CN102608277B - Detection method of detection system for oxynitride sensor - Google Patents
Detection method of detection system for oxynitride sensor Download PDFInfo
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- CN102608277B CN102608277B CN201210104621.5A CN201210104621A CN102608277B CN 102608277 B CN102608277 B CN 102608277B CN 201210104621 A CN201210104621 A CN 201210104621A CN 102608277 B CN102608277 B CN 102608277B
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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 that society faces, various countries are also more and more higher to the requirement of air quality, automotive emission has become main atmosphere pollution, at present, engine aftertreatment system is measured nitrogen oxide in tail gas concentration by NOx sensor, and the oxides of nitrogen value getting by NOx sensor takes appropriate measures to reduce the discharge of oxides of nitrogen gas, the content of harmful nitrogen oxide gas in exhaust emissions is dropped to minimum, reach the requirement of reduction of discharging.
At present, to how testing NOx sensor, lack effective method, general method is utilized testing laboratory's stand exactly, at exhaust emission pipeline place, the NOx sensor of laying is tested, but in bench run process, expend a large amount of fuel oils and need to arrange platform experiment chamber staff to coordinate, and in bench run process, can not control accurately the formation of tail gas test gas, in addition due to the restriction of experimental site itself, NOx sensor can not in depth be tested, for this problem, we detect the duty of NOx sensor in the urgent need to a kind of efficient system, for NOx sensor understood and study in depth use.
Summary of the invention
The object of this invention is to provide a kind of detection system and detection method of NOx sensor, can facilitate researchist the NOx sensor in work to be carried out to the research of control strategy and performance test.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of NOx sensor detection system, comprise simulated exhaust gas air distributing device, heating arrangement, SCR(SCR) pick-up unit, electric signal measuring apparatus, exhaust emissions treating apparatus, simulated exhaust gas air distributing device is connected with one end of heating arrangement, the other end of heating arrangement is parallel with SCR pick-up unit, electric signal measuring apparatus and exhaust emissions treating apparatus
Simulated exhaust gas air distributing device comprises that at least two for storing the gas-holder of different simulated exhaust gas, wherein there is one for nitrogen storage gas tank, gas-holder is by pressure regulator valve quality of connection flowmeter, mass flowmeter connects distributing instrument, distributing instrument connects heating arrangement by analog gas Open valve, and nitrogen storage gas tank is also parallel with the second pressure regulator valve, is connected with the second mass flowmeter and water vapor generation device on the second pressure regulator valve in turn, water vapor generation device is also connected on analog gas Open valve
Simulated exhaust gas air distributing device also comprises air inlet device, and air inlet device comprises disturbance gas generating unit, and disturbance gas generating unit connects disturbance mass-flow gas meter by pressure loading valve, and disturbance mass-flow gas meter is connected on heating arrangement.
Heating arrangement comprises heating furnace and test chamber, test chamber is arranged in heating furnace, on test chamber, be provided with air intake opening and gas outlet, disturbance mass-flow gas meter and the analog gas Open valve of the air intake opening connecting analog tail gas air distributing device of test chamber, the gas outlet of test chamber connects SCR pick-up unit, electric signal measuring apparatus and exhaust emissions treating apparatus
The gas outlet of test chamber is by connecting SCR pick-up unit, electric signal measuring apparatus and exhaust emissions treating apparatus.
SCR pick-up unit comprises NOx sensor controller connected to one another and SCR control device, and SCR control device comprises controller and display device.
Electric signal measuring apparatus comprises: PXI modular testing is measured and control criterion platform and platform display.
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 by waste gas Open valve, vacuum generator is connected to the gas outlet of emission-control equipment by vacuum generator by-pass valve control, between the test chamber of heating arrangement and emission-control equipment, by gas temperature sensor and tail-gas analyzer, be connected.
A detection method for NOx sensor detection system, comprises the steps:
(1), tested sensor is placed on after the test chamber of heating arrangement on installation of sensors position;
(2) the vacuum generator work, in exhaust emissions treating apparatus, extracts the residual gas in the test chamber of heating arrangement and connecting tube clean;
(3), by the distributing instrument of simulated exhaust gas air distributing device, accurately control the tested analog gas that enters heating furnace (16) burner hearth that adds heating arrangement;
(4), heating furnace burner hearth arranges heating-up temperature according to testing requirements;
(5) the NOx sensor controller control NOx sensor work, in SCR pick-up unit, SCR pick-up unit coordinates simulated exhaust gas air distributing device to measure the content of oxides of nitrogen value, thereby confirms whether NOx sensor normally works;
(6), in NOx sensor work, utilize PXI modular testing in electric signal measuring apparatus to measure the electrical signal information that goes out the each circuit of NOx sensor with control criterion platform measuring;
(7), by the emission-control equipment in exhaust emissions treating apparatus, process the gas of discharging.
NOx sensor detection system of the present invention and detection method have following features:
1. accurately simulated exhaust gas environment of air distributing device, and gas is delivered to test cavity through heating, then testing sensor;
2. the electric tube furnace that heating arrangement uses, heats efficient and conveniently, and the test chamber in electric furnace can improve replacing according to different test requests, and changeability is good;
3, NOx sensor is moved by controller, and by SCR system monitoring, oxygen content, amount of nitrogen oxides that the sensor monitoring records, the value obtaining with gas distributing system contrasts, and can know that whether working sensor situation is good;
4,, by the PXI platform of NI, can Accurate Analysis process the electric signal in NOx sensor work;
5, tail gas is through purified treatment, pollution-free.
NOx sensor detection system of the present invention is simple in structure, can carry out the test to the different test requests of NOx sensor, can test the real-time working state of NOx sensor, and record related data, can, for NOx sensor research and development, solve researchist's groping NOx sensor test carrier.
Accompanying drawing explanation
Fig. 1 is detection system structural representation of the present invention;
Fig. 2 is that detection system of the present invention is installed the application schematic diagram after tested sensor;
Fig. 3 is method of testing FB(flow block) of the present invention.
In figure: 1-simulated exhaust gas air distributing device, 2-heating arrangement, 3-SCR pick-up unit, 4-electric signal measuring apparatus, 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-installation of sensors position, 6A-nitrogen storage gas tank, 7A-the second pressure regulator valve, 8A-the second mass flowmeter.
Embodiment
Below in conjunction with accompanying drawing, further illustrate technical scheme of the present invention.
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 measuring apparatus 4, exhaust emissions treating apparatus 5, simulated exhaust gas air distributing device 1 is connected with one end of heating arrangement 2, the other end of heating arrangement 2 is parallel with SCR pick-up unit 3, electric signal measuring apparatus 4 and exhaust emissions treating apparatus 5, simulated exhaust gas air distributing device 1 comprises that at least two for storing the gas-holder 6 of different simulated exhaust gas, wherein there is one for nitrogen storage gas tank 6A, gas-holder 6 is by pressure regulator valve 7 quality of connection flowmeters 8, mass flowmeter 8 connects distributing instrument 9, distributing instrument 9 connects heating arrangement by analog gas Open valve 15, nitrogen storage gas tank 6A is also parallel with the second pressure regulator valve 7A, on the second pressure regulator valve 7A, be connected with the second mass flowmeter 8A and water vapor generation device 10 in turn, water vapor generation device 10 is also connected on analog gas Open valve 15,
Simulated exhaust gas air distributing device 1 also comprises air inlet device, air inlet device comprises disturbance gas generating unit 12, disturbance gas generating unit 12 connects disturbance mass-flow gas meter 14 by disturbance gas valve 13, and disturbance mass-flow gas meter 14 is connected on heating arrangement.
Heating arrangement 2 comprises heating furnace 16 and test chamber 17, test chamber 17 is arranged in heating furnace 16, on test chamber 17, be provided with air intake opening and gas outlet, disturbance mass-flow gas meter 14 and the analog gas Open valve 15 of the air intake opening connecting analog tail gas air distributing device 1 of test chamber 17, the gas outlet of test chamber 17 connects SCR pick-up unit 3, electric signal measuring apparatus 4 and exhaust emissions treating apparatus 5, and the gas outlet of test chamber 17 is by connecting SCR pick-up unit 3, electric signal measuring apparatus 4 and exhaust emissions treating apparatus 5.
SCR pick-up unit 3 comprises NOx sensor controller 20 connected to one another and SCR control device 21, and SCR control device comprises controller and display device.
Electric signal measuring apparatus 4 comprises: 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 by waste gas Open valve 23, vacuum generator 26 is connected to the gas outlet of emission-control equipment 24 by vacuum generator by-pass valve control 25, between the test chamber 17 of heating arrangement and emission-control equipment 24, by gas temperature sensor 18 and tail-gas analyzer 19, be connected.
In 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 five groups of distributing instruments 9 of ppm rank, by five groups of distributing instruments 9 and the pressure regulator valve 7 of each point of source of the gas, the common use of mass flowmeter 8, make finally to enter the tested analog gas Pass Test requirement of heating furnace 16 burner hearths, this is the test simulation gas preparing.
SCR pick-up unit 3 is connected electrical signal collection interface 22 with the p-wire of electric signal measuring apparatus 4, and when detecting on the test chamber 17 of tested installation of sensors in heating arrangement 2, electrical signal collection interface 22 is connected on the signal wire of sensor.
Simulated exhaust gas air distributing device 1 is connected with heating arrangement 2, test simulation gas enters heating arrangement 2 via pipeline and heats, for detecting being arranged on the tested NOx sensor on test chamber 17 installation of sensors positions 27 in heating arrangement 2, the high temperature that heating arrangement 2 simulated automotives are discharged, the heating 16 of using is electric tube furnace, temperature can realize automatic adjusting, the benefit of electric tube furnace is the requirement difference that can test, design different test chambers 17, for laying tail-gas analyzer 19, temperature sensor 18, the devices such as tested NOx sensor.
SCR pick-up unit 3, electric signal measuring apparatus 4 and tail-gas analyzer 19, temperature sensor 18 are monitored test simulation gas and the NOx sensor that is arranged on installation of sensors position 27 simultaneously.
In SCR supervising device 3, NOx sensor controller 20 is connected by CAN communication with SCR control device 21, SCR control device 21 is connected with the computer that monitoring software is housed by LIN communication again, realized in testing process, to the monitoring of the interior oxygen of test chamber 17 and amount of nitrogen oxides, and the value arranging with five groups of distributing instruments 9 is as comparing foundation.
What electric signal measuring apparatus 4 was used is the measurement of PXI modular testing and control criterion platform of U.S. American National instrument company (NI), to the voltage of the each circuit of NOx sensor, electric current, resistance signal is tested, its signal degree of accuracy can reach nV, pA, n Ω rank, each module in platform can realize synchronism detection, synchronous error can guarantee microsecond rank, can know so the real-time electric signal of NOx sensor heating resistor and the situation of change of resistance, simultaneously, in platform, be provided with analog output module, change to the more additional signals of sensor, studied, by existing LabVIEW software programming in platform, can realize measurement to unlike signal and the analysis of data.
Discharging processing device 5 comprises a vacuum generator 26, and front by the Bas Discharged in test chamber 17 for testing, an emission-control equipment 24, for the absorption of oxides of nitrogen in tail gas, prevents that waste gas from working the mischief to human and environment.
In system, can add gas valve at different positions as required and control the flow direction of test gas.
A detection method for NOx sensor detection system, comprises the steps:
(1), tested sensor is placed on the rear installation of sensors of test chamber 17 position of heating arrangement 2;
Tested installation of sensors, on the installation of sensors position 27 of test chamber 17, is tightened, guaranteed that interface is air tight.
(2) vacuum generator 26, in exhaust emissions treating apparatus 5 is worked, and the residual gas in the test chamber of heating arrangement 2 17 and connecting tube is extracted clean;
Vacuum generator 26 in exhaust emissions treating apparatus 5 is worked, and the residual gas in test chamber 17 and gas path pipe is extracted clean.
(3), by the distributing instrument 9 of simulated exhaust gas air distributing device 1, accurately control the tested analog gas that enters heating furnace 16 burner hearths that add heating arrangement 2;
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) by gas-holder 6, enter five groups of distributing instruments 9 after by pressure regulator valve 7 and mass flowmeter 8, acting in conjunction by five groups of distributing instruments 9 with the pressure regulator valve 7 of each source of the gas, make finally to enter the tested analog gas Pass Test requirement of heating furnace 16 burner hearths, if need to add water vapor in tested analog gas, gaseous environment under simulation wet environment, can utilize water vapor generation device 10, suitably water vapor will be added in mixed gas, the unlatching of water vapor generation device 10 is controlled by the second pressure regulator valve 7A and the second mass flowmeter 8A, if do air turbulence test or pid parameter, regulate 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, now, the test simulation gas preparing enters heating arrangement 2.
(4), heating furnace 16 burner hearths arrange heating-up temperature according to testing requirements;
Unlatching analog gas Open valve 15 is controlled test simulation gas and is entered heating arrangement 2, in heating arrangement 2, test simulation gas heats through the test chamber 17 in electric furnace 16, make the temperature of test simulation gas reach vehicle exhaust temperature, gas temperature sensor 18 and tail-gas analyzer 19 are installed on test chamber 17, are used for detecting temperature and the state of test simulation gas.
(5) the NOx sensor controller 20, in SCR pick-up unit 3 is controlled NOx sensor work, and SCR pick-up unit 3 coordinates simulated exhaust gas air distributing device 1 to measure the content of oxides of nitrogen value, thereby confirms whether NOx sensor normally works;
Preheated test simulation gas arrives the tested NOx sensor on installation of sensors position 27, NOx sensor controller 20 in SCR supervising device 3 is controlled NOx sensor work, NOx sensor controller 20 is connected by CAN communication with SCR control device 21, SCR control device 21 reads the data message in NOx sensor controller 20, by the display device in system, demonstrate very intuitively oxygen content and the amount of nitrogen oxides that NOx sensor detects, and the displayed value by SCR monitoring software can contrast with the setting value of air distributing device, can know whether NOx sensor normally works.
(6), in NOx sensor work, utilize PXI modular testing in electric signal measuring apparatus 4 to measure the electrical signal information that goes out the each circuit of NOx sensor with control criterion platform measuring;
Between installation of sensors position 27 and NOx sensor controller 20, arrange to have the electrical signal collection interface 22 of electric signal measuring apparatus, electric signal measuring apparatus 4 gathers the electric signal of NOx sensor by this interface, electric signal measuring apparatus comprises the multimeter module of multiple 7 half, a matrix change-over switch module, a Multi-functional analog acquisition module, an oscillograph module etc., by above-mentioned module, combine, can realize pA level current signal between each circuit, the measurement of nV magnitude voltage signals, the variation of the heating resistor of thermopair, the wave form varies of heating voltage and each measurement circuit electric signal, indivedual circuits are carried out to voltage, electric current applies, and electric signal synchronism detection, above-mentioned data can gather by LabVIEW software, preserve and analyze.
(7), by the emission-control equipment 24 in exhaust emissions treating apparatus 5, processed the gas of discharge.
The test simulation gas waste gas that constantly enters test chamber 17 in test enters exhaust emissions treating apparatus 5 by exhausr port, test simulation gas waste gas enters emission-control equipment 24, carry out chemical reaction absorption, outside remaining innocuous gas discharge chamber, the folding of emission-control equipment 24 is controlled by waste gas Open valve 23.
By said system, can change the test environment below NOx sensor and condition: 1, the change of gas temperature; 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, sensor heating voltage applies; 9, fine setting of the each slotted line electric signal of sensor etc.
Claims (1)
1. a detection method for NOx sensor detection system, is characterized in that, comprises the steps:
(1), tested sensor is placed on the rear installation of sensors of test chamber (17) position of heating arrangement (2);
(2) vacuum generator (26) work, in exhaust emissions treating apparatus (5), extracts the residual gas in the test chamber of heating arrangement (2) (17) and connecting tube clean;
(3), by the distributing instrument (9) of simulated exhaust gas air distributing device (1), accurately controlled the tested analog gas of heating furnace (16) burner hearth that enters heating arrangement (2);
(4), heating furnace (16) burner hearth arranges heating-up temperature according to testing requirements;
(5), the NOx sensor controller (20) in SCR pick-up unit (3) is controlled NOx sensor work, SCR pick-up unit (3) coordinates simulated exhaust gas air distributing device (1) to measure the content of oxides of nitrogen value, thereby confirms whether NOx sensor normally works;
(6), in NOx sensor work, utilize PXI modular testing in electric signal measuring apparatus (4) to measure the electrical signal information that goes out the each circuit of NOx sensor with control criterion platform measuring;
(7), by the emission-control equipment (24) in exhaust emissions treating apparatus (5), process the gas of discharging.
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