CN114961956B - Selective catalytic reduction conversion efficiency diagnosis method and device - Google Patents
Selective catalytic reduction conversion efficiency diagnosis method and device Download PDFInfo
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- CN114961956B CN114961956B CN202210789206.1A CN202210789206A CN114961956B CN 114961956 B CN114961956 B CN 114961956B CN 202210789206 A CN202210789206 A CN 202210789206A CN 114961956 B CN114961956 B CN 114961956B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 88
- 238000010531 catalytic reduction reaction Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000003745 diagnosis Methods 0.000 title abstract description 28
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 136
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 55
- 238000003860 storage Methods 0.000 claims abstract description 31
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 24
- 231100000572 poisoning Toxicity 0.000 claims abstract description 24
- 230000000607 poisoning effect Effects 0.000 claims abstract description 24
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 24
- 239000011593 sulfur Substances 0.000 claims abstract description 24
- 238000011144 upstream manufacturing Methods 0.000 claims description 27
- 230000010354 integration Effects 0.000 claims description 13
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims description 13
- 238000005336 cracking Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 238000004364 calculation method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 3
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 101150105073 SCR1 gene Proteins 0.000 description 2
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 description 2
- GDXWHFPKFUYWBE-UHFFFAOYSA-N [F].Cl Chemical compound [F].Cl GDXWHFPKFUYWBE-UHFFFAOYSA-N 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- -1 oxynitride Chemical compound 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
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Classifications
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1616—NH3-slip from catalyst
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1621—Catalyst conversion efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application provides a selective catalytic reduction conversion efficiency diagnosis method and a device. In performing the method, NO is first performed x Efficiency failure and NH 3 Judging leakage faults; when NO x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 After the sensor signal is less than the first limit, ammonia storage and NO are performed x Judging conversion efficiency; if the ammonia reserve is greater than the second limit, determining sulfur poisoning; if the ammonia reserve is less than or equal to the second limit and the filtered NO x And if the conversion efficiency is smaller than the third limit value, judging that the conversion efficiency of the selective catalytic reduction is faulty. Thus through NO x Efficiency failure and NH 3 Leakage fault judgment can accurately identify the characteristics of cracking parts of the selective catalytic reduction device, and interference caused by sulfur poisoning is avoided, so that the selective catalytic reduction conversion efficiency diagnosis is more accurate. Thus, the problem of low accuracy of the selective catalytic reduction conversion efficiency diagnosis in the prior art is solved.
Description
Technical Field
The application relates to the technical field of waste gas treatment, in particular to a selective catalytic reduction conversion efficiency diagnosis method and device.
Background
The exhaust pollution of a motor vehicle is an environmental pollution caused by exhaust gas emitted from the motor vehicle. The main pollutants are carbon monoxide, hydrocarbon, oxynitride, sulfur dioxide, lead-containing compounds, particulate matters and the like. In addition, carbon dioxide, sulfides, nitrogen oxides, fluorine chlorine hydride and the like emitted from automobiles make the greenhouse effect, ozone layer destruction, acid rain and other atmospheric problems more serious, so that the main aim of reducing the emission of exhaust gas of automobiles is to reduce the emission of nitrogen oxides and soot particles.
The selective catalytic reduction conversion device in the diesel engine aftertreatment is responsible for converting NO harmful to the environment in the tail gas x Reduction to N 2 To meet ultra-low NO x National seven emission standard, NH, for emission and future execution 3 The sensor is the preferred solution in meeting emissions compliance. In detecting the conversion efficiency of a selective catalytic reduction conversion device, the prior art cannot exclude NH 3 Resulting in less accurate diagnosis of the selective catalytic reduction conversion efficiency.
Thus, how to improve the accuracy of the selective catalytic reduction conversion efficiency diagnosis is a technical problem that needs to be solved in the art.
Disclosure of Invention
In view of the above, the embodiment of the application provides a method and a device for diagnosing selective catalytic reduction conversion efficiency, which aim to solve the problem of lower accuracy of diagnosing the selective catalytic reduction conversion efficiency in the prior art.
In a first aspect, embodiments of the present application provide a method for diagnosing selective catalytic reduction conversion efficiency, the method comprising:
NO is performed x Efficiency failure and NH 3 Judging leakage faults;
when NO x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 After the sensor signal is less than the first limit value,ammonia storage and NO x Judging conversion efficiency;
if the ammonia reserve is greater than the second limit, determining sulfur poisoning;
if the ammonia reserve is less than or equal to the second limit and the filtered NO x And if the conversion efficiency is smaller than the third limit value, judging that the conversion efficiency of the selective catalytic reduction is faulty.
Alternatively, NO is performed x The method for judging the efficiency faults specifically comprises the following steps:
for calculated NO x Efficiency and measured NO x The efficiency is poor to obtain a first difference value; if the first difference is greater than the fourth limit and the accumulated engine power is greater than the fifth limit, determining NO x Efficiency fails.
Alternatively, NH is performed 3 The leakage fault judging method specifically comprises the following steps:
judging measured NH 3 Whether the concentration ratio emission is greater than the calculated NH 3 Concentration ratio of discharge, if measured NH 3 Concentration ratio emission greater than calculated NH 3 Concentration ratio is discharged and accumulated engine power exceeds a fifth limit, NH is determined 3 Leakage failure.
Alternatively, the calculated NO is obtained x Efficiency and measured NO x The method for efficiency specifically comprises the following steps:
based on accumulated downstream NO x Sensor value and accumulated upstream NO x Value acquisition of measured NO x The efficiency is expressed as:∑NOx ture for accumulated downstream NO x Sensor value, Σnox us For accumulated upstream NO x A value;
based on accumulated downstream NO x Model value and accumulated upstream NO x Value obtaining calculated NO x The efficiency is expressed as:∑NOx mdl for accumulated downstream NO x Model value, Σnox us For accumulated upstream NO x Values.
Alternatively, obtain measured NH 3 Concentration ratio emission and calculated NH 3 The concentration ratio emission method specifically comprises the following steps:
using measured NH 3 The formula of concentration ratio emission obtains measured NH 3 Concentration ratio of discharged, measured NH 3 The formula of the concentration ratio emission is:∑NH3 act for NH pair 3 Integration of the signal, Σpwr is the integration of the power;
using calculated NH 3 The concentration ratio emission formula obtains the calculated NH 3 Concentration ratio of emissions, calculated NH 3 The formula of the concentration ratio emission is:∑NH3 MAP for NH obtained from a two-dimensional linear interpolation table of preset airspeed and temperature 3 The integral of the concentration ratio emission limit, Σt, is the integral over time.
In a second aspect, embodiments of the present application provide a selective catalytic reduction conversion efficiency diagnostic device, the device comprising: a fault judging module and an efficiency judging module;
the fault judging module is used for carrying out NO x Efficiency failure and NH 3 Judging leakage faults;
the efficiency judging module is used for judging the efficiency of the engine when NO x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 After the sensor signal is less than the first limit, ammonia storage and NO are performed x Judging conversion efficiency; if the ammonia reserve is greater than the second limit, determining sulfur poisoning; if the ammonia reserve is less than or equal to the second limit and the filtered NO x And if the conversion efficiency is smaller than the third limit value, judging that the conversion efficiency of the selective catalytic reduction is faulty.
Optionally, the fault judging module is specifically configured to:
counter meterCalculated NO x Efficiency and measured NO x The efficiency is poor to obtain a first difference value; if the first difference is greater than the fourth limit and the accumulated engine power is greater than the fifth limit, determining NO x Efficiency fails.
Optionally, the fault judging module is specifically configured to:
judging measured NH 3 Whether the concentration ratio emission is greater than the calculated NH 3 Concentration ratio of discharge, if measured NH 3 Concentration ratio emission greater than calculated NH 3 Concentration ratio is discharged and accumulated engine power exceeds a fifth limit, NH is determined 3 Leakage failure.
Optionally, the device further includes a calculation module, where the calculation module is specifically configured to:
based on accumulated downstream NO x Sensor value and accumulated upstream NO x Value acquisition of measured NO x The efficiency is expressed as:∑NOx ture for accumulated downstream NO x Sensor value, Σnox us For accumulated upstream NO x A value;
based on accumulated downstream NO x Model value and accumulated upstream NO x Value obtaining calculated NO x The efficiency is expressed as:∑NOx mdl for accumulated downstream NO x Model value, Σnox us For accumulated upstream NO x Values.
Optionally, the computing module is specifically configured to:
using measured NH 3 The formula of concentration ratio emission obtains measured NH 3 Concentration ratio of discharged, measured NH 3 The formula of the concentration ratio emission is:∑NH3 act for NH pair 3 Integration of the signal, Σpwr is the power of the pairIs a combination of the integration of (2);
using calculated NH 3 The concentration ratio emission formula obtains the calculated NH 3 Concentration ratio of emissions, calculated NH 3 The formula of the concentration ratio emission is:∑NH3 MAP for NH obtained from a two-dimensional linear interpolation table of preset airspeed and temperature 3 The concentration ratio is integrated with the emission limit, Σt is integrated over time.
The embodiment of the application provides a selective catalytic reduction conversion efficiency diagnosis method and device. In performing the method, NO is first performed x Efficiency failure and NH 3 Judging leakage faults; when NO x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 After the sensor signal is less than the first limit, ammonia storage and NO are performed x Judging conversion efficiency; if the ammonia reserve is greater than the second limit, determining sulfur poisoning; if the ammonia reserve is less than or equal to the second limit and the filtered NO x And if the conversion efficiency is smaller than the third limit value, judging that the conversion efficiency of the selective catalytic reduction is faulty. Thus, through NO x Efficiency failure and NH 3 Leakage fault judgment can accurately identify the characteristics of cracked parts of the selective catalytic reduction device, and interference caused by sulfur poisoning is considered, and through judgment of ammonia reserves, interference caused by sulfur poisoning is avoided, so that the selective catalytic reduction conversion efficiency diagnosis is more accurate. Therefore, the problem of low accuracy of the selective catalytic reduction conversion efficiency diagnosis in the prior art can be solved.
Drawings
In order to more clearly illustrate this embodiment or the technical solutions of the prior art, the drawings that are required for the description of the embodiment or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of spatial position and signal relationship of each sensor according to the scheme provided by the application;
FIG. 2 is a flow chart illustrating a method for diagnosing a selective catalytic reduction conversion efficiency according to an embodiment of the present application;
FIG. 3 is a flow chart of ammonia storage determination provided in an embodiment of the present application;
FIG. 4 is a schematic diagram of an SCR conversion efficiency diagnostic process according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a selective catalytic reduction conversion efficiency diagnostic device according to an embodiment of the present application.
Detailed Description
The exhaust pollution of a motor vehicle is an environmental pollution caused by exhaust gas emitted from the motor vehicle. The main pollutants are carbon monoxide, hydrocarbon, oxynitride, sulfur dioxide, lead-containing compounds, particulate matters and the like. In addition, carbon dioxide, sulfides, nitrogen oxides, fluorine chlorine hydride and the like emitted from automobiles make the greenhouse effect, ozone layer destruction, acid rain and other atmospheric problems more serious, so that the main aim of reducing the emission of exhaust gas of automobiles is to reduce the emission of nitrogen oxides and soot particles.
The selective catalytic reduction conversion (Selective Catalyst Reduction, SCR) device in the diesel aftertreatment is responsible for environmentally harmful NO in the exhaust gas x Reduction to N 2 ，NO x Is NO and NO in automobile exhaust 2 To meet ultra-low NO x National seven emission standard, NH, for emission and future execution 3 The sensor is the preferred solution in meeting emissions compliance. The prior art does not exclude NH when detecting SCR conversion efficiency 3 Resulting in less accurate diagnosis of SCR conversion efficiency.
In view of this, the inventors have considered that if NH can be introduced 3 Sensor signal for distinguishing NO x Cross-sensitivity of sensor, binding NO x Efficiency determination and NH 3 The leakage judgment can accurately identify the characteristics of the SCR cracking piece; and considering that sulfur poisoning may affect the judgment accuracy when the judgment of SCR conversion efficiency is made, if ammonia storage judgment can be introducedThe interruption can avoid the interference of sulfur poisoning to the detection result, so that the accuracy of SCR conversion efficiency diagnosis can be improved.
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Before describing the scheme of the application, the technology in the field related to the application is described so as to facilitate understanding of the scheme of the application.
Referring to fig. 1, fig. 1 is a schematic diagram showing the spatial position and signal relationship of each sensor according to the scheme provided by the application, wherein a temperature sensor and NO are installed in front of SCR1 x 1 sensor and spray nozzle DM1, NH is installed behind tail pipe ASC 3 Sensor, NO x 2 sensor and temperature sensor.
SCR conversion efficiency diagnostic includes NH 3 Sensor signal diagnostics, NO x Efficiency diagnostics and ammonia storage diagnostics.
Before SCR conversion efficiency diagnosis, it is necessary to determine whether the conditions for efficiency diagnosis are satisfied, and the conditions for determination mainly include: SCR temperature, exhaust gas quantity, engine speed, torque and NO x Signals, etc.
Condition 1: calculating an average temperature of the SCR according to the temperatures upstream and downstream of the SCR1, wherein the average temperature is in an upper limit and a lower limit, for example, the average temperature is 250-400 ℃, and the change rate of the temperature is less than or equal to a limit value, for example, the limit value can be set to 0.2 ℃/s;
condition 2: NO (NO) x The signal value of 1 is within the upper and lower limits, the upper and lower limits can be 300 ppm-1500 ppm, and NO x 1 is equal to or less than a limit value, which may be set to 20ppm/s;
condition 3: NO (NO) x 1 and NO x 2 the sensor signal status is valid; NO (NO) x The sensor sends an effective signal to the ECU, and whether the state is effective is judged according to the signal sent by the NOx sensor;
condition 4: the exhaust gas flow rate can be set to be 300 kg/h-1500 kg/h within the upper and lower limit ranges, and the upper and lower limit ranges of different types can be determined according to actual conditions;
condition 5: the rotating speed and the torque are respectively in the upper and lower limit ranges, for example, the rotating speed is 1000 rpm-1800 rpm, and the torque percentage is 10-80%;
when the conditions 1-5 are all satisfied, starting to judge the SCR conversion efficiency, wherein the specific judging process is as follows:
referring to fig. 2, fig. 2 is a flowchart of a method for diagnosing selective catalytic reduction conversion efficiency according to an embodiment of the present application, including:
s201, NO is carried out x Efficiency failure and NH 3 And judging leakage faults.
Due to the postposition of NO x And NH 3 Sensor, can solve NO x The cross sensitivity of the sensor can be used to calculate the true NO downstream of the SCR according to equation (1) x The value of the sum of the values,is NO x Sensor pair NH 3 The cross-sensitivity coefficient, NOx_snr, is the NOx sensor measurement, including NO x Measurement value and NH 3 Measured value of NH3 is NH 3 NH measured by sensor 3 Values. />
When conditions 1-5 are all met, calculating an accumulated downstream NOx sensor value based on the calculated actual SCR downstream NOx value and the amount of exhaust gas; according to NO x 1 sensor and exhaust gas amount calculation accumulated upstream NO x A value; calculation of NO from SCR downstream model NOx and exhaust gas quantity x Emission limit, SCR downstream model NO x Value calculation accumulated downstream NO x Model values, the kinetic equations involved in the SCR model include NO x Reaction equation, ammonia adsorption reaction equation, ammonia desorption reaction equation, ammonia storage oxidation reaction equation and N 2 O generates a reaction equation to calculate the downstream NO x ModelA value; and calculating power according to the rotating speed and the torque, calculating an accumulated value, and resetting the integral when the diagnosis condition is not met or the diagnosis is completed.
NO is performed x The method for judging the efficiency fault can be to calculate NO x Efficiency and measured NO x The efficiency is poor to obtain a first difference value; if the first difference is greater than the fourth limit and the accumulated engine power is greater than the fifth limit, determining NO x Efficiency fails. For example, by calculating NO x Efficiency and measured NO x Poor efficiency and NO calculated x Comparing the limits determined by the efficiency lookup table, and when the deviation is greater than the limit and the accumulated engine power exceeds the limit, then considering NO x Efficiency fails. The fourth and fifth limits may be set according to the actual situation.
Performing NH 3 The leakage fault judging method can be used for judging the measured NH 3 Whether the concentration ratio emission is greater than the calculated NH 3 Concentration ratio of discharge, if measured NH 3 Concentration ratio emission greater than calculated NH 3 Concentration ratio is discharged and accumulated engine power exceeds a fifth limit, NH is determined 3 Leakage failure. For example, when measured NH 3 Concentration ratio emission greater than calculated NH 3 After the concentration ratio is exhausted and the accumulated engine power exceeds the limit value, NH is considered 3 Leakage failure. The cumulative engine power limit value may be set according to the actual situation.
S202, judging NO x Efficiency failure and NH 3 If the leakage faults are satisfied simultaneously, the step 203 is entered, otherwise, the step 201 is entered.
S203, judging NH 3 If the sensor signal is smaller than the first limit value, the process proceeds to step S204, otherwise, the process proceeds to step S201.
S204, ammonia reserves and NO x And (5) judging conversion efficiency.
S205, judging whether the ammonia storage amount is larger than a second limit value, if so, proceeding to step S206, otherwise proceeding to step S207.
S206, reporting sulfur poisoning faults.
S207, judging the filtered NO x If the conversion efficiency is less than the third limit value, the step S208 is entered, otherwise the step S205 is entered.
S208, judging that the selective catalytic reduction conversion efficiency fails.
The above steps are according to NO x 1 and true downstream NO x Calculating real-time NO x Conversion of (2) and NO x Conversion efficiency and according to NO x And NH 3 Mass ratio of NO x The conversion is converted into the ammonia storage amount consumed currently, and the ammonia storage amount is obtained after integration. In the calculation, when the ammonia storage amount is greater than the ammonia storage second limit value determined based on the temperature, the ammonia storage amount is considered to be sulfur poisoning, and a sulfur poisoning fault is reported. The second limit value may be set according to the actual situation. Thus, the influence of sulfur poisoning on the accuracy of the diagnosis of the selective catalytic reduction conversion efficiency can be avoided.
When the ammonia storage is less than the ammonia storage second limit determined based on temperature, and the filtered NO x And if the conversion efficiency is smaller than the third limit value, the SCR cracking part is considered to report the failure of the SCR efficiency. The third limit may be set according to the actual situation.
Referring to fig. 3, fig. 3 is a flow chart of ammonia storage determination according to an embodiment of the present application, when ammonia storage determination is started, urea injection is stopped, and then NH is performed 3 The sensor signal is judged, and if the sensor signal is smaller than the first limit value, ammonia storage and NO are carried out x Judging conversion efficiency; when the ammonia storage is greater than the ammonia storage second limit value determined based on temperature, the ammonia storage is considered to be sulfur poisoning, and a sulfur poisoning fault is reported; if the ammonia reserve is less than or equal to the second limit and the filtered NO x If the conversion efficiency is smaller than the third limit value, judging that the selective catalytic reduction conversion efficiency is faulty, and if the filtered NO x The ammonia storage and NO are re-performed if the conversion efficiency is not less than the third limit value x And (5) judging conversion efficiency.
The embodiment of the application provides a selective catalytic reduction conversion efficiency diagnosis method and device. In performing the method, NO is first performed x Efficiency failure and NH 3 Judging leakage faults; when NO x Efficiency failure and NH 3 When the leakage fault is satisfied at the same time,and when NH 3 After the sensor signal is smaller than the first limit value, judging ammonia storage and NOx conversion efficiency; if the ammonia reserve is greater than the second limit, determining sulfur poisoning; if the ammonia reserve is less than or equal to the second limit and the filtered NO x And if the conversion efficiency is smaller than the third limit value, judging that the conversion efficiency of the selective catalytic reduction is faulty. Thus, through NO x Efficiency failure and NH 3 Leakage fault judgment can accurately identify the characteristics of cracked parts of the selective catalytic reduction device, and interference caused by sulfur poisoning is considered, and through judgment of ammonia reserves, interference caused by sulfur poisoning is avoided, so that the selective catalytic reduction conversion efficiency diagnosis is more accurate. Therefore, the problem of low accuracy of the selective catalytic reduction conversion efficiency diagnosis in the prior art can be solved.
Alternative embodiments of the application obtain the calculated NO x Efficiency and measured NO x The efficiency can be achieved by the following method:
based on accumulated downstream NO x Sensor value and accumulated upstream NO x Value acquisition of measured NO x The efficiency is expressed as:ΣNOx ture for accumulated downstream NO x Sensor value Σnox us For accumulated upstream NO x A value;
based on accumulated downstream NO x Model value and accumulated upstream NO x Value obtaining calculated NO x The efficiency is expressed as:ΣNOx mdl for accumulated downstream NO x Model value Σnox us For accumulated upstream NO x Values.
Obtaining measured NH 3 Concentration ratio emission and calculated NH 3 The concentration ratio discharge can be achieved by the following method:
using measured NH 3 The formula of concentration ratio emission obtains measured NH 3 Concentration ratio of discharged, measured NH 3 The formula of the concentration ratio emission is:ΣNH3 act for NH pair 3 Integration of the signal, Σpwr is the integration of the power;
using calculated NH 3 The concentration ratio emission formula obtains the calculated NH 3 Concentration ratio of emissions, calculated NH 3 The formula of the concentration ratio emission is:∑NH3 MAP for NH obtained from a two-dimensional linear interpolation table of preset airspeed and temperature 3 The integral of the concentration ratio emission limit, Σt, is the integral over time.
Referring to fig. 4, fig. 4 is a schematic diagram of an SCR conversion efficiency diagnosis process according to an embodiment of the present application, wherein the SCR temperature, the exhaust gas amount, the engine speed, the torque and the NO are obtained first x Signals, etc., binding to upstream NO x Sensor signal, downstream NO x Sensor signal acquisition of calculated NO x Efficiency and measured NO x Efficiency is improved; and bind downstream NO x Sensor signal, downstream NH 3 Sensor signal acquisition measured NH 3 Concentration ratio emission and calculated NH 3 Concentration ratio is discharged, then according to NO x Efficiency failure and NH 3 Judging ammonia storage according to leakage faults and according to ammonia storage quantity and NO x And (5) performing fault judgment on the conversion efficiency.
The above is some specific implementation manners of a selective catalytic reduction conversion efficiency diagnosis method provided by the embodiment of the application, and based on this, the application also provides a corresponding selective catalytic reduction conversion efficiency diagnosis device. The apparatus provided by the embodiment of the present application will be described in terms of functional modularization.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a selective catalytic reduction conversion efficiency diagnostic device according to an embodiment of the present application, where the device includes a fault determining module 501 and an efficiency determining module 502;
the fault judging module 501 for NO production x Efficiency failure and NH 3 Judging leakage faults;
the efficiency determination module 502 is configured to determine, when NO x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 After the sensor signal is less than the first limit, ammonia storage and NO are performed x Judging conversion efficiency; if the ammonia reserve is greater than the second limit, determining sulfur poisoning; if the ammonia reserve is less than or equal to the second limit and the filtered NO x And if the conversion efficiency is smaller than the third limit value, judging that the conversion efficiency of the selective catalytic reduction is faulty.
The embodiment of the application provides a selective catalytic reduction conversion efficiency diagnosis device which is used for performing corresponding selective catalytic reduction conversion efficiency diagnosis. In performing the method, NO is first performed x Efficiency failure and NH 3 Judging leakage faults; when NO x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 After the sensor signal is less than the first limit, ammonia storage and NO are performed x Judging conversion efficiency; if the ammonia reserve is greater than the second limit, determining sulfur poisoning; if the ammonia reserve is less than or equal to the second limit and the filtered NO x And if the conversion efficiency is smaller than the third limit value, judging that the conversion efficiency of the selective catalytic reduction is faulty. Thus, through NO x Efficiency failure and NH 3 Leakage fault judgment can accurately identify the characteristics of cracked parts of the selective catalytic reduction device, and interference caused by sulfur poisoning is considered, and through judgment of ammonia reserves, interference caused by sulfur poisoning is avoided, so that the selective catalytic reduction conversion efficiency diagnosis is more accurate. Therefore, the problem of low accuracy of the selective catalytic reduction conversion efficiency diagnosis in the prior art can be solved.
Further, the fault determining module 501 is specifically configured to:
for calculated NO x Efficiency and measured NO x The efficiency is poor to obtain a first difference value; if the first difference is greater than the fourth limit and the accumulated engine power is greater than the fifth limit, determining NO x Efficiency fails.
Further, the fault determining module 501 is specifically configured to:
judging measured NH 3 Whether the concentration ratio emission is greater than the calculated NH 3 Concentration ratio of discharge, if measured NH 3 Concentration ratio emission greater than calculated NH 3 Concentration ratio is discharged and accumulated engine power exceeds a fifth limit, NH is determined 3 Leakage failure.
Further, the device further comprises a calculation module, wherein the calculation module is specifically configured to:
based on accumulated downstream NO x Sensor value and accumulated upstream NO x Value acquisition of measured NO x The efficiency is expressed as:∑NOx ture for accumulated downstream NO x Sensor value, Σnox us For accumulated upstream NO x A value;
based on accumulated downstream NO x Model value and accumulated upstream NO x Value obtaining calculated NO x The efficiency is expressed as:∑NOx mdl for accumulated downstream NO x Model value, Σnox us For accumulated upstream NO x Values.
Further, the computing module is specifically configured to:
using measured NH 3 The formula of concentration ratio emission obtains measured NH 3 Concentration ratio of discharged, measured NH 3 The formula of the concentration ratio emission is:∑NH3 act for NH pair 3 Integration of the signal, Σpwr is the integration of the power;
using calculated NH 3 The concentration ratio emission formula obtains the calculated NH 3 Concentration ratio of emissions, calculated NH 3 The formula of the concentration ratio emission is:∑NH3 MAP for NH obtained from a two-dimensional linear interpolation table of preset airspeed and temperature 3 The concentration ratio is integrated with the emission limit, Σt is integrated over time.
The "first" and "second" in the names of the "first limit", "second limit", and the like in the embodiments of the present application are used for name identification, and do not represent the first and second in sequence.
From the above description of embodiments, it will be apparent to those skilled in the art that all or part of the steps of the above described example methods may be implemented in software plus general hardware platforms. Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, which may be stored in a storage medium, such as a read-only memory (ROM)/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network communication device such as a router) to perform the method according to the embodiments or some parts of the embodiments of the present application.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
The foregoing description of the exemplary embodiments of the application is merely illustrative of the application and is not intended to limit the scope of the application.
Claims (10)
1. A method for diagnosing selective catalytic reduction conversion efficiency, the method comprising:
NO is performed x Efficiency failure and NH 3 Judging leakage faults;
when NO x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 After the sensor signal is less than the first limit, ammonia storage and NO are performed x Judging conversion efficiency;
if the ammonia reserve is greater than the second limit, determining sulfur poisoning;
if the ammonia reserve is less than or equal to the second limit and the filtered NO x And if the conversion efficiency is smaller than the third limit value, judging that the conversion efficiency of the selective catalytic reduction is faulty.
2. The method according to claim 1, characterized in that NO is performed x The method for judging the efficiency faults specifically comprises the following steps:
for calculated NO x Efficiency and measured NO x The efficiency is poor to obtain a first difference value; if the first difference is greater than the fourth limit and the accumulated engine power is greater than the fifth limit, determining NO x Efficiency fails.
3. The method according to claim 1, characterized in that NH is performed 3 The leakage fault judging method specifically comprises the following steps:
judging measured NH 3 Whether the concentration ratio emission is greater than the calculated NH 3 Concentration ratio of discharge, if measured NH 3 Concentration ratio emission greater than calculated NH 3 And if the concentration ratio is exhausted and the accumulated engine power exceeds the fifth limit value, judging that the NH3 leakage fault exists.
4. The method according to claim 2, characterized in that the calculated NO is obtained x Efficiency and measured NO x The method for efficiency specifically comprises the following steps:
based on accumulated downstream NO x Sensor value and accumulated upstream NO x Value acquisition of measured NO x The efficiency is expressed as:∑NOx ture for accumulated downstream NO x Sensor value, Σnox us For accumulated upstream NO x A value;
based on accumulated downstream NO x Model value and accumulated upstream NO x Value obtaining calculated NO x The efficiency is expressed as:∑NOx mdl for accumulated downstream NO x Model value, Σnox us For accumulated upstream NO x Values.
5. A method according to claim 3, characterized in that measured NH is obtained 3 Concentration ratio emission and calculated NH 3 The concentration ratio emission method specifically comprises the following steps:
using measured NH 3 The formula of concentration ratio emission obtains measured NH 3 Concentration ratio of discharged, measured NH 3 The formula of the concentration ratio emission is:∑NH3 act for NH pair 3 Integration of the signal, Σpwr is the integration of the power;
using calculated NH 3 The concentration ratio emission formula obtains the calculated NH 3 Concentration ratio of emissions, calculated NH 3 The formula of the concentration ratio emission is:∑NH3 MAP for NH obtained from a two-dimensional linear interpolation table of preset airspeed and temperature 3 The concentration ratio is integrated with the emission limit, Σt is integrated over time.
6. A selective catalytic reduction conversion efficiency diagnostic device, the device comprising: a fault judging module and an efficiency judging module;
the fault judging module is used for carrying out NO x Efficiency failure and NH 3 Judging leakage faults;
the efficiency judging module is used for judging the efficiency of the engine when NO x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 After the sensor signal is less than the first limit, ammonia storage and NO are performed x Judging conversion efficiency; if the ammonia reserve is greater than the second limit, determining sulfur poisoning; if the ammonia reserve is less than or equal to the second limit and the filtered NO x And if the conversion efficiency is smaller than the third limit value, judging that the conversion efficiency of the selective catalytic reduction is faulty.
7. The apparatus of claim 6, wherein the failure determination module is specifically configured to:
for calculated NO x Efficiency and measured NO x The efficiency is poor to obtain a first difference value; if the first difference is greater than the fourth limit and the accumulated engine power is greater than the fifth limit, determining NO x Efficiency fails.
8. The apparatus of claim 6, wherein the failure determination module is specifically configured to:
judging measured NH 3 Whether the concentration ratio emission is greater than the calculated NH 3 Concentration ratio of discharge, if measured NH 3 Concentration ratio emission greater than calculated NH 3 Concentration ratio is discharged and accumulated engine power exceeds a fifth limit, NH is determined 3 Leakage failure.
9. The apparatus of claim 7, further comprising a computing module, the computing module being configured to:
based on accumulated downstream NO x Sensor value and accumulated upstream NO x Value acquisition of measured NO x The efficiency is expressed as:∑NOx ture for accumulated downstream NO x Sensor value, Σnox us For accumulated upstream NO x A value;
based on accumulated downstream NO x Model value and accumulated upstream NO x Value obtaining calculated NO x The efficiency is expressed as:∑NOx mdl for accumulated downstream NO x Model value, Σnox us For accumulated upstream NO x Values.
10. The apparatus of claim 8, wherein the computing module is specifically configured to:
using measured NH 3 The formula of concentration ratio emission obtains measured NH 3 Concentration ratio of discharged, measured NH 3 The formula of the concentration ratio emission is:∑NH3 act for NH pair 3 Integration of the signal, Σpwr is the integration of the power;
using calculated NH 3 The concentration ratio emission formula obtains the calculated NH 3 Concentration ratio of emissions, calculated NH 3 The formula of the concentration ratio emission is:∑NH3 MAP for NH obtained from a two-dimensional linear interpolation table of preset airspeed and temperature 3 The concentration ratio is integrated with the emission limit, Σt is integrated over time.
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