CN113671129A - Method, device and system for simultaneously operating two nitrogen oxide sensors - Google Patents
Method, device and system for simultaneously operating two nitrogen oxide sensors Download PDFInfo
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 449
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000004044 response Effects 0.000 claims abstract description 113
- 239000007789 gas Substances 0.000 claims abstract description 44
- 230000003197 catalytic effect Effects 0.000 claims abstract description 38
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 239000000523 sample Substances 0.000 abstract 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- -1 oxygen ions Chemical class 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004092 self-diagnosis Methods 0.000 description 2
- RZCJYMOBWVJQGV-UHFFFAOYSA-N 2-naphthyloxyacetic acid Chemical compound C1=CC=CC2=CC(OCC(=O)O)=CC=C21 RZCJYMOBWVJQGV-UHFFFAOYSA-N 0.000 description 1
- 101000668165 Homo sapiens RNA-binding motif, single-stranded-interacting protein 1 Proteins 0.000 description 1
- 102100039692 RNA-binding motif, single-stranded-interacting protein 1 Human genes 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100001143 noxa Toxicity 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
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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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0037—NOx
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention relates to a method, a device and a system for operating two nitrogen oxide sensors simultaneously, wherein the flow direction of vehicle exhaust gas is provided with a front nitrogen oxide sensor (probe) and a rear nitrogen oxide sensor (probe) at least at a catalytic converter, and the response current values of the front nitrogen oxide sensor (10) and the rear nitrogen oxide sensor (11) which operate simultaneously are controlled by a nitrogen oxide controller simultaneously, so that the ratio D1/D2 of the response current value D1 of the front nitrogen oxide sensor (10) and the response current value D2 of the rear nitrogen oxide sensor (11) is approximately equal to 1, and the front nitrogen oxide sensor (10) and the rear nitrogen oxide sensor (11) have the same response electric signal to oxygen when detecting the same gas. According to the ratio of the response current values of the two sensors, the catalytic capability of the catalytic converter is adjusted, so that the purposes of effectively improving the dynamic property and the economical efficiency of the automobile and reducing the NOx emission in the tail gas can be achieved.
Description
Technical Field
The present invention relates to a method for operating a nitrogen oxide gas sensor of a vehicle, and more particularly to a method, apparatus and system for simultaneously operating two nitrogen oxide gas sensors.
Background
In recent years, the automobile holding amount has a rapidly increasing trend, causing various problems such as an increase in traffic pressure and environmental pollution. Nowadays, automobile exhaust is the most main pollution source of global air pollution, which is especially prominent in urban environmental pollution because the emission of automobile exhaust accounts for 70% -90% of the emission of urban atmospheric pollutants. The nation also pays more and more attention to the emission detection of toxic and harmful gases of automobiles, such as the implementation of the national six standards and the like. Therefore, the use of a device for detecting components of automobile exhaust is highly urgent.
The gas catalytic converter (SCR) is a treatment process for NOx in vehicle exhaust emission, which relates to a selective catalytic reduction technology, i.e. NOx in the exhaust is reduced into N2 and H2O by injecting a reducing agent ammonia or urea under the action of a catalyst.
In multi-chamber nitrogen oxide sensors based on YSZ ceramics widely used in the market, the principle is that when oxygen ions are decomposed in a chamber through nitrogen oxides, electric signals generated by the movement of the oxygen ions in the ceramics are detected, and then the content of the nitrogen oxides is calculated according to a corresponding proportion. Since oxygen has a great influence on the detection of the target gas, it is very necessary to ensure the detection reliability of the nitrogen oxide sensor.
Disclosure of Invention
It is an object of the present invention to provide a method for operating two nox sensors simultaneously.
It is a further object of the present invention to provide an apparatus for the above method for operating two nox sensors simultaneously.
It is a further object of the present invention to provide a system for the above method for operating two nox sensors simultaneously.
The purpose of the invention is realized by the following scheme: a method for operating two nitrogen oxide sensors simultaneously is provided, wherein a nitrogen oxide sensor is arranged at a gas catalytic converter (SCR), a front nitrogen oxide sensor and a rear nitrogen oxide sensor are arranged at least at the gas catalytic converter in the flowing direction of vehicle tail gas, the response current values of the front nitrogen oxide sensor and the rear nitrogen oxide sensor which operate simultaneously are controlled by a controller, the ratio D1/D2 of the response current value D1 of the front nitrogen oxide sensor and the response current value D2 of the rear nitrogen oxide sensor is approximately equal to 1, so that the front nitrogen oxide sensor and the rear nitrogen oxide sensor have the same response electric signal to oxygen when detecting the same gas, and the reliability of data when the rear nitrogen oxide sensor detects the rear nitrogen oxide when the front nitrogen oxide sensor detects the front nitrogen oxide is further ensured.
The invention provides a method for simultaneously operating a plurality of nitrogen oxide gas sensors of a vehicle having a front nitrogen oxide sensor, a rear nitrogen oxide sensor and a catalytic converter. The method simultaneously detects the proportion of front nitrogen oxide and rear nitrogen oxide in the automobile exhaust, and works together with the gas catalytic converter.
Preferably, determining a response current value D1 of the front NOx sensor;
preferably, determining a response current value D2 of the rear nitrogen oxide sensor;
preferably, a ratio of the pre-NOx sensor response current value D1 to the NOx sensor response current value D2 is determined.
On the basis of the scheme, the response current value D1 of the front NOx sensor and the minimum value L of the ratio of the rear NOx sensor are set and compared:
when the ratio is smaller than a preset minimum value, adjusting the response current value D2 of the nitrogen oxide sensor (11), and finally enabling the ratio to be larger than a preset minimum value L;
and when the ratio is larger than the preset minimum value L, carrying out the next work.
On the basis of the scheme, the response current value D1 of the front nitrogen oxide sensor and the response current value D2 of the rear nitrogen oxide sensor are response electric signals of the corresponding sensors to oxygen components in the exhaust gas, and are used as self-diagnosis values to represent the ratio of the measured oxygen concentration to the preset reference oxygen concentration.
Preferably, the catalytic ability of the catalytic converter is further adjusted based on the ratio of the response current values of the two sensors, so that the response current value D1 of the front nox sensor or the response current value D2 of the rear nox sensor is adjusted to make the ratio of the response current values of the two sensors close to 1.
Further, the controller controls the response current values of the front nox sensor and the rear nox sensor according to the following steps:
s1 determining the response current value D1 of the front NOx sensor, the response current value D1 of the front NOx sensor and the set D1minAnd D1maxComparing, when the response current value D1 is in the set range, namely D1min <Response current value D1< D1maxIf so, the front nitrogen oxide sensor continues to work next step, otherwise, the front nitrogen oxide sensor is judged to be in fault;
s2 determining the response current value D2 of the rear NOx sensor, the response current value D2 of the rear NOx sensor and the set D2minAnd D2maxComparing, when the response current value D2 is in the set range, namely D2min <Response current value D2< D2maxIf so, the rear nitrogen oxide sensor continues to work next step, otherwise, the rear nitrogen oxide sensor is judged to be in fault;
s3, according to the ratio of the response current values of the two sensors, the catalytic capability of the SCR is adjusted, so that the ratio D1/D2 of the response current value D1 of the front nitrogen oxide sensor and the response current value D2 of the rear nitrogen oxide sensor is approximately equal to 1;
s4 determining the NOx measured by the front NOx sensor under the preset operation state of the vehicleSubstance NOXA value;
s5 determines a nox value measured by the post nox sensor after passing through the catalytic converter under predetermined operating conditions of the vehicle.
S6 calculates the NOx NO corresponding to the set position of the NOx sensorXConcentration, and communication and storage in the controller.
In S3, the catalytic ability of the catalytic converter is adjusted by correcting the response current curves and the slopes thereof for the respective detection targets preset by the front nox sensor and the rear nox sensor, so that the response current value D1 of the front nox sensor and the response current value D2 of the rear nox sensor are adjusted.
Preferably, when any one of the front nox sensor and the rear nox sensor is determined to be faulty, only the response current value thereof should be corrected; when both the front nox sensor and the rear nox sensor determine that there is a malfunction, the sensor disposed at the forefront in the exhaust gas flow direction should be corrected first.
Preferably, a nox value measured by the front nox sensor in a predetermined operating state of the vehicle is determined.
Preferably, a nitrogen oxide value measured by the nitrogen oxide sensor after passing a catalytic converter in a predetermined operating state of the vehicle is determined.
The invention also provides a device for operating two nitrogen oxide sensors simultaneously according to the above, a front nitrogen oxide sensor and a rear nitrogen oxide sensor are arranged at least at the gas catalytic converter in the flow direction of the vehicle exhaust gas, and each sensor is connected with the controller.
Further, the front and rear nitrogen oxide sensors are both disposed upstream of the gas catalytic converter, or both disposed downstream, or the front nitrogen oxide sensor is disposed upstream of the gas catalytic converter and the rear nitrogen oxide sensor is disposed downstream of the gas catalytic converter.
The present invention also provides a control system for simultaneously operating two nox sensors according to the above, which detects oxygen components in exhaust gas by simultaneously controlling front and rear nox sensors disposed at different positions along an SCR by a controller, comprising the steps of:
1) the front and rear NOx sensors respectively obtain response current values D1 and D2;
2) comparing the response current values with the set ranges of the front and rear nitrogen oxide sensors, and entering the next step if the response current values are within the set ranges; if not, the response current value is measured again;
3) judging that D1/D2 is approximately equal to 1, if not, adjusting the catalytic capability of the SCR; if yes, entering the next step;
4) comparing D1/D2 > the minimum value L, and entering the next step; if not, returning to the step 3) and adjusting the D1/D2 value;
5) calculation of Nitrogen oxides NO before and after by D1, D2XConcentration;
6) and the calculation result is communicated and stored in the control system.
According to the set response current value range of each nitrogen oxide sensor, the method is used for judging whether the working state of the nitrogen oxide sensor is normal or not, and when the working state is normal, the method calculates the nitrogen oxide NO corresponding to the position where the nitrogen oxide sensor is arrangedXConcentration, and communication and storage in the control system.
The invention provides a strategy for correcting the response current value of a nitrogen oxide sensor, the adjustment being carried out in the following manner:
preferably, the response current value D1 of the front NOx sensor is equal to the set value D1minAnd D1maxThe comparison is made only when the response current value is in the range (D1)min <Response current value D1< D1max) If the previous nitrogen oxide sensor continues to work in the next step, otherwise, the previous nitrogen oxide sensor is judged to be in fault;
preferably, the response current value D2 of the rear nitrogen oxide sensor is equal to the set value D2minAnd D2maxThe comparison is made only when the response current value is in the range (D2)min <Response current value D2< D2max) The rear nitrogen oxide sensor continues to work in the next step, otherwise, the rear nitrogen oxide sensor is judged to be in fault;
preferably, the ratio of the response current value D1 of the front NOx sensor to the response current value D2 of the rear NOx sensor should be approximately equal to 1 within an error tolerance range.
Preferably, the ratio of the response current value D1 of the front nox sensor (10) to the response current value of the rear nox sensor should be compared to a preset minimum value. When the ratio is smaller than the preset minimum value, adjusting the response current value D2 of the nitrogen oxide sensor, and finally enabling the ratio to be larger than the preset minimum value; and when the ratio is larger than the preset minimum value, the equipment performs the next operation.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method, a device and a system capable of simultaneously operating a front nitrogen oxide sensor and a rear nitrogen oxide sensor, which have higher detection efficiency and simultaneously enable a tail gas detection system of a vehicle to occupy less space; the existence of oxygen has a high inhibiting effect on the decomposition of nitrogen oxides, and the interference of the oxygen on the detection target gas signal of the sensor is reduced to a great extent by the detection of the response current value of the nitrogen oxide sensor; the detection of the ratio of the response current value D1 of the front nitrogen oxide sensor to the response current value D2 of the rear nitrogen oxide sensor improves the reliability of the detection data of the two sensors.
According to the ratio of the response current values of the two sensors, the catalytic capability of the catalytic converter is adjusted, so that the purposes of effectively improving the dynamic property and the economical efficiency of the automobile and reducing the NOx emission in the tail gas can be achieved.
Drawings
FIG. 1 is a schematic view of a sensor arrangement according to example 1 of the present invention;
FIG. 2 is a schematic diagram of the system operation flow of embodiment 1 of the present invention;
the reference numbers in the figures illustrate:
1-nitrogen oxide controller; 2-SCR;
10-front NOx sensor; 11-post NOx sensor.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
An apparatus for simultaneously operating two NOx sensor devices of the present invention, as shown in FIG. 1, includes
In the flowing direction of the vehicle exhaust gas, a front nitrogen oxide sensor 10 is arranged at the upstream of a gas catalytic converter (SCR) 2, a rear nitrogen oxide sensor 11 is arranged at the downstream of the SCR2, the sensors are respectively connected with a nitrogen oxide controller 1, and the controller 1 controls the response current values of the front nitrogen oxide sensor 10 and the rear nitrogen oxide sensor 11 which operate simultaneously, so that the ratio D1/D2 of the response current value D1 of the front nitrogen oxide sensor 10 and the response current value D2 of the rear nitrogen oxide sensor 11 is approximately equal to 1.
When the vehicle is in a predetermined state, the front nox sensor 10 and the rear nox sensor 11 perform self-diagnosis, respectively. As shown in fig. 2, in particular, in the YSZ ceramic-based multi-chamber oxide sensor, the response current value is the response electrical signal to the oxygen component in the exhaust gas, namely:
the front nitrogen oxide sensor 10 firstly pumps oxygen in the tail gas out of the cavity in the front cavity in a voltage-applied mode, at the moment, an electric signal-response current value D1 is generated in the oxygen pumping process, when the response current value D1 is in a preset range, the controller 1 can control the front nitrogen oxide sensor 10 to work next step, otherwise, the front nitrogen oxide sensor 10 is judged to be in fault; when the controller receives the fault signal of the front nitrogen oxide sensor 10, the response current value D1 of the front nitrogen oxide sensor 10 is adjusted by correcting the response current curve and the slope thereof of the pump oxygen preset by the front nitrogen oxide sensor 10 under certain applied voltage;
the rear nox sensor 11 is the same.
It is determined that the ratio of the response current value D1 of front nox sensor 10 to the response current value D2 of rear nox sensor 11 should be approximately equal to 1 within the error tolerance. The purpose of this is to ensure that the front nox sensor 10 and the rear nox sensor 11 have the same response electrical signal to oxygen when they detect the same gas. The reliability of data is further ensured when the front nitrogen oxide sensor (10) detects the front nitrogen oxide and the rear nitrogen oxide sensor (11) detects the rear nitrogen oxide.
On the premise that the ratio of the two response current values is equal to 1, judging whether the ratio is greater than a preset minimum value L, and when the ratio is less than L, correcting the response current value D2 of the rear nitrogen oxide sensor 11 by a program; when the detected value is larger than L, the controller simultaneously controls the catalytic converter, the front nitrogen oxide sensor 10 and the rear nitrogen oxide sensor 11 to respectively detect the content of the front nitrogen oxide and the content of the rear nitrogen oxide of the catalytic converter SCR 2.
The final test data is communicated to the controller 1 and stored.
According to the invention, the response current values of the front and rear nitrogen oxide sensors are determined through a nitrogen oxide control system; and determining the ratio of the response current value of the front nitrogen oxide sensor to the response current value of the rear nitrogen oxide sensor according to the response current values of the two sensors, and processing data of a controller to obtain NOx measured values of the front nitrogen oxide sensor and the rear nitrogen oxide sensor for reference of other nodes of a vehicle system.
Claims (12)
1. A method for operating two nitrogen oxide sensors simultaneously, a nitrogen oxide sensor is arranged at a gas catalytic converter (SCR) (2), characterized in that, in the flow direction of the vehicle exhaust gas, at least a front nitrogen oxide sensor (10) and a rear nitrogen oxide sensor (11) are arranged at the gas catalytic converter, the response current values of the front nitrogen oxide sensor (10) and the rear nitrogen oxide sensor (11) which operate simultaneously are controlled by a nitrogen oxide controller (1), the ratio D1/D2 of the response current value D1 of the front nitrogen oxide sensor (10) and the response current value D2 of the rear nitrogen oxide sensor (11) is approximately equal to 1, and the front nitrogen oxide sensor (10) and the rear nitrogen oxide sensor (11) are ensured to have the same response electric signal to oxygen when detecting the same gas.
2. The method for simultaneously operating two NOx sensors of claim 1, wherein: setting and comparing the minimum value L of the ratio of the response current value D1 of the front nitrogen oxide sensor (10) to the rear nitrogen oxide sensor (11):
when the ratio is smaller than a preset minimum value, adjusting the response current value D2 of the nitrogen oxide sensor (11), and finally enabling the ratio to be larger than a preset minimum value L;
and when the ratio is larger than the preset minimum value L, carrying out the next work.
3. Method for operating two nox sensors simultaneously according to claim 1, characterized in that the response current value D1 of the front nox sensor (10) and the response current value D2 of the rear nox sensor (11) are the response electrical signals of the respective sensors to the oxygen content of the exhaust gas, as self-diagnostic values, representing the ratio of the measured oxygen concentration to a predetermined reference oxygen concentration.
4. Method for operating two nox sensors simultaneously according to one of claims 1 to 3, characterized in that: the controller (1) controls the response current values of the front nitrogen oxide sensor (10) and the rear nitrogen oxide sensor (11) according to the following steps:
s1 determining the response current value D1 of the front NOx sensor (10), the response current value D1 of the front NOx sensor (10) and the set D1minAnd D1maxComparing, when the response current value D1 is in the set range, namely D1min <Response current value D1< D1maxIf so, the front nitrogen oxide sensor (10) continues to work next step, otherwise, the front nitrogen oxide sensor (10) is judged to be in fault;
s2 determining the response current value D2 of the rear NOx sensor (11), the response current value D2 of the rear NOx sensor (11) and the set D2minAnd D2maxThe comparison is carried out when the response current value D2 is within a set range, i.e. the response current value D2 is within a set rangeD2min <Response current value D2< D2maxIf so, the rear nitrogen oxide sensor (11) continues to work next step, otherwise, the rear nitrogen oxide sensor (11) is judged to be in fault;
s3, adjusting the catalytic capability of a gas catalytic converter (SCR) (2) according to the ratio of the response current values of the two sensors, so as to adjust the ratio D1/D2 of the response current value D1 of the front nitrogen oxide sensor (10) and the response current value D1/D2 of the rear nitrogen oxide sensor (11) to be approximately equal to 1;
s4 determining the NOx NO measured by the front NOx sensor (10) under the preset operation state of the vehicleXA value;
s5 determines a nox value measured by the post nox sensor (11) after passing a catalytic converter under predetermined operating conditions of the vehicle.
S6 calculates the NOx NO corresponding to the set position of the NOx sensorXConcentration, and communication and storage in the controller (1).
5. The method for simultaneously operating two NOx sensors of claim 4, wherein: in S3, the response current value D1 of the front nitrogen oxide sensor (10) and the response current value D2 of the rear nitrogen oxide sensor (11) are adjusted by correcting the response current curves and slopes thereof preset by the front nitrogen oxide sensor (10) and the rear nitrogen oxide sensor (11) for the respective detection targets to adjust the catalytic ability of the catalytic converter.
6. The method for simultaneously operating two NOx sensors of claim 4, wherein: when any one of the front nitrogen oxide sensor (10) and the rear nitrogen oxide sensor (11) is judged to be faulty, only the response current value thereof should be corrected; when both the front nox sensor (10) and the rear nox sensor (11) are determined to be malfunctioning, the sensor disposed at the forefront in the exhaust gas flow direction should be corrected first.
7. An apparatus for simultaneously operating two nox sensors according to any one of claims 1 to 6, characterized in that: a front nitrogen oxide sensor (10) and a rear nitrogen oxide sensor (11) are arranged at least at the position of the gas catalytic converter (2) along the flowing direction of the tail gas of the vehicle, and the sensors are respectively connected with the controller (1).
8. An apparatus for simultaneously operating two NOx sensors according to claim 7, wherein: the front nitrogen oxide sensor (10) and the rear nitrogen oxide sensor (11) are both arranged at the upstream of the gas catalytic converter (2) or both arranged at the downstream, or the front nitrogen oxide sensor (10) is arranged at the upstream of the gas catalytic converter (2) and the rear nitrogen oxide sensor (11) is arranged at the downstream of the gas catalytic converter (2).
9. An apparatus for simultaneously operating two nox sensors according to claim 7 or 8, characterized in that: the front and rear nitrogen oxide sensors (10) and (11) adopt YSZ ceramic-based multi-cavity oxide sensors.
10. A control system for simultaneously operating two nox sensors according to any one of claims 7 to 9, characterized in that: the method comprises the following steps of simultaneously controlling front and rear nitrogen oxide sensors (10) and (11) arranged at different positions of a gas catalytic converter (SCR) (2) by a controller (1) to detect oxygen components in the tail gas:
1) front and rear NOx sensors (10, 11) respectively obtain response current values D1, D2;
2) comparing the response current value with the set range of the front and back nitrogen oxide sensors (10) and (11), and entering the next step; if not, the response current value is measured again;
3) judging that D1/D2 is approximately equal to 1, if not, adjusting the catalytic capability of the SCR; if yes, entering the next step;
4) comparing D1/D2 > the minimum value L, and entering the next step; if not, returning to the step 3) and adjusting the D1/D2 value;
5) calculation of Nitrogen oxides NO before and after by D1, D2XConcentration;
6) and the calculation result is communicated and stored in the control system.
11. The control system for simultaneously operating two nox sensors according to claim 10, wherein: according to the set response current value range of each nitrogen oxide sensor, the method is used for judging whether the working state of the nitrogen oxide sensor is normal or not, and when the working state is normal, the method calculates the nitrogen oxide NO corresponding to the position where the nitrogen oxide sensor is arrangedXConcentration, and communication and storage in the control system.
12. The control system for simultaneously operating two nox sensors according to claim 10, wherein: the adjustment is performed in the following manner:
the response current value D1 of the front NOx sensor (10) and the set D1minAnd D1maxBy comparison, only when the response current value D1 satisfies D1min <Response current value D1< D1maxThe front nitrogen oxide sensor (10) continues to work in the next step, otherwise, the front nitrogen oxide sensor (10) is judged to be in fault;
the response current value D2 of the rear nitrogen oxide sensor (11) and the set D2minAnd D2maxBy comparison, only when the response current value D2 satisfies D2min <Response current value D2< D2maxAnd the rear nitrogen oxide sensor (11) continues to work next, otherwise, the rear nitrogen oxide sensor (11) is judged to be in fault.
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| CN115095416B (en) * | 2021-12-21 | 2024-05-28 | 长城汽车股份有限公司 | Signal detection method, device and system for vehicle tail gas |
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