Method for correcting aging of nitrogen-oxygen sensor

Abstract

The invention relates to an aging correction method for a nitrogen-oxygen sensor, which comprises the following steps of: measuring and calculating an aging correction coefficient, archiving the aging correction coefficient into an aging correction module, and extracting data in real time by using the aging correction module, so that the output value of the nitrogen-oxygen sensor is corrected, and after a probe is aged, the output value of the nitrogen-oxygen sensor is corrected. A relatively accurate numerical value can still be output, namely, aging of a probe is offset by using a correction part, an aging correction coefficient can be obtained by looking up a table in combination with accumulated working time, accumulated driving mileage and daily driving working conditions after the nitrogen-oxygen sensor is loaded and parameters such as NOx and O2 concentrations measured for a long time, and the value is multiplied by an output coefficient, so that the aging correction coefficient is obtained. And the output precision can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of nitrogen oxygen concentration detection, and in particular to a method for correcting aging of a nitrogen oxygen sensor. Background Art

[0002] At present, due to the current status of ceramic chip technology, nitrogen oxide sensors generally experience accuracy drift after a certain period of use, that is, the problem of reduced measurement accuracy. This problem not only affects the measurement accuracy of the nitrogen oxide sensor in the later stage, affects the vehicle's judgment of nitrogen oxide concentration, but also directly leads to the life of the nitrogen oxide sensor.

[0003] The factors affecting aging are as follows:

[0004] 1. When the ceramic chip is used for a long time, particles will accumulate on the surface of the platinum electrode, resulting in poor surface activity and affecting the measurement accuracy.

[0005] 2. If the nitrogen and oxygen sensor has not been used for a long time, moisture and oil will adhere to the ceramic chip chamber, affecting the measurement. Generally, it can be restored after a few hours of use.

[0006] 3. The daily heating and temperature control of the ceramic chip will also affect the measurement accuracy of the NOx sensor after a long period of time.

[0007] Patent application number CN202010690122.3 discloses a nitrogen oxide sensor correction method that is adaptive to exhaust gas parameters, which detects exhaust gas in real time through a nitrogen oxide sensor to obtain the actual measured concentration of NOX; the nitrogen oxide sensor receives the NO2 concentration, NH3 concentration, and back pressure parameters in the exhaust gas sent by the ECU; the nitrogen oxide sensor corrects the actual measured concentration of NOX according to the NO2 concentration, NH3 concentration, and back pressure parameters to obtain the NOX corrected concentration; the nitrogen oxide sensor sends the NOX corrected concentration to the ECU to control the urea injection amount. The nitrogen oxide sensor NO2 concentration, NH3 concentration, and back pressure parameters of the present invention actively and adaptively correct the NOX corrected concentration and send it to the ECU, eliminating the work of the ECU completing the correction calculation in the existing solution, and effectively overcoming the shortcomings of the existing technical solution, such as complex calibration, unclear responsibilities, and high comprehensive development costs. However, this method has the following problems: First, the data based on how to correct the concentration cannot be supported; second, it does not take into account the different aging degrees of the nitrogen oxide sensor under different conditions, different temperatures, and different mileages, and the correction module has low accuracy;

[0008] Patent application number: 202111626112.4 discloses a method and device for detecting the accuracy of a NOx sensor, which detects a first concentration value of nitrogen oxides through a NOx sensor. If a first difference between the first concentration value and a corrected reference concentration value is greater than a first preset threshold value and not greater than a second preset threshold value, the urea injection amount is increased and the first concentration value of nitrogen oxides is redetected; wherein the corrected reference concentration value is obtained by correcting a pre-stored reference concentration value of nitrogen oxides based on an engine aging factor, and the engine aging factor is determined based on the total running time of the engine; if the first difference between the first concentration value and the corrected reference concentration value is not greater than a first preset threshold value, it is determined that the accuracy of the NOx sensor meets the first accuracy value, so that the NOx sensor can be used to accurately measure the concentration of nitrogen oxides, but this method has the following problems: First, the aging degree of the engine is taken into account, but the aging of the ceramic chip is not considered to affect the detection accuracy; secondly, different vehicle conditions are not considered to affect the aging detection accuracy. Summary of the invention

[0009] The purpose of the present invention is to address the shortcomings of the prior art and, through auxiliary conditions, correct the output value of the nitrogen oxygen sensor so that it can still output relatively accurate values ​​after the probe ages, that is, use the correction part to offset the aging of the probe, thereby solving the technical problems of low correction accuracy and unreasonable experimental data in different usage scenarios in the prior art.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A method for correcting aging of a nitrogen oxide sensor comprises step S1: preparing six groups of fleets of different brands, each group of fleets having ten vehicles of the same brand, model and specification, installing nitrogen oxide sensors to be tested, and measuring NOx and O2 concentration accuracy data (compared to a benchmark) of the nitrogen oxide sensors to be tested before installation;

[0012] Step S2: after every 50,000 kilometers of vehicle travel, record the cumulative working time, cumulative mileage and daily driving conditions of the nitrogen oxide sensor after installation, and measure the NOx and O2 concentration accuracy data of the nitrogen oxide sensor installed thereon (compared to the benchmark);

[0013] Step S3: After the vehicle has traveled 600,000 kilometers, the data is summarized;

[0014] Step S4: Calculate the aging correction coefficient through the correction calculation module (combined with the running mileage), and formulate the parameter by comprehensively considering the differences between different samples;

[0015] Accuracy deviation requirements: NOx: ≤10%, 02: ≤5% (5-21%) or ≤0.15% (0-5%). If it is within this range, the accuracy of the nitrogen oxide sensor meets the requirements.

[0016] NOx test range: 0~2500ppm, 02 test range: -12%~21%;

[0017] Step S5: measuring the NOx and O2 concentration parameters of the test vehicle after the nitrogen oxygen sensor that needs to be newly measured is installed;

[0018] Step S6: The data measured in step S5 is multiplied by the aging correction coefficient in step S4 and outputted;

[0019] Step S7: The output value is compared with the accuracy requirement range of NOx: 0~2500ppm, 02: -12%~21% set by the vehicle. If it is within the range, no maintenance is required. If it is not within the range, the vehicle ECU reports a fault.

[0020] As a preferred embodiment, in step S5, when the test vehicle to be newly measured has been left to stand for more than or equal to 30 days after the nitrogen oxygen sensor is installed, when it is used again, it needs to be multiplied by the aging correction factor within less than 2 hours before being output, and the measured NOx and O2 concentration parameters can be directly output within more than or equal to 2 hours.

[0021] As a preferred embodiment, different degrees of driving aging will occur in different mileages in step S2, and the driving aging coefficient is measured using the control variable method. For vehicles with different mileage, the current NOx and O2 concentration parameters are multiplied by the aging correction coefficient when measured, and then multiplied by the driving aging coefficient. The deviation requirements are NOx: ≤10%, 02: ≤5% (5~21%) or ≤0.15% (0~5%). If it is within this range, the accuracy of the nitrogen oxide sensor meets the requirements.

[0022] As a preferred embodiment, the daily driving conditions in step S2 include low speed, medium speed, high speed, overspeed and idle speed, low speed is 0-60km / h, medium speed is 60-100km / h, high speed is 100-120km / h, overspeed is above 120km / h, and idle speed is the state where the internal combustion engine is in no-load state and the engine runs at the lowest stable speed.

[0023] As a preferred embodiment, the correction calculation module in step S4 is that after the nitrogen oxide sensor is installed, the parameters of NOx and O2 concentrations are recorded under different mileages, the same driving conditions and the same working time for the same vehicle, and then the parameters actually measured after the nitrogen oxide sensor is disassembled are recorded; the parameters of NOx and O2 concentrations are recorded under different driving conditions, the same mileage and the same working time, and then the parameters actually measured after the nitrogen oxide sensor is disassembled are recorded; the parameters of NOx and O2 concentrations are recorded under different working times, the same driving conditions and the same mileage, and then the parameters actually measured after the nitrogen oxide sensor is disassembled are recorded.

[0024] As a preferred embodiment, the actual parameters measured are compared with corresponding parameters measured by the vehicle under control variables, so as to calculate an aging correction parameter table that meets the requirements of the working time of the test vehicle after the newly measured nitrogen oxide sensor is installed in the corresponding range, the corresponding mileage and the corresponding driving conditions, and the aging correction coefficient is extracted using the correction calculation module and the aging correction parameter table entered in advance.

[0025] As a preference, in step S2, the nitrogen oxide sensor includes a ceramic chip, and when the nitrogen oxide sensor is working, the temperature of the ceramic chip is stably controlled at a target temperature (generally at 800 degrees Celsius).

[0026] As a preferred embodiment, the temperature of the ceramic chip will fluctuate within the target temperature range when it is working, resulting in insufficient output accuracy. Therefore, the variable conditions are controlled to be consistent by using the method of controlling variables, and the output values ​​under different temperature fluctuations are measured. Then, the values ​​measured by the nitrogen oxide sensor under the same conditions at the same post-processing system ambient temperature are used, and the ceramic chip aging correction coefficient table is obtained by comparing the two values.

[0027] As another preferred embodiment, the correction calculation module in step S4 includes an aging correction coefficient table, a driving aging coefficient table and a ceramic chip aging correction coefficient table.

[0028] Beneficial effects of the present invention:

[0029] (1) In the present invention, the control variable method is used to conduct tests under different conditions using ten vehicles of the same brand, specification and displacement. First, the test values ​​of the nitrogen oxide sensor to be installed are recorded. Then, after the nitrogen oxide sensor is installed, the same driving condition, the same mileage, and different working time are tested as a group. The same driving condition, the same working time and different mileage are tested as a group. The different driving conditions, the same working time and the same mileage are tested as a group. Then, the installed nitrogen oxide sensor is disassembled and tested using the post-ambient temperature simulation. The three groups of values ​​are obtained and compared with the test values ​​of the nitrogen oxide sensor not installed on the vehicle, thereby obtaining an aging correction coefficient table.

[0030] (2) In the present invention, the driving aging coefficient is measured. The driving aging coefficient is a comparison of the aging degree of the engine at different mileages. The value measured under the same driving conditions and the same working time is the driving aging coefficient. In addition, the driving aging coefficient is related to the engine of the vehicle. The greater the mileage, the higher the driving aging degree. This is an irreversible value under working conditions. Therefore, when correcting the coefficient, it is necessary to multiply the aging correction coefficient and then multiply it by the driving aging coefficient, so as to obtain a more accurate value.

[0031] (3) In the present invention, the influence on the ceramic chip measurement is obtained through comprehensive analysis based on the daily working temperature fluctuation of the nitrogen oxide sensor and the ambient temperature of the post-processing system, and the aging correction coefficient can be obtained by looking up the table. The output accuracy can be improved by multiplying the output coefficient by this value, because the more stable the temperature of the ceramic chip, the more accurate the output. If the temperature fluctuates, the output accuracy will decrease. In addition, the ceramic chip will maintain a temperature between 790-820 degrees Celsius. For example, the output is accurate at 800 degrees Celsius. If the temperature of the ceramic chip is 795 degrees Celsius for a while and 805 degrees Celsius for a while, the output accuracy will be greatly reduced. It is necessary to involve the aging correction coefficient of the ceramic chip to make the overall output accuracy higher.

[0032] In summary, this method has the advantages of correcting the output value of the nitrogen oxide sensor, accurately outputting the value, and reducing the number of repairs and maintenance, and is particularly suitable for the field of nitrogen oxide concentration detection technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0034] Figure 1It is a schematic diagram of the overall framework flow of the present invention. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings.

[0036] Embodiment 1

[0037] like Figure 1 As shown, the present invention provides a method for aging correction of nitrogen oxide sensors, comprising step S1: preparing six groups of fleets of different brands, each group of fleets having ten vehicles of the same brand, model and specification, installing nitrogen oxide sensors to be tested, and measuring NOx and O2 concentration accuracy data of the nitrogen oxide sensors to be tested (compared to a benchmark) before installation;

[0038] Step S2: after every 50,000 kilometers of vehicle travel, record the cumulative working time, cumulative mileage and daily driving conditions of the nitrogen oxide sensor after installation, and measure the NOx and O2 concentration accuracy data of the nitrogen oxide sensor installed thereon (compared to the benchmark);

[0039] Step S3: After the vehicle has traveled 600,000 kilometers, the data is summarized;

[0040] Step S4: Calculate the aging correction coefficient through the correction calculation module (combined with the running mileage), and formulate the parameter by comprehensively considering the differences between different samples;

[0041] Accuracy deviation requirements: NOx: ≤10%, 02: ≤5% (5-21%) or ≤0.15% (0-5%). If it is within this range, the accuracy of the nitrogen oxide sensor meets the requirements.

[0042] NOx test range: 0~2500ppm, 02 test range: -12%~21%;

[0043] Step S5: measuring the NOx and O2 concentration parameters of the test vehicle after the nitrogen oxygen sensor that needs to be newly measured is installed;

[0044] Step S6: The data measured in step S5 is multiplied by the aging correction coefficient in step S4 and outputted;

[0045] Step S7: The output value is compared with the accuracy requirement range of NOx: 0~2500ppm, 02: -12%~21% set by the vehicle. If it is within the range, no maintenance is required. If it is not within the range, the vehicle ECU reports a fault.

[0046] Further, in step S5, when the test vehicle that needs to be newly measured has been stationary for more than or equal to 30 days after the nitrogen oxide sensor is installed, when it is used again, it needs to be multiplied by the aging correction coefficient within less than 2 hours before output, and the measured NOx and O2 concentration parameters can be directly output within more than or equal to 2 hours. When the vehicle has been stationary for a long time, especially in winter weather, when the temperature drops severely, the ECU fault light is prone to light up incorrectly, so the vehicle needs to be warmed up and used so that the nitrogen oxide sensor can output a more accurate value under normal operating conditions. When the output does not reach normal operating conditions, it is multiplied by the aging correction coefficient before output, which can effectively prevent the ECU fault light from falsely alarming.

[0047] Further, in step S2, different mileages will result in different degrees of aging. The aging coefficient is measured by the control variable method. For vehicles with different mileages, the current NOx and O2 concentration parameters are multiplied by the aging correction coefficient when measured, and then multiplied by the aging coefficient. The deviation requirements are NOx: ≤10%, 02: ≤5% (5-21%) or ≤0.15% (0-5%). If it is within this range, the accuracy of the nitrogen oxide sensor meets the requirements. Aging is an irreversible situation. The greater the mileage, the more serious the wear of the engine, and the greater the impact on the nitrogen oxide sensor. In order to prevent the nitrogen oxide sensor from being unable to operate normally in vehicles with large mileage, it is necessary to measure the aging correction coefficient and the driving aging coefficient at the same time, so as to ensure that the output accuracy of vehicles with large mileage is high and the normal operation of the nitrogen oxide sensor is ensured.

[0048] Furthermore, the daily driving conditions in step S2 include low speed, medium speed, high speed, overspeed and idle speed, low speed is 0-60km / h, medium speed is 60-100km / h, high speed is 100-120km / h, overspeed is above 120km / h, and idle speed is the state where the internal combustion engine is in no-load state and the engine runs at the lowest stable speed. Dividing the daily driving conditions into several modes will facilitate measurement and statistics, and can also more intuitively observe the impact of daily driving conditions on the degree of aging.

[0049] Further, the correction calculation module in step S4 is that after the nitrogen oxide sensor is installed, the parameters of NOx and O2 concentrations are recorded under different mileages, the same driving conditions and the same working time for the same vehicle, and then the parameters actually measured after the nitrogen oxide sensor is disassembled are recorded; the parameters of NOx and O2 concentrations are recorded under different driving conditions, the same mileage and the same working time, and then the parameters actually measured after the nitrogen oxide sensor is disassembled are recorded; the parameters of NOx and O2 concentrations are recorded under different working times, the same driving conditions and the same mileage, and then the parameters actually measured after the nitrogen oxide sensor is disassembled are recorded, and the correction calculation module is a database formed by a large amount of time and a large number of experimental comparisons.

[0050] Furthermore, the actual parameters measured are compared with corresponding parameters measured by the vehicle under the control variables, so as to calculate an aging correction parameter table that meets the requirements of the working time of the test vehicle after the newly measured nitrogen oxide sensor is installed in the corresponding range, the corresponding mileage and the corresponding driving conditions, and the aging correction coefficient is extracted by using the correction calculation module and the aging correction parameter table entered in advance, and the test experimental data is compared with the new nitrogen oxide sensor data to calculate an aging correction coefficient table, and a correction calculation module is installed before the nitrogen oxide sensor outputs the data using the aging correction coefficient table to ensure that the output accuracy is more accurate.

[0051] Furthermore, in step S2, the nitrogen oxide sensor includes a ceramic chip. When the nitrogen oxide sensor is working, the temperature of the ceramic chip is stably controlled at the target temperature (generally at 800 degrees Celsius) to obtain a more stable output value. When the ceramic chip is used for a long time, particles will be enriched on the surface of the platinum electrode, resulting in poor surface activity and affected measurement accuracy. In addition, the daily heating and temperature control of the ceramic chip will also affect the measurement accuracy of the nitrogen oxide sensor after a long period of time. Therefore, the temperature of the ceramic chip needs to be controlled by PID. The PID controller processes the feedback signal of the controlled object and calculates the control signal, thereby achieving control of the controlled object. The more stable the temperature of the ceramic chip, the more accurate the output.

[0052] Furthermore, when the ceramic chip is working, the temperature may fluctuate within the target temperature range, resulting in insufficient output accuracy. Therefore, the variable conditions are controlled to be consistent by using the method of controlling variables, and the output values ​​under different temperature fluctuations are measured. Then, the values ​​measured by the nitrogen oxide sensor under the same conditions at the same post-processing system ambient temperature are used. The ceramic chip aging correction coefficient table is obtained by comparing the two values. When the temperature stability of the ceramic chip deteriorates, the output accuracy will be greatly reduced. Therefore, the same nitrogen oxide sensor needs to be measured at different floating temperatures and compared with the values ​​output at stable temperature to obtain a set of ceramic chip aging correction coefficient tables, so as to use the ceramic chip aging correction coefficient table to ensure that the output values ​​of the nitrogen oxide sensor at different temperatures are more accurate.

[0053] Furthermore, the correction calculation module in step S4 includes an aging correction coefficient table, a driving aging coefficient table and a ceramic chip aging correction coefficient table. The output values ​​of the nitrogen oxide sensor are corrected using the three data tables, which can improve the accuracy of the output values ​​and achieve more accurate output.

[0054] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front and back", "left and right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0055] Of course, in the present technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0056] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art under the technical guidance of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for correcting aging of a nitrogen oxide sensor, characterized in that: include Step S1: prepare six fleets of different brands, each fleet consists of ten vehicles of the same brand, model and specification, and install the nitrogen oxide sensor to be tested. Before installation, the NOx and O2 concentration accuracy data of the nitrogen oxide sensor to be tested need to be measured (compared with the benchmark); Step S2: after every 50,000 kilometers of vehicle travel, record the cumulative working time, cumulative mileage and daily driving conditions of the nitrogen oxide sensor after installation, and measure the NOx and O2 concentration accuracy data of the nitrogen oxide sensor installed thereon (compared to the benchmark); Step S3: After the vehicle has traveled 600,000 kilometers, the data is summarized; Step S4: Calculate the aging correction coefficient through the correction calculation module (combined with the running mileage), and formulate the parameter by comprehensively considering the differences between different samples; Accuracy deviation requirements: NOx: ≤10%, 02: ≤5% (5-21%) or ≤0.15% (0-5%). If it is within this range, the accuracy of the nitrogen oxide sensor meets the requirements. NOx test range: 0~2500ppm, 02 test range: -12%~21%; Step S5: measuring the NOx and O2 concentration parameters of the test vehicle after the nitrogen oxygen sensor that needs to be newly measured is installed; Step S6: The data measured in step S5 is multiplied by the aging correction coefficient in step S4 and outputted; Step S7: The output value is compared with the accuracy requirement range of NOx: 0~2500ppm, 02: -12%~21% set by the vehicle. If it is within the range, no maintenance is required. If it is not within the range, the vehicle ECU reports a fault.

2. The method for correcting aging of a nitrogen oxide sensor according to claim 1, characterized in that: In step S5, when the test vehicle that needs to be newly measured has been stationary for more than or equal to 30 days after the nitrogen oxygen sensor is installed, when it is used again, it needs to be multiplied by the aging correction coefficient within less than 2 hours before output, and the measured NOx and O2 concentration parameters can be directly output within more than or equal to 2 hours.

3. The method for correcting aging of a nitrogen oxide sensor according to claim 1, characterized in that: In step S2, different mileages will result in different degrees of aging. The aging coefficient is measured using the control variable method. For vehicles with different mileages, the current NOx and O2 concentration parameters are multiplied by the aging correction coefficient when measured, and then multiplied by the aging coefficient. The deviation requirements are NOx: ≤10%, 02: ≤5% (5-21%) or ≤0.15% (0-5%). If it is within this range, the accuracy of the nitrogen oxide sensor meets the requirements.

4. The method for correcting aging of a nitrogen oxide sensor according to claim 1, characterized in that: The daily driving conditions in step S2 include low speed, medium speed, high speed, overspeed and idle speed, low speed is 0-60km / h, medium speed is 60-100km / h, high speed is 100-120km / h, overspeed is above 120km / h, and idle speed is the state where the internal combustion engine is in no-load state and the engine runs at the lowest stable speed.

5. The method for correcting aging of a nitrogen oxide sensor according to claim 1, characterized in that: The correction calculation module in step S4 is that after the nitrogen oxide sensor is installed, the parameters of NOx and O2 concentrations are recorded under different mileages, the same driving conditions and the same working time for the same vehicle, and then the parameters actually measured after the nitrogen oxide sensor is disassembled are recorded; the parameters of NOx and O2 concentrations are recorded under different driving conditions, the same mileage and the same working time, and then the parameters actually measured after the nitrogen oxide sensor is disassembled are recorded; the parameters of NOx and O2 concentrations are recorded under different working times, the same driving conditions and the same mileage, and then the parameters actually measured after the nitrogen oxide sensor is disassembled are recorded.

6. The method for correcting aging of a nitrogen oxide sensor according to claim 5, characterized in that: The actual parameters measured are compared with the corresponding parameters measured by the vehicle under the control variables, so as to calculate an aging correction parameter table that meets the requirements of the working time of the test vehicle after the newly measured nitrogen oxide sensor is installed in the corresponding range, the corresponding mileage and the corresponding driving conditions, and the aging correction coefficient is extracted using the correction calculation module and the aging correction parameter table entered in advance.

7. The method for correcting aging of a nitrogen oxide sensor according to claim 1, characterized in that: In step S2, the nitrogen oxide sensor includes a ceramic chip. When the nitrogen oxide sensor is working, the temperature of the ceramic chip is stably controlled at a target temperature (generally at 800 degrees Celsius).

8. The method for correcting aging of a nitrogen oxide sensor according to claim 7, characterized in that: When the ceramic chip is working, the temperature will fluctuate within the target temperature range, resulting in insufficient output accuracy. Therefore, the variable conditions are controlled to be consistent by using the method of controlling variables, and the output values ​​under different temperature fluctuations are measured. Then, the values ​​measured by the nitrogen oxide sensor under the same conditions at the same post-processing system ambient temperature are used. The ceramic chip aging correction coefficient table is obtained by comparing the two values.

9. The method for correcting aging of a nitrogen oxide sensor according to claim 1, characterized in that: The correction calculation module in step S4 includes an aging correction coefficient table, a driving aging coefficient table and a ceramic chip aging correction coefficient table.

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