CN102608277A - Detection system and method for oxynitride sensor - Google Patents
Detection system and method for oxynitride sensor Download PDFInfo
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- CN102608277A CN102608277A CN2012101046215A CN201210104621A CN102608277A CN 102608277 A CN102608277 A CN 102608277A CN 2012101046215 A CN2012101046215 A CN 2012101046215A CN 201210104621 A CN201210104621 A CN 201210104621A CN 102608277 A CN102608277 A CN 102608277A
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- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 88
- 238000010438 heat treatment Methods 0.000 claims abstract description 68
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 137
- 238000009434 installation Methods 0.000 claims description 34
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 31
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000002912 waste gas Substances 0.000 claims description 8
- 238000004088 simulation Methods 0.000 abstract description 14
- 238000002474 experimental method Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 229910002089 NOx Inorganic materials 0.000 description 52
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention discloses a detection system and method for an oxynitride sensor. The detection system comprises a tail gas distribution simulation device, a heating device, a silicon controlled rectifier (SCR) detection device, an electric signal test device and a tail gas discharging processing device, wherein the tail gas distribution simulation device is connected with one end of the heating device; and the other end of the heating device is connected in parallel with the SCR detection device, the electric signal test device and the tail gas discharging processing device. The detection system has a simple structure, can perform an experiment with different test requirements on the oxynitride sensor, can detect the real-time working state of the oxynitride sensor and can record relevant data, and can be used for researching and developing the oxynitride sensor; and the problem about exploration of researchers for an oxynitride sensor test carrier is solved.
Description
Technical field
The present invention relates to a kind of detection system and detection method of NOx sensor.
Background technology
Energy-saving and emission-reduction have become the common issue with that current society faces; Various countries are also increasingly high to the requirement of air quality; Automotive emission has become main atmosphere pollution; At present, engine aftertreatment system is measured nitrous oxides concentration in the tail gas with NOx sensor, and takes appropriate measures through the oxides of nitrogen value that NOx sensor gets access to and to reduce the discharging of oxides of nitrogen gas; It is minimum that the content of harmful nitrogen oxide gas in the exhaust emissions is dropped to, and reaches the requirement of reduction of discharging.
At present, lack effective method to how testing NOx sensor, general method is utilized testing laboratory's stand exactly; The place tests the NOx sensor of laying at the exhaust emissions pipeline; But in the bench run process, the fuel oil of labor and needs arrange platform experiment chamber staff to coordinate, and in the bench run process; Can not control accurately the formation of tail gas test gas; In addition because the restriction in experiment place itself makes NOx sensor in depth not test, to this problem; We press for the duty that a kind of efficient system detects NOx sensor, for NOx sensor understood and study in depth use.
Summary of the invention
The detection system and the detection method that the purpose of this invention is to provide a kind of NOx sensor can make things convenient for the researchist NOx sensor in the work to be carried out the research of control strategy and performance test.
For achieving the above object, the technical scheme that the present invention adopts is following:
A kind of NOx sensor detection system; Comprise simulated exhaust gas air distributing device, heating arrangement, SCR (SCR) pick-up unit, electric signal proving installation; The exhaust emissions treating apparatus; The simulated exhaust gas air distributing device links to each other with an end of heating arrangement, and the other end of heating arrangement is parallel with SCR pick-up unit, electric signal proving installation and exhaust emissions treating apparatus
The simulated exhaust gas air distributing device comprises at least two gas-holder that are used to store different simulated exhaust gas, wherein has one to be the nitrogen storage gas tank, and gas-holder is through pressure regulator valve quality of connection flowmeter; Mass flowmeter connects distributing instrument; Distributing instrument connects heating arrangement through the analog gas Open valve, and the nitrogen storage gas tank also is parallel with second pressure regulator valve, is connected with second mass flowmeter and water vapor generation device on second pressure regulator valve in turn; Water vapor generation device also is connected on the analog gas Open valve
The simulated exhaust gas air distributing device also comprises the air inlet device, and the air inlet device comprises the disturbance gas generating unit, and the disturbance gas generating unit connects the disturbance mass-flow gas meter through pressure loading valve, and the disturbance mass-flow gas meter is connected on the heating arrangement.
Heating arrangement comprises heating furnace and test chamber; Test chamber is installed in the heating furnace; Test chamber is provided with air intake opening and gas outlet; The air intake opening of test chamber connects the disturbance mass-flow gas meter and the analog gas Open valve of simulated exhaust gas air distributing device, and the gas outlet of test chamber connects SCR pick-up unit, electric signal proving installation and exhaust emissions treating apparatus
The gas outlet of test chamber is through connecting SCR pick-up unit, electric signal proving installation and exhaust emissions treating apparatus.
The SCR pick-up unit comprises NOx sensor controller connected to one another and SCR control device, and the SCR control device comprises controller and display device.
The electric signal proving installation comprises: the PXI modular testing is measured and control criterion platform and platform display.
The exhaust emissions treating apparatus comprises: vacuum generator, emission-control equipment; The air intake opening of emission-control equipment connects the test chamber of heating arrangement through the waste gas Open valve; Vacuum generator is connected the gas outlet of emission-control equipment through the vacuum generator by-pass valve control, is connected with tail-gas analyzer through gas temperature sensor between the test chamber of heating arrangement and the emission-control equipment.
A kind of detection method of NOx sensor detection system comprises the steps:
(1), tested sensor is placed on behind the test chamber of heating arrangement on the sensor installation site;
(2), the vacuum generator work in the exhaust emissions treating apparatus, extract the test chamber and the residual gas in the connecting tube of heating arrangement clean;
(3), accurately control the tested analog gas that gets into heating furnace (16) burner hearth that adds heating arrangement by the distributing instrument of simulated exhaust gas air distributing device;
(4), the heating furnace burner hearth is provided with heating-up temperature according to testing requirements;
(5), the work of the control of the NOx sensor controller in SCR pick-up unit NOx sensor, the SCR pick-up unit cooperates the simulated exhaust gas air distributing device to measure the content of oxides of nitrogen value, thereby confirms whether operate as normal of NOx sensor;
(6), in NOx sensor work, utilize the PXI modular testing in the electric signal proving installation to measure the electrical signal information that goes out each circuit of NOx sensor with the control criterion platform measuring;
(7), handle the gas of discharging by the emission-control equipment in the exhaust emissions treating apparatus.
NOx sensor detection system of the present invention and detection method have following characteristics:
1. the accurate simulated exhaust gas environment of air distributing device, and gas is delivered to test cavity, testing sensor again through heating;
2. the electric tube furnace that uses of heating arrangement heat efficient and conveniently, and the interior test chamber of electric furnace can improve replacing according to different test requests, and changeability is good;
3, NOx sensor moves through controller, and by the SCR system monitoring, the oxygen content that the sensor that monitors records, amount of nitrogen oxides, the value that obtains with gas distributing system compares, and can know whether the working sensor situation is good;
4, through the PXI platform of NI, can Accurate Analysis handle the electric signal in the NOx sensor work;
5, tail gas process purified treatment is pollution-free.
NOx sensor detection system of the present invention is simple in structure; Can carry out test to the different test requests of NOx sensor; Can test the real-time working state of NOx sensor; And the record related data, can supply the NOx sensor research and development to use, solved researchist's groping to the NOx sensor test carrier.
Description of drawings
Fig. 1 is a detection system structural representation of the present invention;
Fig. 2 is the application synoptic diagram after detection system of the present invention is installed tested sensor;
Fig. 3 is a method of testing FB(flow block) of the present invention.
Among the figure: 1-simulated exhaust gas air distributing device; 2-heating arrangement; 3-SCR pick-up unit; 4-electric signal proving installation; 5-exhaust emissions treating apparatus; 6-gas-holder; 7-pressure regulator valve; 8-mass flowmeter; 9-distributing instrument; 10-water vapor generation device; 12-disturbance gas generating unit; 13-disturbance gas valve; 14-disturbance mass-flow gas meter; 15-analog gas Open valve; 16-heating furnace; 17-test chamber; 18-gas temperature sensor; 19-tail-gas analyzer; 20-NOx sensor controller; 21-SCR control device; 22-electrical signal collection interface; 23-waste gas Open valve; 24-emission-control equipment; 25-vacuum generator by-pass valve control; 26-vacuum generator; 27-sensor installation site; 6A-nitrogen storage gas tank; 7A-second pressure regulator valve; 8A-second mass flowmeter.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing.
A kind of NOx sensor detection system; It is characterized in that: comprise simulated exhaust gas air distributing device 1, heating arrangement 2, SCR pick-up unit 3, electric signal proving installation 4, exhaust emissions treating apparatus 5, simulated exhaust gas air distributing device 1 links to each other with an end of heating arrangement 2; The other end of heating arrangement 2 is parallel with SCR pick-up unit 3, electric signal proving installation 4 and exhaust emissions treating apparatus 5; Simulated exhaust gas air distributing device 1 comprises at least two gas-holder 6 that are used to store different simulated exhaust gas, wherein has one to be nitrogen storage gas tank 6A, and gas-holder 6 is through pressure regulator valve 7 quality of connection flowmeters 8; Mass flowmeter 8 connects distributing instrument 9; Distributing instrument 9 connects heating arrangement through analog gas Open valve 15, and nitrogen storage gas tank 6A also is parallel with the second pressure regulator valve 7A, is connected with the second mass flowmeter 8A and water vapor generation device 10 on the second pressure regulator valve 7A in turn; Water vapor generation device 10 also is connected on the analog gas Open valve 15
Simulated exhaust gas air distributing device 1 also comprises the air inlet device; The air inlet device comprises disturbance gas generating unit 12; Disturbance gas generating unit 12 connects disturbance mass-flow gas meter 14 through disturbance gas valve 13, and disturbance mass-flow gas meter 14 is connected on the heating arrangement.
SCR pick-up unit 3 comprises NOx sensor controller 20 connected to one another and SCR control device 21, and the SCR control device comprises controller and display device.
Electric signal proving installation 4 comprises: the PXI modular testing is measured and control criterion platform and platform display.PXI is the PCI expansion towards instrument system.
Exhaust emissions treating apparatus 5 comprises: vacuum generator 26, emission-control equipment 24; The air intake opening of emission-control equipment 24 connects the test chamber 17 of heating arrangement 2 through waste gas Open valve 23; Vacuum generator 26 is connected the gas outlet of emission-control equipment 24 through vacuum generator by-pass valve control 25, is connected with tail-gas analyzer 19 through gas temperature sensor 18 between the test chamber 17 of heating arrangement and the emission-control equipment 24.
In the simulated exhaust gas air distributing device 1; Nitrogen storage gas tank 6A and peripheral unit comprise water vapor generation device 10; Degree of accuracy is other five groups of distributing instruments 9 of ppm level; Through five groups of distributing instruments 9 and the pressure regulator valve 7 of each minute source of the gas, the common use of mass flowmeter 8, make the tested analog gas Pass Test requirement of final entering heating furnace 16 burner hearths, this is the test simulation gas for preparing.
SCR pick-up unit 3 is connected electrical signal collection interface 22 with the p-wire of electric signal proving installation 4, and when tested sensor is installed in when detecting on the test chamber 17 in the heating arrangement 2, electrical signal collection interface 22 is connected on the signal wire of sensor.
Simulated exhaust gas air distributing device 1 links to each other with heating arrangement 2; Test simulation gas gets into heating arrangement 2 via pipeline and heats; For the tested NOx sensor on the test chamber 17 sensor installation sites 27 detects in the heating arrangement 2 to being installed in, the high temperature that heating arrangement 2 simulated automotives are discharged, the heating of using 16 is electric tube furnace; Temperature can realize automatic adjusting; The benefit of electric tube furnace is that the requirement that can test is different, and design different detection cavity 17 supplies to lay devices such as tail-gas analyzer 19, temperature sensor 18, tested NOx sensor.
SCR pick-up unit 3, electric signal proving installation 4 and tail-gas analyzer 19, temperature sensor 18 are monitored test simulation gas and the NOx sensor that is installed on the sensor installation site 27 simultaneously.
In the SCR supervising device 3; NOx sensor controller 20 is connected through the CAN communication with SCR control device 21; SCR control device 21 is connected with the computer that monitoring software is housed through the LIN communication again; Realized in the testing process that to the monitoring of oxygen in the test chamber 17 and amount of nitrogen oxides, and the value that is provided with five groups of distributing instruments 9 is as comparing foundation.
What electric signal proving installation 4 used is the measurement of PXI modular testing and control criterion platform of U.S. American National instrument company (NI); Voltage, electric current, resistance signal to each circuit of NOx sensor are tested, and its signal degree of accuracy can reach nV, pA, n Ω rank, and each module in the platform can realize synchronism detection; Synchronous error can guarantee the microsecond rank; Can know the real-time electric signal and the changes in resistance situation of NOx sensor heating resistor like this, simultaneously, be provided with analog output module in the platform; Can add some signal changes to sensor; Study,, can realize the measurement of unlike signal and the analysis of data through existing LabVIEW software programming in the platform.
In the system, can add the flow direction that gas valve is controlled test gas in different at different position and different as required.
A kind of detection method of NOx sensor detection system comprises the steps:
(1), tested sensor is placed on the sensor installation site, test chamber 17 back of heating arrangement 2;
Tested sensor is installed on the sensor installation site 27 of test chamber 17, tightens, guarantee that interface is air tight.
(2), 26 work of the vacuum generator in the exhaust emissions treating apparatus 5, extract the test chamber 17 and the residual gas in the connecting tube of heating arrangement 2 clean;
Vacuum generator 26 work in the exhaust emissions treating apparatus 5 are extracted the residual gas in test chamber 17 and the gas path pipe clean.
(3), accurately control the tested analog gas that gets into heating furnace 16 burner hearths that add heating arrangement 2 by the distributing instrument 9 of simulated exhaust gas air distributing device 1;
According to requirement of experiment, in simulated exhaust gas air distributing device 1, each component source of the gas (nitrogen, oxygen, nitrogen monoxide, nitrogen dioxide, nitrogen, carbon monoxide, carbon dioxide) gets into five groups of distributing instruments 9 by gas-holder 6 through pressure regulator valve 7 and mass flowmeter 8 backs; Through the acting in conjunction of five groups of distributing instruments 9 with the pressure regulator valve 7 of each source of the gas; Make the tested analog gas Pass Test requirement of final entering heating furnace 16 burner hearths, in tested analog gas, add water vapor if desired, the gaseous environment under the simulation wet environment; Can utilize water vapor generation device 10; Suitably with adding water vapor in the mixed gas, the unlatching of water vapor generation device 10 is by the second pressure regulator valve 7A and second mass flowmeter 8A control, if do air turbulence test or pid parameter adjusting test; Can open disturbance gas valve 13 and disturbance mass-flow gas meter 14; Disturbance gas generating unit 12 adds disturbance gas in heating arrangement 2, at this moment, the test simulation gas for preparing gets into heating arrangement 2.
(4), heating furnace 16 burner hearths are provided with heating-up temperature according to testing requirements;
Open analog gas Open valve 15 control test simulation gases and get into heating arrangement 2; In heating arrangement 2; Test simulation gas heats through the test chamber 17 in the electric furnace 16; Make the temperature of test simulation gas reach the vehicle exhaust temperature, gas temperature sensor 18 and tail-gas analyzer 19 are installed on the test chamber 17, be used for detecting the temperature and the state of test simulation gas.
(5), the 20 control NOx sensor work of the NOx sensor controller in the SCR pick-up unit 3, SCR pick-up unit 3 cooperates simulated exhaust gas air distributing devices 1 to measure the content of oxides of nitrogen value, thereby confirms whether operate as normal of NOx sensor;
The test simulation gas that preheating is good arrives the tested NOx sensor on the sensor installation site 27; NOx sensor controller 20 control NOx sensor work in the SCR supervising device 3; NOx sensor controller 20 is connected through the CAN communication with SCR control device 21; SCR control device 21 reads the data message in the NOx sensor controller 20; Demonstrate detected oxygen content of NOx sensor and amount of nitrogen oxides very intuitively through the display device in the system; And the displayed value through the SCR monitoring software can be done contrast with the setting value of air distributing device, can know whether operate as normal of NOx sensor.
(6), in NOx sensor work, utilize the PXI modular testing in the electric signal proving installation 4 to measure the electrical signal information that goes out each circuit of NOx sensor with the control criterion platform measuring;
Between sensor installation site 27 and NOx sensor controller 20, arrange to have the electrical signal collection interface 22 of electric signal proving installation, electric signal proving installation 4 is through the electric signal of this interface collection NOx sensor, and the electric signal proving installation comprises a plurality of 7 half multimeter modules; A matrix change-over switch module; A multi-functional analog acquisition module, oscillograph modules etc. are through above-mentioned module combinations; Can realize the measurement of pA level current signal, nV magnitude voltage signals between each circuit; The variation of the heating resistor of thermopair, the wave form varies of heating voltage and each measurement circuit electric signal, to individual line carry out voltage, electric current applies; And the electric signal synchronism detection, above-mentioned data can be gathered, preserve and analyze through LabVIEW software.
(7), handle the gas of discharging by the emission-control equipment in the exhaust emissions treating apparatus 5 24.
The test simulation gas waste gas that constantly gets into test chamber 17 in the test enters exhaust emissions treating apparatus 5 through exhausr port; Test simulation gas waste gas gets into emission-control equipment 24; Carrying out chemical reaction absorbs; Remaining innocuous gas is discharged outdoor, and the folding of emission-control equipment 24 is through 23 controls of waste gas Open valve.
Through said system, can change: 1, the change of gas temperature test environment below the NOx sensor and condition; 2, the change of nitric oxide concentration; 3, the change of content of nitrogen dioxide; 4, the change of oxygen concentration; 5, the change of nitrogen gas concn; 6, whether add water vapor; 7, air turbulence is disturbed and is applied; 8, the sensor heating voltage applies; 9, fine setting of each slotted line electric signal of sensor etc.
Claims (6)
1. the detection system of a NOx sensor; It is characterized in that: comprise simulated exhaust gas air distributing device (1), heating arrangement (2), SCR pick-up unit (3), electric signal proving installation (4); Exhaust emissions treating apparatus (5); Simulated exhaust gas air distributing device (1) links to each other with an end of heating arrangement (2), and the other end of heating arrangement (2) is parallel with SCR pick-up unit (3), electric signal proving installation (4) and exhaust emissions treating apparatus (5)
Said simulated exhaust gas air distributing device (1) comprises at least two gas-holder (6) that are used to store different simulated exhaust gas; Wherein there is one to be nitrogen storage gas tank (6A); Gas-holder (6) is through pressure regulator valve (7) quality of connection flowmeter (8), and mass flowmeter (8) connects distributing instrument (9), and distributing instrument (9) connects heating arrangement through analog gas Open valve (15); Nitrogen storage gas tank (6A) also is parallel with second pressure regulator valve (7A); Be connected with second mass flowmeter (8A) and water vapor generation device (10) on second pressure regulator valve (7A) in turn, water vapor generation device (10) also is connected on the analog gas Open valve (15)
Said simulated exhaust gas air distributing device (1) also comprises the air inlet device; The air inlet device comprises disturbance gas generating unit (12); Disturbance gas generating unit (12) connects disturbance mass-flow gas meter (14) through disturbance gas valve (13), and disturbance mass-flow gas meter (14) is connected on the heating arrangement.
2. the detection system of NOx sensor according to claim 1; It is characterized in that: said heating arrangement (2) comprises heating furnace (16) and test chamber (17); Test chamber (17) is installed in the heating furnace (16); Test chamber (17) is provided with air intake opening and gas outlet; The air intake opening of test chamber (17) connects the disturbance mass-flow gas meter (14) and the analog gas Open valve (15) of simulated exhaust gas air distributing device (1), and the gas outlet of test chamber (17) connects SCR pick-up unit (3), electric signal proving installation (4) and exhaust emissions treating apparatus (5)
The gas outlet of test chamber (17) is through connecting SCR pick-up unit (3), electric signal proving installation (4) and exhaust emissions treating apparatus (5).
3. the detection system of NOx sensor according to claim 1; It is characterized in that: said SCR pick-up unit (3) comprises NOx sensor controller connected to one another (20) and SCR control device (21), and the SCR control device comprises controller and display device.
4. the detection system of NOx sensor according to claim 1, it is characterized in that: said electric signal proving installation (4) comprising: the PXI modular testing is measured and control criterion platform and platform display.
5. the detection system of NOx sensor according to claim 1; It is characterized in that: said exhaust emissions treating apparatus (5) comprising: vacuum generator (26), emission-control equipment (24); The air intake opening of emission-control equipment (24) connects the test chamber (17) of heating arrangement (2) through waste gas Open valve (23); Vacuum generator (26) is connected the gas outlet of emission-control equipment (24) through vacuum generator by-pass valve control (25), is connected with tail-gas analyzer (19) through gas temperature sensor (18) between the test chamber of heating arrangement (17) and the emission-control equipment (24).
6. the detection method of a NOx sensor detection system is characterized in that, comprises the steps:
(1), tested sensor is placed on the sensor installation site, test chamber (17) back of heating arrangement (2);
(2), the work of the vacuum generator (26) in the exhaust emissions treating apparatus (5), extract the test chamber (17) and the residual gas in the connecting tube of heating arrangement (2) clean;
(3), accurately control the tested analog gas that gets into heating furnace (16) burner hearth that adds heating arrangement (2) by the distributing instrument (9) of simulated exhaust gas air distributing device (1);
(4), heating furnace (16) burner hearth is provided with heating-up temperature according to testing requirements;
(5), the control of the NOx sensor controller (20) in the SCR pick-up unit (3) NOx sensor work; SCR pick-up unit (3) cooperates simulated exhaust gas air distributing device (1) to measure the content of oxides of nitrogen value, thereby confirms whether operate as normal of NOx sensor;
(6), in NOx sensor work, utilize the PXI modular testing in the electric signal proving installation (4) to measure the electrical signal information that goes out each circuit of NOx sensor with the control criterion platform measuring;
(7), handle the gas of discharging by the emission-control equipment (24) in the exhaust emissions treating apparatus (5).
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