CN113295751B - Novel calibration test system for nitrogen-oxygen sensor - Google Patents

Novel calibration test system for nitrogen-oxygen sensor Download PDF

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CN113295751B
CN113295751B CN202110563644.1A CN202110563644A CN113295751B CN 113295751 B CN113295751 B CN 113295751B CN 202110563644 A CN202110563644 A CN 202110563644A CN 113295751 B CN113295751 B CN 113295751B
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nitrogen
oxygen sensor
calibration
concentration
gas
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CN113295751A (en
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易均金
高华
胥家军
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Gaoxin Environmental Protection Technology Suzhou Co ltd
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Gaoxin Environmental Protection Technology Suzhou Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/409—Oxygen concentration cells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
    • G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
    • G01M15/104—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases using oxygen or lambda-sensors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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Abstract

The invention provides a novel calibration test system for a nitrogen-oxygen sensor, and relates to the technical field of sensor calibration. The system comprises an upper computer control module, a mixed gas source module and a test bench module; the upper computer control module comprises an upper computer, a USB connection box and an industrial control card; the mixed gas source module comprises a plurality of gas sources, a plurality of digital gas flow meters and a gas mixing cavity; the test bench module comprises a heating furnace and an exhaust pipeline arranged on the heating furnace, and a plurality of nitrogen-oxygen sensors can be simultaneously accommodated on the test bench; the upper computer controls the concentration of NO and O2 in the mixed gas flowing into the exhaust pipeline by controlling the flowmeter. In the calibration test of the nitrogen-oxygen sensors, the upper computer control module is adopted to effectively control the proportion of the mixed gas and complete the setting of the internal calibration parameters of the nitrogen-oxygen sensors, so that the calibration test can be carried out on a plurality of nitrogen-oxygen sensors at the same time, the production consistency of products of manufacturers is greatly improved, the quality of the products is ensured, and the production test efficiency is improved.

Description

Novel calibration test system for nitrogen-oxygen sensor
Technical Field
The invention relates to the technical field of sensor calibration, in particular to a novel nitrogen-oxygen sensor calibration test system.
Background
In engine exhaust emissions, the toxic gas contains nitrogen and in order to detect and control the amount of nitrogen and oxygen emitted, two nitrogen and oxygen sensors are typically provided on the exhaust gas emission line. The front nitrogen-oxygen sensor is applied to measuring the concentration of nitrogen-oxygen gas, the SCR (urea injection system) then feeds back the concentration value signal and the exhaust gas temperature to the vehicle CAN communication system, so that the urea injection system forms an accurate injection quantity, and the emission quantity of nitrogen-oxygen is controlled in a closed loop manner; in addition, the OBD diagnostic system can judge the qualification of the emission according to the nitrogen-oxygen signal output by the post-nitrogen-oxygen sensor.
Therefore, the performance of the nitrogen-oxygen sensor is critical to engine exhaust emission detection. However, in the mass production and manufacturing process of the traditional nitrogen-oxygen sensor, before the nitrogen-oxygen sensor leaves the factory, each sensor needs to be measured and calibrated one by using calibration software, and software parameters are modified after the sensor has poor performance, so that the production efficiency is low, and the product consistency is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a novel calibration test system for a nitrogen-oxygen sensor, so as to solve the problems of poor factory consistency and low accuracy of the nitrogen-oxygen sensor.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides a novel calibration test system for a nitrogen-oxygen sensor, which is used for performing calibration test on the nitrogen-oxygen sensor, and comprises an upper computer control module, a mixed gas source module and a test bench module;
the upper computer control module comprises an upper computer, a USB connection box and an industrial control card, and the upper computer is connected with the industrial control card through the USB connection box;
the mixed gas source module comprises a plurality of gas sources, a plurality of digital gas flow meters and a gas mixing cavity, wherein the digital gas flow meters are connected with the plurality of gas sources in a one-to-one correspondence manner, and the gas from the plurality of gas sources flows out through the corresponding digital gas flow meters and is mixed in the gas mixing cavity to form mixed gas, and the mixed gas is used for providing simulated automobile exhaust;
the test bench module comprises a heating furnace and an exhaust pipeline arranged on the heating furnace, a fixing device for fixing the nitrogen-oxygen sensors to be tested is arranged on the exhaust pipeline, and a plurality of nitrogen-oxygen sensors to be tested can be simultaneously accommodated on the test bench module;
the upper computer is connected with the digital gas flow, the industrial control card is connected with a nitrogen-oxygen sensor to be tested which is placed on the test bench module, and the gas mixing cavity is in fluid communication with the exhaust pipeline;
the upper computer controls the concentration of NO and O2 in the mixed gas flowing into the exhaust pipeline through the gas mixing cavity by controlling the digital gas flow meters, the industrial control card is used for acquiring test data of the nitrogen-oxygen sensor, and the heating furnace is used for heating the mixed gas in the exhaust pipeline.
Optionally, the heating furnace includes a plurality of wire heater and a plurality of temperature sensor that follow the equidistant setting of flow direction of gas in the exhaust duct, in the process of carrying out calibration test to nitrogen oxygen sensor, heats the gaseous mixture in the exhaust duct through a plurality of wire heater to make the temperature value that a plurality of temperature sensors sensed equal.
Alternatively, the gas mixing chamber is a lumen having a volume of 2L.
Optionally, the plurality of gas sources includes three gas sources: a nitrogen gas source, an air gas source, and a NO gas source, the concentration of NO in the NO gas source being 3000ppm.
Optionally, the industrial control card is a CAN adapter.
Optionally, in the calibration test of the nitrogen-oxygen sensor, a first nitrogen-oxygen sensor and a last nitrogen-oxygen sensor along the air flow direction in the exhaust pipeline in the plurality of nitrogen-oxygen sensors placed on the test bench module are standard sensors already calibrated, and all nitrogen-oxygen sensors located between the first nitrogen-oxygen sensor and the last nitrogen-oxygen sensor in the plurality of nitrogen-oxygen sensors are sensors to be calibrated.
Optionally, a nitrogen-oxygen sensor software calibration module is installed in the upper computer control module, the nitrogen-oxygen sensor software calibration module is utilized to input relevant parameters of the nitrogen-oxygen sensor calibration test, and the process of calibrating and testing the nitrogen-oxygen sensor comprises the following steps:
the method comprises the following steps of firstly, waiting for the stable nitrogen-oxygen current of each nitrogen-oxygen sensor on a test bench module to be 0.05 mu A, and then entering a second step;
step two, under 4 different preset calibration atmosphere points, obtaining a standard NO concentration measurement value and a standard O2 concentration measurement value in the mixed gas sensed by a standard sensor, wherein the standard NO concentration measurement value and the standard O2 concentration measurement value can be directly transmitted to each sensor to be subjected to calibration test through data line connection, a corresponding calibration curve is formed after data processing is carried out through each sensor to be subjected to calibration test, each sensor to be subjected to calibration test can output a corresponding test NO concentration value and a test O2 concentration value according to measured current value data and the corresponding calibration curve, and the preset calibration atmosphere points represent the NO concentration value and the O2 concentration value in the mixed gas preset for calibration of the nitrogen-oxygen sensor;
and thirdly, after the second step is finished, acquiring a check NO concentration measurement value and a check O2 concentration measurement value of each nitrogen-oxygen sensor to be subjected to calibration test under two different preset check atmosphere points, and determining the nitrogen-oxygen sensor with the corresponding concentration measurement value meeting the preset tolerance specification as a qualified nitrogen-oxygen sensor, wherein the preset check atmosphere points represent the NO concentration value and the O2 concentration value in the mixed gas preset for checking the nitrogen-oxygen sensor.
Optionally, the 4 different preset calibrated atmosphere points comprise:
a first preset calibration atmosphere point: the concentration range of NO is 60ppm plus or minus 5ppm, and the concentration range of O2 is 8% plusor minus 0.3%;
second preset calibration atmosphere point: the NO concentration value range is 560ppm plus or minus 20ppm, and the O2 concentration value range is 8% plusor minus 0.3%;
third preset calibration atmosphere point: the concentration range of NO is 60ppm plus or minus 10ppm, and the concentration range of O2 is 12% plusor minus 0.4%;
fourth preset calibration atmosphere point: the concentration value range of NO is 560ppm plus or minus 20ppm, the concentration value range of O2 is 12% plusor minus 0.4%,
the two different preset check atmosphere points include:
first preset check atmosphere points: the concentration range of NO is 10ppm plus or minus 10ppm, and the concentration of O2 is 20.3 percent;
second preset check atmosphere point: the range of NO concentration values is 560ppm + -56 ppm, and the range of O2 concentration values is 12% + -0.3%.
Optionally, the third step further comprises: and if the nitrogen-oxygen sensor to be calibrated has a nitrogen-oxygen sensor with the measured value of the NO concentration and the measured value of the O2 concentration not conforming to the preset tolerance specification, alarming and reminding are carried out.
Optionally, after the third step, the process of calibrating the nitrogen-oxygen sensor further includes: the qualified nitroxide sensor is cooled in an air atmosphere for half an hour and then packaged.
The beneficial effects of the invention include:
the test system provided by the invention comprises an upper computer control module, a mixed gas source module and a test bench module; the upper computer control module comprises an upper computer, a USB connection box and an industrial control card, and the upper computer is connected with the industrial control card through the USB connection box; the mixed gas source module comprises a plurality of gas sources, a plurality of digital gas flow meters and a gas mixing cavity, wherein the digital gas flow meters are connected with the plurality of gas sources in a one-to-one correspondence manner, and the gas from the plurality of gas sources flows out through the corresponding digital gas flow meters and is mixed in the gas mixing cavity to form mixed gas, and the mixed gas is used for providing simulated automobile exhaust; the test bench module comprises a heating furnace and an exhaust pipeline arranged on the heating furnace, a fixing device for fixing the nitrogen-oxygen sensors to be tested is arranged on the exhaust pipeline, and a plurality of nitrogen-oxygen sensors to be tested can be simultaneously accommodated on the test bench module; the upper computer is connected with the digital gas flow, the industrial control card is connected with a nitrogen-oxygen sensor to be tested which is placed on the test bench module, and the gas mixing cavity is in fluid communication with the exhaust pipeline; the upper computer controls the concentration of NO and O2 in the mixed gas flowing into the exhaust pipeline through the gas mixing cavity by controlling the digital gas flow meters, the industrial control card is used for acquiring test data of the nitrogen-oxygen sensor, and the heating furnace is used for heating the mixed gas in the exhaust pipeline. In the production calibration test of the nitrogen-oxygen sensors, the upper computer control module is adopted to effectively control the proportion of the mixed gas and complete the setting of the internal calibration parameters of the nitrogen-oxygen sensors, so that the calibration test can be carried out on a plurality of nitrogen-oxygen sensors at the same time, the production consistency of products of manufacturers is greatly improved, the quality of the products is ensured, and the production test efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic structural diagram of a novel calibration test system for a nitrogen-oxygen sensor according to an embodiment of the present invention;
FIG. 2 shows a schematic structural diagram of a nitrogen-oxygen sensor according to an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a zirconia ceramic probe provided by an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The performance of the nitrogen-oxygen sensor is important for detecting the exhaust emission of the engine. However, in the mass production and manufacturing process of the traditional nitrogen-oxygen sensor, before the nitrogen-oxygen sensor leaves the factory, each sensor needs to be measured and calibrated one by using calibration software, and software parameters are modified after the sensor has poor performance, so that the production efficiency is low, and the product consistency is poor. Therefore, it is desirable to provide a novel sensor calibration test technique.
The embodiment of the invention provides a novel calibration test system for a nitrogen-oxygen sensor, which is used for performing calibration test on the nitrogen-oxygen sensor, and comprises an upper computer control module 101, a mixed gas source module 102 and a test bench module 103 as shown in fig. 1.
The upper computer control module 101 comprises an upper computer 110, a USB connection box 111 and an industrial control card 112, wherein the upper computer 110 is connected with the industrial control card 112 through the USB connection box 111.
The mixed gas source module 102 includes a plurality of gas sources, a plurality of digital gas flow meters, and a gas mixing chamber, the plurality of digital gas flow meters are connected in one-to-one correspondence with the plurality of gas sources, and gas from the plurality of gas sources flows out via the corresponding digital gas flow meters and is mixed in the gas mixing chamber 120 to form a mixed gas, which is used to provide simulated automobile exhaust. Alternatively, for example, the plurality of gas sources may include three gas sources: a nitrogen gas source 121, an air gas source 122, and a NO gas source 123, the concentration of NO in the NO gas source 123 being 3000ppm. The nitrogen gas source 121 is connected to the digital gas flowmeter 124, the air gas source 122 is connected to the digital gas flowmeter 125, and the NO gas source 123 is connected to the digital gas flowmeter 126.
The test bench module 103 comprises a heating furnace 130 and an exhaust pipeline 131 arranged on the heating furnace 130, wherein a fixing device 133 (such as an automatic pressing mechanism) for fixing the nitrogen-oxygen sensors 132 to be tested is arranged on the exhaust pipeline 131, and a plurality of nitrogen-oxygen sensors to be tested can be simultaneously accommodated on the test bench module 103. Optionally, during calibration testing of the nitroxide sensor, the first nitroxide sensor 1321 and the last nitroxide sensor 1322 of the plurality of nitroxide sensors 132 placed on the test bench module 103 along the air flow direction in the exhaust pipe are standard sensors already calibrated, and all the nitroxide sensors located between the first nitroxide sensor and the last nitroxide sensor are sensors to be calibrated, for example, the nitroxide sensor 1320 is a sensor to be calibrated.
The upper computer 110 is connected with the digital gas flow, the industrial control card 112 is connected with a nitrogen-oxygen sensor to be tested placed on the test bench module 103, and the gas mixing chamber 120 is in fluid communication with the exhaust pipeline 131.
The upper computer 110 controls the concentrations of NO and O2 in the mixed gas flowing into the exhaust pipe 131 through the gas mixing chamber 120 by controlling the plurality of digital gas flow meters, the industrial control card 112 is used for acquiring test data of the nitrogen-oxygen sensor 132, and the heating furnace 130 is used for heating the mixed gas in the exhaust pipe 131. The direction of the arrows in fig. 1 indicate the direction of the air flow.
Fig. 2 shows a schematic structural diagram of a nitrogen-oxygen sensor according to an embodiment of the present invention. As shown in fig. 2, the nitrogen-oxygen sensor comprises a probe 141 and a controller 142, wherein the probe 141 is a zirconia ceramic probe, a platinum heating wire is arranged in the probe 141, and the probe 141 is connected with the controller 142 through a wire harness 143. The controller 142 includes a connector 1421 and a connector 1422. Connector 1421 is connected to harness 143, and connector 1422 is connected to the CAN bus.
Fig. 3 shows a schematic structural diagram of a zirconia ceramic probe provided by an embodiment of the present invention. As shown in fig. 3, the zirconia ceramic probe comprises a first zirconia ceramic layer 1001, a second zirconia ceramic layer 1002, a third zirconia ceramic layer 1003, a fourth zirconia ceramic layer 1004, a fifth zirconia ceramic layer 1005 and a sixth zirconia ceramic layer 1006 which are sequentially laminated from top to bottom, wherein a common electrode 1007 is provided on the first zirconia ceramic layer 1001, a main pump chamber 1008, a subsidiary pump chamber 1009 and a measurement pump chamber 1010 are sequentially provided in the second zirconia ceramic layer 1002 from left to right, a main pump electrode 1081 is provided on the upper side of the main pump chamber 1008, a main pump reference electrode 1082 is provided on the lower side of the main pump chamber 1008, a subsidiary pump reference electrode 1091 is provided on the upper side of the subsidiary pump chamber 1009, a subsidiary pump reference electrode 1011 is provided on the upper side of the measurement pump chamber 1010, a measurement pump reference electrode 1012 is provided on the lower side of the measurement pump chamber 1010, the chamber 1008 is communicated with the outside of the nitrogen-oxygen sensor ceramic chip through a first diffusion channel 1013, the chamber 1008 is communicated with the subsidiary pump chamber 1010 through a second diffusion channel 1008, and the subsidiary pump chamber 1010 is communicated with a third diffusion channel 1015 through the main pump channel 1015; the right side of the fourth zirconia ceramic layer 1004 is provided with a reference chamber 1016 communicated with the atmosphere, and the lower side of the reference chamber 1016 is provided with a reference electrode 1017; a platinum electrode heater wire 1018 is provided between the fifth zirconia ceramic layer 1005 and the sixth zirconia ceramic layer 106.
When the sensor works, tail gas sequentially enters the main pump chamber 1008, the auxiliary pump chamber 1009 and the measuring pump chamber 1010 from the first diffusion channel 1013, the second diffusion channel 1014 and the third diffusion channel 1015 in sequence, oxygen in the chamber is continuously pumped out by an oxygen pumping electrode in the zirconia ceramic probe, and the concentration value of the tail gas is fed back to the controller electronic control unit in the form of current (Ip 0 represents oxygen current; ip2 represents nitrogen-oxygen current; ip1 is regulating current and is not output, and V0, V1 and V2 are the Nernst voltages of the inner electrodes 1081, 1091 and 1011 to the reference electrode 1017 respectively); the electronic control unit simultaneously controls the heating temperature of the sensor probe (heating by the platinum electrode heater wire 118) and through a series of signal conditioning, the Nox concentration and oxygen concentration in the measurement pump chamber 1010 are determined by calculation. When the intelligent control system is used in a vehicle, the electronic control unit is communicated with the whole vehicle control center through the CAN bus, the concentration of NOx and O2 is sent to the automobile CAN bus in real time, and nitrogen oxide in the state six is used for providing basis for SCR injection quantity so as to reduce emission of NOx. In addition, the signals of nitrogen and oxygen after the sixth country are read and written by the OBD system and then whether the emission is qualified or not is judged; the post-nitroxide forms a closed loop control with the pre-nitroxide.
In the actual calibration test process before the nitrogen-oxygen sensor leaves the factory, a PC computer CAN be adopted as an upper computer, the upper computer is provided with calibration test software and various flow proportion adjustment control programs PLC for a mixed gas source, an industrial control card is used for communication between internal data of the sensor and a software control part of the upper computer, reading of the sensor data and correction of the sensor calibration data by the upper computer are convenient to achieve, the industrial control card is inserted on a USB enhancement box, two ends of the industrial control card are respectively connected with a sensor controller and a USB port of the PC upper computer, the industrial control card reads and writes working data of the sensor and transmits the data to the upper computer, and the industrial control card CAN adapter is an executor of the upper computer. The mixed gas source may include, for example: a pure nitrogen tank; a compressed air tank; NO and nitrogen mixing tank. The PLC of the upper computer issues instructions to the opening degrees of different valves of the electronic flowmeter so as to realize different mixing ratios of three different gases; thereby providing simulated automobile exhaust (different concentrations of NO, O2; NO uses 0-3000PPM concentration range, oxygen uses 0-21.3% concentration ratio range) for the test bench; in order to make the nitrogen-oxygen sensor in the best temperature activity range, the upper computer control software module is required to automatically calculate the best power range in a closed loop mode and upload the best power range to the sensor, a power monitoring module installed on a test bench module can be used for finding the power value of each sensor, in actual test, each bench can calibrate 16 sensors at the same time for example, and each power meter can adjust the power supply voltage of the corresponding sensor and display the working power of the sensor. The single machine of the embodiment of the invention can calibrate 16 single machines in 20 minutes, thereby greatly improving the production consistency and performance accuracy of the nitrogen-oxygen sensor products of manufacturers, ensuring the product quality and improving the production test efficiency
In summary, in the calibration test of the production of the nitrogen-oxygen sensor, the upper computer control module is adopted to effectively control the proportion of the mixed gas and complete the setting of the internal calibration parameters of the nitrogen-oxygen sensor, so that the calibration test can be carried out on a plurality of nitrogen-oxygen sensors at the same time, thereby greatly improving the production consistency of products of manufacturers, ensuring the quality of the products and improving the production test efficiency.
Optionally, the heating furnace 130 includes a plurality of wire heating devices 134 and a corresponding plurality of temperature sensors, which are disposed at equal intervals along the flow direction of the gas in the exhaust pipeline, and in the process of calibrating the nitrogen-oxygen sensor, the mixed gas in the exhaust pipeline 131 is heated by the plurality of wire heating devices 134, so that the temperature values sensed by the plurality of temperature sensors are equal, thereby ensuring the uniformity of the temperature of the mixed gas in the exhaust pipeline 131. For example, four wire current indicators may be provided on the heater 130, and during calibration, the four temperatures must be uniform to control the exhaust pipe temperature uniformity, with a temperature adjustment range of 25-600 ℃.
Alternatively, the gas mixing chamber 120 is a lumen having a volume of 2L.
Alternatively, the industrial control card 112 is a CAN adapter.
Optionally, a nitrogen-oxygen sensor software calibration module is installed in the upper computer control module 101, and the process of performing calibration test on the nitrogen-oxygen sensor by using the nitrogen-oxygen sensor software calibration module to input parameters related to the calibration test of the nitrogen-oxygen sensor comprises the following steps:
a first step of entering a second step after waiting for the nitrogen-oxygen current (Ip 2 current) of each nitrogen-oxygen sensor on the test bench module 103 to be stabilized at 0.05 μa; step two, under 4 different preset calibration atmosphere points, obtaining a standard NO concentration measurement value and a standard O2 concentration measurement value in the mixed gas sensed by a standard sensor, wherein the standard NO concentration measurement value and the standard O2 concentration measurement value can be directly transmitted to each sensor to be subjected to calibration test through data line connection, a corresponding calibration curve is formed after data processing is carried out through each sensor to be subjected to calibration test, each sensor to be subjected to calibration test can output a corresponding test NO concentration value and a test O2 concentration value according to measured current value data and the corresponding calibration curve, and the preset calibration atmosphere points represent the NO concentration value and the O2 concentration value in the mixed gas preset for calibration of the nitrogen-oxygen sensor; and thirdly, after the second step is finished, acquiring a check NO concentration measurement value and a check O2 concentration measurement value of each nitrogen-oxygen sensor to be subjected to calibration test under two different preset check atmosphere points, and determining the nitrogen-oxygen sensor with the corresponding concentration measurement value meeting the preset tolerance specification as a qualified nitrogen-oxygen sensor, wherein the preset check atmosphere points represent the NO concentration value and the O2 concentration value in the mixed gas preset for checking the nitrogen-oxygen sensor. Optionally, the third step further comprises: and if the nitrogen-oxygen sensor to be calibrated has a nitrogen-oxygen sensor with the measured value of the NO concentration and the measured value of the O2 concentration not conforming to the preset tolerance specification, alarming and reminding are carried out. Optionally, after the third step, the process of calibrating the nitrogen-oxygen sensor further includes: the qualified nitroxide sensor is cooled in an air atmosphere for half an hour and then packaged.
Specifically, the input value of the nitrogen-oxygen sensor software calibration module is sequentially as follows (the connection between each sensor and the calibration table is CAN serial port connection): in the first step (pre-ageing has been completed), after the sensor is started, the IP2 current can be stabilized at 0.05uA and the calibration step can be entered. And step two, in the atmosphere of 4 points, gradually outputting corresponding O2 and NO output values by the median standard sensor, wherein the values CAN be directly transmitted to each sensor software through data line connection, and the software processes the data to form a calibration curve, so that the sensor outputs corresponding O2 and NO values to an automobile CAN bus at a client according to the current values. Entering a third step, checking the function: after calibration, the calibration function is carried out, two points of calibration meet the tolerance specification, the product is taken off the shelf, then the product is cooled and packaged, the cooling time is half an hour (in the air), and the alarm function of low-temperature cooling (possibly damaging ceramic parts by water) is not realized: if the verification is not passed, an alarm is required, and if the alarm enters the step: the sensor presets reference voltages V0, V1, V2 and IP1, and manual input adjustment of the temperature coefficient duty ratio X% is set; after the step is finished, the sensor is not dismantled, and the sensor can enter the second step and the third step along with the next batch of sensors.
Optionally, the 4 different preset calibrated atmosphere points comprise: a first preset calibration atmosphere point: the concentration range of NO is 60ppm plus or minus 5ppm, and the concentration range of O2 is 8% plusor minus 0.3%; second preset calibration atmosphere point: the NO concentration value range is 560ppm plus or minus 20ppm, and the O2 concentration value range is 8% plusor minus 0.3%; third preset calibration atmosphere point: the concentration range of NO is 60ppm plus or minus 10ppm, and the concentration range of O2 is 12% plusor minus 0.4%; fourth preset calibration atmosphere point: the range of NO concentration values is 560ppm + -20 ppm and the range of O2 concentration values is 12% + -0.4%. The concentration values of the 4 calibration mixed atmospheres are based on the output values of the standard nitrogen-oxygen sensors and are transmitted to each on-measuring sensor calibration software, the software simultaneously has Ip2 measurement current values, and the concentration and the current form a calibration output curve; the concentration of the air source is adjusted to be near the target of 4 points.
The two different preset check atmosphere points include: first preset check atmosphere points: the concentration range of NO is 10ppm + -10 ppm, the concentration of O2 is 20.3% (atmosphere is air state, 20.3% is reference value); second preset check atmosphere point: the range of NO concentration values is 560ppm + -56 ppm, and the range of O2 concentration values is 12% + -0.3%. And under two different preset check atmosphere points, reading the data of each sensor to be calibrated, comparing the data with the data of a median standard component (standard sensor), wherein the difference of the NO concentration value under the first preset check atmosphere point is not more than +/-10 ppm, the difference of the O2 concentration value under the second preset check atmosphere point is not more than +/-0.3 percent, and the difference of the NO concentration value is not more than +/-56 ppm, and judging that the product is qualified.
In actual operation, in order to ensure the mixed atmosphere of 6 points, firstly, manually controlling to slowly find the flow value of the gas flowmeter corresponding to each atmosphere; and when the flow is actually in batch, the PLC is used for independently and closed-loop controlling each flow value. Although this flow value may have a tolerance, the flow must be stable to be tested.
The calibration process will be described in detail by way of example. In actual operation, the complete workflow of the upper computer for calibration test includes the following steps S101 to S106:
step S101: and (5) inputting calibration parameters.
The interface information of the upper computer in this step is shown in table 1.
Table 1 upper computer calibration parameter input interface information list
Wherein BZJ001 and BZJ002 correspond to standard sensors, and gx1 to gx14 are sensors to be calibrated.
Step S102: and (5) inputting a calibration coefficient.
The interface information of the upper computer in this step is shown in table 2.
Table 2 list of information of calibration coefficient input interface of upper computer
O2％ NO PPM IP0(uA) IP2(uA)
8 60 1200 0.29
8 560 990 1.8
12 60 2382 0.3
12 560 2700 1.75
Step S103: the sensor is activated.
The interface information of the upper computer in this step is shown in table 3.
Table 3 upper computer interface information list when sensor is started
Step S104: sensor checkpoint 1.
The interface information of the upper computer in this step is shown in table 4.
Table 4 list of upper computer interface information under sensor checkpoint 1
Step S105: sensor checkpoint 2.
The interface information of the upper computer in this step is shown in table 5.
Table 5 list of upper computer interface information under sensor checkpoint 2
Step 106: and (5) storing test data.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, but not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.

Claims (10)

1. The novel calibration test system for the nitrogen-oxygen sensor is used for performing calibration test on the nitrogen-oxygen sensor and is characterized by comprising an upper computer control module, a mixed gas source module and a test bench module;
the upper computer control module comprises an upper computer, a USB connection box and an industrial control card, and the upper computer is connected with the industrial control card through the USB connection box;
the mixed gas source module comprises a plurality of gas sources, a plurality of digital gas flow meters and a gas mixing cavity, wherein the digital gas flow meters are connected with the plurality of gas sources in a one-to-one correspondence manner, and the gas from the plurality of gas sources flows out through the corresponding digital gas flow meters and is mixed in the gas mixing cavity to form mixed gas, and the mixed gas is used for providing simulated automobile exhaust;
the test bench module comprises a heating furnace and an exhaust pipeline arranged on the heating furnace, a fixing device for fixing the nitrogen-oxygen sensors to be tested is arranged on the exhaust pipeline, and a plurality of nitrogen-oxygen sensors to be tested can be simultaneously accommodated on the test bench module;
the upper computer is connected with the digital gas flow, the industrial control card is connected with a nitrogen-oxygen sensor to be tested which is placed on the test bench module, and the gas mixing cavity is in fluid communication with the exhaust pipeline;
the upper computer controls the concentration of NO and O2 in the mixed gas flowing into the exhaust pipeline through the gas mixing cavity by controlling the digital gas flow meters, the industrial control card is used for acquiring test data of the nitrogen-oxygen sensor, and the heating furnace is used for heating the mixed gas in the exhaust pipeline.
2. The novel calibration test system of a nitrogen-oxygen sensor according to claim 1, wherein the heating furnace comprises a plurality of wire heating devices and a plurality of corresponding temperature sensors, wherein the wire heating devices are arranged at equal intervals along the flow direction of gas in the exhaust pipeline, and the mixed gas in the exhaust pipeline is heated by the wire heating devices in the calibration test process of the nitrogen-oxygen sensor, so that the temperature values sensed by the temperature sensors are equal.
3. The novel calibration test system of a nitrogen-oxygen sensor of claim 1, wherein the gas mixing chamber is a lumen having a volume of 2L.
4. The novel calibration test system of a nitrogen-oxygen sensor of claim 1, wherein said plurality of gas sources comprises three gas sources: a nitrogen gas source, an air gas source, and a NO gas source, wherein the concentration of NO in the NO gas source is 3000ppm.
5. The novel calibration test system of a nitrogen-oxygen sensor according to claim 1, wherein the industrial control card is a CAN adapter.
6. The novel nitrogen-oxygen sensor calibration test system according to claim 1, wherein in the process of calibrating the nitrogen-oxygen sensors, a first nitrogen-oxygen sensor and a last nitrogen-oxygen sensor in the air flow direction in the exhaust pipe among the plurality of nitrogen-oxygen sensors placed on the test bench module are standard sensors that have already been calibrated, and all nitrogen-oxygen sensors located between the first nitrogen-oxygen sensor and the last nitrogen-oxygen sensor among the plurality of nitrogen-oxygen sensors are sensors to be calibrated.
7. The novel calibration test system of a nitrogen-oxygen sensor according to claim 6, wherein the upper computer control module is provided with a nitrogen-oxygen sensor software calibration module, the nitrogen-oxygen sensor software calibration module is utilized to input related parameters of calibration test of the nitrogen-oxygen sensor, and the process of calibration test of the nitrogen-oxygen sensor comprises the following steps:
the method comprises the following steps of firstly, waiting for that the nitrogen-oxygen current of each nitrogen-oxygen sensor on the test bench module can be stabilized at 0.05 mu A, and then entering a second step;
step two, under 4 different preset calibration atmosphere points, obtaining a standard NO concentration measurement value and a standard O2 concentration measurement value in the mixed gas sensed by the standard sensor, wherein the standard NO concentration measurement value and the standard O2 concentration measurement value can be directly transmitted to each sensor to be subjected to calibration test through data line connection, a corresponding calibration curve is formed after data processing is carried out through each sensor to be subjected to calibration test, each sensor to be subjected to calibration test can output a corresponding test NO concentration value and a test O2 concentration value according to measured current value data and the corresponding calibration curve, and the preset calibration atmosphere points represent the NO concentration value and the O2 concentration value in the mixed gas preset for calibration of a nitrogen-oxygen sensor;
and thirdly, after the second step is finished, acquiring a check NO concentration measurement value and a check O2 concentration measurement value of each nitrogen-oxygen sensor to be subjected to calibration test under two different preset check atmosphere points, and determining the nitrogen-oxygen sensor with the corresponding concentration measurement value meeting the preset tolerance specification as a qualified nitrogen-oxygen sensor, wherein the preset check atmosphere points represent the NO concentration value and the O2 concentration value in the mixed gas preset for checking the nitrogen-oxygen sensor.
8. The novel calibration test system of claim 7, wherein the 4 different predetermined calibration atmosphere points comprise:
a first preset calibration atmosphere point: the concentration range of NO is 60ppm plus or minus 5ppm, and the concentration range of O2 is 8% plusor minus 0.3%;
second preset calibration atmosphere point: the NO concentration value range is 560ppm plus or minus 20ppm, and the O2 concentration value range is 8% plusor minus 0.3%;
third preset calibration atmosphere point: the concentration range of NO is 60ppm plus or minus 10ppm, and the concentration range of O2 is 12% plusor minus 0.4%;
fourth preset calibration atmosphere point: the concentration value range of NO is 560ppm plus or minus 20ppm, the concentration value range of O2 is 12% plusor minus 0.4%,
the two different preset check atmosphere points comprise:
first preset check atmosphere points: the concentration range of NO is 10ppm plus or minus 10ppm, and the concentration of O2 is 20.3 percent;
second preset check atmosphere point: the range of NO concentration values is 560ppm + -56 ppm, and the range of O2 concentration values is 12% + -0.3%.
9. The novel nitrogen-oxygen sensor calibration test system of claim 8, wherein the third step further comprises: and if the nitrogen-oxygen sensor to be calibrated has a nitrogen-oxygen sensor with the measured value of the NO concentration and the measured value of the O2 concentration not conforming to the preset tolerance specification, alarming and reminding are carried out.
10. The novel calibration test system of claim 8, wherein after the third step, the process of calibrating the nitrogen-oxygen sensor further comprises: the qualified nitroxide sensor is cooled in an air atmosphere for half an hour and then packaged.
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