CN115095412A - Method, device, equipment and medium for monitoring SCR (selective catalytic reduction) system of diesel vehicle tail gas - Google Patents
Method, device, equipment and medium for monitoring SCR (selective catalytic reduction) system of diesel vehicle tail gas Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The application discloses diesel vehicle tail gas's SCR system monitoring method, device, equipment, medium relates to diesel vehicle tail gas processing technology field, includes: when the SCR conversion efficiency of the SCR system is lower than a first efficiency value set by passive monitoring and the exhaust temperature parameter and the engine running time parameter at the upstream of the SCR system meet a preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring a storage value of residual ammonia in an SCR catalyst; comparing the stored value of the residual ammonia gas with the stored value of the standard ammonia gas, and stopping the operation of injecting the urea with multiple times if the stored value of the residual ammonia gas is smaller than the stored value of the standard ammonia gas; and calculating the current SCR conversion efficiency based on the stored value of the residual ammonia gas, acquiring a corresponding calculation result, and judging the state of the SCR system by using the calculation result to realize the monitoring of the SCR system. By further monitoring the SCR system under passive monitoring, the problem of low SCR conversion efficiency caused by misjudgment due to ammonia gas leakage is avoided, and the performance of the SCR system is accurately judged.
Description
Technical Field
The invention relates to the technical field of diesel vehicle tail gas treatment, in particular to a diesel vehicle tail gas SCR system monitoring method, device, equipment and medium.
Background
The pollution of heavy duty diesel engines comes mainly from three aspects: particulate matter, Hydrocarbons (HC) X ) Nitrogen Oxide (NO) X ) And sulfur. The nitrogen oxide is nitrogen dioxide (NO) formed by chemical reaction under the condition of nonuniform mixing of fuel oil and air and the like in the combustion process in an engine cylinder of the heavy diesel vehicle 2 ) And Nitric Oxide (NO). Nitrogen oxides, based on nitric oxide and nitrogen dioxide, are a significant cause of photochemical smog and acid rain. At present, most manufacturers adopt an SCR technical route to treat nitrogen oxides. According to the nitrogen and oxygen value acquired by the SCR upstream nitrogen and oxygen sensor, the urea solution required to react is calculated, and the ammonia gas decomposed by the urea is used as a reducing agent to convert the toxic nitrogen oxides in the tail gas into nontoxic nitrogen and water through a selective catalytic reduction reaction in the SCR catalyst. When the performance of the SCR catalyst is reduced or sulfur poisoning occurs, the efficiency of the SCR system for converting NOx is reduced, the NOx value in tail gas exceeds the standard, the environmental protection is affected, and the regulation requirement is not met.
At present, the SCR technology taking urea as a reducing agent has the advantages of improving fuel consumption and stronger sulfur poisoning resistance by optimizing in-cylinder combustion, is widely applied as an important means for controlling the exhaust emission of heavy diesel engines, and plays an important role in improving the atmospheric pollution caused by the exhaust gas of diesel automobiles. NO in exhaust gases from engine combustion chambers X And the urea is mixed with ammonia generated by decomposition of urea injected into an exhaust pipe, and the reaction is accelerated to harmless ammonia and water under the action of a catalyst. Selective catalytic reduction technology allows NO to be converted without reducing engine efficiency X The conversion rate is greatly improved, and the fuel economy is better. Methods of monitoring SCR efficiency in the prior art: tong (Chinese character of 'tong')Over-integral calculation of catalyst upstream NO X And downstream NO X Total value, SCR efficiency 1-downstream NO calculated by formula X /upstream NO X And comparing the model efficiency with a model efficiency or a limit value, wherein the SCR conversion efficiency is reduced if the model efficiency or the limit value is lower than the limit value. The method is a passive monitoring method for SCR efficiency. In the prior art, the monitoring of SCR efficiency is easily influenced by ammonia leakage, and NO collected by a downstream nitrogen-oxygen sensor when urea is sprayed too much X Values of ammonia and NO X The calculated SCR efficiency may be lower than the limit value, and at this time, it may be erroneously determined that the SCR conversion efficiency is decreased. Since prior art monitoring of SCR efficiency is too simple, complete and accurate methods of control and monitoring are required for the most important components of an SCR system in an emission system.
In summary, how to accurately monitor and control an SCR system in an exhaust emission system of a diesel vehicle is a technical problem to be solved in the art.
Disclosure of Invention
In view of the above, the present invention provides a method, an apparatus, a device, and a medium for monitoring an SCR system of an exhaust gas of a diesel vehicle, which can accurately monitor and control the SCR system in an exhaust gas emission system of the diesel vehicle. The specific scheme is as follows:
in a first aspect, the application discloses a method for monitoring an SCR system for exhaust gas of a diesel vehicle, comprising:
when the SCR conversion efficiency of the SCR system is lower than a first efficiency value set by passive monitoring and the exhaust temperature parameter and the engine running time parameter at the upstream of the SCR system meet a preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring a storage value of residual ammonia in an SCR catalyst;
comparing the stored value of the residual ammonia with a stored value of standard ammonia, and stopping the operation of injecting urea in multiple times if the stored value of the residual ammonia is smaller than the stored value of the standard ammonia;
and calculating the current SCR conversion efficiency based on the stored value of the residual ammonia gas, acquiring a corresponding calculation result, and judging the state of the SCR system by using the calculation result to realize the monitoring of the SCR system.
Optionally, the method for monitoring the SCR system of the diesel vehicle exhaust further includes:
and when the SCR conversion efficiency of the SCR system is higher than the first efficiency value set by passive monitoring, judging that the performance of converting the tail gas of the SCR system is normal.
Optionally, before the operation of starting to inject multiple times of urea, the method further includes:
SCR system parameters including the exhaust temperature parameter and the engine run time parameter upstream of the SCR system are pre-obtained.
Optionally, after comparing the stored value of residual ammonia gas with the stored value of standard ammonia gas, the method further includes:
and if the residual ammonia gas storage value is larger than the standard ammonia gas storage value, judging that the performance of the SCR system for converting the tail gas is a normal condition.
Optionally, the determining the state of the SCR system by using the calculation result to monitor the SCR system includes:
and if the calculation result is smaller than a second efficiency value, judging that the performance of the converted tail gas of the SCR system is an abnormal condition, and alarming to prompt a user.
Optionally, the determining that the performance of the converted exhaust gas of the SCR system is abnormal, and giving an alarm to prompt a user includes:
and when the performance of the converted tail gas of the SCR system is judged to be abnormal, an alarm is given to prompt a user and a torque limit instruction is sent to an electronic control unit.
Optionally, the determining the state of the SCR system by using the calculation result to monitor the SCR system includes:
and if the calculation result is larger than a second efficiency value, judging that the performance of the converted tail gas of the SCR system is a normal condition.
In a second aspect, the present application discloses a diesel vehicle exhaust's SCR system monitoring devices includes:
the operation execution module is used for starting the operation of spraying multiple times of urea and acquiring a stored value of residual ammonia in an SCR catalyst when the SCR conversion efficiency of the SCR system is lower than a first efficiency value set by passive monitoring and the exhaust temperature parameter and the engine running time parameter at the upstream of the SCR system meet a preset parameter threshold condition;
an operation ending module, configured to compare the stored value of residual ammonia with a stored value of standard ammonia, and stop the operation of injecting multiple urea if the stored value of residual ammonia is smaller than the stored value of standard ammonia;
and the system monitoring module is used for calculating the current SCR conversion efficiency based on the stored value of the residual ammonia gas, acquiring a corresponding calculation result, and judging the state of the SCR system by using the calculation result to realize the monitoring of the SCR system.
In a third aspect, the present application discloses an electronic device, comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the method for monitoring an SCR system for diesel exhaust disclosed in the foregoing.
In a fourth aspect, the present application discloses a computer readable storage medium for storing a computer program; wherein the computer program is adapted to, when being executed by a processor, carry out the steps of the method for monitoring an SCR system for exhaust gases of a diesel vehicle as disclosed in the foregoing.
Therefore, the application discloses a diesel vehicle exhaust SCR system monitoring method, which comprises the following steps: when the SCR conversion efficiency of the SCR system is lower than a first efficiency value set by passive monitoring and the exhaust temperature parameter and the engine running time parameter at the upstream of the SCR system meet a preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring a storage value of residual ammonia in an SCR catalyst; comparing the stored value of residual ammonia with a stored value of standard ammonia, and stopping the operation of injecting urea in multiple times if the stored value of residual ammonia is smaller than the stored value of standard ammonia; and calculating the current SCR conversion efficiency based on the stored value of the residual ammonia gas, acquiring a corresponding calculation result, and judging the state of the SCR system by using the calculation result to realize the monitoring of the SCR system. Therefore, the SCR system under passive monitoring is further monitored, the problem that the SCR conversion efficiency is low due to misjudgment caused by ammonia gas leakage is avoided, the performance of the SCR system is accurately judged, the occurrence of misreporting is reduced, and the calculated SCR conversion efficiency is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for monitoring an SCR system for diesel exhaust as disclosed herein;
FIG. 2 is a functional schematic diagram of an autonomous monitoring disclosed herein;
FIG. 3 is a graph of average efficiency of a passively monitored SCR as disclosed herein;
FIG. 4 is a graph of average efficiency of an actively monitored SCR as disclosed herein;
FIG. 5 is a flow chart of a specific method for monitoring a diesel vehicle exhaust SCR system as disclosed herein;
FIG. 6 is a graph illustrating the average SCR efficiency calculated during a non-urea injection phase as disclosed herein;
FIG. 7 is a graph illustrating the calculation of your average efficiency of SCR during the emptying phase disclosed in this application;
FIG. 8 is a flow chart of a method for anti-cheating an SCR system as disclosed herein;
FIG. 9 is a schematic structural diagram of an SCR system monitoring device for diesel exhaust according to the present disclosure;
fig. 10 is a block diagram of an electronic device disclosed in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
At present, the SCR technology taking urea as a reducing agent has the advantages of improving fuel consumption and stronger sulfur poisoning resistance by optimizing in-cylinder combustion, is widely applied as an important means for controlling the exhaust emission of heavy diesel engines, and plays an important role in improving the atmospheric pollution caused by the exhaust gas of diesel automobiles. NO in exhaust gases from engine combustion chambers X And the urea is mixed with ammonia generated by decomposition of urea injected into an exhaust pipe, and the reaction is accelerated to harmless ammonia and water under the action of a catalyst. Selective catalytic reduction technology allows NO to be converted without reducing engine efficiency X The conversion rate is greatly improved, and the fuel economy is better. Methods of monitoring SCR efficiency in the prior art: calculating catalyst upstream NO by integration X And downstream NO X Total value, SCR efficiency calculated by formula 1-downstream NOx/upstream NO X And comparing the model efficiency with a model efficiency or a limit value, wherein the SCR conversion efficiency is reduced if the model efficiency or the limit value is lower than the limit value. The method is a passive monitoring method for SCR efficiency. The prior art monitors the SCR efficiency and is easily influenced by ammonia leakage, and NO collected by a downstream nitrogen-oxygen sensor is excessive in urea injection X Values of ammonia and NO X The calculated SCR efficiency may be lower than the limit value, and at this time, it may be erroneously determined that the SCR conversion efficiency is decreased. Since prior art monitoring of SCR efficiency is too simple, complete and accurate methods of control and monitoring are required for the most important components of an SCR system in an emission system.
Therefore, the application provides a monitoring scheme of the SCR system of the tail gas of the diesel vehicle, which can realize accurate monitoring and control of the SCR system in the tail gas emission system of the diesel vehicle.
Referring to fig. 1, an embodiment of the invention discloses a method for monitoring an SCR system of diesel vehicle exhaust, which includes:
step S11: when the SCR conversion efficiency of the SCR system is lower than a first efficiency value set by passive monitoring and the exhaust temperature parameter and the engine running time parameter at the upstream of the SCR system meet a preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring a storage value of residual ammonia in an SCR catalyst.
In this embodiment, the scr (selective Catalytic reduction) selective Catalytic reduction system is mainly a diesel engine exhaust gas aftertreatment system for treating nitrogen oxides in engine exhaust gas, and mainly uses ammonia gas decomposed by urea as a reducing agent to convert toxic nitrogen oxides in exhaust gas into nontoxic nitrogen gas and water through a selective Catalytic reduction reaction. The efficiency of the existing passive monitoring SCR is easily influenced by ammonia leakage, so that the SCR efficiency for realizing monitoring is more accurate, and when the passive monitoring condition is met, the integration calculates the NO of the upstream and downstream nitrogen-oxygen sensors X And accumulating the values, and calculating the average efficiency of passive monitoring, wherein the calculation formula of the average efficiency of passive monitoring is as follows: passive average efficiency of 1-downstream NO X Cumulative/upstream NO X Cumulative value of NO X Containing NO 2 Nitrogen oxides such as (nitrogen dioxide) and NO (nitric oxide). Comparing the average efficiency of passive monitoring with the model efficiency or the limit value, referring to fig. 2, which is a functional schematic diagram of autonomous monitoring, it can be seen that the average efficiency of SCR conversion in a normal state is far higher than the average efficiency of SCR conversion in a failure state, and the maximum ammonia storage amount of SCR in the normal state is larger than the maximum ammonia storage amount of SCR in the failure state, and after active monitoring is activated, urea is controlled to be injected by 3 times, so that the ammonia storage of the SCR catalyst is quickly maximized. Stopping injecting urea after SCR reaches maximum ammonia storage, and completely storing ammonia gas and NO in tail gas X Reacting, if normal SCR, sufficient ammonia is stored with NO X The reduction capability and the conversion efficiency are high during reaction; if the SCR is failed, little ammonia is stored, with NO X The catalytic reduction capability of (a) is drastically reduced and the calculated average conversion efficiency is very low. In the stage of non-injection of urea, the average conversion efficiency of the normal SCR and the invalid SCR has high discrimination as a method for judging the reduction of the SCR efficiency. The influence of ammonia leakage on SCR efficiency can be well avoided by autonomously monitoring the calculation efficiency in the emptying stage, and the calculated average efficiencyAccurately, as shown in fig. 3, the result of testing the passive monitoring average efficiency of the SCR is performed for the normal SCR system operating WHTC cycle, that is, the continuous test point of the normalized rotation speed and the torque of the SCR system which change rapidly with time, as shown in fig. 4, the result of testing the passive monitoring average efficiency of the SCR is performed for the failed SCR system operating WHTC cycle.
In this embodiment, when the SCR conversion efficiency of the SCR system is higher than the first efficiency value set by the passive monitoring, it is determined that the performance of the SCR system for converting the exhaust gas is normal. It will be appreciated that NO when captured by passive monitoring to the corresponding upstream and downstream NOx sensors X After data information such as values and the like is accumulated, the average conversion efficiency of passive monitoring is calculated through integral operation and compared with the efficiency or the limit value of the model, if the comparison result is higher than the efficiency or the limit value of the model, namely higher than the first efficiency value set by passive monitoring, the performance of the SCR system for converting the tail gas is normal, and the operation of autonomous monitoring or active monitoring is not required to be started.
In this embodiment, before the operation of starting the injection of multiple times of urea, the method further includes: SCR system parameters including the exhaust temperature parameter and the engine run time parameter upstream of the SCR system are pre-obtained. It can be understood that engine speed, torque, exhaust flow, NOx sensor NO are obtained X The method comprises the steps of calculating parameters such as an upstream SCR exhaust temperature sensor value and the like, calculating the SCR average efficiency under passive monitoring by using the data and other information, monitoring the SCR upstream exhaust temperature and the engine running time, and controlling urea to carry out multiple injection operation by monitoring the temperature range of the SCR upstream exhaust temperature value and the interval when the running time of a transmitter reaches a preset range, so as to enter a urea multiple injection stage. For example: when the condition that the exhaust temperature value of the SCR is in the range of 240-340 and the running time of the engine exceeds 500s, the method enters a urea multi-time injection stage, namely an over-injection stage, wherein the over-injection stage is to inject urea into an SCR catalyst by 3 times of basic injection quantity and NO X The ammonia remaining after the reaction can be stored in the SCR catalyst relatively quickly. When the storage of ammonia in the SCR catalyst is maximized, unreacted and non-storable ammonia gas is discharged to the end of the exhaust pipe.
Step S12: and comparing the stored value of the residual ammonia gas with a stored value of standard ammonia gas, and stopping the operation of injecting urea by multiple times if the stored value of the residual ammonia gas is smaller than the stored value of the standard ammonia gas.
In this embodiment, the stored value of ammonia, that is, the stored value of remaining ammonia, is calculated according to the calculation formula: calculating a residual ammonia storage value which is the total injection quantity of the urea and the reacted urea quantity, then comparing the residual ammonia storage value with a standard ammonia storage value, and stopping the operation of injecting the urea with multiple times if the residual ammonia storage value is smaller than the standard ammonia storage value X Reacting, if normal SCR, the stored ammonia is sufficient to react with NO X The reduction capacity and the conversion efficiency are high during the reaction, so that the operation of injecting urea by multiple times is stopped, the urea non-injection stage is started, if the SCR is a failed SCR, the stored ammonia is little, the catalytic reduction capacity of NOx is reduced sharply, and the calculated average conversion efficiency is low.
In this embodiment, after comparing the stored value of residual ammonia gas with the stored value of standard ammonia gas, the method further includes: and if the residual ammonia gas storage value is larger than the standard ammonia gas storage value, judging that the performance of the SCR system for converting the tail gas is a normal condition. If the storage value of the residual ammonia is larger than the storage value of the standard ammonia gas, the SCR can be immediately judged to be normal.
Step S13: and calculating the current SCR conversion efficiency based on the stored value of the residual ammonia gas, acquiring a corresponding calculation result, and judging the state of the SCR system by using the calculation result to realize the monitoring of the SCR system.
In this embodiment, the current SCR conversion efficiency is calculated based on the stored value of the remaining ammonia gas, and a corresponding calculation result is obtained, it can be understood that a corresponding calculation result is obtained by calculating the SCR efficiency when urea is not injected into a node, the state of the SCR system is judged by using the calculation result, monitoring of the SCR system is realized, the state of the SCR system is judged again based on the calculation result, a conclusion that the current SCR system is in an accurate state, such as a normal state or an abnormal state, is obtained, and an accurate judgment is performed on the state of the SCR system by combining passive monitoring and active monitoring, so that state monitoring of the SCR system is realized.
Therefore, the application discloses a diesel vehicle exhaust SCR system monitoring method, which comprises the following steps: when the SCR conversion efficiency of the SCR system is lower than a first efficiency value set by passive monitoring and the exhaust temperature parameter and the engine running time parameter at the upstream of the SCR system meet a preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring a storage value of residual ammonia in an SCR catalyst; comparing the stored value of residual ammonia with a stored value of standard ammonia, and stopping the operation of injecting urea in multiple times if the stored value of residual ammonia is smaller than the stored value of standard ammonia; and calculating the current SCR conversion efficiency based on the stored value of the residual ammonia gas, acquiring a corresponding calculation result, and judging the state of the SCR system by using the calculation result to realize the monitoring of the SCR system. Therefore, the SCR system under passive monitoring is further monitored, the problem that the SCR conversion efficiency is low due to misjudgment caused by ammonia gas leakage is avoided, the performance of the SCR system is accurately judged, the occurrence of misreporting is reduced, and the calculated SCR conversion efficiency is more accurate.
Referring to fig. 5, the embodiment of the invention discloses a specific method for monitoring an SCR system of diesel vehicle exhaust, and compared with the previous embodiment, the embodiment further describes and optimizes the technical scheme. Specifically, the method comprises the following steps:
step S21: when the SCR conversion efficiency of the SCR system is lower than a first efficiency value set by passive monitoring and the exhaust temperature parameter and the engine running time parameter at the upstream of the SCR system meet a preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring a storage value of residual ammonia in an SCR catalyst.
Step S22: and comparing the stored value of the residual ammonia gas with a stored value of standard ammonia gas, and stopping the operation of injecting the urea by multiple times if the stored value of the residual ammonia gas is smaller than the stored value of the standard ammonia gas.
For a more detailed processing procedure in steps S21, S22, and S23, reference is made to the embodiments disclosed above, and details are not repeated herein.
Step S23: and calculating the current SCR conversion efficiency based on the stored value of the residual ammonia gas, and acquiring a corresponding calculation result.
In this embodiment, referring to fig. 6, when the calculated stored value of the remaining ammonia gas is lower than the standard ammonia storage limit value, the urea non-injection phase is entered, the average SCR conversion efficiency at this phase is calculated, and the comparison magnitude relation between the current average SCR conversion efficiency and the efficiency or limit value of the model during passive monitoring can be obtained.
Step S24: and if the calculation result is smaller than a second efficiency value, judging that the performance of the converted tail gas of the SCR system is an abnormal condition, and alarming to prompt a user.
In this embodiment, the second efficiency value is also the efficiency or the limit value of the model during passive monitoring, so that when the calculation result is that the current average conversion efficiency of the SCR is lower than the limit value, it is diagnosed that the conversion efficiency of the SCR is reduced, fault information generated by active monitoring is reported, a fault affecting the emission performance of the engine is diagnosed by an OBD (on-board diagnostics) system, that is, a computer system installed on an automobile and an engine, belonging to a pollution control device, and displayed by an alarm system when the fault occurs, a possible fault area is determined by information stored in a memory of an electronic control unit, and information off-line communication is provided. Referring to fig. 7, when the average efficiency calculated at the urea non-injection stage is smaller than the average efficiency limit value, it is determined that the conversion efficiency of the SCR system is reduced, an alarm message is activated, a limit torque command is sent to the ECU, and when it is determined that the performance of the converted exhaust gas of the SCR system is abnormal, an alarm is given to prompt a user and send a torque limit command to the electronic control unit, and the alarm message and the limit torque command are sent to the ECU, which is an electronic control unit, also called a traveling computer or a vehicle-mounted computer, and is a vehicle-specific microcomputer controller, which is composed of a microprocessor, a memory, an input/output interface, an analog-to-digital converter, a drive and other large-scale integrated circuits, and is used for correspondingly controlling the vehicle after receiving the torque limit command for the vehicle.
Step S25: and if the calculation result is larger than a second efficiency value, judging that the performance of the converted tail gas of the SCR system is a normal condition.
In this embodiment, if the calculation result is greater than the second efficiency value and does not match the result that the average efficiency detected in the passive monitoring is smaller than the limit value, the performance of the current SCR system for converting exhaust gas is determined to be a normal condition according to the current technical result, which is more perfect than the passive monitoring logic, so that a false alarm condition is not generated, a reaction can be made in the case of cheating, the torque output of the engine is limited, and the situation of excessive emission is prevented. Referring to FIG. 8, an engine is normally started to obtain engine speed, torque, exhaust gas flow, and NOx sensor NO X The method comprises the steps that parameters such as an upstream SCR exhaust temperature sensor value and the like are measured, then a normal SCR system runs a WHTC (engine emission test) cycle to test an SCR passive monitoring average efficiency result, if the passive monitoring SCR average efficiency is higher than a limit value, the operation efficiency of the current SCR system is normal, at the moment, the SCR system is judged to be normal, the problem of reduction of conversion efficiency does not occur, and alarm information cannot be sent; if the average efficiency of the passive monitoring SCR is lower than the limit value, judging that the current SCR system is a failure SCR system, operating a WHTC cycle, performing active monitoring, monitoring the exhaust temperature at the upstream of the SCR and the operation time of an engine, so as to judge whether to enter a urea multiple injection stage, calculating the value of stored ammonia at the moment, if the stored value of ammonia at the moment is greater than the limit value, indicating that a judgment error occurs during passive monitoring, misjudging that the conversion efficiency of the SCR system at the moment is low, if the stored value of ammonia at the moment is less than the limit value, entering a next urea non-injection stage, calculating the SCR efficiency at the moment, comparing the SCR efficiency at the moment with the limit value, if the SCR efficiency at the moment is less than the limit value, judging that the current SCR system is the failure system, sending corresponding alarm information and a torque limiting instruction to an ECU, limiting the torque output of the engine, and preventing the emission overproof from occurring; and if the ammonia storage value is larger than the limit value, judging that the current SCR system has no fault and the SCR conversion efficiency is normal.
Therefore, the SCR conversion efficiency is judged through ammonia storage, the problem that the SCR conversion efficiency is reduced due to misjudgment caused by ammonia leakage can be solved, the SCR catalytic reduction capacity is calculated for many times, and the performance of an SCR system can be accurately judged. In the stage of non-injection of urea, the average conversion efficiency of the normal SCR and the invalid SCR has high discrimination as a method for judging the reduction of the SCR efficiency. The calculation efficiency in the emptying stage can be well monitored autonomously, the influence of ammonia leakage on the SCR efficiency can be avoided, the calculated average efficiency is accurate, and whether the SCR system is normal or not can be accurately judged.
Referring to fig. 9, an embodiment of the present invention discloses a specific diesel vehicle exhaust SCR system monitoring device, including:
the operation execution module 11 is used for starting the operation of injecting multiple times of urea and acquiring a stored value of residual ammonia in an SCR catalyst when the SCR conversion efficiency of the SCR system is lower than a first efficiency value set by passive monitoring and the exhaust temperature parameter and the engine running time parameter at the upstream of the SCR system meet a preset parameter threshold condition;
an operation ending module 12, configured to compare the stored value of residual ammonia with a stored value of standard ammonia, and stop the operation of injecting multiple urea if the stored value of residual ammonia is smaller than the stored value of standard ammonia;
and the system monitoring module 13 is configured to calculate the current SCR conversion efficiency based on the stored value of the remaining ammonia gas, obtain a corresponding calculation result, and judge the state of the SCR system by using the calculation result, so as to monitor the SCR system.
Therefore, the application discloses a diesel vehicle exhaust SCR system monitoring method, which comprises the following steps: when the SCR conversion efficiency of the SCR system is lower than a first efficiency value set by passive monitoring and the exhaust temperature parameter and the engine running time parameter at the upstream of the SCR system meet a preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring a storage value of residual ammonia in an SCR catalyst; comparing the stored value of residual ammonia with a stored value of standard ammonia, and stopping the operation of injecting urea in multiple times if the stored value of residual ammonia is smaller than the stored value of standard ammonia; and calculating the current SCR conversion efficiency based on the stored value of the residual ammonia gas, acquiring a corresponding calculation result, and judging the state of the SCR system by using the calculation result to realize the monitoring of the SCR system. Therefore, the SCR system under passive monitoring is further monitored, the problem that the SCR conversion efficiency is low due to misjudgment caused by ammonia gas leakage is avoided, the performance of the SCR system is accurately judged, the occurrence of misreporting is reduced, and the calculated SCR conversion efficiency is more accurate.
Further, an electronic device is disclosed in the embodiments of the present application, and fig. 10 is a block diagram of an electronic device 20 according to an exemplary embodiment, which should not be construed as limiting the scope of the application.
Fig. 10 is a schematic structural diagram of an electronic device 20 according to an embodiment of the present disclosure. The electronic device 20 may specifically include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input output interface 25, and a communication bus 26. Wherein, the memory 22 is used for storing a computer program, and the computer program is loaded and executed by the processor 21 to implement the relevant steps in the method for monitoring the SCR system of diesel vehicle exhaust disclosed in any one of the foregoing embodiments. In addition, the electronic device 20 in the present embodiment may be specifically an electronic computer.
In this embodiment, the power supply 23 is configured to provide a working voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and an external device, and a communication protocol followed by the communication interface is any communication protocol applicable to the technical solution of the present application, and is not specifically limited herein; the input/output interface 25 is configured to obtain external input data or output data to the outside, and a specific interface type thereof may be selected according to specific application requirements, which is not specifically limited herein.
The processor 21 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and the like. The processor 21 may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), PLA (Programmable Logic Array). The processor 21 may also include a main processor and a coprocessor, where the main processor is a processor for Processing data in a wake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 21 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content required to be displayed on the display screen. In some embodiments, the processor 21 may further include an AI (Artificial Intelligence) processor for processing a calculation operation related to machine learning.
In addition, the storage 22 is used as a carrier for storing resources, and may be a read-only memory, a random access memory, a magnetic disk or an optical disk, etc., and the resources stored thereon may include an operating system 221, a computer program 222, etc., and the storage manner may be a transient storage manner or a permanent storage manner.
The operating system 221 is used for managing and controlling each hardware device and the computer program 222 on the electronic device 20, so as to realize the operation and processing of the mass data 223 in the memory 22 by the processor 21, and may be Windows Server, Netware, Unix, Linux, and the like. The computer program 222 may further include a computer program that can be used to perform other specific tasks in addition to the computer program that can be used to perform the method for monitoring the SCR system of diesel exhaust performed by the electronic device 20 disclosed in any of the foregoing embodiments. The data 223 may include data received by the electronic device and transmitted from an external device, or may include data collected by the input/output interface 25 itself.
Further, the present application also discloses a computer-readable storage medium for storing a computer program; wherein the computer program is executed by a processor to implement the aforementioned disclosed method for monitoring an SCR system for diesel exhaust. For the specific steps of the method, reference may be made to the corresponding contents disclosed in the foregoing embodiments, which are not described herein again.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application. The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The method, the device, the equipment and the medium for monitoring the SCR system of the diesel vehicle exhaust provided by the invention are introduced in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method for monitoring an SCR system of diesel vehicle exhaust is characterized by comprising the following steps:
when the SCR conversion efficiency of the SCR system is lower than a first efficiency value set by passive monitoring and the exhaust temperature parameter and the engine running time parameter at the upstream of the SCR system meet a preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring a storage value of residual ammonia in an SCR catalyst;
comparing the stored value of residual ammonia with a stored value of standard ammonia, and stopping the operation of injecting urea in multiple times if the stored value of residual ammonia is smaller than the stored value of standard ammonia;
and calculating the current SCR conversion efficiency based on the stored value of the residual ammonia gas, acquiring a corresponding calculation result, and judging the state of the SCR system by using the calculation result to realize the monitoring of the SCR system.
2. The diesel vehicle exhaust SCR system monitoring method of claim 1, further comprising:
and when the SCR conversion efficiency of the SCR system is higher than the first efficiency value set by passive monitoring, judging that the performance of converting the tail gas of the SCR system is normal.
3. The method for monitoring an SCR system for diesel exhaust as recited in claim 1, further comprising, before the operation of initiating injection of multiple urea:
SCR system parameters including the exhaust temperature parameter and the engine run time parameter upstream of the SCR system are pre-obtained.
4. The method of monitoring an SCR system for diesel vehicle exhaust as claimed in claim 1 further comprising, after said comparing said stored value for residual ammonia to a stored value for standard ammonia:
and if the residual ammonia gas storage value is larger than the standard ammonia gas storage value, judging that the performance of the SCR system for converting the tail gas is a normal condition.
5. The method for monitoring the SCR system of diesel vehicle exhaust according to claim 1, wherein the determining the state of the SCR system using the calculation result to monitor the SCR system comprises:
and if the calculation result is smaller than a second efficiency value, judging that the performance of the converted tail gas of the SCR system is an abnormal condition, and alarming to prompt a user.
6. The method for monitoring the SCR system of diesel vehicle exhaust according to claim 5, wherein said determining the performance of the SCR system to convert exhaust to abnormal conditions and alerting the user comprises:
and when the performance of the converted tail gas of the SCR system is judged to be abnormal, an alarm is given to prompt a user and a torque limit instruction is sent to an electronic control unit.
7. The method for monitoring the SCR system of diesel vehicle exhaust according to claim 1, wherein the determining the state of the SCR system using the calculation result to monitor the SCR system comprises:
and if the calculation result is larger than a second efficiency value, judging that the performance of the converted tail gas of the SCR system is a normal condition.
8. The utility model provides a diesel vehicle exhaust's SCR system monitoring devices which characterized in that includes:
the operation execution module is used for starting the operation of injecting multiple times of urea and acquiring a storage value of residual ammonia in the SCR catalyst when the SCR conversion efficiency of the SCR system is lower than a first efficiency value set by passive monitoring and the exhaust temperature parameter and the engine running time parameter at the upstream of the SCR system meet the preset parameter threshold condition;
an operation ending module, configured to compare the stored value of residual ammonia with a stored value of standard ammonia, and stop the operation of injecting multiple urea if the stored value of residual ammonia is smaller than the stored value of standard ammonia;
and the system monitoring module is used for calculating the current SCR conversion efficiency based on the stored value of the residual ammonia gas, acquiring a corresponding calculation result, and judging the state of the SCR system by using the calculation result to realize the monitoring of the SCR system.
9. An electronic device, comprising:
a memory for storing a computer program;
a processor for executing said computer program for carrying out the steps of a method for the SCR system monitoring of exhaust gases of diesel vehicles as claimed in any one of claims 1 to 7.
10. A computer-readable storage medium for storing a computer program; wherein the computer program realizes the steps of a method for monitoring an SCR system for exhaust gases of a diesel vehicle as claimed in any one of claims 1 to 7 when executed by a processor.
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