CN114961956A - Method and device for diagnosing conversion efficiency of selective catalytic reduction - Google Patents
Method and device for diagnosing conversion efficiency of selective catalytic reduction Download PDFInfo
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- CN114961956A CN114961956A CN202210789206.1A CN202210789206A CN114961956A CN 114961956 A CN114961956 A CN 114961956A CN 202210789206 A CN202210789206 A CN 202210789206A CN 114961956 A CN114961956 A CN 114961956A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 86
- 238000010531 catalytic reduction reaction Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 39
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 132
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 53
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 26
- 231100000572 poisoning Toxicity 0.000 claims abstract description 26
- 230000000607 poisoning effect Effects 0.000 claims abstract description 26
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 26
- 239000011593 sulfur Substances 0.000 claims abstract description 26
- 238000011144 upstream manufacturing Methods 0.000 claims description 27
- 230000010354 integration Effects 0.000 claims description 15
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims description 13
- 238000003745 diagnosis Methods 0.000 abstract description 22
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- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
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- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 description 2
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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
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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
- 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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- 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 method and a device for diagnosing conversion efficiency of selective catalytic reduction. In carrying out the method, NO is carried out first x Efficiency failure and NH 3 Judging leakage faults; when NO is present x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 When the sensor signal is less than the first limit value, ammonia storage and NO are performed x Judging the conversion efficiency; if the ammonia storage amount is larger than a second limit value, determining sulfur poisoning; if the ammonia storage is less than or equal to the second limit and the filtered NO x If the conversion efficiency is less than the third limit, it is determined that the selective catalytic reduction conversion efficiency is faulty. Thus passing NO x Efficiency failure and NH 3 Leakage fault judgment can accurately identify the characteristics of cracking pieces of the selective catalytic reduction device, and the interference caused by sulfur poisoning is avoided, so that the diagnosis of the conversion efficiency of selective catalytic reduction is more accurate. Therefore, the problem of low accuracy of 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 method and a device for diagnosing conversion efficiency of selective catalytic reduction.
Background
Automotive exhaust pollution is environmental pollution caused by exhaust gas emitted from automobiles. The main pollutants are carbon monoxide, hydrocarbon, oxynitride, sulfur dioxide, lead-containing compound, particulate matter and the like. In addition, the atmospheric problems of greenhouse effect, ozone layer destruction and acid rain are made more serious by carbon dioxide, sulfides, nitrogen oxides, chlorofluorohydrogen and the like emitted from automobiles, and therefore the main goal of reducing the exhaust emission of automobiles is to reduce the emission of nitrogen oxides and soot particles.
The selective catalytic reduction conversion device in the diesel engine post-treatment is responsible for reducing NO harmful to the environment in the tail gas x Reduction to N 2 To satisfy ultra-low NO x Emissions and future execution of national emission standards, NH 3 Sensors are preferred for meeting emission consistency. The prior art does not exclude NH when testing the conversion efficiency of a selective catalytic reduction converter 3 Resulting in less accurate diagnosis of the selective catalytic reduction conversion efficiency.
Therefore, how to improve the accuracy of the selective catalytic reduction conversion efficiency diagnosis becomes a technical problem which needs to be solved urgently in the field.
Disclosure of Invention
In view of this, embodiments of the present application provide a method and an apparatus for diagnosing selective catalytic reduction conversion efficiency, which aim to solve the problem of low accuracy of diagnosing selective catalytic reduction conversion efficiency in the prior art.
In a first aspect, embodiments of the present application provide a selective catalytic reduction conversion efficiency diagnostic method, including:
carrying out NO x Efficiency failure and NH 3 Judging leakage faults;
when NO is present x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 Sensor signal less thanAfter a limit, ammonia storage and NO are carried out x Judging the conversion efficiency;
if the ammonia storage amount is larger than a second limit value, determining sulfur poisoning;
if the ammonia storage is less than or equal to the second limit and the filtered NO x If the conversion efficiency is less than the third limit, it is determined that the selective catalytic reduction conversion efficiency is faulty.
Optionally, carrying out NO x The method for judging the efficiency fault specifically comprises the following steps:
for calculated NO x Efficiency and measured NO x Obtaining a first difference value by making difference of the efficiency; if the first difference is greater than the fourth limit and the accumulated engine power is greater than the fifth limit, then NO is determined x The efficiency is lost.
Optionally, carrying out NH 3 The method for judging the leakage fault specifically comprises the following steps:
determining measured NH 3 Whether the concentration ratio emission is greater than the calculated NH 3 Specific concentration of emitted NH if measured 3 Specific concentration emission greater than calculated NH 3 NH is determined if the concentration ratio is greater than the fifth limit and the accumulated engine power exceeds the fifth limit 3 A leak failure.
Optionally, obtaining the calculated NO x Efficiency and measured NO x The method of efficiency specifically comprises:
according to accumulated downstream NO x Sensor values and accumulated upstream NO x Value obtaining measured NO x Efficiency, the formula is:
∑NOx ture is accumulated downstream NO x Sensor value, ∑ NOx us Is accumulated upstream NO x A value;
according to accumulated downstream NO x Model values and accumulated upstream NO x Value obtaining calculated NO x Efficiency, the formula is:
∑NOx mdl as accumulated downstream NO x Model (model)Value, ∑ NOx us Is accumulated upstream NO x The value is obtained.
Optionally, obtaining measured NH 3 Specific concentration emission and calculated NH 3 The concentration ratio discharge method specifically comprises the following steps:
using measured NH 3 Formula for concentration ratio emission yields measured NH 3 Specific concentration discharge, measured NH 3 The formula for concentration ratio discharge is:
∑NH3 act to NH 3 Integrating the signal, wherein sigma pwr is the integration of the power;
using calculated NH 3 Formula for concentration ratio emission yields calculated NH 3 Specific concentration of emitted gas, said calculated NH 3 The formula for concentration ratio discharge is:
∑NH3 MAP for obtaining NH according to a preset airspeed and temperature two-dimensional linear interpolation table 3 Concentration is integrated over the emission limit, Σ t is integrated over time.
In a second aspect, embodiments of the present application provide a selective catalytic reduction conversion efficiency diagnostic apparatus, including: the system comprises a fault judgment module and an efficiency judgment module;
the fault judgment module is used for carrying out NO x Efficiency failure and NH 3 Judging leakage faults;
the efficiency judging module is used for judging whether NO is available x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 When the sensor signal is less than the first limit value, ammonia storage and NO are performed x Judging the conversion efficiency; if the ammonia storage amount is larger than a second limit value, determining sulfur poisoning; if the ammonia storage is less than or equal to the second limit and the filtered NO x If the conversion efficiency is less than the third limit, it is determined that the selective catalytic reduction conversion efficiency is faulty.
Optionally, the fault determining module is specifically configured to:
for calculated NO x Efficiency and measured NO x Obtaining a first difference value by making difference of the efficiency; if the first difference is greater than the fourth limit and the accumulated engine power is greater than the fifth limit, then NO is determined x The efficiency is lost.
Optionally, the fault determining module is specifically configured to:
determining measured NH 3 Whether the concentration ratio emission is greater than the calculated NH 3 Specific concentration of emitted NH if measured 3 Specific concentration emission greater than calculated NH 3 NH is determined if the concentration ratio is greater than the fifth limit and the accumulated engine power exceeds the fifth limit 3 A leak failure.
Optionally, the apparatus further includes a calculation module, where the calculation module is specifically configured to:
according to accumulated downstream NO x Sensor values and accumulated upstream NO x Value obtaining measured NO x Efficiency, the formula is:
∑NOx ture is accumulated downstream NO x Sensor value, ∑ NOx us Is accumulated upstream NO x A value;
according to accumulated downstream NO x Model values and accumulated upstream NO x Value obtaining calculated NO x Efficiency, the formula is:
∑NOx mdl as accumulated downstream NO x Model value, ∑ NOx us Is accumulated upstream NO x The value is obtained.
Optionally, the calculation module is specifically configured to:
using measured NH 3 Formula for concentration ratio emission yields measured NH 3 Specific concentration discharge, measured NH 3 The formula for concentration ratio discharge is:
∑NH3 act to NH 3 Integration of the signal, Σpwr is the integral of power;
using calculated NH 3 Formula for concentration ratio emission yields calculated NH 3 Specific concentration of emitted gas, said calculated NH 3 The formula for concentration ratio emission is:
∑NH3 MAP for obtaining NH according to a preset airspeed and temperature two-dimensional linear interpolation table 3 Integration of concentration versus emission limit, ∑ t is the integration over time.
The embodiment of the application provides a method and a device for diagnosing conversion efficiency of selective catalytic reduction. In carrying out the method, NO is carried out first x Efficiency failure and NH 3 Judging leakage faults; when NO is present x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 When the sensor signal is less than the first limit value, ammonia storage and NO are performed x Judging the conversion efficiency; if the ammonia storage amount is larger than a second limit value, determining sulfur poisoning; if the ammonia storage is less than or equal to the second limit and the filtered NO x If the conversion efficiency is less than the third limit, it is determined that the selective catalytic reduction conversion efficiency is faulty. Thus, passing NO x Efficiency failure and NH 3 Leakage fault judgment can accurately identify the characteristics of cracking pieces of the selective catalytic reduction device, and considering the possible interference caused by sulfur poisoning, the interference caused by sulfur poisoning is avoided through judgment of ammonia reserves, so that the diagnosis of the conversion efficiency of selective catalytic reduction is more accurate. Therefore, the problem of low accuracy of selective catalytic reduction conversion efficiency diagnosis in the prior art can be solved.
Drawings
To illustrate the technical solutions in the present embodiment or the prior art more clearly, the drawings needed to be used in the description of the embodiment or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the spatial position and signal relationship of sensors according to the present disclosure;
FIG. 2 is a flow chart of a method for diagnosing SCR conversion efficiency according to an embodiment of the present disclosure;
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 provided by an embodiment of the present application;
fig. 5 is a schematic structural diagram of a selective catalytic reduction conversion efficiency diagnostic apparatus according to an embodiment of the present application.
Detailed Description
Automotive exhaust pollution is environmental pollution caused by exhaust gas emitted from automobiles. The main pollutants are carbon monoxide, hydrocarbon, oxynitride, sulfur dioxide, lead-containing compound, particulate matter and the like. In addition, the atmospheric problems of greenhouse effect, ozone layer destruction and acid rain become more serious by carbon dioxide, sulfide, nitrogen oxide, chlorofluorohydrogen and the like emitted from automobiles, and therefore the main goal of reducing the exhaust emission of motor vehicles is to reduce the emission of nitrogen oxide and soot particulates.
The Selective Catalytic Reduction (SCR) device in the aftertreatment of the diesel engine is responsible for removing NO harmful to the environment in the tail gas x Reduction to N 2 ，NO x Is NO and NO in automobile exhaust 2 To satisfy ultra-low NO x Emissions and future execution of national emission standards, NH 3 Sensors are preferred for meeting emission consistency. The prior art does not exclude NH when detecting SCR conversion efficiency 3 Resulting in a less accurate diagnosis of the SCR conversion efficiency.
In view of this, the inventors of the present application considered that if NH could be introduced 3 Sensor signal for distinguishing NO x Cross-sensitivity of sensors, binding NO x Efficiency determination and NH 3 The leakage judgment can accurately identify the characteristics of the SCR cracking piece; considering that sulfur poisoning influences the judgment accuracy when the SCR conversion efficiency is judged, if the sulfur poisoning can be judgedThe ammonia storage judgment can be introduced, the interference of sulfur poisoning to the detection result can be avoided, and the accuracy of SCR conversion efficiency diagnosis can be improved.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Before describing aspects of the present application, the technology related to the present application will be described to facilitate understanding of the aspects of the present application.
Referring to fig. 1, fig. 1 is a schematic diagram of spatial positions and signal relationships of sensors in the solution provided by the present application, a temperature sensor and NO are installed before SCR1 x 1 sensor and jet nozzle DM1, tail pipe ASC rear mounted NH 3 Sensor, NO x 2 sensor and temperature sensor.
SCR conversion efficiency diagnostics include NH 3 Sensor signal diagnostics, NO x Efficiency diagnostics and ammonia storage diagnostics.
Before the SCR conversion efficiency diagnosis, it is necessary to determine whether the efficiency diagnosis condition is satisfied, and the determination condition mainly includes: SCR temperature, exhaust gas quantity, engine speed, torque and NO x Signals, etc.
Condition 1: calculating the average temperature of the SCR according to the temperatures of the SCR1 upstream and the ASC downstream, wherein the average temperature is in an upper-lower limit range, 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 be 0.2 ℃/s;
condition 2: NO x 1 signal value is in the upper and lower limit range, the upper and lower limit can be 300 ppm-1500 ppm, and NO x The rate of change of 1 is not more than a limit value, which can be set to 20 ppm/s;
condition 3: NO x 1 and NO x 2, the signal state of the sensor is effective; NO x The sensor sends an effective signal to the ECU, and the state is judged according to the signal sent by the NOx sensorWhether the state is valid;
condition 4: the waste gas flow rate can be set to be 300 kg/h-1500 kg/h in the upper and lower limit ranges, for example, the upper and lower limit ranges of different types are different and 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 met, the SCR conversion efficiency is judged, and the specific judgment process is as follows:
referring to fig. 2, fig. 2 is a flowchart of a method for diagnosing a conversion efficiency of selective catalytic reduction according to an embodiment of the present application, including:
s201, carrying out NO x Efficiency failure and NH 3 And (5) judging leakage faults.
Due to the post NO x And NH 3 Sensor capable of solving NO x The cross sensitivity of the sensor, according to the formula (1), can calculate the real NO downstream of the SCR x The value of the one or more of the one,
is NO x Sensor pair NH 3 Cross sensitivity factor, NOx _ snr, is a NOx sensor measurement, including NO x Measured value and NH 3 Measured value, NH3 is NH 3 NH measured by sensor 3 The value is obtained.
When the conditions 1-5 are all satisfied, calculating an accumulated downstream NOx sensor value according to the calculated real SCR downstream NOx value and the exhaust gas amount; according to NO x 1 sensor and exhaust gas quantity calculation cumulative upstream NO x A value; calculating NO from SCR downstream model NOx and exhaust gas amount x Emission limit, SCR downstream model NO x Value calculation accumulated downstream NO x Model values, SCR model relates to kinetic equations including NO x Reaction equation, ammonia adsorption reaction equation, ammonia desorption reaction equation, ammonia storage oxidation reaction equation and N 2 O formation reaction equation, downstream NO can be calculated x A model value; power is calculated from the speed and torque and an accumulated value is calculated, and the integral is reset when the diagnostic condition is not satisfied beyond a certain limit or the diagnosis is complete.
Carrying out NO x The method for efficiency fault determination may be for calculated NO x Efficiency and measured NO x Obtaining a first difference value by making difference of the efficiency; if the first difference is greater than the fourth limit and the accumulated engine power is greater than the fifth limit, NO is determined x The efficiency is lost. E.g. by counting NO x Efficiency and measured NO x Efficiency is poor and compared with calculated NO x Comparing the limits determined by the efficiency look-up table, and considering NO when the deviation is greater than the limit and the accumulated engine power exceeds the limit x The efficiency is lost. The fourth limit and the fifth limit may be set according to actual conditions.
By carrying out NH 3 The method of leak failure determination may be to determine a measured NH 3 Whether the concentration ratio emission is greater than the calculated NH 3 Specific concentration of emitted NH if measured 3 Specific concentration emission greater than calculated NH 3 NH is determined if the concentration ratio is greater than the fifth limit and the accumulated engine power exceeds the fifth limit 3 A leak failure. For example, when measured NH 3 Specific concentration emission greater than calculated NH 3 After the concentration ratio is discharged and the accumulated engine power exceeds the limit value, NH is considered 3 A leak failure. The cumulative engine power limit value here may also be set according to actual conditions.
S202, judging NO x Efficiency failure and NH 3 And (4) whether the leakage faults are simultaneously met or not, if so, entering the step (203), and otherwise, entering the step (201).
S203, judging NH 3 And (5) whether the sensor signal is smaller than a first limit value, if so, entering step S204, otherwise, entering step S201.
S204, carrying out ammonia storage and NO x And (6) judging the conversion efficiency.
S205, judging whether the ammonia storage amount is larger than a second limit value, if so, entering a step S206, otherwise, entering a step S207.
And S206, reporting sulfur poisoning faults.
S207, judging NO after filtering x If the conversion efficiency is less than the third limit, the process proceeds to step S208, otherwise, the process proceeds to step S205.
And S208, judging that the selective catalytic reduction conversion efficiency is failed.
The above steps are according to NO x 1 and true downstream NO x Calculating real-time NO x Conversion amount of (2) and NO x Conversion efficiency according to NO x And NH 3 Mass ratio of NO x The conversion amount is converted into the currently consumed ammonia reserve, and the ammonia reserve is obtained after integration. In the calculation, when the ammonia storage amount is larger than the second limit value of the ammonia storage determined based on the temperature, it is considered as sulfur poisoning, and a sulfur poisoning failure is reported. The second limit value may be set according to actual conditions. Thus, the influence of sulfur poisoning on the diagnosis accuracy of the selective catalytic reduction conversion efficiency can be avoided.
When the ammonia storage amount is less than the second limit value of the ammonia storage determined based on the temperature and the NO after filtering x And if the conversion efficiency is less than the third limit value, the SCR cracking piece is considered, and SCR efficiency failure is reported. The third limit value may be set according to actual conditions.
Referring to fig. 3, fig. 3 is a flow chart illustrating ammonia storage determination according to an embodiment of the present disclosure, when ammonia storage determination is started, urea injection is stopped, and then NH is injected 3 The sensor signal is judged, if the sensor signal is less than a first limit value, the ammonia storage amount and NO are carried out x Judging the conversion efficiency; when the ammonia storage amount is larger than a second limit value of the ammonia storage determined based on the temperature, the sulfur poisoning is considered to be sulfur poisoning, and a sulfur poisoning fault is reported; if the ammonia storage is less than or equal to the second limit and the filtered NO x If the conversion efficiency is less than the third limit value, judging that the selective catalytic reduction conversion efficiency is failed, and if the filtered NO is less than the third limit value, judging that the selective catalytic reduction conversion efficiency is failed x If the conversion efficiency is not less than the third limit, the ammonia storage amount and NO are resumed x And (6) judging the conversion efficiency.
The embodiment of the application provides a method and a device for diagnosing conversion efficiency of selective catalytic reduction. In carrying out the method, NO is carried out first x Efficiency failure and NH 3 Judging leakage faults; when NO is present x Efficiency failure and NH 3 Leak failureWhen both are satisfied, and when NH 3 Judging the ammonia storage amount and the NOx conversion efficiency when the sensor signal is smaller than a first limit value; if the ammonia storage amount is larger than a second limit value, determining sulfur poisoning; if the ammonia storage is less than or equal to the second limit and the filtered NO x If the conversion efficiency is less than the third limit, it is determined that the selective catalytic reduction conversion efficiency is faulty. Thus, passing NO x Efficiency failure and NH 3 Leakage fault judgment can accurately identify the characteristics of cracking pieces of the selective catalytic reduction device, and considering the possible interference caused by sulfur poisoning, the interference caused by sulfur poisoning is avoided through judgment of ammonia reserves, so that the diagnosis of the conversion efficiency of selective catalytic reduction is more accurate. Therefore, the problem of low accuracy of selective catalytic reduction conversion efficiency diagnosis in the prior art can be solved.
Alternative embodiment of the present application, obtaining calculated NO x Efficiency and measured NO x The following methods can be used for efficiency:
according to accumulated downstream NO x Sensor values and accumulated upstream NO x Value obtaining measured NO x Efficiency, the formula is:
ΣNOx ture is accumulated downstream NO x Sensor value, sigma NOx us Is accumulated upstream NO x A value;
according to accumulated downstream NO x Model values and accumulated upstream NO x Value obtaining calculated NO x Efficiency, the formula is:
ΣNOx mdl is accumulated downstream NO x Model value, sigma NOx us Is accumulated upstream NO x The value is obtained.
Obtaining measured NH 3 Specific concentration emission and calculated NH 3 The concentration ratio discharge may be performed by the following method:
using measured NH 3 Formula for concentration ratio emission yields measured NH 3 Concentration ratio discharge, said measurementNH of (2) 3 The formula for concentration ratio emission is:
ΣNH3 act to NH 3 Integrating the signal, wherein sigma pwr is the integration of power;
using calculated NH 3 Formula for concentration ratio emission yields calculated NH 3 Specific concentration of emitted gas, said calculated NH 3 The formula for concentration ratio discharge is:
∑NH3 MAP for obtaining NH according to a preset airspeed and temperature two-dimensional linear interpolation table 3 Concentration is integrated over the emission limit, Σ t is integrated over time.
Referring to FIG. 4, FIG. 4 is a schematic diagram of an SCR conversion efficiency diagnostic process provided by an embodiment of the present application, first obtaining SCR temperature, exhaust gas amount, engine speed, torque, and NO x Signal, etc., binding to upstream NO x Sensor signal, downstream NO x Sensor signal acquisition of calculated NO x Efficiency and measured NO x Efficiency; and bind downstream NO x Sensor signal, downstream NH 3 Sensor signal obtaining measured NH 3 Specific concentration emission and calculated NH 3 Specific concentration of NO, then according to NO x Efficiency failure and NH 3 Judging ammonia storage based on leakage failure, and determining ammonia storage amount and NO x And judging the fault of the conversion efficiency.
Based on the specific implementation manners of the selective catalytic reduction conversion efficiency diagnosis method provided in the embodiments of the present application, the present application further provides a corresponding selective catalytic reduction conversion efficiency diagnosis device. The device provided by the embodiment of the present application will be described in terms of functional modularity.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a selective catalytic reduction conversion efficiency diagnosis device provided in an embodiment of the present application, where the device includes a fault determination module 501 and an efficiency determination module 502;
to said effectA barrier judgment module 501 for NO x Efficiency failure and NH 3 Judging leakage faults;
the efficiency determination module 502 is used for determining whether NO is available x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 When the sensor signal is less than the first limit value, ammonia storage and NO are performed x Judging the conversion efficiency; if the ammonia storage amount is larger than a second limit value, determining sulfur poisoning; if the ammonia storage is less than or equal to the second limit and the filtered NO x If the conversion efficiency is less than the third limit, it is determined that the selective catalytic reduction conversion efficiency is faulty.
The embodiment of the application provides a selective catalytic reduction conversion efficiency diagnosis device which is used for executing corresponding selective catalytic reduction conversion efficiency diagnosis. In carrying out the method, NO is carried out first x Efficiency failure and NH 3 Judging leakage faults; when NO is present x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 When the sensor signal is less than the first limit value, ammonia storage and NO are performed x Judging the conversion efficiency; if the ammonia storage amount is larger than a second limit value, determining sulfur poisoning; if the ammonia storage is less than or equal to the second limit and the filtered NO x If the conversion efficiency is less than the third limit, it is determined that the selective catalytic reduction conversion efficiency is faulty. Thus, passing NO x Efficiency failure and NH 3 Leakage fault judgment can accurately identify the characteristics of cracking pieces of the selective catalytic reduction device, and considering the possible interference caused by sulfur poisoning, the interference caused by sulfur poisoning is avoided through judgment of ammonia reserves, so that the diagnosis of the conversion efficiency of selective catalytic reduction is more accurate. Therefore, the problem of low accuracy of 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 Obtaining a first difference value by making difference of the efficiency; if the first difference is greater than the fourth limit and the accumulated engine power is greater than the fifth limit, then NO is determined x The efficiency is lost.
Further, the fault determining module 501 is specifically configured to:
determining measured NH 3 Whether the concentration ratio emission is greater than the calculated NH 3 Specific concentration of emitted NH if measured 3 Specific concentration emission greater than calculated NH 3 The concentration ratio is discharged and the accumulated engine power exceeds the fifth limit value, NH is determined 3 A leak failure.
Further, the apparatus further includes a computing module, and the computing module is specifically configured to:
according to accumulated downstream NO x Sensor values and accumulated upstream NO x Value obtaining measured NO x Efficiency, the formula is:
∑NOx ture is accumulated downstream NO x Sensor value, ∑ NOx us Is accumulated upstream NO x A value;
according to accumulated downstream NO x Model values and accumulated upstream NO x Value obtaining calculated NO x Efficiency, the formula is:
∑NOx mdl is accumulated downstream NO x Model value, ∑ NOx us Is accumulated upstream NO x The value is obtained.
Further, the calculation module is specifically configured to:
using measured NH 3 Formula for concentration ratio emission yields measured NH 3 Specific concentration discharge, measured NH 3 The formula for concentration ratio discharge is:
∑NH3 act to NH 3 Integrating the signal, wherein sigma pwr is the integration of power;
using calculated NH 3 Formula for concentration ratio emission yields calculated NH 3 Specific concentration of emitted gas, said calculated NH 3 The formula for concentration ratio discharge is:
∑NH3 MAP for obtaining NH according to a preset airspeed and temperature two-dimensional linear interpolation table 3 Integration of concentration versus emission limit, ∑ t is the integration over time.
In the embodiments of the present application, the names "first" and "second" in the names "first limit value" and "second limit value" are used only for name identification, and do not represent the first and second in sequence.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a general hardware platform. 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, or the like, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a router) to execute the method according to the embodiments or some parts of the embodiments of the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only an exemplary embodiment of the present application, and is not intended to limit the scope of the present application.
Claims (10)
1. A method of diagnosing selective catalytic reduction conversion efficiency, the method comprising:
carrying out NO x Efficiency failure and NH 3 Judging leakage faults;
when NO is present x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 When the sensor signal is less than the first limit value, ammonia storage and NO are performed x Judging the conversion efficiency;
if the ammonia storage amount is larger than a second limit value, determining sulfur poisoning;
if the ammonia storage is less than or equal to the second limit and the filtered NO x If the conversion efficiency is less than the third limit, it is determined that the selective catalytic reduction conversion efficiency is faulty.
2. The method according to claim 1, wherein NO is carried out x The method for judging the efficiency fault specifically comprises the following steps:
for calculated NO x Efficiency and measured NO x Obtaining a first difference value by making difference of the efficiency; if the first difference is greater than the fourth limit and the accumulated engine power is greater than the fifth limit, then NO is determined x The efficiency is lost.
3. The method of claim 1, wherein NH is performed 3 The method for judging the leakage fault specifically comprises the following steps:
determining measured NH 3 Whether the concentration ratio emission is greater than the calculated NH 3 Specific concentration of emitted NH if measured 3 Specific concentration emission greater than calculated NH 3 The concentration ratio is discharged and the accumulated engine power exceeds the fifth limit value, an NH3 leak fault is determined.
4. Method according to claim 2, wherein the calculated NO is obtained x Efficiency and measured NO x The method of efficiency specifically comprises:
according to accumulated downstream NO x Sensor values and accumulated upstream NO x Value obtaining measured NO x Efficiency, the formula is:
∑NOx ture is accumulated downstream NO x Sensor value, ∑ NOx us Is accumulated upstream NO x A value;
according to accumulated downstream NO x Model values and accumulated upstream NO x Value obtaining calculated NO x Efficiency, the formula is:
∑NOx mdl is accumulated downstream NO x Model value, ∑ NOx us Is accumulated upstream NO x The value is obtained.
5. The method of claim 3, wherein the measured NH is obtained 3 Specific concentration emission and calculated NH 3 The concentration ratio discharge method specifically comprises the following steps:
using measured NH 3 Formula for concentration ratio emission yields measured NH 3 Specific concentration discharge, measured NH 3 The formula for concentration ratio discharge is:
∑NH3 act to NH 3 Integrating the signal, wherein sigma pwr is the integration of power;
using calculated NH 3 Formula for concentration ratio emission yields calculated NH 3 Specific concentration of emitted gas, said calculated NH 3 The formula for concentration ratio discharge is:
∑NH3 MAP for obtaining NH according to a preset airspeed and temperature two-dimensional linear interpolation table 3 Integration of concentration versus emission limit, ∑ t is the integration over time.
6. A selective catalytic reduction conversion efficiency diagnostic apparatus, characterized in that the apparatus comprises: the system comprises a fault judgment module and an efficiency judgment module;
the fault judgment module is used for carrying out NO x Efficiency failure and NH 3 Judging leakage faults;
the efficiency judging module is used for judging whether NO is available x Efficiency failure and NH 3 When leakage faults are simultaneously satisfied, and when NH 3 When the sensor signal is less than the first limit value, ammonia storage and NO are performed x Judging the conversion efficiency; if the ammonia storage amount is larger than a second limit value, determining sulfur poisoning; if the ammonia storage is less than or equal to the second limit and the filtered NO x If the conversion efficiency is less than the third limit, it is determined that the selective catalytic reduction conversion efficiency is faulty.
7. The apparatus according to claim 6, wherein the failure determination module is specifically configured to:
for calculated NO x Efficiency and measured NO x Obtaining a first difference value by making difference of the efficiency; if the first difference is greater than the fourth limit and the accumulated engine power is greater than the fifth limit, then NO is determined x The efficiency is lost.
8. The apparatus according to claim 6, wherein the failure determination module is specifically configured to:
determining measured NH 3 Whether the concentration ratio emission is greater than the calculated NH 3 Specific concentration of emitted, if measured, NH 3 Concentration specific emission greater than calculated NH 3 NH is determined if the concentration ratio is greater than the fifth limit and the accumulated engine power exceeds the fifth limit 3 A leak failure.
9. The apparatus according to claim 7, further comprising a computing module, the computing module being specifically configured to:
according to accumulated downstream NO x Sensor values and accumulated upstream NO x Value obtaining measured NO x Efficiency, the formula is:
∑NOx ture is accumulated downstream NO x Sensor value, ∑ NOx us Is accumulated upstream NO x A value;
according to accumulated downstream NO x Model value and accumulated upstream NO x Value obtaining calculated NO x Efficiency, the formula is:
∑NOx mdl is accumulated downstream NO x Model value, ∑ NOx us Is accumulated upstream NO x The value is obtained.
10. The apparatus of claim 8, wherein the computing module is specifically configured to:
using measured NH 3 Equation of concentration ratio emission yields measured NH 3 Specific concentration discharge, measured NH 3 The formula for concentration ratio discharge is:
∑NH3 act to NH 3 Integrating the signal, wherein sigma pwr is the integration of power;
using calculated NH 3 Formula for concentration ratio emission yields calculated NH 3 Specific concentration of emitted gas, said calculated NH 3 The formula for concentration ratio discharge is:
∑NH3 MAP for obtaining NH according to a preset airspeed and temperature two-dimensional linear interpolation table 3 Integration of concentration versus emission limit, ∑ t is the integration over time.
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Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040098974A1 (en) * | 2002-11-21 | 2004-05-27 | Nieuwstadt Michiel J. Van | Exhaust gas aftertreatment systems |
| US20120085082A1 (en) * | 2010-10-06 | 2012-04-12 | GM Global Technology Operations LLC | System and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systems |
| US20120137657A1 (en) * | 2008-12-12 | 2012-06-07 | Johan Dahl | Scr closed loop control system |
| CN104153858A (en) * | 2013-12-25 | 2014-11-19 | 北京大学工学院包头研究院 | Fault detection method for SCR system catalytic box |
| CN104492211A (en) * | 2014-11-21 | 2015-04-08 | 大连海事大学 | Novel ship exhaust gas multi-pollutant combined removing method and apparatus thereof |
| US20160108791A1 (en) * | 2014-10-16 | 2016-04-21 | Caterpillar Inc. | Aftertreatment Control for Detection of Fuel Contaminant Concentration |
| CN106121797A (en) * | 2016-08-29 | 2016-11-16 | 无锡威孚力达催化净化器有限责任公司 | SCR aftertreatment system NH_3 leakage state judging method |
| CN106437956A (en) * | 2016-09-23 | 2017-02-22 | 上海海事大学 | Fuzzy control method for series selective catalytic reduction system |
| CN106703957A (en) * | 2016-11-29 | 2017-05-24 | 潍柴动力空气净化科技有限公司 | SCR (Selective Catalytic Reduction) catalyst transient characteristic evaluation method and test device for SCR catalyst transient characteristic evaluation |
| US20170167352A1 (en) * | 2015-12-14 | 2017-06-15 | Toyota Jidosha Kabushiki Kaisha | Deterioration diagnosis apparatus for selective catalytic reduction catalyst |
| DE102017201393A1 (en) * | 2017-01-30 | 2018-08-02 | Robert Bosch Gmbh | Method for fault detection in an SCR system by means of ammonia slip |
| JP2018145869A (en) * | 2017-03-06 | 2018-09-20 | いすゞ自動車株式会社 | Exhaust emission control system and sulfur poisoning restriction method for exhaust emission control system |
| CN109763883A (en) * | 2019-02-11 | 2019-05-17 | 无锡威孚力达催化净化器有限责任公司 | A kind of detection method of SCR system ammonia leakage, apparatus and system |
| US20190162094A1 (en) * | 2017-11-30 | 2019-05-30 | GM Global Technology Operations LLC | Control reset and diagnostic to maintain tailpipe compliance |
| CN110284951A (en) * | 2018-03-19 | 2019-09-27 | 通用汽车环球科技运作有限责任公司 | Selective catalytic reduction fault detection |
| CN110645076A (en) * | 2019-09-23 | 2020-01-03 | 华东交通大学 | NH based on model3Leak diagnosis method |
| CN110761882A (en) * | 2019-12-26 | 2020-02-07 | 潍柴动力股份有限公司 | Method and system for judging SCR sulfur poisoning |
| CN110966072A (en) * | 2019-12-24 | 2020-04-07 | 潍柴动力股份有限公司 | Urea concentration fault detection method and device, control equipment and storage medium |
| CN112594044A (en) * | 2020-12-14 | 2021-04-02 | 潍柴动力股份有限公司 | Aging prediction method and device for post-processing system |
| CN113719338A (en) * | 2021-09-27 | 2021-11-30 | 潍柴动力股份有限公司 | SCR sulfur poisoning degree determining method and device, diesel vehicle and medium |
| CN113790094A (en) * | 2021-09-29 | 2021-12-14 | 潍柴动力股份有限公司 | Method, device, vehicle and medium for determining sulfur poisoning of aftertreatment system |
| CN114323692A (en) * | 2021-12-29 | 2022-04-12 | 无锡伟博汽车科技有限公司 | SCR (selective catalytic reduction) low-efficiency fault diagnosis method |
| CN114370319A (en) * | 2022-01-19 | 2022-04-19 | 潍柴动力股份有限公司 | Closed-loop control method and control system of SCR post-treatment system |
-
2022
- 2022-07-06 CN CN202210789206.1A patent/CN114961956B/en active Active
Patent Citations (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040098974A1 (en) * | 2002-11-21 | 2004-05-27 | Nieuwstadt Michiel J. Van | Exhaust gas aftertreatment systems |
| US20120137657A1 (en) * | 2008-12-12 | 2012-06-07 | Johan Dahl | Scr closed loop control system |
| US20120085082A1 (en) * | 2010-10-06 | 2012-04-12 | GM Global Technology Operations LLC | System and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systems |
| CN104153858A (en) * | 2013-12-25 | 2014-11-19 | 北京大学工学院包头研究院 | Fault detection method for SCR system catalytic box |
| US20160108791A1 (en) * | 2014-10-16 | 2016-04-21 | Caterpillar Inc. | Aftertreatment Control for Detection of Fuel Contaminant Concentration |
| CN104492211A (en) * | 2014-11-21 | 2015-04-08 | 大连海事大学 | Novel ship exhaust gas multi-pollutant combined removing method and apparatus thereof |
| US20170167352A1 (en) * | 2015-12-14 | 2017-06-15 | Toyota Jidosha Kabushiki Kaisha | Deterioration diagnosis apparatus for selective catalytic reduction catalyst |
| CN106121797A (en) * | 2016-08-29 | 2016-11-16 | 无锡威孚力达催化净化器有限责任公司 | SCR aftertreatment system NH_3 leakage state judging method |
| CN106437956A (en) * | 2016-09-23 | 2017-02-22 | 上海海事大学 | Fuzzy control method for series selective catalytic reduction system |
| CN106703957A (en) * | 2016-11-29 | 2017-05-24 | 潍柴动力空气净化科技有限公司 | SCR (Selective Catalytic Reduction) catalyst transient characteristic evaluation method and test device for SCR catalyst transient characteristic evaluation |
| DE102017201393A1 (en) * | 2017-01-30 | 2018-08-02 | Robert Bosch Gmbh | Method for fault detection in an SCR system by means of ammonia slip |
| JP2018145869A (en) * | 2017-03-06 | 2018-09-20 | いすゞ自動車株式会社 | Exhaust emission control system and sulfur poisoning restriction method for exhaust emission control system |
| US20190162094A1 (en) * | 2017-11-30 | 2019-05-30 | GM Global Technology Operations LLC | Control reset and diagnostic to maintain tailpipe compliance |
| CN110284951A (en) * | 2018-03-19 | 2019-09-27 | 通用汽车环球科技运作有限责任公司 | Selective catalytic reduction fault detection |
| CN109763883A (en) * | 2019-02-11 | 2019-05-17 | 无锡威孚力达催化净化器有限责任公司 | A kind of detection method of SCR system ammonia leakage, apparatus and system |
| CN110645076A (en) * | 2019-09-23 | 2020-01-03 | 华东交通大学 | NH based on model3Leak diagnosis method |
| CN110966072A (en) * | 2019-12-24 | 2020-04-07 | 潍柴动力股份有限公司 | Urea concentration fault detection method and device, control equipment and storage medium |
| CN110761882A (en) * | 2019-12-26 | 2020-02-07 | 潍柴动力股份有限公司 | Method and system for judging SCR sulfur poisoning |
| EP3842624A1 (en) * | 2019-12-26 | 2021-06-30 | Weichai Power Co., Ltd. | Method and system for determining sulfur poisoning state of selectively catalytic reduction device |
| CN112594044A (en) * | 2020-12-14 | 2021-04-02 | 潍柴动力股份有限公司 | Aging prediction method and device for post-processing system |
| CN113719338A (en) * | 2021-09-27 | 2021-11-30 | 潍柴动力股份有限公司 | SCR sulfur poisoning degree determining method and device, diesel vehicle and medium |
| CN113790094A (en) * | 2021-09-29 | 2021-12-14 | 潍柴动力股份有限公司 | Method, device, vehicle and medium for determining sulfur poisoning of aftertreatment system |
| CN114323692A (en) * | 2021-12-29 | 2022-04-12 | 无锡伟博汽车科技有限公司 | SCR (selective catalytic reduction) low-efficiency fault diagnosis method |
| CN114370319A (en) * | 2022-01-19 | 2022-04-19 | 潍柴动力股份有限公司 | Closed-loop control method and control system of SCR post-treatment system |
Non-Patent Citations (2)
| Title |
|---|
| 杨建军;栗国;马杰;刘双喜;高海洋;: "钒基SCR后处理技术在柴油机上的应用进展", 科技导报, no. 34, pages 73 - 79 * |
| 邢居真;高俊华;钟绍华;: "选择性催化还原(SCR)技术降低柴油机NO_X排放研究", 北京汽车, no. 03, pages 14 - 36 * |
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