CN110470800B - Gas distribution system and method for nitrogen oxide sensor calibration - Google Patents
Gas distribution system and method for nitrogen oxide sensor calibration Download PDFInfo
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- CN110470800B CN110470800B CN201910794242.5A CN201910794242A CN110470800B CN 110470800 B CN110470800 B CN 110470800B CN 201910794242 A CN201910794242 A CN 201910794242A CN 110470800 B CN110470800 B CN 110470800B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
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- 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
Abstract
The invention relates to a gas distribution system and a method for nitrogen oxide sensor calibration, the system comprises a gas mixer, an outlet of the gas mixer is communicated with an inlet of a first tee joint through a first pipeline, an outlet of the first tee joint is communicated with an inlet of a detection chamber through a second pipeline, a first valve is arranged on the second pipeline, an outlet of the detection chamber is communicated with an inlet of the second tee joint through a third pipeline, an air pump is arranged on the third pipeline, an outlet of the second tee joint is communicated with an evacuation pipeline, a second valve is arranged on the evacuation pipeline, an outlet of the first tee joint is communicated with an outlet of the second tee joint through a circulating pipeline, a third valve and a fourth valve are respectively arranged on the circulating pipeline close to the ends of the first tee joint and the second tee joint, and a standard sample groove for a standard sensor to insert and a detection groove for a sensor to insert are arranged on the detection chamber. Compared with calibration gas flowing in a single direction, the calibration gas flowing in a circulating manner is easier to ensure stability in the detection chamber, has high calibration accuracy, greatly saves gas consumption, and is particularly suitable for mass production.
Description
Technical Field
The invention relates to a gas distribution system and a calibration method for sensor calibration, in particular to a gas distribution system and a method for nitrogen oxide sensor calibration.
Background
A nitrogen oxide (NOx) sensor for detecting tail gas of an after-treatment system of a fuel vehicle consists of a sensitive ceramic probe and a control module, and is calibrated before use. The calibration of the sensor refers to a process of establishing the relationship between the output and the input of the sensor through tests and determining errors under different use conditions. After the manufacture and assembly of any sensor, the design index is required to be calibrated and tested to ensure the accurate transmission of the quantity value. The calibration of the nitrogen oxide sensor needs to provide standard gas sources with different specific contents, the calibration process is often long, more gas is consumed, and the existing gas distribution system is a calibration gas which continuously flows in a single direction, the content of the calibration gas is difficult to stabilize, and the calibration effect is influenced.
Disclosure of Invention
The invention provides a gas distribution system and a gas distribution method for nitrogen oxide sensor calibration, and aims to provide a gas distribution system which can ensure that calibration gas is stable, gas consumption is saved, and the gas distribution system is suitable for mass production.
The technical scheme for solving the technical problems is as follows: a gas distribution system for calibrating nitrogen oxide sensor comprises a gas distribution device 2 、N 2 The gas mixing instrument is mixed with three kinds of gases NO in proportion, the export of the gas mixing instrument is communicated with the inlet of a first tee joint through a first pipeline, the first outlet of the first tee joint is communicated with the inlet of a detection chamber through a second pipeline, a first valve is arranged on the second pipeline, the export of the detection chamber is communicated with the inlet of the third tee joint through a third pipeline, an air pump is arranged on the third pipeline, the first outlet of the second tee joint is communicated with an evacuation pipeline, a second valve is arranged on the evacuation pipeline, the second outlet of the first tee joint is communicated with the second outlet of the second tee joint through a circulating pipeline, one end of the circulating pipeline, which is close to the first tee joint, is provided with the third valve and is close to the fourth valve, and the detection chamber is provided with a plurality of standard sensor inserted standard sample grooves and a plurality of sensor inserted detection grooves for detection.
On the basis of the technical scheme, the invention can be further improved as follows.
Furthermore, pressure sensors for detecting the air pressure in the corresponding pipelines are respectively arranged on the first pipeline and the second pipeline.
The advantage of adopting above-mentioned further institutional advancement is, establish the sensor that detects its internal atmospheric pressure respectively on pipeline one and the pipeline two to guarantee that the atmospheric pressure in the pipeline one is suitable to be higher than the atmospheric pressure of pipeline two, can be in real time to the indoor supplementary gas of detection with the gas mixing appearance of assurance.
Further, the number of the standard sample grooves on the detection chamber is one, and the number of the detection grooves is multiple.
Preferably, the number of the detection grooves is two.
Adopt above-mentioned further institutional advancement's benefit to be, the quantity that detects the groove is a plurality of nitrogen oxide sensors that can detect a plurality of awaiting measuring of batch, but the quantity that detects the groove should not too much yet, otherwise the gas leakage phenomenon is serious, can influence the accuracy that the circulation detected.
Further, the first valve, the second valve, the third valve and the fourth valve are all electric valves.
The electric valve has the advantages of good controllability and convenient operation.
The invention also provides a method for calibrating the nitrogen oxide sensor, which utilizes the gas distribution system to calibrate the nitrogen oxide sensor and comprises the following steps:
the reset mode is entered first: respectively inserting the standard sensor and the sensor to be detected into the standard sample groove and the detection groove, then opening the air pump, opening the first valve, the second valve and the third valve, closing the fourth valve, continuously pumping for a period of time until the reading value of the standard sensor is stable and unchanged, and finishing the resetting;
then entering a cycle detection mode: keeping the opening states of the first valve and the third valve unchanged, closing the second valve and opening the fourth valve, simultaneously opening the gas mixing instrument to convey calibration gas into the detection chamber and keeping the opening states, circulating for a period of time until the reading of the standard sensor is stable, reading corresponding reading and calibrating the sensor to be detected in the detection tank according to the reading;
after the first calibration is finished, firstly closing the gas mixing instrument and the valve IV, then opening the valve II, entering the reset mode again, entering the circulating detection mode again after the reset is finished, starting the gas mixing instrument, conveying another calibration gas with different components into the detection chamber, and carrying out calibration again.
Specifically, in the circulation detection mode, the air pressure in the first pipeline is greater than the air pressure in the second pipeline.
Compared with the prior art, the invention has the beneficial effects that:
the gas distribution system and the method for calibrating the nitrogen oxide sensor can provide stable circulating calibration gas, the calibration gas circularly flows, compared with the traditional calibration gas flowing in a single direction, the components in the detection chamber are easier to ensure stability, the accuracy of calibrating the sensor is high, the gas consumption is greatly saved, and the system and the method are particularly suitable for mass production and use.
Drawings
FIG. 1 is a schematic diagram of a gas distribution system for nitrogen oxide sensor calibration according to the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1. a gas mixing instrument; 2. a first pipeline; 3. a tee joint I; 4. a second pipeline; 5. a first valve; 6. a detection chamber; 7. a third pipeline; 8. an air pump; 9. a second tee joint; 10. emptying the pipeline; 11. a second valve; 12. a circulation pipe; 13. a third valve; 14. and a valve IV.
Detailed Description
The principles and features of this invention are described in connection with the drawings and the detailed description of the invention, which are set forth below as examples to illustrate the invention and not to limit the scope of the invention.
In the description of the present invention, if terms indicating orientation such as "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc., are used, they indicate orientation or positional relationship based on that shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
As shown in FIG. 1, the invention provides a gas distribution system for nitrogen oxide sensor calibration, which comprises a nitrogen oxide sensor 2 、N 2 Mix gas appearance 1 of thoughtlessly joining in marriage with three kinds of gas of NO, the export of mixing gas appearance 1 is through pipeline one 2 and three way 3's import intercommunication, three way 3's export is just through pipeline two 4 and the import intercommunication of detection room 6 be equipped with valve one 5 on pipeline two 4, the export of detection room 6 is just through the import intercommunication of pipeline three 7 and tee bend two 9 be equipped with air pump 8 on pipeline three 7, three way two 9's export just with evacuation pipeline 10 intercommunication be equipped with valve two 11 on the evacuation pipeline 10The outlet two of the tee joint I3 is communicated with the outlet two of the tee joint II 9 through a circulating pipeline 12, one end, close to the tee joint I3, of the circulating pipeline 12 is provided with a valve III 13, one end, close to the tee joint II 9, of the circulating pipeline 12 is provided with a valve IV 14, and the detection chamber 6 is provided with a plurality of standard sensor inserting standard sample grooves and a plurality of sensor inserting detection grooves for detection.
In an embodiment of the present invention, the first pipeline 2 and the second pipeline 4 are respectively provided with a pressure sensor for detecting the air pressure in the corresponding pipelines; the number of the standard sample grooves on the detection chamber 6 is one, and the number of the detection grooves is multiple; the first valve 5, the second valve 11, the third valve 13 and the fourth valve 14 are all electric valves.
It should be noted that the gas mixing instrument, the detection chamber, and the standard sensor are all commercially available products, that is, the prior art, and the detailed structure and function are not described herein again.
Example 1
The method for calibrating the nitrogen-oxygen sensor by using the gas distribution system comprises the following steps:
the reset mode is entered first: respectively inserting a standard sensor and a sensor to be detected into a standard sample groove and a detection groove, then opening an air pump, a valve I, a valve II and a valve III, closing a valve IV, continuously pumping for a period of time (about 5min), and finishing the resetting until the reading value of the standard sensor is stable and unchanged;
then entering a cycle detection mode: keeping the opening states of the first valve and the third valve unchanged, closing the second valve and opening the fourth valve, simultaneously opening the gas mixing instrument to convey the calibration gas into the detection chamber, keeping the opening states of the first valve and the third valve, and calibrating O in the first valve 2 3% of NO, 100ppm of NO and the balance of N 2 Cycling for a period of time (about 15s or so), the standard sensor reading is stable, where O 2 Corresponding reading 3.1%, N 2 Reading the corresponding reading of 99ppm, and calibrating the sensor to be detected in the detection tank according to the reading;
after the calibration is finished, the gas mixing instrument and the valve IV are closed firstly, then the valve II is opened, the reset mode is entered again, and the detection chamber and the valve IV are connectedExhausting the gas in the circulating pipeline outwards (about 5min) to complete resetting, entering a circulating detection mode again after the resetting is completed, starting the gas mixing instrument and conveying another calibration gas II with different components into the detection chamber, wherein O in the calibration gas II 2 5% of NO, 200ppm of NO and the balance of N 2 Cycling for a period of time (about 15s or so), the standard sensor reading is stable, where O 2 Corresponding reading 5.6%, N 2 And reading the corresponding reading of 198ppm, and calibrating the sensor to be detected in the detection tank according to the reading.
In the circulating detection process, the air pressure in the first pipeline is 0.15MPa and is slightly larger than the pressure in the second pipeline (the air pressure in the second pipeline is 0.13MPa) for introducing air into the detection chamber, so that the first calibration gas is timely supplemented by the gas mixing instrument after the air pressure in the detection chamber is reduced, the air pressure and components of the first calibration gas in the detection chamber are stable, and the reduction of the air pressure in the detection chamber in the circulating process is caused by poor pipeline sealing and frequent plugging and pulling replacement of detection samples.
Example 2
The method for calibrating the nitrogen-oxygen sensor by using the gas distribution system comprises the following steps:
the reset mode is entered first: respectively inserting a standard sensor and a sensor to be detected into a standard sample groove and a detection groove, then opening an air pump, a valve I, a valve II and a valve III, closing a valve IV, and continuously pumping for a period of time (about 5min) until the reading value of the standard sensor is stable and unchanged, and then resetting;
then entering a cycle detection mode: keeping the opening state of the first valve and the third valve unchanged, closing the second valve, opening the fourth valve, simultaneously opening the gas mixing instrument to convey the second calibration gas into the detection chamber and keeping the opening state, and calibrating O in the second calibration gas 2 10% of NO, 500ppm of NO and the balance of N 2 Cycling for a period of time (about 15s or so), the standard sensor reading is stable, where O 2 Corresponding reading 10.5%, N 2 Reading corresponding to 490ppm, and calibrating the sensor to be detected in the detection tank according to the corresponding reading;
after the above-mentioned calibration is completed,closing the gas mixing instrument and the valve IV, opening the valve II, entering the reset mode again, pumping and exhausting the gas in the detection chamber and the circulating pipeline outwards (about 5min) to complete the reset, entering the circulating detection mode again after the reset is completed, opening the gas mixing instrument and conveying another calibration gas II with different components into the detection chamber, wherein O in the calibration gas II 2 8% of NO, 300ppm of NO and the balance of N 2 Cycling for a period of time (about 15s or so), the standard sensor reading is stable, where O 2 Corresponding reading 8.3%, N 2 Corresponding to a reading of 295ppm, the corresponding reading is taken and the sensor to be measured in the test tank is calibrated accordingly.
In the circulating detection process, the air pressure in the first pipeline is 0.18MPa and is slightly larger than the pressure in the second pipeline for introducing air into the detection chamber (the air pressure in the second pipeline is 0.15MPa), so that the calibration gas II is ensured to be supplemented by the gas mixer in time after the air pressure in the detection chamber is reduced, the air pressure and the components of the calibration gas II in the detection chamber are ensured to be stable, and the reduction of the air pressure in the detection chamber in the circulating process is caused by poor sealing of the pipeline and frequent plugging and unplugging replacement of a detection sample.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A gas distribution system for calibrating nitrogen oxide sensor comprises a gas distribution device 2 、N 2 Mix gas appearance (1) of thoughtlessly joining in marriage with three kinds of gas of NO, its characterized in that, the export of mixing gas appearance (1) is through the import intercommunication of pipeline (2) and tee bend (3), the export of tee bend (3) is through pipeline two (4) and detection room (6) import intercommunication just be equipped with valve (5) on pipeline two (4), the export of detection room (6) is through the import intercommunication of pipeline three (7) and tee bend two (9) just be equipped with air pump (8) on pipeline three (7), the export of tee bend two (9) is just with evacuation pipeline (10) intercommunication be equipped with valve two (11) on evacuation pipeline (10), the export of tee bend one (3) with the export of tee bend two (9) is through twoCirculating line (12) intercommunication, the one end that is close to tee bend one (3) on circulating line (12) is equipped with valve three (13), is close to the one end of tee bend two (9) is equipped with valve four (14), be equipped with a plurality of confession standard sensor male standard sample grooves and a plurality of confession sensor male detection groove that awaits measuring on detection room (6).
2. The gas distribution system for calibrating the nitrogen oxide sensor according to claim 1, wherein the first pipeline (2) and the second pipeline (4) are respectively provided with a pressure sensor for detecting the air pressure in the corresponding pipelines.
3. A gas distribution system for calibration of a nitrogen oxide sensor according to claim 1, characterized in that the number of the standard sample grooves on the detection chamber (6) is one, and the number of the detection grooves is multiple.
4. A valve train for calibration of a nox sensor according to claim 3, wherein the number of sensing slots is two.
5. A gas distribution system for calibration of a nitrogen oxide sensor according to any one of claims 1 to 4, characterized in that the first valve (5), the second valve (11), the third valve (13) and the fourth valve (14) are all electrically operated valves.
6. A method for nitrogen oxide sensor calibration, characterized in that, using the valve system of any one of claims 1 to 5, the method comprises the following steps:
the reset mode is entered first: respectively inserting a standard sensor and a sensor to be detected into a standard sample groove and a detection groove, then opening an air pump (8), a valve I (5), a valve II (11) and a valve III (13), closing a valve IV (14), continuously pumping for a period of time until the reading value of the standard sensor is stable and unchanged, and then resetting;
then entering a cycle detection mode: keeping the opening states of the first valve (5) and the third valve (13) unchanged, closing the second valve (11), opening the fourth valve (14), simultaneously opening the gas mixing instrument (1) to convey calibration gas into the detection chamber (6), keeping the gas mixing instrument (1) in the opening state, circulating for a period of time until the reading of the standard sensor is stable, reading corresponding reading and calibrating the sensor to be detected in the detection tank according to the reading;
after the primary calibration is finished, the gas mixing instrument (1) and the valve IV (14) are closed, the valve II (11) is opened, the resetting mode is entered again, the circular detection mode is entered again after the resetting is finished, the gas mixing instrument (1) is opened, and another calibration gas with different components is conveyed into the detection chamber (6) for calibration again.
7. The method for calibrating the nitrogen oxide sensor as recited in claim 6, wherein in the cycle detection mode, the air pressure in the first pipeline (2) is greater than the air pressure in the second pipeline (4).
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| CN112710788A (en) * | 2020-12-22 | 2021-04-27 | 尼特西普消防技术有限公司 | Point type combustible gas detector on-site calibration and detection device |
| CN113504361A (en) * | 2021-01-19 | 2021-10-15 | 广州瑞普医疗科技有限公司 | Automatic detection method and system |
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