CN118327748A - Ammonia leakage risk identification method and device for exhaust gas treatment system and motor vehicle - Google Patents
Ammonia leakage risk identification method and device for exhaust gas treatment system and motor vehicle Download PDFInfo
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- CN118327748A CN118327748A CN202410456756.0A CN202410456756A CN118327748A CN 118327748 A CN118327748 A CN 118327748A CN 202410456756 A CN202410456756 A CN 202410456756A CN 118327748 A CN118327748 A CN 118327748A
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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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
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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
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
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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
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
- 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
- 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
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. by adjusting the 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to an ammonia leakage risk identification method and device of an exhaust gas treatment system and a motor vehicle, wherein temperature data in a set time period of the exhaust gas treatment system are obtained, and temperature distribution data are determined; in the obtained temperature distribution data, when the upstream temperature of the selective catalytic reduction system meets a threshold value, corresponding temperature duty ratio data meet the threshold value, and corresponding ammonia conversion efficiency meets the threshold value, ammonia leakage risks exist in corresponding working conditions; when there is a risk of ammonia slip, thermal management is performed by varying the upstream temperature of the selective catalytic reduction system to control the amount of ammonia slip under high risk conditions. And the risk caused by ammonia leakage is accurately identified by establishing corresponding judgment logic through influencing the weight by factors influencing the ammonia leakage, and corresponding control adjustment is carried out, so that the adaptability of the tail gas treatment control process is improved.
Description
Technical Field
The invention relates to the technical field of tail gas treatment, in particular to an ammonia leakage risk identification method and device of a tail gas treatment system and a motor vehicle.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The tail gas generated after the diesel engine works can reach the emission standard after being treated by a tail gas treatment system, and in the tail gas treatment system, stored urea is used as a source of ammonia, and various harmful substances in the tail gas are subjected to innocent treatment under the action of a certain temperature and a catalyst, such as NOx is converted into nitrogen, carbon dioxide and water; the catalyst inevitably undergoes regeneration, slight sulfur and phosphorus poisoning and abnormal high temperature generated under special conditions in the actual use process in a manner of combustion after particulate matter is paved, and the conditions can lead to different degrees of efficiency reduction of treatment effect, which is often represented by reduction of ammonia conversion efficiency of SCR (selective catalytic reducer) and ammonia conversion efficiency of ASC (ammonia slip catalyst).
Meanwhile, the catalyst has different catalytic capacities according to different formulas, and usually reacts on a characteristic curve, and in a sensitive area of key characteristics of the catalyst, conversion efficiency is reduced, and the condition of reduced ammonia conversion efficiency can cause false alarm of an NOx emission diagnosis system mounted on an engine, namely the actual NOx leakage risk is not high, but the NOx sensor cannot distinguish whether currently detected ammonia is NOx from tail gas or the NOx from ammonia leakage due to the combined action of the excessive ammonia leakage and the cross sensitivity of the NOx sensor.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides an ammonia leakage risk identification method and device of an exhaust gas treatment system and a motor vehicle, wherein the method and device identify possible ammonia leakage risk according to temperature distribution data and ammonia conversion efficiency under corresponding working conditions, and reduce the risk caused by ammonia leakage through corresponding control and adjustment.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A first aspect of the present invention provides a method for identifying risk of ammonia leakage in an exhaust gas treatment system, comprising the steps of:
acquiring temperature data in a set time period of the tail gas treatment system, and determining temperature distribution data;
in the obtained temperature distribution data, when the upstream temperature of the selective catalytic reduction system meets a threshold value, corresponding temperature duty ratio data meet the threshold value, and corresponding ammonia conversion efficiency meets the threshold value, ammonia leakage risks exist in corresponding working conditions;
When there is a risk of ammonia slip, thermal management is performed by varying the upstream temperature of the selective catalytic reduction system to control the amount of ammonia slip under high risk conditions.
Further, when the upstream temperature of the selective catalytic reduction system meets a threshold, and the corresponding temperature duty ratio data meets the threshold, and the corresponding ammonia conversion efficiency meets the threshold, the corresponding working conditions have ammonia leakage risk, specifically:
The ratio of the upstream temperature of the selective catalytic reduction system to the first temperature set point is smaller than the first percentage, the ratio of the upstream temperature of the selective catalytic reduction system to the second temperature set point is smaller than the second percentage, and the ammonia conversion efficiency of the selective catalytic reduction system is reduced by a third set percentage compared with a reference value, so that the corresponding working condition has the risk of ammonia leakage.
Further, thermal management, comprising: and when the temperature of the upstream of the selective catalytic reduction system exceeds the threshold value and lasts for a first set period of time, and the corresponding ammonia conversion efficiency shows a change trend of decreasing first and then rising, the thermal management is exited.
Further, thermal management, further comprising: the ammonia conversion efficiency of the selective catalytic reduction system satisfies the threshold for a second set period of time and continues to exceed a third set period of time, exiting thermal management.
Further, when there is a risk of ammonia leakage, the ammonia injection amount correction is performed, specifically: and adjusting and setting the ammonia storage amount according to the corresponding working condition, reducing the ammonia injection amount, and recovering injection when the ammonia conversion efficiency is recovered to be normal and begins to decline.
A second aspect of the present invention provides an ammonia leakage risk identification device for an exhaust gas treatment system
The data acquisition device is used for acquiring temperature data in a set time period of the tail gas treatment system and sending the temperature data to the processor;
A processor configured to: receiving temperature data acquired by a data acquisition unit and converting the temperature data into temperature distribution data;
a processor, further configured to: when the upstream temperature of the selective catalytic reduction system meets a threshold value, corresponding temperature duty ratio data meets the threshold value, and corresponding ammonia conversion efficiency meets the threshold value, ammonia leakage risks exist in corresponding working conditions, corresponding thermal management instructions or ammonia injection quantity correction instructions are sent out, and the ammonia leakage quantity under high-risk working conditions is controlled.
Further, the thermal management instructions include: and when the temperature of the upstream of the selective catalytic reduction system exceeds the threshold value and lasts for a first set period of time, and the corresponding ammonia conversion efficiency shows a change trend of decreasing first and then rising, the thermal management is exited.
Further, the thermal management instructions further comprise: the ammonia conversion efficiency of the selective catalytic reduction system satisfies the threshold for a second set period of time and continues to exceed a third set period of time, exiting thermal management.
Further, the ammonia injection amount correction command specifically includes: and adjusting and setting the ammonia storage amount according to the corresponding working condition, reducing the ammonia injection amount, and recovering injection when the ammonia conversion efficiency is recovered to be normal and begins to decline.
A third aspect of the invention provides a motor vehicle incorporating the apparatus described above for identifying a risk of ammonia leakage in an exhaust gas treatment system of a motor vehicle.
Compared with the prior art, the above technical scheme has the following beneficial effects:
Based on the characteristics of the catalyst, judging whether the efficiency of the catalyst is normal according to the temperature distribution data and the ammonia conversion efficiency under the corresponding working condition, and if the catalyst has an efficiency inflection point in an efficient conversion interval under the premise of normal catalyst, judging that the catalyst is misinformation caused by ammonia leakage, thereby identifying possible ammonia leakage risk, and reducing the risk brought by ammonia leakage through thermal management or injection correction.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic representation of the efficiency characteristics of a catalyst during exhaust treatment provided by one or more embodiments of the present invention;
FIG. 2 is a schematic illustration of the reduction in efficiency due to ammonia slip during exhaust treatment provided by one or more embodiments of the present invention;
FIG. 3 is a schematic diagram of an ammonia slip risk identification process for an exhaust treatment system according to one or more embodiments of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Term interpretation:
EGR, an exhaust gas recirculation technique, a technique of separating part of exhaust gas (exhaust gas) and introducing the exhaust gas into an intake side to participate in combustion again, can reduce nitrogen oxides (NOx) in the exhaust gas, and can share part of load, thereby improving fuel consumption.
DOC, oxidation catalyst, device for converting carbon monoxide (CO) and Hydrocarbon (HC) in tail gas into harmless water (H2O) and carbon dioxide (CO 2) through oxidation reaction
DPF, diesel engine particle catcher, spread the particulate matter in the diesel engine tail gas through the filter body, the particulate matter that spreads on the filter body makes its innocent treatment with exhaust temperature burning, and the filter body regenerates.
SCR, a selective catalytic reduction system, sprays reductant NH 3 into the processor under the action of catalyst to reduce NO and NO 2 to N 2. The reductant NH 3 is typically urea, stored in liquid form in a container, in the following examples abbreviated as ammonia storage.
An ASC, ammonia slip catalyst, typically disposed at the rear end of the SCR, means for reducing the ammonia (NH 3) that leaks out of the exhaust gas at the rear end of the SCR by catalytic oxidation.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The exhaust gas discharged from the diesel engine usually reaches the standard and is discharged by using a technical route of egr+doc+dpf+scr+asc, in order to ensure the exhaust gas treatment effect, excessive ammonia (commonly used urea is used as an ammonia source) is sprayed into the exhaust gas, and in order to avoid that the excessive ammonia is discharged into the atmosphere, the excessive ammonia is converted into nitrogen by using an Ammonia Slip Catalyst (ASC) under the action of a built-in catalyst. However, different types of catalysts have different characteristic curves, as shown in fig. 1, in the sensitive area of the key characteristics of the catalyst, the ammonia conversion efficiency is reduced, and the condition of the reduced ammonia conversion efficiency can cause false alarm of NOx emission diagnosis, that is, the actual risk of NOx leakage is not high, but the NOx sensor cannot distinguish whether the currently detected ammonia is from NOx in the exhaust gas or from ammonia leakage caused by injection of excessive urea due to combined action of excessive ammonia leakage and cross sensitivity of the NOx sensor.
Therefore, the following embodiments provide an ammonia slip risk identification method and apparatus for an exhaust gas treatment system, and a motor vehicle, wherein the ammonia slip risk identification method and apparatus consider that a nitrogen-oxygen sensor can identify NH 3 as nox due to cross sensitivity, and if the ammonia slip is caused in a conversion zone where the catalyst is efficient, it is determined whether the catalyst efficiency is normal based on the characteristics of the catalyst.
Embodiment one:
as shown in fig. 1-2, the ammonia leakage risk identification method of the exhaust gas treatment system comprises the following steps:
acquiring temperature data in a set time period of the tail gas treatment system, and determining temperature distribution data;
in the obtained temperature distribution data, when the upstream temperature of the selective catalytic reduction system meets a threshold value, corresponding temperature duty ratio data meet the threshold value, and corresponding ammonia conversion efficiency meets the threshold value, ammonia leakage risks exist in corresponding working conditions;
When there is a risk of ammonia slip, thermal management is performed by varying the upstream temperature of the selective catalytic reduction system to control the amount of ammonia slip under high risk conditions.
Judging that ammonia leakage risk exists through the following conditions:
The ratio of the upstream temperature of the selective catalytic reduction system to the first temperature set point is smaller than the first percentage, the ratio of the upstream temperature of the selective catalytic reduction system to the second temperature set point is smaller than the second percentage, and the ammonia conversion efficiency of the selective catalytic reduction system is reduced by a third set percentage compared with a reference value, so that the corresponding working condition has the risk of ammonia leakage.
Thermal management, comprising: changing the temperature, and exiting the thermal management when the upstream temperature of the selective catalytic reduction system exceeds a threshold value and lasts for a first set period of time, and the corresponding ammonia conversion efficiency shows a change trend of decreasing first and then rising; or, in the second set period, the ammonia conversion efficiency of the selective catalytic reduction system meets the threshold and continues to exceed the third set period, and the thermal management is exited.
When there is a risk of ammonia leakage, ammonia injection amount correction is performed, specifically: and adjusting and setting the ammonia storage amount according to the corresponding working condition, reducing the ammonia injection amount, and recovering injection when the ammonia conversion efficiency is recovered to be normal and begins to decline.
In this embodiment, based on the ammonia storage characteristic and ASC characteristic map, key characteristic amounts are extracted under the following specific conditions:
Counting the temperature distribution duty ratio distribution of X hours (calibrated based on actual conditions) to obtain a temperature distribution duty ratio curve;
taking the ratio of the upstream temperature of SCR to <260 ℃ as >80%, and the ratio of the upstream temperature of SCR to >320 ℃ as <5%, and the SCR conversion efficiency as < threshold value (for example, 15% -20% lower than a reference value, especially the efficiency change characteristic with temperature, and the efficiency drop is obvious at certain temperatures, such as 280 ℃), as the condition for judging the ammonia leakage risk;
the specific threshold points or threshold intervals such as the temperature, the duty ratio, the conversion efficiency and the like related to the above judgment conditions can be determined according to characteristic differences such as ammonia storage, conversion efficiency and the like caused by different catalyst formulations, and the embodiment is only illustrative.
When the conditions are met, the ammonia leakage risk exists in the current working condition, the ammonia leakage control mode is entered, and the thermal management or ammonia (urea) injection quantity correction is carried out, so that the deviation of the control model is eliminated, the ammonia leakage quantity under the high-risk working condition is controlled, and the ammonia leakage treatment capacity of the ASC in a sensitive temperature interval is greatly improved.
In this embodiment, the heat management is tried first, and if the operation condition cannot support the improvement of the heat management, the ammonia injection amount correction is executed again.
1. The heat management is specifically as follows: the temperature duty ratio is increased, the absolute deviation is reduced to a controllable range, and the control conditions are as follows:
the upstream temperature of SCR is more than 320 ℃, the duration time is more than Xmin, the SCR conversion efficiency shows a trend of decreasing firstly and then rising, the deviation elimination is judged to be successful, and the heat management is exited;
Or, within Y hours, the accumulation time of SCR conversion efficiency meeting the threshold is more than 2Xmin, the deviation elimination is judged to be successful, and the thermal management is exited;
2. the ammonia (urea) injection amount is corrected, specifically: based on the current working condition, the deviation amount of ammonia storage is judged, the set ammonia storage is adjusted, the SCR efficiency is recovered to be normal through gradual injection reduction, and injection is recovered when the SCR efficiency begins to decline. The ammonia injection amount is corrected with the coefficient of the gradual injection decrease as a reference.
This embodiment only considers the typical failure risk of ammonia slip due to conventional hydrothermal aging and ASC consistency differences, and other risks (e.g., sulfur poisoning) are triggered by separate logic, which is not described in detail herein.
The degree of distinction of ammonia leakage under different ammonia storages and temperatures is determined based on the ammonia storage characteristic and ASC efficiency characteristic, and the real ammonia leakage risk can be accurately predicted and identified by combining with the actual application working condition, and prevention and elimination can be carried out by combining with the existing strategy.
Embodiment two:
the embodiment provides an ammonia leakage risk identification device of an exhaust gas treatment system for realizing the method, which comprises the following steps:
the data acquisition device is used for acquiring temperature data in a set time period of the tail gas treatment system and sending the temperature data to the processor;
A processor configured to: receiving temperature data acquired by a data acquisition unit and converting the temperature data into temperature distribution data;
a processor, further configured to: when the upstream temperature of the selective catalytic reduction system meets a threshold value, corresponding temperature duty ratio data meets the threshold value, and corresponding ammonia conversion efficiency meets the threshold value, ammonia leakage risks exist in corresponding working conditions, corresponding thermal management instructions or ammonia injection quantity correction instructions are sent out, and the ammonia leakage quantity under high-risk working conditions is controlled.
Thermal management instructions comprising: changing the temperature, and exiting the thermal management when the upstream temperature of the selective catalytic reduction system exceeds a threshold value and lasts for a first set period of time, and the corresponding ammonia conversion efficiency shows a change trend of decreasing first and then rising;
or, in the second set period, the ammonia conversion efficiency of the selective catalytic reduction system meets the threshold and continues to exceed the third set period, and the thermal management is exited.
The ammonia injection amount correction command specifically includes: and adjusting and setting the ammonia storage amount according to the corresponding working condition, reducing the ammonia injection amount, and recovering injection when the ammonia conversion efficiency is recovered to be normal and begins to decline.
Based on the characteristics of the catalyst, judging whether the efficiency of the catalyst is normal according to the temperature distribution data and the ammonia conversion efficiency under the corresponding working condition, and if the catalyst has an efficiency inflection point in an efficient conversion interval under the premise of normal catalyst, judging that the catalyst is misinformation caused by ammonia leakage, thereby identifying possible ammonia leakage risk, and reducing the risk brought by ammonia leakage through thermal management or injection correction.
Embodiment III:
This embodiment presents a motor vehicle equipped with the device of embodiment two for identifying the risk of ammonia leakage of the motor vehicle exhaust gas treatment system.
Based on the characteristics of the catalyst, judging whether the efficiency of the catalyst is normal according to the temperature distribution data and the ammonia conversion efficiency under the corresponding working condition, and if the catalyst has an efficiency inflection point in an efficient conversion interval under the premise of normal catalyst, judging that the catalyst is misinformation caused by ammonia leakage, thereby identifying possible ammonia leakage risk, and reducing the risk brought by ammonia leakage through thermal management or injection correction.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The ammonia leakage risk identification method of the tail gas treatment system is characterized by comprising the following steps of:
acquiring temperature data in a set time period of the tail gas treatment system, and determining temperature distribution data;
in the obtained temperature distribution data, when the upstream temperature of the selective catalytic reduction system meets a threshold value, corresponding temperature duty ratio data meet the threshold value, and corresponding ammonia conversion efficiency meets the threshold value, ammonia leakage risks exist in corresponding working conditions;
When there is a risk of ammonia slip, thermal management is performed by varying the upstream temperature of the selective catalytic reduction system to control the amount of ammonia slip under high risk conditions.
2. The ammonia slip risk identification method of an exhaust gas treatment system according to claim 1, wherein when an upstream temperature of the selective catalytic reduction system meets a threshold and the corresponding temperature duty data meets the threshold while the corresponding ammonia conversion efficiency meets the threshold, the corresponding conditions are at risk of ammonia slip, specifically:
The ratio of the upstream temperature of the selective catalytic reduction system to the first temperature set point is smaller than the first percentage, the ratio of the upstream temperature of the selective catalytic reduction system to the second temperature set point is smaller than the second percentage, and the ammonia conversion efficiency of the selective catalytic reduction system is reduced by a third set percentage compared with a reference value, so that the corresponding working condition has the risk of ammonia leakage.
3. The ammonia leakage risk identification method of an exhaust gas treatment system according to claim 1, wherein the thermal management comprises: and when the temperature of the upstream of the selective catalytic reduction system exceeds the threshold value and lasts for a first set period of time, and the corresponding ammonia conversion efficiency shows a change trend of decreasing first and then rising, the thermal management is exited.
4. The ammonia leakage risk identification method of an exhaust gas treatment system according to claim 1, wherein the thermal management further comprises: the ammonia conversion efficiency of the selective catalytic reduction system satisfies the threshold for a second set period of time and continues to exceed a third set period of time, exiting thermal management.
5. The ammonia slip risk identification method of an exhaust gas treatment system according to claim 1, wherein when there is a risk of ammonia slip, the ammonia injection amount correction is performed, concretely: and adjusting and setting the ammonia storage amount according to the corresponding working condition, reducing the ammonia injection amount, and recovering injection when the ammonia conversion efficiency is recovered to be normal and begins to decline.
6. The ammonia leakage risk identification device of tail gas treatment system, its characterized in that includes:
the data acquisition device is used for acquiring temperature data in a set time period of the tail gas treatment system and sending the temperature data to the processor;
A processor configured to: receiving temperature data acquired by a data acquisition unit and converting the temperature data into temperature distribution data;
a processor, further configured to: when the upstream temperature of the selective catalytic reduction system meets a threshold value, corresponding temperature duty ratio data meets the threshold value, and corresponding ammonia conversion efficiency meets the threshold value, ammonia leakage risks exist in corresponding working conditions, corresponding thermal management instructions or ammonia injection quantity correction instructions are sent out, and the ammonia leakage quantity under high-risk working conditions is controlled.
7. The ammonia leakage risk identification device of an exhaust gas treatment system of claim 6, wherein the thermal management instructions comprise: and when the temperature of the upstream of the selective catalytic reduction system exceeds the threshold value and lasts for a first set period of time, and the corresponding ammonia conversion efficiency shows a change trend of decreasing first and then rising, the thermal management is exited.
8. The ammonia leakage risk identification device of an exhaust gas treatment system of claim 6, further comprising thermal management instructions: the ammonia conversion efficiency of the selective catalytic reduction system satisfies the threshold for a second set period of time and continues to exceed a third set period of time, exiting thermal management.
9. The ammonia leakage risk recognition device of an exhaust gas treatment system according to claim 6, wherein the ammonia injection amount correction command is specifically: and adjusting and setting the ammonia storage amount according to the corresponding working condition, reducing the ammonia injection amount, and recovering injection when the ammonia conversion efficiency is recovered to be normal and begins to decline.
10. A motor vehicle having an ammonia leakage risk identification device of an exhaust gas treatment system according to any one of claims 6-9.
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