CN113803134A - Aging correction method for selective catalytic reduction reactor - Google Patents
Aging correction method for selective catalytic reduction reactor Download PDFInfo
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- CN113803134A CN113803134A CN202010528251.2A CN202010528251A CN113803134A CN 113803134 A CN113803134 A CN 113803134A CN 202010528251 A CN202010528251 A CN 202010528251A CN 113803134 A CN113803134 A CN 113803134A
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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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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- 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
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention aims to provide an aging correction method of a selective catalytic reduction device, which does not need complex calibration, collects the data related to the conversion efficiency of the catalyst at certain intervals in the using process of an engine and the catalyst, calculates an aging correction coefficient and corrects the urea injection amount of the selective catalytic reduction reactor; the method comprises the following steps: s1: acquiring a dew point release state and an effective state of the NOx sensor through the NOx sensor message, and S2: when the engine runs to a proper engine speed and load working point and the engine is in a steady state working condition, acquiring aging related data; the invention has the beneficial effects that: (1) before the selective catalytic reduction reactor is used, complex and tedious aging calibration is not needed. (2) In the use process, under a proper operation environment, the aging correction coefficient can be calculated by injecting according to a preset urea injection mode, and the method is simple and high in efficiency.
Description
Technical Field
The invention relates to the technical field of automobile equipment, in particular to an aging correction method of a selective catalytic reduction reactor.
Background
With the increasing upgrading of emission regulations, diesel engines can only meet stringent emission regulations with exhaust gas after-treatment devices, such as selective catalytic reduction reactors SCR. The after-treatment device is installed in an exhaust pipe of a diesel engine, the use condition is deteriorated, and a catalyst coating layer in the exhaust after-treatment device is easily aged under the action of high temperature, resulting in the reduction of the conversion efficiency of the exhaust gas purification device and even the deterioration of emission.
Due to the fact that the aging mechanism is complex and has a great relation with impurities contained in fuel oil, emission of an engine, driving characteristics of a driver and characteristics of a catalyst, calibration of aging is complex and time-consuming, and the aging condition of each trolley in actual use is different.
At present, in the use process, the aging condition of the selective catalytic reduction reactor is not considered or is simply calculated according to the working condition and the running time of an engine, and the influence of the characteristics of each engine and each catalyst on the selective catalytic reduction reaction cannot be reflected.
Disclosure of Invention
The invention aims to provide an aging correction method of a selective catalytic reduction device, which does not need complicated calibration, collects data related to the conversion efficiency of the catalyst at regular intervals in the using process of an engine and the catalyst, calculates an aging correction coefficient and corrects the urea injection amount of the selective catalytic reduction reactor.
The invention provides an aging correction method of a selective catalytic reduction reactor,
the method comprises the following steps:
s1: and acquiring a dew point release state and an effective state of the NOx sensor through the NOx sensor message, and ensuring that the acquired NOx concentration values before and after the SCR are accurate and effective.
S2: when the engine runs to a proper engine speed and load working point and the engine is in a steady working condition, the aging related data is collected.
S3: by ceasing urea injection, the effect of storing NH3 in the SCR is reduced.
S4: and carrying out open-loop injection on the urea aqueous solution according to the ammonia nitrogen ratio of 1: 1.
S5: in the open-loop injection process, NOx concentration values before and after SCR are collected and are respectively accumulated and summed to obtain NOx concentration accumulated values NOx1 and NOx2 before and after SCR.
S6: and acquiring the conversion efficiency eta 1 of the current SCR according to the integrated value of the NOx concentration before and after the SCR.
S7: and obtaining an aging factor psi of the SCR according to the conversion efficiency of the current SCR and the new conversion efficiency eta 0 of the non-aged SCR.
The invention has the beneficial effects that: (1) before the selective catalytic reduction reactor is used, complex and tedious aging calibration is not needed. (2) In the use process, under a proper operation environment, the aging correction coefficient can be calculated by injecting according to a preset urea injection mode, and the method is simple and high in efficiency. (3) The aging correction coefficient adopts a self-adaptive mode, and the urea injection quantity can be corrected according to the actual aging condition of each selective catalytic reduction reactor.
Drawings
FIG. 1 is a schematic diagram of the algorithm flow of the present invention.
Detailed Description
The present invention will now be described in detail with reference to the drawings, which are given by way of illustration and explanation only and should not be construed to limit the scope of the present invention in any way.
Under a proper and stable engine working condition, a fixed amount of urea aqueous solution is injected, and NOx concentration values before and after the selective catalytic reduction reactor are collected. Based on the current NOx conversion efficiency and the NOx conversion efficiency of the new catalyst, the aging factor for the selective catalytic reduction reactor may be calculated.
The invention provides an aging correction method of a selective catalytic reduction reactor,
the method comprises the following steps:
s1: and acquiring a dew point release state and an effective state of the NOx sensor through the NOx sensor message, and ensuring that the acquired NOx concentration values before and after the SCR are accurate and effective.
S2: when the engine runs to a proper engine speed and load working point and the engine is in a steady working condition, the aging related data is collected.
S3: by ceasing urea injection, the effect of storing NH3 in the SCR is reduced.
S4: and carrying out open-loop injection on the urea aqueous solution according to the ammonia nitrogen ratio of 1: 1.
S5: in the open-loop injection process, NOx concentration values before and after SCR are collected and are respectively accumulated and summed to obtain NOx concentration accumulated values NOx1 and NOx2 before and after SCR.
S6: and acquiring the conversion efficiency eta 1 of the current SCR according to the integrated value of the NOx concentration before and after the SCR.
S7: and obtaining an aging factor psi of the SCR according to the conversion efficiency of the current SCR and the new conversion efficiency eta 0 of the non-aged SCR.
The greater the aging factor ψ, the more severe the aging degree of the SCR.
Under a proper and stable engine working condition, a fixed amount of urea aqueous solution is injected, and NOx concentration values before and after the selective catalytic reduction reactor are collected. Based on the current NOx conversion efficiency and the NOx conversion efficiency of the new catalyst, the aging factor for the selective catalytic reduction reactor may be calculated.
It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (1)
1. An aging correction method of a selective catalytic reduction reactor,
the method comprises the following steps:
s1: acquiring a dew point release state and an effective state of the NOx sensor through the NOx sensor message, and ensuring that the collected NOx concentration values before and after the SCR are accurate and effective;
s2: when the engine runs to a proper engine speed and load working point and the engine is in a steady state working condition, acquiring aging related data;
s3: by stopping urea injection, the influence of NH3 storage in the SCR is reduced;
s4: carrying out open-loop injection on the urea aqueous solution according to the ammonia nitrogen ratio of 1: 1;
s5: in the open-loop injection process, NOx concentration values before and after SCR are collected and are respectively accumulated and summed to obtain NOx concentration accumulated values NOx1 and NOx2 before and after SCR;
s6: acquiring the conversion efficiency eta 1 of the current SCR according to the integrated values of the NOx concentrations before and after the SCR;
s7: and obtaining an aging factor psi of the SCR according to the conversion efficiency of the current SCR and the new conversion efficiency eta 0 of the non-aged SCR.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010528251.2A CN113803134A (en) | 2020-06-11 | 2020-06-11 | Aging correction method for selective catalytic reduction reactor |
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| CN202010528251.2A CN113803134A (en) | 2020-06-11 | 2020-06-11 | Aging correction method for selective catalytic reduction reactor |
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| CN113803134A true CN113803134A (en) | 2021-12-17 |
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| CN202010528251.2A Pending CN113803134A (en) | 2020-06-11 | 2020-06-11 | Aging correction method for selective catalytic reduction reactor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075917A (en) * | 2022-06-30 | 2022-09-20 | 广西玉柴机器股份有限公司 | Test method and verification method for SCR closed-loop calibration of non-road diesel engine |
Citations (7)
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|---|---|---|---|---|
| CN102168600A (en) * | 2010-01-29 | 2011-08-31 | 罗伯特·博世有限公司 | Method and device for determining exhaust gas temperature in exhaust gas channel |
| CN103277177A (en) * | 2013-06-19 | 2013-09-04 | 潍柴动力股份有限公司 | Correction method, device and system for aging of selective catalytic reduction (SCR) |
| CN104234802A (en) * | 2014-07-14 | 2014-12-24 | 浙江大学 | SCR (Selective Catalytic Reduction) catalyst aging judgment method based on NOx feedback and ammonia storage prediction |
| CN106837488A (en) * | 2017-01-06 | 2017-06-13 | 无锡威孚力达催化净化器有限责任公司 | SCR feedforward control computational methods |
| CN108952901A (en) * | 2018-07-04 | 2018-12-07 | 中国汽车技术研究中心有限公司 | SCR catalyst aging modification method based on double NOx sensors |
| CN209385211U (en) * | 2018-12-18 | 2019-09-13 | 东风商用车有限公司 | Equipment for accurately measuring dew point temperature of NOx sensor |
| CN111157049A (en) * | 2020-01-13 | 2020-05-15 | 北京理工大学 | System and method for rapidly evaluating aging performance of SCR (selective catalytic reduction) postprocessor of diesel vehicle |
-
2020
- 2020-06-11 CN CN202010528251.2A patent/CN113803134A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102168600A (en) * | 2010-01-29 | 2011-08-31 | 罗伯特·博世有限公司 | Method and device for determining exhaust gas temperature in exhaust gas channel |
| CN103277177A (en) * | 2013-06-19 | 2013-09-04 | 潍柴动力股份有限公司 | Correction method, device and system for aging of selective catalytic reduction (SCR) |
| CN104234802A (en) * | 2014-07-14 | 2014-12-24 | 浙江大学 | SCR (Selective Catalytic Reduction) catalyst aging judgment method based on NOx feedback and ammonia storage prediction |
| CN106837488A (en) * | 2017-01-06 | 2017-06-13 | 无锡威孚力达催化净化器有限责任公司 | SCR feedforward control computational methods |
| CN108952901A (en) * | 2018-07-04 | 2018-12-07 | 中国汽车技术研究中心有限公司 | SCR catalyst aging modification method based on double NOx sensors |
| CN209385211U (en) * | 2018-12-18 | 2019-09-13 | 东风商用车有限公司 | Equipment for accurately measuring dew point temperature of NOx sensor |
| CN111157049A (en) * | 2020-01-13 | 2020-05-15 | 北京理工大学 | System and method for rapidly evaluating aging performance of SCR (selective catalytic reduction) postprocessor of diesel vehicle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075917A (en) * | 2022-06-30 | 2022-09-20 | 广西玉柴机器股份有限公司 | Test method and verification method for SCR closed-loop calibration of non-road diesel engine |
| CN115075917B (en) * | 2022-06-30 | 2023-08-25 | 广西玉柴机器股份有限公司 | Test method and verification method for SCR closed loop calibration of off-road diesel engine |
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