CN112594044A - Aging prediction method and device for post-processing system - Google Patents
Aging prediction method and device for post-processing system Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
- F01N2550/20—Monitoring artificially aged 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1616—NH3-slip from catalyst
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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
Abstract
The invention provides an aging prediction method and device of a post-processing system, wherein the method comprises the steps of carrying out real-time statistics on accumulated time of SCR upstream temperature in preset different temperature intervals; after the SCR fails, multiplying the accumulated time length in each temperature interval by the preset aging rate corresponding to each temperature interval to obtain the thermal aging energy of each temperature interval; adding the thermal aging energy of each temperature interval to obtain the actual thermal aging energy of the SCR; determining whether the post-treatment system is thermally aged or not according to the relation between the thermal aging energy actually suffered by the SCR and a preset thermal aging resistance threshold value of the SCR; and then after determining that the post-processing system is thermally aged, prompting the replacement of the post-processing system. The aging prediction of the post-processing system is realized, the user is reminded of replacing the post-processing system in time, and the emission standard exceeding caused by the aging of the post-processing system is reduced.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a method and a device for predicting aging of an aftertreatment system.
Background
The basic working principle of an aftertreatment system, i.e. an SCR (selective catalytic reduction) system, is: and tail gas enters an exhaust mixing pipe after coming out of the turbine, a urea metering injection device is arranged on the mixing pipe, urea aqueous solution is injected, urea is hydrolyzed and pyrolyzed at high temperature to generate NH3, NOX is reduced on the surface of a catalyst of the SCR system by NH3 and is discharged out of N2, and redundant NH3 is oxidized into N2 to prevent leakage.
At present, the default service life of the post-processing system is consistent with that of the whole machine, and a strategy for predicting the aging of the post-processing system to remind a user of timely replacing the post-processing system is not available, so that the excessive emission caused by the aging of the post-processing system cannot be identified in advance.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for predicting aging of a post-processing system, which are intended to implement aging prediction of the post-processing system, and prompt a user to replace the post-processing system in time, so as to reduce the emission standard exceeding caused by aging of the post-processing system.
In order to achieve the above object, the following solutions are proposed:
in a first aspect, a method for predicting aging of an aftertreatment system is provided, including:
recording the accumulated time length of the SCR upstream temperature in different preset temperature intervals in real time;
judging whether the SCR fails in the running process of the engine, if so, multiplying the accumulated time length in each temperature interval by the preset aging rate corresponding to each temperature interval to obtain the thermal aging energy of each temperature interval;
adding the thermal aging energy of each temperature interval to obtain the actual thermal aging energy of the SCR;
determining whether the post-treatment system is thermally aged or not according to the relation between the thermal aging energy actually suffered by the SCR and a preset thermal aging resistance threshold value of the SCR;
and after determining that the post-treatment system is thermally aged, carrying out post-treatment system replacement prompt.
Preferably, determining whether the aftertreatment system is thermally aged according to a magnitude relation between the thermal aging energy actually received by the SCR and a preset thermal aging resistance threshold of the SCR includes:
and judging whether the actual thermal aging energy of the SCR is larger than a preset thermal aging resistance threshold of the SCR, and if so, determining the thermal aging of the post-treatment system.
Preferably, after the step of determining whether the aftertreatment system is thermally aged according to the magnitude relationship between the thermal aging energy actually received by the SCR and a preset thermal aging resistance threshold of the SCR, the method further includes:
and after determining that the post-treatment system is not thermally aged, judging whether sulfur poisoning occurs or not, if so, regenerating the SCR catalyst, and if not, determining ammonia leakage.
Preferably, the judging whether sulfur poisoning occurs includes:
and stopping injecting the urea, and determining whether sulfur poisoning occurs according to the integral of the difference value of the measurement value of the upstream nitrogen-oxygen sensor of the SCR and the measurement value of the downstream nitrogen-oxygen sensor of the SCR and the preset size relation of the stored value of the ammonia.
Preferably, the determining whether the SCR fails includes:
and judging whether the SCR efficiency is smaller than a preset efficiency threshold value, if so, determining that the SCR is invalid, and if not, determining that the SCR is not invalid.
In a second aspect, an aging prediction apparatus for an aftertreatment system is provided, including:
the accumulated time recording unit is used for recording the accumulated time of the SCR upstream temperature in different preset temperature intervals in real time;
the SCR failure judging unit is used for judging whether the SCR fails or not in the running process of the engine, if so, multiplying the accumulated time length in each temperature interval by the preset aging rate corresponding to each temperature interval to obtain the thermal aging energy of each temperature interval;
the thermal aging energy calculation unit is used for adding the thermal aging energy of each temperature interval to obtain the thermal aging energy actually suffered by the SCR;
the SCR thermal aging judging unit is used for determining whether the post-treatment system is thermally aged or not according to the magnitude relation between the thermal aging energy actually suffered by the SCR and a preset thermal aging resistance threshold value of the SCR;
and the SCR thermal aging prompting unit is used for prompting the replacement of the post-treatment system after the thermal aging of the post-treatment system is determined.
Preferably, the SCR thermal aging determination unit is specifically configured to:
and judging whether the actual thermal aging energy of the SCR is larger than a preset thermal aging resistance threshold of the SCR, and if so, determining the thermal aging of the post-treatment system.
Preferably, the aging prediction device of the post-processing system further includes:
and the sulfur poisoning judgment unit is used for judging whether sulfur poisoning occurs or not after the aftertreatment system is determined not to be thermally aged, if so, regenerating the SCR catalyst, and if not, determining ammonia leakage.
Preferably, the process of determining whether sulfur poisoning occurs by the sulfur poisoning determination unit specifically includes:
and stopping injecting the urea, and determining whether sulfur poisoning occurs according to the integral of the difference value of the measurement value of the upstream nitrogen-oxygen sensor of the SCR and the measurement value of the downstream nitrogen-oxygen sensor of the SCR and the preset size relation of the stored value of the ammonia.
Preferably, the process of determining whether the SCR fails by the SCR failure determination unit specifically includes:
and judging whether the SCR efficiency is smaller than a preset efficiency threshold value, if so, determining that the SCR is invalid, and if not, determining that the SCR is not invalid.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the technical scheme, the aging prediction method and the device for the aftertreatment system are provided, and the method comprises the steps of carrying out real-time statistics on accumulated time lengths of SCR upstream temperatures in preset different temperature intervals; after the SCR fails, multiplying the accumulated time length in each temperature interval by the preset aging rate corresponding to each temperature interval to obtain the thermal aging energy of each temperature interval; adding the thermal aging energy of each temperature interval to obtain the actual thermal aging energy of the SCR; determining whether the post-treatment system is thermally aged or not according to the relation between the thermal aging energy actually suffered by the SCR and a preset thermal aging resistance threshold value of the SCR; and then after determining that the post-processing system is thermally aged, prompting the replacement of the post-processing system. The aging prediction of the post-processing system is realized, the user is reminded of replacing the post-processing system in time, and the emission standard exceeding caused by the aging of the post-processing system is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for predicting aging of an aftertreatment system according to an embodiment of the invention;
fig. 2 is a schematic diagram of an aging prediction apparatus of an aftertreatment system according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an aging prediction method of an aftertreatment system, which mainly aims at a vehicle with a DPF (Diesel Particulate Filter). When the vehicle is provided with the DPF, the failure mode that the SCR of which the catalyst is a copper-based catalyst is damaged mechanically and the catalyst is covered by ash or waste gas pollutants has extremely low occurrence probability, and the method does not consider; the failure mode of SCR is believed to be mainly caused by thermal aging and sulfur poisoning.
Referring to fig. 1, a method for predicting aging of an aftertreatment system according to the embodiment may include the following steps:
s11: and recording the accumulated time length of the SCR upstream temperature in different preset temperature intervals in real time.
The inventors discovered in the course of practicing the invention that the aging rates of the SCR (i.e., the aftertreatment system) are not uniform at different temperatures; therefore, in the embodiment, different temperature intervals are preset, and when the aging prediction of the aftertreatment system is performed, the SCR upstream temperature is taken as the SCR temperature, and the accumulated time of the SCR upstream temperature in the preset different temperature intervals is counted.
It should be noted that, the recorded accumulated time lengths of the temperatures upstream of the SCRs in the preset different temperature intervals are actually to record the accumulated time lengths of the SCRs in the preset different temperature intervals after the SCRs are installed on the vehicle; therefore, after the SCR is installed or replaced, the recorded accumulated time length of the SCR upstream temperature in different preset temperature intervals is cleared, and the statistics is started again.
S12: and judging whether the SCR fails in the running process of the engine, if so, multiplying the accumulated time length in each temperature interval by the preset aging rate corresponding to each temperature interval to obtain the thermal aging energy of each temperature interval.
Judging whether the SCR fails, specifically, the method may include: and judging whether the SCR efficiency is smaller than a preset efficiency threshold value, if so, determining that the SCR is invalid, and if not, determining that the SCR is not invalid. In this embodiment, the specific SCR efficiency value is in a unit time: integral of (N1-N2)/integral of N1. N1 represents the measurement of the nitrogen oxygen concentration sensor upstream of the SCR, and N2 represents the measurement of the nitrogen oxygen concentration sensor downstream of the SCR.
S13: and adding the thermal aging energy of each temperature interval to obtain the actual thermal aging energy of the SCR.
In one embodiment, the preset temperature ranges may be (∞, 500], (500,550], (550,600] and (600,650) respectively corresponding to the accumulated time lengths of the SCR upstream temperatures recorded by the aging rates V1, V2, V3, V4. within preset (∞, 500], (500,550], (550,600 ]), (550,600] and (600,650) respectively being T1, T2, T3, T4, and the actual thermal aging energy to which the SCR is actually subjected is V1 × T1+ V2 × T2+ V3 × T3+ V4 × T4.
S14: and determining whether the post-treatment system is thermally aged or not according to the relation between the thermal aging energy actually suffered by the SCR and the preset thermal aging resistance threshold value of the SCR.
Specifically, whether the actual thermal aging energy of the SCR is greater than a preset thermal aging resistance threshold of the SCR may be determined, and if so, the thermal aging of the aftertreatment system is determined.
S15: and after determining the thermal aging of the post-treatment system, carrying out post-treatment system replacement prompt.
The post-processing system replacement prompt can be specifically carried out in a graphic mode through a display screen on a vehicle, and can also be carried out through a corresponding indicator lamp.
According to the aging prediction method of the aftertreatment system provided by the embodiment, the accumulated time of the SCR upstream temperature in different preset temperature intervals is counted in real time; after the SCR fails, multiplying the accumulated time length in each temperature interval by the preset aging rate corresponding to each temperature interval to obtain the thermal aging energy of each temperature interval; adding the thermal aging energy of each temperature interval to obtain the actual thermal aging energy of the SCR; determining whether the post-treatment system is thermally aged or not according to the relation between the thermal aging energy actually suffered by the SCR and a preset thermal aging resistance threshold value of the SCR; and then after determining that the post-processing system is thermally aged, prompting the replacement of the post-processing system. The aging prediction of the post-processing system is realized, the user is reminded of replacing the post-processing system in time, and the emission standard exceeding caused by the aging of the post-processing system is reduced.
In some embodiments, after step S14, the method further includes: and after determining that the aftertreatment system is not thermally aged, judging whether sulfur poisoning occurs or not, if so, regenerating the SCR catalyst, and if not, determining ammonia leakage. The step of judging whether sulfur poisoning occurs includes: and stopping injecting the urea, and determining whether sulfur poisoning occurs according to the relation between the integral of (N1-N2) and the preset ammonia storage value. N1 represents the measurement of the nitrogen oxygen concentration sensor upstream of the SCR, and N2 represents the measurement of the nitrogen oxygen concentration sensor downstream of the SCR.
In some embodiments, after each driving cycle is finished, whether the aftertreatment system is thermally aged or not can be determined according to the magnitude relation between the thermal aging energy actually suffered by the SCR and a preset thermal aging resistance threshold value of the SCR. And then after the post-processing system is aged, a user is prompted to replace the post-processing system in time, so that the torque and speed limit caused by the fault of the post-processing system is reduced, and the economic loss and potential safety hazard brought to the user are reduced. A timely cycle specifically refers to a continuous process consisting of engine start, running, engine shut down, and time from engine shut down to the next engine start.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention.
The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details which are not disclosed in the embodiments of the apparatus of the present invention, reference is made to the embodiments of the method of the present invention.
Referring to fig. 2, the aging prediction apparatus for an aftertreatment system according to the embodiment includes: an accumulated time length recording unit 21, an SCR failure judgment unit 22, a thermal aging energy calculation unit 23, an SCR thermal aging judgment unit 24, and an SCR thermal aging presentation unit 25.
And the accumulated time length recording unit 21 is used for recording the accumulated time length of the SCR upstream temperature in different preset temperature intervals in real time.
And the SCR failure determination unit 22 is configured to determine whether the SCR fails during the operation of the engine, and if so, multiply the accumulated time length in each temperature interval by a preset aging rate corresponding to each temperature interval to obtain the thermal aging energy of each temperature interval.
And the thermal aging energy calculation unit 23 is configured to add the thermal aging energy of each temperature interval to obtain the thermal aging energy actually suffered by the SCR.
And the SCR thermal aging determination unit 24 is configured to determine whether the aftertreatment system is thermally aged according to a size relationship between the thermal aging energy actually received by the SCR and a preset thermal aging resistance threshold of the SCR.
And the SCR thermal aging prompting unit 25 is used for prompting the replacement of the aftertreatment system after the thermal aging of the aftertreatment system is determined.
The aging prediction device of the aftertreatment system provided by the embodiment comprises an accumulated time length recording unit 21, an SCR failure judgment unit 22, a thermal aging energy calculation unit 23, an SCR thermal aging judgment unit 24 and an SCR thermal aging prompt unit 25. The accumulated time length recording unit 21 counts the accumulated time lengths of the SCR upstream temperatures in different preset temperature intervals in real time; after the SCR failure determination unit 22 determines that the SCR is failed, the accumulated time length in each temperature interval is multiplied by the aging rate corresponding to each preset temperature interval to obtain the thermal aging energy of each temperature interval; the thermal aging energy calculation unit 23 adds the thermal aging energy of each temperature interval to obtain the thermal aging energy actually suffered by the SCR; the SCR thermal aging judgment unit 24 determines whether the post-treatment system is thermally aged or not according to the relationship between the thermal aging energy actually received by the SCR and a preset thermal aging resistance threshold value of the SCR; the SCR thermal aging prompt unit 25 prompts replacement of the aftertreatment system after determining thermal aging of the aftertreatment system. The aging prediction of the post-processing system is realized, the user is reminded of replacing the post-processing system in time, and the emission standard exceeding caused by the aging of the post-processing system is reduced.
In some embodiments, the SCR thermal aging determination unit 24 is specifically configured to: and judging whether the actual thermal aging energy of the SCR is larger than a preset thermal aging resistance threshold of the SCR, and if so, determining the thermal aging of the post-treatment system.
In some embodiments, the post-processing system aging prediction apparatus further comprises: and the sulfur poisoning judgment unit is used for judging whether sulfur poisoning occurs or not after the aftertreatment system is determined not to be thermally aged, if so, regenerating the SCR catalyst, and if not, determining ammonia leakage.
In some embodiments, the process of determining whether sulfur poisoning occurs by the sulfur poisoning determination unit specifically includes: and stopping injecting the urea, and determining whether sulfur poisoning occurs according to the integral of the difference value of the measurement value of the upstream nitrogen-oxygen sensor of the SCR and the measurement value of the downstream nitrogen-oxygen sensor of the SCR and the preset size relation of the stored value of the ammonia.
In some embodiments, the process of determining whether the SCR fails by the SCR failure determination unit 22 specifically includes: and judging whether the SCR efficiency is smaller than a preset efficiency threshold value, if so, determining that the SCR is invalid, and if not, determining that the SCR is not invalid.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are mainly described as different from other embodiments, the same and similar parts in the embodiments may be referred to each other, and the features described in the embodiments in the present description may be replaced with each other or combined with each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for predicting aging of an aftertreatment system, comprising:
recording the accumulated time length of the SCR upstream temperature in different preset temperature intervals in real time;
judging whether the SCR fails in the running process of the engine, if so, multiplying the accumulated time length in each temperature interval by the preset aging rate corresponding to each temperature interval to obtain the thermal aging energy of each temperature interval;
adding the thermal aging energy of each temperature interval to obtain the actual thermal aging energy of the SCR;
determining whether the post-treatment system is thermally aged or not according to the relation between the thermal aging energy actually suffered by the SCR and a preset thermal aging resistance threshold value of the SCR;
and after determining that the post-treatment system is thermally aged, carrying out post-treatment system replacement prompt.
2. The method for predicting aging of an aftertreatment system according to claim 1, wherein determining whether the aftertreatment system is thermally aged according to a magnitude relationship between a thermal aging energy actually experienced by the SCR and a preset thermal aging resistance threshold of the SCR comprises:
and judging whether the actual thermal aging energy of the SCR is larger than a preset thermal aging resistance threshold of the SCR, and if so, determining the thermal aging of the post-treatment system.
3. The method of predicting aging of an aftertreatment system of claim 1, wherein the step of determining whether the aftertreatment system is thermally aged based on a relationship between an amount of thermal aging energy actually experienced by the SCR and a predetermined thermal aging resistance threshold of the SCR further comprises:
and after determining that the post-treatment system is not thermally aged, judging whether sulfur poisoning occurs or not, if so, regenerating the SCR catalyst, and if not, determining ammonia leakage.
4. The aftertreatment system aging prediction method of claim 3, wherein the determining whether sulfur poisoning has occurred comprises:
and stopping injecting the urea, and determining whether sulfur poisoning occurs according to the integral of the difference value of the measurement value of the upstream nitrogen-oxygen sensor of the SCR and the measurement value of the downstream nitrogen-oxygen sensor of the SCR and the preset size relation of the stored value of the ammonia.
5. The aging prediction method of the aftertreatment system according to any one of claims 1 to 4, wherein the determining whether the SCR fails comprises:
and judging whether the SCR efficiency is smaller than a preset efficiency threshold value, if so, determining that the SCR is invalid, and if not, determining that the SCR is not invalid.
6. An aftertreatment system aging prediction apparatus, comprising:
the accumulated time recording unit is used for recording the accumulated time of the SCR upstream temperature in different preset temperature intervals in real time;
the SCR failure judging unit is used for judging whether the SCR fails or not in the running process of the engine, if so, multiplying the accumulated time length in each temperature interval by the preset aging rate corresponding to each temperature interval to obtain the thermal aging energy of each temperature interval;
the thermal aging energy calculation unit is used for adding the thermal aging energy of each temperature interval to obtain the thermal aging energy actually suffered by the SCR;
the SCR thermal aging judging unit is used for determining whether the post-treatment system is thermally aged or not according to the magnitude relation between the thermal aging energy actually suffered by the SCR and a preset thermal aging resistance threshold value of the SCR;
and the SCR thermal aging prompting unit is used for prompting the replacement of the post-treatment system after the thermal aging of the post-treatment system is determined.
7. The aftertreatment system aging prediction device of claim 6, wherein the SCR thermal aging determination unit is specifically configured to:
and judging whether the actual thermal aging energy of the SCR is larger than a preset thermal aging resistance threshold of the SCR, and if so, determining the thermal aging of the post-treatment system.
8. The aftertreatment system aging prediction device of claim 6, further comprising:
and the sulfur poisoning judgment unit is used for judging whether sulfur poisoning occurs or not after the aftertreatment system is determined not to be thermally aged, if so, regenerating the SCR catalyst, and if not, determining ammonia leakage.
9. The aging prediction device of an aftertreatment system according to claim 8, wherein the sulfur poisoning determination unit determines whether a process of sulfur poisoning occurs, specifically comprising:
and stopping injecting the urea, and determining whether sulfur poisoning occurs according to the integral of the difference value of the measurement value of the upstream nitrogen-oxygen sensor of the SCR and the measurement value of the downstream nitrogen-oxygen sensor of the SCR and the preset size relation of the stored value of the ammonia.
10. The aging prediction device of an aftertreatment system according to any one of claims 6 to 9, wherein the SCR failure determination unit determines whether the SCR fails, and specifically includes:
and judging whether the SCR efficiency is smaller than a preset efficiency threshold value, if so, determining that the SCR is invalid, and if not, determining that the SCR is not invalid.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114961956A (en) * | 2022-07-06 | 2022-08-30 | 潍柴动力股份有限公司 | Method and device for diagnosing conversion efficiency of selective catalytic reduction |
| CN114961956B (en) * | 2022-07-06 | 2023-12-15 | 潍柴动力股份有限公司 | Selective catalytic reduction conversion efficiency diagnosis method and device |
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