided into an upper chamber 11 and a lower chamber by the partition plate 12, and a CO gas cylinder 13 and a CO gas cylinder are placed in the lower chamber 2 Gas storage cylinder 14, C 3 H 8 Gas cylinder 15, NO gas cylinder 16; a CO electromagnetic valve 17 and CO are fixed in the upper chamber 11 2 Solenoid valve 18, C 3 H 8 An electromagnetic valve 19, a NO electromagnetic valve 110, a standard gas flowmeter 111, a five-way connecting piece 113 and an air extractor 112, wherein the air outlet of the CO gas storage bottle 13 is communicated with the inlet pipeline of the CO electromagnetic valve, and the CO gas storage bottle is communicated with the inlet pipeline of the CO electromagnetic valve 2 Gas outlet and CO of gas storage cylinder 2 Inlet pipe communication of electromagnetic valve, C 3 H 8 Gas outlet and C of gas cylinder 15 3 H 8 The inlet pipeline of the electromagnetic valve 19 is communicated, and the gas outlet of the NO gas storage cylinder is communicated with the inlet pipeline of the NO electromagnetic valve 110; the CO electromagnetic valve 17, CO 2 Solenoid valve 18, C 3 H 8 The outlets of the solenoid valve 19 and the NO solenoid valve 110 are respectively fiveCO inlet, CO of the through connection 113 2 Inlet, C 3 H 8 The inlet and the NO inlet are communicated, the total outlet of the five-way connecting piece 113 is communicated with a standard gas flowmeter 111, the standard gas flowmeter 111 is communicated with an air inlet nozzle 211 through a total air inlet pipeline, the air exhaust fan 112 is communicated with an air outlet nozzle 212 through an air exhaust pipeline, and an oxygen concentration sensor is arranged on the air exhaust pipeline.
In the embodiment, the pipeline is omitted in the figures, and the connection of the pipeline is the conventional structure at present.
As shown in fig. 9 to 12, the auxiliary calibration device further includes a combustion dust-generating device 3 generating flue gas containing particulate matters through incomplete combustion, a dust outlet 312 of the combustion dust-generating device 3 is communicated with the air inlet 211 on the chamber body 22 through a dust-generating pipe, and a dust concentration detecting instrument is arranged on the dust-generating pipe, and is of a conventional structure at present, for example, the dust concentration detecting instrument described in CN201910373520 may be selected. This supplementary calibrating device can send out dust device 3 through the burning and produce the flue gas like this, and this flue gas has simulated the tail gas that the incomplete combustion of car produced, and this kind of flue gas just can examine the standard content of particulate matter in the flue gas that sends through a standard and through the dust concentration detection instrument of calibration in entering into cavity body 22 through a dirt mouth 312 discharge, and the convenient testing result with tail gas detection system compares, convenient calibration.
In this embodiment, the combustion dust-generating device 3 includes a box 31, a combustion chamber 35 is fixed on the box 31, an upper opening of the combustion chamber 35 is provided, an upper plug 32 driven by a lifting power device is vertically and slidably mounted on the box 31, the upper plug 32 is in sealing fit with the upper opening of the combustion chamber 35, the lifting power device employs a lifting cylinder 33, a combustion head 34 is fixed on the upper plug 32, the combustion head 34 is respectively communicated with a gas inlet joint 313 and a combustion air inlet joint 314, the gas inlet joint 313 is communicated with a gas quantitative supply system, the combustion air inlet joint 314 is communicated with a compressed air quantitative supply system, the bottom of the combustion chamber 35 is provided with a dust outlet 312 and a purging port 315, and the purging port 315 is located in the box 31 and is communicated with a quantitative purging pipeline.
The combustion head 34 of the combustion dust generating device 3 is arranged downwards, and flame can be upwards during combustion of general flame, so that the flame is downwards arranged by inverting the combustion head 34, the length of the flame can be further shortened, more incomplete combustion of the gas can be realized, more particles can be generated under the condition of the same gas usage amount, and the gas consumption is less when the gas with the specified particle concentration needs to be reached.
In this embodiment, the gas quantitative supply system includes a gas cylinder and a gas flowmeter 37, the gas cylinder is C in the case 1 3 H 8 Gas cylinder 15 so that C can be utilized 3 H 8 As fuel, an outlet of the gas cylinder is communicated with an inlet of a gas flowmeter 37, a gas path adapter 310 is fixed outside the box body 31, a first gas inlet joint 3101 and a first gas outlet joint 3102, a second gas inlet joint 3103 and a second gas outlet joint 3104, a third gas inlet joint 3105 and a third gas outlet joint 3106, a fourth gas inlet joint 3107 and a fourth gas outlet joint 3108 which are communicated in a one-to-one correspondence manner are arranged on the gas path adapter 310, the first gas inlet joint 3101, the second gas inlet joint 3103, the third gas inlet joint 3105 and the fourth gas inlet joint 3107 are positioned inside the box body 31, and the first gas outlet joint 3102, the second gas outlet joint 3104, the third gas outlet joint 3106 and the fourth gas outlet joint 3108 are positioned outside the box body 31; the outlet of the gas flowmeter 37 is communicated with a first gas inlet joint 3101, and the first gas outlet joint 3102 is communicated with a gas inlet joint 313 through a pipeline; thus C 3 H 8 The gas in the gas storage cylinder passes through the gas flow meter 37 and then is metered in through the first gas inlet connector 3101, and is discharged from the first gas outlet connector 3102 and finally enters the combustion head 34 through the gas inlet connector 313 for combustion.
The compressed air quantitative supply system comprises a compressed air fan for providing air power, an air outlet of the compressed air fan is communicated with an inlet end 3111 of a four-way joint 311 fixed on a box body 31, a first outlet end 3112 and a second outlet end 3113 of the four-way joint 311 are respectively communicated with an inlet of a first air flow meter 38 and an inlet of a second air flow meter 39, the first air flow meter 38 is communicated with a blowing port 315 to form the quantitative blowing pipeline, an outlet of the second air flow meter 39 is communicated with a second air inlet joint 3103, a second air outlet joint 3104 is communicated with a combustion air inlet joint 314 through a pipeline, the lifting power device is a lifting cylinder 33, a control valve 36 for controlling the movement of the lifting cylinder 33 is fixed on the box body 31, an air inlet control port 363, a first air outlet control port 361 and a second air outlet control port 362 are arranged on the control valve 36, a third outlet end 3114 of the four-way joint 311 is communicated with the air inlet control port 363 of the control port 36 through a pipeline, the first air outlet control port 361 and the second air outlet control port 362 are respectively communicated with a third air inlet joint 3105 and a fourth air outlet joint 3108 of an air inlet joint 3108 of an air channel 310310, and two air nozzles 3108 on the four-way control port 3103. The first air flow meter 38, the second air flow meter 39 and the gas flow meter 37 are all rotor flow meters, and the flow can be accurately controlled and adjusted.
In addition, the embodiment also discloses an auxiliary calibration method of an automobile exhaust gas detection system, which places the auxiliary calibration device in the optical path of the exhaust gas detection system in the detection field, wherein the exhaust gas detection system is the existing system at present, and the optical path of the exhaust gas detection system penetrates through the chamber body 22 from the left port and the right port, and the auxiliary calibration method includes a gas static calibration method, a gas entity dynamic calibration method and a particulate matter calibration method;
1. the gas static calibration method comprises the following steps:
s11, the chamber body 22 is closed by the left valve plate 29 and the right valve plate, the air exhaust fan 112 exhausts the air of the chamber body 22 through the air exhaust pipeline, and in the air exhaust process, the CO electromagnetic valve 17 and the CO electromagnetic valve 2 Solenoid valve 18, C 3 H 8 The electromagnetic valve 19 and the NO electromagnetic valve 110 are respectively opened according to a set flow ratio, pass through the standard gas flowmeter 111 and enter the chamber body 22 to form standard gas, wherein CO and CO of the standard gas 2 、C 3 H 8 NO concentration has already beenIn the process, the oxygen concentration sensor continuously detects the content in the extraction pipeline, and when the mole fraction of the oxygen is less than 0.1%, the extraction is stopped;
s12, CO electromagnetic valve 17, CO 2 Solenoid valve 18, C 3 H 8 The electromagnetic valve 19 and the NO electromagnetic valve 110 continuously introduce corresponding gas into the chamber body 22 according to a set flow, when the gas pressure in the chamber body 22 is equal to the external atmospheric pressure, the gas introduction is stopped, and the gas pressure in the chamber body 22 is detected by a pressure sensor;
s13, the left valve plate 29 and the right valve plate deflect to open the chamber body 22, the light path of the tail gas detection system penetrates through the chamber body 22 to detect the components of the standard gas in the chamber body 22, and CO detected for the first time are obtained 2 、C 3 H 8 And the mole fraction of NO is
；
S14, repeating the steps S11 to S13 to respectively obtain CO and CO detected for the second time 2 、C 3 H 8 And mole fraction of NO
And CO detected for the third time 2 、C 3 H 8 And of NO
；
S15, calculating CO and CO respectively 2 、C 3 H 8 And a static absolute value error and a static relative value error of NO;
the calculation formula of the static absolute indicating value error is as follows:
wherein,
are respectively CO and CO 2 、C 3 H 8 And of NO
The error of the absolute indication value is obtained,
respectively being CO and CO in standard gas 2 、C 3 H 8 And the mole fraction of NO;
the calculation formula of the static relative indicating value error is as follows:
wherein
Are respectively CO and CO 2 、C 3 H 8 And NO relative indication error; when in use
And
are all less than or equal to the corresponding maximum set error value, the detection values of the exhaust gas detection system are accurate without calibration, such as CO, CO 2 、C 3 H 8 The maximum allowable static set relative error value of NO is +/-10%, and CO 2 Has a static maximum set absolute error value of + -0.25 × 10 -2 ，C 3 H 8 And the maximum absolute error values of NO static state are + -10 × 10 -6 And. + -. 50X 10 -6 When in fact
And
when any one or more values are larger than the corresponding maximum set error value, the static compensation coefficient of the corresponding gas in the tail gas detection system is adjusted, and after the static compensation coefficient of the corresponding gas is adjusted, the steps are repeated to verify again
And
(ii) a Until the error value meets the requirement.
2. The gas dynamic calibration method comprises the following steps:
s21, the left valve plate 29 and the right valve plate close the chamber body 22, and the air exhaust fan 112 passes throughThe pumping pipeline pumps and evacuates the cavity body 22, and in the pumping process, the CO electromagnetic valve 17 and the CO are connected 2 Solenoid valve 18, C 3 H 8 The electromagnetic valve 19 and the NO electromagnetic valve 110 are respectively opened and mixed according to a set flow ratio to form standard gas, each electromagnetic valve controls the ratio and the flow of each gas, and finally the standard gas enters the chamber body 22 at the flow rate of 20L/min; in the process, the oxygen concentration sensor continuously detects the content in the extraction pipeline, and when the mole fraction of oxygen is less than 0.1%, the extraction is stopped;
s22, CO electromagnetic valve 17, CO 2 Solenoid valve 18, C 3 H 8 The electromagnetic valve 19 and the NO electromagnetic valve 110 are continuously opened, the standard gas is continuously introduced into the chamber body 22 at the flow rate of 20L/min, and when the gas pressure in the chamber body 22 is equal to the external atmospheric pressure, the gas introduction is stopped;
s23, CO electromagnetic valve 17, CO 2 Solenoid valve 18, C 3 H 8 The electromagnetic valve 19 and the NO electromagnetic valve 110 are opened simultaneously, the standard gas is sprayed into the chamber body 22 at the flow rate of 20L/min, meanwhile, the linear synchronous opening and closing power device drives the left valve plate 29 and the right valve plate to be opened within 0.5s, the light path of the tail gas detection system penetrates through the chamber body 22 to carry out component detection on the standard gas, and CO detected for the first time are obtained 2 、C 3 H 8 And the mole fraction of NO is
(ii) a Since the standard gas is adjusted and introduced at the flow rate of 20L/min in the steps S21 and S22, the step only needs to be started according to the previous parameters without adjustment, so that the accuracy of the flow rate of the standard gas can be ensured as much as possible.
S24, repeating the steps S21 to S23 to respectively obtain CO and CO detected for the second time 2 、C 3 H 8 And the mole fraction of NO
And CO detected for the third time 2 、C 3 H 8 And mole fraction of NO
；
S25, respectively calculating CO and CO according to the same calculation mode as the step S15 2 、C 3 H 8 Error in dynamic relative indication of NO
(ii) a When the temperature is higher than the set temperature
When the detected values are all less than or equal to the corresponding maximum set error value, the detected values of the tail gas detection system are accurate without calibration, wherein, CO and CO 2 、C 3 H 8 And NO with a dynamic maximum allowable relative indication error of ± 15%. When in
When any one or more values are larger than the corresponding maximum set error value, the dynamic compensation coefficient of the corresponding gas in the tail gas detection system is adjusted, and after the dynamic compensation coefficient of the corresponding gas is adjusted, the steps are repeated to verify again
Until the requirements are met.
3. The particulate matter calibration method comprises the following steps:
s31, the chamber body 22 is closed by the left valve plate 29 and the right valve plate, the air exhaust fan 112 exhausts the air of the chamber body 22 through the air exhaust pipeline, and in the air exhaust process, the CO electromagnetic valve 17 and the CO electromagnetic valve 2 Solenoid valve 18, C 3 H 8 The electromagnetic valve 19 and the NO electromagnetic valve 110 are both closed, the oxygen concentration sensor continuously detects the content in the air extraction pipeline in the process, and the air extraction is stopped when the mole fraction of the oxygen is less than 0.1%;
s32, the combustion dust generating device 3 blows the smoke containing the particles generated by incomplete combustion into the cavity body 22 from the dust outlet 312, and when the gas pressure in the cavity body 22 is equal to the external atmospheric pressure, the ventilation is stopped;
s33, the linear synchronous opening and closing power device drives the left valve plate 29 and the right valve plate to be opened, the dust generation pipeline continuously sweeps smoke into the cavity body 22, and when the flow of the dust generation pipeline reaches a set flow, the dust concentration detection instrument reads the standard dust concentration M in the current dust generation pipeline Label 1 (ii) a Meanwhile, the light path of the tail gas detection system passes through the chamber body 22 to test the concentration of the particulate matters in the flue gas in the chamber body 22 to obtain the test concentration M at the moment Side 1 ；
S34, repeating the steps S31 to S33 for two times to obtain the standard dust concentration M Label 2 Standard dust concentration M Label 3 Test concentration M Side 2 Test concentration M Side 3 ；
S35, calculating the absolute indicating value error of dust concentration
，
(ii) a When the absolute value of concentration shows error
When the value is larger than the maximum set error value of the corresponding concentration detection, the dynamic compensation coefficient of the corresponding dust concentration in the tail gas detection system is adjusted, and after the dynamic compensation coefficient of the corresponding dust concentration is adjusted, the steps are repeated to verify again
。
The auxiliary calibration method adopts the auxiliary calibration device and can meet the requirements of a gas static calibration method, a gas dynamic calibration method and a particulate matter calibration method, wherein the content of each gas component of standard gas can be controlled in the gas static calibration method, so that the standard gas with different concentrations can be conveniently configured, meanwhile, the pressure sensor is utilized to detect the air pressure in the chamber body 22, so that the internal pressure and the external pressure of the chamber body 22 are equal, the opening and closing cylinder 27 drives the driving rack 26 to slowly act, the left valve plate 29 and the right valve plate are slowly opened, the disturbance on the standard gas in the chamber body 22 is avoided, the requirement of gas static calibration is met, and the calibration precision is higher; in the gas dynamic calibration method, the left valve plate 29 and the right valve plate can be quickly opened, so that in the process of evacuation, each electromagnetic valve is opened and standard gas is introduced into the chamber body 22 at the flow rate of 20L/min, and each electromagnetic valve can be adjusted in the process, so that enough adjusting time is given, the final flow rate of the gas can reach 20L/min, and meanwhile, the proportion of each gas component can be ensured to meet the requirement; then when the gas pressure in the chamber body 22 is equal to the external atmospheric pressure, stopping ventilation, then rapidly opening the left valve plate 29 and the right valve plate within 0.5s, and simultaneously, rapidly opening each electromagnetic valve continuously according to the previous opening degree, so that the standard sample gas can be sprayed out from 0.5s after rushing into the chamber body 22, and the dynamic result of each gas component can be tested after the light path of the tail gas detection system is interfered by the sprayed standard sample gas, thereby facilitating the dynamic calibration of the gas; in addition, the auxiliary calibration method can also calibrate the particles, the particles are generated by the combustion dust generating device 3, and the generated smoke containing the particles is more similar to the automobile exhaust, so that the calibration is more accurate.
The air path system, the gear rack transmission mechanism and the lead screw nut mechanism mentioned in the embodiment are all conventional technologies at present, specific structures and principles of an air cylinder, a motor and other transmission mechanisms and other designs are disclosed in detail in a mechanical design manual fifth edition printed in the twenty-eighth fifth edition of Beijing in 4.2008, and belong to the prior art, the structures of the air path system, the gear rack transmission mechanism and the lead screw nut mechanism are clear, a vacuum element, an air loop and program control are disclosed in detail in a modern practical pneumatic technology 3 rd edition SMC teaching material published by a mechanical industry publisher in 08.01.2008, the air path structure in the embodiment is also the prior art, the control and the travel switch of the motor are clearly described in detail in a motor driving and speed regulating book published by a chemical industry publisher in 07.01.2015, and therefore, the connection of the electric circuit and the air path is clear. The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and alterations made to the technical solution of the present invention without departing from the spirit of the present invention are intended to fall within the scope of the present invention defined by the claims.
Claims (10)
1. The utility model provides an automobile exhaust detecting system's supplementary calibrating device, includes quick-witted case, its characterized in that: the calibration cavity assembly comprises a base, a cavity body is fixed on the base through a left side plate and a right side plate, a left through hole and a right through hole are formed in the cavity body and are coaxially arranged, a left valve plate and a right valve plate are respectively installed on the outer sides of the left through hole and the right through hole on the left side plate and the right side plate in a swinging mode, the left valve plate and the right valve plate are both in transmission connection with a linear synchronous opening and closing power device, and the left valve plate is in sealing fit with the opening edge of the left through hole through a left sealing structure; the right valve plate is in sealing fit with the opening edge of the right port through a right sealing structure, and the cavity body is provided with an air inlet nozzle, an air outlet nozzle and a pressure sensor;
the machine case is internally provided with a partition plate which divides the machine case into an upper chamber and a lower chamber, and a CO gas storage bottle and a CO gas storage tank are placed in the lower chamber 2 Gas cylinder, C 3 H 8 Gas cylinders, NO gas cylinders; a CO electromagnetic valve and CO are fixed in the upper chamber 2 Electromagnetic valve, C 3 H 8 The gas outlet of the CO gas storage bottle is communicated with an inlet pipeline of the CO electromagnetic valve, and the CO gas is discharged from the gas outlet of the CO gas storage bottle 2 Gas outlet and CO of gas storage cylinder 2 Inlet pipe communication of electromagnetic valve, C 3 H 8 Gas outlet and C of gas storage cylinder 3 H 8 The inlet pipeline of the electromagnetic valve is communicated, and the gas outlet of the NO gas storage bottle is communicated with the inlet pipeline of the NO electromagnetic valve; the CO electromagnetic valve and CO 2 Electromagnetic valve, C 3 H 8 The outlets of the electromagnetic valve and the NO electromagnetic valve are respectively connected with the CO inlet and the CO of the five-way connecting piece 2 Inlet, C 3 H 8 The inlet and the NO inlet are communicated, and the total outlet of the five-way connecting piece is connected with a standard gas flowmeterThe standard gas flowmeter is communicated with the air inlet nozzle through a main air inlet pipeline, the air exhaust fan is communicated with the air outlet nozzle through an air exhaust pipeline, and an oxygen concentration sensor is arranged on the air exhaust pipeline.
2. The auxiliary calibration device for an automobile exhaust gas detection system according to claim 1, wherein: the linear synchronous opening and closing power device comprises a driving sliding block which is slidably mounted between a left side plate and a right side plate, a driving rack is arranged on the driving sliding block, the left valve plate and the right valve plate are fixed on a synchronizing shaft, the synchronizing shaft is rotatably mounted on the left side plate and the right side plate, a driving gear meshed with the driving rack is fixed on the synchronizing shaft, and the driving sliding block is driven by an opening and closing cylinder.
3. An auxiliary calibration device for an automobile exhaust gas detection system according to claim 2, wherein: left side seal structure is the same with right seal structure, left side seal structure includes left annular gasbag and left annular cover, left side annular cover is fixed in the outside of left side board and overlaps the periphery at left opening, be provided with open-ended left ring channel on the annular cover of a left side, the opening of left side ring channel is close to one side of cavity body, left side annular gasbag set up in be used for the extrusion in the ring channel of a left side the left valve plate, be provided with the sealed air cock with left annular gasbag intercommunication on the ring channel of a left side.
4. An auxiliary calibrating device for an automobile exhaust gas detecting system according to claim 3, characterized in that: be provided with respectively on left side board and the right side board and hold the heavy groove in a left side and the heavy groove in the right side of the heavy groove in a left side and right valve plate, left side valve plate and right valve plate set up in the heavy inslot in a left side and the heavy inslot in the right side, the outside of left side board and right side board is fixed with sinks groove and the heavy groove confined left limiting plate in the right side and right limiting plate in a left side, all be provided with on left side limiting plate and the right limiting plate and dodge the hole in the right side, dodge the hole in the left side and correspond with left opening position, the hole is dodged in the right side and corresponds with right opening position.
5. An auxiliary calibration device for an automobile exhaust gas detection system according to claim 4, wherein: and air leakage holes are formed in the left limiting plate and the right limiting plate.
6. An auxiliary calibration device for an automobile exhaust gas detection system according to claim 5, wherein: the base is installed on the outer side of the case through a height adjusting mechanism.
7. An auxiliary calibrating device for an automobile exhaust gas detecting system according to any one of claims 1 to 6, wherein: the auxiliary calibration device further comprises a combustion dust generating device which generates smoke containing particles through incomplete combustion, a dust outlet of the combustion dust generating device is communicated with an air inlet nozzle on the cavity body through a dust generating pipeline, and a dust concentration detection instrument is arranged on the dust generating pipeline.
8. An auxiliary calibration device for an automobile exhaust gas detection system according to claim 7, wherein: the combustion dust generating device comprises a box body, a combustion chamber is fixed on the box body, an upper end opening of the combustion chamber is formed, an upper plug driven by a lifting power device is vertically and slidably mounted on the box body, the upper plug is in sealed fit with the upper end opening of the combustion chamber, a combustion head is fixed on the upper plug, the combustion head is communicated with a gas inlet connector and a combustion-supporting air inlet connector respectively, the gas inlet connector is communicated with a gas quantitative supply system, the combustion-supporting air inlet connector is communicated with a compressed air quantitative supply system, a dust outlet and a blowing port are formed in the bottom of the combustion chamber, and the blowing port is located in the box body and communicated with a quantitative blowing pipeline.
9. An auxiliary calibration device for an automobile exhaust gas detection system according to claim 8, wherein: the gas quantitative supply system comprises a gas storage cylinder and a gas flowmeter, wherein the gas storage cylinder is C in the case 3 H 8 The air storage bottle is provided with an air storage tank,an outlet of the gas storage bottle is communicated with an inlet of a gas flowmeter, a gas path adapter is fixed outside the box body, a first gas inlet joint and a first gas outlet joint, a second gas inlet joint and a second gas outlet joint, a third gas inlet joint and a third gas outlet joint, a fourth gas inlet joint and a fourth gas outlet joint which are communicated in a one-to-one correspondence mode are arranged on the gas path adapter, the first gas inlet joint, the second gas inlet joint, the third gas inlet joint and the fourth gas outlet joint are located inside the box body, and the first gas outlet joint, the second gas outlet joint, the third gas outlet joint and the fourth gas outlet joint are located outside the box body; the outlet of the gas flowmeter is communicated with a first gas inlet joint, and the first gas outlet joint is communicated with a gas inlet joint through a pipeline;
compressed air ration supply system is including providing aerodynamic's compressor fan, compressor fan's gas outlet and the entry end intercommunication that is fixed in the cross-connection joint on the box, the first exit end and the second exit end of cross-connection joint communicate with first air flowmeter's entry and second air flowmeter's entry respectively, first air flowmeter constitutes with sweeping mouthful intercommunication the ration pipeline of sweeping, second air flowmeter's export and second admission joint intercommunication, the second is given vent to anger to connect through pipeline and combustion air admission joint intercommunication, lift power device is the lift cylinder, be fixed with the control valve of control lift cylinder action on the box, be provided with air inlet control mouth, first air outlet control mouth and second air outlet control mouth on the control valve, the third exit end of cross-connection passes through the air inlet control mouth intercommunication of pipeline and control valve, first air outlet control mouth and second air outlet control mouth are given vent to anger respectively with the third admission joint and the fourth admission joint intercommunication of gas circuit adapter, the third air outlet joint and fourth air outlet joint respectively with two control pipeline intercommunications on the lift cylinder.
10. An auxiliary calibration method of an automobile exhaust detection system is characterized in that: the auxiliary calibration method places the auxiliary calibration apparatus according to any one of claims 7 to 9 in the optical path of the exhaust gas detection system at the detection site, so that the optical path of the exhaust gas detection system penetrates through the chamber body from the left port and the right port, and the auxiliary calibration method includes a gas static calibration method, a gas dynamic calibration method and a particulate matter calibration method;
1. the gas static calibration method comprises the following steps:
s11, closing the chamber body by the left valve plate and the right valve plate, exhausting and evacuating the chamber body by the air exhaust fan through the air exhaust pipeline, and in the air exhaust process, using the CO electromagnetic valve and the CO to exhaust 2 Electromagnetic valve, C 3 H 8 The electromagnetic valve and the NO electromagnetic valve are respectively opened according to a set flow proportion, pass through the standard gas flowmeter and then enter the cavity body to form standard gas; in the process, the oxygen concentration sensor continuously detects the content in the extraction pipeline, and when the mole fraction of oxygen is less than 0.1%, the extraction is stopped;
s12, CO electromagnetic valve and CO 2 Electromagnetic valve, C 3 H 8 The electromagnetic valve and the NO electromagnetic valve continuously introduce corresponding gas into the cavity body according to the set flow, and when the gas pressure in the cavity body is equal to the external atmospheric pressure, the gas introduction is stopped;
s13, the left valve plate and the right valve plate deflect to open the chamber body, the light path of the tail gas detection system penetrates through the chamber body to carry out component detection on the standard gas in the chamber body, and CO detected for the first time are obtained 2 、C 3 H 8 And the mole fraction of NO is
；
S14, repeating the steps S11 to S13 to respectively obtain CO and CO detected for the second time 2 、C 3 H 8 And mole fraction of NO
And CO detected for the third time 2 、C 3 H 8 And of NO
；
S15, calculating CO and CO respectively 2 、C 3 H 8 And a static absolute value error and a static relative value error of NO;
the calculation formula of the static absolute indicating value error is as follows:
wherein,
are respectively CO and CO 2 、C 3 H 8 And of NO
The error of the absolute value of the indication value,
respectively CO and CO in the standard gas 2 、C 3 H 8 And the mole fraction of NO;
the calculation formula of the static relative indicating value error is as follows:
wherein
Are respectively CO and CO 2 、C 3 H 8 And NO relative indication error; when in use
And
when the detected values are all less than or equal to the corresponding maximum set error value, the detection values of the exhaust gas detection system are accurate without calibration, and when the detected values are all less than or equal to the corresponding maximum set error value, the detection values of the exhaust gas detection system are accurate without calibration
And
when any one or more values are larger than the corresponding maximum set error value, the static compensation coefficient of the corresponding gas in the tail gas detection system is adjusted, and after the static compensation coefficient of the corresponding gas is adjusted, the steps are repeated to verify again
And
；
2. the gas dynamic calibration method comprises the following steps:
s21, closing the chamber body by the left valve plate and the right valve plate, exhausting and evacuating the chamber body by an exhaust fan through an exhaust pipeline, and in the exhaust process, performing CO electromagnetic valve and CO 2 Electromagnetic valve, C 3 H 8 The electromagnetic valve and the NO electromagnetic valve are respectively opened and mixed according to a set flow proportion to form standard gas, and the standard gas enters the cavity body at the flow rate of 20L/min; in the process, the oxygen concentration sensor continuously detects the content in the extraction pipeline, and when the mole fraction of oxygen is less than 0.1%, the extraction is stopped;
s22, a CO electromagnetic valve and CO 2 Electromagnetic valve, C 3 H 8 The electromagnetic valve and the NO electromagnetic valve are continuously opened, the standard gas is continuously introduced into the cavity body at the flow rate of 20L/min, and when the gas pressure in the cavity body is equal to the external atmospheric pressure, the gas introduction is stopped;
s23, CO electromagnetic valve and CO 2 Electromagnetic valve, C 3 H 8 The electromagnetic valve and the NO electromagnetic valve are opened simultaneously, the standard gas is sprayed into the chamber body at the flow rate of 20L/min, meanwhile, the linear synchronous opening and closing power device drives the left valve plate and the right valve plate to be opened within 0.5s, the light path of the tail gas detection system penetrates through the chamber body to carry out component detection on the standard gas, and CO detected for the first time are obtained 2 、C 3 H 8 And the mole fraction of NO is
；
S24, repeating the steps S21 to S23 to respectively obtain CO and CO detected for the second time 2 、C 3 H 8 And mole fraction of NO
And CO detected for the third time 2 、C 3 H 8 And the mole fraction of NO
；
S25, calculating CO and CO respectively according to the same calculation mode as the step S15 2 、C 3 H 8 Error of dynamic relative indication of NO
(ii) a When the temperature is higher than the set temperature
And
when the detected values are all less than or equal to the corresponding maximum set error value, the detection values of the exhaust gas detection system are accurate without calibration, and when the detected values are all less than or equal to the corresponding maximum set error value, the detection values of the exhaust gas detection system are accurate without calibration
And
when any one or more values are larger than the corresponding maximum set error value, the dynamic compensation coefficient of the corresponding gas in the tail gas detection system is adjusted, and after the dynamic compensation coefficient of the corresponding gas is adjusted, the steps are repeated to verify again
And
；
3. a particulate calibration method, comprising the steps of:
s31, the chamber body is closed by the left valve plate and the right valve plate, the air exhaust fan exhausts the chamber body through the air exhaust pipeline, and in the air exhaust process, the CO electromagnetic valve and the CO are used for exhausting 2 Electromagnetic valve, C 3 H 8 The electromagnetic valve and the NO electromagnetic valve are both closed, and the oxygen concentration sensor continuously detects the content in the air pumping pipeline in the process when the mole fraction of the oxygen isStopping air extraction when the concentration is less than 0.1%;
s32, the combustion dust generating device sweeps the smoke containing the particles generated by incomplete combustion into the cavity body from the dust outlet, and when the gas pressure in the cavity body is equal to the external atmospheric pressure, the ventilation is stopped;
s33, the linear synchronous opening and closing power device drives the left valve plate and the right valve plate to be opened, the dust generating pipeline continuously sweeps smoke into the cavity body, and when the flow of the dust generating pipeline reaches a set flow, the dust concentration detection instrument reads out the standard dust concentration M in the current dust generating pipeline Label 1 (ii) a Meanwhile, the light path of the tail gas detection system passes through the chamber body to test the concentration of the particulate matters in the flue gas in the chamber body to obtain the test concentration M at the moment Side 1 ；
S34, repeating the steps S31 to S33 twice to obtain the standard dust concentration M Label 2 Standard dust concentration M Label 3 Test concentration M Side 2 Test concentration M Side 3 ；
S35, calculating the absolute indicating value error of dust concentration
，
(ii) a When the absolute value of concentration shows error
When the value is larger than the maximum set error value of the corresponding concentration detection, the dynamic compensation coefficient of the corresponding dust concentration in the tail gas detection system is adjusted, and after the dynamic compensation coefficient of the corresponding dust concentration is adjusted, the steps are repeated to verify again
。
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