CN113447617B - Aging method for nitrogen-oxygen sensor - Google Patents
Aging method for nitrogen-oxygen sensor Download PDFInfo
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- CN113447617B CN113447617B CN202110707121.XA CN202110707121A CN113447617B CN 113447617 B CN113447617 B CN 113447617B CN 202110707121 A CN202110707121 A CN 202110707121A CN 113447617 B CN113447617 B CN 113447617B
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Abstract
The invention provides an aging method for a nitrogen-oxygen sensor, belonging to the technical field of nitrogen-oxygen sensors and comprising the following steps: a plurality of probes of the nitrogen-oxygen sensor to be aged are placed in the gas pipeline; introducing aging gas into the gas pipeline, and monitoring the concentration of the aging gas in the gas pipeline in real time; after the gas pipeline reaches the first aging state, electrifying the nitrogen-oxygen sensor to be aged, and detecting the concentration of aging gas by the nitrogen-oxygen sensor to be aged within a first preset time; after the concentration is increased, the nitrogen-oxygen sensor continues to detect for a preset time; repeating the process until the nitrogen-oxygen sensor to be aged reaches an electrode gain stable state; by the aging method, the nitrogen oxygen sensor to be aged can reach an electrode gain stable state, and the accuracy and the stability of the nitrogen oxygen sensor are improved conveniently.
Description
Technical Field
The invention belongs to the technical field of nitrogen-oxygen sensors, and particularly relates to an aging method for a nitrogen-oxygen sensor.
Background
The nitrogen oxide sensor is capable of detecting the concentration of nitrogen oxides in the exhaust gas of the vehicle. In the production process of the nitrogen-oxygen sensor in the prior art, a probe of the nitrogen-oxygen sensor needs to be placed under the preset concentration of nitrogen oxide, the detection value of the nitrogen-oxygen sensor is corrected, and the corrected qualified nitrogen-oxygen sensor can be installed on a vehicle for use; however, the nitrogen-oxygen sensor produced just before is unstable in detecting the concentration of nitrogen oxides, and is easily mounted and used after being directly calibrated, thereby easily causing detection errors.
Disclosure of Invention
The embodiment of the invention provides an aging method for a nitrogen oxygen sensor, and aims to solve the technical problem that detection errors exist when the corrected nitrogen oxygen sensor is directly installed and used in the prior art.
The application provides an aging method applying the aging gas mixing system, which comprises the following steps:
a plurality of probes of the nitrogen-oxygen sensor to be aged are placed in the gas pipeline; starting an aging gas source to introduce aging gas into the gas pipeline, and monitoring the concentration of the aging gas in the gas pipeline in real time; when the concentration of aging gas in the gas pipeline is monitored to be a first preset concentration, the aging gas source is closed, and the gas pipeline reaches a first aging state; after the gas pipeline reaches the first aging state, electrifying the nitrogen-oxygen sensor to be aged, and detecting the concentration of aging gas by the nitrogen-oxygen sensor to be aged within a first preset time;
opening the aging gas source again, introducing aging gas into the gas pipeline, and monitoring the concentration of the aging gas in the gas pipeline in real time; when the concentration of the aging gas in the gas pipeline is monitored to be the next preset concentration, the aging gas source is closed, and the gas pipeline reaches the next aging state; in the aging state, detecting the concentration of an aging gas by the nitrogen-oxygen sensor to be aged in the next preset time;
repeatedly starting the aging gas source again, introducing aging gas into the gas pipeline, and monitoring the concentration of the aging gas in the gas pipeline in real time; when the concentration of the aging gas in the gas pipeline is monitored to be the next preset concentration, the aging gas source is closed, and the gas pipeline reaches the next aging state; and in the aging state, detecting the concentration of the aging gas by the to-be-aged nitrogen-oxygen sensor within the next preset time until the to-be-aged nitrogen-oxygen sensor reaches an electrode gain stable state.
In one possible implementation manner, during the power-on process of the nitrogen-oxygen sensor to be aged, the probe of the nitrogen-oxygen sensor to be aged is heated until the probe is heated to a preset temperature.
In some embodiments, the predetermined temperature is any temperature between 820 ℃ and 840 ℃.
In one possible implementation, the nitroxide sensor to be aged needs to detect the concentration of the aging gas in at least three aging states; the aging gas concentrations corresponding to the three aging states are respectively 500ppm, 1000ppm and 1500 ppm;
wherein, when the aging state is 500ppm, the preset time is 2 hours; when the aging state is 1000ppm, the preset time is 4 hours; when the aging state is 1500ppm, the preset time is 2 hours
In a possible implementation manner, in the process that the nitrogen-oxygen sensor to be aged detects the concentration of the aging gas, the concentration of the aging gas in the gas pipeline is finely adjusted in real time, so that the concentration of the aging gas in the gas pipeline is kept at a preset concentration.
In one possible implementation, the nitrogen oxide sensor to be aged is always in the energized state during the adjustment of the aging gas concentration in the gas line.
In one possible embodiment, part of the aging gas in the gas line is discharged when the concentration of the aging gas in the gas line is adjusted.
In one possible implementation manner, after the to-be-aged nitrogen oxygen sensor reaches the electrode gain stable state, the aging of the nitrogen oxygen sensor is stopped, and the gas pipeline is flushed.
In one possible implementation, the flushing process is: introducing air into the gas pipeline, and monitoring the concentration of aging gas in the gas pipeline in real time; and when the concentration of the aging gas in the gas pipeline is zero, stopping introducing air into the gas pipeline.
In one possible implementation, the aging gas in the gas pipeline flows back and forth circularly during the aging process of the nitrogen-oxygen sensor.
Compared with the prior art, the aging method for the nitrogen-oxygen sensor can enable the nitrogen-oxygen sensor to be aged to reach an electrode gain stable state, and is convenient for improving the precision and stability of the nitrogen-oxygen sensor.
Drawings
FIG. 1 is a schematic diagram of an aging air mixing system according to an embodiment of the present invention;
FIG. 2 is a graph of the sensing current of a NOx sensor of an aging method according to an embodiment of the present invention as a function of time;
FIG. 3 is a graph of data measured by the method at 830 ℃ for a probe of a nitrogen oxygen sensor of an aging method provided by an embodiment of the invention;
FIG. 4 is data measured by aging a probe of a nitrogen oxygen sensor in air at 830 ℃ according to an aging method provided by an embodiment of the invention;
FIG. 5 is a graph of data measured by the method at 800 ℃ for a probe of a nitrogen oxygen sensor of an aging method provided by an embodiment of the invention;
FIG. 6 is data measured by aging a probe of a nitrogen oxygen sensor in air at 800 ℃ according to an aging method provided by an embodiment of the invention.
Description of reference numerals: 1. a gas line; 2. an aging gas source; 21. a second solenoid valve; 22. a surge tank; 23. a first solenoid valve; 3. a detection chamber; 31. a standard nitrogen oxygen sensor; 4. a gas circulation line; 41. an air intake section; 42. a gas return section; 43. an exhaust solenoid valve; 44. a working electromagnetic valve; 5. a power mechanism; 51. a first chamber; 52. a second chamber; 53. a cylinder; 54. a lead screw motor.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, an aging gas mixing system according to the present invention will now be described. The aging gas mixing system comprises a gas pipeline 1, an aging gas source 2, a detection chamber 3 and a control module; the gas pipeline 1 is provided with a plurality of mounting holes suitable for placing probes of the nitrogen-oxygen sensor to be aged; the aging gas source 2 is communicated with the gas pipeline 1; the detection chamber 3 is communicated with the gas pipeline 1, and a standard nitrogen-oxygen sensor 31 suitable for detecting the concentration of the aging gas is arranged in the detection chamber 3; the control module is electrically connected with the standard nitrogen-oxygen sensor 31; the control module is used for controlling the on-off of the aging gas source 2 and the gas pipeline 1; wherein, the gas pipeline 1 is internally provided with a plurality of aging states with preset aging gas concentration; the standard nitrogen-oxygen sensor 31 is used for detecting the concentration of the aging gas and generating a detection signal; the control module receives the detection signal and controls the on-off of the gas pipeline 1 and the aging gas source 2 so as to enable the interior of the gas pipeline 1 to reach an aging state; the control module controls the on-off of the gas pipeline 1 and the aging gas source 2 after the preset time so as to enable the next aging state in the gas pipeline 1 to be achieved.
In the embodiment of the application, a nitrogen oxygen sensor to be aged can be installed in an installation hole on a gas pipeline 1, and an aging gas source 2 can provide aging gas into the gas pipeline 1; because the detection chamber 3 is communicated with the gas pipeline 1, the concentration of the aging gas in the gas pipeline 1 can be reflected by the detection value of the standard nitrogen-oxygen sensor 31 to the detection chamber 3, compared with the mode that the standard nitrogen-oxygen sensor 31 is arranged in the gas pipeline 1, the space of the detection chamber 3 is smaller than that of the gas pipeline 1, and the standard nitrogen-oxygen sensor 31 is arranged in the detection chamber 3, so that the measurement error can be reduced, and the measurement result is more accurate; the control module can control the air inflow in the gas pipeline 1 according to the detection numerical value of the standard nitrogen-oxygen sensor 31, and the concentration in the gas pipeline 1 can reach the concentration of the preset aging gas.
Compared with the prior art, the aging gas mixing system provided by the invention can age the nitrogen-oxygen sensor which is just produced through the cooperation of the gas pipeline 1, the aging gas source 2, the detection chamber 3, the standard nitrogen-oxygen sensor 31 and the control module, so that the nitrogen-oxygen sensor reaches an electrode gain stable state, and the detection precision and stability of the nitrogen-oxygen sensor are improved conveniently.
In some embodiments, as shown in fig. 1, the gas pipeline 1 has a plurality of aging states with preset aging gas concentrations, and the corresponding gas concentrations of the plurality of aging states are arranged along a gradient; the plurality of aging states can be set in an increasing mode or in a decreasing mode; when the aging states are gradually increased, the initial aging state in the gas pipeline 1 is the aging state with the minimum aging gas concentration, and after the preset time, the aging states in the gas pipeline 1 sequentially change towards the concentration increasing direction; when the aging states are gradually decreased, the initial aging state in the gas pipeline 1 is the aging state with the maximum aging gas concentration, and after the preset time, the aging states in the gas pipeline 1 sequentially change towards the direction of reducing the concentration; the probe of the nitrogen-oxygen sensor is hermetically arranged with the gas pipeline 1.
In some embodiments, as shown in fig. 1, the aging gas mixing system further includes a surge tank 22, the aging gas source 2 is communicated with the surge tank 22, and the surge tank 22 is communicated with the gas pipeline 1 through a pipeline; a first electromagnetic valve 23 is arranged between the pressure stabilizing tank 22 and the gas pipeline 1, a second electromagnetic valve 21 is arranged between the pressure stabilizing tank 22 and the aging gas source 2, and both the first electromagnetic valve 23 and the second electromagnetic valve 21 are electrically connected with the control module; the pressure stabilizing tank 22 is provided with a pressure sensor which is electrically connected with the control module; the pressure sensor is used for detecting the pressure of the aging gas in the surge tank 22 and generating a pressure signal, and the control module receives the pressure signal and controls the on-off of the second electromagnetic valve 21; when the concentration in the gas pipeline 1 needs to be adjusted, the second battery valve is opened, the first electromagnetic valve 23 is closed, the aging gas source 2 fills the aging gas into the surge tank 22, after the gas pressure in the surge tank 22 reaches a preset pressure, the control module controls the second electromagnetic valve 21 to be closed, the first electromagnetic valve 23 to be opened, and the aging gas in the surge tank 22 enters the gas pipeline 1; when the gas concentration in the gas pipeline 1 reaches the preset concentration, the control module controls the first electromagnetic valve 23 to be closed.
It should be noted that there are at least three surge tanks 22, the gases in the three surge tanks 22 are air, nitrogen oxide gas and oxygen respectively, and the aging gas source is nitrogen oxide gas and oxygen; the nitrogen-oxygen sensor can detect the concentration of nitrogen oxide and can also detect the concentration of oxygen, so that oxygen is introduced into the gas pipeline 1 to ensure the concentration of nitrogen oxide, two detection electrodes of the nitrogen-oxygen sensor can generate detection current, and the aging effect of nitrogen oxide is improved conveniently; after the nitrogen-oxygen sensor is aged, the gas pipeline 1 needs to be flushed by air, so that residual nitrogen oxide gas in the gas pipeline 1 is avoided.
Specifically, as shown in fig. 1, the aging gas mixing system further comprises a warning lamp, and the warning lamp is electrically connected with the control module; when the pressure in the surge tank 22 exceeds the preset pressure, the control module controls an alarm lamp to give an alarm; the alarm lamp is used for alarming, the condition that the pressure in the surge tank 22 exceeds the standard can be known in time, the operator can take measures in time, and the potential safety hazard is reduced.
In some embodiments, as shown in fig. 1, the aging gas mixing system further includes a gas circulation pipeline 4 and a power mechanism 5, both ends of the gas circulation pipeline 4 are communicated with the gas pipeline 1, and the aging gas source 2 and the detection chamber 3 are communicated with the gas circulation pipeline 4; the power mechanism 5 is arranged on the gas circulation pipeline 4, and the power mechanism 5 is used for providing power for the aging gas in the gas circulation pipeline 4 so as to enable the aging gas in the gas pipeline 1 to circularly reciprocate; through the gaseous reciprocating motion of ageing in the drive gas pipeline 1 of power unit 5, can make the gaseous distribution of ageing in the gas pipeline 1 more even on the one hand, on the other hand can simulate the state that the vehicle discharged tail gas, and the nitrogen oxygen sensor of being convenient for detects ageing gaseous concentration.
Specifically, as shown in fig. 1, the detection chamber 3 is provided on the gas circulation line 4 and communicates with the gas circulation line 4; the aging gas can pass through the detection chamber 3 while the aging gas is cyclically reciprocated, thereby facilitating the detection of the concentration of the aging gas by the standard nitroxide sensor 31 in the detection chamber 3.
Specifically, as shown in fig. 1, both ends of the gas circulation line 4 are respectively communicated with both ends of the gas line 1; the gas circulation pipeline 4 comprises a gas inlet section 41 and a gas return section 42, and the power mechanism 5 is provided with a first chamber 51 communicated with the gas inlet section 41 and a second chamber 52 communicated with the gas return section 42; the power mechanism 5 comprises an adjustment assembly adapted to adjust the volume of the first chamber 51 and the second chamber 52; the first chamber 51 and the second chamber 52 are separated by a partition, which is slidable within the first chamber 51 and the second chamber 52; the adjusting assembly is provided with a driving end suitable for driving the clapboard to slide; the driving end drives the partition plate to slide in the first cavity 51 and the second cavity 52, so that the volume of the first cavity 51 and the volume of the second cavity 52 are changed in a reverse direction, aging gas enters the second cavity 52 from the first cavity 51 through the gas inlet section 41, the gas pipeline 1 and the gas return section 42, or aging gas enters the first cavity 51 from the second cavity 52 through the gas return section 42, the gas pipeline 1 and the gas inlet section 41, and accordingly cyclic reciprocating motion of the aging gas can be achieved.
It should be noted that, as shown in fig. 1, the power mechanism 5 includes a cylinder 53, the first chamber 51 and the second chamber 52 are two chambers of the cylinder 53, the partition is a piston of the cylinder 53, the adjusting assembly includes a lead screw motor 54, and a sliding end of the lead screw motor 54 is fixedly connected to a piston rod of the cylinder 53, so that the lead screw motor 54 can drive the piston rod to extend and retract, thereby facilitating the aging gas to circularly reciprocate in the gas pipeline 1.
Specifically, as shown in fig. 1, the air return section 42 of the gas circulation pipeline 4 is provided with an exhaust solenoid valve 43, and the exhaust solenoid valve 43 is electrically connected with the control module; the air inlet section 41 and the air return section 42 are both provided with working electromagnetic valves 44, and the working electromagnetic valves 44 are electrically connected with the control module; when the gas pipeline 1 is subjected to primary gas inlet, nitrogen oxide gas and oxygen are required to be introduced into the gas pipeline 1, and meanwhile, the screw motor 54 is started to enable the aging gas in the gas pipeline 1 to circularly reciprocate; stopping ventilation into the gas pipeline 1 when the concentration in the gas pipeline 1 reaches a preset concentration; then electrifying the nitrogen-oxygen sensor to be aged, so that the nitrogen-oxygen sensor starts to detect the concentration in the gas pipeline 1, namely, the nitrogen-oxygen sensor starts to be aged; in the aging process, the working electromagnetic valves 44 of the air inlet section 41 and the air return section 42 are both in an open state, and meanwhile, the screw motor 54 is also in an open state all the time; according to the detection signal of the standard nitrogen-oxygen sensor 31, the control module controls the first electromagnetic valve 23 in real time to ensure that the concentration in the gas pipeline 1 is the preset concentration.
After the preset time, the concentration in the gas pipeline 1 needs to be adjusted upwards, at the moment, the nitrogen-oxygen sensor is continuously electrified, and the nitrogen-oxygen sensor cannot be influenced in the concentration adjusting process; when the concentration in the gas line 1 is adjusted upward, the exhaust solenoid valve 43 needs to be opened to exhaust a small amount of gas in the gas line 1.
After the aging process is finished, introducing air into the gas pipeline 1, circulating the air in the gas pipeline 1 for one minute, and then exhausting the gas in the gas pipeline 1 through the exhaust electromagnetic valve 43; the above operations are repeated until all the solenoid valves are closed after the standard nitroxide sensor 31 detects that the gas in the system is air.
Based on the same inventive concept, the embodiment of the application also provides an aging control system, which comprises the aging gas mixing system and a display module, wherein the control module is electrically connected with the display module and the nitrogen-oxygen sensor to be aged; the display module is used for displaying the aging time of the nitrogen oxygen sensor to be aged and displaying the detection state of the nitrogen oxygen sensor to be aged.
Compared with the prior art, the aging control system provided by the invention has the advantages that the aging time and the detection state of the nitrogen oxygen sensor to be aged are displayed through the display module, and the aging progress of the nitrogen oxygen sensor can be intuitively known.
The control module can control the number of the started nitrogen oxygen sensors to be aged, and can avoid the situation of overhigh load caused by the simultaneous starting of the nitrogen oxygen sensors to be aged; the aging control system also comprises a storage module which can store the aging time of the nitrogen-oxygen sensor; the control module can control the storage module to clear the aging time.
Based on the same inventive concept, the embodiment of the application also provides an aging method for the nitrogen oxygen sensor, which comprises the following steps: a plurality of probes of the nitrogen-oxygen sensor to be aged are placed in the gas pipeline 1; starting an aging gas source 2 to introduce aging gas into the gas pipeline 1, and monitoring the concentration of the aging gas in the gas pipeline 1 in real time; when the concentration of the aging gas in the gas pipeline 1 is monitored to be a first preset concentration, the aging gas source 2 is closed, and the gas pipeline 1 reaches a first aging state; after the gas pipeline 1 reaches the first aging state, the nitrogen oxygen sensor to be aged is electrified, and in a first preset time, the nitrogen oxygen sensor to be aged detects the concentration of aging gas.
The aging gas source 2 is started again, aging gas is introduced into the gas pipeline 1, and the concentration of the aging gas in the gas pipeline 1 is monitored in real time; when the concentration of the aging gas in the gas pipeline 1 is monitored to be the next preset concentration, the aging gas source 2 is closed, and the gas pipeline 1 reaches the next aging state; in the aging state, the nitrogen oxygen sensor to be aged detects the concentration of the aging gas in the next preset time.
Repeatedly starting the aging gas source 2 again, introducing aging gas into the gas pipeline 1, and monitoring the concentration of the aging gas in the gas pipeline 1 in real time; when the concentration of the aging gas in the gas pipeline 1 is monitored to be the next preset concentration, the aging gas source 2 is closed, and the gas pipeline 1 reaches the next aging state; and in the aging state, detecting the concentration of the aging gas by the to-be-aged nitrogen-oxygen sensor within the next preset time until the to-be-aged nitrogen-oxygen sensor reaches an electrode gain stable state.
Compared with the prior art, the aging method for the nitrogen-oxygen sensor can enable the nitrogen-oxygen sensor to be aged to reach an electrode gain stable state, and is convenient for improving the precision and stability of the nitrogen-oxygen sensor.
In some embodiments, during the power-on process of the nitrogen-oxygen sensor to be aged, the probe of the nitrogen-oxygen sensor to be aged is heated until the probe is heated to a preset temperature; the preset temperature is any temperature between 820 ℃ and 840 ℃; the probe of the nitrogen-oxygen sensor is heated, and the working environment of the nitrogen-oxygen sensor can be simulated.
Specifically, the preset temperature is preferably 830 ℃.
In some embodiments, the nitroxide sensor to be aged is required to detect the concentration of the aging gas in at least three aging states; the aging gas concentrations corresponding to the three aging states are respectively 500ppm, 1000ppm and 1500 ppm; wherein, when the aging state is 500ppm, the preset time is 2 hours; when the aging state is 1000ppm, the preset time is 4 hours; when the aging state is 1500ppm, the preset time is 2 hours; the range between the two dotted lines in fig. 2 is the stable range of the electrode gain of the nox sensor, and the electrode gain of the nox sensor can be maintained in a stable state for 8 hours (i.e., t1 time) by the aging process; the nitrogen oxygen sensor is placed in the air for aging, and 5 days (namely t2 time) are needed to keep the electrode gain of the nitrogen oxygen sensor in a stable state; therefore, the aging method can improve the aging efficiency.
In some embodiments, during the process of detecting the concentration of the aging gas by the nitrogen-oxygen sensor to be aged, the concentration of the aging gas in the gas pipeline 1 is finely adjusted in real time so that the concentration of the aging gas in the gas pipeline 1 is maintained at the preset concentration.
In some embodiments, during the adjustment of the aging gas concentration in the gas pipeline 1, the nitrogen oxygen sensor to be aged is always in the power-on state; in the process of increasing the concentration of the aging gas in the gas line 1, the time of the concentration increase process is short, and therefore, the aging process of the nitrogen oxygen sensor is not affected by maintaining the energization state of the nitrogen oxygen sensor.
In some embodiments, when the concentration of the aging gas in the gas pipeline 1 is adjusted, a part of the aging gas in the gas pipeline 1 is discharged, so that the pressure in the gas pipeline 1 can be kept stable.
When the gas pipe 1 is exhausted, a small amount of exhaust gas may be performed, and the concentration ratio of the nitrogen oxide gas to the oxygen gas in the gas pipe 1 may be the same.
In some embodiments, after the nitroxide sensor to be aged reaches the electrode gain steady state, the aging of the nitroxide sensor is stopped and the gas line 1 is flushed; the washing process comprises the following steps: introducing air into the gas pipeline 1, and monitoring the concentration of the aging gas in the gas pipeline 1 in real time; when the concentration of the aging gas in the gas pipeline 1 is zero, stopping introducing air into the gas pipeline 1; after the gas pipeline 1 is flushed, the next aging test can be directly performed conveniently.
In some embodiments, in the aging process of the nitrogen oxygen sensor, the aging gas in the gas pipeline 1 flows back and forth in a circulating manner, so that the aging gas in the gas pipeline 1 is more uniform, and the effect of the aging process of the nitrogen oxygen sensor is improved conveniently.
As shown in fig. 3 and 4, the probe of the nitrogen-oxygen sensor can make the deviation of the nitrogen-oxygen sensor about one percent in 8 hours by the aging method of the application at 830 ℃; aging in air requires 120 hours (i.e., 5 days) to achieve a% deviation of the nox sensor.
As shown in fig. 5 and 6, the probe of the nitrogen-oxygen sensor has a deviation of about ten percent at 800 ℃ by the aging method of the present application; aging in air for 120 hours, wherein the deviation of the nitrogen-oxygen sensor is about ten percent; if the deviation is to be controlled to about one percent, a longer time is required.
In conclusion, when the probe of the nitrogen-oxygen sensor is at 830 ℃, the aging method in the application can enable the deviation of the nitrogen-oxygen sensor to be about one percent in 8 hours, and compared with experimental data of other conditions, the probe of the nitrogen-oxygen sensor can enable the nitrogen-oxygen sensor to be aged to reach an electrode gain stable state in a short time, so that the accuracy and the stability of the nitrogen-oxygen sensor are improved conveniently.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An aging method for a nitrogen oxygen sensor, characterized by comprising the steps of:
a plurality of probes of the nitrogen-oxygen sensor to be aged are placed in the gas pipeline; starting an aging gas source to introduce aging gas into the gas pipeline, and monitoring the concentration of the aging gas in the gas pipeline in real time; when the concentration of aging gas in the gas pipeline is monitored to be a first preset concentration, the aging gas source is closed, and the gas pipeline reaches a first aging state; after the gas pipeline reaches the first aging state, electrifying the nitrogen-oxygen sensor to be aged, and detecting the concentration of aging gas by the nitrogen-oxygen sensor to be aged within a first preset time;
opening the aging gas source again, introducing aging gas into the gas pipeline, and monitoring the concentration of the aging gas in the gas pipeline in real time; when the concentration of the aging gas in the gas pipeline is monitored to be the next preset concentration, the aging gas source is closed, and the gas pipeline reaches the next aging state; in the aging state, detecting the concentration of an aging gas by the nitrogen-oxygen sensor to be aged in the next preset time;
repeatedly starting the aging gas source again, introducing aging gas into the gas pipeline, and monitoring the concentration of the aging gas in the gas pipeline in real time; when the concentration of the aging gas in the gas pipeline is monitored to be the next preset concentration, the aging gas source is closed, and the gas pipeline reaches the next aging state; and in the aging state, detecting the concentration of the aging gas by the to-be-aged nitrogen-oxygen sensor within the next preset time until the to-be-aged nitrogen-oxygen sensor reaches an electrode gain stable state.
2. The aging method for a nitrogen oxygen sensor according to claim 1, wherein a probe of the nitrogen oxygen sensor to be aged is heated until a preset temperature is reached during energization of the nitrogen oxygen sensor to be aged.
3. The aging method for a nitrogen oxygen sensor according to claim 2, wherein the preset temperature is any temperature between 820 ℃ and 840 ℃.
4. The aging method for a nitrogen oxide sensor according to claim 1, wherein the nitrogen oxide sensor to be aged is required to detect the concentration of an aging gas in at least three aging states; the aging gas concentrations corresponding to the three aging states are respectively 500ppm, 1000ppm and 1500 ppm;
wherein, when the aging state is 500ppm, the preset time is 2 hours; when the aging state is 1000ppm, the preset time is 4 hours; when the aging state is 1500ppm, the preset time is 2 hours.
5. The aging method for a nitrogen oxide sensor according to claim 1, wherein the concentration of the aging gas in the gas pipeline is finely adjusted in real time during the detection of the concentration of the aging gas by the nitrogen oxide sensor to be aged, so that the concentration of the aging gas in the gas pipeline is maintained at a preset concentration.
6. The aging method for a nitrogen oxide sensor according to claim 5, wherein the nitrogen oxide sensor to be aged is always in an energized state during adjustment of the aging gas concentration in the gas line.
7. The aging method for a nitrogen oxygen sensor according to claim 5, wherein a part of the aging gas in the gas line is discharged while adjusting the concentration of the aging gas in the gas line.
8. The aging method for a NOx sensor of claim 1, wherein after the NOx sensor to be aged reaches an electrode gain steady state, the aging of the NOx sensor is stopped and the gas line is flushed.
9. The aging method for a nitrogen oxygen sensor according to claim 8, wherein the rinsing process is: introducing air into the gas pipeline, and monitoring the concentration of aging gas in the gas pipeline in real time; and when the concentration of the aging gas in the gas pipeline is zero, stopping introducing air into the gas pipeline.
10. The method of any one of claims 1 to 9, wherein the aging gas in the gas line is circulated during the aging of the nitroxide sensor.
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| JP4760806B2 (en) * | 2007-09-04 | 2011-08-31 | 株式会社デンソー | Gas sensor degradation simulator |
| JP2012082710A (en) * | 2010-10-07 | 2012-04-26 | Toyota Motor Corp | Degradation detection system for nox sensor |
| CN203414450U (en) * | 2013-07-12 | 2014-01-29 | 河南汉威电子股份有限公司 | Automatic calibration system of gas sensor |
| CN104808131A (en) * | 2015-04-30 | 2015-07-29 | 湖北丹瑞新材料科技有限公司 | Aging testing device and aging testing method for chip of nitrogen and oxygen sensor |
| CN208420866U (en) * | 2018-08-01 | 2019-01-22 | 北京卡达克汽车检测技术中心有限公司 | A kind of nitrogen oxide sensor and lambda sensor Fast Calibration system |
| CN109358280A (en) * | 2018-09-28 | 2019-02-19 | 宁波安创电子科技有限公司 | A kind of nitrogen oxide sensor chip ageing test device |
| CN110865152A (en) * | 2019-11-28 | 2020-03-06 | 天地（常州）自动化股份有限公司 | Gas sensor aging device for coal mine and detection method |
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