CN115095412B - Monitoring method, device, equipment and medium for SCR system of diesel vehicle tail gas - Google Patents
Monitoring method, device, equipment and medium for SCR system of diesel vehicle tail gas Download PDFInfo
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- CN115095412B CN115095412B CN202210872047.1A CN202210872047A CN115095412B CN 115095412 B CN115095412 B CN 115095412B CN 202210872047 A CN202210872047 A CN 202210872047A CN 115095412 B CN115095412 B CN 115095412B
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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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- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application discloses a monitoring method, a device, equipment and a medium of an SCR system of diesel vehicle tail gas, which relate to the technical field of diesel vehicle tail gas treatment and comprise 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 the preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring the residual ammonia storage value in the SCR catalyst; comparing the residual ammonia gas storage value with the standard ammonia gas storage value, and stopping the operation of injecting the multiple urea if the residual ammonia gas storage value is smaller than the standard ammonia gas storage value; and calculating the current SCR conversion efficiency based on the residual ammonia storage value, 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. The SCR system under the passive monitoring is further monitored, so that the problem of low SCR conversion efficiency due to misjudgment caused by ammonia leakage is avoided, and the performance of the SCR system is accurately judged.
Description
Technical Field
The application relates to the technical field of diesel vehicle tail gas treatment, in particular to a monitoring method, a device, equipment and a medium of an SCR system of diesel vehicle tail gas.
Background
Pollution from heavy duty diesel engines comes mainly from three aspects: particulate emissions, hydrocarbons (HC) X ) Nitrogen Oxides (NO) X ) And sulfur. The nitrogen oxide is the formed dioxide which is generated by chemical reaction under the condition of uneven fuel and air mixing in the combustion process in the engine cylinder of the heavy diesel vehicleNitrogen (NO) 2 ) And Nitric Oxide (NO). Nitrogen oxides, mainly nitric oxide and nitrogen dioxide, are an important cause of formation of photochemical smog and acid rain. Most manufacturers currently adopt an SCR technology route to treat nitrogen oxides. According to the nitrogen and oxygen value collected by the SCR upstream nitrogen and oxygen sensor, calculating a urea solution to be reacted, and converting toxic nitrogen oxides in tail gas into nontoxic nitrogen and water by selective catalytic reduction reaction in the SCR catalyst by using ammonia decomposed by urea as a reducing agent. When the performance of the SCR catalyst is reduced or sulfur poisoning is caused, the efficiency of converting NOx of the SCR system 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 using urea as a reducing agent has been widely used as an important means for controlling the exhaust emission of a heavy diesel engine due to the advantages of improving fuel consumption, stronger sulfur poisoning resistance and the like by optimizing in-cylinder combustion, and plays an important role in improving the atmospheric pollution caused by the exhaust of the diesel automobile. Exhaust of NO from engine combustion chamber X The ammonia is mixed with urea which is injected into an exhaust pipe to decompose to generate ammonia, and the ammonia and the water react with acceleration to be harmless under the action of a catalyst. Selective catalytic reduction techniques allow NO to pass without reducing engine efficiency X The conversion rate of the fuel is greatly improved, and the fuel economy is better. The prior art monitors SCR efficiency by: calculation of catalyst upstream NO by integration X And downstream NO X Total value, SCR efficiency = 1-downstream NO calculated by equation X Upstream NO X And comparing the model efficiency with a model efficiency or a limit value, wherein the SCR conversion efficiency is reduced when the model efficiency is lower than the limit value. The method is a passive monitoring method of SCR efficiency. The prior art monitors SCR efficiency and is susceptible to ammonia leakage, and when urea is injected too much, the NO collected by a downstream nitrogen-oxygen sensor X The values are ammonia and NO X The calculated SCR efficiency will be below the limit, at which point it will be misjudged that the SCR conversion efficiency is decreasing. Because the prior art monitoring SCR efficiency is too simple, complete and accurate method control and monitoring is required for the most important component SCR systems in the exhaust system.
In summary, how to realize accurate monitoring and control of an SCR system in an exhaust emission system in a diesel vehicle is a technical problem to be solved in the art.
Disclosure of Invention
In view of the above, the application aims to provide a method, a device, equipment and a medium for monitoring an SCR system of diesel vehicle exhaust, which can realize accurate monitoring and control of the SCR system in an exhaust 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 of diesel vehicle exhaust, 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 the preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring the residual ammonia storage value in the SCR catalyst;
comparing the residual ammonia gas storage value with a standard ammonia gas storage value, and stopping the operation of injecting multiple urea if the residual ammonia gas storage value is smaller than the standard ammonia gas storage value;
and calculating the current SCR conversion efficiency based on the residual ammonia gas storage value, 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 tail gas further comprises:
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 the converted tail gas of the SCR system is normal.
Optionally, before the operation of starting the injection of urea multiple times, the method further comprises:
SCR system parameters including the exhaust temperature parameter and the engine run time parameter upstream of the SCR system are obtained in advance.
Optionally, after comparing the remaining ammonia gas stored value with a standard ammonia gas stored value, 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 converted tail gas of the SCR system is normal.
Optionally, the determining the state of the SCR system according to the calculation result, to implement monitoring of the SCR system, includes:
and if the calculated result is smaller than the second efficiency value, judging that the performance of the converted tail gas of the SCR system is abnormal, and alarming to prompt a user.
Optionally, the determining that the performance of the converted tail gas of the SCR system is abnormal, and the warning prompts the user includes:
when the performance of the converted tail gas of the SCR system is judged to be abnormal, the alarm prompts a user and sends a torque limiting instruction to the electronic control unit.
Optionally, the determining the state of the SCR system according to the calculation result, to implement monitoring of the SCR system, includes:
and if the calculated result is larger than the second efficiency value, judging that the performance of the converted tail gas of the SCR system is normal.
In a second aspect, the application discloses an SCR system monitoring device for diesel vehicle exhaust, comprising:
the operation execution module is used for starting the operation of injecting the multiple urea and acquiring the residual ammonia storage value 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 at the upstream of the SCR system and the engine running time parameter meet the preset parameter threshold condition;
the operation ending module is used for comparing the residual ammonia gas storage value with a standard ammonia gas storage value, and stopping the operation of injecting the multiple urea if the residual ammonia gas storage value is smaller than the standard ammonia gas storage value;
and the system monitoring module is used for calculating the current SCR conversion efficiency based on the residual ammonia gas storage value, acquiring a corresponding calculation result, judging the state of the SCR system by using the calculation result, and realizing 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;
and the processor is used for executing the computer program to realize the steps of the method for monitoring the SCR system of the tail gas of the diesel vehicle.
In a fourth aspect, the present application discloses a computer-readable storage medium for storing a computer program; the method comprises the steps of a method for monitoring the SCR system of the tail gas of the diesel vehicle, wherein the method comprises the steps of realizing the method for monitoring the SCR system of the tail gas of the diesel vehicle when the computer program is executed by a processor.
The application discloses a monitoring method of an SCR system of diesel vehicle tail gas, 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 the preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring the residual ammonia storage value in the SCR catalyst; comparing the residual ammonia gas storage value with a standard ammonia gas storage value, and stopping the operation of injecting multiple urea if the residual ammonia gas storage value is smaller than the standard ammonia gas storage value; and calculating the current SCR conversion efficiency based on the residual ammonia gas storage value, 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 the passive monitoring is further monitored, the problem that the false judgment of the SCR conversion efficiency is low due to ammonia leakage is avoided, the performance of the SCR system is accurately judged, the occurrence of false alarm is reduced, and the calculated SCR conversion efficiency is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for monitoring an SCR system of diesel vehicle exhaust;
FIG. 2 is a functional schematic of autonomous monitoring in accordance with the present disclosure;
FIG. 3 is a graph of average efficiency of a passively monitored SCR in accordance with the present disclosure;
FIG. 4 is a graph of average efficiency of an actively monitored SCR in accordance with the present disclosure;
FIG. 5 is a flow chart of a specific method for monitoring the SCR system of the tail gas of the diesel vehicle;
FIG. 6 is a graph of calculated SCR average efficiency during a urea non-injection phase of the present disclosure;
FIG. 7 is a graph showing calculated average efficiency of your SCR during a purge phase in accordance with the present disclosure;
FIG. 8 is a flow chart of a method for preventing cheating in an SCR system in accordance with the present disclosure;
FIG. 9 is a schematic diagram of a monitoring device of an SCR system for diesel exhaust;
fig. 10 is a block diagram of an electronic device according to the present disclosure.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
At present, the SCR technology using urea as a reducing agent has been widely used as an important means for controlling the exhaust emission of a heavy diesel engine due to the advantages of improving fuel consumption, stronger sulfur poisoning resistance and the like by optimizing in-cylinder combustion, and plays an important role in improving the atmospheric pollution caused by the exhaust of the diesel automobile. Exhaust of NO from engine combustion chamber X Mixing with urea injected into exhaust pipe to decompose ammonia, adding under the action of catalystThe reaction is fast to harmless ammonia and water. Selective catalytic reduction techniques allow NO to pass without reducing engine efficiency X The conversion rate of the fuel is greatly improved, and the fuel economy is better. The prior art monitors SCR efficiency by: calculation of catalyst upstream NO by integration X And downstream NO X Total value, SCR efficiency = 1-downstream NOX/upstream NO calculated by equation X And comparing the model efficiency with a model efficiency or a limit value, wherein the SCR conversion efficiency is reduced when the model efficiency is lower than the limit value. The method is a passive monitoring method of SCR efficiency. The prior art monitors SCR efficiency and is susceptible to ammonia leakage, and when urea is injected too much, the NO collected by a downstream nitrogen-oxygen sensor X The values are ammonia and NO X The calculated SCR efficiency will be below the limit, at which point it will be misjudged that the SCR conversion efficiency is decreasing. Because the prior art monitoring SCR efficiency is too simple, complete and accurate method control and monitoring is required for the most important component SCR systems in the exhaust system.
Therefore, the application provides an SCR system monitoring scheme for tail gas of a diesel vehicle, which can realize accurate monitoring and control of an SCR system in a tail gas emission system in the diesel vehicle.
Referring to fig. 1, the embodiment of the application discloses a monitoring method of an SCR system of diesel vehicle tail gas, which comprises the following steps:
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 the preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring the residual ammonia storage value in the SCR catalyst.
In this embodiment, the SCR (Selective Catalytic Reduction) selective catalytic reduction system is mainly a diesel engine exhaust gas post-treatment system, and is used for treating nitrogen oxides in engine exhaust gas, and mainly uses ammonia decomposed by urea as a reducing agent to convert toxic nitrogen oxides in exhaust gas into nontoxic nitrogen and water through selective catalytic reduction reaction. The existing passive monitoring SCR efficiency is easily affected by ammonia leakage, so that the monitored SCR efficiency is more accurate, and the passive monitoring condition is satisfiedWhen the NO of the upstream and downstream nitrogen-oxygen sensors is calculated by integration X And accumulating values, and calculating the average efficiency of passive monitoring, wherein the average efficiency of passive monitoring is calculated according to the formula: passive average efficiency = 1-downstream NO X Cumulative value/upstream NO X Cumulative value, where NO X Comprising 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 the functional schematic diagram of autonomous monitoring shown in fig. 2, it can be seen that the average efficiency of SCR conversion in the normal state is far higher than the average efficiency of SCR conversion in the failure state, and the maximum ammonia storage amount of SCR in the normal state is greater than the maximum ammonia storage amount of SCR in the failure state, and after active monitoring is activated, 3 times of urea injection is controlled, so that the ammonia storage of the SCR catalyst is quickly maximized. Stopping urea injection after SCR reaches maximum ammonia storage, and completely mixing stored ammonia with NO in tail gas X Reaction, if normal SCR, stores ammonia sufficiently to react with NO X The reduction capability during the reaction is high, and the conversion efficiency is high; in the case of a spent SCR, little ammonia is stored, with NO X The catalytic reduction capacity of (c) drops drastically and the calculated average conversion efficiency is very low. In the urea non-injection stage, the average conversion efficiency of the normal SCR and the failure SCR has high degree of distinction, and the method is used for judging the reduction of the SCR efficiency. The automatic monitoring can well avoid the influence of ammonia leakage on SCR efficiency in the emptying stage, the calculated average efficiency is accurate, as shown in fig. 3, the SCR passive monitoring average efficiency result is tested by a normal SCR system operation WHTC cycle, namely, a normalized rotating speed and torque continuous test point of the SCR system which changes rapidly along with time, as shown in fig. 4, the failure SCR system operation WHTC cycle is tested, and the SCR passive monitoring average efficiency result is tested.
In this embodiment, when the SCR conversion efficiency of the SCR system is higher than the first efficiency value set by passive monitoring, the performance of converting the tail gas of the SCR system is judged to be normal. It will be appreciated that when NO is obtained from the corresponding upstream and downstream nitroxide sensors by passive monitoring X After accumulating data information such as values, calculating the average conversion efficiency of passive monitoring and the efficiency or limit value of the model through integral operationAnd comparing, wherein if the comparison result is higher than the efficiency or the limit value of the model, namely, the first efficiency value set by the passive monitoring, the performance of the converted tail gas of the SCR system is indicated to be 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 urea multiple times, the method further includes: SCR system parameters including the exhaust temperature parameter and the engine run time parameter upstream of the SCR system are obtained in advance. It can be appreciated that the engine speed, torque, exhaust flow are obtained, and the NOx sensor NO X And the value, such as an upstream SCR temperature discharge sensor value, is used for calculating the SCR average efficiency under passive monitoring by utilizing the information such as the data, and then monitoring the SCR upstream temperature discharge and the engine running time, and controlling urea to perform multiple injection operation by monitoring the temperature range of the SCR upstream temperature discharge value and the running time of a transmitter to reach a preset range interval, so that the urea multiple injection stage is entered. For example: the temperature value of the exhaust gas at the upstream of the SCR is within the range of 240-340, after the running time of the engine exceeds 500s, the engine enters into a urea multiple injection stage, namely an over-injection stage, and the urea injection is carried out in the over-injection stage to be injected into the SCR catalyst with 3 times of basic injection quantity to form NO X The ammonia remaining after the reaction can be stored in the SCR catalyst faster. When the SCR catalyst stores ammonia to a maximum, ammonia gas that is not reacted completely and cannot be stored is discharged to the end of the exhaust pipe.
Step S12: and comparing the residual ammonia gas storage value with a standard ammonia gas storage value, and stopping the operation of injecting the multiple urea if the residual ammonia gas storage value is smaller than the standard ammonia gas storage value.
In this embodiment, the stored ammonia value, that is, the remaining ammonia gas stored value, is calculated by the calculation formula: remaining ammonia storage value = total urea injection amount-reacted urea amount, calculating remaining ammonia storage value, then comparing the remaining ammonia storage value with standard ammonia storage value, if the remaining ammonia storage value is smaller than the standard ammonia storage value, stopping the operation of injecting multiple urea, it is understood that if it is smaller than the standard ammonia storage value, this means that the current catalytic reduction reaction has already been performedThe reaction is complete, the conversion efficiency of SCR is very high, the conversion efficiency is not reduced, and the stored ammonia gas completely reacts with NO in the tail gas X In response, if a normal SCR is used, the ammonia stored is sufficient to react with NO X The reduction capability during the reaction is high, the conversion efficiency is high, the operation of injecting multiple times of urea is stopped, the urea non-injection stage is entered, if the SCR is in failure, the stored ammonia is little, the catalytic reduction capability with NOx is rapidly reduced, and the calculated average conversion efficiency is low.
In this embodiment, after comparing the remaining ammonia gas stored value with the standard ammonia gas stored value, 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 converted tail gas of the SCR system is normal. If the remaining ammonia storage value is greater than the standard ammonia storage value, the SCR can be immediately judged to be normal.
Step S13: and calculating the current SCR conversion efficiency based on the residual ammonia gas storage value, 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 remaining ammonia storage value, and a corresponding calculation result is obtained, and it can be understood that the 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 determined by using the calculation result, monitoring of the SCR system is achieved, the state of the SCR system is determined again based on the calculation result, a conclusion that the current SCR system is in an accurate state of a normal state or an abnormal state is obtained, and the state of the SCR system is accurately determined by a mode of combining passive monitoring and active monitoring, so that the state monitoring of the SCR system is achieved.
The application discloses a monitoring method of an SCR system of diesel vehicle tail gas, 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 the preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring the residual ammonia storage value in the SCR catalyst; comparing the residual ammonia gas storage value with a standard ammonia gas storage value, and stopping the operation of injecting multiple urea if the residual ammonia gas storage value is smaller than the standard ammonia gas storage value; and calculating the current SCR conversion efficiency based on the residual ammonia gas storage value, 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 the passive monitoring is further monitored, the problem that the false judgment of the SCR conversion efficiency is low due to ammonia leakage is avoided, the performance of the SCR system is accurately judged, the occurrence of false alarm is reduced, and the calculated SCR conversion efficiency is more accurate.
Referring to fig. 5, an embodiment of the present application discloses a specific method for monitoring an SCR system of diesel exhaust, and compared with the previous embodiment, the present embodiment further describes and optimizes a technical solution. Specific:
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 the preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring the residual ammonia storage value in the SCR catalyst.
Step S22: and comparing the residual ammonia gas storage value with a standard ammonia gas storage value, and stopping the operation of injecting the multiple urea if the residual ammonia gas storage value is smaller than the standard ammonia gas storage value.
The more detailed processing procedures in steps S21, S22 and S23 refer to the above disclosed embodiments, and are not described herein.
Step S23: and calculating the current SCR conversion efficiency based on the residual ammonia gas storage value, and obtaining a corresponding calculation result.
In this embodiment, referring to fig. 6, when the calculated remaining ammonia storage value is lower than the standard ammonia storage limit value, the urea non-injection stage is entered, the SCR average conversion efficiency at this stage is calculated, and the comparison between the current SCR average conversion efficiency and the efficiency or limit value of the model during passive monitoring can be obtained.
Step S24: and if the calculated result is smaller than the second efficiency value, judging that the performance of the converted tail gas of the SCR system is abnormal, and alarming to prompt a user.
In this embodiment, the second efficiency value, that is, the efficiency or the limit value of the model during passive monitoring, so that when the calculation result, that is, the current SCR average conversion efficiency, is lower than the limit value, it is diagnosed that the SCR conversion efficiency is reduced, fault information generated by active monitoring is reported, the fault affecting the emission performance of the engine is diagnosed by an OBD (on-board diagnostics) system, that is, computer systems installed on the automobile and the engine, belonging to the pollution control device, and when the fault occurs, the fault is displayed by an alarm system, a possible fault area is determined by information stored in a memory of the electronic control unit, and information offline communication is provided. Referring to fig. 7, the average efficiency calculated in the urea non-injection stage is smaller than the average efficiency limit value, the conversion efficiency of the SCR system is judged to be reduced, alarm information is activated, a limit torque instruction is sent to the ECU, when the performance of the converted tail gas of the SCR system is judged to be abnormal, the alarm prompts a user and sends the limit torque instruction to the electronic control unit, the alarm information and the limit torque instruction are sent to the ECU, the ECU is the electronic control unit, also called a "driving computer" or a "vehicle-mounted computer", and is a microcomputer controller special for a vehicle, and the vehicle is composed of a microprocessor, a memory, an input/output interface, an analog-to-digital converter, a driver and other large-scale integrated circuits, and is used for correspondingly controlling the vehicle after receiving the limit torque instruction of the vehicle.
Step S25: and if the calculated result is larger than the second efficiency value, judging that the performance of the converted tail gas of the SCR system is normal.
In this embodiment, if the calculation result is greater than the second efficiency value and is not consistent with the result that the average efficiency detected during the passive monitoring is less than the limit value, the performance of the converted tail gas of the current SCR system is judged to be normal according to the current technical result, and the method is more perfect than the passive monitoring logic, so that the situation of false alarm is avoided, the method can react under the situation of cheating, the torque output of the engine is limited, and the situation of exceeding emission standard is prevented. Referring to fig. 8, an engine is started normally to obtain the engine speedTorque, exhaust flow, NOx sensor NO X The value, the upstream SCR temperature sensor value and other parameters are measured, then the average efficiency result of the passive monitoring of the SCR is tested through the WHTC (engine emission test) cycle of the normal SCR system operation, if the average efficiency of the passive monitoring SCR is higher than the limit value, the operation efficiency of the current SCR system is normal, the SCR system is judged to be normal at the moment, the problem of conversion efficiency reduction does not occur, and alarm information is not sent; if the average efficiency of the passive monitoring SCR is lower than the limit value, judging the current SCR system as a failure SCR system, running a WHTC cycle, performing active monitoring, monitoring the upstream exhaust temperature of the SCR and the running time of the engine so as to judge whether to enter a urea multiple injection stage, calculating the ammonia storage value at the moment, if the ammonia storage value is higher than the limit value, judging that the error occurs during the passive monitoring, misjudging that the conversion efficiency of the SCR system at the moment is low, if the ammonia storage value at the moment is lower 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 lower than the limit value, judging the current SCR system as the failure system, sending corresponding alarm information and a torque limiting instruction to the ECU, limiting the output of the engine torque and preventing the occurrence of the emission exceeding standard condition; and if the ammonia storage value is larger than the limit value at the moment, 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 multiple times, and the performance of the SCR system can be accurately judged. In the urea non-injection stage, the average conversion efficiency of the normal SCR and the failure SCR has high degree of distinction, and the method is used for judging the reduction of the SCR efficiency. The automatic monitoring can well avoid the influence of ammonia leakage on SCR efficiency in the emptying stage, the calculated average efficiency is accurate, and whether the SCR system is normal or not is further accurately judged.
Referring to fig. 9, the embodiment of the application discloses a specific monitoring device for an SCR system of diesel vehicle tail gas, which comprises:
the operation execution module 11 is configured to start an operation of injecting multiple urea and obtain a remaining ammonia storage value 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 upstream of the SCR system meet a preset parameter threshold condition;
an operation ending module 12, configured to compare the remaining ammonia gas stored value with a standard ammonia gas stored value, and if the remaining ammonia gas stored value is smaller than the standard ammonia gas stored value, stop the operation of injecting multiple urea;
and the system monitoring module 13 is used for calculating the current SCR conversion efficiency based on the residual ammonia storage value, acquiring a corresponding calculation result, judging the state of the SCR system by using the calculation result, and realizing the monitoring of the SCR system.
The application discloses a monitoring method of an SCR system of diesel vehicle tail gas, 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 the preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring the residual ammonia storage value in the SCR catalyst; comparing the residual ammonia gas storage value with a standard ammonia gas storage value, and stopping the operation of injecting multiple urea if the residual ammonia gas storage value is smaller than the standard ammonia gas storage value; and calculating the current SCR conversion efficiency based on the residual ammonia gas storage value, 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 the passive monitoring is further monitored, the problem that the false judgment of the SCR conversion efficiency is low due to ammonia leakage is avoided, the performance of the SCR system is accurately judged, the occurrence of false alarm is reduced, and the calculated SCR conversion efficiency is more accurate.
Further, the embodiment of the present application further discloses an electronic device, and fig. 10 is a block diagram of an electronic device 20 according to an exemplary embodiment, where the content of the diagram is not to be considered as any limitation on the scope of use of the present application.
Fig. 10 is a schematic structural diagram of an electronic device 20 according to an embodiment of the present application. 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. The memory 22 is configured to store a computer program, and the computer program is loaded and executed by the processor 21 to implement relevant steps in the method for monitoring an SCR system of a diesel exhaust gas disclosed in any 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 an operating 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 the communication protocol to be followed is any communication protocol applicable to the technical solution of the present application, which is not specifically limited herein; the input/output interface 25 is used for acquiring external input data or outputting external output data, and the specific interface type thereof may be selected according to the specific application requirement, which is not limited herein.
Processor 21 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 may be implemented in at least one hardware form of DSP (Digital Signal Processing ), FPGA (Field-Programmable Gate Array, field programmable gate array), PLA (Programmable Logic Array ). The processor 21 may also comprise a main processor, which is a processor for processing data in an awake state, also called CPU (Central Processing Unit ); a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 21 may integrate a GPU (Graphics Processing Unit, image processor) for rendering and drawing of content required to be displayed by the display screen. In some embodiments, the processor 21 may also include an AI (Artificial Intelligence ) processor for processing computing operations related to machine learning.
The memory 22 may be a carrier for storing resources, such as a read-only memory, a random access memory, a magnetic disk, or an optical disk, and the resources stored thereon may include an operating system 221, a computer program 222, and the like, and the storage may be temporary storage or permanent storage.
The operating system 221 is used for managing and controlling various hardware devices on the electronic device 20 and the computer program 222, so as to implement the operation and processing of the processor 21 on the mass data 223 in the memory 22, which may be Windows Server, netware, unix, linux, etc. 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 SCR system monitoring method of diesel exhaust that is performed by the electronic device 20 as disclosed in any of the previous embodiments. The data 223 may include, in addition to data received by the electronic device and transmitted by the external device, data collected by the input/output interface 25 itself, and so on.
Further, the application also discloses a computer readable storage medium for storing a computer program; the computer program, when executed by the processor, realizes the method for monitoring the SCR system of the tail gas of the diesel vehicle. For specific steps of the method, reference may be made to the corresponding contents disclosed in the foregoing embodiments, and no further description is given here.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
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 elements and steps are described above generally in terms of functionality in order to clearly illustrate the 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 solution. 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. The software modules may be disposed 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 is further noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like 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 tail gas are described in detail, and specific examples are applied to the explanation of the principle and the implementation mode of the application, and the explanation of the examples is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (7)
1. An SCR system monitoring method for diesel vehicle exhaust, 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 the preset parameter threshold condition, starting the operation of injecting multiple urea and acquiring the residual ammonia storage value in the SCR catalyst;
comparing the residual ammonia gas storage value with a standard ammonia gas storage value, and stopping the operation of injecting multiple urea if the residual ammonia gas storage value is smaller than the standard ammonia gas storage value;
calculating the current SCR conversion efficiency based on the residual ammonia gas storage value, 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;
wherein after comparing the remaining ammonia gas stored value with a standard ammonia gas stored value, the method further comprises:
if the residual ammonia gas storage value is larger than the standard ammonia gas storage value, judging that the performance of the converted tail gas of the SCR system is normal;
the step of judging the state of the SCR system by using the calculation result to realize the monitoring of the SCR system comprises the following steps:
if the calculated result is smaller than the second efficiency value, judging that the performance of the converted tail gas of the SCR system is abnormal, and alarming to prompt a user; and if the calculated result is larger than the second efficiency value, judging that the performance of the converted tail gas of the SCR system is normal.
2. The method for monitoring an SCR system of a diesel vehicle exhaust as defined in 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 the converted tail gas of the SCR system is normal.
3. The method for monitoring an SCR system for a diesel vehicle exhaust as defined in claim 1, further comprising, prior to said initiating the operation of injecting multiple urea:
SCR system parameters including the exhaust temperature parameter and the engine run time parameter upstream of the SCR system are obtained in advance.
4. The method for monitoring the SCR system of the diesel vehicle exhaust according to claim 1, wherein the determining that the performance of the converted exhaust of the SCR system is abnormal, and the warning prompt user, comprises:
when the performance of the converted tail gas of the SCR system is judged to be abnormal, the alarm prompts a user and sends a torque limiting instruction to the electronic control unit.
5. An SCR system monitoring device for diesel vehicle exhaust, comprising:
the operation execution module is used for starting the operation of injecting the multiple urea and acquiring the residual ammonia storage value 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 at the upstream of the SCR system and the engine running time parameter meet the preset parameter threshold condition;
the operation ending module is used for comparing the residual ammonia gas storage value with a standard ammonia gas storage value, and stopping the operation of injecting the multiple urea if the residual ammonia gas storage value is smaller than the standard ammonia gas storage value;
the system monitoring module is used for calculating the current SCR conversion efficiency based on the residual ammonia gas storage value, acquiring a corresponding calculation result, judging the state of the SCR system by using the calculation result, and realizing the monitoring of the SCR system;
wherein, SCR system monitoring devices still is used for:
if the residual ammonia gas storage value is larger than the standard ammonia gas storage value, judging that the performance of the converted tail gas of the SCR system is normal;
the system monitoring module is specifically configured to:
if the calculated result is smaller than the second efficiency value, judging that the performance of the converted tail gas of the SCR system is abnormal, and alarming to prompt a user; and if the calculated result is larger than the second efficiency value, judging that the performance of the converted tail gas of the SCR system is normal.
6. An electronic device, comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the SCR system monitoring method of diesel vehicle exhaust according to any one of claims 1 to 4.
7. A computer-readable storage medium storing a computer program; wherein the computer program, when executed by a processor, implements the steps of the SCR system monitoring method of diesel vehicle exhaust according to any one of claims 1 to 4.
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